CN-121976936-A - Multistage oil-free linear valved compressor

CN121976936ACN 121976936 ACN121976936 ACN 121976936ACN-121976936-A

Abstract

The embodiment of the application provides a multistage oil-free linear valved compressor, which comprises a compressor device, wherein the compressor device comprises a driving component and a stepped compression mechanism, the stepped compression mechanism comprises a compression piston and a cylinder body, the compression piston is provided with a bulge to form a stepped shape along a first direction, a plurality of sections of cylinders which are different in radius and are communicated with each other along the first direction in the cylinder body form a multistage unequal-diameter cylinder body, the compression piston and the multistage unequal-diameter cylinder body are in clearance fit to form at least two compression cavities with different radiuses, and the driving component is used for driving the compression piston to reciprocate in the compression cavities along the first direction to realize multistage gas compression. The multistage gas compression is realized through the stepped compression mechanism, the problems of pollution, vibration and low efficiency of the traditional compressor in an oil-free environment are solved, and the multistage gas compressor has the advantages of oil-free operation, high-efficiency compression, low vibration and high reliability.

Inventors

YANG CHAOHUI
LI HAIBING
QIAO JIANXIN

Assignees

中科力函（深圳）低温技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260320

Claims (10)

1. A multi-stage oil-free linear valved compressor comprising: A compressor device including a drive assembly and a stepped compression mechanism; The stepped compression mechanism comprises a compression piston and a cylinder body, wherein the compression piston is provided with bulges along a first direction to form a stepped shape, a plurality of sections of cylinders which are different in radius and are mutually communicated along the first direction in the cylinder body form a plurality of sections of unequal-diameter cylinder bodies, and the compression piston and the plurality of sections of unequal-diameter cylinder bodies are in clearance fit to form at least two compression cavities with different radiuses; And the driving assembly is used for driving the compression piston to reciprocate in the compression cavity along a first direction so as to realize multistage gas compression.
2. The multi-stage oil-free linear valved compressor of claim 1, wherein the multi-stage unequal diameter cylinder block comprises at least three-stage unequal diameter cylinder blocks of a first cylinder, a second cylinder, and a third cylinder sequentially arranged along a first direction; The cylinders of the first cylinder, the second cylinder and the third cylinder are communicated with each other to form a gas path; the radii of the cylinder of the first cylinder, the cylinder of the second cylinder and the cylinder of the third cylinder are different, so that two compression cavities with different radii are formed.
3. The multi-stage oil-free linear valved compressor of claim 2, further comprising an intermediate base, wherein the compressor device is provided with two, first and second compressor units, respectively, symmetrically disposed in the intermediate base along a first direction; The gas circuit of the first compressor unit and the gas circuit of the second compressor unit are connected in series to realize multistage high-pressure ratio compression output; Or, the gas circuit of the first compressor unit and the gas circuit of the second compressor unit are connected in parallel to realize multistage high-flow compression output.
4. A multi-stage oil-free linear valved compressor according to claim 3, wherein the drive assembly comprises a drive source and a flexible rod; The driving source comprises a shell, a motor stator, a motor rotor and a spring group, wherein the motor stator is embedded in the shell, the motor rotor is movably arranged in the motor stator, and the motor rotor is connected with the compression piston through the flexible rod and is used for driving the compression piston to reciprocate in the compression cavity along a first direction; The spring group is hard-connected with the motor rotor.
5. The multi-stage oil-free linear valved compressor of claim 4, wherein the motor mover of the first compressor unit and the motor mover of the second compressor unit form a reciprocating structure; the motor driving device comprises a compressor device, a driving source of the compressor device, a slave motor, a controller and motor movers, wherein the driving source of the compressor device on one side is used as a master motor, the driving source of the compressor device on the other side is used as a slave motor, and the controller controls the slave motor to synchronously run along with the master motor so that the motor movers on two sides do reverse synchronous reciprocating motion.
6. The multi-stage oil-free linear valved compressor of claim 4, wherein the driving assembly comprises a wall cylinder and an end plate, the wall cylinder is fixedly sleeved in an inner hole of the motor stator, the periphery of the wall cylinder is in sealing connection with the shell, two ends of the wall cylinder are respectively in sealing connection with the end plate, and the motor rotor movably penetrates through the interior of the wall cylinder through a first static pressure air bearing.
7. The multi-stage oil-free linear valved compressor of any one of claims 1-6, wherein the compression piston is movably arranged through the multi-stage unequal diameter cylinder block by a second static pressure air bearing, and a preset gap is reserved between the outer peripheral surface of the compression piston and the inner hole surface of the multi-stage unequal diameter cylinder block to form an air floatation cavity of the static pressure air bearing; The two ends of the compression piston are provided with throttlers, the throttlers are communicated with the air floatation cavity, and high-pressure gas enters the air floatation cavity through the throttlers to form a gas film for radially supporting the compression piston; The compression piston is provided with a first one-way valve on one side close to the middle base body, and a second one-way valve is arranged between an air inlet of the first one-way valve and an air inlet of the multi-section unequal-diameter cylinder block.
8. The multi-stage oil-free linear valved compressor of any one of claims 1-6, wherein valve blocks are provided at both ends of the second cylinder in the first direction; The air valve group comprises a valve plate, and valve plates are arranged at two ends of the valve plate along the first direction; the upper half part of the valve plate is a sealing plane, and a plurality of air passing holes are formed in the sealing plane; the lower half part of the valve plate is of a concave structure, and an inclined plane used for limiting the movement of the valve plate is arranged on the concave structure; The sealing plane of one valve plate on the same side is arranged opposite to the concave structure of the other valve plate; The diameter of the inner hole of the valve group is larger than that of the compression piston.
9. The multi-stage oil-free linear valved compressor of any one of claims 2-6, wherein the compressor apparatus comprises an interstage heat exchange unit sleeved outside the multi-stage unequal diameter cylinder block; The interstage heat exchange unit comprises a heat exchanger shell, an inner fin is arranged on the inner side of the heat exchanger shell, an outer fin is arranged on the outer side of the heat exchanger shell, and the inner fin is attached to the outer peripheral surface of the multi-section unequal-diameter cylinder body; The inside of the heat exchanger is divided into a plurality of heat exchange cavities through a sealing structure, and each heat exchange cavity is correspondingly arranged with the compression cavity of the multi-section unequal-diameter cylinder block.
10. A multistage oil-free linear valved compressor according to any one of claims 1 to 6, wherein the compressor apparatus is provided with a mounting bracket by which the compressor apparatus is mounted on external equipment.

Description

Multistage oil-free linear valved compressor Technical Field The application relates to the technical field of mechanical manufacturing, in particular to a multistage oil-free linear valved compressor. Background In the industrial fields of food processing, pharmaceutical manufacturing, semiconductor production, low temperature engineering, high purity gas delivery, etc., the purity and stability of compressed gas have a decisive effect on the quality of the product. For example, in the food industry, compressed gas is used for packaging scenes such as nitrogen filling, air conditioning and fresh keeping, if oil stain or impurities are contained in the gas, food pollution can be caused, in the medicine field, high-purity compressed gas is a key medium in links such as medicine production and laboratory analysis, oil pollution can directly influence the purity of medicine components and the accuracy of experimental data, in the semiconductor manufacturing, processes such as wafer cleaning and etching need ultra-high-purity compressed gas, any particles or oil molecules can cause wafer defects, and in low-temperature engineering such as a liquid helium temperature zone refrigerating system, the purity of the compressed gas is directly related to refrigerating efficiency and system stability. In addition, the gases difficult to compress such as helium are widely applied to high-end fields such as nuclear magnetic resonance imaging, aerospace and the like, and the compression process needs to be compatible with high-pressure ratio output and gas molecule leakage control. However, the conventional compressor has problems of easy vibration and abrasion due to the lateral force of the piston of the crankshaft-connecting rod transmission structure, and the service life and reliability of the oil-free compressor are limited. Therefore, there is a need for a multi-stage oil-free linear valved compressor, wherein a single compressor realizes multi-stage compression, integrates an intermediate heat exchanger, can realize high-pressure ratio output, and has the advantages of oil free, low vibration, long service life and the like. The structure is very simple and compact, and no complex and messy pipeline connection exists. Disclosure of Invention The embodiment of the application provides a multistage oil-free linear valved compressor, which effectively solves the technical problems of oil-free, low vibration, long service life and the like of the compressor and realizes multistage compression and high-pressure ratio output of a single compressor. In a first aspect, an embodiment of the present application provides a multistage oil-free linear valved compressor, comprising: A compressor device including a drive assembly and a stepped compression mechanism; The stepped compression mechanism comprises a compression piston and a cylinder body, wherein the compression piston is provided with bulges along a first direction to form a stepped shape, a plurality of sections of cylinders which are different in radius and are mutually communicated along the first direction in the cylinder body form a plurality of sections of unequal-diameter cylinder bodies, and the compression piston and the plurality of sections of unequal-diameter cylinder bodies are in clearance fit to form at least two compression cavities with different radiuses; And the driving assembly is used for driving the compression piston to reciprocate in the compression cavity along a first direction so as to realize multistage gas compression. In one possible embodiment, the multi-segment unequal diameter cylinder block includes at least three segments of unequal diameter cylinder blocks of a first cylinder, a second cylinder, and a third cylinder that are sequentially arranged along a first direction; The cylinders of the first cylinder, the second cylinder and the third cylinder are communicated with each other to form a gas path; the radii of the cylinder of the first cylinder, the cylinder of the second cylinder and the cylinder of the third cylinder are different, so that two compression cavities with different radii are formed. In one possible embodiment, the compressor device further comprises an intermediate substrate, and two compressor units, namely a first compressor unit and a second compressor unit, are arranged on the intermediate substrate symmetrically along the first direction; The gas circuit of the first compressor unit and the gas circuit of the second compressor unit are connected in series to realize multistage high-pressure ratio compression output; Or, the gas circuit of the first compressor unit and the gas circuit of the second compressor unit are connected in parallel to realize multistage high-flow compression output. In one possible embodiment, the drive assembly includes a drive source and a flexible rod; The driving source comprises a shell, a motor stator, a motor rotor and a spring group, wherein the motor stator is embedded in t