Three-dimensional sealing structure and swing oil cylinder

Abstract

The problems that in an existing swing oil cylinder, the dynamic sealing effect on a rotating shaft is poor, and internal leakage is likely to happen are solved. The three-dimensional sealing structure and the swing oil cylinder are provided, and the three-dimensional sealing structure comprises an annular groove, a first sealing ring, a second sealing ring and a third sealing ring; wherein the first sealing ring is an O-shaped sealing ring, and the first sealing ring is arranged at the bottom in the annular groove; the second sealing ring and the third sealing ring are also arranged in the annular groove, and the second sealing ring and the third sealing ring are matched through inclined plane attachment; the lower portion of the second sealing ring makes contact with the first sealing ring, and the first sealing ring is pre-pressed. And axial and radial load pressure is generated, so that the sealing is more effective and reliable.

Description

Technical Field

[0001] This invention relates to the field of sealing ring technology, and in particular to a three-dimensional sealing structure and a swing cylinder. Background Technology

[0002] In some moving parts, dynamic sealing has always been a major problem affecting the overall sealing effect. For example, in a swing cylinder, due to the rotation of the shaft, the contact area between the shaft and the outer shell cannot achieve effective sealing, resulting in a large internal leakage flow in actual operation. This affects the oil pressure in the two chambers inside the swing cylinder and reduces operating efficiency. In traditional sealing methods, most use a simple mating method of two sealing rings, pressing one sealing ring on top of another O-ring to achieve overall sealing, such as the technical solution shown in the patent with authorization publication number CN216382563U. However, in this sealing method, because the two sides of the sealing ring that abuts against the O-ring deform under oil pressure, the two chambers inside the swing cylinder can connect, affecting the overall sealing effect. Therefore, a three-dimensional sealing structure and a swing cylinder that can effectively prevent internal and external leakage of hydraulic oil are needed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-dimensional sealing structure and a swing cylinder.

[0004] To solve the above problems, the present invention adopts the following technical solution: A three-dimensional sealing structure includes an annular groove, a first sealing ring, a second sealing ring, and a third sealing ring; wherein the first sealing ring is an O-ring and is disposed at the bottom of the annular groove; the second and third sealing rings are also disposed in the annular groove, and the second and third sealing rings are fitted together by inclined surfaces; the lower part of the second sealing ring contacts the first sealing ring and pre-compresses the first sealing ring.

[0005] Furthermore, the inner wall of the annular groove is in contact with the side of the second sealing ring; the outer wall of the annular groove is in contact with the side of the third sealing ring.

[0006] Furthermore, the inclined surface on the second sealing ring slopes downwards from the inside to the outside; the inclined surface on the third sealing ring slopes downwards from the inside to the outside.

[0007] Furthermore, the upper surface of the third sealing ring is a ring-shaped plane, the lower surface of the third sealing ring is an inclined surface that contacts the second sealing ring, and the inner surface of the third sealing ring is a vertical surface with a set height.

[0008] Furthermore, the upper surface of the second sealing ring is an inclined surface that contacts the third sealing ring, the lower surface of the second sealing ring is a ring-shaped plane or an inwardly concave arc surface that contacts the first sealing ring, and the outer surface of the second sealing ring is a vertical surface of a set height.

[0009] A swing cylinder includes the aforementioned three-dimensional sealing structure, and further includes a rotating shaft, a fixed blade, a movable blade, and a housing; wherein the housing is provided with an oil cavity for accommodating the movable blade and the fixed blade; the rotating shaft passes through the oil cavity and rotates and is sealed to the housing; the fixed blade is fixedly connected to the housing, and the movable blade is fixedly connected to the rotating shaft; a first chamber and a second chamber are formed between the two ends of the fixed blade and the two ends of the movable blade, and oil inlet and outlet passages corresponding to the first chamber and the second chamber are respectively provided on the rotating shaft; the three-dimensional sealing structure is disposed between the rotating shaft and the housing, the first sealing ring in the three-dimensional sealing structure is located in an annular groove provided on the housing, and the third sealing ring in the three-dimensional sealing structure abuts against the rotating shaft.

[0010] Furthermore, the outer shell comprises an upper shell and a lower shell, which are fitted together and fixedly connected by bolts; a hollow oil cavity is formed on the mating surface of the upper and lower shells; a cylindrical part with a larger diameter is provided in the middle part of the rotating shaft, the upper edge of the cylindrical part abutting against the upper shell, and the lower edge of the cylindrical part abutting against the lower shell; a three-dimensional sealing structure is provided at the contact points between the upper and lower shells and the cylindrical part of the rotating shaft, and the three-dimensional sealing structure is respectively provided on the upper shell and the lower shell.

[0011] Furthermore, the fixed blade is configured as a plane on both sides near the first and second chambers, and the moving blade is also configured as a plane on both sides; when rotated to the limit angle, the plane on one side of the fixed blade fits into the plane on the corresponding side of the moving blade; the interface positions of the oil inlet and outlet passages on the rotating shaft that connect to the first and second chambers are located on both sides of the moving blade in the chambers; and the fixed blade is also provided with recessed oil grooves corresponding to the oil inlet and outlet passages on both sides, and when the moving blade and the fixed blade fit together, one end of one of the oil inlet and outlet passages pointing to the chamber is located in the oil groove.

[0012] Furthermore, the two oil inlet and outlet passages on the rotating shaft are respectively connected to both ends of the rotating shaft.

[0013] Furthermore, one end of the rotating shaft is configured as a transmission tooth for connection with an external joint; the other end of the rotating shaft is provided with an annular conductive plate, which is fixedly installed in a groove on the outer casing, with the rotating shaft located inside the conductive plate; an electric slip ring is provided on the conductive plate, which cooperates with the brush on the rotating shaft; the conductive plate is also electrically connected to a servo valve on the side of the outer casing through a conductive channel provided inside the outer casing; several oil supply passages for supplying oil to other external joints are also provided inside the rotating shaft, with one end of the oil supply passage located at the end of the rotating shaft and the other end connected to the side of the rotating shaft; an oil ring is provided inside the outer casing corresponding to the end hole of the oil supply passage on the side of the rotating shaft; the oil ring is also connected to a servo valve fixedly connected to the side of the outer casing through a passage provided inside the outer casing.

[0014] The beneficial effects of this invention are as follows: By setting the initial preload of the first sealing ring to ensure the initial sealing pressure, and combining the inclined surface fit between the second and third sealing rings, axial and radial load pressures are generated, making the seal more effective and reliable. By setting a three-dimensional sealing structure inside the cylinder, when leakage occurs due to shaft rotation, the leaked hydraulic oil enters the annular groove and squeezes the first sealing ring, thereby lifting the second and third sealing rings, achieving a stronger sealing pressure, preventing internal and external leakage, and maintaining an effective seal. By setting up oil supply passages and other structures inside the shaft, the external oil circuit connection is simplified, and the oil circuit is integrated into the inside of the shaft, which facilitates the movement of external joints. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall hydraulic cylinder in Example 1; Figure 2 This is an exploded view of the hydraulic cylinder in Example 1; Figure 3 This is a schematic diagram of the three-dimensional sealing structure of Example 1; Figure 4 This is a three-dimensional sectional view of the sealing structure of Example 1; Figure 5 for Figure 4 A magnified view of a portion of region a; Figure 6 This is a schematic diagram of the rotating shaft in Example 1; Figure 7 This is a perspective view of the internal passage of the hydraulic cylinder behind the hidden blades in Example 1.

[0016] Explanation of the symbols in the attached diagram: 1. Annular groove; 2. First sealing ring; 3. Second sealing ring; 4. Third sealing ring; 5. Rotating shaft; 51. Oil inlet / outlet passage; 52. Columnar part; 53. Oil supply passage; 6. Fixed blade; 61. Oil groove; 7. Moving blade; 8. Outer shell; 81. Upper shell; 82. Lower shell; 9. Conductive plate; 91. Electric slip ring; 10. Electric brush. Detailed Implementation

[0017] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the figures only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Example 1: like Figures 1-7As shown, a three-dimensional sealing structure includes an annular groove 1, a first sealing ring 2, a second sealing ring 3, and a third sealing ring 4. The first sealing ring 2 is an O-ring and is located at the bottom of the annular groove 1. The second sealing ring 3 and the third sealing ring 4 are also located within the annular groove 1, and are fitted together by inclined surfaces. The lower part of the second sealing ring 3 contacts the first sealing ring 2 and pre-compresses it, ensuring that the first sealing ring 2 always exerts an upward elastic force on the second sealing ring 3. Combined with the inclined surface fit between the second sealing ring 3 and the third sealing ring 4, the second sealing ring 3 and the third sealing ring 4 are respectively pushed towards both sides of the annular groove 1, thereby ensuring a sealing effect. Furthermore, even if hydraulic oil enters the annular groove 1, it will press downwards against the third sealing ring 4. Combined with the fit between the third sealing ring 4 and the second sealing ring 3, this will push both rings towards the sides of the annular groove 1. This utilizes the hydraulic oil's own pressure to generate axial and radial load pressure, achieving higher contact stress on the seals, ensuring a sealing effect, and preventing hydraulic oil leakage to the outside or internal leakage. In this example, the third sealing ring 4 is made of wear-resistant but slightly less elastic rubber, while the second sealing ring 3 is made of a hard sealing material to reduce deformation and ensure a sloped contact relationship with the third sealing ring, providing a stable directional reaction force. The first sealing ring 2 is made of silicone with strong elastic deformation capability. This allows the surface-mounted third sealing ring 4 to have a longer service life. Additionally, the first sealing ring 2 at the bottom of the annular groove 1 deforms under pressure, generating a reaction force on the second sealing ring 3, ensuring a tight fit between the second sealing ring and the inner edge of the annular groove. The third sealing ring 4 and... The tight fit of the outer edge makes the seal between the sealing ring and the two sides of the annular groove more effective and reliable. More importantly, in actual use, if leakage occurs, the hydraulic oil will enter the area below the second sealing ring in the annular groove along the edge of the third sealing ring. At this time, due to the high pressure of the hydraulic oil, it will squeeze the first sealing ring from the side. After being squeezed, the first sealing ring will push the second sealing ring upward. The third sealing ring, which is in contact with the inclined surface of the second sealing ring, will be subjected to the inclined reaction force of the second sealing ring. This will make the sealing effect between the third sealing ring and the side of the annular groove and the contact surface between the third sealing ring and the upper surface of the third sealing ring better, achieving a three-dimensional sealing effect and preventing hydraulic oil leakage.

[0020] The annular groove 1 has a square structure. In this example, the inner wall of the annular groove 1 is in contact with the side of the second sealing ring 3; the outer wall of the annular groove 1 is in contact with the side of the third sealing ring 4; the inclined surface on the second sealing ring 3 slopes downwards from the inside to the outside; the inclined surface on the third sealing ring 4 slopes downwards from the inside to the outside. This means that when subjected to force, the second sealing ring 3 will be pressed against the inner wall of the annular groove 1, and the third sealing ring 4 will be pressed against the outer wall of the annular groove 1. It should be noted that the first sealing ring 2 is located at the bottom of the annular groove 1 near the inner wall. This creates a space between the outer side of the bottom of the annular groove and the first sealing ring 2 that can accommodate a certain amount of hydraulic oil, allowing hydraulic oil leaking in from near the outer side of the annular groove to enter this space and compress the first sealing ring 2.

[0021] The upper surface of the third sealing ring 4 is a ring-shaped plane, the lower surface of the third sealing ring 4 is an inclined surface that contacts the second sealing ring 3, and the inner surface of the third sealing ring 4 is a vertical surface of a set height; the upper surface of the second sealing ring 3 is an inclined surface that contacts the third sealing ring 4; the lower surface of the second sealing ring 3 is a ring-shaped plane or an inwardly concave arc surface that contacts the first sealing ring 2, and the lower surface of the second sealing ring 3 contacts the first sealing ring 2; the outer surface of the second sealing ring 3 is a vertical surface of a set height.

[0022] A swing cylinder includes the aforementioned three-dimensional sealing structure, and further includes a rotating shaft 5, a fixed blade 6, a movable blade 7, and a housing 8. The housing 8 contains an oil cavity for accommodating the movable blade 7 and the fixed blade 6. The rotating shaft 5 passes through the oil cavity and is rotatably and sealingly connected to the housing 8. The fixed blade 6 is fixedly connected to the housing 8, and the movable blade 7 is fixedly connected to the rotating shaft 5. A first chamber and a second chamber are formed between the two ends of the fixed blade 6 and the two ends of the movable blade 7. Oil inlet and outlet passages 51, corresponding to the first and second chambers, are respectively provided on the rotating shaft 5 to control the oil pressure in the first and second chambers, thereby driving the movable blade 7 to rotate the rotating shaft 5. The three-dimensional sealing structure is located between the rotating shaft 5 and the housing 8. Between the shells 8, the first sealing ring 2 in the three-dimensional sealing structure is located in the annular groove 1 set on the shell 8, and the third sealing ring 4 in the three-dimensional sealing structure abuts against the rotating shaft 5. When the rotating shaft 5 rotates, some hydraulic oil in the chamber will leak into the annular groove 1 and squeeze the first sealing ring 2. After being squeezed laterally, the first sealing ring 2 deforms and pushes the second sealing ring 3 upward. The way the third sealing ring 4 and the second sealing ring 3 cooperate causes the second sealing ring 3 and the third sealing ring 4 to squeeze towards both sides of the annular groove 1 respectively. In addition, the third sealing ring 4 will also squeeze the shell it cooperates with upward to further seal, preventing the internal and external leakage of hydraulic oil and achieving the effect of three-dimensional sealing.

[0023] The outer casing 8 comprises an upper casing 81 and a lower casing 82. The upper casing 81 and the lower casing 82 are fitted together and fixedly connected by bolts. In this example, the bolts are inserted into the upper casing 81, pass through the threaded holes provided on the upper casing 81 and the lower casing 82, and are engaged with each other. A hollow oil cavity is formed on the mating surface of the upper casing 81 and the lower casing 82. The fixed blade 6, the moving blade 7, and the middle part of the rotating shaft 5 are respectively accommodated in the oil cavity. A cylindrical part 52 with a larger diameter is provided in the middle part of the rotating shaft 5. The upper edge of the cylindrical part 52 abuts against the upper casing 81, and the lower edge of the cylindrical part 52 abuts against the lower casing 82. A three-dimensional sealing structure is provided at the contact points between the upper casing 81 and the lower casing 82 and the cylindrical part 52 of the rotating shaft 5. The three-dimensional sealing structure is respectively provided on the upper casing 81 and the lower casing 82. The third sealing ring 4 in the three-dimensional sealing structure contacts the upper and lower edges of the cylindrical part 52 of the rotating shaft 5 and performs a frictional sealing engagement with the edge of the cylindrical part 52 of the rotating shaft 5.

[0024] The fixed blade 6 is set as a plane on both sides near the first chamber and the second chamber, and the moving blade 7 is also set as a plane on both sides. When rotated to the limit angle, the plane on one side of the fixed blade 6 is in contact with the plane on the corresponding side of the moving blade 7, so that the rotation angle range of the rotating shaft 5 is larger. The oil inlet and outlet passages 51 on the rotating shaft 5 that connect to the first chamber and the second chamber are located on both sides of the moving blade 7 in the chamber. On both sides of the fixed blade 6, there are also recessed oil grooves 61 corresponding to the oil inlet and outlet passages 51. When the moving blade 7 and the fixed blade 6 are in contact, the end of one of the oil inlet and outlet passages 51 pointing to the chamber is located in the oil groove 61. In this way, even when the fixed blade 6 is in contact with one edge of the moving blade 7, the oil inlet and outlet passages 51 will not be blocked, and the communication with the first chamber and the second chamber can be maintained.

[0025] The two oil inlet and outlet passages 51 on the rotating shaft 5 are respectively connected to both ends of the rotating shaft 5. In this example, the oil inlet and outlet passages 51 at both ends of the rotating shaft 5 are also connected to external oil supply equipment through pipes to achieve oil supply.

[0026] One end of the rotating shaft 5 is configured as a transmission tooth for connection with an external joint transmission; the other end of the rotating shaft 5 is provided with an annular conductive plate 9, which is fixedly installed in a groove on the outer casing 8, with the rotating shaft 5 located inside the conductive plate 9; an electric slip ring 91 is provided on the conductive plate 9, which cooperates with the electric brush 10 provided on the rotating shaft 5; the conductive plate 9 is also electrically connected to the servo valve provided on the side of the outer casing 8 through a conductive channel provided inside the outer casing 8, ensuring stable power supply to the servo valve; several external power supply terminals are also provided inside the rotating shaft 5. The oil supply passage 53 supplies oil to the joint. One end of the oil supply passage 53 is located at the end of the rotating shaft 5, and the other end of the oil supply passage 53 is connected to the side of the rotating shaft 5. An oil ring is provided inside the housing 8, which corresponds to the end hole of the oil supply passage 53 on the side of the rotating shaft 5. The oil ring is also connected to a servo valve fixedly connected to the side of the housing 8 through a passage provided inside the housing 8. The servo valve leads the hydraulic oil stored in the oil ring to other joint parts, integrating the connected oil circuit into the rotating shaft 5 to avoid external oil circuits affecting the sealing or interfering with the mechanical movement.

[0027] The above description is merely a specific example of the present invention and does not constitute any limitation on the present invention. Obviously, those skilled in the art, after understanding the content and principles of the present invention, may make various modifications and changes in form and detail without departing from the principles and structure of the present invention; however, these modifications and changes based on the spirit of the present invention are still within the scope of protection of the claims of the present invention.

Claims

1. A three-dimensional sealing structure, characterized by, The sealing structure comprises a ring groove (1), a first sealing ring (2), a second sealing ring (3) and a third sealing ring (4); the first sealing ring (2) is an O-shaped sealing ring, and is arranged at the bottom of the ring groove (1); the second sealing ring (3) and the third sealing ring (4) are also arranged in the ring groove (1), and the second sealing ring (3) and the third sealing ring (4) are matched through the inclined surface; the lower part of the second sealing ring (3) is in contact with the first sealing ring (2) and pre-presses the first sealing ring (2).

2. A three-dimensional sealing structure according to claim 1, wherein The inner side wall of the ring groove (1) is in contact with the side surface of the second sealing ring (3); and the outer side wall of the ring groove (1) is in contact with the side surface of the third sealing ring (4).

3. A three-dimensional sealing structure according to claim 2, wherein The inclined surface of the second sealing ring (3) is inclined from the upper part to the lower part in the direction from the inner side to the outer side; and the inclined surface of the third sealing ring (4) is inclined from the upper part to the lower part in the direction from the inner side to the outer side.

4. A three-dimensional sealing structure according to claim 3, wherein The upper surface of the third sealing ring (4) is a ring-shaped plane, the lower surface of the third sealing ring (4) is an inclined surface in contact with the second sealing ring (3), and the inner side surface of the third sealing ring (4) is a vertical surface with a set height.

5. The three-dimensional sealing structure according to claim 3, wherein The upper surface of the second sealing ring (3) is an inclined surface in contact with the third sealing ring (4), the lower surface of the second sealing ring (3) is a ring-shaped plane or an inwardly concave arc surface in contact with the first sealing ring (2), and the outer side surface of the second sealing ring (3) is a vertical surface with a set height.

6. A swing cylinder characterized by The sealing structure comprises a ring groove (1), a first sealing ring (2), a second sealing ring (3) and a third sealing ring (4); the first sealing ring (2) is an O-shaped sealing ring, and is arranged at the bottom of the ring groove (1); the second sealing ring (3) and the third sealing ring (4) are also arranged in the ring groove (1), and the second sealing ring (3) and the third sealing ring (4) are matched through the inclined surface; the lower part of the second sealing ring (3) is in contact with the first sealing ring (2) and pre-presses the first sealing ring (2).

7. A swing cylinder as claimed in claim 6, characterized in that The outer shell (8) comprises an upper shell (81) and a lower shell (82), the upper shell (81) and the lower shell (82) are in contact and are fixedly connected through bolts; a hollow oil cavity is formed on the contact surface of the upper shell (81) and the lower shell (82); the middle part of the rotating shaft (5) is provided with a cylindrical part (52) with a larger diameter, the upper end edge of the cylindrical part (52) abuts against the upper shell (81), and the lower end edge of the cylindrical part (52) abuts against the lower shell (82); the three-dimensional sealing structure is arranged on the contact part of the upper shell (81) and the lower shell (82) and the cylindrical part (52) of the rotating shaft (5), and is arranged on the upper shell (81) and the lower shell (82) respectively.

8. The swing cylinder of claim 6 wherein, The fixed blade (6) is provided with a plane on each side close to the first chamber and the second chamber, and the moving blade (7) is also provided with a plane on each side; when rotated to the limit angle, the plane on one side of the fixed blade (6) is attached to the plane on the corresponding side of the moving blade (7); the interfaces of the oil inlet and outlet passages (51) on the rotating shaft (5) which are communicated to the first chamber and the second chamber are located on each side of the moving blade (7) in the chamber; the recessed oil groove (61) corresponding to the oil inlet and outlet passage (51) is further provided on each side of the fixed blade (6), and when the moving blade (7) and the fixed blade (6) are attached, one end of the oil inlet and outlet passage (51) pointing to the chamber is located in the oil groove (61).

9. The swing cylinder of claim 6 wherein, The two oil inlet and outlet passages (51) on the rotating shaft (5) are respectively communicated to the two ends of the rotating shaft (5).

10. A swing cylinder as claimed in claim 9, characterized in that One end of the rotating shaft (5) is provided with a driving tooth shape connected to the joint transmission outside; the other end of the rotating shaft (5) is provided with an annular conductive plate (9), the conductive plate (9) is fixedly arranged in the groove on the shell (8), and the rotating shaft (5) is located on the inner side of the conductive plate (9); the conductive plate (9) is provided with an electric slip ring (91), the electric slip ring (91) is matched with the brush (10) arranged on the rotating shaft (5); the conductive plate (9) is further electrically connected with the servo valve arranged on the side of the shell (8) through the conductive channel arranged inside the shell (8); a plurality of oil supply passages (53) for supplying oil to other joints outside are further arranged inside the rotating shaft (5), one end of the oil supply passage (53) is located at the end of the rotating shaft (5), the other end of the oil supply passage (53) is connected to the side of the rotating shaft (5), and an oil ring corresponding to the end hole of the oil supply passage (53) on the side of the rotating shaft (5) is arranged inside the shell (8); the oil ring is further connected with the servo valve fixedly connected to the side of the shell (8) through the passage arranged inside the shell (8).

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