CN119196033B - Shaft seal pressure reducing assembly and single screw air compressor - Google Patents

Shaft seal pressure reducing assembly and single screw air compressor Download PDF

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Publication number
CN119196033B
CN119196033B CN202411734103.0A CN202411734103A CN119196033B CN 119196033 B CN119196033 B CN 119196033B CN 202411734103 A CN202411734103 A CN 202411734103A CN 119196033 B CN119196033 B CN 119196033B
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CN
China
Prior art keywords
oil
main rotor
shaft seal
shell
casing
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Application number
CN202411734103.0A
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Chinese (zh)
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CN119196033A (en
Inventor
余卫生
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Xunliyuan Shanghai Gas Technology Co ltd
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Xunliyuan Shanghai Gas Technology Co ltd
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Priority to CN202411734103.0A priority Critical patent/CN119196033B/en
Publication of CN119196033A publication Critical patent/CN119196033A/en
Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/10—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member
    • F04C18/107—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member with helical teeth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0021—Systems for the equilibration of forces acting on the pump
    • F04C29/0028—Internal leakage control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses a shaft seal decompression assembly and a single-screw air compressor using the same, wherein the shaft seal decompression assembly comprises an upper shell, a lower shell, a rotating component and a sealing component, wherein the upper shell is arranged on the shell, the lower shell is arranged on the lower side of the upper shell and is in plug-in fit with the upper shell to form a first space, the rotating component and the sealing component are arranged in the first space and are sequentially arranged from top to bottom along the axial direction of a main rotor, the bearing component is arranged at the upper end part of the main rotor of the single-screw air compressor, and the shaft seal decompression assembly is arranged at the lower end of the main rotor so that the main rotor can be rotatably supported on the shell. The invention ensures the sealing connection between the main rotor and the shell by arranging the shaft seal oil cavity between the shell and the shaft seal decompression assembly to realize the sealing of the compression chamber, and ensures the sealing property of the connection between the main rotor and the shaft seal decompression assembly by matching the decompression cavity with the sealing component, and meanwhile, the arranged isolating ring is used for preventing lubricating oil from directly impacting the main rotor, so that the shaking phenomenon of the compressor is prevented, and the service lives of the main rotor and the sealing component are prolonged.

Description

Shaft seal decompression assembly and single screw air compressor
Technical Field
The invention belongs to the technical field of air compressors, and particularly relates to a shaft seal decompression assembly and a single screw air compressor using the same.
Background
The single screw air compressor consists of a cylindrical screw and two plane star wheels in symmetrical arrangement, and is installed inside the main casing. The space surrounded by the screw groove of the screw rod, the inner wall of the main machine shell and the tooth surface of the star wheel forms the working volume of the compressor. The motor directly drives the screw shaft to rotate, and the screw drives the star wheel to rotate. The air enters the spiral groove through the air suction port on the main machine, and is discharged through the air discharge hole on the main machine shell after being compressed. The main casing is also provided with a liquid spraying hole for spraying lubricating oil into the working volume, so as to realize the functions of sealing, cooling and lubrication. At present, a screw air compressor adopts a circulating injection mode, lubricating oil is stored in an oil tank, and the lubricating oil is driven by an oil pump to sequentially enter an oil filter, a cooler and an oil separator.
When low-pressure air is sucked into the compression chamber and compressed into high-pressure air, the axial force of the screw rod is gradually increased from the position close to the low-pressure air suction end to the high-pressure air discharge end, and the difference of the axial force of the same shaft influences the rotation of the screw rod, so that the screw rod shakes, the service life of the screw rod is shortened, and the tightness among components is also influenced.
Disclosure of Invention
In order to overcome the defects, the invention provides a shaft seal decompression assembly and a single screw air compressor.
In one aspect, the invention provides a shaft seal decompression assembly, which is configured at one side of a main rotor of a single screw air compressor, which is close to a lower end part, and is used together with a bearing assembly at the upper end part of the main rotor so as to rotatably support the main rotor on a shell of the compressor, wherein the shaft seal decompression assembly comprises an upper shell, a lower shell, a rotating part and a sealing part, wherein the upper shell is arranged on the lower side of the upper shell and is in plug-in fit with the upper shell to form a first space, the rotating part and the sealing part are arranged in the first space and are sequentially arranged from top to bottom along the axial direction of the main rotor;
The upper shell is provided with a first branch oil way communicated with the compressor oil supply system, and the rotating part comprises a first bearing which is arranged on the upper shell and sleeved on the main rotor;
the lower shell is provided with a shaft seal oil way used for communicating the first branch oil way with the first space, a groove is formed in the inner peripheral wall of the lower shell in a surrounding mode, and an outlet of the shaft seal oil way is arranged on the groove;
the sealing component is arranged on the lower shell and comprises a moving ring, a static ring and an isolating ring, wherein the moving ring and the static ring are sleeved on the main rotor in sequence from top to bottom, and the isolating ring is arranged outside the moving ring in a surrounding manner and is arranged on the lower shell;
the isolating ring seals the notch of the groove to form a pressure reducing cavity, and a notch for communicating the pressure reducing cavity with the first space is formed in the isolating ring.
As a further improvement of the invention, the lower side wall of the groove is composed of a horizontal part and an inclined part which are sequentially arranged from the bottom to the inner side of the groove along the radial direction of the main rotor, the inclined part is obliquely arranged from outside to inside and downwards, six notches are arranged on one side of the lower end face of the isolating ring around the axial annular array of the isolating ring, the top end face of the notch is obliquely arranged from inside to outside and upwards at a set angle, and the initial end of the top end face and the horizontal part are on the same horizontal plane.
As a further improvement of the invention, the upper shell and the lower shell are provided with through holes for the main rotor to pass through, the outer edge of one side of the upper shell facing the lower shell is outwards provided with an upper flange along the radial direction of the upper shell, the lower shell is provided with a lower flange which is in butt joint with the upper flange, the first branch oil way is arranged on the upper flange, and the shaft seal oil way is arranged on the lower flange;
the lower shell is close to one end of the upper perforation of the lower shell, a mounting groove for mounting the stationary ring is formed in one end of the lower shell, which is close to the upper perforation of the lower shell, the cross section of the stationary ring in the axial direction is 7-shaped, the inner peripheral wall of the stationary ring is sleeved on the main rotor in an annular mode, and the top surface of the stationary ring extends upwards out of the mounting groove and is in sliding abutting connection with the lower end face of the movable ring.
As a further improvement of the invention, the inner peripheral wall of the lower shell is respectively provided with abutting surfaces matched with the outer peripheral wall of the isolation ring at the upper side and the lower side of the groove, the lower end of the abutting surface is connected with the notch of the mounting groove through a horizontal supporting surface, and the lower end surface of the isolation ring is abutted on the supporting surface.
As a further improvement of the invention, the lower shell further comprises a plug-in part which is plugged into the upper shell, and the upper end surface of the plug-in part positions the outer ring of the first bearing in the upper shell;
The rotating member further includes a sleeve and a fixing member respectively provided at upper and lower ends of the first bearing, the sleeve and the fixing member being fixedly attached to the main rotor so as to position the inner race of the first bearing at and rotate together with the main rotor, while the sleeve is also inserted into and slidably connected with the through hole of the upper housing.
In another aspect, the present invention provides a single screw air compressor, including a casing, a main rotor disposed on the casing, and a pair of star-shaped rotors disposed on opposite sides of the main rotor and disposed on the casing;
The machine shell is provided with a compression space and a placement space which is arranged on the opposite side of the compression space and communicated with the compression space, a pair of star-shaped rotors are respectively rotatably arranged in the corresponding placement spaces, the upper end part of the main rotor is provided with a bearing assembly, and the lower end of the main rotor is provided with the shaft seal decompression assembly according to the scheme, so that the main rotor is rotatably supported on the machine shell.
As a further improvement of the invention, the shell is provided with an oil through groove on the inner wall surface of the lower port of the compression space in a ring manner, the upper shell is arranged on the lower port so as to seal the notch of the oil through groove to form a shaft seal oil cavity, and two radial ends of the oil through groove are respectively provided with a through opening;
The shell is provided with an air inlet, an oil inlet, a main oil way, a second branch oil way and an oil gas outlet,
The shaft seal oil cavity is communicated with the main oil channel and the second branch oil channel through two ports on the shaft seal oil cavity, the main oil channel is communicated with the oil inlet and is provided with an oil supply path for synchronously conveying lubricating oil to the compression space, the shaft seal oil cavity and the first branch oil channel, the second branch oil channel is used for conveying the lubricating oil entering the shaft seal oil cavity from the main oil channel to the compression space, and meanwhile, air sucked into the compression space through the air inlet and the lubricating oil entering the compression space through the main oil channel and the second branch oil channel are uniformly discharged out of the casing from the oil gas outlet after being compressed.
As a further improvement of the present invention, the bearing assembly includes a bearing housing installed at an upper port of the compression space, a second bearing provided on the bearing housing and fixedly connected to an upper end portion of the main rotor, and a bearing cap provided to the bearing housing and positioning the second bearing in the bearing housing;
The air inlet is arranged near one side of the bearing assembly;
An adjusting gasket is arranged between the upper flange of the upper shell and the shell.
As a further improvement of the invention, the oil-gas outlet is a triangular outlet arranged at one side of the compression space, the shell is provided with an oil-gas cavity for conveying oil-gas mixed fluid, the outlet of the oil-gas cavity is arranged at the opposite side of the oil inlet of the shell, and the outlet of the oil-gas cavity is provided with a one-way valve assembly;
The one-way valve assembly includes:
the valve body is arranged at the outlet of the oil air cavity and is provided with an air outlet;
The valve rod is elastically arranged on the valve body and provided with a plug arranged towards one side of an outlet of the oil gas cavity;
and the spring is sleeved on the valve rod, and two ends of the spring are respectively elastically abutted on the valve body and the plug.
As a further improvement of the invention, the oil inlet is further provided with two oil supply pipes, and the two oil supply pipes are respectively connected to the two star-shaped rotors.
The invention has the advantages that the sealing of the compression space is realized by arranging the shaft seal oil cavity between the shell and the shaft seal decompression assembly so as to ensure the tightness of the connection between the main rotor and the shell, the sealing part is arranged in the shaft seal decompression assembly and is matched with the shaft seal oil way so as to ensure the tightness of the connection between the main rotor and the shaft seal decompression assembly, and meanwhile, the arranged isolating ring is utilized to prevent lubricating oil from directly impacting the main rotor, so that the shaking phenomenon of the compressor is prevented, and the service lives of the main rotor and the sealing part are prolonged.
Drawings
FIG. 1 is a schematic view of a structure of a single screw air compressor according to the present invention;
FIG. 2 is a schematic cross-sectional view of a first view of the present invention;
FIG. 3 is a schematic cross-sectional view of a second view of the present invention;
FIG. 4 is an enlarged schematic view of the structure of FIG. 2A according to the present invention;
FIG. 5 is a schematic view of an isolating ring according to the present invention;
FIG. 6 is a schematic view of a third view of the present invention;
FIG. 7 is a schematic cross-sectional view in the direction B-B of FIG. 6 in accordance with the present invention;
FIG. 8 is a schematic view of the structure of the enclosure of the present invention;
FIG. 9 is a schematic view of the interior of the housing of the present invention with a portion cut away from its lower port.
The following description is made with reference to the accompanying drawings:
10. A main rotor; 101, helical groove, 102, screw shaft, 20, bearing assembly, 201, bearing housing, 202, second bearing, 203, bearing cap, 30, casing, 301, compression space, 302, installation space, 303, oil passage groove, 3031, port, 304, shaft seal oil cavity, 305, air inlet, 306, oil inlet, 3061, oil supply pipe, 307, main oil passage, 308, second branch oil passage, 309, oil outlet, 40, shaft seal relief assembly, 41, upper housing, 411, first branch oil passage, 412, upper flange, 42, lower housing, 421, shaft seal oil passage, 422, groove, 4221, horizontal portion, 4222, inclined portion, 423, lower flange, 424, mounting groove, 425, abutment surface, 426, support surface, 427, plug portion, 43, first space, 44, rotating member, 441, first bearing, 442, shaft sleeve, 443, fixture, 45, sealing member, 451, moving ring, 452, ring, 453, spacer ring, 4531, notch, 4532, top end face, 46, relief cavity, 47, perforation, 50, 502, plug, 501, valve body, 70, valve body, 70, plug, valve body, 7011, plug, valve body, 70.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, reference numeral 100 designates an exemplary embodiment of a single screw air compressor, and which includes a shaft seal relief assembly 40 according to an embodiment of the present disclosure, the single screw air compressor 100 generally comprising a housing 30, a main rotor 10 mounted for rotation in the housing 30, and a pair of star rotors 50 mounted for rotation in the housing 30 and engaged with the main rotor 10.
Referring to fig. 1 to 9, a casing 30 of the compressor includes a compression space 301 in the form of a cylindrical hole in which a main rotor 10 is rotatably installed. The cylindrical bore is provided with an air inlet 305 at its suction end and is closed by a discharge end wall. The main rotor 10 is generally cylindrical and has a plurality of helical grooves 101 provided thereon defining compression chambers, the main rotor 10 being provided with a screw shaft 102, opposite ends of the screw shaft 102 being rotatably supported on a bearing assembly 20 and shaft seal relief assembly 40 mounted on the housing 30. The screw shaft 102 drives the main rotor 10 to rotate about its axis.
The casing 30 is further provided at opposite sides of the compression space 301 with a disposition space 302 in communication therewith, and a pair of the star rotors 50 are respectively installed at the corresponding disposition spaces 302 such that the star rotors 50 are disposed at opposite sides (i.e., 180 degrees apart) of the main rotor 10. Each star rotor 50 has a plurality of teeth 501 and is provided with a rotor shaft 502, opposite ends of the rotor shaft 502 being rotatably mounted on the casing 30 by bearing units. When the main rotor 10 is rotatably driven by a driving source such as a motor (not shown), the teeth 501 in the star rotor 50 sequentially engage the spiral grooves 101 of the main rotor 10 and define compression chambers in cooperation with the walls of the compression space 301. An air inlet 305 is provided at the upper end of the compression chamber (i.e., near the start end side of the spiral groove 101), air is sucked into the compression chamber through the air inlet 305, compressed by the relative movement of the spiral groove 101 and the teeth 501 in meshed driving, and discharged from a triangular oil and gas outlet 309 provided on the wall of the compression space of the casing 30 near the end of the spiral groove 101. The casing 30 is provided with a lubricant oil inlet 306 and a main oil path 307 communicated with the lubricant oil inlet 306, the main oil path 307 is used for conveying lubricant oil to the compression space 301 to lubricate, cool and seal components in the compression space, the lubricant inlet 306 is also provided with two oil supply pipes 3061, and the two oil supply pipes 3061 are respectively connected to the two placement spaces 302 and are in butt joint with a bearing unit provided with the star rotor 50 to cool and lubricate the bearing unit. In addition, the casing 30 is provided with an oil-gas cavity for conveying an oil-gas mixed fluid, and the oil-gas cavity is provided with a labyrinth structure as in the prior art, and the difference is that an outlet of the oil-gas cavity is arranged on the opposite side of an oil inlet 306 of the casing 30, and a one-way valve assembly 70 is arranged at the outlet of the oil-gas cavity, the one-way valve assembly 70 comprises a valve body 701, a valve rod 702 and a spring 703 sleeved on the valve rod 702, the valve body 701 is arranged at the outlet of the oil-gas cavity and provided with an exhaust port 7011 connected with external oil-gas separation equipment, the valve rod 702 is elastically arranged on the valve body 701 and provided with a plug 7021 arranged towards one side of the outlet of the oil-gas cavity, and two ends of the spring 703 are respectively elastically abutted on the valve body 701 and the plug 7021. Under the combined action of the acting force of the spring 703 and the compressed oil gas pressure, the plug 7021 can elastically reciprocate along the axial direction of the valve rod 702 to open or close the outlet of the oil gas cavity, so that the compressed oil gas is output from the compressor, and the backflow phenomenon is prevented after the compressor is stopped, and the compressor is prevented from being damaged.
Referring to fig. 1 to 5, in contrast to the prior art, opposite ends of a main rotor 10 of an embodiment of the present disclosure are rotatably supported in a housing 30 by a bearing assembly 20 and a shaft seal relief assembly 40, respectively. The bearing assembly 20 is in a modularized structure and comprises a bearing seat 201 for installing an upper port of the compression space 301, a second bearing 202 which is arranged on the bearing seat 201 and fixedly connected with the upper end part of the main rotor 10, and a bearing cover 203 which is arranged on the bearing seat 201 in a covering manner, wherein the bearing seat 201 and the bearing cover 203 are spliced through flanges on the bearing seat 201 and the bearing cover 203 and are arranged on the machine shell 30 so as to rotatably position the upper end of the main rotor 10. An air inlet 305 is provided near one side of the bearing assembly 20 so that the sucked air is introduced into the compression space from the start of the spiral groove 101 of the main rotor 10. The other end of the main rotor 10, which is connected to the housing 30, is rotatably positioned by a shaft seal relief assembly 40. Specifically, since air (i.e., low-pressure air) is sucked into the compression space 301 through the air inlet 305, compressed to a high pressure, and discharged from the oil gas outlet 309, that is, the axial force of the rotating main rotor 10 gradually increases from the upper end (low-pressure air inlet) to the lower end (high-pressure air outlet), the difference between the axial forces at the upper end and the lower end is more obvious in the high-pressure compressor, and the rotation of the main rotor 10 is affected by the difference between the axial forces, which is manifested as a shaking phenomenon of the compressor, and the shaking of the compressor affects the tightness of the connection between the main rotor 10 and the shaft seal decompression assembly 40, and the tightness between the shaft seal decompression assembly 40 and the casing 30, and the service life of the main rotor and the tightness of the compression chamber are also affected by the synchronization.
Based on this, referring to fig. 2 to 5, the embodiment of the present disclosure provides a shaft seal pressure reducing assembly 40, the shaft seal pressure reducing assembly 40 including an upper housing 41, a lower housing 42 provided at a lower side of the upper housing 41 and in insertion fit with the upper housing 41 to form a first space 43, and a rotating member 44 and a sealing member 45 provided at the first space 43 and sequentially disposed from top to bottom in an axial direction of the main rotor 10, the main rotor 10 being connected to a driving source, that is, a motor (not shown), through the shaft seal pressure reducing assembly 40 in an axial direction thereof. Specifically, the shaft seal pressure reducing assembly 40 has a modular structure, and an adjusting washer 60 is provided between the shaft seal pressure reducing assembly and the housing 30, and the axial clearance between the main rotor 10 and the housing 30 is adjusted by changing the adjusting washer 60 with a different thickness, so that the main rotor 10 is in an optimal mounting state. In addition, since the bearing assembly 20 and the shaft seal relief assembly 40 are both of modular construction, installation and removal of the main rotor is facilitated.
The upper case 41 of the embodiment of the present disclosure is provided with a first branch oil passage 411 communicating with the main oil passage 307, and the lower case 42 is provided with a shaft seal oil passage 421 for communicating the first branch oil passage 411 with the first space 43, so that lubricating oil can be caused to enter the first space 43 to perform sealing, cooling, and lubrication functions between the respective components disposed in the first space 43. Moreover, the lubricating oil in this embodiment enters the first space 43 through the oil inlet 306 to the main oil path 307 and then through the first branch oil path 411 and the shaft seal oil path 421, and the oil supply paths are uniformly distributed on the compressor, and no additional oil supply system is provided, so that the design is ingenious and reasonable, and the overall circulation oil supply of each part of the compressor is realized.
The inner peripheral wall of the lower shell 42 is provided with a groove 422 in a ring way, the outlet of the shaft seal oil path 421 is arranged on the groove 422, the sealing component 45 is arranged on the lower shell 42 and comprises a movable ring 451 and a static ring 452 which are sleeved on the main rotor 10 in sequence from top to bottom, a separation ring 453 which is arranged outside the movable ring 451 in a ring way and is arranged on the lower shell 42, the separation ring 453 seals the notch of the groove 422 to form a decompression cavity 46, and a notch 4531 which is used for communicating the decompression cavity 46 with the first space 43 is arranged on the separation ring 453. That is, the spacer ring 453 is fixedly installed in the lower housing 42, and the inner ring surface thereof has a certain gap with the outer ring surface of the moving ring 451, so that when high pressure oil is injected into the first space 43, the lubricant will not impact the rotating main rotor due to the stop of the spacer ring 453 and the gap, and the shaking caused by unequal axial force generated on the peripheral surface thereof is avoided, thereby ensuring the lubrication, cooling and sealing effects of the main rotor 10 and the shaft seal decompression assembly 40.
The movable ring 451 is fixedly connected to the main rotor 10 and can rotate together with the main rotor 10, the stationary ring 452 is fixedly connected to the lower housing 42 in a sealing manner and is in clearance fit with the main rotor 10, that is, the stationary ring 452 does not rotate with the main rotor 10, the main rotor 10 rotates so that lubricating oil forms an oil film between the outer peripheral surface of the main rotor 10 and the inner peripheral surface of the stationary ring 452, and sealing and lubrication are achieved by the oil film formation. Specifically, the lower side wall of the groove 422 is composed of a horizontal portion 4221 and an inclined portion 4222 which are sequentially arranged from the bottom to the inner side of the groove along the radial direction of the main rotor 10, the inclined portion 4222 is arranged obliquely from the outside to the inside and downward, six notches 4531 are arranged on one side of the lower end surface of the isolating ring 453 around the axial annular array of the lower end surface, the top end surface 4532 of the notch 4531 is obliquely arranged from the inside to the outside and upward at a set angle, the inclined angle is 60 °, and the starting end of the top end surface 4532 and the horizontal portion 4221 are on the same horizontal plane, so that even though the lubricating oil entering the first space 43 still has pressure, the structural design of the notch 4531 arranged at 60 ° intervals and the rotating ring combined with the notch 4531 and the lower side wall of the groove 422 weakens the lubricating oil pressure entering the first space 43 and can symmetrically act on the rotating ring, thereby the shaking of the main rotor is avoided, the service life of the main rotor is prolonged, and the service life of the sealing member 45 is prolonged.
Further, an upper flange 412 is arranged on the outer edge of the upper casing 41 facing the lower casing 42 in a radially outward protruding manner, a lower flange 423 is arranged on the lower casing 42 and is in butt joint with the upper flange 412, a first branch oil passage 411 is arranged on the upper flange 412, a shaft seal oil passage 421 is arranged on the lower flange 423, a mounting groove 424 for mounting a static ring 452 is arranged at one end of the lower casing 42 close to an upper through hole 47 of the lower casing, the cross section of the static ring 452 in the axial direction is 7-shaped, the inner peripheral wall of the static ring 452 is sleeved on the main rotor 10 in a ring shape, the top surface extends upwards out of the mounting groove 424 and is in sliding butt joint with the lower end surface of the movable ring 451, and an oil film is generated between the end surfaces to reduce friction.
The inner peripheral wall of lower casing 42 is formed with the butt face 425 that suits with the outer peripheral wall of isolating ring 453 respectively in the upper and lower both sides of recess 422, and the lower extreme of butt face 425 passes through horizontal holding surface 426 and is connected with the notch of mounting groove 424, and isolating ring 453's lower terminal surface butt is on holding surface 426, guarantees isolating ring 453 and the stable installation of lower casing 42.
The lower housing 42 further includes a socket 427 to be inserted into the upper housing 41, an upper end surface of the socket 427 abutting an outer race of the first bearing 441 against the upper housing 41, and the rotating member 44 further includes a boss 442 and a fixing piece 443 provided at upper and lower ends of the first bearing 441, respectively, the boss 442 and the fixing piece 443 being fixedly attached to the main rotor 10 so as to position an inner race of the first bearing 441 to the main rotor 10 and rotate together with the main rotor 10, while the boss 442 is also inserted into the through hole 47 of the upper housing 41 and slidably connected with the through hole 47. In addition, the first bearing 441 employs a double ball bearing to withstand a large axial force.
Referring to fig. 3 to 9, in order to ensure tightness between the shaft seal decompression assembly 40 and the casing 30, the casing 30 is provided with an oil passage groove 303 on an inner wall surface of a lower port of the compression space 301, the upper casing 41 is mounted on the lower port to seal a notch of the oil passage groove 303 to form a shaft seal oil cavity 304, two radial ends of the oil passage groove 303 are respectively provided with a through port 3031, and the shaft seal oil cavity 304 communicates a main oil passage 307 with a second branch oil passage 308 through the two through ports 3031. The lubricating oil in this embodiment enters the main oil path 307 from the oil inlet 306 and is synchronously conveyed to the compression space 301, the shaft seal oil cavity 304 and the first branch oil path 411 through the main oil path 307, while the second branch oil path 308 is used for conveying the lubricating oil entering the shaft seal oil cavity 304 from the main oil path 307 to the compression space 301 to realize circulation of the lubricating oil, and meanwhile, air sucked into the compression space 301 from the air inlet 305 and the lubricating oil entering the compression space 301 from the main oil path 307 and the second branch oil path 308 are uniformly discharged out of the casing 30 from the oil gas outlet 309 after being compressed. The lubricating oil in this embodiment is divided into four paths after entering the compressor, one path enters the star rotors on two sides through the oil supply pipe 3061, the other paths refer to the flowing direction indicated by the arrow in fig. 7, one path directly enters the compression space through the main oil path 307, the other path sequentially enters the compression space through the shaft seal oil cavity 304 and the second branch oil path 308, and finally the other path sequentially enters the first space 43 through the first branch oil path 411, the shaft seal oil path 421 and the notch 4531, so that the oil supply is integrated, the structure is simple, the oil path is clear, and the sealing, cooling and lubrication among all the components are realized.
In summary, according to the shaft seal decompression assembly and the single-screw air compressor using the same, the shaft seal oil cavity is arranged between the shell and the shaft seal decompression assembly, so that the tightness of connection between the main rotor and the shell is ensured, the sealing of a compression space is realized, the sealing part is arranged in the shaft seal decompression assembly and matched with the shaft seal oil way, so that the tightness of connection between the main rotor and the shaft seal decompression assembly is ensured, meanwhile, the arranged isolating ring is utilized to prevent lubricating oil from directly impacting the main rotor, the shaking phenomenon of the compressor is prevented, and the service lives of the main rotor and the sealing part are prolonged.
In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only of a preferred embodiment of the invention, which can be practiced in many other ways than as described herein, so that the invention is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims (8)

1.一种轴封减压组件，配置于单螺杆式空气压缩机的主转子（10）靠近下端部的一侧，与主转子（10）上端部的轴承组件（20）一起使用，以将所述主转子（10）可旋转的支撑于压缩机的机壳（30），其特征在于：所述轴封减压组件（40）包括设于机壳（30）的上壳体（41）、设于上壳体（41）下侧并与所述上壳体（41）插接配合以形成第一空间（43）的下壳体（42）、以及设于所述第一空间（43）并沿所述主转子（10）轴向从上向下依次设置的转动部件（44）和密封部件（45）；所述主转子（10）沿其轴向穿过所述轴封减压组件（40）与驱动源连接；1. A shaft seal decompression assembly, arranged on a side of a main rotor (10) of a single-screw air compressor near a lower end, and used together with a bearing assembly (20) at an upper end of the main rotor (10) to rotatably support the main rotor (10) on a casing (30) of the compressor, characterized in that: the shaft seal decompression assembly (40) comprises an upper shell (41) arranged on the casing (30), a lower shell (42) arranged on the lower side of the upper shell (41) and plugged with the upper shell (41) to form a first space (43), and a rotating component (44) and a sealing component (45) arranged in the first space (43) and arranged in sequence from top to bottom along the axial direction of the main rotor (10); the main rotor (10) passes through the shaft seal decompression assembly (40) along its axial direction to be connected to a driving source; 所述上壳体（41）设有与压缩机供油系统连通的第一分支油路（411），所述转动部件（44）包括安装在所述上壳体（41）且套设于所述主转子（10）上的第一轴承（441）；The upper housing (41) is provided with a first branch oil path (411) communicating with the compressor oil supply system, and the rotating component (44) comprises a first bearing (441) mounted on the upper housing (41) and sleeved on the main rotor (10); 所述下壳体（42）设有用于将所述第一分支油路（411）与所述第一空间（43）连通的轴封油路（421），所述下壳体（42）的内周壁上环设有一凹槽（422），所述轴封油路（421）的出口置于该凹槽（422）上；The lower housing (42) is provided with a shaft seal oil passage (421) for connecting the first branch oil passage (411) with the first space (43); a groove (422) is provided on the inner peripheral wall of the lower housing (42); and an outlet of the shaft seal oil passage (421) is disposed on the groove (422); 所述密封部件（45）配置于所述下壳体（42），包括从上向下依次套设于所述主转子（10）上的动环（451）和静环（452）、以及环设于所述动环（451）外并安装在所述下壳体（42）上的隔离环（453）；所述动环（451）与所述主转子（10）固定连接并能随所述主转子（10）一起旋转，所述静环（452）与所述下壳体（42）密封固定连接且与所述主转子（10）间隙配合；The sealing component (45) is arranged on the lower housing (42), and comprises a moving ring (451) and a stationary ring (452) which are sequentially sleeved on the main rotor (10) from top to bottom, and an isolating ring (453) which is arranged outside the moving ring (451) and mounted on the lower housing (42); the moving ring (451) is fixedly connected to the main rotor (10) and can rotate with the main rotor (10), and the stationary ring (452) is sealed and fixedly connected to the lower housing (42) and is clearance-matched with the main rotor (10); 其中，所述隔离环（453）将所述凹槽（422）的槽口封闭以形成减压腔（46），所述隔离环（453）上开设有将所述减压腔（46）和所述第一空间（43）连通的缺口（4531）；The isolating ring (453) closes the notch of the groove (422) to form a decompression chamber (46), and the isolating ring (453) is provided with a notch (4531) for connecting the decompression chamber (46) and the first space (43); 所述凹槽（422）的下侧壁为沿所述主转子（10）径向从其槽底向内侧依次设置的水平部（4221）和倾斜部（4222）组成，所述倾斜部（4222）从外向内并向下倾斜设置，所述隔离环（453）的下端面一侧绕其轴向环形阵列有六个缺口（4531），所述缺口（4531）的顶部端面（4532）由内向外并向上以设定角度倾斜设置，且该顶部端面（4532）的起始端与所述水平部（4221）在同一水平面上；The lower side wall of the groove (422) is composed of a horizontal portion (4221) and an inclined portion (4222) which are arranged in sequence from the groove bottom to the inner side along the radial direction of the main rotor (10); the inclined portion (4222) is arranged to be inclined downward from the outside to the inside; one side of the lower end surface of the isolation ring (453) is provided with six notches (4531) in an annular array around the axial direction; the top end surface (4532) of the notch (4531) is arranged to be inclined upward from the inside to the outside at a set angle, and the starting end of the top end surface (4532) is on the same horizontal plane as the horizontal portion (4221); 所述上壳体（41）和下壳体（42）上均开设有供所述主转子（10）穿过的穿孔（47），所述上壳体（41）朝向所述下壳体（42）一侧的外缘沿其径向向外凸设有上法兰（412），所述下壳体（42）具有与所述上法兰（412）对接的下法兰（423），所述第一分支油路（411）布置于所述上法兰（412），所述轴封油路（421）布置于所述下法兰（423）；The upper shell (41) and the lower shell (42) are both provided with a through hole (47) for the main rotor (10) to pass through; an outer edge of the upper shell (41) facing the lower shell (42) is provided with an upper flange (412) protruding outwardly along its radial direction; the lower shell (42) has a lower flange (423) butted against the upper flange (412); the first branch oil path (411) is arranged on the upper flange (412); and the shaft seal oil path (421) is arranged on the lower flange (423); 所述下壳体（42）靠近其上穿孔（47）的一端设有用于安装所述静环（452）的安装槽（424），所述静环（452）的轴向上的截面呈“7”字形，其内周壁呈环形套设于所述主转子（10）上，顶面向上延伸出所述安装槽（424）并与所述动环（451）的下端面滑动抵接。An installation groove (424) for installing the stationary ring (452) is provided at one end of the lower shell (42) close to the through hole (47) thereon. The axial cross-section of the stationary ring (452) is in the shape of a letter "7". Its inner peripheral wall is annularly sleeved on the main rotor (10). The top surface extends upward from the installation groove (424) and is in sliding contact with the lower end surface of the moving ring (451). 2.根据权利要求1所述的轴封减压组件，其特征在于：所述下壳体（42）的内周壁在所述凹槽（422）的上下两侧分别形成有与所述隔离环（453）的外周壁相适配的抵接面（425），所述抵接面（425）的下端通过水平的支撑面（426）与所述安装槽（424）的槽口连接，所述隔离环（453）的下端面抵接于所述支撑面（426）上。2. The shaft seal pressure reducing assembly according to claim 1 is characterized in that: the inner circumferential wall of the lower shell (42) is respectively formed with abutment surfaces (425) on the upper and lower sides of the groove (422) and adapted to the outer circumferential wall of the isolation ring (453); the lower end of the abutment surface (425) is connected to the notch of the mounting groove (424) through a horizontal supporting surface (426), and the lower end surface of the isolation ring (453) abuts against the supporting surface (426). 3.根据权利要求2所述的轴封减压组件，其特征在于：所述下壳体（42）还包括插接于所述上壳体（41）内的插接部（427），所述插接部（427）的上端面将所述第一轴承（441）的外圈定位于所述上壳体（41）内；3. The shaft seal decompression assembly according to claim 2, characterized in that: the lower housing (42) further comprises a plug-in portion (427) plugged into the upper housing (41), and the upper end surface of the plug-in portion (427) positions the outer ring of the first bearing (441) in the upper housing (41); 所述转动部件（44）还包括分别设于所述第一轴承（441）上下两端的轴套（442）和固定件（443），所述轴套（442）和固定件（443）均固定地附接到所述主转子（10），以便将所述第一轴承（441）的内圈定位于所述主转子（10）并与所述主转子（10）一起旋转，同时所述轴套（442）还穿置于所述上壳体（41）的穿孔（47）内并与该穿孔（47）滑动连接。The rotating component (44) further comprises a shaft sleeve (442) and a fixing member (443) respectively arranged at the upper and lower ends of the first bearing (441); the shaft sleeve (442) and the fixing member (443) are both fixedly attached to the main rotor (10) so as to position the inner ring of the first bearing (441) on the main rotor (10) and rotate together with the main rotor (10); and the shaft sleeve (442) is also inserted into a through hole (47) of the upper shell (41) and is slidably connected to the through hole (47). 4.一种单螺杆式空气压缩机，其特征在于：包括机壳（30）、设于所述机壳（30）的主转子（10），以及一对设于机壳（30）并布置于所述主转子（10）相对侧的星形转子（50）；4. A single-screw air compressor, characterized in that it comprises a casing (30), a main rotor (10) disposed on the casing (30), and a pair of star rotors (50) disposed on the casing (30) and arranged on opposite sides of the main rotor (10); 所述机壳（30）上具有压缩空间（301）、以及设于所述压缩空间（301）的相对侧且与之连通的安置空间（302），一对所述星形转子（50）分别可旋转的安装在对应的安置空间（302），所述主转子（10）的上端部配置轴承组件（20），下端配置如权利要求1至3任意一项所述的轴封减压组件（40），以便所述主转子（10）可旋转的支撑于所述机壳（30）。The casing (30) has a compression space (301) and an accommodation space (302) arranged on the opposite side of the compression space (301) and connected to the compression space (301), and a pair of star rotors (50) are rotatably installed in the corresponding accommodation spaces (302). The upper end of the main rotor (10) is provided with a bearing assembly (20), and the lower end is provided with a shaft seal pressure reducing assembly (40) as described in any one of claims 1 to 3, so that the main rotor (10) can be rotatably supported on the casing (30). 5.根据权利要求4所述的单螺杆式空气压缩机，其特征在于：所述机壳（30）在压缩空间（301）的下端口的内壁面上环设有一通油凹槽（303），所述上壳体（41）安装于该下端口以将所述通油凹槽（303）的槽口封闭形成轴封油腔（304），所述通油凹槽（303）径向的两端分别开设有通口（3031）；5. The single-screw air compressor according to claim 4, characterized in that: the casing (30) is provided with an oil-passing groove (303) on the inner wall surface of the lower port of the compression space (301), the upper casing (41) is mounted on the lower port to seal the notch of the oil-passing groove (303) to form a shaft seal oil chamber (304), and the two radial ends of the oil-passing groove (303) are respectively provided with openings (3031); 所述机壳（30）设有进气口（305）、进油口（306）、主油路（307）、第二分支油路（308）及油气出口（309）；The housing (30) is provided with an air inlet (305), an oil inlet (306), a main oil circuit (307), a second branch oil circuit (308) and an oil and gas outlet (309); 所述轴封油腔（304）通过其上的两个通口（3031）将所述主油路（307）和第二分支油路（308）连通，所述主油路（307）与进油口（306）相通，并具有将润滑油同步输送至所述压缩空间（301）、轴封油腔（304）及所述第一分支油路（411）的供油路径；所述第二分支油路（308）用于将从所述主油路（307）进入轴封油腔（304）内的润滑油输送至所述压缩空间（301）；同时由所述进气口（305）吸入所述压缩空间（301）的空气以及由主油路（307）和第二分支油路（308）进入所述压缩空间（301）的润滑油经压缩后统一从所述油气出口（309）排出所述机壳（30）。The shaft seal oil chamber (304) communicates with the main oil circuit (307) and the second branch oil circuit (308) through two openings (3031) thereon; the main oil circuit (307) is communicated with the oil inlet (306) and has an oil supply path for synchronously conveying lubricating oil to the compression space (301), the shaft seal oil chamber (304) and the first branch oil circuit (411); the second branch oil circuit (308) is used to convey lubricating oil entering the shaft seal oil chamber (304) from the main oil circuit (307) to the compression space (301); at the same time, the air sucked into the compression space (301) through the air inlet (305) and the lubricating oil entering the compression space (301) from the main oil circuit (307) and the second branch oil circuit (308) are compressed and uniformly discharged from the casing (30) through the oil and gas outlet (309). 6.根据权利要求5所述的单螺杆式空气压缩机，其特征在于：所述轴承组件（20）包括安装在所述压缩空间（301）上端口的轴承座（201）、设于轴承座（201）上并与所述主转子（10）上端部固定连接的第二轴承（202）、以及盖设于所述轴承座（201）并将所述第二轴承（202）定位于所述轴承座（201）内的轴承盖（203）；6. The single-screw air compressor according to claim 5, characterized in that: the bearing assembly (20) comprises a bearing seat (201) mounted on the upper port of the compression space (301), a second bearing (202) disposed on the bearing seat (201) and fixedly connected to the upper end of the main rotor (10), and a bearing cover (203) disposed on the bearing seat (201) and positioning the second bearing (202) in the bearing seat (201); 所述进气口（305）靠近所述轴承组件（20）的一侧设置；The air inlet (305) is arranged close to a side of the bearing assembly (20); 所述上壳体（41）的上法兰（412）与机壳（30）之间设有调节垫片（60）。An adjusting gasket (60) is provided between the upper flange (412) of the upper shell (41) and the casing (30). 7.根据权利要求6所述的单螺杆式空气压缩机，其特征在于：所述油气出口（309）为开设于所述压缩空间（301）一侧的三角形出口，所述机壳（30）设有用于输送油气混合流体的油气腔，所述油气腔的出口设于所述机壳（30）的进油口（306）的相对侧，且所述油气腔的出口安装有单向阀组件（70）；7. The single-screw air compressor according to claim 6, characterized in that: the oil-gas outlet (309) is a triangular outlet opened on one side of the compression space (301), the casing (30) is provided with an oil-gas chamber for conveying an oil-gas mixed fluid, the outlet of the oil-gas chamber is provided on the opposite side of the oil inlet (306) of the casing (30), and a one-way valve assembly (70) is installed at the outlet of the oil-gas chamber; 所述单向阀组件（70）包括：The one-way valve assembly (70) comprises: 阀体（701），安装于所述油气腔的出口，其上设有排气口（7011）；A valve body (701) is installed at the outlet of the oil-gas chamber and is provided with an exhaust port (7011); 阀杆（702），弹性设置于所述阀体（701），具有朝向所述油气腔的出口一侧设置的堵头（7021）；A valve stem (702) is elastically arranged on the valve body (701) and has a plug (7021) arranged on one side of the outlet of the oil-gas chamber; 弹簧（703），套设于所述阀杆（702），且两端分别弹性抵接于所述阀体（701）和堵头（7021）上。The spring (703) is sleeved on the valve stem (702), and two ends of the spring are elastically abutted against the valve body (701) and the plug (7021) respectively. 8.根据权利要求7所述的单螺杆式空气压缩机，其特征在于：所述进油口（306）还设有两个供油管（3061），两个所述供油管（3061）分别连接至两个所述星形转子（50）。8. The single-screw air compressor according to claim 7, characterized in that: the oil inlet (306) is further provided with two oil supply pipes (3061), and the two oil supply pipes (3061) are respectively connected to the two star rotors (50).
CN202411734103.0A 2024-11-29 2024-11-29 Shaft seal pressure reducing assembly and single screw air compressor Active CN119196033B (en)

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