Universal sealing structure for middle injection direct connection main shaft pull rod power assembly

Abstract

The invention relates to the technical field of loading and unloading engineering, in particular to a universal sealing structure for a middle-injection direct-connection main shaft pull rod power assembly, which comprises a sealing structure arranged at the connecting position of two connecting structures, and the connecting structures are pistons and cylinder bodies; the sealing structure comprises two annular sealing grooves formed in the cylinder body, and annular sealing rings and stepped rings which are arranged in the sealing grooves; the sealing groove is an annular concave area on the end face of the cylinder body, and the concave area forms a first sealing section and a second sealing section on the two sides of the positioning structure respectively; the outer side wall of the stepped ring is attached to the inner side of the sealing ring, and the inner side wall of the stepped ring is attached to the piston. The sealing ring is of a U-shaped structure with the two sides symmetrically arranged, a reserved groove is formed in the middle of the sealing ring and attached to the positioning structure of the sealing groove, outer lips on the two sides of the sealing ring are attached to the first sealing section and the second sealing section respectively, and an inner lip of the sealing ring is attached to the stepped ring. Bidirectional sealing is realized; the sealing performance is improved, and a good sealing state is kept all the time.

Description

Technical Field

[0001] The invention relates to the technical field of loading and unloading engineering, and in particular to a universal sealing structure for a central injection direct-connected main shaft pull rod power assembly. Background Art

[0002] In the hydraulic transmission system, the center injection direct-connected spindle tie rod power assembly is a key component, and its sealing performance directly affects the overall efficiency and stability of the system. Traditional sealing structures mostly use a single sealing ring or a simple sealing groove design to prevent the working medium (such as hydraulic oil) from leaking from the gap between the piston and the cylinder.

[0003] However, traditional seals are often difficult to maintain stable sealing effects under high pressure, high speed or extreme temperature changes due to limitations in material, structure or installation accuracy. In particular, during the reciprocating motion of the piston, the seal is prone to wear or deformation, resulting in seal failure. Summary of the invention

[0004] The present invention provides a universal sealing structure for a central injection direct-connected main shaft pull rod power assembly, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A universal sealing structure for a center jet direct-connected spindle pull rod power assembly includes a sealing structure arranged at a connection position of two connection structures, the connection structures are a piston and a cylinder body, and the two connection structures are arranged to slide relative to each other; The sealing structure comprises two annular sealing grooves arranged on the cylinder body, and annular sealing rings and step rings arranged in the sealing grooves; The sealing groove is a ring-shaped concave area on the end surface of the cylinder body, and a positioning structure that is a ring-shaped protrusion relative to the bottom surface of the concave area. The concave area forms a first sealing section and a second sealing section on both sides of the positioning structure, and the first sealing section and the second sealing section are arranged in a symmetrical structure; The outer wall of the step ring fits with the inner side of the sealing ring, and the inner wall of the step ring fits with the piston; The sealing ring is a U-shaped structure symmetrically arranged on both sides, and a reserved groove is provided in the middle, and the reserved groove fits with the positioning structure of the sealing groove, the outer lips on both sides of the sealing ring fit with the first sealing section and the second sealing section respectively, and the inner lip of the sealing ring fits with the step ring; Achieve two-way sealing.

[0006] Furthermore, the sealing ring is symmetrically provided with two inner cavities relative to the positioning structure. The two inner cavities are located inside the sealing ring, close to one side of the step ring, and retaining frames are provided in the inner cavities. The retaining frames have rotational elasticity and can push the inner lip to squeeze the inner wall of the step ring groove. One side of the retaining frame is inclined and the other side is vertical to adapt to different installation and force requirements.

[0007] Furthermore, outer edges are provided on both sides of the outer wall of the step ring, arc-shaped depressions are provided in the middle of the two outer edges, and a deformation gap is left between the outer edges and the inner lip. The left and right sides of the inner wall of the step ring are contact areas, and the middle depression is a deformation area. When the oil pressure increases, the step ring can deform and fit the outer wall of the piston better.

[0008] Furthermore, a cavity is formed between the retaining frame and the sealing ring, allowing the sealing ring to deform when subjected to force and squeeze the positioning structure and the arc-shaped recess to enhance the sealing performance.

[0009] Furthermore, a U-shaped groove is provided on the outer wall of the inner lip of the sealing ring, and a self-tightening spring is arranged in the U-shaped groove to provide additional sealing force and stability.

[0010] Furthermore, the surface of the sealing ring facing the step ring is an outwardly convex arc surface, which is used for positioning and enhancing the sealing contact area.

[0011] Furthermore, inclined groove walls are symmetrically arranged at both ends of the positioning structure, and a deformation cavity is arranged at the outer lip of the sealing ring corresponding to the inclined groove wall.

[0012] Furthermore, the retaining frame has sufficient tensile elasticity, allowing it to deform to a certain extent during installation and stress-bearing process, so as to facilitate assembly and maintain the sealing effect.

[0013] Furthermore, the inner lip of the sealing ring is thinner and the outer lip is thicker to optimize its deformation ability and sealing performance.

[0014] Furthermore, an arcuate groove wall is provided at the outer lip wall corresponding to the recessed area, and a convex edge is provided on the outer lip corresponding to the end of the arcuate groove wall. When the sealing ring is deformed by oil pressure, the outer lip and its convex edge fit with the arcuate groove wall to form a seal.

[0015] The technical solution of the present invention can achieve the following technical effects: A universal sealing structure for the center-jet direct-connected spindle tie rod power assembly is designed. When the piston reciprocates in the cylinder body, the outer lips on both sides of the sealing ring are in close contact with the first sealing section and the second sealing section respectively, forming an effective static and dynamic seal. No matter which direction the piston moves, the sealing ring can prevent the liquid from leaking from the gap between the cylinder body and the piston. The U-shaped structure of the sealing ring and the reserved groove design in the middle allow it to deform moderately under the action of oil pressure, so as to better fill the possible tiny gaps. At the same time, the presence of the step ring provides additional support for the sealing ring, especially in high-pressure environments, further improving the sealing performance and always maintaining a good sealing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a cross-sectional structural schematic diagram of a universal sealing structure for a center jet direct-connected main shaft tie rod power assembly in the present invention; Figure 2 It is a schematic diagram of the sealing ring structure of the universal sealing structure used for the central injection direct-connected main shaft tie rod power assembly in the present invention; Figure 3 It is a schematic diagram of a stepped ring structure of a universal sealing structure for a center jet direct-connected main shaft tie rod power assembly in the present invention; Figure 4 The invention is a universal sealing structure for the central injection direct-connected main shaft pull rod power assembly. Figure 1 A is a schematic diagram of the enlarged structure; Figure 5 The invention is a universal sealing structure for the central injection direct-connected main shaft pull rod power assembly. Figure 1 Schematic diagram of the sealing groove structure in the middle A part; Figure 6 The invention is a universal sealing structure for the central injection direct-connected main shaft pull rod power assembly. Figure 4 The enlarged structural diagram of the middle B part; Figure 7 The invention is a universal sealing structure for the central injection direct-connected main shaft pull rod power assembly. Figure 4 The enlarged structural diagram of the middle C part; Figure 8 The invention is a universal sealing structure for the central injection direct-connected main shaft pull rod power assembly. Figure 4 The enlarged structural diagram of the middle D part; Markings in the accompanying drawings: 1. piston; 2. cylinder body; 3. sealing groove; 32. positioning structure; 33. first sealing section; 34. second sealing section; 35. inclined groove wall; 36. arc-shaped groove wall; 4. sealing ring; 42. reserved groove; 43. outer lip; 44. inner lip; 45. inner cavity; 46. cavity; 47. U-shaped groove; 48. convex arc surface; 49. deformation cavity; 410. convex edge; 5. step ring; 51. outer edge; 52. gap; 53. contact area; 54. middle depression; 55. arc-shaped depression; 6. retaining frame; 61. inclined; 62. vertical; 7. self-tightening spring. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The present invention relates to a universal sealing structure for a central injection direct-connected spindle pull rod power assembly, such as Figures 1 to 8 As shown, it includes a sealing structure arranged at the connection position of two connection structures, the connection structure is a piston 1 and a cylinder body 2, and the two connection structures are arranged to slide relative to each other, and the piston 1 reciprocates in the cylinder body 2 to achieve functions such as compression and discharge of power transmission; The sealing structure includes two annular sealing grooves 3 arranged on the cylinder body 2, and annular sealing rings 4 and step rings 5 ​​arranged in the sealing grooves 3; The sealing groove 3 is a ring-shaped concave area on the end surface of the cylinder body 2, and a positioning structure 32 that is a ring-shaped protrusion relative to the bottom surface of the concave area. The positioning structure 32 is precisely processed to ensure that its surface is smooth and flawless to reduce friction and improve sealing performance. The concave area forms a first sealing section 33 and a second sealing section 34 on both sides of the positioning structure 32, and the first sealing section 33 and the second sealing section 34 are arranged in a symmetrical structure. The outer wall of the step ring 5 fits with the inner side of the sealing ring 4, and the inner wall of the step ring 5 fits with the piston 1; The sealing ring 4 is installed in the sealing groove 3 in an annular shape. The material with good elasticity and wear resistance is selected. The sealing ring 4 is a U-shaped structure symmetrically arranged on both sides, and a reserved groove 42 is provided in the middle. The reserved groove 42 is fitted with the positioning structure 32 of the sealing groove 3. The outer lips 43 on both sides of the sealing ring 4 are respectively fitted with the first sealing section 33 and the second sealing section 34 to achieve bidirectional sealing. The inner lip 44 of the sealing ring 4 is fitted with the step ring 5. When the piston 1 reciprocates in the cylinder body 2, the outer lips 43 on both sides of the sealing ring 4 are in close contact with the first sealing section 33 and the second sealing section 34 respectively, forming an effective static and dynamic seal. No matter in which direction the piston 1 moves, the sealing ring 4 can prevent the liquid from leaking from the gap between the cylinder body 2 and the piston 1. The U-shaped structure of the sealing ring 4 and the reserved groove 42 in the middle allow it to deform moderately under the action of oil pressure, so as to better fill the possible tiny gap. At the same time, the presence of the step ring 5 provides additional support for the sealing ring 4, especially in a high-pressure environment, further improving the sealing performance and always maintaining a good sealing state.

[0022] As a preferred solution, Figures 2 to 8 As shown, the sealing ring 4 is symmetrically provided with two inner cavities 45 relative to the positioning structure 32. The two inner cavities 45 are located inside the sealing ring 4, close to one side of the step ring 5, and a retainer 6 is provided in each of the inner cavities 45. The retainer 6 has rotational elasticity and can push the inner lip 44 to squeeze the inner side wall of the groove of the step ring 5. One side of the retainer 6 is inclined 61, and the other side is vertical 62, which can adapt to different installation and force requirements. The retainer 6 pushes the inner lip 44 of the sealing ring 4 through its elastic characteristics, so that the inner edge of the inner lip 44 fits tightly into the groove of the step ring 5. The retainer 6 can automatically adjust its position under different pressures to ensure the best sealing effect. The continuous thrust provided enables the sealing ring 4 to always maintain close contact under various working conditions, and can effectively prevent leakage even in high pressure or high temperature environments.

[0023] As a preferred solution, Figures 4 to 8 As shown, outer edges 51 are provided on both sides of the outer wall of the step ring 5, and the outer edges 51 increase the contact area between the step ring 5 and the sealing ring 4, and provide better positioning and support for the step ring 5. An arc-shaped depression 55 is provided in the middle of the two outer edges 51, and a deformable gap 52 is left between the outer edges 51 and the inner lip 44. The left and right sides of the inner wall of the step ring 5 are contact areas 53, which directly contact the outer wall of the piston 1 to form a tight sealing surface. The middle depression 54 is a deformation area. When the oil pressure increases, the step ring 5 can be deformed and better fit the outer wall of the piston 1. The deformation area of ​​the step ring 5 will deform moderately when the oil pressure increases, so that the step ring 5 can better fit the outer wall of the piston 1, especially under high-pressure conditions. This deformation enhances the sealing effect. The left and right outer edges 51 of the step ring 5 increase the contact area with the sealing ring 4, providing better support and positioning to prevent the step ring 5 from shifting under the action of oil pressure. The gap 52 between the outer edges 51 provides deformation space for the step ring 5, so that it can automatically adjust its position under different pressures to ensure the best sealing effect. The step ring 5 not only achieves reliable two-way sealing, but also has good adaptive deformation ability.

[0024] As a preferred solution, Figures 4 to 8 As shown, a cavity 46 is formed between the retainer 6 and the sealing ring 4. The size of the cavity 46 should be determined according to the expected maximum oil pressure, allowing the sealing ring 4 to deform and squeeze the positioning structure 32 and the arc-shaped recess 55 when subjected to force, so as to enhance the sealing performance; The cavity 46 between the retainer 6 and the sealing ring 4 provides a deformation space for the sealing ring 4, so that the sealing ring 4 can deform freely when subjected to force, avoiding material damage due to excessive compression. When oil enters the gap 52 between the sealing ring 4 and the step ring 5, the sealing ring 4 will be squeezed to be closer to the sealing section. At the same time, the deformation of the sealing ring 4 will squeeze the positioning structure 32 on the retainer 6 and the arc-shaped depression 55 in the groove of the step ring 5 to enhance the sealing effect.

[0025] As a preferred solution, Figures 4 to 8 As shown, the outer wall of the inner lip 44 of the sealing ring 4 is provided with a U-shaped groove 47, and the inner surface of the U-shaped groove 47 should be precisely processed to ensure smoothness and flawlessness to reduce friction. The setting of the U-shaped groove 47 does not affect the overall performance of the sealing ring 4, and a self-tightening spring 7 is arranged in the U-shaped groove 47. The self-tightening spring 7 has a certain pre-tightening force and can provide additional sealing force and stability under the action of oil pressure; The self-tightening spring 7 provides additional sealing force through its pre-tightening force, so that the inner lip 44 of the sealing ring 4 fits more closely to the inner wall of the groove of the step ring 5, thereby enhancing the sealing effect and preventing the sealing ring 4 from shifting or deforming under high pressure environment, thereby ensuring the long-term reliability of the sealing ring 4.

[0026] As a preferred solution, Figures 2 to 3 As shown, the surface of the sealing ring 4 facing the step ring 5 is an outer convex arc surface 48, which is used to more accurately position the sealing ring 4 and to position and enhance the sealing contact area. The curvature radius of the outer convex arc surface 48 should be optimized according to the shape of the step ring 5 to ensure a close fit between the two. The convex arc surface 48 provides a more precise positioning function, so that the sealing ring 4 can fit the inner wall of the step ring 5 more stably to prevent displacement under high pressure environment. The convex arc surface 48 increases the contact area between the sealing ring 4 and the step ring 5, thereby enhancing the sealing effect. The design of the convex arc surface 48 allows the sealing ring 4 to deform moderately when under pressure to better fill the possible tiny gaps.

[0027] As a preferred solution, Figures 4 to 8 As shown, inclined groove walls 35 are symmetrically arranged at both ends of the positioning structure 32 to increase the contact area between the positioning structure 32 and the sealing ring 4, and a deformation cavity 49 is arranged at the outer lip 43 of the sealing ring 4 corresponding to the inclined groove wall 35. The deformation cavity 49 allows the sealing ring 4 to deform appropriately when under pressure to better fill the possible tiny gap; The deformation cavity 49 at the outer lip 43 of the sealing ring 4 allows the sealing ring 4 to deform moderately when under pressure so as to better fill the possible tiny gaps, thereby enhancing the sealing performance. The combined design of the inclined groove wall and the deformation cavity 49 enables the sealing ring 4 to automatically adjust its position under different pressures to ensure the best sealing effect. Especially in a high-pressure environment, this design can effectively prevent liquid leakage.

[0028] As a preferred solution, Figures 2 to 8 As shown, the retainer 6 has sufficient tensile elasticity, allowing it to deform to a certain extent during installation and force application, which facilitates assembly and maintains the sealing effect; The tensile elastic design of the retaining frame 6 allows it to be deformed appropriately during the installation process, making it easier to accurately embed the retaining frame 6 into the inner cavity 45 of the sealing ring 4, thereby simplifying the assembly process.

[0029] As a preferred solution, Figures 2 to 8 As shown, the inner lip 44 of the sealing ring 4 is thinner and the outer lip 43 is thicker to optimize its deformation ability and sealing performance; The thinner design of the inner lip 44 allows it to deform moderately when under pressure, better filling any tiny gaps that may exist, thereby enhancing the sealing effect. The thicker design of the outer lip 43 provides a larger contact area and supporting force, ensuring that the sealing ring 4 can withstand higher pressures while maintaining good sealing performance. This design improves the overall strength and stability of the sealing ring 4 and prevents displacement or deformation under high-pressure environments.

[0030] As a preferred solution, Figures 4 to 8As shown, an arcuate groove wall 36 is provided at the wall of the outer lip 43 corresponding to the concave area, and the curvature radius of the arcuate groove wall 36 is optimized according to the shape of the outer lip 43 of the sealing ring 4. These arcuate groove walls 36 are designed to guide the outer lip 43 of the sealing ring 4 and provide a better contact area, providing an extra layer of sealing area, and a convex edge 410 is provided on the outer lip 43 at the end corresponding to the arcuate groove wall 36. When the sealing ring 4 is deformed by oil pressure, the outer lip 43 and its convex edge 410 fit with the arcuate groove wall 36 to form a seal; The convex edge 410 on the outer lip 43 of the sealing ring 4 allows the sealing ring 4 to deform moderately when under pressure to better fill the arc groove wall 36. At the same time, the arc groove wall 36 and the convex edge 410 are designed to guide and buffer to avoid direct impact on the joint between the sealing ring 4 and the positioning structure 32 to enhance the sealing effect.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A universal sealing structure for a central injection direct-connected spindle tie rod power assembly, characterized in that: It comprises a sealing structure arranged at the connection position of two connection structures, the connection structures are a piston (1) and a cylinder body (2), and the two connection structures are arranged to slide relative to each other; The sealing structure comprises two annular sealing grooves (3) arranged on the cylinder body (2), and annular sealing rings (4) and a stepped ring (5) arranged in the sealing grooves (3); The sealing groove (3) is an annular recessed area on the end surface of the cylinder body (2), and a positioning structure (32) that is annularly protruding relative to the bottom surface of the recessed area, the recessed area forms a first sealing section (33) and a second sealing section (34) on both sides of the positioning structure (32), and the first sealing section (33) and the second sealing section (34) are arranged in a symmetrical structure; The outer wall of the step ring (5) is in contact with the inner side of the sealing ring (4), and the inner wall of the step ring (5) is in contact with the piston (1); The sealing ring (4) is a U-shaped structure symmetrically arranged on both sides, and a reserved groove (42) is provided in the middle, the reserved groove (42) is fitted with the positioning structure (32) of the sealing groove (3), the outer lips (43) on both sides of the sealing ring (4) are respectively fitted with the first sealing section (33) and the second sealing section (34) to achieve bidirectional sealing, and the inner lip (44) of the sealing ring (4) is fitted with the step ring (5).

2. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 1, characterized in that: The outer wall of the step ring (5) is provided with outer edges (51) on both sides, and arc-shaped depressions (55) are provided in the middle of the two outer edges (51). A deformation gap (52) is left between the outer edges (51) and the inner lip (44). The inner wall of the step ring (5) is provided with contact areas (53) on both sides, and the middle depression (54) is provided with a deformation area. When the oil pressure increases, the step ring (5) can be deformed and better fit the outer wall of the piston (1).

3. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 2, characterized in that: The sealing ring (4) is symmetrically provided with two inner cavities (45) relative to the positioning structure (32). The two inner cavities (45) are located inside the sealing ring (4) and close to one side of the step ring (5). A retaining frame (6) is provided in each of the inner cavities (45). The retaining frame (6) has rotational elasticity and can push the inner lip (44) to squeeze the inner side wall of the step ring (5) groove. One side of the retaining frame (6) is inclined (61) and the other side is vertical (62) to adapt to different installation and force requirements.

4. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly as claimed in claim 3, characterized in that: A cavity (46) is formed between the retaining frame (6) and the sealing ring (4), allowing the sealing ring (4) to deform when subjected to force and to squeeze the positioning structure (32) and the arc-shaped recess (55), thereby enhancing the sealing performance.

5. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly as claimed in claim 3, characterized in that: The retaining frame (6) has sufficient tensile elasticity, allowing it to deform to a certain extent during installation and stress-bearing processes.

6. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 1, characterized in that: The outer wall of the inner lip (44) of the sealing ring (4) is provided with a U-shaped groove (47), and a self-tightening spring (7) is arranged in the U-shaped groove (47) to provide additional sealing force and stability.

7. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 1, characterized in that: The surface of the sealing ring (4) facing the step ring (5) is an outwardly convex arc surface (48) for positioning and increasing the sealing contact area.

8. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 1, characterized in that: Inclined groove walls (35) are symmetrically arranged at both ends of the positioning structure (32), and a deformation cavity (49) is arranged at the outer lip (43) of the sealing ring (4) corresponding to the inclined groove wall (35).

9. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 1, characterized in that: The inner lip (44) of the sealing ring (4) is relatively thin, and the outer lip (43) is relatively thick.

10. The universal sealing structure for the central injection direct-connected main shaft tie rod power assembly according to claim 1, characterized in that: An arcuate groove wall (36) is provided at a portion of the recessed area corresponding to the wall of the outer lip (43), and a convex edge (410) is provided on the outer lip (43) at the end corresponding to the arcuate groove wall (36); when the sealing ring (4) is deformed by oil pressure, the outer lip (43) and its convex edge (410) fit with the arcuate groove wall (36) to form a seal.

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