1459 results about "Piston ring" patented technology

The invention relates to the technical field of piston ring group wear monitoring, in particular to a piston ring group wear life prediction method and system. The method comprises the following steps: collecting working state data of a piston ring group in real time, de-noising by using improved wavelet transform, processing missing data by using a KNN interpolation method, standardizing and normalizing the processed data, adopting a filtering label generation and auditing mechanism to ensure the ordered homogeneity of the data, and constructing an over-limit learning machine model to obtain a piston ring group model; a hidden layer weight and an offset vector are randomly generated to calculate a hidden layer output matrix, a whale optimization algorithm is adopted to optimize model parameters, the prediction precision is improved, then the residual life is predicted, a final prediction result is used for calculating a fault risk coefficient and comparing the fault risk coefficient with a preset threshold value, maintenance suggestions are provided, and real-time data and the prediction result are displayed. And a user is assisted to make a maintenance decision. The advanced signal processing technology and the machine learning algorithm are combined, and the maintenance efficiency of the piston ring set and the reliability of equipment operation are improved.

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.

The invention discloses a wellhead natural gas compressor cylinder body structure, a compressor and a working method of the compressor, and relates to the technical field of compressors, the cylinder body structure comprises a cylinder barrel, the cylinder barrel comprises an outer cylinder barrel and an inner cylinder barrel, the inner cylinder barrel is embedded in a center hole of the outer cylinder barrel, and a piston cavity of the cylinder barrel is formed by a center hole of the inner cylinder barrel; the inner wall of the outer cylinder barrel and the outer wall of the inner cylinder barrel are each provided with a spiral groove with a semi-annular cross section, the spiral grooves of the outer cylinder barrel and the outer wall of the inner cylinder barrel define a spiral flow channel which extends in the axis direction of the cylinder barrel, the cross section of the spiral flow channel is annular, and the spiral flow channel is provided with a medium leading-in hole and a medium leading-out hole which are located in the surface of the outer cylinder barrel. The compressor comprises the cylinder body structure, and the working method is the working method of the compressor. According to the scheme, the temperature difference of different positions of the inner wall of the cylinder can be effectively reduced, the purposes of reducing air leakage of a piston ring and optimizing the volume of the compressor are achieved, and the purposes of reducing deformation of different positions of the inner wall of the cylinder and optimizing vibration in the working process of the compressor are achieved.

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 discloses a self-rotating cleaning nozzle for cleaning carbon deposits in an air cylinder and a piston ring of a fuel engine, and belongs to the field of engine carbon deposit cleaning. One end of the pulse rotary spraying assembly is connected with an electromagnetic valve seat, and the other end of the pulse rotary cleaning assembly can be directly installed on a spark plug hole to be connected with a combustion chamber, so that a hollow gas conveying cavity is formed. When the piston is located at the top dead center of the air inlet stroke, compressed air is injected into the air cylinder to push the piston to do work, and therefore the engine works continuously. The engine cleaning device has the beneficial effects that an engine is cleaned in the moving process, residues are discharged from the air inlet cavity channel, and the residues cannot cause secondary pollution to the space of a combustion chamber and three-way catalysis; compressed air of the sector pushes the spraying nozzle to rotate and spray out along the center shaft, 360-degree surrounding type cleaning can be conducted on the space of the combustion chamber, and no cleaning blind area is left.

The invention discloses a hydraulic oil dissolved air ultra-vacuum separation device and a separation method thereof, and belongs to the technical field of hydraulic system oil purification. Comprising the steps that oil injection is conducted, an oil pump conveys crude oil from a negative-pressure crude oil tank into a separation oil cylinder, and by switching a first electromagnetic valve, oil inlet and oil discharge of a left cylinder and a right cylinder of the separation oil cylinder or oil inlet and oil discharge of the right cylinder and the left cylinder are achieved; after the separation oil cylinder is filled with the oil liquid, the first electromagnetic valve is closed, the oil charging and discharging pipeline is cut off, then the second electromagnetic valve is opened, and the air exhaust pipeline is communicated; measuring the gas content, injecting a small amount of separated hydraulic oil into the piston type oil gas content measurer, discharging the separated hydraulic oil to a negative pressure isolation oil tank, switching a first electromagnetic valve, switching on a third electromagnetic valve, and starting an oil pump; and after crude oil is injected into the right cylinder of the separation oil cylinder, oil in the left cylinder of the separation oil cylinder is discharged into the negative pressure isolation oil tank through the isolation piston ring. The method is simple to operate; discharge of extracted air can be achieved, and the air is prevented from flowing back into oil.

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.

The invention discloses an intelligent control valve with a self-adaptive sealing structure, and relates to the technical field of valves, the intelligent control valve comprises a valve main body, a self-adaptive sealing mechanism is arranged in the valve main body, a control box matched with the self-adaptive sealing mechanism is arranged on the valve main body, and the valve main body comprises a valve body, a valve rod and a gate plate; a valve seat groove in sliding fit with the gate plate is formed in the valve body, the self-adaptive sealing mechanisms comprise sealing bottom rings, sealing side rings, piston rings and sealing gaskets and are installed on the left side and the right side of the valve seat groove, and the control box comprises a box body, a controller, a pressure regulating pipe and a motor and is installed at the lower end of the valve body. The valve has the advantages of automatically compensating sealing abrasion, monitoring the sealing state in real time and intelligently regulating and controlling, and the problems that a traditional valve is poor in sealing performance, high in maintenance cost and lack of real-time monitoring are solved.

The invention discloses a PDC drill bit capable of adapting to geology, and relates to the technical field of drill bits. The drill bit comprises a threaded mounting block, the top of the threaded mounting block is fixedly connected with a mounting column, the top of the mounting column is rotatably connected with a drill bit body, the top of the drill bit body is fixedly connected with blades, the bottom of the drill bit body is provided with an output shaft groove, and the top of the drill bit body is provided with an adaptive adjusting mechanism. And the adaptive adjusting mechanism comprises a bin body, an oil cavity, a communicating path and a bit leg, the bin body is formed in the mounting column, and the oil cavity is formed in the top of the drill bit body. Through the arrangement of the adaptive adjusting mechanism, when the drill bit body is used for drilling work, the micro motor can be started to drive the threaded rod to rotate according to different geologies, and at the moment, the height of the roller bit body can be adjusted through cooperation of the lifting column, the piston ring, the oil cavity, the piston rod and other assemblies so as to adapt to drilling work of different geologies.

The invention provides an intelligent cleaning control method and system for an engine piston ring, and the method comprises the steps: building a dynamic cleaning path through obtaining the residue phase change gradient, the laser beam incident angle, the roughness and the oxide layer thickness data of a laser thermodynamic action region on the surface of the piston ring; in the cleaning process, based on oxide layer thickness distribution, a deep learning model is used for generating target scanning frequency offset in real time, and laser power density and focusing depth parameters are further optimized. And by dynamically adjusting laser energy distribution, precise removal of residues is achieved, and meanwhile a piston ring base material is protected. The cleaning precision of the engine piston ring is improved.

The invention belongs to the technical field of tensile experiment devices, and particularly relates to a metal rod tensile experiment device which comprises a rack, a supporting table and a tensile assembly, the supporting table and the tensile assembly are installed on the rack, and a fixing assembly is arranged on the surface of the supporting table. By arranging the stretching assembly, when the sliding block ascends, a nylon rope can pull a piston ring to extrude air in a second empty bin to enter a first empty bin through a groove, so that a supporting rod is pushed to slide upwards, and an upward thrust is applied to the sliding block; according to the high-precision lead screw, the situation that the precision of the high-precision lead screw is reduced due to the fact that a threaded groove of the high-precision lead screw is damaged by downward force applied to the surface of the sliding block through a cross beam by a metal rod can be effectively prevented; and the connecting plate is lifted upwards, the connecting rod is pushed to be jacked upwards, and limiting on the groove is relieved, so that the high-precision lead screw is prevented from continuously driving the sliding block to slide downwards.

The invention discloses a novel plug-in type glass fiber reinforced plastic air duct, and relates to the technical field of glass fiber reinforced plastic air ducts. The novel plug-in type glass fiber reinforced plastic air duct comprises a duct body, a plug-in section is arranged at the left end of the duct body in a sealing and sliding mode through a piston ring, a clamping ring is fixed to the left end of the plug-in section, and a check ring is fixed to the inner wall of the duct body; the sealing adjusting assembly is mounted on the inner wall of the socket section through two sliding grooves; and the auxiliary dismounting assembly is arranged between the mounting frame and the sealing adjusting assembly. The sealing ring tightly attached to the outer wall of the inserting section is arranged on the inner wall of the socket section, so that the sealing performance of the inserting structure is improved; the sealing adjusting assembly is arranged, the sealing ring is opened in the inserting process of the inserting section, and the friction resistance during inserting is reduced; by arranging the inserting section capable of being adjusted in a sliding mode and the auxiliary disassembling assembly, the inserting section can be slidably contained in the barrel body during disassembling, the two ends of the middle-section glass fiber reinforced plastic air barrel and the other glass fiber reinforced plastic air barrel are not partially overlapped, and therefore the middle-section glass fiber reinforced plastic air barrel can be rapidly separated from the air barrels at the two ends, and the maintenance and replacement efficiency is improved.

The invention relates to the technical field of medical instruments, in particular to an anti-blocking drainage tube device with a spiral groove, which comprises a tube body, a liquid suction port and a control button, the buffer cleaning mechanism comprises a buffer opening, a connecting column, a movable ring and an expansion sleeve; the dredging mechanism comprises a spiral groove, a piston ring and a driving rod, the driving rod and the piston ring move synchronously, and the stroke of the driving rod is increased along with increase of the pressure intensity in the expansion sleeve; the piston ring is driven by the driving rod to move and rotate to clean and block the pipe body, after the pipe body is blocked, the expansion sleeve deforms outwards, so that the moving ring descends, the stroke of the driving rod is increased, the whole pipe body is dredged, the dredging and anti-blocking functions are achieved while buffering and positioning are achieved, and auxiliary flushing and cleaning are achieved through the auxiliary pipe; meanwhile, the device can be used as a standby pipe to assist in removing fester during dredging, one-way communication of multiple media such as gas and liquid is achieved through the sealing ball, sensitivity is higher, and the fester is prevented from being mixed and flowing back or cleaning liquid and gas are prevented from entering an affected part.

The present invention relates to the technical field of soil measurement, and in particular to a soil measurement device, comprising a measurement body. A measurement member is provided on the measurement body; the measurement member comprises an extension block; an annular groove is formed in the lower end face of the extension block; a piston ring is slidably connected into the annular groove; a protection cylinder is connected to the lower end of the piston ring; an opening is formed in the lower end face of the protection cylinder; an opening door is provided at the opening; a first moving member is connected to the upper end face of the piston ring by means of a moving rod; the first moving member is used for controlling the piston ring to move up and down in the annular groove; a communicating cylinder communicated with the bottom of the annular groove is provided on the axis of the annular groove; a piston disc is slidably connected into the communicating cylinder; and a probe is connected to the lower end of the piston disc. The probe provided by the present invention facilitates the measurement of soil, and the probability of the probe being damaged by a hard object in the soil is reduced.

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 belongs to the technical field of glass fiber production, and particularly relates to a novel multi-drawing wire drawing machine head with a modular structure. The machine head comprises a machine head main shaft, an upper wire ring, a pull rod seat, a broken bridge type expansion sheet and a plurality of sections of sectional type aluminum rotary drums, expansion piece telescopic mechanisms are arranged between the upper wire ring and the sectional type aluminum rotary drum, between the sectional type aluminum rotary drum and the pull rod base and between every two adjacent sections of sectional type aluminum rotary drums. The expansion piece telescopic mechanism comprises a piston ring, a slope sliding block ring, a connecting rod sliding block, a connecting rod, a sliding block ring top spring, a sliding block tension spring and an expansion piece tension spring. According to the novel multi-split wire drawing machine head with the modular structure, the technical problems that the machining difficulty of an ultra-long aluminum rotary drum and an ultra-long expansion sheet is large, the machining quality cannot be guaranteed, and disassembly and assembly are difficult during assembly and maintenance are solved; and meanwhile, the control precision and the expansion piece stretching efficiency are improved, and the power consumption of the wire drawing machine is reduced.

In order to enable improvement with respect to recycling performance, achieve further reduction in weight, and improve environmental performance, a cylinder liner (30) according to the present disclosure has a structure in which, out of an inner face (21i) of a cylinder (21) in a reciprocating engine, the cylinder liner is provided in only a partial region over which a piston ring (50) fit onto a piston (40) that performs reciprocal motion in the cylinder (21) slides, and a liner entire length L along an axial direction of the cylinder (21) is smaller than an inner diameter B of the cylinder, and recessed and protruding forms are formed on one lower end portion (30d) that is an end portion toward a bottom dead center side of the piston ring (50) in the axial direction.

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.

The invention discloses an automatic feeding and discharging piston ring opening milling machine, and particularly relates to the technical field of piston ring machining, the automatic feeding and discharging piston ring opening milling machine comprises a base, a rotating disc is arranged at the front part of the base, a plurality of chucks which are distributed in an annular array by taking a rotating shaft of the rotating disc as a center are rotationally connected to the rotating disc, and an extension cylinder is clamped on each chuck; a plurality of supporting frames are distributed on the peripheral side of each extending cylinder in an annular array mode, a T-shaped limiting rod is arranged on the outer side of each supporting frame, clamping jaws are arranged at the two ends of the transverse portion of each limiting rod respectively, the middles of the clamping jaws are rotationally connected to the limiting rods, and elastic mechanisms for driving the clamping jaws to be opened and closed are arranged on the rear portions of the clamping jaws. Batch feeding and discharging of workpieces can be continuously conducted, the requirement for large-scale opening milling production is met, and the phenomenon that the workpieces are stressed during machining and move can be avoided.

The utility model relates to the technical field of engine detection, and discloses an engine air leakage detection device comprising a support frame; the nitrogen supply part is arranged on the support frame and is connected with any one of a plurality of cylinders of the tested engine; the first gas detection part is used for detecting the gas leakage amount of a cylinder gasket between the detected cylinder and the adjacent cylinder; the second gas detection component is used for detecting the gas leakage amount of the exhaust valve; the third gas detection component is used for detecting the gas leakage amount of the intake valve; the fourth gas detection part is connected with an oil filler cap of the detected engine and is used for detecting the gas leakage rate of the piston ring; and the fifth gas detection part is connected with the cooling liquid degassing pipe and is used for detecting the gas leakage amount of the detected air cylinder leaking gas to the cooling liquid channel of the detected engine through the air cylinder gasket. The detection device can perform leakage test on a plurality of parts at the same time, and the integration level is high.

The utility model discloses an inner cooling oil chamber, oil cooling piston and engine, including: inner cooling oil chamber body, including oil chamber body lower part and oil chamber body upper part, oil chamber body upper part at least includes first vortex area and second vortex area, first vortex area is closer to piston center than second vortex area, and the first vortex area is closer to piston center than second vortex area. The second vortex region is closer to the piston ring groove than the first vortex region. Engine oil is sprayed into the oil inlet channel through an engine oil pump and enters the inner cooling oil cavity body through the oil inlet channel. Along with rapid and high-frequency up-and-down movement of the piston, engine oil continuously collides with the upper wall face and the lower wall face of the inner cooling oil cavity body under the action of inertia force, part of the engine oil impacts the first vortex area to form a first vortex, and part of the engine oil impacts the second vortex area to form a second vortex. The contact area of engine oil and the inner cooling oil cavity body is increased, the flowing speed of the engine oil in the vortex area is higher, a better cooling effect is generated, the temperature of a piston can be more effectively reduced, and the phenomenon that the engine oil in the inner cooling oil cavity is coked is reduced.

The invention discloses a withstand voltage tester with a protection function, and belongs to the technical field of withstand voltage testers. When the withstand voltage tester leaks electricity, after an electromagnet is powered off, no magnetic force is generated between a magnetic attraction block and the electromagnet, and the elastic support of a second spring can drive a pull plate to move; the pull plate drives the clamping block to horizontally move and is separated from the clamping groove in the electroprobe connecting seat, the electroprobe connecting seat is in a free moving state in the terminal sleeve, and then the first spring drives the piston ring to move in the cavity of the fixing ring through the elastic support of the first spring in the fixing ring; the piston ring drives the pressing ring to move outwards and extrudes the connecting plug on the electroprobe connecting seat, the connecting plug can be separated from the power connection terminal and pop out of the terminal sleeve after being pushed, the purpose of rapidly separating the power connection terminal from the connecting plug is achieved, the connection state between the electroprobe assembly and the tester main body can be cut off in time, and the testing efficiency is improved. Threatening of electric leakage to personal safety is prevented, and the use safety of the withstand voltage tester is improved.

The invention relates to fishing supplies, in particular to a buoy with adjustable buoyancy. At present, when facing lead weights, fishhooks and baits with different weights, fishing buoys cannot float or float too much sometimes, and whether fishes are fished or not is not attractive. The invention aims to provide the buoyancy-adjustable buoy which is relatively large in buoyancy adjustment range and does not need to shear a lead sheath during buoy adjustment. According to the technical scheme, the float comprises a float tail, a float body, a float foot and the like. A cylinder, a piston, a piston ring and the like are arranged in the float body, the piston is connected with the float tail, and a through hole is formed from the float body to the float tail through the cylinder, the piston and the like. The volume of the air cylinder can be adjusted by pressing or pulling the float tail, and scale numbers are marked on the float tail. Two ends of the cylinder in the float body are filled with light materials. A sealing ferrule is arranged at the contact position of the float tail and the float body to prevent water from entering the cylinder. According to the floating buoy with the adjustable buoyancy, the battery bin, the luminescent lamp and the like are arranged on the buoy tail.

The invention discloses a volume type hydrogen compressor cylinder body structure and a hydrogen compressor system, and belongs to the technical field of compressors, the compressor system comprises the cylinder body structure, the cylinder body structure comprises a cylinder body, piston assemblies and a piston rod, and the piston assemblies comprise the first piston assembly and the second piston assembly; each of the first piston assembly and the second piston assembly comprises a piston ring and a guide ring; an air guide hole is formed in the piston rod, an annular groove is formed between the first piston assembly and the second piston assembly, and one end of the air guide hole communicates with the annular groove; the pressure sampling device further comprises a pressure sampling cylinder, a cavity is formed in the pressure sampling cylinder, and when the piston assembly is in the gas compression stroke, the other end of the gas guide hole is communicated with the cavity. And the pressure sensor is used for measuring the pressure in the cavity. According to the structural design provided by the scheme, online monitoring of the sealing condition of the piston assembly and the air cylinder wall can be achieved, and compared with technologies based on vibration monitoring, sound wave monitoring and the like, adverse effects of the data extraction and analysis process on the monitoring result can be avoided.

A piston ring seal arrangement of a gas turbine engine includes a piston ring having a circumferentially split ring configuration having a first axially-facing side and a second axially-facing side opposite the first axially facing side. The piston ring includes a first circumferential end circumferentially overlapping a second circumferential end. The piston ring is installed into a groove in a mating component. The first circumferential end and the second circumferential end define a plurality of edges on the first axially-facing side and the second axially-facing side. The first axially-facing side includes fewer edges than the second axially-facing side, and an operating pressure acting on the piston ring is greater at the second axially-facing side than at the first axially-facing side.

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.

An axle assembly having a clutch collar. The axle assembly includes a shaft, a piston, a bearing assembly, and the clutch collar. The piston encircles the clutch collar. The bearing assembly extends from the piston to the clutch collar and facilitates rotation of the clutch collar with respect to the piston.

The invention belongs to the technical field of positive displacement vacuum pumps, and particularly relates to a sealing mechanism of a vacuum pump, which comprises a labyrinth seal and a piston ring seal, the left and right sides of the labyrinth seal and the piston ring seal in the axial direction are respectively provided with an oil cavity and a pump cavity; the radial inner and outer sides of the labyrinth seal and the piston ring seal are respectively provided with a rotor shaft in a pump cavity and an oil tank side sealing plate in an oil cavity; the labyrinth seal comprises a labyrinth seal moving ring and a labyrinth seal static ring, the labyrinth seal moving ring is arranged on the rotor shaft in a sleeving mode and is in linkage with the rotor shaft, and the labyrinth seal static ring is arranged on the labyrinth seal moving ring in a sleeving mode and is fixedly connected with the oil tank side sealing plate; the piston ring seal comprises at least one piston ring; a piston groove is formed in the rotor shaft; or the rotor shaft is sleeved with a piston shaft sleeve, and a piston groove is formed in the outer surface of the piston shaft sleeve; the piston ring is accommodated in the piston groove. Non-contact sealing is completely adopted, the problems of friction heat generation, friction abrasion and the like of a contact lip seal are avoided, the use power consumption of the pump body is reduced, and the quality inspection cost and the manufacturing cost are reduced.

To provide a piston of a compressor which enables improvement of strength compared to conventional arts.SOLUTION: A piston of the invention includes: a resin formation part 36 (a resin piston body) which reciprocates in a cylinder in the axial direction of the cylinder; and a metallic insert component which is embedded in the resin formation part 36 and connected to a connecting rod. The resin formation part 36 has a peripheral groove 33b, in which a piston ring is fitted, on a spherical-shaped circumferential wall surface. The peripheral groove 33b has an inclination different from that of the upper surface of the resin formation part 36 when the resin formation part 36 is viewed from a side surface and has a first groove wall 33b1 and a second groove wall 33b2 facing in a groove width direction in a written order from the piston head 33c side of the resin formation part 36. A gate resin cutting part 33d in the resin formation part 36 is located closer to the connecting rod side than the first groove wall 33b1 of the peripheral groove 33b.SELECTED DRAWING: Figure 4

The invention relates to turning and grinding composite equipment for machining an outer circle and an annular groove of a steel piston and a using method of the turning and grinding composite equipment, and belongs to the technical field of piston machining equipment. The equipment comprises a base, a stand column, a left planker, a right planker, a left workbench, a right workbench, a tool turret, a static pressure electric spindle and a rotating spindle, the stand column is arranged on one side of the base, and the left planker and the right planker are horizontally arranged on the two sides of the stand column respectively through servo lead screw systems; the left carriage and the right carriage are vertically provided with a left workbench and a right workbench through servo lead screw systems respectively, the left workbench is provided with a tool turret, the tool turret is provided with a machining tool, the right workbench is provided with a static pressure electric spindle, the lower end of the static pressure electric spindle is provided with a grinding wheel, and the other side of the base is provided with a rotating spindle. The outer circle of the piston is machined through turning, turning is replaced by grinding when the piston ring groove is machined, the machining precision of the piston ring groove is improved, the service life of the piston ring groove is prolonged, the structure is compact, operation is convenient, and the machining efficiency is high.