Self-compensating seal for shafts and method of use

Abstract

The application relates to a sealing device for an automatic compensation shaft and a use method thereof, which is located between the automatic compensation shaft and a sealing fitting hole, is used for preventing mutual leakage of flow on both sides of the automatic compensation shaft, has a split type sealing module and a compression overlapping sealing module, and controls oil is introduced into the sealing device through damping holes on the split type sealing module and the compression overlapping sealing module to realize hydraulic oil film supporting and lubricating functions, so that reliable low-friction sealing can be realized in a rotating or reciprocating state; the split type sealing module and the compression overlapping sealing module are modularized, split type installation is adopted, and assembly and disassembly are convenient. Compared with the prior art, the application has the advantages of convenient processing, compact structure, simplicity, easy installation, convenient adjustment, simple maintenance, batch production and the like.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and in particular to a sealing device for an automatic compensation shaft and its method of use. Background Technology

[0002] Conventional shaft seals in the field of fluid control technology can be applied to dynamic and static seals. They are mainly used to prevent internal or external leakage between relatively moving or fixed coupled parts, and to prevent external dust, gas, liquid or other foreign objects from entering between the relatively coupled parts, thereby causing abnormal wear, leakage, pollution and other hidden dangers between the coupled parts and between the coupled parts and the external environment.

[0003] In the field of fluid control, commonly used external seals include O-ring seals, Y-type seals, V-type seals, combination gasket seals, sealing tapes, and dust rings. Coupling seals between parts also include gap seals, line seals, and seals that combine the above sealing forms. Conventional slide valves or cone valves use both external seals and coupling seals between parts.

[0004] External seals are typically annular closed structures to ensure their sealing effect. For an external seal to achieve a reliable seal, it requires a certain amount of pre-compression (or deformation) after assembly. Depending on the different pre-compression requirements for static and dynamic seals, this is usually around 15% to 25% of the effective diameter. For static seals, the final sealing effect also depends on the surface roughness and flatness of the sealing mating surfaces of the parts, the ambient temperature, and the compatibility of the working medium and the sealing material. For dynamic seals, in addition to the above factors, their sealing effect is also affected by the coaxiality, cylindricity, linearity, and wear between the moving parts.

[0005] In reciprocating motion actuators, external seals are often added for ease of installation. The external wear-resistant rings are often made of non-closed cut-out sealing strips, or the seals are first expanded for installation and then shaped after assembly. This can easily cause the assembled seals to twist and deform or become unshapeable, resulting in leaks due to cut edges after assembly.

[0006] For operating conditions with high speed, low frictional resistance, high dynamic response requirements, and high system operating pressure, existing external seals are insufficient to meet the requirements. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects of the prior art by providing an automatic compensation shaft sealing device and its usage method, which has the advantages of convenient processing, compact structure, simplicity, easy installation, convenient adjustment, easy maintenance, and mass production capability.

[0008] The objective of this invention can be achieved through the following technical solutions:

[0009] A sealing device for an automatic compensating shaft is disclosed, wherein the sealing device is located between the automatic compensating shaft and a sealing mating hole, the automatic compensating shaft having an annular mounting groove, and the sealing device is used to prevent fluid leakage between the two sides of the automatic compensating shaft.

[0010] The sealing device is an assembled ring structure, comprising a segmented sealing module and a pressing and overlapping sealing module. The segmented sealing module and the pressing and overlapping sealing module are mutually supported and fixed, and the segmented sealing module and the pressing and overlapping sealing module are arranged sequentially at intervals along the annular mounting groove of the automatic compensation shaft.

[0011] In one embodiment of the present invention, the surface of the segmented sealing module and the pressing overlapping sealing module that connects with the automatic compensation shaft is the bottom surface, and the surface of the segmented sealing module and the pressing overlapping sealing module that connects with the sealing mating hole is the top surface. The bottom surface is a rectangular or annular columnar structure, and the longitudinal depth of the segmented sealing module and the pressing overlapping sealing module is greater than the longitudinal length of the automatic compensation shaft and the sealing mating hole.

[0012] In one embodiment of the present invention, the segmented sealing module includes a segmented sealing module oil mold support groove, a segmented sealing module end overlap groove, a segmented sealing module end overlap block, a segmented sealing module mounting cylindrical base, and a segmented sealing module damping hole.

[0013] The segmented sealing module mounting cylindrical base has a slight concave center and protruding sides, forming a "U"-shaped structure. The concave center of the segmented sealing module mounting cylindrical base connects to the annular mounting groove. A segmented sealing module damping hole is centrally located in the concave center of the segmented sealing module mounting cylindrical base, and the damping hole penetrates through the segmented sealing module mounting cylindrical base. Both protruding sides of the segmented sealing module mounting cylindrical base have segmented sealing module end overlap grooves, and the segmented sealing module end overlap blocks are connected to the protruding sides of the segmented sealing module mounting cylindrical base. The segmented sealing module oil mold support groove is located on the bottom surface of the segmented sealing module mounting cylindrical base, and both ends of the segmented sealing module oil mold support groove are connected to the two segmented sealing module end overlap grooves.

[0014] The recessed part in the middle of the segmented sealing module is connected to the damping hole of the segmented sealing module. By setting a reasonable pilot pressure, the frictional resistance of the shaft hole sealing mating surface is reduced, forming a hydraulic oil film support. The raised edges on both sides of a certain thickness form two sealing ring surfaces to isolate the oil passages on both sides of the sealing strip.

[0015] In one embodiment of the present invention, the segmented sealing module is provided with O-rings at both ends of the recessed part in the middle of the cylindrical base. The O-rings are used to control the leakage of pressure oil through the gap between the mounting bottom surface.

[0016] In one embodiment of the present invention, the pressing and overlapping sealing module includes a pressing and overlapping sealing module mounting cylindrical base, a pressing and overlapping sealing module end overlap groove, a pressing and overlapping sealing module pressing and sealing block, a pressing and overlapping sealing module oil mold support groove, and a pressing and overlapping sealing module damping hole.

[0017] The cylindrical base for mounting the overlapping sealing module has a smooth arc surface in the middle and protruding sides, forming a concave structure. The smooth arc surface in the middle of the cylindrical base connects to the annular mounting groove. A damping hole for the overlapping sealing module is centrally located on the smooth arc surface in the middle of the cylindrical base. The protruding sides of the cylindrical base are provided with end overlap grooves for the overlapping sealing module. The bottom surface of the cylindrical base is connected to the overlapping sealing module pressing block. The damping hole penetrates both the cylindrical base and the overlapping sealing module pressing block. The overlapping sealing module pressing block is connected to the oil mold support groove of the overlapping sealing module.

[0018] In one embodiment of the present invention, the pressing and overlapping sealing module is provided with sealing O-rings at both ends of the smooth arc surface in the middle of the cylindrical base. The sealing O-rings are used to control the leakage of pressure oil through the gap between the mounting bottom surface.

[0019] In one embodiment of the present invention, the end overlapping block of the segmented sealing module is located between the two protruding parts on both sides of the pressing and overlapping sealing module and the two ends of the pressing and overlapping sealing module pressing and sealing block; the end overlapping block of the segmented sealing module is connected to the end overlapping groove of the pressing and overlapping sealing module and the size is adapted to each other; the two ends of the pressing and overlapping sealing module pressing and sealing block are connected to the end overlapping grooves of the two segmented sealing modules and the size is adapted to each other.

[0020] In one embodiment of the present invention, the segmented sealing module oil mold support groove and the pressing overlapping sealing module oil mold support groove are connected.

[0021] In one embodiment of the present invention, the oil mold support groove of the segmented sealing module and the oil mold support groove of the pressing overlapping sealing module are made of copper, carbon steel or graphite. The material is selected according to the working pressure of the system in order to reduce the friction between the segmented sealing module and the pressing overlapping sealing module and the sealing mating hole and form a reliable dynamic seal.

[0022] In one embodiment of the present invention, the number of the segmented sealing module and the pressing overlapping sealing module is greater than or equal to one, depending on the installation size of the automatic compensation shaft and the size of the sealing mating hole, so as to achieve the sealing of the automatic compensation shaft and the sealing mating hole.

[0023] In one embodiment of the present invention, the number of sealing mating holes is greater than or equal to one.

[0024] Furthermore, the present invention also provides a method for using a sealing device for an automatic compensation shaft, the specific steps of which are as follows:

[0025] S1. Design the dimensions of the relevant segmented sealing modules and the pressing overlapping sealing modules. Based on the sealing requirements of the automatic compensation shaft and the sealing mating hole, select the appropriate number of segmented sealing modules and pressing overlapping sealing modules.

[0026] S2. Install the segmented sealing module and the pressing overlapping sealing module in the sealing groove of the automatic compensation shaft. There are no protrusions on the circumference so that the automatic compensation shaft, the segmented sealing module and the pressing overlapping sealing module can be installed into the sealing mating hole.

[0027] S3. Control oil is introduced through the P port on the automatic compensation shaft. The oil is then pushed outward by the damping holes of the corresponding segmented sealing module and the damping holes of the pressing overlapping sealing module. This pushes the mounting cylindrical base of the pressing overlapping sealing module and the mounting cylindrical base of the segmented sealing module outward by a certain distance, so that the sealing device is pushed outward and contacts the inner surface of the sealing mating hole, forming an oil film support and seal. The magnitude of the sealing friction force can be controlled by controlling the pressure at the P port on the automatic compensation shaft.

[0028] In one embodiment of the present invention, if there is an eccentricity between the automatic compensation shaft and the sealing mating hole, the P-port control oil on the automatic compensation shaft can push and adjust the sealing device through the damping hole of the segmented sealing module and the damping hole of the overlapping sealing module, as well as the corresponding segmented sealing module mounting cylindrical base and the overlapping sealing module mounting cylindrical base, to ensure reliable contact between the automatic compensation shaft and the sealing mating hole and form an effective seal.

[0029] The principle of this invention is as follows:

[0030] This invention relates to a sealing device for an automatically compensating shaft, comprising: a segmented sealing module and a pressing and overlapping sealing module; control oil is introduced into the sealing device through throttling orifices on the segmented sealing module and the pressing and overlapping sealing module to achieve hydraulic oil film support and lubrication functions, so as to achieve reliable low-friction sealing under rotation; by adjusting the pressure of the control oil, the mating clearance between the sealing device and the assembly hole can be controlled to reduce leakage and heat generation between the sealing mating surfaces; the segmented sealing module and the pressing and overlapping sealing module can be selected to use copper, carbon steel or graphite as the contact surface sealing material with the stator according to the system working pressure, so as to reduce the friction between the sealing mating surfaces and form a reliable dynamic seal; the segmented sealing module and the pressing and overlapping sealing module adopt a modular design, segmented installation, and convenient installation and disassembly. It has the advantages of convenient processing, compact structure, simplicity, easy installation, convenient adjustment, simple maintenance, and mass production capability.

[0031] The segmented sealing module has a slightly concave center and convex sides, forming a "U"-shaped structure. The concave center communicates with the damping hole on its mounting base to reduce frictional resistance at the shaft-hole sealing mating surface, creating a hydraulic oil film support. The two convex edges of a certain thickness form two sealing rings to isolate the oil passages on both sides of the sealing strip. The mounting base of the segmented sealing module is a rectangular (or annular) columnar structure, with an installation depth much greater than the length required for compensation to achieve a seal (the sum of the radial clearance of the shaft-hole mating and the pre-installation radial retraction length). The two ends of the segmented sealing module have sealing strips with a deeper concave center and convex sides, allowing them to overlap and be compressed with the concave portion of the pressing and overlapping sealing module.

[0032] The compression overlapping sealing module can be divided into two parts: The first is the overlapping sealing section, which has a smooth, rounded center and raised sides, forming a concave structure. Both ends of the overlapping sealing section are deeply recessed in the middle, with raised sides forming a concave structure. The concave part supports the segmented sealing block's sealing strip, and the height of the raised sides matches the height of the overlapping sealing block's sealing strip. The width of the concave part matches the external dimensions of the segmented sealing block's sealing strip. The second part is the compression sealing section, which has a slightly recessed center and raised sides forming a concave structure. Its length in conjunction with the segmented sealing module is greater than the length of the segmented sealing block and the overlapping sealing section. Its width matches the recessed part in the middle of the segmented sealing module, and its height after installation matches the raised sides of both the overlapping sealing section and the segmented sealing strip. The compression sealing section and the overlapping sealing section are installed using embedded rivets or screws to avoid affecting the sealing fit between the mating surfaces.

[0033] The segmented sealing module and the compression overlapping sealing module increase the support strength and sealing effect through multiple overlaps in the overlapping part.

[0034] The device employs a segmented sealing mechanism with two structures. Depending on the hole-shaft fit dimensions, the quantity of each structure can be designed and selected to meet the sealing requirements of different hole-shaft fit sizes. It can satisfy both high-speed rotating hole-shaft sealing and axial reciprocating motion sealing requirements. This is particularly useful in structures where the installation or removal of the seal requires passing through a large number of machined holes, and where there is a slightly large clearance or eccentricity in the hole-shaft fit. (This structure completely avoids the drawbacks of conventional rubber elastic seals, such as being cut off when passing through the internal holes, rubber elastic seals losing elasticity after expansion and becoming difficult to install, and eccentricity in the hole-shaft fit causing poor sealing.)

[0035] Compared with the prior art, the advantages of the present invention are as follows:

[0036] 1. This invention designs a novel split-type sealing device with two modular structures to achieve hole-shaft mating sealing. The split-type sealing module and the pressing overlapping sealing module increase the support strength and sealing effect through multiple overlaps in the overlapping part. It has the advantages of convenient processing, compact and simple structure, easy installation, convenient adjustment, simple maintenance, and mass production.

[0037] 2. Through modular design, the present invention can design and select the quantity of each structure according to different hole and shaft fit dimensions, so as to meet the sealing requirements of hole and shaft fit of different sizes. It can meet both the sealing requirements of rotating hole and shaft and the sealing requirements of axial reciprocating motion.

[0038] 3. This invention adjusts and controls the sealing pressure and measures the corresponding leakage to set requirements for low friction and low leakage for different hole-shaft fits;

[0039] 4. The present invention has an automatic compensation sealing function, which realizes the automatic compensation sealing function when the relevant hole-shaft mating clearance increases or when there is an eccentricity in the hole-shaft mating.

[0040] 5. The automatic compensation sealing function of this invention is also reflected in ensuring reliable sealing when the moving bearing is subjected to radial force.

[0041] 6. The present invention adopts an internal split shaft installation, which avoids potential hazards such as cut edges and deformation of the sealing structure that are difficult to recover when installing or disassembling the seal, which requires passing through a large number of machining holes. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of an automatic compensation shaft installation seal according to the present invention;

[0043] Figure 2 This is a schematic diagram of a segmented sealing module;

[0044] Figure 3 Schematic diagram of the overlapping sealing module for compression;

[0045] Figure 4 This is an exploded view of an automatic compensation shaft installation seal according to the present invention.

[0046] Explanation of reference numerals in the attached drawings: 1. Sealing device; 2. Segmented sealing module; 21. O-ring of segmented sealing module; 22. Oil mold support groove of segmented sealing module; 23. End overlap groove of segmented sealing module; 24. End overlap block of segmented sealing module; 25. Mounting cylindrical base of segmented sealing module; 26. Damping hole of segmented sealing module; 3. Pressing overlapping sealing module; 31. O-ring of pressing overlapping sealing module; 32. Mounting cylindrical base of pressing overlapping sealing module; 33. End overlap groove of pressing overlapping sealing module; 34. Pressing sealing block of pressing overlapping sealing module; 35. Oil mold support groove of pressing overlapping sealing module; 36. Damping hole of pressing overlapping sealing module; 4. Sealing mating hole; 5. Automatic compensation shaft; P. Oil supply channel; T. Oil return channel; AA. Sectional view of segmented sealing module; BB. Sectional view of pressing overlapping sealing module. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0048] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] A sealing device 1 for an automatic compensating shaft is disclosed, wherein the sealing device 1 is located between the automatic compensating shaft 5 and a sealing mating hole 4, the automatic compensating shaft 5 is provided with an annular mounting groove, and the sealing device 1 is used to prevent fluid leakage between the two sides of the automatic compensating shaft 5.

[0051] The sealing device 1 is an assembled ring structure. The sealing device 1 includes a segmented sealing module 2 and a pressing and overlapping sealing module 3. The segmented sealing module 2 and the pressing and overlapping sealing module 3 are mutually supported and fixed. The segmented sealing module 2 and the pressing and overlapping sealing module 3 are arranged sequentially at intervals along the annular mounting groove of the automatic compensation shaft 5.

[0052] In one embodiment of the present invention, the surface where the segmented sealing module 2 and the pressing overlapping sealing module 3 are in contact with the automatic compensation shaft 5 is the bottom surface, and the surface where the segmented sealing module 2 and the pressing overlapping sealing module 3 are in contact with the sealing mating hole 4 is the top surface. The bottom surface is a rectangular or annular columnar structure, and the longitudinal depth of the segmented sealing module 2 and the pressing overlapping sealing module 3 is greater than the longitudinal length of the automatic compensation shaft 5 and the sealing mating hole 4.

[0053] In one embodiment of the present invention, the segmented sealing module 2 includes a segmented sealing module oil mold support groove 22, a segmented sealing module end overlap groove 23, a segmented sealing module end overlap block 24, a segmented sealing module mounting cylindrical base 25, and a segmented sealing module damping hole 26.

[0054] The segmented sealing module mounting cylindrical base 25 has a slight indentation in the middle and protrusions on both sides, forming a "concave" structure. The indentation in the middle of the segmented sealing module mounting cylindrical base 25 connects to the annular mounting groove. A segmented sealing module damping hole 26 is provided in the center of the indentation in the middle of the segmented sealing module mounting cylindrical base 25. The segmented sealing module damping hole 26 penetrates through the segmented sealing module mounting cylindrical base 25. The protrusions on both sides of the segmented sealing module mounting cylindrical base 25 are provided with segmented sealing module end overlap grooves 23. The segmented sealing module end overlap blocks 24 are connected to the protrusions on both sides of the segmented sealing module mounting cylindrical base 25. The segmented sealing module oil mold support groove 22 is provided on the bottom surface of the segmented sealing module mounting cylindrical base 25. The two ends of the segmented sealing module oil mold support groove 22 are connected to the two segmented sealing module end overlap grooves 23.

[0055] The recessed part in the middle of the segmented sealing module 2 is connected to the damping hole 26 of the segmented sealing module. By setting a reasonable pilot pressure, the frictional resistance of the shaft hole sealing mating surface is reduced, forming a hydraulic oil film support. The raised edges on both sides of a certain thickness form two sealing ring surfaces to isolate the oil passages on both sides of the sealing strip.

[0056] In one embodiment of the present invention, the segmented sealing module mounting cylindrical base 25 is provided with segmented sealing module sealing O-rings 21 at both ends of the middle recess, and the segmented sealing module sealing O-rings 21 are used to control the leakage of pressure oil through the gap of the mounting bottom surface.

[0057] In one embodiment of the present invention, the pressing and overlapping sealing module 3 includes a pressing and overlapping sealing module mounting cylindrical base 32, a pressing and overlapping sealing module end overlap groove 33, a pressing and overlapping sealing module pressing and sealing block 34, a pressing and overlapping sealing module oil mold support groove 35, and a pressing and overlapping sealing module damping hole 36.

[0058] The cylindrical base 32 for mounting the overlapping sealing module has a smooth arc surface in the middle and protruding sides, forming a concave structure. The smooth arc surface in the middle of the cylindrical base 32 connects to the annular mounting groove. A damping hole 36 for the overlapping sealing module is centrally located on the smooth arc surface in the middle of the cylindrical base 32. The protruding sides of the cylindrical base 32 are provided with end overlap grooves 33 for the overlapping sealing module. The bottom surface of the cylindrical base 32 is connected to the overlapping sealing module pressing and sealing block 34. The damping hole 36 penetrates the cylindrical base 32 and the overlapping sealing module pressing and sealing block 34. The overlapping sealing module pressing and sealing block 34 is connected to the oil mold support groove 35 of the overlapping sealing module.

[0059] In one embodiment of the present invention, both ends of the smooth arc surface in the middle of the cylindrical base 32 for mounting the compression overlapping sealing module are provided with O-rings 31 for the compression overlapping sealing module. The O-rings 31 for the compression overlapping sealing module are used to control the leakage of pressure oil through the gap between the mounting bottom surface.

[0060] In one embodiment of the present invention, the segmented sealing module end overlap block 24 is located between the two protruding parts on both sides of the pressing and overlapping sealing module 3 and the two ends of the pressing and overlapping sealing module pressing and sealing block 34; the segmented sealing module end overlap block 24 is connected to the pressing and overlapping sealing module end overlap groove 33 and the size is adapted to each other; the two ends of the pressing and overlapping sealing module pressing and sealing block 34 are connected to the two segmented sealing module end overlap grooves 23 and the size is adapted to each other.

[0061] In one embodiment of the present invention, the segmented sealing module oil mold support groove 22 and the pressing overlapping sealing module oil mold support groove 35 are connected.

[0062] In one embodiment of the present invention, the oil mold support groove 22 of the segmented sealing module and the oil mold support groove 35 of the pressing and overlapping sealing module are made of copper, carbon steel or graphite. The material is selected according to the working pressure of the system so as to reduce the friction between the segmented sealing module 2 and the pressing and overlapping sealing module 3 and the sealing mating hole 4 and form a reliable dynamic seal.

[0063] In one embodiment of the present invention, the number of the segmented sealing module 2 and the pressing overlapping sealing module 3 is greater than or equal to one, depending on the installation size of the automatic compensation shaft 5 and the size of the sealing mating hole 4, so as to achieve the sealing of the automatic compensation shaft 5 and the sealing mating hole 4.

[0064] In one embodiment of the present invention, the number of sealing mating holes 4 is greater than or equal to one.

[0065] Furthermore, the present invention also provides a method for using a sealing device for an automatic compensation shaft, the specific steps of which are as follows:

[0066] S1. Design the dimensions of the relevant segmented sealing module 2 and the pressing overlapping sealing module 3. Based on the sealing requirements of the automatic compensation shaft 5 and the sealing mating hole 4, select the appropriate number of segmented sealing modules 2 and pressing overlapping sealing modules 3.

[0067] S2. Install the segmented sealing module 2 and the pressing overlapping sealing module 3 in the sealing groove of the automatic compensation shaft 5. There are no protrusions on the circumference so that the automatic compensation shaft 5, the segmented sealing module 2 and the pressing overlapping sealing module 3 can be installed into the sealing mating hole 4.

[0068] S3. Control oil is introduced through port P on the automatic compensation shaft 5. The oil is then introduced through the damping holes 26 and 36 of the corresponding segmented sealing module and the damping holes 36 of the overlapping sealing module. This pushes the cylindrical base 32 of the overlapping sealing module and the cylindrical base 25 of the segmented sealing module to extend outward by a certain distance, so that the sealing device 1 is pushed outward and contacts the inner surface of the sealing mating hole 4, forming an oil film support and seal. The magnitude of the sealing friction can be controlled by controlling the pressure at port P on the automatic compensation shaft 5.

[0069] In one embodiment of the present invention, if there is an eccentricity between the automatic compensation shaft 5 and the sealing mating hole 4, the P-port control oil on the automatic compensation shaft 5 can push and adjust the sealing device 1 through the damping hole 26 of the segmented sealing module, the damping hole 36 of the pressing overlapping sealing module, the corresponding segmented sealing module mounting cylindrical base 25, and the pressing overlapping sealing module mounting cylindrical base 32, to ensure reliable contact between the automatic compensation shaft 5 and the sealing mating hole 4 and form an effective seal.

[0070] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0071] Example

[0072] like Figures 1 to 4 As shown, this embodiment provides a sealing device for an automatic compensation shaft. The sealing device 1 is located between the automatic compensation shaft 5 and the sealing mating hole 4. The automatic compensation shaft 5 is provided with an annular mounting groove. The sealing device 1 is used to prevent fluid leakage between the two sides of the automatic compensation shaft 5.

[0073] The sealing device 1 is an assembled ring structure, comprising: a segmented sealing module 2 and a pressing and overlapping sealing module 3; here, an embodiment using two of each type of sealing module is adopted, such as... Figure 4 The illustration is shown.

[0074] In this embodiment, the automatic compensation sealing device 1 is installed on the automatic compensation sealing shaft 5 to form a sealing mating surface with the corresponding sealing mating hole 4, preventing fluid leakage between the two sides of the sealing device. The control oil P enters the segmented sealing module 2 through the damping hole 26 of the segmented sealing module on the automatic compensation shaft 5, and enters the pressing overlapping sealing module 3 through the damping hole 36 of the pressing overlapping sealing module. In motion, a hydraulic oil film support is formed between the sealing device 1 and the sealing mating hole 4, which also serves as a lubricant, so as to achieve reliable low-friction sealing in rotation or reciprocating motion. By adjusting the pressure of the control oil P on the automatic compensation shaft 5, the mating clearance between the sealing device 1 and the sealing mating hole 4 can be controlled, thereby controlling the friction of the sealing mating surface, reducing leakage, and reducing heat generation between the sealing mating surfaces. The segmented sealing module 2 and the pressing overlapping sealing module 3 can be made of copper, carbon steel, or graphite as the contact surface sealing material with the stator, depending on the system working pressure, in order to reduce the friction with the stator and form a reliable dynamic seal.

[0075] like Figure 2 As shown, the segmented sealing module 2 includes a segmented sealing module O-ring 21, a segmented sealing module oil mold support groove 22, a segmented sealing module end overlap groove 23, a segmented sealing module end overlap block 24, a segmented sealing module mounting cylindrical base 25, and a segmented sealing module damping hole 26. The segmented sealing module O-ring 21 is mainly used to prevent the control oil introduced from the P port on the automatic compensation shaft 5 through the segmented sealing module damping hole 26 from leaking to the working oil ports on both sides of the sealing device. The control oil enters the area between the segmented sealing module oil mold support groove 22 and the sealing mating hole 4 through the segmented sealing module damping hole 26, forming a certain hydraulic support. The pressure of the control cavity of the segmented sealing module mounting cylindrical base 25 works together to form a sealing clamping force between the segmented sealing module 2 and the sealing mating hole 4.

[0076] like Figure 3As shown, the pressing and overlapping sealing module 3 includes a pressing and overlapping sealing module sealing O-ring 31, a pressing and overlapping sealing module mounting cylindrical base 32, a pressing and overlapping sealing module end overlap groove 33, a pressing and overlapping sealing module pressing and sealing block 34, a pressing and overlapping sealing module oil mold support groove 35, and a pressing and overlapping sealing module damping hole 36. The pressing and overlapping sealing module sealing O-ring 31 is mainly used to prevent the control oil introduced from the P port on the automatic compensation shaft 5 through the pressing and overlapping sealing module damping hole 36 from leaking to the working oil ports on both sides of the sealing device. The control oil enters the area between the pressing and overlapping sealing module oil mold support groove 35 and the sealing mating hole 4 through the pressing and overlapping sealing module damping hole 36, forming a certain hydraulic support. The pressure of the pressing and overlapping sealing module mounting cylindrical base 32 control cavity works together to form a sealing and pressing force between the segmented sealing module 3 and the sealing mating hole 4.

[0077] like Figure 1 As shown, the segmented sealing module end overlap block 24 on the segmented sealing module 2 and the pressing overlap sealing module end overlap groove 33 on the pressing overlap sealing module 3, as well as the segmented sealing module end overlap groove 23 on the segmented sealing module 2 and the pressing overlap sealing module pressing sealing block 34 on the pressing overlap sealing module 3, are finally assembled and fixed together to form an integral seal.

[0078] It adopts a modular design, with segmented installation, making installation and disassembly convenient. It has the advantages of easy processing, compact structure, simplicity, easy installation, convenient adjustment, easy maintenance, and remanufacturing and calibration.

[0079] Furthermore, the present invention also provides a method for using a sealing device for an automatic compensation shaft, the specific steps of which are as follows:

[0080] S1. In the initial state, design the dimensions of the relevant segmented sealing module 2 and the pressing overlapping sealing module 3. According to the sealing requirements of the automatic compensation shaft 5 and the sealing mating hole 4, select the appropriate number of segmented sealing modules 2 and pressing overlapping sealing modules 3.

[0081] S2. In the assembled state, install the segmented sealing module 2 and the pressing overlapping sealing module 3 in the sealing groove of the automatic compensation shaft 5, with no protrusions on the circumference, so that the automatic compensation shaft 5, the segmented sealing module 2 and the pressing overlapping sealing module 3 can be installed into the sealing mating hole 4.

[0082] S3. In the working state, control oil is introduced through the P port on the automatic compensation shaft 5. The oil is then introduced through the damping holes 26 and 36 of the corresponding segmented sealing module and the damping holes 36 of the pressing overlapping sealing module, respectively. This pushes the pressing overlapping sealing module mounting cylindrical base 32 and the segmented sealing module mounting cylindrical base 25 outward by a certain distance, so that the sealing device 1 is pushed outward and contacts the inner surface of the sealing mating hole 4, forming an oil film support and seal. The magnitude of the sealing friction force can be controlled by controlling the pressure at the P port on the automatic compensation shaft 5.

[0083] In this embodiment, if there is an eccentricity between the automatic compensation shaft 5 and the sealing mating hole 4, the P-port control oil on the automatic compensation shaft 5 can push and adjust the sealing device 1 through the damping hole 26 of the segmented sealing module, the damping hole 36 of the pressing overlapping sealing module, the corresponding segmented sealing module mounting cylindrical base 25, and the pressing overlapping sealing module mounting cylindrical base 32, to ensure reliable contact between the automatic compensation shaft 5 and the sealing mating hole 4 and form an effective seal.

[0084] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A sealing device for an automatic compensating shaft, the sealing device (1) being located between the automatic compensating shaft (5) and a sealing mating hole (4), wherein the automatic compensating shaft (5) is provided with an annular mounting groove, characterized in that, The sealing device (1) is used to prevent fluid leakage between the two sides of the automatic compensation shaft (5). The sealing device (1) is an assembled ring structure. The sealing device (1) includes a segmented sealing module (2) and a pressing and overlapping sealing module (3). The segmented sealing module (2) and the pressing and overlapping sealing module (3) support and fix each other. The segmented sealing module (2) and the pressing and overlapping sealing module (3) are arranged sequentially at intervals along the annular mounting groove of the automatic compensation shaft (5). The segmented sealing module (2) includes a segmented sealing module oil mold support groove (22), a segmented sealing module end overlap groove (23), a segmented sealing module end overlap block (24), a segmented sealing module mounting cylindrical base (25), and a segmented sealing module damping hole (26). The segmented sealing module mounting cylindrical base (25) has a slight indentation in the middle and protrusions on both sides, forming a concave structure. The concave part in the middle of the bottom surface of the segmented sealing module mounting cylindrical base (25) connects with the annular mounting groove. A segmented sealing module damping hole (26) is provided in the center of the concave part of the segmented sealing module mounting cylindrical base (25). The segmented sealing module damping hole (26) penetrates the segmented sealing module mounting cylindrical base (25). The protrusions on both sides of the segmented sealing module mounting cylindrical base (25) Each is provided with a segmented sealing module end overlap groove (23). The segmented sealing module end overlap block (24) is connected to the two protruding parts on both sides of the segmented sealing module mounting cylindrical base (25). The segmented sealing module oil mold support groove (22) is provided on the bottom surface of the segmented sealing module mounting cylindrical base (25). The two ends of the segmented sealing module oil mold support groove (22) are connected to the two segmented sealing module end overlap grooves (23). The middle recessed part of the segmented sealing module (2) is connected to the segmented sealing module damping hole (26). The pressing and overlapping sealing module (3) includes a pressing and overlapping sealing module mounting cylindrical base (32), a pressing and overlapping sealing module end overlap groove (33), a pressing and overlapping sealing module pressing and sealing block (34), a pressing and overlapping sealing module oil mold support groove (35), and a pressing and overlapping sealing module damping hole (36). The cylindrical base (32) for mounting the overlapping sealing module has a smooth arc surface in the middle and protrusions on both sides, forming a concave structure. The smooth arc surface in the middle of the cylindrical base (32) is connected to the annular mounting groove. A damping hole (36) for the overlapping sealing module is provided in the center of the smooth arc surface in the middle of the cylindrical base (32). The protrusions on both sides of the cylindrical base (32) are provided with end overlap grooves (33) for the overlapping sealing module. The bottom surface of the cylindrical base (32) is connected to the overlapping sealing module pressing block (34). The damping hole (36) for the overlapping sealing module penetrates the cylindrical base (32) and the overlapping sealing module pressing block (34). The overlapping sealing module pressing block (34) is connected to the oil mold support groove (35) for the overlapping sealing module.

2. The sealing device for an automatic compensating shaft according to claim 1, characterized in that, The surface of the segmented sealing module (2) and the pressing overlapping sealing module (3) that connects with the automatic compensation shaft (5) is the bottom surface. The surface of the segmented sealing module (2) and the pressing overlapping sealing module (3) that connects with the sealing mating hole (4) is the top surface. The segmented sealing module (2) and the pressing overlapping sealing module (3) are columnar structures with rectangular or annular bottom surfaces. The longitudinal depth of the segmented sealing module (2) and the pressing overlapping sealing module (3) is greater than the longitudinal length of the automatic compensation shaft (5) and the sealing mating hole (4).

3. The sealing device for an automatic compensation shaft according to claim 1, characterized in that, The segmented sealing module mounting cylindrical base (25) has two ends of the middle recessed part, and the segmented sealing module sealing O-ring (21) is used to control the leakage of pressure oil through the gap of the mounting bottom surface. The cylindrical base (32) of the pressing and overlapping sealing module is provided with O-rings (31) at both ends of the smooth arc surface in the middle. The O-rings (31) are used to control the leakage of pressure oil through the gap of the mounting bottom surface.

4. A sealing device for an automatic compensating shaft according to claim 1, characterized in that, The segmented sealing module end overlap block (24) is located between the two protruding parts on both sides of the pressing and overlapping sealing module (3) and the two ends of the pressing and overlapping sealing module pressing and sealing block (34); the segmented sealing module end overlap block (24) is connected to the pressing and overlapping sealing module end overlap groove (33) and the size is compatible; the two ends of the pressing and overlapping sealing module pressing and sealing block (34) are connected to the two segmented sealing module end overlap grooves (23) and the size is compatible.

5. A sealing device for an automatically compensating shaft according to claim 1, characterized in that, The segmented sealing module oil mold support groove (22) and the pressing overlapping sealing module oil mold support groove (35) are connected.

6. A sealing device for an automatically compensating shaft according to claim 1, characterized in that, The segmented sealing module oil mold support groove (22) and the pressing overlapping sealing module oil mold support groove (35) are made of copper, carbon steel or graphite.

7. A sealing device for an automatically compensating shaft according to claim 1, characterized in that, The number of the segmented sealing module (2) and the pressing overlapping sealing module (3) is greater than or equal to one, and is used to achieve the sealing of the automatic compensation shaft (5) and the sealing mating hole (4); The number of sealing mating holes (4) is greater than or equal to one.

8. A method of using a sealing device for an automatically compensating shaft according to any one of claims 1-7, characterized in that, The specific steps are as follows: S1. Design the dimensions of the relevant segmented sealing module (2) and the pressing overlapping sealing module (3). According to the sealing requirements of the automatic compensation shaft (5) and the sealing mating hole (4), select the appropriate number of segmented sealing modules (2) and pressing overlapping sealing modules (3). S2. Install the segmented sealing module (2) and the pressing overlapping sealing module (3) in the sealing groove of the automatic compensation shaft (5), with no protrusions on the circumference, so that the automatic compensation shaft (5), the segmented sealing module (2) and the pressing overlapping sealing module (3) can be installed into the sealing mating hole (4); S3. Control oil is introduced through the P port on the automatic compensation shaft (5). Through the damping hole (26) of the corresponding segmented sealing module and the damping hole (36) of the pressing overlapping sealing module, the pressing overlapping sealing module mounting cylindrical base (32) and the segmented sealing module mounting cylindrical base (25) are pushed outward by a certain distance, so that the sealing device (1) is pushed outward to contact the inner surface of the sealing mating hole (4) to form an oil film support and seal. The magnitude of the sealing friction force can be achieved by controlling the pressure of the P port on the automatic compensation shaft (5).

9. The method of using the sealing device for an automatic compensating shaft according to claim 8, characterized in that, If there is an eccentricity between the automatic compensation shaft (5) and the sealing mating hole (4), the P-port control oil on the automatic compensation shaft (5) can push and adjust the sealing device (1) through the damping hole (26) of the segmented sealing module and the damping hole (36) of the pressing overlapping sealing module, as well as the corresponding segmented sealing module mounting cylindrical base (25) and the pressing overlapping sealing module mounting cylindrical base (32), to ensure that the automatic compensation shaft (5) and the sealing mating hole (4) are in reliable contact and form an effective seal.

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