CN108425826B - Novel cylinder piston assembly and oil-free lubrication method - Google Patents
Novel cylinder piston assembly and oil-free lubrication method Download PDFInfo
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- CN108425826B CN108425826B CN201810073025.2A CN201810073025A CN108425826B CN 108425826 B CN108425826 B CN 108425826B CN 201810073025 A CN201810073025 A CN 201810073025A CN 108425826 B CN108425826 B CN 108425826B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0016—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons with valve arranged in the piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0044—Pulsation and noise damping means with vibration damping supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
- F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/42—Pumps with cylinders or pistons
Abstract
According to the novel cylinder piston assembly and the oil-free lubrication method related by the invention, the novel cylinder piston assembly comprises a cylinder assembly and a piston assembly, the cylinder assembly comprises a cylinder, a cylinder cover, an exhaust valve and a conical spring, the piston assembly comprises a piston, a gas bearing and an air suction valve, the gas bearing comprises a gas bearing seat with an open straight cylinder with a bottom surface, a hollow cylinder is arranged in the center of the piston, two annular gas grooves which are parallel and vertical to the center line of the gas bearing seat are respectively arranged at two ends of the outer side wall of the gas bearing seat, four radial throttle holes which are communicated with an air storage cavity are symmetrically arranged on the center line of the bottom surface of the annular gas groove, a throttle slit communicated with the throttle holes is correspondingly arranged at the center position of the annular gas groove, a working medium uniformly flows into a gap between the gas bearing and the cylinder from the throttle slit to form a gas film, and the gas film, thereby realizing oil-free lubrication of the compressor.
Description
Technical Field
The invention belongs to the field of machinery, and particularly relates to a novel cylinder piston assembly and an oil-free lubrication method.
Background
In the traditional reciprocating compressor, a motor drives a crankshaft to rotate, a piston is driven by a connecting rod to reciprocate up and down in a cylinder, and the processes of sucking, compressing and discharging a working medium are completed by matching a suction valve and a discharge valve. The scroll compressor consists of a fixed static disc and a movable disc which is eccentrically convoluted and translationally moved, and the fixed static disc and the movable disc are mutually meshed to form a compressible closed volume and compress a working medium. The rolling rotor compressor is a compressor with closed volume composed of a fixed circular cylinder, a rotor, an exhaust valve, a sliding sheet always clinging to the outer surface of the rotor and end covers at two sides.
As before, the compressor is typically driven by a rotary motor. The crank and connecting rod structure of the reciprocating compressor converting the rotation motion into the reciprocation motion has a large loss. The radial load of the rotary compressor is too high, resulting in increased friction loss. The linear compressor is a compressor driven by a linear synchronous oscillation motor. The linear synchronous oscillation motor can automatically generate high-frequency reciprocating linear motion by utilizing the resonance principle of electromagnetic force and spring force and can directly push the rotor to move. The linear compressor has no crank mechanism for converting rotary motion into reciprocating motion, so that the linear compressor has the advantages of low loss, high efficiency, compact structure and small volume.
Chinese patent "an oil supply method and an oil supply mechanism of a linear compressor" (publication No. CN103711676A, published japanese patent No. 2014.04.09) discloses a linear compressor in which a casing stores lubricating oil, and an oil supply device thereof includes an oil cylinder and an oil supply piston provided in the oil cylinder. One of the two is fixedly connected with the shell, the other is linked with the motor body, and oil is supplied to the oil-requiring part of the compressor by utilizing the relative motion between the two when the piston moves and the oil supply pipe. Because this linear compressor uses lubricating oil lubrication, in order to guarantee compressor normal operating, so need often to inspect the memory space of lubricating oil, increased work link and work load, this linear compressor can appear lubricating oil after long-time the use moreover and leak, deteriorate and pollute working medium scheduling problem.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a novel cylinder piston assembly and an oil-free lubrication method.
The invention provides a novel cylinder piston component, which is characterized by comprising a cylinder component and a piston component, wherein the cylinder component comprises a cylinder, a cylinder cover, a vent valve and a conical spring, the cylinder cover is fixedly connected with a flange plate end of the cylinder, the vent valve is connected on the end surface of an inner through hole of a cylinder body of the cylinder through the conical spring in the cylinder cover, the piston component comprises a piston, a piston support connected with the piston, a gas bearing and a suction valve, the gas bearing comprises a gas bearing seat, the gas bearing seat is an open straight cylinder with a bottom surface, the suction valve is arranged in the center of the outer bottom surface of the open straight cylinder, the center of the piston is provided with a hollow cylinder, the top surface of the hollow cylinder is communicated with the inner bottom surface of the open straight cylinder of the gas bearing seat, the piston is fixedly connected with the gas bearing seat, a space between the gas bearing seat and the gas bearing seat is provided with, four radial throttle holes communicated with the air storage cavity are symmetrically arranged on the central line of the bottom surface of the annular air groove, an air bearing air inlet hole is formed in the bottom surface of the air bearing seat, a one-way valve is arranged in the air bearing air inlet hole, a plurality of lubricating rings made of self-lubricating materials are sleeved on the outer side wall of the air bearing seat, a throttling slit communicated with the throttle holes is correspondingly arranged in the central position of the annular air groove, the other end of the air cylinder is arranged in a hollow cylinder of the piston, and the air cylinder, the exhaust valve, the piston and the suction valve form a compression cavity.
In the novel cylinder piston assembly provided by the invention, the novel cylinder piston assembly can also have the following characteristics: wherein, the contact surface of the gas bearing seat and the piston adopts brazing sealing.
In addition, in the novel cylinder piston assembly provided by the invention, the novel cylinder piston assembly also can have the following characteristics: wherein the self-lubricating material is polyimide.
In addition, in the novel cylinder piston assembly provided by the invention, the novel cylinder piston assembly also can have the following characteristics: wherein, the exhaust valve adopts a disk exhaust valve.
The invention provides an oil-free lubrication method for a compressor comprising the novel cylinder piston assembly, which is characterized by comprising the following steps:
step 1, compressing the working medium sucked into a compression cavity by a piston;
step 2, when the pressure in the compression cavity reaches the opening pressure of the one-way valve; a small amount of high-pressure working medium enters the air storage cavity through the air bearing air inlet, and if the pressure in the compression cavity is lower than the opening pressure of the one-way valve, the one-way valve is closed to prevent the working medium in the air storage cavity from flowing back to the compression cavity;
step 3, the working medium in the air storage cavity flows into the annular air groove through the throttling hole;
step 4, the throttling hole generates a certain throttling effect on the working medium, and the throttled working medium is uniformly diffused in the annular gas groove;
step 5, performing secondary throttling on the working medium through a throttling slit on the lubricating ring;
and 6, uniformly flowing the throttled working medium into a gap between the gas bearing and the cylinder from the throttling slit to form a gas film, and enabling the gas film to support the piston assembly to do linear reciprocating motion in the cylinder, so that oil-free lubrication of the compressor is realized.
Action and Effect of the invention
The invention relates to a novel cylinder piston assembly, which comprises a cylinder assembly and a piston assembly, wherein the cylinder assembly comprises a cylinder, the piston assembly comprises a piston, a permanent magnet arranged on the piston and a piston support connected with a plate spring, a linear motor is fixed by a bolt group connecting the plate spring support and the cylinder and sleeved on the permanent magnet, a gap is formed between the permanent magnet and the linear motor, one end of the piston assembly is fixed on the plate spring support through the plate spring, the other end of the piston assembly is arranged between the linear motor and the cylinder assembly, a cylindrical spring is arranged between the piston assembly and the cylinder assembly, and the permanent magnet drives the piston to do linear reciprocating motion in the cylinder under the action of electromagnetic force of the linear motor so as to compress a refrigeration medium.
The linear compressor without oil lubrication adopts the linear synchronous oscillating motor, and the linear synchronous oscillating motor can automatically generate high-frequency reciprocating linear motion by utilizing the resonance principle of electromagnetic force and spring force and can directly push the rotor to move. The linear compressor has no crank mechanism for converting rotary motion into reciprocating motion, so that the linear compressor has the advantages of low loss, high efficiency, compact structure and small volume.
The oil-free lubrication linear compressor adopts the plate spring with larger radial rigidity to support the compressor piston and is used for keeping the clearance seal between the piston and the cylinder in the motion process; the axial rigidity required by the piston movement can be provided, and the resonant frequency of the piston movement can be controlled. Linear compressor gap sealing may be achieved using plate spring support technology.
The linear compressor of the invention uses the plate spring and the cylindrical spring to support the compressor piston assembly in a combined manner, thereby greatly improving the axial rigidity and the radial rigidity of the linear compressor.
Drawings
FIG. 1 is a schematic sectional view showing an internal structure of an oil-free linear compressor according to an embodiment of the present invention; and
fig. 2 is a schematic sectional view showing a piston assembly in an oil-free linear compressor according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, the original features, the achieved objects and the effects of the present invention easily understood, the following embodiments are specifically described with reference to the accompanying drawings.
Fig. 1 is a schematic sectional view showing an internal structure of an oil-free linear compressor according to an embodiment of the present invention.
As shown in fig. 1, the oil-free linear compressor 100 has a linear motor 10, a compression unit 20, a housing unit 30, and a plurality of supporting springs 40.
The linear motor 10 includes a bobbin 11, an exciting coil 12, a left outer stator 13, and a right outer stator 14.
The bobbin 11 is used to accommodate an enamel wire.
The excitation coil 12 is made by winding an enameled wire around the bobbin 11 by a winding machine.
The left outer stator 13 and the right outer stator 14 are clamped on both sides of the exciting coil 12 to form the linear motor 10, and the linear motor 10 is cylindrical.
The compression unit 20 includes a cylinder assembly 21, a plate spring assembly 22, a plurality of bolt sets 23, a piston assembly 24, a plurality of cylinder springs 25, and a compression chamber 26.
The cylinder assembly 21 includes a cylinder 211, an inner stator 212, a cylinder head 213, a plurality of cylinder head fastening screws 214, an exhaust valve 215, a conical spring 216, and an exhaust pipe 217.
The cylinder 211 is the ring flange shape, and one end is the flange, and the other end is the disc and evenly is provided with 8 through-holes along disc circumference, and the cylinder 211 has cylindrical interior through-hole.
The inner stator 212 is cylindrical, and is sleeved outside the flange of the cylinder 211 and fixedly connected with the cylinder 211.
The cylinder head 213 is in the shape of a disk, a cavity is provided in the middle of the disk, and a vent hole communicating with the cavity in the middle of the disk is further provided in the cylinder head 213.
8 cylinder head fastening screws 214 fixedly attach the cylinder head 213 to the end face of the disc end of the cylinder 211.
The exhaust valve 215 is a disk-shaped exhaust valve.
The conical spring 216 is used to connect the exhaust valve 215 in the cavity of the cylinder head and support the exhaust valve 215 to be connected to the end surface of the through hole in the cylinder body of the cylinder 211.
One end of the exhaust pipe 217 is fixedly and hermetically connected to the cylinder head 213 through an exhaust pipe hole and communicates with the cavity of the cylinder head 213, and the other end is open to the outside of the housing unit 30.
The leaf spring assembly 22 includes at least one leaf spring 221, a plurality of washers 222, a leaf spring bracket 223, a plurality of leaf spring fastening screws 224, and a nut 225.
The plate spring 221 has a large radial stiffness and a large axial stiffness, and the plate spring 221 is in a shape of a disk, and a through hole is formed in the middle of the plate spring, and the number of the through hole is at least one, and in an embodiment, is 3.
The 2 washers 222 are respectively disposed at intervals between the 3 plate springs 221.
The plate spring support 223 is hollow cylindrical, one end of the plate spring support is provided with a boss for mounting the plate spring 221, the boss can prevent the plate spring 221 from sliding along the axial direction, 4 outer threaded holes are evenly formed in the boss along the circumferential direction, and 8 through holes are evenly formed in the end face of the other end in the circumferential direction.
The 4 leaf spring fastening screws 224 fix the outer edges of the 3 leaf springs 221 to the leaf spring support 223.
The number of the bolt sets 23 is 8, and the bolt sets are respectively correspondingly installed in the 8 through holes of the plate spring support 223 and the cylinder 211, and the linear motor 10 is clamped between the plate spring support 223 and the cylinder 211 and is fixed by the 8 bolt sets 23 connecting the plate spring support 223 and the cylinder 211.
Fig. 2 is a schematic sectional view showing a piston assembly in an oil-free linear compressor according to an embodiment of the present invention.
As shown in fig. 2, the piston assembly 24 includes a piston 241, a permanent magnet 242, a gas bearing 243, a suction valve 244, a plurality of suction valve fastening screws 245, a piston holder 246, and a plurality of piston fastening screws 247.
The piston 241 has a cylindrical shape with a bottom surface, a hollow cylinder is further provided at the center of the bottom surface, the hollow channel serves as an air inlet channel for a refrigerant, and the piston 241 is made of metal, in an embodiment, aluminum alloy.
The permanent magnet 242 has a cylindrical shape, and the permanent magnet 242 is fitted around the outside of the piston 241 and is fixedly bonded to the piston 241.
The gas bearing 243 includes a gas bearing seat 243a, a gas storage chamber 243b, an annular gas groove 243c, a throttle hole 243d, a lubricating ring 243e, a throttle slit 243f, a gas bearing intake hole 243g, and a check valve 243 h.
The gas bearing block 243a is an open straight cylinder with a bottom surface, the open straight cylinder is sleeved on the outer side of the hollow cylinder of the piston 241 and is fixedly connected with the piston 241, and a space formed between the open straight cylinder and the piston 241 is a gas storage cavity 243 b; wherein, the top surface of the hollow cylinder is communicated with the bottom surface of the open straight cylinder of the gas bearing seat 243 a; the gas bearing support 243a is made of metal, in the embodiment, aluminum alloy; the contact surface of the gas bearing support 243a and the piston 241 is sealed by brazing.
Two annular air grooves 243c which are parallel and perpendicular to the center line of the gas bearing block 243a are respectively arranged at two ends of the outer side wall of the straight cylinder of the gas bearing block 243 a.
Four radial throttle holes 243d communicating with the air storage chamber 243b are symmetrically provided on the center line of the bottom surface of the annular air groove 243 c.
The outer side wall of the gas bearing seat 243a is also sleeved with 3 lubricating rings 243e made of self-lubricating materials, and the self-lubricating materials are polyimide.
A throttle slit 243f communicating with the throttle hole 243d is correspondingly provided at a central position of the annular air groove 243 c.
The gas bearing intake holes 243g are provided on the bottom surface of the gas bearing housing 243 a.
A check valve 243h is provided in the gas bearing intake hole 243 g.
The suction valve 244 is fixedly coupled to the central through hole of the outer bottom surface of the gas bearing housing 243a by 4 suction valve fastening screws 245.
The piston support 246 is in a flange shape with a flange and is provided with a central through hole, the flange end of the piston support 246 is provided with external threads, and the flange end is uniformly provided with 8 threaded holes along the circumferential direction.
The flange end of the piston holder 246 passes through the center of the plate spring 221 and is fixedly coupled to the plate spring 221 by a nut 225.
The flange end of the piston holder 246 is fixedly connected to the bottom surface of the piston 241 through 8 piston fastening screws 247 and the piston 241, and the central through hole of the piston holder 246 is communicated with the central through hole of the piston 241.
One end of the piston assembly 24 is fixed on the plate spring support through a plate spring, and the other end is arranged between the linear motor 10 and the cylinder assembly 21 and has a gap with the linear motor 10 and the cylinder assembly 21 respectively.
The piston assembly 24 and the cylinder assembly 21 are supported by cylindrical springs 25, and at least four cylindrical springs 25 are uniformly arranged on the inner bottom surface of the piston 241 in the circumferential direction for improving the axial rigidity required when the piston 241 moves, wherein the number of the cylindrical springs 25 is 6 in the embodiment.
The compression chamber 26 is a space formed between the piston 241, the suction valve 244, the cylinder 211, and the discharge valve 215.
The housing unit 30 includes a housing 31, a lower case 32, and an upper case 33.
The housing 31 is fixed in the actual use environment.
The lower housing 32 is fixedly connected to the base 31, and one side of the lower housing 32 is provided with an air inlet 321 and the other side is provided with an exhaust pipe hole.
The upper housing 33 is fixedly and hermetically connected to the lower housing 32.
The linear motor 10 and the compression unit 20 are supported using 4 support springs 40 and are disposed within the housing unit 30.
The support springs 40 connected to the lower case 32 are provided 1 under one end of the plate spring support 223 and under the flange end of the cylinder 211, respectively.
Correspondingly, 1 support spring 40 is also provided above the respective position and is connected to the upper housing 33.
The 4 supporting springs 40 are used to reduce vibration generated when the piston 241 moves and noise generated by vibration of the lower and upper housings 32 and 33.
The operating principle of the oil-free linear compressor 100 is as follows:
the piston 241 generates a resonant motion by the combined action of the acting force of the plate spring 221, the acting force of the cylindrical spring 25 and the electromagnetic force of the linear motor 10, and the permanent magnet drives the piston 241 to make a linear reciprocating motion in the cylinder to compress a refrigerant after being acted by the electromagnetic force of the linear motor. The air inlet mode of the compressor is a forward air inlet mode, working medium enters the interior of the compressor from an air inlet 321, enters the compression cavity 26 through an air inlet channel and an air suction valve 244, enters the exhaust cavity through a disc-shaped exhaust valve 215 after being compressed by a piston 241, and finally is discharged out of the shell through an exhaust pipe 217.
Because the plate spring 221 has larger radial stiffness, no radial deflection can be ensured when the piston 241 axially moves, and the gap between the piston 241 and the cylinder 211 is sealed, so that the piston 241 does not contact with friction to move, and the oil-free lubrication of the compressor is realized; the leaf springs 221 and the cylindrical springs 25 cooperate to provide the axial stiffness required for the compressor, controlling the resonant frequency of the movement of the piston 241. The common support of the two springs greatly improves the axial stiffness and the radial stiffness of the linear compressor, so that the piston 241 can operate reliably during the resonant motion.
The working process of the gas bearing 243 when the piston 241 moves is as follows:
the linear compressor piston 241 compresses the working medium sucked into the compression chamber 26, and when the pressure in the compression chamber 26 reaches the opening pressure of the check valve 243h, a small amount of high-pressure working medium enters the air storage chamber 243b through the gas bearing air inlet hole 243g, and if the pressure in the compression chamber 26 is lower than the opening pressure of the check valve 243h, the check valve 243h is closed to prevent the working medium in the air storage chamber 243b from flowing back into the compression chamber 26. The high-pressure working medium in the air reserving chamber 243b flows into the annular air groove 243c through the throttle hole 243 d. The throttle hole 243d generates a certain throttling effect on the high-pressure working medium, the throttled working medium is uniformly diffused in the annular gas groove 243c, then the working medium is throttled secondarily through the throttle slit 243f on the lubricating ring 243e, the throttled working medium uniformly flows into a gap between the gas bearing 243 and the cylinder 211 through the throttle slit 243f to form a gas film, and the gas film supports the piston assembly 24 to perform linear reciprocating motion in the cylinder 211. The linear compressor 100 uses a gas bearing support technology to realize oil-free lubrication of the compressor, and uses the working medium itself to realize clearance sealing, thereby reducing friction between the gas bearing 243 and the cylinder 211 and reducing noise generated when the piston 241 moves. Effects and effects of the embodiments
The linear compressor of the present embodiment has the suction valve disposed at the top of the hollow piston such that the suction passage and the suction valve are both on the piston, and the working medium is compressed by the piston and discharged from the discharge valve in the same direction as the suction direction, which minimizes both the suction heating loss and the flow resistance loss of the working medium. The exhaust valve is supported by a disc valve and a conical spring and is arranged in the cylinder cover, so that the flow area is larger, the compression loss is reduced, and meanwhile, the compressor is compact in structure, small in size and good in stability.
The linear compressor of the embodiment adopts a gas bearing support technology, and a high-pressure working medium compressed by a piston enters a gas storage cavity of the gas bearing through a check valve arranged on the gas bearing, then enters an annular gas groove through a throttling hole, and finally passes through throttling slits in three sections of self-lubricating materials on the surface of the gas bearing to form a high-pressure gas film between the gas bearing and a cylinder. The high pressure gas film has a large rigidity and prevents the gas bearing from contacting the cylinder. By using the gas bearing supporting technology, oil-free lubrication and gap sealing of the linear compressor can be realized, the friction is small, and the noise is low.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (5)
1. An oil-free linear compressor having a cylinder piston assembly, comprising:
a cylinder component, a piston component, a plurality of cylindrical springs arranged between the piston component and the cylinder component, a shell and a plurality of supporting springs for shock absorption,
wherein the cylinder component comprises a cylinder, a cylinder cover, an exhaust valve and a conical spring, the cylinder cover is fixedly connected with a flange plate end of the cylinder, the exhaust valve is connected on the end surface of an inner through hole of a cylinder body of the cylinder in the cylinder cover through the conical spring,
the piston assembly comprises a piston, a piston bracket connected with the piston, a gas bearing and a suction valve,
one end of the piston assembly is fixed on the plate spring bracket through a plate spring, the other end of the piston assembly is arranged between the linear motor and the air cylinder assembly,
the gas bearing comprises a gas bearing seat which is an open straight cylinder with a bottom surface, the gas suction valve is arranged at the center of the outer bottom surface of the open straight cylinder,
the piston is in a cylinder shape with a bottom surface, the center of the bottom surface of the piston is provided with a hollow cylinder, the top surface of the hollow cylinder is communicated with the inner bottom surface of the open straight cylinder of the gas bearing seat, the hollow channel is used as an air inlet channel of a refrigeration medium,
the cylindrical springs are circumferentially and uniformly arranged on the bottom surface of the piston,
the open straight cylinder is sleeved on the outer side of the hollow cylinder of the piston and is fixedly connected with the piston, the space between the open straight cylinder and the piston is an air storage cavity, the bottom surface of the air bearing seat is provided with an air inlet through hole, a one-way valve is arranged in the air inlet through hole,
two ends of the outer side wall of the gas bearing seat are respectively provided with two parallel annular gas grooves which are vertical to the central line of the gas bearing seat, four radial throttling holes which are communicated with the gas storage cavity are symmetrically arranged on the central line of the bottom surface of the annular gas grooves, the bottom surface of the gas bearing seat is provided with a gas bearing gas inlet hole, a one-way valve is arranged in the gas bearing gas inlet hole,
the outer side wall of the gas bearing seat is also sleeved with a plurality of lubricating rings made of self-lubricating materials, a throttling slit communicated with the throttling hole is correspondingly arranged at the central position of the annular gas groove,
the other end of the cylinder is a flange with a cylindrical inner through hole and is positioned between the gas bearing seat and the inner stator, the cylinder, the exhaust valve, the piston and the suction valve form a compression cavity,
the shell is connected with the plate spring bracket and the cylinder through a plurality of supporting springs,
after the refrigerating medium enters the compressor, the refrigerating medium enters the compression cavity through the air inlet channel and the air suction valve in a forward air inlet mode.
2. An oil-free linear compressor having a cylinder piston assembly as claimed in claim 1, wherein:
wherein, the contact surface of the gas bearing seat and the piston adopts brazing sealing.
3. An oil-free linear compressor having a cylinder piston assembly as claimed in claim 1, wherein:
wherein the self-lubricating material is polyimide.
4. An oil-free linear compressor having a cylinder piston assembly as claimed in claim 1, wherein:
wherein, the exhaust valve adopts a disk-shaped exhaust valve.
5. A method of oil-free lubrication using the oil-free linear compressor having a cylinder piston assembly of any one of claims 1 to 4, comprising the steps of:
step 1, after the refrigeration medium enters the compressor, the refrigeration medium enters the compression cavity through the air inlet channel and the air suction valve in a forward air inlet mode, and the piston compresses the working medium sucked into the compression cavity;
step 2, when the pressure in the compression cavity reaches the opening pressure of the one-way valve; a small amount of high-pressure working medium enters the air storage cavity through the air bearing air inlet hole, and if the pressure in the compression cavity is lower than the opening pressure of the one-way valve, the one-way valve is closed to prevent the working medium in the air storage cavity from flowing back to the compression cavity;
step 3, the working medium in the air storage cavity flows into the annular air groove through the throttling hole;
step 4, the throttling hole generates a certain throttling effect on the working medium, and the throttled working medium is uniformly diffused in the annular gas groove;
step 5, the working medium is throttled for the second time through the throttling slit on the lubricating ring;
and 6, the throttled working medium uniformly flows into a gap between the gas bearing and the cylinder from the throttling slit to form a gas film, and the gas film supports the piston assembly to do linear reciprocating motion in the cylinder, so that oil-free lubrication of the compressor is realized.
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| CN201610578795.3A CN106089632B (en) | 2016-07-21 | 2016-07-21 | A kind of oil-free lubrication Linearkompressor |
| CN201810073025.2A CN108425826B (en) | 2016-07-21 | 2016-07-21 | Novel cylinder piston assembly and oil-free lubrication method |
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| CN201810072662.8A Pending CN108343589A (en) | 2016-07-21 | 2016-07-21 | A kind of novel piston component, compression unit and oil-free lubrication Linearkompressor |
| CN201810073082.0A Active CN108425827B (en) | 2016-07-21 | 2016-07-21 | Compression unit and oil-free lubrication linear compressor |
| CN201610578795.3A Active CN106089632B (en) | 2016-07-21 | 2016-07-21 | A kind of oil-free lubrication Linearkompressor |
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| CN201810072440.6A Active CN108397369B (en) | 2016-07-21 | 2016-07-21 | Oil-free lubrication linear compressor and gas compression method |
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| CN109595136A (en) * | 2018-12-21 | 2019-04-09 | 中国电子科技集团公司第十六研究所 | A kind of linear household air-conditioner compressor |
| CN110701189A (en) * | 2019-09-23 | 2020-01-17 | 浙江大学 | Gas lubrication method adopting axial non-uniform arrangement and application |
| KR102269942B1 (en) * | 2020-01-15 | 2021-06-28 | 엘지전자 주식회사 | Compressor |
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| Publication number | Publication date |
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| CN108343589A (en) | 2018-07-31 |
| CN108397369B (en) | 2020-04-28 |
| CN108425826A (en) | 2018-08-21 |
| CN106089632A (en) | 2016-11-09 |
| CN108425827B (en) | 2020-05-12 |
| CN108425827A (en) | 2018-08-21 |
| CN108397369A (en) | 2018-08-14 |
| CN106089632B (en) | 2018-03-02 |
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