CN-122014616-A - Integrated permanent magnet synchronous two-stage compression screw air compressor

CN122014616ACN 122014616 ACN122014616 ACN 122014616ACN-122014616-A

Abstract

The invention relates to the technical field of air compressors and discloses an integrated permanent magnet synchronous two-stage compression screw air compressor which comprises a two-stage screw structure, a flange block, a first-stage screw structure and a permanent magnet synchronous motor, wherein the first-stage screw structure and the second-stage screw structure are horizontally connected through the flange block, air compressed by the first-stage screw structure enters the second-stage screw structure from an air flow passage in the flange block to be secondarily compressed, a groove for arranging a sealing ring is arranged on a contact surface of the flange block, which is connected with the second-stage screw structure and the first-stage screw structure, a pressurizing sealing groove and a magnetic fluid sealing groove are sequentially arranged from a central cavity to the outside, the sealing ring arranged in the pressurizing sealing groove is of a bag body structure, one side of the sealing ring can be contacted with high-pressure air in the flange block, the sealing ring arranged in the magnetic fluid sealing groove is of a bag body structure, and magnetic powder capable of flowing is arranged in the sealing bag.

Inventors

LI HONGMING
ZHAN LEIJUN
XU YANFEN
XU YIFENG
WU ZHIFANG
MEI GUANGLEI
ZHANG QINGXIAO
ZENG YANPING

Assignees

浙江象睿机电设备有限公司

Dates

Publication Date: 20260512
Application Date: 20260403

Claims (8)

1. The utility model provides an integral type permanent magnet synchronous two-stage compression screw air compressor, includes equipment box (101) and sets up at its inside compression structure (1), compression structure (1) include second grade screw structure (102), flange piece (2), one-level screw structure (103) and permanent magnet synchronous motor (104), its characterized in that: The magnetic powder sealing device is characterized in that a pair of meshed male and female rotors are respectively arranged in the secondary screw structure (102) and the primary screw structure (103), the primary screw structure (103) and the secondary screw structure (102) are horizontally connected through a flange block (2), a passage for gas circulation is arranged in the flange block (2), gas compressed by the primary screw structure (103) enters the secondary screw structure (102) from the air flow passage in the flange block (2) for secondary compression, a groove for arranging a sealing ring is arranged on a contact surface of the flange block (2) connected with the secondary screw structure (102) and the primary screw structure (103), a pressurizing sealing groove (21) and a magnetic fluid sealing groove (23) are sequentially arranged outwards from a central cavity, the sealing ring arranged in the pressurizing sealing groove (21) is of a bag body structure, one side of the sealing ring can be in contact with high-pressure gas in the flange block (2), the sealing ring arranged in the magnetic fluid sealing groove (23) is of a bag body structure, and the bag body arranged in the sealing groove (23) is of a flexible sealing bag body filled with magnetic fluid and liquid fluid, and when a permanent magnet synchronous motor (104) works, the magnetic force is tightly adhered to the side wall of the flange block (2).
2. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 1, wherein one end of a male rotor in the primary screw structure (103) is connected with and driven by a permanent magnet synchronous motor (104), and the other end is provided with a gear and is meshed with a gear at the end of the male rotor in the secondary screw structure (102) in the flange block (2).
3. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 2, wherein the whole cavity communicated with the secondary screw structure (102) and the primary screw structure (103) is in a round rectangular shape, and the pressurizing seal groove (21) and the magnetic fluid seal groove (23) are matched with the cavity shape.
4. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 1, wherein a pressurizing channel (212) is arranged at the bottom of the pressurizing seal groove (21), the pressurizing channel (212) is in a notch shape, one end of the pressurizing channel is connected with the pressurizing seal groove (21), the other end of the pressurizing channel is arranged on the side wall of the cavity opening of the flange block (2), and the pressurizing channels (212) are arranged in an array at intervals along the side wall of the flange block (2).
5. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 4, wherein at least two compression seal grooves (21) are arranged, the adjacent compression seal grooves (21) are different in depth, and the depth away from the center of the flange block (2) is deeper.
6. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 1, wherein a self-compensating seal groove (22) with a matched shape is arranged between the pressurizing seal groove (21) and the magnetic fluid seal groove (23), a metal ring (221) capable of being attracted by magnetic force is arranged in a seal ring arranged in the self-compensating seal groove (22), the shape of the metal ring (221) is matched with that of the self-compensating seal groove (22), two metal rings are arranged and are respectively contacted with a wall surface close to the magnetic fluid seal groove (23) and a wall surface of the pressurizing seal groove (21), and the seal ring completely wraps the metal ring (221).
7. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 3, wherein the magnetic fluid seal groove (23) is segmented and divided into a fillet section notch and a right-angle section notch.
8. The integrated permanent magnet synchronous two-stage compression screw air compressor of claim 1 or 7, wherein the capsule filling medium in the magnetic fluid sealing groove (23) is nano carbonyl iron powder magnetic powder and synthetic hydrocarbon carrier liquid, and a stabilizer and a defoaming agent.

Description

Integrated permanent magnet synchronous two-stage compression screw air compressor Technical Field The invention relates to the technical field of air compressors, in particular to an integrated permanent magnet synchronous two-stage compression screw air compressor. Background The bipolar screw air compressor is an efficient and energy-saving air compression device, and the core design of the bipolar screw air compressor is to divide the compression process into two stages. The air firstly enters the low-pressure screw main machine, is compressed to the intermediate pressure, and then is not directly discharged, but enters the intercooler for full cooling. And the cooled low-temperature air enters the high-pressure screw main machine for secondary compression, and finally the required higher working pressure is achieved. This "compression-cooling-recompression" stepped design significantly reduces the compression ratio and temperature rise per stage of compression. The core advantage of the device is that the energy efficiency is greatly improved, and the second-stage compression power consumption is obviously reduced because the cooled air has larger density and smaller volume, and the overall energy consumption can be reduced by about 10-15% compared with a single-stage screw machine. Meanwhile, the two-stage compression balances the bearing load, reduces the exhaust temperature, reduces the aging risk of lubricating oil, prolongs the service lives of a main machine and key components, and ensures that the whole machine operates more reliably and stably. The device is particularly suitable for the industrial fields requiring medium-high pressure and continuous stable air sources and focusing on long-term operation cost, and is an ideal choice for energy-saving reconstruction and air compression station upgrading of modern industrial enterprises. The common bipolar screw air compressor structure is disclosed in patent number CN119532199A, two screw compression structures are connected with each other through a flange connecting block, so that air flows from the primary screw compression structure to the secondary screw compression structure, high-pressure air can be introduced into the flange blocks for connection through the connecting structure, the sealing difficulty is greatly increased, and meanwhile, the maintenance process of the flange blocks is extremely troublesome because of the limitation of the connecting structure, and the damage probability of the flange blocks is reduced while the sealing strength of the sealing structure is ensured. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides an integrated permanent magnet synchronous two-stage compression screw air compressor, which has the advantage of enhanced sealing and solves the problem of sealing a connecting passage. (II) technical scheme The integrated permanent magnet synchronous two-stage compression screw air compressor comprises an equipment box body and a compression structure arranged in the equipment box body, wherein the compression structure comprises a second-stage screw structure, a flange block, a first-stage screw structure and a permanent magnet synchronous motor, a pair of meshed male and female rotors are respectively arranged in the second-stage screw structure and the first-stage screw structure, the first-stage screw structure and the second-stage screw structure are horizontally connected through the flange block, a passage for gas circulation is arranged in the flange block, compressed gas of the first-stage screw structure enters the second-stage screw structure from an air flow passage in the flange block to be secondarily compressed, a groove for arranging a sealing ring is arranged on a contact surface between the flange block and the second-stage screw structure, a pressurizing sealing groove and a magnetic fluid sealing groove are sequentially arranged outside a central cavity, the sealing ring arranged in the pressurizing sealing groove is of a bag body structure, one side of the sealing ring can be in contact with high-pressure air in the flange block, the sealing ring arranged in the magnetic fluid sealing groove is of the bag body structure, and the sealing bag is provided with a movable magnetic powder which can be tightly adhered to the side wall of the flange block when the permanent magnet synchronous motor works, and magnetic powder is conducted along the shaft block. One end of the male rotor in the primary screw structure is connected with and driven by the permanent magnet synchronous motor, and the other end is provided with a gear which is meshed with the gear of the male rotor end in the secondary screw structure in the flange block for driving. The flange block is in a round rectangular shape with the whole cavity communicated with the secondary screw structure and the primary screw structure, and the pressurizing seal groov