WO2020215482A1

WO2020215482A1 - Resilient mounting photovoltaic tracking bracket having self-locking function

Info

Publication number: WO2020215482A1
Application number: PCT/CN2019/093418
Authority: WO
Inventors: 楼振越
Original assignee: 上海能耀新能源科技有限公司
Priority date: 2019-04-25
Filing date: 2019-06-28
Publication date: 2020-10-29
Also published as: CN110209206A

Abstract

Disclosed is a resilient mounting photovoltaic tracking bracket having self-locking function, comprising a photovoltaic module support frame for fixing the photovoltaic module, a column (2) for supporting the photovoltaic module support frame, a transfer unit mounted on the column (2), and a drive unit for driving the transfer unit to work. The transfer unit comprises a wire rope (4), a cable clamp, a differential motion spiral wheel (3) and a transmission case (5); the drive unit comprises a drive shaft (6) and a drive and control device (7); and a self-locking structure is provided between the drive shaft (6) and the transmission case (5). Multipoint synergy drive is used to ensure even drive load on the tracking bracket, which greatly reduces the overall torsional deformation of the structure, and thereby guaranteeing the tracking precision of the tracking support and the generating efficiency of the photovoltaic module. Multipoint valid support is used to effectively reduce the vibration response of the structure under wind loading, which improves the safe reliability of the tracking support. Meanwhile, the self-locking at each drive node effectively improve the integral rigidity of the bracket structure as well as the stability and reliability of the structure lock-up.

Description

Flexible supporting photovoltaic tracking bracket with self-locking function

Technical field

The invention relates to the technical field of photovoltaic solar power generation applications, in particular to a flexible supporting photovoltaic tracking bracket with a self-locking function.

Background technique

The solar automatic tracker can help solar photovoltaic or photothermal devices (such as photovoltaic panels, etc.) to better receive sunlight to improve power generation efficiency, thereby reducing power generation costs.

With the continuous growth of the proportion of photovoltaic power generation and the large number of engineering applications of solar tracking brackets, higher requirements are put forward for the safety and reliability of the tracking brackets themselves. One of the most important features of any type of solar photovoltaic stent design is that the structure must be firm and reliable, safe and reliable installation, and able to withstand atmospheric erosion, wind loads and other external effects. In addition, in order to further reduce the cost of photovoltaic power generation, it is imperative to reduce the material consumption of the photovoltaic support itself. Achieve the maximum use effect with the minimum installation cost, almost maintenance-free, reliable maintenance, these are important factors that need to be considered when making a selection plan. Therefore, it is particularly important to ensure the reliability of the tracking bracket transmission and the safety and stability of the support while reducing the amount of steel used.

In the existing tracking bracket, the supporting column is fixed to the construction pile foundation, and the linear drive or rotary drive is used to drive the photovoltaic module to rotate around the rotation axis of the column near the middle column or the middle column, and the sun track is realized through the driver, controller and control algorithm. Real-time tracking, that is, keep the photovoltaic modules aligned with the direction of the sun at all times to achieve the purpose of increasing power generation. However, this method has many shortcomings, mainly in the following aspects:

1) The overall torsional deformation of the support structure affects the tracking accuracy, resulting in a decrease in power generation: Since the length of the overall support structure reaches more than 18 meters, when the linear or rotary driver drives the assembly plate to rotate around the axis, due to the existence of local elastic deformation of the structure, the driving torque It cannot act evenly on the overall structure, so that the drive rotation angle cannot be accurately transmitted to the two ends of the support structure. At this time, the entire support structure is twisted and deformed, so that the photovoltaic modules cannot be accurately aligned with the incident direction of the sun's rays, which affects the power generation of the photovoltaic modules.

2) Lack of rigid support at the columns at both ends of the bracket: under the action of wind load, due to the influence of wind vibration effect, large amplitude torsional vibration will be generated at both ends of each unit row, in order to reduce the structure caused by wind vibration effect Torsional vibration requires dampers to be installed at the two end columns of the support structure. The introduction of the damper increases the overall cost of the tracking bracket on the one hand, and on the other hand increases the complexity of the construction and installation process. In addition, the damper itself has a risk of failure and requires regular maintenance. From a functional point of view, the damper only responds to the dynamic speed changes of the structure, and cannot effectively support the slow-varying load.

3) The self-locking position is single, which has extremely high requirements on the strength of the locking structure and related installation structural parts: In this type of bracket, the self-locking function of the tracking bracket is realized by the driver or the corresponding reducer. Under the action of extreme high winds, huge stress loads will be generated on the only component that provides the self-locking function. In order to ensure the safety and stability of the structure, the support structure needs to be strengthened, which will inevitably increase the cost of the support to ensure the self-locking and safety of the tracking support stability. In addition, since the tracking bracket is only self-locking in one place, most areas cannot be completely locked in position, which will greatly increase the overall safety and reliability risk of the tracking bracket under extreme weather conditions.

Summary of the invention

In order to solve the above-mentioned problems, the purpose of the present invention is to provide a new type of flexible support photovoltaic tracking support that can be driven by multi-points coordinated, multi-point effective support and multi-point position self-locking.

The present invention provides a flexible supporting photovoltaic tracking bracket with self-locking function, including:

The photovoltaic module support frame includes a plurality of photovoltaic module support beams, and the photovoltaic module is fixedly installed on the photovoltaic module support beam;

A column, the lower end of which is fixed on the ground, and the upper end of the column is movably connected to the middle position of the photovoltaic module support beam;

The transfer unit includes at least one steel cable, a wire clamp, at least one differential reel and a transmission box, the differential reel and the transmission box are mounted on the column, and the transmission box drives the station The differential winding wheel rotates, and the steel cable connects the photovoltaic module support beam and the differential winding wheel;

A drive unit, which includes a drive shaft and a drive and control device, the drive shaft is rigidly connected to a plurality of the transfer units, the drive and control device controls the rotation of the drive shaft, and the drive shaft drives a plurality of When the transfer unit works, the drive shaft and the transmission box are automatically locked by a self-locking structure.

As a further improvement of the present invention, the differential reel and the transmission box are installed in the middle of the column.

As a further improvement of the present invention, the transfer unit includes two differential reels, and the two differential reels are symmetrically installed on the output shaft of the transmission box.

As a further improvement of the present invention, the transfer unit includes two steel cables, and the two ends of the photovoltaic module support beam are respectively connected to the differential reel through one steel cable.

As a further improvement of the present invention, the differential reel has a tapered spiral groove, the side of the differential reel close to the column has a large diameter, and the two ends of the photovoltaic module support beam are installed The steel cables are respectively wound on the two differential reels with tapered spiral grooves.

As a further improvement of the present invention, the tracking range of the tracking bracket is -50°～+50°.

As a further improvement of the present invention, the self-locking structure is an intermittent mechanism, and the drive shaft and the transmission box realize transmission and position self-locking through the intermittent mechanism.

As a further improvement of the present invention, the intermittent mechanism is one of a ratchet mechanism, a sheave mechanism, a linkage mechanism or an incomplete gear mechanism, and the intermittent mechanism includes but is not limited to the above four forms.

As a further improvement of the present invention, the intermittent mechanism is an incomplete gear mechanism. The gear on the drive shaft has an incomplete number of teeth and rotates in cooperation with the gear on the output shaft of the transmission box. The gear on the drive shaft The rims of the gears on the output shaft of the transmission box and the transmission box have mutually matched locking arcs.

The beneficial effects of the present invention are: by adopting the multi-point coordinated drive of the driving shaft and the transmission box, the driving load is uniformly applied to the tracking bracket, effectively reducing the overall torsional deformation between the photovoltaic modules, thereby ensuring the tracking accuracy of the tracking bracket and the photovoltaic module Power generation efficiency; the use of multi-point effective support greatly improves the overall rigidity of the tracking bracket, which can effectively reduce the vibration response of the structure under wind load, greatly improving the safety and reliability of the tracking bracket, and the use of flexible steel cables is effective Fixed, greatly reducing the material cost of the tracking bracket; at the same time, each driving node position is self-locking, which can effectively improve the stability and reliability of the structure lock, and due to the multi-point load sharing, the strength of the self-locking structure itself is greatly required decline.

Description of the drawings

1 is a schematic diagram of the installation structure of a flexible supporting photovoltaic tracking bracket with self-locking function according to an embodiment of the present invention;

2 is a schematic structural diagram of a flexible supporting photovoltaic tracking bracket with self-locking function according to an embodiment of the present invention;

3 is a schematic structural diagram of a transfer unit with a self-locking function of a flexible supporting photovoltaic tracking bracket according to an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an intermittent mechanism of a flexible supporting photovoltaic tracking bracket with self-locking function according to an embodiment of the present invention.

In the figure,

1. Photovoltaic module support beam; 2. Column; 3. Differential reel; 4. Steel cable; 5. Transmission box; 6. Drive shaft; 7. Drive and control device; 8. Photovoltaic module.

Detailed ways

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figures 1-4, a flexible supporting photovoltaic tracking bracket with self-locking function according to an embodiment of the present invention includes:

The photovoltaic module support frame includes a plurality of photovoltaic module support beams 1, and the photovoltaic module 8 is fixedly installed on the photovoltaic module support beam 1;

Column 2, the lower end of which is fixed on the ground, and the upper end of the column 2 is movably connected to the middle position of the photovoltaic module support beam 1;

The transfer unit includes at least one steel cable 4, a wire clamp, at least one differential reel 3 and a transmission box 5. The differential reel 3 and the transmission box 5 are installed on the column 2, and the transmission box 5 drives the differential The winding wheel 3 rotates, and the steel cable 4 connects the photovoltaic module support beam 1 and the differential winding wheel 3;

The drive unit includes a drive shaft 6 and a drive and control device 7. The drive shaft 6 is rigidly connected to a plurality of transfer units, the drive and control device 7 controls the rotation of the drive shaft 6, and the drive shaft 6 drives the multiple transfer units to work , The drive shaft 6 and the transmission box 5 are automatically locked by a self-locking structure.

Each column 2 position can dynamically and effectively support the 8 PV arrays. The supporting principle is realized by tensioning steel cables 4 on both sides; one end of the steel cable can be fixed to the photovoltaic module support through a steel cable One end of the beam 1, after the steel cable is wound around the differential reel 3, the other end of the steel cable is fixed to the other end of the photovoltaic module support beam 1. It is also possible to connect a differential reel 3 and a differential reel 3 through two steel cables 4 respectively. The photovoltaic module supports one end of the beam 1. In the process of tracking the sun trajectory of the tracking support, the steel cables 4 on both sides are always in tension. When the wind load acts on the photovoltaic tracking system, the tensioned steel cables 4 can greatly improve the overall rigidity of the structure. Produce effective support and effectively reduce the vibration response caused by wind load. A transfer unit for driving the photovoltaic module 8 is respectively arranged on each column 2, and each transfer unit works with the photovoltaic module 8 to drive the photovoltaic module 8 to track the sun's trajectory within a certain range. The drive unit provides the power source for the entire row of tracking brackets. The drive torque output by the drive unit is transmitted to each transfer unit through a drive shaft. The transfer unit and the drive shaft 6 are rigidly connected to ensure the accuracy of the entire transmission. The driving unit distributes the driving torque to each transfer unit through the drive shaft 6, and then the transfer unit drives the photovoltaic module 8 array to move. The driving load is evenly applied to the tracking bracket, which greatly reduces the overall torsion of the structure caused by single-point driving. Deformation can ensure the tracking accuracy and the power generation efficiency of the photovoltaic module 8.

Further, the differential reel 3 and the transmission box 5 are installed in the middle of the column 2, which can allow the tracking bracket to obtain a larger rotation angle with a small number of drive shaft revolutions, and also make the force of the entire tracking bracket relatively stable.

Further, the transfer unit includes two differential reels 3, and the two differential reels 3 are symmetrically installed on the output shaft of the transmission box 5. The amount of expansion and contraction of the steel cables 4 on both sides of the tracking bracket is different during the rotation, and the differential reel 3 is required to realize the differential coordination between the pay-off amount and the take-up amount.

Further, the transfer unit includes two steel cables 4, and the two ends of the photovoltaic module support beam 1 are respectively connected to a differential winding wheel 3 through a steel cable 4.

Further, the differential reel 3 has a tapered spiral groove, the side of the differential reel 3 close to the column 2 has a large diameter, and the two steel cables 4 installed at the two ends of the photovoltaic module support beam 1 are respectively wound in two On the differential winding wheel 3 with a tapered spiral groove.

The differential reel 3 can perfectly match the amount of wire take-up and take-off through the tapered spiral wire, so that the wire rope 4 is always in tension. The steel cables 4 on both sides are respectively wound on two differential reels 3 with tapered spiral grooves. The two differential reels 3 are simultaneously fixedly installed on the output shaft of the transmission box 5 and installed back to back. When the output shaft of the transmission box 5 rotates in one direction, the two back-to-back differential reels 3 can realize the differential movement of the winding and paying-off, and the tapered spiral groove is used to realize the winding and paying-off amount The precise control of the steel cable can always ensure that the cable 4 is in a tensioned state, improve the overall rigidity of the tracking bracket, and enhance the safety and reliability of the tracking bracket under the action of strong wind.

Further, the tracking range of the tracking bracket is -50° to +50°, and this rotation range can better enable the tracking bracket to receive sunlight in the maximum range.

Further, the self-locking structure is an intermittent mechanism, and the drive shaft 6 and the transmission box 5 realize transmission and position self-locking through the intermittent mechanism. The position of each driving node is self-locked, which can effectively improve the stability and reliability of the structure lock, and due to the multi-point load sharing, the strength requirement of the self-locking structure itself is greatly reduced, and the self-locking function can be realized by an intermittent mechanism.

Further, the intermittent mechanism is one of a ratchet mechanism, a sheave mechanism, a linkage mechanism, or an incomplete gear mechanism, and it can also be replaced with other intermittent mechanisms that can realize a self-locking function.

Further, the intermittent mechanism is an incomplete gear mechanism. The gear on the drive shaft 6 has an incomplete number of teeth and rotates in cooperation with the gear on the output shaft of the transmission box 5. The gear on the drive shaft 6 and the output shaft of the transmission box 5 The rims of the gears have matching locking arcs.

The drive unit distributes the drive torque to the transmission box 5 in each transfer unit through the drive shaft 6. The transmission box 5 adopts an intermittent mechanism. When the working transmission parts are engaged, the working torque is transmitted to drive the photovoltaic module 8 to track the sun's trajectory. After the process is over, the locking parts of the intermittent mechanism are engaged to form a partial self-locking. When the intermittent structure is in the self-locking position, each transfer unit is in the locked position, and the steel cable 4 is in a tensioned state, forming a reliable and stable support for the photovoltaic module 8 array. Intermittent mechanisms include but are not limited to incomplete gear mechanisms.

Specific use:

The column 2 of the photovoltaic tracking bracket is installed on a pre-set concrete support. The columns 2 are arranged at equal intervals. The column 2 and the concrete support are connected by steel column feet. The columns 2 of each group of photovoltaic tracking brackets are ensured to be in a straight line. The photovoltaic module 8 array is installed on the photovoltaic module support frame. The lower ends of the photovoltaic module support beam 1 of the photovoltaic module support frame are provided with fixing rings connecting the steel cables 4, and two tapered spiral grooves are installed in the middle of the column. Differential reel 3, two differential reels 3 are arranged back to back, the side with the larger diameter is fixed on the column 2, one end of the steel cable 4 is connected to the fixed ring on the lower side of the end of the photovoltaic module support beam 1, The other end is fixed on a differential reel 3 with a tapered spiral groove. The length of the steel cable 4 is adjusted to be in a tensioned state during installation and then fixed with a wire clamp to ensure the stability of the device. The transmission box 5 is installed in the middle of the two differential reel 3, the output shaft of the transmission box 5 is connected with the differential reel 3 to drive the differential reel 3 to rotate, and the transmission box 5 rotates with the drive shaft 6 through a gear Connected, the drive shaft 6 and the photovoltaic module support beam 1 are arranged perpendicular to each other, the drive shaft 6 is only provided with gears at the connection with the transmission box 5, and one drive shaft 6 drives a group of photovoltaic tracking brackets to rotate simultaneously. The gear connection of the drive shaft 6 and the transmission box 5 is an incomplete gear mechanism. The gear (driving wheel) on the drive shaft 6 has two teeth, and the gear (driven wheel) of the transmission box 5 has multiple sections, and each section has a drive Axis 6 gear has corresponding number of cogging. The driving wheel and the driven wheel also have matching locking arcs. The driving wheel drives the driven wheel to rotate when the toothed parts are meshed. When there is no gear, the driven wheel stops. When the driven wheel stops, the driving The locking arc on the wheel and the locking arc on the driven wheel are locked in cooperation with each other to ensure that the driven wheel stops at a predetermined position. The photovoltaic module 8 array can be driven by the drive shaft 6, the transmission box 5, and the steel cable 4 to rotate within a range of plus or minus 50°. The driving and control unit 7 drives and adjusts the rotation of the photovoltaic tracking bracket according to the sun trajectory to ensure that the photovoltaic module 8 array is better It can accept sunlight to improve power generation efficiency; at the same time, multi-point effective support and multi-point position self-locking improve the strength and safety and reliability of the tracking bracket.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

A flexible supporting photovoltaic tracking bracket with self-locking function, which is characterized in that it comprises:

The photovoltaic module support frame includes a plurality of photovoltaic module support beams (1), and the photovoltaic module (8) is fixedly installed on the photovoltaic module support beam (1);

A column (2), the lower end of which is fixed on the ground, and the upper end of the column (2) is movably connected to the middle position of the photovoltaic module support beam (1);

A transfer unit, which includes at least one steel cable (4), a wire clamp, at least one differential reel (3) and a transmission box (5), the differential reel (3) and the transmission box ( 5) Installed on the column (2), the transmission box (5) drives the differential reel (3) to rotate, and the steel cable (4) connects the photovoltaic module support beam (1) and The differential reel (3);

A drive unit, which includes a drive shaft (6) and a drive and control device (7), the drive shaft (6) is rigidly connected to a plurality of the transfer units, and the drive and control device (7) controls the The drive shaft (6) rotates, the drive shaft (6) drives a plurality of transfer units to work, and the drive shaft (6) and the transmission box (5) are self-locked by a self-locking structure.
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 1, characterized in that the differential reel (3) and the transmission box (5) are installed on the column (2) The middle.
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 1, characterized in that, the transfer unit includes two differential reels (3), two differential reels The wire wheel (3) is symmetrically installed on the output shaft of the transmission box (5).
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 3, wherein the transfer unit comprises two steel cables (4), and both ends of the photovoltaic module supporting beam (1) They are respectively connected with one of the differential reel (3) through one of the steel cables (4).
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 4, characterized in that the differential reel (3) has a tapered spiral groove, and the differential reel (3) ) The side close to the column (2) has a large diameter, and the two steel cables (4) installed at both ends of the photovoltaic module support beam (1) are respectively wound on the two differentials with tapered spiral grooves. On the reel (3).
The flexible supporting photovoltaic tracking support with self-locking function according to claim 1, wherein the tracking range of the tracking support is -50°～+50°.
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 1, wherein the self-locking structure is an intermittent mechanism, and the drive shaft (6) and the transmission box (5) pass through the intermittent mechanism. The mechanism realizes transmission and position self-locking.
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 7, wherein the intermittent mechanism is one of a ratchet mechanism, a sheave mechanism, a linkage mechanism or an incomplete gear mechanism.
The flexible supporting photovoltaic tracking bracket with self-locking function according to claim 7, characterized in that the intermittent mechanism is an incomplete gear mechanism, and the number of teeth of the gear on the drive shaft (6) is incomplete, and Cooperate with the gear on the output shaft of the transmission box (5) to rotate, and the rims of the gear on the drive shaft (6) and the gear on the output shaft of the transmission box (5) have mutually matched locking arcs .