1205results about "Piston rings" patented technology

The invention discloses an anti-liquid-impact compressor cylinder structure, a compressor and a wellhead natural gas compression method, and relates to the technical field of compressors, the cylinder structure comprises a cylinder barrel and a piston ring assembly, a piston cavity is formed in the cylinder barrel, the cylinder structure further comprises a partition plate, the partition plate divides the piston cavity into a working cavity and a buffering cavity, and the piston ring assembly is arranged in the working cavity; the communication channel is used for realizing mutual communication of the working cavity and the buffer cavity on the two sides of the partition plate; the partition plate is configured in the mode that when the pressure difference between the pressure of the working cavity and the pressure of the buffer cavity exceeds a set threshold value, the fixed relation of the partition plate in the piston cavity is damaged under the pressure difference between the two sides of the partition plate, the partition plate can move towards the side where the buffer cavity is located under the pressure difference, the compressor comprises the cylinder body structure, and the compression method is achieved based on the cylinder body structure. According to the scheme, the maximum pressure in the cylinder is reduced by adopting a method of expanding the clearance volume of the cylinder body when the liquid impact phenomenon occurs, and the response speed in the clearance volume expanding process can be effectively optimized.

A wear-resistant and low-friction coated piston ring and a preparation method therefor are provided. The OD surface diamond-like carbon coating consists sequentially of a first metal interlayer, a second metal interlayer, a gradient DLC layer, alternating high / low hardness DLC layers, and an outer running-in DLC layer. The side surface diamond-like carbon coating consists sequentially of a metal interlayer, a gradient DLC layer, and alternating high / low hardness DLC layers. The preparation method employs physical vapor deposition to sequentially deposit composite DLC coatings on the OD surface and side surface of the piston ring. The coating is a tetrahedral amorphous carbon structure, exhibiting good thickness uniformity and fine grain structure. This improves the wear resistance of the piston ring's OD surface and side surface, reduces the aggressiveness of the piston ring side surface against the piston ring groove, and meanwhile avoids adhesion.

The invention relates to the technical field of compressors, and discloses a gas piston assembly for an ultrahigh-pressure liquid-driven piston compressor, which comprises a gas piston main body, a sealing piece and a connecting piece, the air piston body comprises a first body part and a second body part which are oppositely arranged, a cylindrical protruding part is arranged in the center of the end face of one side of the first body part, and a positioning inserting hole matched with the cylindrical protruding part is formed in the center of the end face of the side, right opposite to the first body part, of the second body part. The sealing piece comprises a plurality of first piston rings and a plurality of second piston rings, the first piston rings and the second piston rings are arranged on the cylindrical protruding part in a sleeving mode and are alternately arranged, and the first piston rings are arranged close to the end face of the first main body part; the connecting piece is used for connecting the first main body part and the second main body part together after the cylindrical lug boss is inserted into the positioning insertion hole; the combined piston ring is used for replacing a traditional spring plug structure for sealing, and the sealing problem caused by extremely high pressure and temperature under the ultrahigh pressure working condition can be solved.

A piston ring for an internal combustion engine may include an annular base body and a protective coating arranged on an outer circumference of the base body. The base body may include a first joint flank, a second joint flank, an interruption along the circumferential direction, an axial end face, and an edge formed between the first joint flank and the end face. The interruption may form a joint bounded along a circumferential direction of the base body via the first joint flank and the second joint flank. The axial end face may include a radially outer surface section extending perpendicularly to a central longitudinal axis of the base body and merging radially inwards into a radially inner surface section extending at an obtuse angle to the central longitudinal axis. The edge may include a chamfer.

The invention provides an anti-sticking perfluoroether rubber sealing assembly and a preparation method and application thereof, the preparation method comprises the following steps: mixing perfluoroether rubber with a vulcanizing agent to obtain a rubber compound, and performing high-temperature vulcanization on the rubber compound to obtain a perfluoroether rubber product; carrying out surface roughening treatment on the perfluoroether rubber product; dispersing amorphous fluororesin in the fluorinated liquid to obtain coating slurry; and coating the roughened perfluoroether rubber product with the coating slurry, and carrying out segmented heating and drying to obtain the perfluoroether rubber sealing assembly. According to the anti-sticking perfluoroether rubber sealing assembly as well as the preparation method and the application thereof, the obtained perfluoroether rubber sealing assembly has relatively low friction coefficient, excellent plasma corrosion resistance and relatively small viscous force, shows excellent non-sticking performance, and can be suitable for different environments.

The present disclosure provides a sealing ring assembly having a first ring and a second ring, configured to seal a high-pressure region from a lower pressure region of a piston and cylinder device. Accordingly, the sealing ring assembly includes a high-pressure boundary and a low-pressure boundary. Each ring may be segmented, and the first and second rings interface along a surface. Along the surface at the interface, a groove open to the lower pressure region aids in pressure locking the sealing ring assembly. A pocket in the second ring allows for high pressure gas to aid in balancing radial forces on the sealing ring assembly. As the sealing ring wears, the first and second rings remain engaged with one another.

A combined piston ring used for a new energy hybrid power automobile engine belongs to the technical field of engines and comprises a ring body inner plate in contact with the inner side face of a main body mechanism, an ash discharge groove formed in the ring body inner plate, a scraping plate installed in a groove formed in the ring body inner plate and a plurality of shaking reeds evenly distributed between the two ring bodies. The scraping plate is in contact with the inner wall of a groove formed in the piston; in the working process of an engine, residual carbon deposits on the inner wall of a groove formed in a piston are scraped off in the rotating process of a scraping plate, the carbon deposits enter an ash discharging groove along an inclined face arranged on the scraping plate, a connecting plate makes contact with a shaking reed in the rotating process so that the shaking reed can be intermittently compressed and bounced off, the carbon deposits in the shaking reed can be prevented from being accumulated into blocks, and the service life of the connecting plate is prolonged. The carbon deposition can be effectively prevented from being accumulated in a gap between the piston ring and the piston, the piston ring is blocked, and the work of the piston is influenced.

The utility model provides a main plunger sealing device of a solid pump, which is arranged between a plunger guide cylinder and a main plunger of the solid pump, is positioned at the front end of the plunger guide cylinder, and comprises an annular mounting seat, an annular scraper, a check ring, a combined seal, a copper sleeve and a gland which are sequentially arranged, a flange protruding inwards is arranged at the front end of the annular mounting seat; the gland is connected with the rear end of the annular mounting base, and the annular scraper, the check ring, the combined seal and the copper sleeve are fixed and pressed between the flange and the gland; the annular scraper is formed by splicing at least three arc-shaped sub-scrapers, and gaps are formed among the sub-scrapers; blades are arranged on the inner sides of the sub-scrapers, and grooves are formed in the outer sides of the sub-scrapers in the circumferential An annular elastic piece is integrally arranged in a groove of the annular scraper in a sleeved mode, so that the sub-scraper is shrunk inwards and pressed to the outer surface of the main plunger. The main plunger sealing device is good in sealing performance and not prone to material leakage; the scraper is more strongly attached to the outer surface of the main plunger, so that materials adhered to the outer surface of the main plunger can be better scraped; and the sealing device is not easy to corrode after long-term use.

The invention relates to the technical field of sealing rings, and discloses a wide-temperature-zone sealing ring which comprises a sealing ring body, the sealing ring body comprises a sealing layer, a thin film layer and a compensation layer, the outer portion of the thin film layer is arranged in the sealing layer, and the outer portion of the compensation layer is arranged in the thin film layer; the sealing layer and the thin film layer are supported by different materials and are made of fully-sealed elastic flexible materials, and the thickness of the thin film layer is smaller than that of the sealing layer; the compensation layer and the sealing layer are supported by different materials, and the linear expansion of the materials of the compensation layer and the sealing layer is opposite; the thickness of the compensation layer is inversely proportional to the thickness of the sealing layer according to the linear expansion coefficients of the two materials. The materials of the sealing layer and the compensation layer are selected, so that the compensation layer expands at low temperature to offset lost sealing pressure, the compensation layer shrinks at high temperature to buffer excessive extrusion, uniform contact stress of the sealing ring is maintained in extreme temperature fluctuation, and the effect of zero-damage self-adaptive sealing in the whole temperature range is achieved.

The invention relates to the field of shear tests, in particular to a shear test driving oil cylinder which comprises a splitting mechanism used for providing a test environment, a fixing seat and an external mechanism, the external mechanism is provided with the fixing seat used for installing a test block, and the upper side of the fixing seat is provided with a splitting mechanism used for splitting the test block. An oil cylinder mechanism used for providing power is installed at the upper end of the splitting mechanism, the adjusting mechanism is used for adjusting the internal sealing environment of the oil cylinder mechanism and providing stress release for the oil cylinder mechanism, the oil cylinder mechanism comprises an oil cylinder body, and a sealing plug is arranged at an opening in the bottom of the oil cylinder body; the piston rod penetrates through the sealing plug and is connected with a pressure applying piston assembly located in the center inside the oil cylinder body. The device is used for solving the technical problem that a sealing ring of a piston part is damaged due to instant impact force caused by a water hammer effect of oil liquid due to instant pressure loss of the piston part in a pressure applying oil cylinder at the top after bottom concrete is instantly cracked in a high-pressure environment shear test process.

A sealing ring includes a first sealing element having a first mating surface and a second sealing element having a second mating surface. A high-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element, anda low-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element. The first mating surface, the second mating surface, or both, includes a recess open to the low-pressure boundary and not open to the high-pressure boundary. The recess may include a groove, for example. The first mating surface is sealed against the second mating surface by a first force acting on the first sealing element and a second force acting on the second sealing element. These forces act to pressure-lock the assembly.

A piston ring and a method of manufacturing a piston ring for a piston of a reciprocating internal combustion engine. The piston ring comprises a body having an outer circumferential surface. A tribological coating is formed on the outer circumferential surface of the body. The tribological coating has a dual layer or a triple layer structure and includes a relatively hard base layer and a relatively porous top layer overlying the base layer. The tribological coating may be provided with varying thickness such that its thickness increases gradually from 90° towards 0° in a first radial direction of the piston ring and from 270° towards 360° in a second radial direction of the piston ring reaching its maximum value in the region of 0° and 360°, i.e. the tips of the piston ring.

An annular seal for use in a hydraulic device provides a static seal between two components of the hydraulic device that do not move relative to each other. The annular seal has a cross-section that is substantially M-shaped along one of an inner diameter circumferential surface of the annular seal or an outer diameter circumferential surface of the annular seal. The other of the inner diameter circumferential surface or the outer diameter circumferential surface of the annular seal includes opposite side cylindrical portions extending substantially parallel to a central axis of the annular seal with a concave central portion disposed between the opposite side cylindrical portions.

The utility model discloses an anti-corrosion sealing ring which comprises a sealing ring body, and an extrusion boss is fixed on the lower end face of the sealing ring body. Clamping grooves are evenly formed in the upper end face of the sealing ring body, a corrosion-resistant layer is arranged on the outer side of the sealing ring body, and protruding blocks are fixed to the corrosion-resistant layer. An annular cavity is formed in the sealing ring body, the annular cavity is connected with an air guide groove, the air guide groove is connected with an expansion cavity, meanwhile, the air guide groove and the expansion cavity are formed in the sealing ring body, and the sealing ring body is made of ethylene propylene rubber. According to the anti-corrosion sealing ring, the inner and outer double-layer sealing ring structural design is adopted, the sealing effect can be guaranteed through the sealing ring body, the sealing ring body can be prevented from being directly contacted with corrosive liquid to be corroded and damaged in cooperation with the effect of the anti-corrosion layer, and the service life of the sealing ring body is guaranteed; the sealing effect can be further improved, and liquid leakage is avoided.

The piston ring assembly having a first and a second endless sealing ring and an elastic ring carrier, the first and the second sealing ring extending in a circumferential direction (U) and each having an outer circumferential surface, the first sealing ring having a first center point (M1) with respect to its outer circumferential surface and the second sealing ring having a second center point (M2) with respect to its outer circumferential surface, the first and second sealing rings each having a longitudinal axis (L) running perpendicular to the circumferential direction (U), wherein the ring carrier runs in the circumferential direction (U), and wherein the ring carrier and the first and second sealing rings are designed to be mutually adapted in such a way that the first and second sealing rings are arranged one after the other in the ring carrier in the direction of the longitudinal axis (L), and in that their first and second centers (M1, M2) are arranged at a distance from one another radially with respect to the longitudinal axis (L), the sealing rings being pressed in opposite directions against the inner wall of a cylinder when the piston ring assembly is used in accordance with the invention.

A gas turbine engine (20) includes a rotor (62) that has a seal surface (68) and a shaft (70) that is rotatable about an engine central axis (A). The shaft has an annular seal channel (72) that opens to the seal surface. An annular seal (74) is insertable into the annular seal channel for sealing against the seal surface. The annular seal is comprised of first and second rings (76, 78) that each have a split joint (80), a slot (82) radially adjacent the split joint, and a tab (84) that projects into the slot of the other of the first or second rings such that the first and second rings are circumferentially interlocked.

A sealing ring includes a first sealing element having a first mating surface and a second sealing element having a second mating surface. A high-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element, and a low-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element. The first mating surface, the second mating surface, or both, includes a recess open to the low-pressure boundary and not open to the high-pressure boundary. The recess may include a groove, for example. The first mating surface is sealed against the second mating surface by a first force acting on the first sealing element and a second force acting on the second sealing element. These forces act to pressure-lock the assembly.

A control device includes a housing having a base portion and an extension portion. The base portion of the housing has an inward facing side and an outward facing side. The control device includes a lever coupled to and pivotable relative to the housing, and a master cylinder portion supported by the housing. The master cylinder portion has a hollow fluid cylinder. The control device also includes a piston assembly supported by the housing. The piston assembly is movable relative to the master cylinder portion. At least part of the piston assembly is disposed within the master cylinder portion. The master cylinder portion is angled relative to the outward facing side of the base portion of the housing, such that the first end of the fluid cylinder is closer to the outward facing side than the second end of the fluid cylinder is relative to the outward facing side.

A piston ring includes an annular main body portion having an inner peripheral surface, an outer peripheral surface, and one side surface and the other side surface. The piston ring includes a first curved surface provided on the outer peripheral surface, being convexly curved outwards in a radial direction of the main body portion, a second curved surface provided on the outer peripheral surface, being convexly curved outwards in the radial direction of the main body portion, and an intermediate surface formed to extend in a direction connecting the one side surface to the other side surface connecting the first curved surface to the second curved surface. The intermediate surface has a flat portion formed in at least a part thereof. The width of the intermediate surface in the direction connecting the one side surface to the other side surface is 0.05 mm or more and 0.30 mm or less.

The invention relates to the technical field of piston rings, in particular to a combined piston ring with air guide grooves. Comprising a first gas ring, a second gas ring and a third gas ring, a gas guide groove is formed in the inner side of the second gas ring, the third gas ring is located at the gas guide groove, the first gas ring is arranged on the second gas ring and the third gas ring, and the first gas ring, the second gas ring and the third gas ring are arranged in a first piston ring groove in the top of a piston. The opening positions of the piston rings on the upper layer and the lower layer are not changed through the function of the air wedge, so that the piston rings are finally located at the set positions, gaps, welding convex points and grooves are not machined in the planes of the piston rings in the combined ring, and the whole body is not provided with stress concentration points and is reasonable in structure, easy to machine, easy to assemble and low in cost. Meanwhile, engine power is increased, heat efficiency is high, a series of problems caused by cylinder pressure drop after air leakage due to abrasion of a piston ring and an air cylinder are avoided, and the engine is more reliable, energy-saving and environment-friendly.

The invention discloses a thermoplastic polyimide composite material for piston ring, a preparation method and a piston ring, which are composed of the following materials by mass percentage: thermoplastic polyimide 60-70; polyetheretherketone 10-20; modified carbon fiber 10-15; graphene oxide 5-10; chain extender 1-3; lubricant 1-2; antioxidant 0.5-1. The disadvantages of high wear rate, high linear expansion coefficient and inability to withstand high temperature of traditional piston rings are solved; the modification of carbon fiber reduces the probability of fiber shedding during the wear process, and reduces furrow wear and adhesive wear. The addition of graphene oxide further reduces the friction coefficient of the composite material, and a stable lubrication transfer film can be generated under long-term high load, solving many difficulties in the melt blending processing of thermoplastic polyimide high-temperature materials.

To provide a reciprocating pump having a piston ring exhibiting higher sealing performance.SOLUTION: The reciprocating pump includes: a pump main body having a piston that compresses a liquid and a cylinder that covers the piston from the outside; a drive unit for reciprocating the piston in a reciprocating direction; and a piston ring provided in a gap between the piston and the cylinder. An annular groove is formed on an outer peripheral surface of the piston. A space inside the cylinder is partitioned by the piston ring into a high-pressure region through which the compressed liquid flows and a low-pressure region in which an internal pressure is lower than that in the high-pressure region. The piston ring has a high-pressure-side ring disposed on a high-pressure-region side in the annular groove and a low-pressure-side ring provided on a low-pressure-region side in the annular groove with respect to the high-pressure-side ring. A cutout surface that retreats toward the high-pressure-region side is formed at an end edge on an outer peripheral side of a surface facing the low-pressure-region side in the low-pressure-side ring.SELECTED DRAWING: Figure 4

The invention provides a hollow piston rod hydraulic cylinder with an equal reciprocating speed and a middle through oil way structure, and belongs to the field of design and manufacturing of piston rod type hydraulic cylinders and design of hydraulic systems, the hollow piston rod hydraulic cylinder comprises a hydraulic cylinder shell, a hollow piston rod and a moving carrier, and the hollow piston rod is arranged in the hydraulic cylinder shell; a single-action hydraulic cylinder is installed on the moving carrier and connected with a cavity of the hollow piston rod through a connecting oil way of the moving carrier. Due to the arrangement of the middle oil pipe, the acting areas of the two ends of the piston of the hydraulic cylinder are approximately equal, and the device can control the moving carrier to reciprocate at the same speed by controlling the stretching of the hollow piston rod hydraulic cylinder; through the middle oil pipe at the cylinder bottom and the cavity structure of the hollow piston rod, the function of oil passing inside the piston rod is achieved, arrangement of an external oil pipe oil way is avoided, and the hydraulic pipeline design problem of a moving carrier provided with a hydraulic system or a hydraulic executing mechanism under the moving working condition is solved.

A control device includes a housing having a base portion and an extension portion. The base portion of the housing has an inward facing side and an outward facing side. The control device includes a lever coupled to and pivotable relative to the housing, and a master cylinder portion supported by the housing. The master cylinder portion has a hollow fluid cylinder. The control device also includes a piston assembly supported by the housing. The piston assembly is movable relative to the master cylinder portion. At least part of the piston assembly is disposed within the master cylinder portion. The master cylinder portion is angled relative to the outward facing side of the base portion of the housing, such that the first end of the fluid cylinder is closer to the outward facing side than the second end of the fluid cylinder is relative to the outward facing side.

A method for laser treating a substrate of a piston seal ring (PSR) (20) for a gas turbine engine includes: deforming the substrate to place a portion (310) of a first surface (30) of the substrate in tensile stress; and while holding the substrate deformed, laser treating the portion (310). After the laser treating but before release of the deformation, the first surface (30) may remain in tensile stress. Release of the deformation then at least partially cancels the tensile stress.

The invention relates to the field of fluid control devices in semiconductor liquid paths, and provides a precise control on-off valve for a semiconductor liquid path and an assembling method thereof, and the precise control on-off valve comprises a valve seat, a cylinder assembly combined on the valve seat, a diaphragm valve plate accommodated in the valve seat, and an adjusting wheel arranged on an upper cover of the cylinder. The air cylinder assembly comprises an air cylinder upper cover and an air cylinder body which are connected through a rotary lock catch structure, and a piston assembly and a limiting rod set are assembled in the air cylinder assembly. And the diaphragm valve plate is driven by the cylinder assembly to seal or separate from the valve port of the valve seat. The adjusting wheel is connected with the limiting rod set and used for adjusting lifting of the limiting lead screw, and then the maximum upward moving position of the piston assembly and the opening degree of the valve are precisely limited. The valve breaks through the bottleneck that a traditional mechanical valve is prone to abrasion and leakage, achieves the effect of precise fine adjustment of flow, and meanwhile greatly improves the flow stability of long-term operation and the clean safety of an ultra-pure fluid system.

A sliding arrangement for use in an internal combustion engine is described, comprising a cylinder liner (1) and at least one piston ring (10), wherein the liner (1) has a through-bore defining an inner surface (S) which in turn defines three sections: a first section (2) near the end of the piston stroke, facing the cylinder head (at top dead center, TDC); a second, middle section (3); and a third section (4) near the end of the piston stroke, facing the crankshaft of the engine (at top dead center, TDC), wherein (i) the TDC section (2) of the liner (1) has a surface finish with a first roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”); the middle section (3) of the liner (1) has a surface finish with a second roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”);(1) the BDC section (4) of the cylinder liner (1) has a surface finish with a third roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”), and the roughness value of the middle section (3) is significantly lower than the roughness value of the TDC section (2), and is defined by an essentially very smooth structure of recesses and projections (“valleys” and “raised areas”); and (ii) a ceramic coating (R) is applied to at least part of the contact surface of the piston ring (10) by the physical vapor deposition (PVD) process.

Provided is a piston ring including: a low-pressure side ring; and a high-pressure side ring, the low-pressure side ring and the high-pressure side ring are arranged stacked in a direction along the axis so that the high-pressure side ring is closer to a fluid to be compressed, a low-pressure side rotation restriction part configured to restrict rotation in the circumferential direction relative to the piston is formed to the low-pressure side ring, a high-pressure side rotation restriction part configured to restrict rotation in the circumferential direction relative to the piston and a low-pressure side protrusion protruding toward the low-pressure side ring and inserted in the low-pressure side abutment are formed to the high-pressure side ring, and the low-pressure side protrusion is inserted in a low-pressure side abutment with clearances being provided in both sides in the circumferential direction between the low-pressure side ring and the low-pressure side protrusion.

Piston ring having a first annular body and a second annular body, which annular bodies, are arranged adjacent to and concentric with one another in the axial direction (A), the first annular body having a radially outwardly directed outer side, an upper and a lower flank and a radially inwardly directed inner side, the second annular body being designed as a segmented sealing ring having a plurality of sealing ring segments, which sealing ring segments each have a radially outwardly directed sealing surface, an up-per and a lower sealing ring segment flank and a radially inwardly directed inner side, the sealing ring segments each being guided on the first annular body by means of at least one guide means, which guide means substantially prevent twisting of the sealing ring segments against the first annular body in the circumferential direction (U) and permit displacement of the sealing ring segments transversely to the axial direction (A).

A piston unit adapted to reciprocate in a cylinder includes a piston and a top land member attached to the piston. The piston includes a first portion including a piston end at one end surface side and fitted with the top land member. The first portion has a smaller outer diameter than a second portion such that there is a step therebetween. The second portion is the other portion of the piston than the first portion. The top land member has a groove wall forming surface opposed to a step surface that connects the outer circumferential surface of the first portion and the outer circumferential surface of the second portion. The first ring groove is defined by the groove wall forming surface, the step surface, and the outer circumferential surface of the first portion.