Sealing isolation device with dielectric discontinuity

Abstract

This invention provides a sealing and isolation device with media difference, comprising a sealing sleeve, a plunger, a clamping copper ring, a sealing ring, and a rubber sealing sleeve. The interior of the first end of the first sealing sleeve is connected to the first end of the rubber sealing sleeve via the clamping copper ring. The second end of the rubber sealing sleeve is connected to the bottom surface of the interior of the plunger and the second sealing sleeve. The exterior of the second end of the first sealing sleeve is connected to the side wall of the interior of the second sealing sleeve. The exterior of the second sealing sleeve is connected to the interior of the third sealing sleeve. The rubber sealing sleeve and the upper pressure plate form a first volumetric cavity. The boss connecting side of the first sealing sleeve, the end face of the second sealing sleeve, and the interior of the third sealing sleeve form a second volumetric cavity. The end face of the first sealing sleeve, the exterior of the plunger, and the bottom surface of the interior of the second sealing sleeve form a third volumetric cavity. This invention employs a three-layer sealing sleeve system, utilizing the volume change generated by the relative movement between the sealing sleeves to achieve thin-film lubrication of the relatively contacting parts, thereby improving sealing performance.

Description

Technical Field

[0001] This invention relates to the field of fluid transmission sealing technology, and in particular to a sealing and isolation device with media differences. Background Technology

[0002] Fluid transmission plays a crucial role in the development of related fields, especially in aerospace, robotics, and engineering machinery. However, with changes in the working environment and usage requirements of transmission machinery, media have shifted from hydraulic oil to water, seawater, blood, and others. Since the relative motion between machines relies on the lubrication of hydraulic oil, sealing and isolation devices become essential. Existing sealing and isolation devices improve the structure by increasing the number of seals to enhance the reliability of dynamic seals, but this results in low sealing efficiency, especially in high-pressure, high-flow environments, leading to low sealing reliability and short seal life.

[0003] This invention addresses the aforementioned problems by proposing a sealing and isolation device with media-differentiation capabilities. Utilizing the elastic deformation of the rubber isolation sleeve, it transforms the dynamic seal in reciprocating motion into a static seal. Simultaneously, through structural design, it provides ample lubrication to the surfaces of components experiencing relative movement within the sealing device, allowing any potentially leaking lubricating fluid to flow back into the pump body. Specifically, this device is suitable for high-pressure, high-flow-rate applications, and for applications involving hydrostatic support friction pairs. The overall device is easy to install, highly reliable, and has a long service life. It is suitable for both high-pressure and low-pressure applications and has significant application prospects in marine engineering equipment, coal mining equipment, and medical engineering equipment. Summary of the Invention

[0004] To address the problems of existing technologies, this invention provides a sealing and isolation device with media difference. By employing a sealing method in which a first sealing sleeve, a third sealing sleeve, and a second sealing sleeve cooperate, a first volumetric cavity is formed by the interior of the rubber sealing sleeve and the fluid passage hole in the middle of the upper pressure plate. A second volumetric cavity is formed by the boss connecting side of the first sealing sleeve, the end face of the second sealing sleeve, and the interior of the third sealing sleeve. A third volumetric cavity is formed by the end face of the first sealing sleeve, the exterior of the plunger, and the bottom surface of the interior of the second sealing sleeve. The volume change generated by the relative movement between the sealing sleeves achieves thin-film lubrication of the relatively contacting parts, improving sealing performance and extending the service life of the seals. Simultaneously, a flow channel is provided within the volumetric cavity generated between the sealing sleeves to achieve unloading and recovery of the second fluid.

[0005] This invention provides a sealing and isolation device with media difference, comprising a first sealing sleeve, a third sealing sleeve, a second sealing sleeve, a plunger, a clamping copper ring, a lower pressure plate, a first sealing ring, a third sealing ring, a second sealing ring, an upper pressure plate, and a rubber sealing sleeve. The first mounting end of the upper pressure plate is connected to the first mounting end of the lower pressure plate. The annular groove of the upper pressure plate is connected to the outside of the first end of the first sealing sleeve. The inside of the first end of the first sealing sleeve is connected to the first end of the rubber sealing sleeve via the clamping copper ring. The second end of the rubber sealing sleeve is connected to the first mounting end of the plunger. The second mounting end of the plunger is connected to the bottom surface of the inside of the second sealing sleeve. The outer sidewall of the rubber sealing sleeve and the outer sidewall of the plunger are respectively located inside the second end of the first sealing sleeve. The outside of the second end of the first sealing sleeve is connected to the inner sidewall of the second sealing sleeve. The outside of the second sealing sleeve is connected to the inside of the third sealing sleeve. The outside of the third sealing sleeve is connected to the inside of the lower pressure plate. The boss end of the first sealing sleeve is connected to the boss end of the third sealing sleeve. The first sealing sleeve has a first sealing groove along the circumferential direction at the boss of the first sealing sleeve, and a first liquid guiding hole at the position where it connects with the boss of the third sealing sleeve. The first liquid guiding holes are evenly distributed along the circumferential direction of the first sealing sleeve, and the opening position of the first liquid guiding hole is parallel to the axis of the first sealing sleeve. The third sealing sleeve has a second sealing groove along the circumferential direction at the boss of the third sealing sleeve, and a second liquid guiding hole and a liquid groove are respectively provided at the position opposite to the boss of the first sealing sleeve. The second liquid guiding holes are evenly distributed along the circumferential direction of the third sealing sleeve, and the opening position of the second liquid guiding hole is perpendicular to the axis of the third sealing sleeve. A first through hole is provided in the middle of the bottom surface of the second sealing sleeve, and a first bolt hole and a third liquid guiding hole are respectively provided along the circumferential direction of the bottom surface of the second sealing sleeve. The interior of the rubber sealing sleeve and the liquid passage hole in the middle of the upper pressure plate form a first volume chamber. The first volume chamber is a liquid volume chamber with damping holes. The boss connecting side of the first sealing sleeve, the end face of the second sealing sleeve and the interior of the third sealing sleeve form a second volume chamber. The end face of the first sealing sleeve, the exterior of the plunger and the bottom surface of the interior of the second sealing sleeve form a third volume chamber.

[0006] Preferably, the upper pressure plate has a liquid passage hole in the middle, and an annular groove at one end of the liquid passage hole. The upper pressure plate has a second countersunk hole and a third through hole evenly arranged in the circumferential direction, and the axes of the second countersunk hole and the third through hole are on the same straight line.

[0007] Preferably, the first mounting end of the lower pressure plate connected to the upper pressure plate is provided with a third sealing groove, the middle part of the first mounting end of the lower pressure plate is a conical groove, the connecting side of the conical groove is a plum blossom hole, and the middle part of the second mounting end of the lower pressure plate is a circular through hole.

[0008] Preferably, the plunger has a second bolt hole in the middle and a third bolt hole is evenly provided in the circumferential direction of the plunger.

[0009] Preferably, the second sealing ring is located in the third sealing groove of the lower pressure plate, and the first sealing ring and the third sealing ring are located in the second sealing groove of the third sealing sleeve and the first sealing groove of the first sealing sleeve, respectively.

[0010] Preferably, in the second sealing sleeve, the distance between the third liquid guide hole and the first through hole along the radial direction of the second sealing sleeve is greater than the distance between the first bolt hole and the first through hole.

[0011] Preferably, the axes of the first sealing sleeve, the third sealing sleeve, the second sealing sleeve, the plunger, the compression copper ring, the lower pressure plate, the first sealing ring, the third sealing ring, the second sealing ring, the upper pressure plate, and the rubber sealing sleeve are on the same straight line.

[0012] Preferably, it also includes a second sealing sleeve for hydrostatic support, a plunger for hydrostatic support, and a spring, the spring being located inside the rubber sealing sleeve.

[0013] Preferably, the second sealing sleeve for hydrostatic support has a second through hole in the middle, and the second sealing sleeve for hydrostatic support has a second groove uniformly provided in the circumferential direction.

[0014] Preferably, the plunger for hydrostatic support and the second sealing sleeve for hydrostatic support are provided with a first groove uniformly in the circumferential direction on the connection side, the plunger for hydrostatic support and the second sealing sleeve for hydrostatic support are provided with a first countersunk hole in the middle of the connection side, and the plunger for hydrostatic support is provided with a liquid passage hole on the side wall.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This invention transforms the reciprocating dynamic seal into a static seal by distributing the first and third sealing rings along the axial direction of the plunger and placing them inside the first sealing groove of the first sealing sleeve and the third sealing groove of the third sealing sleeve, respectively, and by placing the second sealing ring inside the third sealing groove of the lower pressure plate. This static seal replaces the dynamic seal, improving the reliability of the seal and avoiding problems such as large wear, short lifespan, and large leakage caused by the viscoelasticity of the rubber in the dynamic seal. It has the advantages of simple structure and good isolation effect.

[0017] 2. The present invention adopts a sealing method with three layers of sealing sleeves working together. The volume change generated by the relative movement between the sealing sleeves realizes thin film lubrication of the relatively contact parts, which greatly improves the sealing performance and extends the service life of the seal.

[0018] 3. This invention employs a sealing method with three layers of sealing sleeves working together. A flow channel is set in the volume cavity created between the sealing sleeves, which can realize unloading and recovery of the second fluid. It can achieve highly reliable multi-media isolation, making it suitable for use as a biomimetic organ for biological applications. It is applicable to the field of multi-media hydraulic pumps such as seawater pumps, blood pumps, and heart pumps.

[0019] 4. The sealing and transmission device for different fluid media proposed in this invention has excellent multi-media isolation effect, and the sealing method of three-layer sealing sleeves working together greatly improves the service life of the seal. Attached Figure Description

[0020] Figure 1 This is an overall cross-sectional view of the sealing and isolation device with media differences according to the present invention;

[0021] Figure 2 This is a structural diagram of the first sealing sleeve in the sealing and isolation device with media difference of the present invention;

[0022] Figure 3 This is a structural diagram of the third sealing sleeve in the sealing and isolation device with media difference of the present invention;

[0023] Figure 4 This is a structural diagram of the second sealing sleeve in the sealing and isolation device with media difference of the present invention;

[0024] Figure 5 This is a structural diagram of the plunger in the sealing and isolation device with media differences according to the present invention;

[0025] Figure 6 This is a structural diagram of the lower pressure plate in the sealing and isolation device with media difference of the present invention;

[0026] Figure 7 This is a structural diagram of the upper pressure plate in the sealing and isolation device with media difference of the present invention;

[0027] Figure 8 This is a structural diagram of the sealing and isolation device with media difference of the present invention used for static pressure support;

[0028] Figure 9 This is a structural diagram of the second sealing sleeve used for static pressure support in the sealing and isolation device with media difference of the present invention;

[0029] Figure 10This is a structural diagram of the plunger used for hydrostatic support in the sealing and isolation device with media differences according to the present invention.

[0030] Key reference numerals:

[0031] First sealing sleeve 1, third sealing sleeve 2, second sealing sleeve 301, plunger 401, clamping copper ring 5, lower pressure plate 6, first sealing ring 7, third sealing ring 8, second sealing ring 9, upper pressure plate 10, rubber sealing sleeve 11, first volume chamber 12, second volume chamber 13, third volume chamber 14, first liquid guide hole 101, first sealing groove 102, second liquid guide hole 201, second sealing groove 202, liquid tank 203, first through hole 3011. First bolt hole 3012, third liquid guide hole 3013, second bolt hole 4011, third bolt hole 4012, plum blossom hole 601, third sealing groove 602, second sealing sleeve 302 for hydrostatic support, plunger 402 for hydrostatic support, first groove 4021, first countersunk hole 4023, liquid passage hole 4022, second through hole 3021, second groove 3022, second countersunk hole 1001, third through hole 1002, spring 15. Detailed Implementation

[0032] To fully describe the technical content, structural features, objectives, and effects of this invention, a detailed description will be provided below in conjunction with the accompanying drawings.

[0033] A sealing and isolation device with media differences, such as Figure 1 and Figure 8 As shown, it includes a first sealing sleeve 1, a third sealing sleeve 2, a second sealing sleeve 301, a plunger 401, a pressing copper ring 5, a lower pressure plate 6, a first sealing ring 7, a third sealing ring 8, a second sealing ring 9, an upper pressure plate 10, and a rubber sealing sleeve 11.

[0034] The first mounting end of the upper pressure plate 10 and the first mounting end of the lower pressure plate 6 are detachably connected. The end faces of the upper pressure plate 10 and the lower pressure plate 6 are engaged. The annular groove of the upper pressure plate 10 is externally connected to the first end of the first sealing sleeve 1. The interior of the first end of the first sealing sleeve 1 is connected to the first end of the rubber sealing sleeve 11 through the clamping copper ring 5. Specifically, the first end of the clamping copper ring 5 abuts against the end face of the lower pressure plate 6 connected to the upper pressure plate 10. The second end of the clamping copper ring 5 presses the rubber sealing sleeve 11 onto the first sealing sleeve 1. A static seal is formed by installing the first sealing ring 7 and the circular through hole of the lower pressure plate 6. The rubber sealing sleeve 11 is fixed in the sealing groove of the first sealing sleeve 1 by the clamping copper ring 5 to form a static seal.

[0035] The right side of the contact portion between the first sealing sleeve 1 and the rubber sealing sleeve 11 has a through hole connected to the second fluid in the outside, which can leak some of the second fluid squeezed into the space between the rubber sealing sleeve 11 and the first sealing sleeve 1 to the outside. The rubber sealing sleeve 11 and the first sealing sleeve 1 are fixed in the static sealing part. During the movement, the compression and stretching of the non-sealing position on the rubber sealing sleeve 11 causes the rubber sealing sleeve 11 and the first sealing sleeve 1 to slide relative to each other.

[0036] The second end of the rubber sealing sleeve 11 and the first mounting end of the plunger 401 are detachably sealed together. The second mounting end of the plunger 401 and the bottom surface inside the second sealing sleeve 301 are detachably connected. The outer sidewalls of the rubber sealing sleeve 11 and the outer sidewalls of the plunger 401 are located inside the second end of the first sealing sleeve 1. Specifically, the medium inside the rubber sealing sleeve 11 is the first fluid flowing in through the liquid passage of the upper pressure plate 10, and the medium outside the rubber sealing sleeve 11 is the second fluid.

[0037] The outer side of the second end of the first sealing sleeve 1 is connected to the inner side wall of the second sealing sleeve 301. The outer side of the second sealing sleeve 301 is connected to the inner side of the third sealing sleeve 2. The outer side of the third sealing sleeve 2 is connected to the inner side of the lower pressure plate 6. The boss end of the first sealing sleeve 1 is connected to the boss end of the third sealing sleeve 2.

[0038] The second sealing ring 9 is located in the third sealing groove 602 of the lower pressure plate 6, and the first sealing ring 7 and the third sealing ring 8 are located in the second sealing groove 202 of the third sealing sleeve 2 and the first sealing groove 102 of the first sealing sleeve 1, respectively.

[0039] Specifically, the axes of the first sealing sleeve 1, the third sealing sleeve 2, the second sealing sleeve 301, the plunger 401, the clamping copper ring 5, the lower pressure plate 6, the first sealing ring 7, the third sealing ring 8, the second sealing ring 9, the upper pressure plate 10, and the rubber sealing sleeve 11 are on the same straight line.

[0040] like Figure 2 As shown, the first sealing sleeve 1 has a first sealing groove 102 along the circumferential direction at the boss of the first sealing sleeve 1, and a first liquid guiding hole 101 is provided at the position where the first sealing sleeve 1 connects with the boss of the third sealing sleeve 2. The first liquid guiding holes 101 are evenly distributed along the circumferential direction of the first sealing sleeve 1, and the opening position of the first liquid guiding hole 101 is parallel to the axis of the first sealing sleeve 1.

[0041] like Figure 3 As shown, the boss of the third sealing sleeve 2 is provided with a second sealing groove 202 along the circumferential direction. The second sealing sleeve 2 is provided with a second liquid guiding hole 201 and a liquid groove 203 at the opposite position of the boss of the first sealing sleeve 1. The second liquid guiding holes 201 are evenly distributed along the circumferential direction of the third sealing sleeve 2, and the opening position of the second liquid guiding holes 201 is perpendicular to the axis of the third sealing sleeve 2.

[0042] like Figure 4 As shown, a first through hole 3011 is provided in the middle of the bottom surface of the second sealing sleeve 301. A first bolt hole 3012 and a third liquid guiding hole 3013 are respectively provided in the circumferential direction of the bottom surface of the second sealing sleeve 301. Along the radial direction of the second sealing sleeve 301, the distance between the third liquid guiding hole 3013 and the first through hole 3011 is greater than the distance between the first bolt hole 3012 and the first through hole 3011.

[0043] like Figure 1 As shown, the interior of the rubber sealing sleeve 11 and the liquid passage hole in the middle of the upper pressure plate 10 form the first volume chamber 12. The first volume chamber 12 is a liquid volume chamber with damping holes. The interior of the first volume chamber 12 is the transmission medium. The boss connecting side of the first sealing sleeve 1, the end face of the second sealing sleeve 301 and the interior of the third sealing sleeve 2 form the second volume chamber 13. The end face of the first sealing sleeve 1, the exterior of the plunger 401 and the bottom surface of the interior of the second sealing sleeve 301 form the third volume chamber 14.

[0044] like Figure 7 As shown, the upper pressure plate 10 has a liquid passage hole in the middle and an annular groove at one end. The first sealing sleeve 1 can slide inside the annular groove. The upper pressure plate 10 has a second countersunk hole 1001 and a third through hole 1002 evenly arranged in the circumferential direction. The axes of the second countersunk hole 1001 and the third through hole 1002 are on the same straight line.

[0045] like Figure 6 As shown, a third sealing groove 602 is provided at the first mounting end where the lower pressure plate 6 connects to the upper pressure plate 10. The middle part of the first mounting end of the lower pressure plate 6 is a conical groove, and the connecting side of the conical groove is a plum blossom hole 601. The middle part of the second mounting end of the lower pressure plate 6 is a circular through hole.

[0046] like Figure 5 As shown, the plunger 401 has a second bolt hole 4011 in the middle and a third bolt hole 4012 evenly distributed in the circumferential direction of the plunger 401.

[0047] like Figure 8 As shown, in a preferred embodiment of the present invention, it further includes a second sealing sleeve 302 for hydrostatic support, a plunger 402 for hydrostatic support, and a spring 15, the spring 15 being located inside the rubber sealing sleeve 11.

[0048] like Figure 9 As shown, the second sealing sleeve 302 for static pressure support has a second through hole 3021 in the middle, and the second sealing sleeve 302 for static pressure support has a second groove 3022 uniformly provided in the circumferential direction.

[0049] like Figure 10As shown, a first groove 4021 is uniformly provided in the circumferential direction on the connection side of the plunger 402 for hydrostatic support and the second sealing sleeve 302 for hydrostatic support. A first countersunk hole 4023 is provided in the middle of the connection side of the plunger 402 for hydrostatic support and the second sealing sleeve 302 for hydrostatic support. A liquid passage hole 4022 is provided on the side wall of the plunger 402 for hydrostatic support.

[0050] The specific working process of the present invention is as follows: the first fluid is located in the first volume chamber 12, the second fluid is located in the second volume chamber 13 and the third volume chamber 14 respectively, the piston is located in the liquid passage hole of the upper pressure plate 10, and there is a certain gap between the piston and the first sealing sleeve 1 in the radial direction. When the piston makes a pushing stroke, the first fluid is forced out of the first volume chamber 12, and the second volume chamber 13 and the third volume chamber 14 are squeezed. The second fluid in the second volume chamber 13 will lubricate the relative friction pair between the second sealing sleeve 301 and the first sealing sleeve 1 and the third sealing sleeve 2. The second fluid in the third volume chamber 14 will enter the gap between the first sealing sleeve 1 and the piston and the rubber isolation sleeve 11 and the first sealing sleeve 1 to play a lubricating role. The excess second fluid will flow to the first volume chamber 12 along the first liquid guide hole 101 on the first sealing sleeve 1 and be discharged into the pump body.

[0051] When the piston makes its return motion, the first fluid is drawn into the first volume chamber 12, the second volume chamber 13 and the third volume chamber 14 become larger, and the second fluid is drawn from the inside of the pump body along the plum blossom hole 601 on the lower pressure plate 6 into the second volume chamber 13. At the same time, the second fluid is drawn back into the second volume chamber 13 along the third liquid guide hole 3013 on the second sealing sleeve 302.

[0052] When the piston performs its pushing stroke, the second fluid is isolated from the first fluid through the rubber sealing sleeve 11. At the same time, the second fluid will enter the gap between the rubber sealing sleeve 11 and the first sealing sleeve 1 along the plunger 401 to prevent the rubber sealing sleeve 11 from wearing.

[0053] When the piston returns to its original position, the second sealing sleeve 301 draws a second fluid from inside the pump body to lubricate the friction pair between the second sealing sleeve 301, the first sealing sleeve 1, and the third sealing sleeve 2, and draws the first fluid into the interior of the rubber sealing sleeve 11.

[0054] The present invention will be further described below with reference to embodiments:

[0055] This invention has two working states: push stroke and return stroke. The specific working process is as follows:

[0056] In the push-stroke state, the liquid passage hole in the middle of the upper pressure plate 10 and the interior of the rubber sealing sleeve 11 form the first volume chamber 12. In this specific embodiment, the medium of the first volume chamber 12 is a first fluid or emulsion, and the medium of the second volume chamber 13 and the third volume chamber 14 is a second fluid.

[0057] The plunger 401 squeezes the rubber sealing sleeve 11 to discharge the first fluid or emulsion in the first volume chamber 12 from the third through hole 1002 of the upper pressure plate 10 to the distribution area. As the plunger 401 moves, the second sealing sleeve 301 moves, and the first sealing sleeve 1 and the third sealing sleeve 2 remain stationary. Due to the relative movement of the sealed space structure, the volume of the second volume chamber 13 and the third volume chamber 14 decreases.

[0058] A portion of the second fluid in the second volume chamber 13 is discharged from the second liquid guide hole 201 on the third sealing sleeve 2, and then discharged into the pump along the plum blossom hole 601 on the lower pressure plate 6. Another portion of the second fluid enters the contact surface between the first sealing sleeve 1 and the second sealing sleeve 301, and the contact surface between the second sealing sleeve 301 and the third sealing sleeve 2, forming a lubricating film for lubrication. A portion of the second fluid in the third volume chamber 14 flows from the gap between the plunger 401 and the first sealing sleeve 1 into the contact surface between the rubber sealing sleeve 11 and the first sealing sleeve 1, forming a lubricating film for lubrication. Excess second fluid flows into the second volume chamber 13 from the first liquid guide hole 101 on the first sealing sleeve 1 along the gap between the rubber sealing sleeve 11 and the first sealing sleeve 1. Another portion of the second fluid enters the contact surface between the second sealing sleeve 301 and the first sealing sleeve 1, forming a lubricating film for lubrication. More second fluid flows back into the pump body along the third liquid guide hole 3013 on the second sealing sleeve 301.

[0059] In the return stroke, plunger 401 stretches the rubber sealing sleeve 11, increasing the volume of the first volume chamber 12 and drawing in the first fluid or emulsion from the distribution area of ​​the third through hole 1002 of the upper pressure plate 10. As plunger 401 returns, the second sealing sleeve 301 also returns, while the first sealing sleeve 1 and the third sealing sleeve 2 remain stationary. Due to the relative movement of the sealed space structure, the volumes of the second volume chamber 13 and the third volume chamber 14 increase. The second volume chamber 13 draws the second fluid back into itself through the second liquid guide hole 201 on the third sealing sleeve 2 along the plum blossom hole 601 on the lower pressure plate 6, preparing for lubrication during the push stroke. The third volume chamber 14 draws the second fluid back into itself through the third liquid guide hole 3013 on the second sealing sleeve 301, preparing for lubrication during the push stroke.

[0060] This specific embodiment applies the device of the present invention to a hydrostatic support, and the specific structure is as follows: Figure 8 As shown, the sealing and isolation device used for hydrostatic support has two working states: push stroke and return stroke. The specific working process is as follows:

[0061] The second groove 3022 of the second sealing sleeve 302 for hydrostatic support and the first groove 4021 of the plunger 402 for hydrostatic support are used to form a thin film. The plunger 402 for hydrostatic support is installed at the second through hole 3021 in the second sealing sleeve 302. The second groove 3022 and the first groove 4021 are on the same plane. The plunger 402 for hydrostatic support has several fluid passage holes 4022. The first countersunk hole 4023 on the plunger 402 for hydrostatic support is connected to the second fluid source at the shaft end, forming a constant pressure chamber. The spring 15 is detachably connected to the upper pressure plate 10.

[0062] In the push stroke state, the liquid passage hole in the middle of the upper pressure plate 10 and the interior of the rubber sealing sleeve 11 form the first volume chamber 12. In this specific embodiment, the medium of the first volume chamber 12 is the first fluid or emulsion, and the medium of the second volume chamber 13 and the third volume chamber 14 is the second fluid. The plunger 402 for static pressure support squeezes the rubber sealing sleeve 11 to discharge the first fluid or emulsion of the first volume chamber 12 from the upper pressure plate 10 to the distribution area. At the same time, the compression spring 15 deforms to prepare for the return stroke.

[0063] The boss connecting side of the first sealing sleeve 1, the end face of the second sealing sleeve 302 for hydrostatic support, and the interior of the third sealing sleeve 2 form the second volume cavity 13. The end face of the first sealing sleeve 1, the exterior of the plunger 402 for hydrostatic support, and the bottom surface of the interior of the second sealing sleeve 302 for hydrostatic support form the third volume cavity 14. As the plunger 402 for hydrostatic support moves, the second sealing sleeve 302 for hydrostatic support also moves. The first sealing sleeve 1 and the third sealing sleeve 2 remain stationary. Due to the relative movement of the sealed space structure, the volumes of the second volume cavity 13 and the third volume cavity 14 decrease. The second groove 3022 and the first groove 4021 are connected to the high-pressure second fluid injected into the shaft end, which can form a hydrostatic support film to support lubrication under heavy loads.

[0064] A portion of the second fluid in the second volume chamber 13 is discharged from the second liquid guide hole 201 on the third sealing sleeve 2 and discharged into the pump along the plum blossom hole 601 on the lower pressure plate 6. Another portion of the second fluid enters the contact surface between the first sealing sleeve 1 and the second sealing sleeve 301 and the contact surface between the second sealing sleeve 301 and the third sealing sleeve 2, forming a lubricating film to play a lubricating role.

[0065] A portion of the second fluid in the third volume chamber 14 flows into the contact surface between the rubber sealing sleeve 11 and the first sealing sleeve 1 through the gap between the plunger 402 for hydrostatic support and the first sealing sleeve 1, forming a high-pressure film to protect the rubber sealing sleeve 11 during the pushing stroke, preventing it from being punctured by the high-pressure first fluid or emulsion and reducing wear between the rubber sealing sleeve 11 and the first sealing sleeve 1. Meanwhile, excess second fluid flows out from the first liquid guide hole 101 on the first sealing sleeve 1 into the second volume chamber 13 and is finally discharged. Another portion of the second fluid enters the contact surface between the second sealing sleeve 302 for hydrostatic support and the first sealing sleeve 1, forming a lubricating film for lubrication. The remaining second fluid flows back into the constant pressure chamber of the first counterbore 4023 along the liquid passage hole 4022 on the plunger 402 for hydrostatic support.

[0066] In the return stroke, spring 15 stretches rubber sealing sleeve 11, increasing the volume of the first volume chamber 12. The first fluid or emulsion is drawn in from the distribution area of ​​the third through hole 1002 of the upper pressure plate 10. As the plunger 402 for hydrostatic support returns, the second sealing sleeve 302 for hydrostatic support also returns. The first sealing sleeve 1 and the third sealing sleeve 2 remain stationary. Due to the relative movement of the sealed space structure, the volumes of the second volume chamber 13 and the third volume chamber 14 increase. The second volume chamber 13 draws the second fluid back into the volume chamber through the second liquid guide hole 201 on the third sealing sleeve 2 along the plum blossom hole 601 on the lower pressure plate 6, preparing for lubrication during the push stroke. The third volume chamber 14 draws the second fluid back into the volume chamber through the liquid passage hole 4022 on the plunger 402 for hydrostatic support, preparing for lubrication during the push stroke.

[0067] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A sealed isolation device with medium difference, comprising a first sealing sleeve, a third sealing sleeve, a second sealing sleeve, a plunger, a compression copper ring, a lower pressing plate, a first sealing ring, a third sealing ring, a second sealing ring, an upper pressing plate and a rubber sealing sleeve, characterized in that, a first mounting end of the upper pressing plate and a first mounting end of the lower pressing plate are connected, a circular ring-shaped slot hole of the upper pressing plate and an outer part of a first end of the first sealing sleeve are connected, an inner part of the first end of the first sealing sleeve is connected through the compression copper ring and a first end of the rubber sealing sleeve, a second end of the rubber sealing sleeve and a first mounting end of the plunger are connected, a second mounting end of the plunger and a bottom surface of an inner part of the second sealing sleeve are connected, a side wall of an outer part of the rubber sealing sleeve and a side wall of an outer part of the plunger are respectively located in an inner part of a second end of the first sealing sleeve, an outer part of the second end of the first sealing sleeve and a side wall of an inner part of the second sealing sleeve are connected, an outer part of the second sealing sleeve and an inner part of the third sealing sleeve are connected, an outer part of the third sealing sleeve and an inner part of the lower pressing plate are connected, a boss end of the first sealing sleeve and a boss end of the third sealing sleeve are connected; a first sealing groove is arranged at the boss of the first sealing sleeve in the circumferential direction, the first sealing sleeve is provided with first liquid guide holes at the position connected with the boss of the third sealing sleeve, the first liquid guide holes are uniformly distributed along the circumferential direction of the first sealing sleeve, and the opening positions of the first liquid guide holes are parallel to the axis of the first sealing sleeve; the boss of the third sealing sleeve is provided with a second sealing groove in the circumferential direction, the third sealing sleeve is respectively provided with a second liquid guide hole and a liquid groove at the opposite position connected with the boss of the first sealing sleeve, the second liquid guide holes are uniformly distributed along the circumferential direction of the third sealing sleeve, and the opening positions of the second liquid guide holes are perpendicular to the axis of the third sealing sleeve; a first through hole is arranged in the middle of the bottom surface of the second sealing sleeve, and a first bolt hole and a third liquid guide hole are respectively arranged in the circumferential direction of the bottom surface of the second sealing sleeve; the inner part of the rubber sealing sleeve and the liquid passage hole in the middle part of the upper pressing plate constitute a first volume cavity, the first volume cavity is a liquid volume cavity with damping holes, the boss connection side of the first sealing sleeve, the end surface of the second sealing sleeve and the inner part of the third sealing sleeve constitute a second volume cavity, and the end surface of the first sealing sleeve, the outer part of the plunger and the bottom surface of the inner part of the second sealing sleeve constitute a third volume cavity.

2. The sealed isolation device with dielectric disparity of claim 1, wherein, the middle part of the upper pressing plate is provided with a liquid passage hole, one end of the liquid passage hole is provided with a circular ring-shaped slot hole, the circumferential direction of the upper pressing plate is uniformly provided with a second counterbore and a third through hole, and the axes of the second counterbore and the third through hole are on the same straight line.

3. The sealed isolation device with dielectric disparity of claim 1, wherein, the first mounting end of the lower pressing plate connected with the upper pressing plate is provided with a third sealing groove, the middle part of the first mounting end of the lower pressing plate is a conical groove, the connection side of the conical groove is a torx hole, and the middle part of the second mounting end of the lower pressing plate is a circular through hole.

4. The sealed isolation device with dielectric disparity of claim 1, wherein, the middle part of the plunger is provided with a second bolt hole, and the circumferential direction of the plunger is uniformly provided with a third bolt hole.

5. The sealed isolation device with dielectric disparity of claim 1, wherein, The second sealing ring is located in a third sealing groove of the lower pressing plate, and the first sealing ring and the third sealing ring are respectively located in a second sealing groove of the third sealing sleeve and a first sealing groove of the first sealing sleeve.

6. The sealed isolation device with dielectric disparity of claim 1, wherein, In the second sealing sleeve, along a radial direction of the second sealing sleeve, a distance between the third liquid guide hole and the first through hole is greater than a distance between the first bolt hole and the first through hole.

7. The sealed isolation device with dielectric disparity of claim 1, wherein, The first sealing sleeve, the third sealing sleeve, the second sealing sleeve, the plunger, the compression copper ring, the lower pressing plate, the first sealing ring, the third sealing ring, the second sealing ring, the upper pressing plate, and the rubber sealing sleeve are on the same straight line.

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