CN112283961A - Double-pump joint control solar photo-thermal tracking device - Google Patents
Double-pump joint control solar photo-thermal tracking device Download PDFInfo
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- CN112283961A CN112283961A CN202011255597.6A CN202011255597A CN112283961A CN 112283961 A CN112283961 A CN 112283961A CN 202011255597 A CN202011255597 A CN 202011255597A CN 112283961 A CN112283961 A CN 112283961A
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- hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/20—Arrangements for controlling solar heat collectors for tracking
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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
- F15B11/22—Synchronisation of the movement of two or more servomotors
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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
- F15B13/024—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
- 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
- F15B13/027—Check 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
- 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
-
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31594—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and multiple output members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
- F24S2030/10—Special components
- F24S2030/11—Driving means
- F24S2030/115—Linear actuators, e.g. pneumatic cylinders
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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
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a double-pump joint control solar photothermal tracking device which comprises a condenser, a pair of transmission plates and a pair of hydraulic cylinders, wherein each hydraulic cylinder is provided with a hydraulic driving system, each hydraulic driving system comprises an oil tank and two oil supply return paths respectively connected with the oil tank and a left cavity and a right cavity of the hydraulic cylinder, each oil supply return path comprises a gear pump with a servo motor, a first one-way safety valve and a hydraulic control two-position three-way reversing valve which are sequentially connected, an inlet of the gear pump is connected with the oil tank, an outlet of the hydraulic control two-position three-way reversing valve is connected with a corresponding cavity of the hydraulic cylinder, the hydraulic control two-position three-way reversing valve is also provided with an oil return port which is connected with the oil tank, and the pressure difference of an inlet and an outlet of the hydraulic control two-position three-way reversing valve of. The tracking device has the advantages of simplifying an oil way, reducing the volume, electrically controlling the electric drive, improving the overall efficiency, facilitating the maintenance and the like.
Description
Technical Field
The invention belongs to the solar photo-thermal power generation technology, and particularly relates to a double-pump joint control solar photo-thermal tracking device.
Background
The trough type solar photo-thermal power generation system comprises a reflector, a heat collector, a torque tube, a middle support, a tail end support, a heat collector driving system and a supporting arm. The heat collector is driven to be a hydraulic driving unit and provided with two hydraulic cylinders, the supporting movable arm is driven in an expected direction, and the heat collector is driven to track the sun from the sunrise to the sunset.
At present, hydraulic transmission is applied to a large-scale solar panel for a solar tracker. For a transmission system, the design key points are that the transmission system is small in size, light in weight, large in output torque, low in rotating speed, high in precision, good in sealing performance, self-locking and few in maintenance, and has enough strength and rigidity. The current design scheme is that the valve control is used as a means, and a large number of overflow valves, throttle valves and reversing valves in the system are used for controlling the actuation of the oil cylinder to complete the rotation of the solar tracker.
As shown in fig. 1, two hydraulic cylinders 3 drive respective transmission plates 2 to drive a condenser 1 to rotate, where 4 and 5 in fig. 1 are a base and a rotation center, respectively. The hydraulic control principle of the tracking system is shown in fig. 2, and as can be seen from fig. 2, the hydraulic control loop of the existing hydraulically-driven groove type solar tracking mechanism is complex and is a complex system comprising a large-power pump 6, an overflow valve 7, a reversing valve 8 and other elements. This results in a loss of flow between the lines during operation and a high energy consumption. Meanwhile, the hydraulic pump operates for many times in a short time, and the temperature rise of the working environment can cause the viscosity of hydraulic oil to be reduced and the leakage amount to be increased, so that the volumetric efficiency of the hydraulic pump and the overall efficiency of the system are obviously reduced. In addition, the complex system causes the failure probability to rise, the maintenance cost of each component rises, and the working efficiency of the solar panel is directly influenced.
In addition, the system uses a single hydraulic pump as a power source, adopts the technical means of valve control, controls the reversing of the hydraulic cylinder by a plurality of reversing valves, and has lower flexibility and smaller application range.
In addition, only four hydraulic control valves and eight electric control valves can be used on a single hydraulic cylinder loop, the number of electric control elements is large, the maintenance cost is high, and the flow loss is large.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-pump joint control solar photo-thermal tracking device which can respectively act on two cavities of a single hydraulic cylinder by utilizing two pumps, simplifies the process, improves the energy efficiency and is convenient to control.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a double pump allies oneself with accuse solar photothermal tracking device, including the spotlight ware, a pair of driving plate and a pair of pneumatic cylinder, two pneumatic cylinders link to each other with the spotlight ware through the driving plate that corresponds respectively, every pneumatic cylinder all has a hydraulic drive system, every hydraulic drive system all includes the oil tank, connect respectively oil tank and pneumatic cylinder left and right two confession oil return paths in two chambeies, each confession oil return path all includes the consecutive gear pump of taking servo motor, a one-way relief valve, the two three-way switching-over valve of liquid accuse, the entry of gear pump links to each other with the oil tank, the export of the two-way three-way switching-over valve of liquid accuse corresponds a chamber with the pneumatic cylinder and links to each other, the two-way three-way switching-over valve of liquid accuse still has an oil return opening, link to each confession oil return path's two-way three-.
Each hydraulic driving system also comprises a protection oil path which comprises a pair of second one-way safety valves and an overflow valve, the inlets of the two second one-way safety valves are respectively connected between the first one-way safety valve of the two oil supply and return paths and the hydraulic control two-position three-way reversing valve, and the outlets are connected to the oil tank through the overflow valve.
Each hydraulic driving system also comprises a hydraulic cylinder safety oil circuit which comprises a pair of third one-way safety valves, inlets of the two third one-way safety valves are respectively connected to a cavity corresponding to the hydraulic cylinder, and outlets of the two third one-way safety valves are connected to an oil tank through overflow valves.
Compared with the prior art, the double-pump joint control solar photo-thermal tracking device has the following advantages:
1. the hydraulic control principle in the prior art is complex, and a large amount of reversing valves, throttle valves, overflow valves and the like are used, so that the system efficiency is low, and the cost is low. The hydraulic control principle of the invention is greatly simplified, and a large number of valve blocks are not used, so that the maintenance cost is effectively reduced, and the efficiency of the system is greatly improved.
2. In the prior art, a single hydraulic pump is used as a power source of a system, actions (namely valve control) of two cavities of a single hydraulic cylinder are completed by utilizing different valve blocks, the process is complex, and the energy consumption is large. The hydraulic cylinder is used as a power source of the system, and the two gear pumps are used for respectively acting on the two cavities of the single hydraulic cylinder (namely pump control), so that the process is simplified, the energy efficiency is improved, and the control is convenient.
3. The two hydraulic cylinders are controlled in the prior art and are arranged in an integral system, and once a certain valve in the middle fails, the integral system cannot be actuated. The invention adopts two gear pumps to control one hydraulic cylinder, so that the two hydraulic cylinders are independently controlled and are not interfered with each other, and the safety and the stability of the system are improved.
Drawings
The invention is described in detail below with reference to the following figures and detailed description:
fig. 1 is a schematic structural diagram of a hydraulic drive trough solar tracking system of the prior art.
Fig. 2 is a hydraulic control schematic of a prior art tracking system.
Fig. 3 is a schematic structural diagram of the dual-pump joint control solar photo-thermal tracking device of the invention.
Fig. 4 is a schematic diagram of a single hydraulic drive system of the tracking device of the present invention.
Detailed Description
The double-pump combined control solar photo-thermal tracking device of the invention is shown in figure 3, and also comprises a condenser 1, a pair of transmission plates 2 and a pair of hydraulic cylinders 3, wherein the two hydraulic cylinders 3 are respectively connected with the condenser 1 through the corresponding transmission plates 2, the difference is that each hydraulic cylinder 3 is provided with a set of same hydraulic driving system 10, as shown in figure 4, each set of hydraulic driving system 10 comprises an oil tank 11 and two oil supply and return paths respectively connected with the oil tank 11 and the left and right cavities of the hydraulic cylinder 3, the left and right oil supply and return paths are also same, each oil supply and return path comprises a gear pump 13 with a servo motor 12, a first one-way safety valve 14 and a hydraulic control two-position three-way reversing valve 15 which are sequentially connected, wherein the inlet of the gear pump 13 is connected with the oil tank 11, the outlet of the hydraulic control two-position three-way reversing valve 15 is connected with a cavity corresponding to the hydraulic cylinder 3, the hydraulic control two-position three, the pressure difference between the inlet pressure and the outlet pressure (through the throttle valve 19) of the hydraulic control two-position three-way reversing valve 15 of each oil supply and return path is used for joint control of the hydraulic control two-position three-way reversing valve 15 of the other oil supply and return path, and the hydraulic control of the hydraulic control two-position three-way reversing valve has the function of utilizing the pressure of each point formed in the oil path to carry out internal automatic control without external data intervention.
As an embodiment, each hydraulic drive system 10 further includes a protection oil path, which includes a pair of second one-way relief valves 16 and a relief valve 17, wherein inlets of the second one-way relief valves 16 are respectively connected between the first one-way relief valve 14 of the two oil supply and return paths and the pilot-controlled two-position three-way directional valve 15, and outlets of the second one-way relief valves are connected to the oil tank 11 through the relief valve 17.
As another embodiment, each hydraulic drive system 10 further includes a cylinder relief circuit including a pair of third one-way relief valves 18, wherein inlets of the third one-way relief valves 18 are connected to a corresponding chamber of the hydraulic cylinder 3, and outlets of the third one-way relief valves 18 are connected to the oil tank 11 through a relief valve 17.
The control principle of the hydraulic drive system 10 is as follows: taking the left oil supply and return path as an example, the servo motor 12 rotates at a high speed to drive the gear pump 13 to suck oil out of the oil tank 11, and the oil enters the hydraulic control two-position three-way directional valve 15 through the one-way safety valve when reaching a set pressure, and then enters the left cavity of the hydraulic cylinder 3 to push the piston to move rightwards, and the oil is discharged from the right cavity. Meanwhile, the pressure difference between the inlet and the outlet of the hydraulic control two-position three-way reversing valve 15 is obtained, the passage way of the hydraulic control two-position three-way reversing valve 15 on the right side is changed according to the pressure difference, namely oil is discharged, the oil directly flows back to the oil tank 11 through the oil return port of the hydraulic control two-position three-way reversing valve 15 on the right side after being discharged from the right cavity of the hydraulic cylinder 3, so that the action that the hydraulic rod of the hydraulic cylinder 3 acts from left to right is finished, the servo motor 12 on the right side rotates at a low speed or stops rotating in the process, and the outlet pressure of the gear pump 13 on.
If the motor is operated in the reverse direction, the servo motor 12 on the right side rotates at a high speed, and the servo motor 12 on the left side rotates at a low speed or stops. The whole control process shows that the hydraulic cylinder 3 can be controlled to act by controlling the rotating speed of the gear pumps 13 on the left side and the right side, namely the pump control technology.
The hydraulic drive system 10 employed in the present invention, a compact electro-hydraulic actuator (EHA), is utilized in a conventional hydraulically driven trough solar drive mechanism as a replacement for a solar tracking mechanism. Namely, the system shown in fig. 2, in which two pumps control two hydraulic cylinders 3 in the conventional hydraulic drive, and the two hydraulic cylinders 3 are integrally controlled by using the valve control technology, is replaced by a new system shown in fig. 4, in which two pumps control a single hydraulic cylinder 3, the two hydraulic cylinders 3 are independently controlled, and the two hydraulic cylinders are controlled by using the pump control technology. Therefore, the three advantages of simplifying an oil way, reducing the volume and electrically controlling the electric drive can be achieved. The hydraulic cylinder 3 is used as a power source in the design, so that energy efficiency can be improved, and maintenance is facilitated. And by adopting the technical means of pump control, two gear pumps 13 are used for respectively driving the two cavities of the hydraulic cylinder 3 to form independent driving of the two cavities, so that the rotating speed of the mechanism can be conveniently adjusted by adjusting the oil inlet amount of the two cavities, and the flexibility of the system is greatly improved. Compared with the traditional scheme, the oil circuit utilizing the EHA scheme is greatly simplified, the flow loss of an overflow valve, a throttle valve and the like in a loop is reduced, the pipeline leakage caused by temperature rise is avoided, and the efficiency and the stability of the system are improved. As is also apparent from fig. 4, 11 pilot-controlled valves (7 of which are safety valves) are used in the circuit of a single hydraulic cylinder 3, and the system is simplified by removing the pilot-controlled valves, and a control terminal point is placed on one side of the gear pump 13, so that a pump control technology is formed.
In conclusion, the double-pump combined control solar photo-thermal tracking device provided by the invention changes valve control into pump control, and has the advantages of simplifying an oil path, reducing the volume, electrically controlling electric drive, improving the overall efficiency, facilitating maintenance and the like.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (3)
1. The utility model provides a double pump allies oneself with accuse solar photothermal tracking device which characterized in that: including the spotlight ware, a pair of driving plate and a pair of pneumatic cylinder, two pneumatic cylinders link to each other with the spotlight ware through the driving plate that corresponds respectively, every pneumatic cylinder all has a hydraulic drive system, every hydraulic drive system all includes the oil tank, connect oil tank and pneumatic cylinder left and right two confession oil return paths in two chambeies respectively, each confession oil return path all includes consecutive gear pump of taking servo motor, a one-way relief valve, the hydraulic control two-position three-way reversing valve, the entry and the oil tank of gear pump link to each other, the export of hydraulic control two-position three-way reversing valve links to each other with a pneumatic cylinder correspondence chamber, the hydraulic control two-position three-way reversing valve still has an oil return opening, link to each other with the oil tank, each confession oil return path's hydraulic control two-position three-way reversing valve advances, the export pressure differential.
2. The dual-pump joint control solar photo-thermal tracking device according to claim 1, characterized in that: each hydraulic driving system also comprises a protection oil path which comprises a pair of second one-way safety valves and an overflow valve, the inlets of the two second one-way safety valves are respectively connected between the first one-way safety valve of the two oil supply and return paths and the hydraulic control two-position three-way reversing valve, and the outlets are connected to the oil tank through the overflow valve.
3. The dual-pump joint control solar photo-thermal tracking device according to claim 2, characterized in that: each hydraulic driving system also comprises a hydraulic cylinder safety oil circuit which comprises a pair of third one-way safety valves, inlets of the two third one-way safety valves are respectively connected to a cavity corresponding to the hydraulic cylinder, and outlets of the two third one-way safety valves are connected to an oil tank through overflow valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011255597.6A CN112283961B (en) | 2020-11-11 | 2020-11-11 | Double-pump joint control solar photo-thermal tracking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011255597.6A CN112283961B (en) | 2020-11-11 | 2020-11-11 | Double-pump joint control solar photo-thermal tracking device |
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| Publication Number | Publication Date |
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| CN112283961A true CN112283961A (en) | 2021-01-29 |
| CN112283961B CN112283961B (en) | 2022-06-21 |
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| CN202011255597.6A Active CN112283961B (en) | 2020-11-11 | 2020-11-11 | Double-pump joint control solar photo-thermal tracking device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110202232A1 (en) * | 2007-10-11 | 2011-08-18 | Jochen Busch | Hydraulic Lift System And Control Method |
| CN103787243A (en) * | 2012-11-04 | 2014-05-14 | 西安志越机电科技有限公司 | Hydraulic circuit for aerial work vehicle operating arm telescoping devices |
| CN104089078A (en) * | 2014-07-16 | 2014-10-08 | 上海豪高机电科技有限公司 | Proportional control device used for linear-stroke valve |
| CN105090135A (en) * | 2015-08-28 | 2015-11-25 | 苏州斯卡柏通讯技术有限公司 | Hydraulic driving system for solar condenser |
| CN106286453A (en) * | 2016-10-13 | 2017-01-04 | 佛山市三水宏源陶瓷企业有限公司 | The double pressure system of ceramic brick press constant pressure variable displacement pump |
| CN109237824A (en) * | 2017-05-26 | 2019-01-18 | 天津滨海光热跟踪技术有限公司 | A kind of trough type solar heat-collector fluid power system |
-
2020
- 2020-11-11 CN CN202011255597.6A patent/CN112283961B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110202232A1 (en) * | 2007-10-11 | 2011-08-18 | Jochen Busch | Hydraulic Lift System And Control Method |
| CN103787243A (en) * | 2012-11-04 | 2014-05-14 | 西安志越机电科技有限公司 | Hydraulic circuit for aerial work vehicle operating arm telescoping devices |
| CN104089078A (en) * | 2014-07-16 | 2014-10-08 | 上海豪高机电科技有限公司 | Proportional control device used for linear-stroke valve |
| CN105090135A (en) * | 2015-08-28 | 2015-11-25 | 苏州斯卡柏通讯技术有限公司 | Hydraulic driving system for solar condenser |
| CN106286453A (en) * | 2016-10-13 | 2017-01-04 | 佛山市三水宏源陶瓷企业有限公司 | The double pressure system of ceramic brick press constant pressure variable displacement pump |
| CN109237824A (en) * | 2017-05-26 | 2019-01-18 | 天津滨海光热跟踪技术有限公司 | A kind of trough type solar heat-collector fluid power system |
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| CN112283961B (en) | 2022-06-21 |
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