Extremely-low-speed small-force damper for photovoltaic tracking system

Abstract

The utility model relates to the field of dampers, in particular to an extremely-low-speed small-force damper for a photovoltaic tracking system, which comprises a cylinder body and a piston valve in sliding fit in the cylinder body, a normally open channel is arranged on the piston valve, and two ends of the normally open channel are always communicated with cavities on two sides of a piston body. The tracking device has the effect of reducing the influence of the damper on the driver of the tracking device.

Description

Technical Field

[0001] The present application relates to the technical field of dampers, and in particular to an extremely low-speed and low-force damper for a photovoltaic tracking system. Background Art

[0002] In a flat single-axis photovoltaic tracking device, dampers are symmetrically installed on the rotating axis to weaken the impact force when the solar photovoltaic components are shaken by external forces such as wind, and to reduce the impact on the rotary drive device and damage to the device.

[0003] During the compression and extension process of the damper, the oil in the oil cylinder mainly flows and exchanges between the two cylinders through the holes of the plug body and the bottom valve. The piston valve and the bottom valve in the damper are usually closed, but when the damping oil is affected by the movement of the connecting rod, the holes of the plug body and the bottom valve will be opened, and the viscosity will be generated by the flow in the hole. This viscosity is transmitted to the joints at both ends of the damper to form a damping force, thereby changing the vibration frequency of the tracking bracket caused by wind and preventing the damage of the tracking device.

[0004] During use, the solar tracking device will autonomously drive the tracking device to rotate as the sun moves, and the damper installed on the tracking device will also rotate. This is reflected in the damper's linear operating speed, which is generally 1-3mm / s. However, the damping force generated by the damper at this speed will affect the tracking device driver, increasing the driver load. Utility Model Content

[0005] In order to reduce the influence of the damper on the driver in the photovoltaic tracking system when the damper is used in the photovoltaic tracking system, the present application provides an extremely low-speed and small-force damper for the photovoltaic tracking system.

[0006] The present application provides an extremely low speed and low force damper for a photovoltaic tracking system using the following technical solutions:

[0007] An extremely low-speed, low-force damper for a photovoltaic tracking system comprises a cylinder body and a piston valve slidably fitted in the cylinder body, wherein the piston valve is provided with a normally open channel, and both ends of the normally open channel are always connected to cavities on both sides of the plug body.

[0008] By adopting the above technical solution, a normally open channel is provided on the plug body, so that the oil can flow normally in the cavities on both sides of the plug body during the slow movement of the plug body, thereby reducing the damping force of the damper when the plug body moves slowly and reducing the impact on the tracking device driver. At the same time, when the plug body moves faster, the normally open channel is not enough for the plug body to move, so that the piston valve is opened or closed to obtain a larger damping force.

[0009] Optionally, the piston valve includes a plug body slidingly fitted in the cylinder body and elastic valve plates installed on both sides of the plug body, and two groups of oil holes are opened on the plug body corresponding to the elastic valve plates. The elastic valve plates abut one end of the oil holes to seal the oil holes.

[0010] By adopting the above technical solution, the elastic valve plate abuts against the end of the oil hole. When the oil pressure in the cavity on the side of the plug body away from the elastic valve plate is high, the elastic valve plate can be driven to deform, thereby opening the oil hole and obtaining damping force.

[0011] Optionally, the cross-sectional area of ​​the normally open channel is not greater than one tenth of the cross-sectional area of ​​the oil hole.

[0012] By adopting the above technical solution, the area of ​​the normally open channel is controlled to control the timing of opening the oil hole, so that the damping force change curve of the damper is more closely matched to the tracking device.

[0013] Optionally, a plurality of oil holes are evenly arranged along the circumference of the plug body.

[0014] By adopting the above technical solution and providing a plurality of oil holes, the force on the plug body is more uniform, thereby increasing the life of the plug body.

[0015] Optionally, the elastic valve plate is an annular structure, and the elastic valve plate abuts against ends of a plurality of oil holes.

[0016] By adopting the above technical solution, the elastic valve plate is arranged as an annular structure to facilitate the blocking of multiple oil holes.

[0017] Optionally, two abutment rings are arranged between the elastic valve plate and the plug body, the two abutment rings have different diameters, one abutment ring is sleeved outside the other abutment ring, and the oil hole is located in the gap between the two abutment rings.

[0018] By adopting the above technical solution, the elastic valve sheet abuts against the abutment ring to achieve blocking of multiple oil holes.

[0019] Optionally, the normally open channel is located on an external abutment ring, and the normally open channel is connected to a gap between two abutment rings.

[0020] By adopting the above technical solution, the normally open channel is connected with the gap between the two abutting rings and then with the oil hole, so that the cavities on both sides of the plug body are always connected. At the same time, the change of the plug body structure can be reduced, which facilitates the processing and manufacturing of the damper.

[0021] Optionally, the oil hole is inclined along the sliding direction of the plug body rod from an end close to the elastic valve plate to an end away from the elastic valve plate in a direction away from the plug body axis.

[0022] By adopting the above technical solution, the oil hole is tilted to avoid the opposite elastic valve sheet, preventing the opposite elastic valve sheet from blocking the oil hole, so that the sizes of the two elastic valve sheets can be the same, which is convenient for production and manufacturing.

[0023] Optionally, the normally open channel is a rectangular groove formed on the end surface of the abutment ring away from the plug body and connected to the interior of the abutment ring.

[0024] By adopting the above technical solution, a groove is cut on the end surface of the abutment ring, the elastic valve sheet abuts on the end surface of the abutment ring, and the position of the cut groove forms a normally open channel. The normally open channel is arranged on the end surface of the abutment ring to facilitate the cutting process of the normally open channel.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Through structural improvement, this application can achieve extremely low damper force when running at an extremely low speed of 1-5 mm / s, which does not affect the operation of the tracking system driver;

[0027] 2. The size of the grooves on the piston and the bottom valve of this application can be customized according to the product model, and only a simple change of the part mold is required, which does not affect the overall cost of the damper.

[0028] 3. The setting of the normally open channel in this application can form a very slow platform section in the starting area of ​​the linear curve of the damper damping force, and turn it into a set of nonlinear curves, so as to better adapt to the normal operation of the photovoltaic tracking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the plug body structure of the first embodiment of the present application.

[0031] Figure 3 It is a linear variation curve diagram of the damping force of the damper of the first embodiment of the present application.

[0032] Figure 4 It is a schematic diagram of the plug body structure of the second embodiment of the present application.

[0033] Figure numerals: 1. cylinder body; 11. working cylinder; 12. oil storage cylinder; 2. piston valve; 21. plug body; 22. pull rod; 23. elastic valve plate; 24. normally open channel; 25. oil hole; 3. gasket; 4. abutment ring; 5. collecting chamber; 6. mounting groove. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-4 This application is described in further detail.

[0035] Reference Figure 1 and Figure 2 , an extremely low-speed, low-force damper for a photovoltaic tracking system, comprising a cylinder body 1 and a piston valve 2, wherein the piston valve 2 is slidably fitted inside the cylinder body 1 and separates the inside of the cylinder body 1 into two cavities, wherein the cavity close to the tie rod 22 is the upper end cavity, and the cavity away from the tie rod 22 is the lower end cavity. Damping force is generated in the process of oil flowing from the upper end cavity to the lower end cavity or from the lower end cavity to the upper end cavity through the piston valve 2, thereby achieving a vibration reduction effect. A tie rod 22 is fixedly connected to the piston valve 2, and the tie rod 22 is arranged along the length direction of the cylinder body 1, and the end of the tie rod 22 away from the piston valve 2 extends to the outside of the cylinder body 1.

[0036] Reference Figure 1 and Figure 2 The cylinder body 1 includes a working cylinder 11 and an oil storage cylinder 12. The oil storage cylinder 12 is sleeved outside the working cylinder 11, and an oil storage chamber is formed between the working cylinder 11 and the oil storage cylinder 12. A bottom valve is arranged between the two cylinder bodies 1 to control the on-off of the oil storage chamber and the inside of the working cylinder 11. The piston valve 2 includes a plug body 21 and an elastic valve sheet 23 arranged on both sides of the plug body 21. Two groups of oil holes 25 penetrating the plug body 21 are opened on the piston. The elastic valve sheet 23 is arranged corresponding to the two groups of oil holes 25 and is sealed at one end of the oil hole 25 to make the cavities on both sides of the plug body 21 unidirectional. The two elastic valve sheets 23 work alternately to adapt to the movement of the plug body 21 in different directions.

[0037] Reference Figure 1 and Figure 2 A mounting rod is provided at one end of the pull rod 22 close to the plug body 21. The mounting rod and the pull rod 22 are integrally formed to form a stepped shaft structure. A through hole is provided on the plug body 21. The plug body 21 is sleeved on the mounting rod. A nut is provided on the side of the plug body 21 away from the pull rod 22. The nut is threadedly connected to the mounting rod to fix the plug body 21.

[0038] Reference Figure 1 and Figure 2 The present application discloses an extremely low speed and small force damper for a photovoltaic tracking system. A normally open channel 24 is provided on the plug body 21, and the normally open channel 24 is connected to the upper end cavity and the lower end cavity at the same time. Figure 3 , so that the oil can pass smoothly when the plug body 21 moves at a low speed. In this state, the plug body 21 of the damper can move normally, and the damping force it is subjected to is small, thereby reducing the impact on the driver in the photovoltaic tracking device. At the same time, when the oil moves at a medium or high speed, the normal passage 24 is not sufficient for the normal passage of the oil, forcing the elastic valve plate 23 on the plug body 21 to move away from the piston, so that the oil hole 25 opens, generating a larger damping force to achieve a better anti-vibration effect. In other embodiments, a normal passage 24 can also be provided on the bottom valve to ensure that the oil storage chamber is always connected to the inside of the working cylinder 11.

[0039] Reference Figure 1 and Figure 2 , each group of oil holes 25 includes a plurality of oil holes 25 evenly spaced along the circumference of the piston to improve the uniformity of the force on the piston. In this embodiment, the elastic valve plate 23 is formed by a plurality of disc springs connected in series. The disc spring is sleeved on the mounting rod, and one end of the disc spring abuts against the plug body 21 to block the oil hole 25, and the other end abuts against the pull rod 22. A gasket 3 is provided on the side of the elastic valve plate 23 away from the plug body 21, and the gasket 3 is sleeved on the mounting rod. One end of the elastic valve plate 23 away from the plug body 21 abuts against the gasket 3 to reduce the friction between the elastic valve plate 23 and the pull rod 22.

[0040] Reference Figure 1 and Figure 2 The oil hole 25 is inclined along the axial direction of the plug body 21 from the end close to the elastic spring to the end away from the elastic spring toward the direction away from the axis of the plug body 21, so that the oil hole 25 is staggered with another group of elastic valve plates 23, reducing the mutual influence between the two groups of elastic valve plates 23.

[0041] Reference Figure 1 and Figure 2 Two abutting rings 4 are arranged on the side of the plug body 21 close to the elastic valve plate 23. The two abutting rings 4 have different radii and are coaxially arranged. A collecting chamber 5 is formed between the two abutting rings 4, and the oil hole 25 is connected to the collecting chamber 5. The elastic valve plate 23 abuts on the side of the abutting ring 4 away from the plug body 21, so as to facilitate the elastic valve plate 23 to block the oil hole 25. The normally open channel 24 is provided on the abutting ring 4. In this embodiment, the normally open channel 24 is a rectangular groove opened on the end surface of the abutting ring 4 away from the plug body 21 and connected to the inside and outside of the abutting ring 4, so as to facilitate the processing of the normally open channel 24. The cross-sectional area of ​​the normally open channel 24 is smaller than the cross-sectional area of ​​the oil hole 25, and the ratio between the cross-sectional area of ​​the normally open channel 24 and the cross-sectional area of ​​the oil hole 25 is 10:1, so as to ensure that the elastic valve plate 23 can deform normally when the plug body 21 moves at medium or high speed. A plurality of normally open channels 24 can be evenly arranged along the circumference of the connecting ring to improve the stability of the oil flow process. In this embodiment, two normally open channels 24 are arranged.

[0042] The implementation principle of an extremely low-speed, low-force damper for a photovoltaic tracking system in an embodiment of the present application is as follows: a normally open channel 24 is provided on the plug body 21 so that the cavities on both sides of the plug body 21 are always connected, so that the oil can flow normally when the plug body 21 moves at a low speed, thereby reducing the influence of the damper on the driver of the photovoltaic tracking system.

[0043] Example 2

[0044] Reference Figure 4, the difference between this embodiment and embodiment 1 is that, in this embodiment, the abutment ring 4 is detachably connected to the plug body 21. An annular mounting groove 6 is provided at a position corresponding to the abutment ring 4 on the plug body 21, and one end of the abutment ring 4 close to the plug body 21 is inserted into the mounting groove 6. An internal thread is provided on the inner side wall of the abutment ring 4, and a thread groove is provided on the side wall corresponding to the internal thread of the mounting groove 6, and the internal thread fits in the thread groove to realize the detachable connection between the abutment ring 4 and the plug body 21. In actual application, a plurality of abutment rings 4 can be provided, and the cross-sectional areas of the normally open channels 24 on the plurality of abutment rings 4 are different. By replacing the abutment ring 4, the curve of the damping force of the damper changing with the moving speed of the plug body 21 can be adjusted to be suitable for tracking devices of different specifications under different environments.

[0045] The implementation principle of an extremely low-speed, low-force damper for a photovoltaic tracking system in an embodiment of the present application is as follows: by replacing the abutment ring 4, the cross-sectional area of ​​the normally open channel 24 is changed, so as to achieve a curve of the damping force of the damper changing with the moving speed of the plug body 21, so as to adapt to tracking devices of different specifications in different environments.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An extremely low speed and low force damper for a photovoltaic tracking system, comprising a cylinder (1) and a piston valve (2) slidably fitted in the cylinder (1), characterized in that: The piston valve (2) is provided with a normally open channel (24), and both ends of the normally open channel (24) are always connected to the cavities on both sides of the plug body (21).

2. The ultra-low speed and small force damper for a photovoltaic tracking system according to claim 1, characterized in that: The piston valve (2) comprises a plug body (21) slidably fitted in the cylinder body (1) and elastic valve plates (23) mounted on both sides of the plug body (21); two groups of oil holes (25) are formed on the plug body (21) corresponding to the elastic valve plates (23); the elastic valve plates (23) abut against one end of the oil holes (25) to seal the oil holes (25).

3. The ultra-low speed and small force damper for a photovoltaic tracking system according to claim 2, characterized in that: The cross-sectional area of ​​the normally open channel (24) is no greater than one tenth of the cross-sectional area of ​​the oil hole (25).

4. The ultra-low speed and small force damper for a photovoltaic tracking system according to claim 2, characterized in that: A plurality of oil holes (25) are evenly arranged along the circumference of the plug body (21).

5. The extremely low speed and small force damper for a photovoltaic tracking system according to claim 4, characterized in that: The elastic valve plate (23) is an annular structure, and the elastic valve plate (23) abuts against the ends of the plurality of oil holes (25).

6. The extremely low speed and small force damper for a photovoltaic tracking system according to claim 5, characterized in that: Two abutment rings (4) are arranged between the elastic valve plate (23) and the plug body (21); the two abutment rings (4) have different diameters, one abutment ring (4) is sleeved outside the other abutment ring (4), and the oil hole (25) is located in the gap between the two abutment rings (4).

7. The extremely low speed and small force damper for a photovoltaic tracking system according to claim 6, characterized in that: The normally open channel (24) is located on the outer abutment ring (4), and the normally open channel (24) is connected to the gap between the two abutment rings (4).

8. The extremely low speed and small force damper for a photovoltaic tracking system according to claim 6, characterized in that: The oil hole (25) is inclined in a direction away from the axis of the plug body (21) from an end close to the elastic valve plate (23) to an end away from the elastic valve plate (23) along the sliding direction of the rod of the plug body (21).

9. The ultra-low speed and small force damper for a photovoltaic tracking system according to claim 1, characterized in that: The normally open channel (24) is a rectangular groove formed on the end surface of the abutment ring (4) away from the plug body (21) and communicating with the interior of the abutment ring (4).

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