Damper for photovoltaic equipment

Abstract

The damper for the photovoltaic equipment comprises an oil storage cylinder, a working cylinder, a piston body and a piston rod, the piston body and the piston rod are movably arranged in the working cylinder, a sealing piston is fixedly arranged in one end of the oil storage cylinder, and the end opening of the oil storage cylinder is folded to form the sealing piston to form a limiting flange matched with the sealing piston in a limiting mode. A plurality of first sealing rings are arranged between the outer wall of a sealing piston and the inner wall of an oil storage cylinder, a second sealing ring in extrusion contact with a limiting flange is arranged on the end face of one end of the sealing piston, and a multi-stage first sealing barrier is formed through the first sealing rings, so that the oil pressure load is dispersed, and the risk of single-point failure is reduced; a second sealing barrier is formed at the end opening of the oil storage cylinder through the first sealing ring, long-term stable attachment of the second sealing ring is ensured through mechanical extrusion and pre-tightening force design, the sealing leakage probability of the damper can be remarkably reduced through the sealing structure of the technical scheme, meanwhile, the maintenance period is prolonged, and the operation reliability of photovoltaic equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of damper technology, specifically to a damper for photovoltaic equipment. Background Technology

[0002] In photovoltaic tracking devices of photovoltaic power generation systems, dampers are installed on the rotating shaft of photovoltaic equipment to reduce the impact force when solar photovoltaic modules sway due to external forces such as wind.

[0003] Existing photovoltaic dampers mainly consist of an oil reservoir, a working cylinder, a sealing piston, a bottom valve, a connecting rod, and a piston. The sealing piston is located at one end of the oil reservoir, while the working cylinder, filled with damping medium, is located inside the reservoir. The piston and connecting rod slide together within the working cylinder, with one end of the connecting rod passing through the sealing piston and extending out of the oil reservoir. During compression and tension, the oil in the reservoir flows and exchanges between the two cylinders primarily through the orifices of the piston and bottom valve. While the piston and bottom valve are normally closed, when the damping oil is affected by the movement of the connecting rod, the orifices at both the piston and bottom valve open. The flow within these orifices generates viscous force, which is transmitted to the joints at both ends of the damper to form damping force. However, existing photovoltaic dampers frequently experience sealing leaks in practical use, primarily at the sealing piston position. Although a sealing ring is installed between the sealing piston and the inner wall of the oil reservoir, the sealing effect is poor, and the sealing protection structure is not stable or reliable enough, affecting product performance and lifespan. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that photovoltaic dampers in the prior art often experience sealing leakage accidents at the sealing piston position in actual use, resulting in poor sealing effect and affecting product performance. Thus, a damper for photovoltaic equipment with good sealing performance, improved sealing redundancy and durability, and extended overall lifespan is provided.

[0005] To solve the above-mentioned technical problems, this utility model provides a damper for photovoltaic equipment, including an oil reservoir, a working cylinder, and a piston assembly. The working cylinder is disposed inside the oil reservoir. The piston assembly includes a piston body and a piston rod that are reciprocally disposed in the working cylinder. A sealing piston is fixedly disposed inside one end of the oil reservoir. One end of the piston rod extends out of the oil reservoir through the sealing piston. A sealing structure is provided between the sealing piston and the oil reservoir. The sealing structure includes a plurality of first sealing rings disposed between the outer wall of the sealing piston and the inner wall of the oil reservoir, a limiting stop folded and formed at the port of the oil reservoir and forming a limiting fit with the sealing piston, and at least one second sealing ring disposed on one end face of the sealing piston and in pressing contact with the limiting stop.

[0006] As a preferred embodiment, the oil storage cylinder is provided with a limiting recess that presses against the other end of the sealing piston. Under the pressure of the limiting recess, the sealing piston cooperates with the limiting stop to press the second sealing ring.

[0007] As a preferred embodiment, the limiting recess is an annular concave rib formed by pressing the side wall of the oil storage cylinder, and the other end of the sealing piston is provided with a beveled structure that cooperates with and abuts against the annular protrusion.

[0008] As a preferred embodiment, one end of the oil reservoir is provided with an opening surrounded by the limiting stop, one end of the sealing piston is provided with a protrusion that matches and is accommodated in the opening, and a stepped portion formed on the outside of the protrusion and cooperating with the limiting stop, and the second sealing ring is embedded in the stepped portion around the protrusion.

[0009] As a preferred embodiment, the stepped portion is provided with a second annular groove for installing the second sealing ring; the outer peripheral sidewall of the sealing piston is provided with a plurality of first annular grooves for installing a plurality of first sealing rings, and the plurality of first annular grooves are distributed at intervals along the axial direction of the sealing piston.

[0010] As a preferred embodiment, a sealing cap is installed at the other end of the oil reservoir, the oil reservoir has an oil storage chamber, the working cylinder has a working chamber, the piston body is reciprocated in the working chamber, and a compensating bottom valve for connecting the working chamber and the oil storage chamber is provided at the right end of the working cylinder near the sealing cap.

[0011] As a preferred embodiment, the left end of the working cylinder is provided with a plug that is sealed and connected to the sealing piston. The plug and the sealing piston each have a central hole through which the piston rod can pass. A third sealing ring that is in sealing contact with the piston rod is provided at the central hole of the plug. The central hole of the sealing piston is filled with at least one sealing element that is in sealing contact with the piston rod.

[0012] As a preferred embodiment, the piston rod has a connecting rod at one end that passes through the sealing piston, and a locking nut at the other end for fastening the piston body.

[0013] As a preferred embodiment, the piston body is provided with at least one oil-saving hole extending through both sides thereon, and two sets of elastic valve plates are provided on both sides of the piston body to cooperate and block the two ends of the oil-saving hole. The diameter of the two ends of the oil-saving hole is larger than the diameter of the middle end of the oil-saving hole.

[0014] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0015] 1. The photovoltaic equipment damper provided by this utility model, by setting multiple first sealing rings between the outer wall of the sealing piston and the inner wall of the oil storage cylinder, and by arranging the multiple first sealing rings axially along the outer wall of the sealing piston, can form a multi-level first sealing barrier, disperse the oil pressure load, reduce the risk of single-point failure, extend the overall life, and improve the sealing redundancy and durability; and by combining the limiting baffle at the port of the oil storage cylinder, by setting a second sealing ring at one end of the sealing piston that is in extrusion contact with the limiting baffle, a second sealing barrier is formed at the port of the oil storage cylinder. Through mechanical extrusion and pre-tightening force design, the second sealing ring is ensured to be stably fitted for a long time. Even if the internal first sealing ring has a micro-leakage due to high pressure or wear, the second sealing ring can intercept the leaking medium and prevent it from directly leaking out. The sealing structure designed with this technical solution can significantly reduce the sealing leakage probability of the photovoltaic damper, while extending the maintenance cycle and improving the operational reliability of the photovoltaic equipment, and is especially suitable for complex working conditions with high vibration and large temperature difference outdoors.

[0016] 2. In the photovoltaic equipment damper provided by this utility model, a limiting recess is provided on the oil reservoir to press against the other end of the sealing piston. The limiting recess and the limiting stop constitute a two-way mechanical limiting of the sealing piston in the axial direction, and a mechanical pre-tightening force is applied to the sealing piston, forcibly locking the sealing piston in one end of the oil reservoir. This forces the second sealing ring to be in a uniformly compressed state during installation, forming a stable initial sealing pressure. Even if the damper is subjected to high-frequency vibration or impact load, the sealing piston cannot be axially offset due to force fluctuations, ensuring that the second sealing ring always maintains a tight compression state with the limiting stop. This second sealing ring, through the design of two-way limiting and continuous pre-tightening, greatly improves the sealing reliability.

[0017] 3. In the photovoltaic equipment damper provided by this utility model, the limiting recess is a ring-shaped concave rib formed by pressing and shaping on the side wall of the oil storage cylinder. The pressing and shaping process has low cost, compact structure, high efficiency, and reduces the number of parts. During assembly, the ring-shaped concave rib and the limiting stop edge jointly squeeze the sealing piston, so that the second sealing ring is pre-compressed to the designed deformation, forming a stable initial sealing pressure. This design improves the sealing performance and stability of the second sealing ring installation through bidirectional mechanical limiting and pre-tightening force synergistic regulation, which can maintain the sealing contact pressure and extend the sealing life. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the stacked structure of a damper for photovoltaic equipment, which is a utility model.

[0020] Figure 2 for Figure 1 A schematic diagram of the sealing piston installation structure shown;

[0021] Figure 3 This is a cross-sectional structural diagram of the sealing piston of the utility model.

[0022] Figure 4 for Figure 1 The diagram shows an enlarged view of the piston assembly.

[0023] Figure descriptions: 1. Oil reservoir; 10. Oil reservoir chamber; 11. Limiting flange; 12. Limiting recess; 13. Sealing cover; 2. Working cylinder; 20. Working chamber; 3. Piston rod; 31. Locking nut; 4. Piston body; 41. Oil-saving hole; 42. Elastic valve plate; 5. Sealing piston; 51. Protrusion; 52. Stepped part; 53. First annular groove; 54. Second annular groove; 55. Seal; 6. First sealing ring; 7. Second sealing ring; 8. Compensating bottom valve; 9. Plug; 91. Third sealing ring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other in terms of limiting and blocking edges.

[0027] Example

[0028] This utility model provides, for example Figure 1-4 A damper for photovoltaic equipment is shown, comprising an oil reservoir 1, a working cylinder 2, and a piston assembly. The working cylinder 2 is disposed inside the oil reservoir 1. The piston assembly includes a piston body 4 and a piston rod 3 reciprocatingly disposed in the working cylinder 2. The piston body 4 and the piston rod 3 are linked and cooperate. The working cylinder 2 is filled with a damping medium. A sealing piston 5 is fixedly disposed inside one end of the oil reservoir 1. One end of the piston rod 3 extends out of the oil reservoir 1 through the sealing piston 5. A sealing structure is provided between the sealing piston 5 and the oil reservoir 1. The sealing structure includes a plurality of first sealing rings 6 disposed between the outer wall of the sealing piston 5 and the inner wall of the oil reservoir 1, a limiting stop 11 folded and formed at the port of the oil reservoir 1 and forming a limiting cooperation with the sealing piston 5, and at least one second sealing ring 7 disposed on one end face of the sealing piston 5 and in pressing contact with the limiting stop 11.

[0029] The above-described implementation method is the core technical solution of this embodiment. By setting multiple first sealing rings 6 between the outer wall of the sealing piston 5 and the inner wall of the oil reservoir 1, and by arranging the multiple first sealing rings 6 axially along the outer wall of the sealing piston 5, a multi-level first sealing barrier is formed, which disperses the oil pressure load, reduces the risk of single-point failure, extends the overall life, and improves the sealing redundancy and durability. In addition, combined with the limiting baffle 11 at the port of the oil reservoir 1, a second sealing ring 7 is set at one end of the sealing piston 5 to press against the limiting baffle 11, thereby forming a second sealing barrier at the port of the oil reservoir 1. Through mechanical extrusion and pre-tightening design, it is ensured that the second sealing ring 7 is stably attached to the limiting baffle 11 for a long time. Even if the internal first sealing ring 6 has a micro-leakage due to high pressure or wear, the second sealing ring 7 can still intercept the leaking medium (such as hydraulic oil) and prevent it from leaking directly. The sealing structure designed with this technical solution can significantly reduce the sealing leakage probability of the photovoltaic damper, while extending the maintenance cycle and improving the operational reliability of photovoltaic equipment (such as tracking brackets). It is especially suitable for complex working conditions with high vibration and large temperature difference outdoors.

[0030] In a further preferred configuration, the oil reservoir 1 is provided with a limiting recess 12 that presses against the other end of the sealing piston 5. Under the pressure of the limiting recess 12, the sealing piston 5 cooperates with the limiting stop 11 to press the second sealing ring 7. The limiting recess 12 and the limiting stop 11 form a bidirectional mechanical limiting of the sealing piston 5 in the axial direction and apply a mechanical preload to the sealing piston 5, forcibly locking the sealing piston 5 in one end of the oil reservoir 1. This forces the second sealing ring 7 to be in a uniformly compressed state during installation, forming a stable initial sealing pressure. Even if the damper is subjected to high-frequency vibration or impact load, the sealing piston 5 cannot be axially offset due to force fluctuations, ensuring that the second sealing ring 7 always maintains a tight compression state with the limiting stop 11. This design of bidirectional limiting and continuous preload significantly improves the sealing reliability of the second sealing ring 7.

[0031] like Figure 1-2 As shown, the limiting recess 12 is an annular concave rib formed by pressing the side wall of the oil reservoir 1 inward. The other end of the sealing piston 5 is provided with a beveled structure that abuts against the annular protrusion. This annular concave rib, integrally formed on the side wall of the oil reservoir 1, has low pressing cost, compact structure, high efficiency, and reduces the number of parts. During assembly, the annular concave rib and the limiting stop 11 jointly squeeze the sealing piston 5, so that the second sealing ring 7 is pre-compressed to the designed deformation, forming a stable initial sealing pressure. This design improves the sealing performance and stability of the second sealing ring installation through bidirectional mechanical limiting and pre-tightening force synergistic regulation, which can maintain the sealing contact pressure and extend the sealing life.

[0032] One end of the oil storage cylinder 1 is provided with an opening surrounded by the limiting flange 11, combined with Figure 1-3As shown, one end of the sealing piston 5 is provided with a protrusion 51 that matches and is accommodated in the opening, and a stepped portion 52 formed on the outside of the protrusion 51 and cooperating with the limiting stop 11. The second sealing ring 7 is embedded in the stepped portion 52 around the protrusion 51. The stepped portion 52 is provided with a second annular groove 54 for installing the second sealing ring 7. The second annular groove 54 plays a limiting installation role for the second sealing ring 7 at one end of the sealing piston 5. Correspondingly, the outer peripheral sidewall of the sealing piston 5 is provided with a plurality of first annular grooves 53 for installing a plurality of first sealing rings 6. The plurality of first annular grooves 53 are distributed at intervals along the axial direction of the sealing piston 5. This technical solution employs multiple first sealing rings 6 to achieve radial sealing between the outer wall of the sealing piston and the inner wall of the oil reservoir, and second sealing rings 7 to achieve axial sealing between the sealing piston 5 and the limiting flange 11 at the end of the oil reservoir. Furthermore, the limiting flange 11 and the limiting recess 12 provide axial mechanical limiting for the sealing piston 5, ensuring that the second sealing ring 7 remains tightly pressed against the limiting flange 11. Through the design of multiple sealing barriers and mechanical limiting structures, this technical solution achieves comprehensive sealing protection for the sealing piston 5 at the oil reservoir port, including static leak prevention and dynamic anti-displacement, effectively overcoming the leakage accidents that occur in the sealing piston of the damper during actual use and improving the product's service life.

[0033] In the damper provided in this embodiment, such as Figure 1As shown, a sealing cap 13 is installed at the other end of the oil storage cylinder 1. The oil storage cylinder 1 has an oil storage chamber 10, and the working cylinder 2 has a working chamber 20. The piston body 4 is reciprocally moved in the working chamber 20. The piston body and the inner wall of the working cylinder are in sealed contact. A plug 9 is provided at the left end of the working cylinder 2 to be sealed and connected to the sealing piston 5. The plug 9 and the sealing piston 5 each have a central hole through which the piston rod 3 can pass. A third sealing ring 91 is provided at the central hole of the plug to be in sealed contact with the piston rod 3. At least one sealing element 55 is filled in the central hole of the sealing piston 5 to be in sealed contact with the piston rod 3 to prevent oil from overflowing from the center position of the sealing piston. The sealing performance is good. In this way, the dynamic sealing connection between the piston rod 3 and the plug 9 is achieved by setting the third sealing ring 91, and the dynamic sealing connection between the piston rod and the sealing piston is achieved by setting the sealing element 55. In a further preferred configuration, the right end of the working cylinder 2 near the sealing cover 13 is provided with a compensating bottom valve 8 for connecting the working chamber 20 and the oil storage chamber 10. Based on the sliding fit between the piston body 4 and the inner wall surface of the working cylinder 2, the working chamber 20 is divided into a rebound chamber located above the piston body 4 and a compression chamber located between the piston body 4 and the compensating bottom valve 8. The compensating bottom valve 8 has a valve orifice that opens in response to pressure changes. When the piston rod 3 moves into the working cylinder 2, a vacuum can be generated on the piston body 4 side of the working chamber 20. This allows the compensating bottom valve 8 to allow the damping medium contained in the working chamber 20 to expand into the oil storage chamber 10 as the piston rod 3 moves into the working cylinder 2, thus preventing the formation of a vacuum. Furthermore, when the piston rod 3 moves out of the working cylinder 2, the compensating bottom valve 8 can also allow the damping medium to return from the oil storage chamber 10 to the working chamber 20. Therefore, the compensating bottom valve plays a role in replenishing oil to the inner cylinder during the piston assembly's recovery process.

[0034] Combination Figure 1 and Figure 4As shown, the piston rod 3 has a connecting rod at one end that passes through the sealing piston 5, and a locking nut 31 at the other end for fastening the piston body 4. The connecting rod can be connected to the bracket of the photovoltaic device, and the locking nut 31 keeps the piston rod 3 and the piston body 4 fixedly connected. Further preferably, the piston body 4 includes at least one oil-saving hole 41 that runs through both sides of it. The diameter of the two ends of the oil-saving hole 41 is larger than the diameter of the middle end of the oil-saving hole 41. This oil-saving hole 41 design, which is large at both ends and small in the middle, achieves the synergistic effect of linearizing the damping force, minimizing energy consumption, and improving durability through flow channel gradual optimization and precise throttling control. The piston assembly also includes two sets of elastic valve plates 42 on both sides of the piston body 4, which cooperate to block the two ends of the oil-saving hole. During the movement of the piston assembly, the elastic valve plates 42 can open or close according to the pressure change, so as to expose the flow area of ​​the oil-saving hole 41 to allow the damping medium to pass through, thereby realizing adaptive damping control. For example, when the piston moves rapidly due to external impact (such as sudden wind or snow load), the oil flow rate increases sharply, and the pressure difference at both ends of the throttling hole exceeds the elastic threshold of the baffle, causing the baffle to bend and deform in response, thereby opening the oil-saving hole to allow the oil to flow through. This can meet the needs of photovoltaic equipment under different operating conditions and reduce the vibration caused by external impacts such as wind vibration through the damper.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A damper for photovoltaic equipment, comprising an oil reservoir (1), a working cylinder (2), and a piston assembly, wherein the working cylinder (2) is disposed within the oil reservoir (1), and the piston assembly comprises a piston body (4) and a piston rod (3) reciprocatingly disposed within the working cylinder (2), a sealing piston (5) is fixedly disposed within one end of the oil reservoir (1), and one end of the piston rod (3) extends out of the oil reservoir (1) through the sealing piston (5), characterized in that: A sealing structure is provided between the sealing piston (5) and the oil storage cylinder (1). The sealing structure includes a plurality of first sealing rings (6) disposed between the outer wall of the sealing piston (5) and the inner wall of the oil storage cylinder (1), a limiting stop (11) folded and formed at the port of the oil storage cylinder and forming a limiting fit with the sealing piston (5), and at least one second sealing ring (7) disposed on one end face of the sealing piston (5) and pressed against the limiting stop (11).

2. The damper for a photovoltaic device according to claim 1, characterized by: The oil storage cylinder (1) is provided with a limiting recess (12) that presses against the other end of the sealing piston (5). Under the pressure of the limiting recess (12), the sealing piston (5) cooperates with the limiting stop (11) to press the second sealing ring (7).

3. The damper for a photovoltaic device according to claim 2, characterized by: The limiting recess (12) is an annular concave rib formed by pressing the side wall of the oil storage cylinder (1), and the other end of the sealing piston (5) is provided with a bevel structure that cooperates with and abuts against the annular protrusion.

4. The damper for a photovoltaic device according to claim 3, characterized by: One end of the oil reservoir (1) is provided with an opening surrounded by the limiting stop (11), and one end of the sealing piston (5) is provided with a protrusion (51) that matches and is accommodated in the opening, and a stepped portion (52) formed on the outside of the protrusion (51) and cooperating with the limiting stop (11). The second sealing ring (7) is embedded in the stepped portion (52) around the protrusion (51).

5. The damper for a photovoltaic device according to claim 4, characterized by: The stepped portion (52) is provided with a second annular groove (54) for installing the second sealing ring (7); the outer peripheral sidewall of the sealing piston (5) is provided with a plurality of first annular grooves (53) for installing a plurality of first sealing rings (6), and the plurality of first annular grooves (53) are distributed at intervals along the axial direction of the sealing piston (5).

6. Damper for photovoltaic devices according to any of claims 1-5, characterized in that: The other end of the oil storage cylinder (1) is equipped with a sealing cap (13). The oil storage cylinder (1) has an oil storage chamber (10). The working cylinder (2) has a working chamber (20). The piston body (4) is reciprocated in the working chamber (20). The right end of the working cylinder (2) near the sealing cap (13) is provided with a compensating bottom valve (8) for connecting the working chamber (20) and the oil storage chamber (10).

7. The damper for photovoltaic devices according to claim 6, characterized in that: The left end of the working cylinder (2) is provided with a plug (9) that is sealed to the sealing piston (5). The plug (9) and the sealing piston (5) are respectively provided with a central hole through which the piston rod (3) can pass. A third sealing ring (91) is provided at the central hole of the plug (9) to seal and contact the piston rod (3). At least one sealing element (55) that seals and contacts the piston rod is filled in the central hole of the sealing piston (5).

8. The damper for photovoltaic devices according to claim 1, characterized by: The piston rod (3) has a connecting rod at one end that passes through the sealing piston (5), and a locking nut (31) at the other end for fastening the piston body (4).

9. The damper for photovoltaic devices according to claim 8, characterized in that: The piston body (4) is provided with at least one oil-saving hole (41) penetrating through both sides, and two sets of elastic valve plates (42) are provided on both sides of the piston body to cooperate and block the two ends of the oil-saving hole (41). The diameter of the two ends of the oil-saving hole (41) is larger than the diameter of the middle end of the oil-saving hole (41).

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