CN213628231U

CN213628231U - Solar photo-thermal tracking hydraulic driving system

Info

Publication number: CN213628231U
Application number: CN202022604546.1U
Authority: CN
Inventors: 葛志伟; 马琛俊; 张晓伟
Original assignee: Shanghai Electric Hydraulics and Pneumatics Co Ltd
Current assignee: Shanghai Electric Hydraulics and Pneumatics Co Ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-07-06
Anticipated expiration: 2030-11-11

Abstract

The utility model discloses a solar photothermal tracking hydraulic drive system, the oil tank comprises an oil tank, left side of oil tank and pneumatic cylinder, respectively be equipped with one between the two chambeies of right side and supply back the oil circuit, each supplies back the oil circuit all including consecutive gear pump of taking servo motor, a one-way relief valve, two three-way reversing valve of liquid accuse, the entry and the oil tank of gear pump link to each other, the export of two three-way reversing valve of liquid accuse corresponds a chamber with the pneumatic cylinder and links to each other, two three-way reversing valve of liquid accuse still has a hydraulic fluid outlet, link to each other with the oil tank, each supplies back the two three-way reversing valve of liquid accuse of oil circuit to advance, outlet pressure difference is used for the antithet. The hydraulic driving system has the advantages of simplifying oil paths, reducing volume, electrically driving, improving overall efficiency, facilitating maintenance and the like.

Description

Solar photo-thermal tracking hydraulic driving system

Technical Field

The utility model belongs to solar photothermal power technology, concretely relates to solar photothermal tracking hydraulic drive system.

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, and extremely small in maintenance due to self-locking capacity, 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a solar photothermal tracking hydraulic drive system is provided, can utilize two pumps to act on two chambeies of single pneumatic cylinder respectively, the process is simplified and is improved the efficiency, the control of being convenient for.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a solar photothermal tracking hydraulic drive system, including the oil tank, respectively be equipped with one between oil tank and the pneumatic cylinder left and right two chambeies and supply back the oil circuit, each supplies back the oil circuit all including consecutive gear pump of taking servo motor, a one-way relief valve, the two-position three way reversing valve of liquid accuse, the entry and the oil tank of gear pump link to each other, the export of two-position three way reversing valve of liquid accuse links to each other with a chamber that the pneumatic cylinder corresponds, two-position three way reversing valve of liquid accuse still has a hydraulic fluid outlet, link to each other with the oil tank, each supplies the two-position three way reversing valve of liquid accuse of back the oil circuit to advance, outlet pressure differential is used.

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.

Adopt the utility model discloses a solar photothermal tracking hydraulic drive system compares with prior art, has following advantage:

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. And the utility model discloses a hydraulic control principle is very simplified, and does not use a large amount of valve blocks, when effectively reducing the maintenance cost, has improved the efficiency of system greatly.

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. And the utility model discloses regard the pneumatic cylinder as the power supply of system, utilize two gear pumps to act on two chambeies of single pneumatic cylinder respectively (pump accuse promptly), the process is simplified and is improved the efficiency, the control of being convenient for.

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. And the utility model discloses a pneumatic cylinder of two gear pump control, two pneumatic cylinders are independent control like this, do not receive the interference mutually, improve system security and stability.

Drawings

The following detailed description of the present invention is made with reference to the accompanying drawings and the embodiments:

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 diagram of the solar photo-thermal tracking hydraulic driving system of the present invention.

Fig. 4 is a schematic diagram of the use of the hydraulic drive system of the present invention.

Detailed Description

The utility model discloses a solar photothermal tracking hydraulic drive system 10 is as shown in fig. 3, including an oil tank 11, oil tank 11 and pneumatic cylinder 3 a left side, respectively be equipped with one between the two chambeies in the right side and supply back the oil circuit, this a left side, two confession back oil circuits in the right side are also the same, each supplies back the oil circuit all including consecutive taking servo motor 12's gear pump 13, a one-way relief valve 14, hydraulic control two-position three-way reversing valve 15, wherein, the entry and the oil tank 11 of gear pump 13 link to each other, hydraulic control two-position three-way reversing valve 15's export links to each other with a chamber that pneumatic cylinder 3 corresponds, hydraulic control two-position three-way reversing valve 15 still has an oil return opening, link to each with oil tank 11, each supplies the hydraulic control two-position three-way reversing valve 15 of oil circuit to advance, the pressure difference of export. The hydraulic control of the hydraulic control two-position three-way reversing valve has the function of automatically controlling the interior by utilizing the pressure of each point formed in an oil way without intervention of external data.

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 inlet pressure and the outlet pressure of the hydraulic control two-position three-way reversing valve 15 are obtained and compared (through the throttle valve 19), and the passage way of the hydraulic control two-position three-way reversing valve 15 on the right side is changed according to the comparison result, namely oil is discharged, so that 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, the action of the hydraulic rod of the hydraulic cylinder 3 moving 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 the right.

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 utility model discloses a hydraulic drive system 10 be a compact electricity liquid Executor (EHA), in the in-service use, can be with its application in solar energy tracking mechanism with the traditional hydraulic drive's of replacement slot type solar drive 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 controlled integrally by using the valve control technology, is replaced by a new system shown in fig. 3, in which two pumps control a single hydraulic cylinder 3, the two hydraulic cylinders 3 are controlled independently, and the two hydraulic cylinders are controlled by using the pump control technology, that is, as shown in fig. 4. 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 corresponding 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. 3, 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.

To sum up, the utility model discloses a solar photothermal tracking hydraulic drive system changes the valve accuse into the pump accuse, has the simplification oil circuit, reduces the volume, automatically controlled electricity drives, improves whole efficiency, a great deal of advantages such as be convenient for maintain.

However, those skilled in the art should realize that the above embodiments are only used for illustrating the present invention and not used as a limitation of the present invention, and that the changes and modifications to the above embodiments are within the scope of the appended claims as long as they are within the true spirit of the present invention.

Claims

1. The utility model provides a solar photothermal tracking hydraulic drive system which characterized in that: including the oil tank, the oil tank and the pneumatic cylinder are left, respectively be equipped with one between the two chambeies in the right side and supply the oil return way, each supplies the oil return way all to include consecutive gear pump of taking servo motor, a one-way relief valve, the two-position three-way switching-over valve of liquid accuse, the entry and the oil tank of gear pump link to each other, the export of the two-position three-way switching-over valve of liquid accuse links to each other with a chamber that the pneumatic cylinder corresponds, two-position three-way switching-over valve of liquid accuse still has an oil return mouth, link to each other with the oil tank, each supplies the two-position three-way switching-over valve.

2. The solar photo-thermal tracking hydraulic drive system 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 solar photo-thermal tracking hydraulic drive system 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.