General sealing structure for the pull rod power assembly of the middle spray direct connection main shaft

Abstract

The present invention relates to the technical field of unloading engineering, and particularly to a general sealing structure for a medium-injection direct-connected main shaft pull rod power assembly, including a sealing structure arranged at the connection position of two connection structures, where the connection structures are a piston and a cylinder block; the sealing structure includes two annular sealing grooves arranged on the cylinder block, and an annular sealing ring and a stepped ring arranged in the sealing grooves; the sealing grooves are annular recessed areas on the end face of the cylinder block, and the recessed areas respectively form a first sealing section and a second sealing section on both sides of the positioning structure; 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 a U-shaped structure symmetrically arranged on both sides, and a reserved groove is provided in the middle, and the reserved groove is attached to the positioning structure of the sealing groove. The outer lips on both sides of the sealing ring are respectively attached to the first sealing section and the second sealing section, and the inner lip of the sealing ring is attached to the stepped ring; two-way sealing is achieved; the sealing performance is improved, and a good sealing state is always maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of handling engineering, and particularly relates to a universal sealing structure for a medium-injection direct-coupled main shaft pull rod power assembly. Background Art

[0002] In a hydraulic transmission system, as a key component, the sealing performance of the medium-injection direct-coupled main shaft pull rod power assembly directly affects the overall efficiency and stability of the system. Traditional sealing structures mostly adopt a single sealing ring or a simple sealing groove design to prevent the working medium (such as hydraulic oil) from leaking through the gap between the piston and the cylinder block.

[0003] However, due to limitations in materials, structure, or installation accuracy, traditional sealing rings are difficult to maintain a stable sealing effect under high pressure, high speed, or extreme temperature change conditions. Especially during the reciprocating movement of the piston, the sealing ring is prone to wear or deformation, resulting in sealing failure. Summary of the Invention

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

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A universal sealing structure for a medium-injection direct-coupled main shaft pull rod power assembly, including a sealing structure disposed at the connection position of two connection structures. The connection structures are a piston and a cylinder block, and the two connection structures are relatively slidably disposed;

[0007] The sealing structure includes two annular sealing grooves disposed on the cylinder block, and an annular sealing ring and a stepped ring disposed in the sealing grooves;

[0008] The sealing groove is an annular recessed area on the end face of the cylinder block and a positioning structure that is annularly convex with respect to the bottom surface of the recessed area. The recessed 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 symmetrically arranged;

[0009] 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;

[0010] The sealing ring is a U-shaped structure symmetrically arranged on both sides, and a reserved groove is provided in the middle. The reserved groove is attached to the positioning structure of the sealing groove. The outer lips on both sides of the sealing ring are respectively attached to the first sealing section and the second sealing section, and the inner lip of the sealing ring is attached to the stepped ring;

[0011] Realize two-way sealing.

[0012] Further, two inner cavities are symmetrically arranged with respect to the positioning structure on the sealing ring. The two inner cavities are located inside the sealing ring, close to the stepped ring side, and cage is arranged in each inner cavity. The cage has rotational elasticity and can push the inner lip to press against the inner side wall of the stepped ring groove. One side of the cage is inclined and the other side is vertical to adapt to different installation and force requirements.

[0013] Further, outer edges are arranged on both the left and right sides of the outer wall of the stepped ring. An arc-shaped depression is arranged in the middle of the two outer edges, and a deformation gap is left between the outer edge and the inner lip. The left and right sides of the inner wall of the stepped ring are contact areas, and the middle depression is a deformation area. When the oil pressure increases, the stepped ring can deform and better fit the outer wall of the piston.

[0014] Further, a cavity is formed between the cage and the sealing ring, allowing the sealing ring to deform under force and press against the positioning structure and the arc-shaped depression to enhance the sealing performance.

[0015] Further, a U-shaped groove is formed 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.

[0016] Further, the surface of the sealing ring facing the stepped ring is a convex arc surface for positioning and enhancing the sealing contact area.

[0017] Further, 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.

[0018] Further, the cage has sufficient tensile elasticity, allowing it to deform to a certain extent during installation and under force, facilitating assembly and maintaining the sealing effect.

[0019] Further, the inner lip of the sealing ring is thinner and the outer lip is thicker to optimize its deformation ability and sealing performance.

[0020] Further, an arc-shaped groove wall is arranged at the outer lip wall corresponding to the depression area, and a convex edge is arranged on the outer lip at the corresponding end of the arc-shaped groove wall. When the sealing ring deforms under oil pressure, the outer lip and its convex edge fit against the arc-shaped groove wall to form a seal.

[0021] Through the technical solution of the present invention, the following technical effects can be achieved:

[0022] By designing a general sealing structure for the medium-injection direct-coupled main shaft pull rod power assembly, when the piston reciprocates in the cylinder block, 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 effective static and dynamic seals. No matter which direction the piston moves, the sealing ring can prevent liquid from leaking through the gap between the cylinder block 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 stepped ring provides additional supporting force for the sealing ring, especially in a high-pressure environment, further improving the sealing performance and always maintaining a good sealing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the general sealing structure for the medium-injection direct-coupled main shaft pull rod power assembly in the present invention;

[0025] Figure 2 It is a schematic structure diagram of the sealing ring of the general sealing structure for the medium-injection direct-coupled main shaft pull rod power assembly in the present invention;

[0026] Figure 3 It is a schematic structure diagram of the stepped ring of the general sealing structure for the medium-injection direct-coupled main shaft pull rod power assembly in the present invention;

[0027] Figure 4 It is for the general sealing structure of the medium-injection direct-coupled main shaft pull rod power assembly in the present invention Figure 1 Schematic enlarged structure diagram of part A;

[0028] Figure 5 It is for the general sealing structure of the medium-injection direct-coupled main shaft pull rod power assembly in the present invention Figure 1 Schematic structure diagram of the sealing groove of part A;

[0029] Figure 6 It is for the general sealing structure of the medium-injection direct-coupled main shaft pull rod power assembly in the present invention Figure 4 Schematic enlarged structure diagram of part B;

[0030] Figure 7 It is for the general sealing structure of the medium-injection direct-coupled main shaft pull rod power assembly in the present invention Figure 4 Schematic enlarged structure diagram of part C;

[0031] Figure 8 For the general sealing structure of the middle injection direct connection main shaft pull rod power component in the present invention Figure 4 Schematic enlarged structure diagram of part D in the middle;

[0032] Reference signs in the drawings: 1, piston; 2, cylinder block; 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, stepped ring; 51, outer edge; 52, gap; 53, contact area; 54, middle depression; 55, arc-shaped depression; 6, cage; 61, inclination; 62, vertical; 7, self-tightening spring. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] The present invention relates to a general sealing structure for a middle injection direct connection main shaft pull rod power component, as Figures 1 to 8 shown, including a sealing structure arranged at the connection position of two connection structures. The connection structures are a piston 1 and a cylinder block 2, and the two connection structures are arranged to slide relative to each other. The piston 1 reciprocates in the cylinder block 2 to realize functions such as compression and discharge of power transmission;

[0037] The sealing structure includes two annular sealing grooves 3 provided on the cylinder block 2, and an annular sealing ring 4 and a stepped ring 5 provided in the sealing grooves 3;

[0038] The sealing groove 3 is an annular recessed area on the end face of the cylinder block 2 and a positioning structure 32 that is annularly convex relative to the bottom surface of the recessed area. The positioning structure 32 is precisely machined to ensure that its surface is smooth and flawless, so as to reduce friction and improve the sealing performance. The recessed area forms a first sealing section 33 and a second sealing section 34 on both sides of the positioning structure 32 respectively, and the first sealing section 33 and the second sealing section 34 are arranged in a symmetrical structure;

[0039] The outer side wall of the stepped ring 5 is in contact with the inner side of the sealing ring 4, and the inner side wall of the stepped ring 5 is in contact with the piston 1;

[0040] The sealing ring 4 is installed in the sealing groove 3 in an annular shape, and a material with good elasticity and wear resistance is selected. The sealing ring 4 is a U-shaped structure with symmetrical sides, and a reserved groove 42 is provided in the middle. The reserved groove 42 fits with the positioning structure 32 of the sealing groove 3. The outer lips 43 on both sides of the sealing ring 4 are respectively in contact with the first sealing section 33 and the second sealing section 34 to achieve two-way sealing. The inner lip 44 of the sealing ring 4 is in contact with the stepped ring 5;

[0041] When the piston 1 reciprocates in the cylinder block 2, the outer lips 43 on both sides of the sealing ring 4 are respectively in close contact with the first sealing section 33 and the second sealing section 34 to form effective static and dynamic seals. No matter which direction the piston 1 moves, the sealing ring 4 can prevent liquid from leaking from the gap between the cylinder block 2 and the piston 1. The U-shaped structure of the sealing ring 4 and the design of 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 gaps. At the same time, the existence of the stepped ring 5 provides additional supporting force for the sealing ring 4, especially in a high-pressure environment, further improving the sealing performance and always maintaining a good sealing state.

[0042] As a preferred solution, as Figures 2 to 8 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, on the side close to the stepped ring 5, and a cage 6 is provided in each of the inner cavities 45. The cage 6 has rotational elasticity and can push the inner lip 44 to press against the inner side wall of the stepped ring 5 groove. One side of the cage 6 is inclined 61 and the other side is vertical 62 to adapt to different installation and force requirements;

[0043] The cage 6 pushes the inner lip 44 of the sealing ring 4 through its elastic characteristics, so that the inner edge on the inner lip 44 fits tightly with the stepped ring 5 groove. The cage 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.

[0044] 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.

[0045] 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.

[0046] 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;

[0047] 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.

[0048] 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;

[0049] The self-tightening spring 7 provides additional sealing force through its pre-tightening force, making the inner lip 44 of the sealing ring 4 fit more closely against the inner side wall of the stepped ring 5 groove, enhancing the sealing effect, preventing the sealing ring 4 from shifting or deforming under high-pressure environments, and thus ensuring the long-term reliability of the sealing ring 4.

[0050] As a preferred solution, as Figures 2 to 3 shown, the surface of the sealing ring 4 facing the stepped ring 5 is an outwardly convex arc surface 48, which is used to more precisely position the sealing ring 4, for positioning and enhancing the sealing contact area. The radius of curvature of the outwardly convex arc surface 48 should be optimized according to the shape of the stepped ring 5 to ensure a tight fit between the two;

[0051] The outwardly convex arc surface 48 provides a more precise positioning function, enabling the sealing ring 4 to fit more stably against the inner side wall of the stepped ring 5, preventing displacement under high-pressure environments. The outwardly convex arc surface 48 increases the contact area between the sealing ring 4 and the stepped ring 5, thereby enhancing the sealing effect. The design of the outwardly convex arc surface 48 allows the sealing ring 4 to undergo moderate deformation when compressed to better fill possible small gaps.

[0052] As a preferred solution, as Figures 4 to 8 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 provided at the outer lip 43 of the sealing ring 4 corresponding to the inclined groove walls 35. The deformation cavity 49 allows the sealing ring 4 to undergo moderate deformation when compressed to better fill possible small gaps;

[0053] The deformation cavity 49 at the outer lip 43 of the sealing ring 4 allows the sealing ring 4 to undergo moderate deformation when compressed to better fill possible small gaps, thereby enhancing the sealing performance. The combined design of the inclined groove walls 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 high-pressure environments, this design can effectively prevent liquid leakage.

[0054] As a preferred solution, as Figures 2 to 8 shown, the cage 6 has sufficient tensile elasticity, allowing it to undergo a certain degree of deformation during installation and under load, facilitating assembly and maintaining the sealing effect;

[0055] The tensile elasticity design of the cage 6 enables it to undergo moderate deformation during installation, facilitating the accurate embedding of the cage 6 into the inner cavity 45 of the sealing ring 4 and simplifying the assembly process.

[0056] As a preferred solution, as Figures 2 to 8 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;

[0057] The design with a thinner inner lip 44 enables it to undergo moderate deformation when compressed, better filling the possible tiny gaps, thereby enhancing the sealing effect. The design with a thicker outer lip 43 provides a larger contact area and support 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, preventing displacement or deformation in a high-pressure environment.

[0058] As a preferred solution, as Figures 4 to 8 shown, an arc-shaped groove wall 36 is provided at the position corresponding to the wall of the outer lip 43 in the recessed area. The radius of curvature of the arc-shaped groove wall 36 is optimized according to the shape of the outer lip 43 of the sealing ring 4. These arc-shaped groove walls 36 are designed to guide the outer lip 43 of the sealing ring 4, provide a better contact area, provide an additional sealing area, and a convex edge 410 is provided on the outer lip 43 corresponding to the end of the arc-shaped groove wall 36. When the sealing ring 4 is deformed by oil pressure, the outer lip 43 and its convex edge 410 are in close contact with the arc-shaped groove wall 36 to form a seal;

[0059] The convex edge 410 on the outer lip 43 of the sealing ring 4 allows the sealing ring 4 to undergo moderate deformation when compressed to better fill the arc-shaped groove wall 36. At the same time, the design of the arc-shaped groove wall 36 and the convex edge 410 also serves for guiding and buffering, avoiding direct impact on the joint between the sealing ring 4 and the positioning structure 32 to enhance the sealing effect.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended 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 a connection position of two connection structures, the connection structures being a piston (1) and a cylinder body (2), and the two connection structures being 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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