CN114623079A - Coaxial conical screw compressor and assembly method thereof - Google Patents

Coaxial conical screw compressor and assembly method thereof Download PDF

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Publication number
CN114623079A
CN114623079A CN202210311439.0A CN202210311439A CN114623079A CN 114623079 A CN114623079 A CN 114623079A CN 202210311439 A CN202210311439 A CN 202210311439A CN 114623079 A CN114623079 A CN 114623079A
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shell
rotor
bearing
connecting piece
motor
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CN202210311439.0A
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CN114623079B (en
Inventor
何志龙
王潇
胡汪锋
王菲
丘宏烨
邢子文
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Xian Jiaotong University
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Xian Jiaotong University
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    • 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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • 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
    • 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
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston 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
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • 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
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • F04C2240/605—Shaft sleeves or details thereof

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

Abstract

A coaxial conical screw compressor and its assembly method, the compressor includes the driving motor that is set up in the motor shell and conical screw rotor that is set up in the rotor shell, the motor shell couples to end of one side of the rotor shell through the shell link; the two end surfaces of the shell connecting piece are mutually intersected, and the intersection angle of the surface normal is equal to the intersection angle of the axes of the inner rotor and the outer rotor of the conical screw rotor; a hub type bearing seat is arranged in the shell connecting piece, a bearing mounting cylinder is arranged on the hub type bearing seat, and a connecting piece bearing for supporting the inner rotor shaft and the motor rotor shaft and a coupler for connecting the inner rotor shaft and the motor rotor shaft are arranged in the bearing mounting cylinder; an outer rotor bearing for supporting the two ends of the outer rotor is arranged in the rotor shell; and the other end face of the motor shell is provided with an air suction end cover, the other end face of the rotor shell is connected with an exhaust end cover through an oil-gas separator, and the oil-gas separator is communicated with an exhaust port of the conical screw rotor. The invention can improve the stability of the compressor structure.

Description

Coaxial conical screw compressor and assembly method thereof
Technical Field
The invention belongs to the field of compressor structure design, and particularly relates to a coaxial conical screw compressor and an assembly method thereof.
Background
The twin screw compressor is a positive displacement rotary compressor for obtaining high pressure gas and has wide application in modern industry. The core of the twin-screw compressor is a pair of meshed rotors, and the structure of the twin-screw compressor directly determines the overall performance of the compressor, so that the improvement of the rotor structure is always a key means for achieving the goals of energy conservation and performance improvement. The inner meshing conical rotor structure is regarded as a rotor structure improvement measure with great potential in improving the performance of the double-screw compressor. The rotor structure is a pair of inner and outer rotors with space inner meshing relation, and the rotating shafts of the inner and outer rotors are crossed and form an angle. Referring to fig. 1, it can be seen that the outer rotor axis 1 forms an angle with the inner rotor axis 2. The advantages brought by this structure are twofold: on one hand, the internal engagement can enable the structure to be more compact than the external engagement, and the assembly of a shell is not needed, so that the space can be saved and parts can be reduced; on the other hand, the conical rotor structure can realize internal compression of gas, allows axial suction and exhaust, and can avoid designing an air inlet and exhaust hole, thereby reducing noise caused by exhaust and simplifying the structural design of the compressor. Generally speaking, the conical screw compressor has the advantages of miniaturization and low noise compared with the traditional double-screw compressor. However, the new type of inner meshing conical rotor structure also adds difficulty to the overall structural design of the compressor. When the inner gearing conical rotor structure is applied to the field of the double-screw compressor, the structure of the traditional parallel-shaft double-screw compressor is not applicable due to the problem that the rotating shafts of the inner rotor and the outer rotor are not parallel. Therefore, in order to develop a new and efficient conical screw compressor, a new compressor structure is urgently needed to be designed to provide technical support.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a coaxial conical screw compressor and an assembly method thereof, so that the axes of the rotating shafts of the compressor are kept on the same straight line, the stability of the whole structure is improved, and the processing difficulty is reduced.
In order to achieve the purpose, the invention has the following technical scheme:
a coaxial conical screw compressor comprises a driving motor arranged in a motor shell and a conical screw rotor arranged in a rotor shell, wherein the motor shell is connected with one side end face of the rotor shell through a shell connecting piece; the two end surfaces of the shell connecting piece are mutually intersected, and the intersection angle of the surface normal is equal to the intersection angle of the axes of the inner rotor and the outer rotor of the conical screw rotor; a hub type bearing seat is arranged in the shell connecting piece, a bearing mounting cylinder is arranged on the hub type bearing seat, and a connecting piece bearing for supporting the inner rotor shaft and the motor rotor shaft and a coupler for connecting the inner rotor shaft and the motor rotor shaft are arranged in the bearing mounting cylinder; an outer rotor bearing for supporting the two ends of the outer rotor is arranged in the rotor shell; and the other end face of the motor shell is provided with an air suction end cover, the other end face of the rotor shell is connected with an exhaust end cover through an oil-gas separator, and the oil-gas separator is communicated with an exhaust port of the conical screw rotor.
Preferably, one end face of the motor housing and one end face of the rotor housing, which are connected through the housing connecting piece, are circular faces with equal radius, the axis of the housing connecting piece is perpendicular to the rotating part mounting face, the housing connecting piece is formed by stretching from the rotating part mounting face to the motor part mounting face, the cross section is formed by connecting two intersecting circles through tangent lines, each intersecting circle has the same radius as the circular face of the housing connecting piece, the length of the tangent line is equal to the distance d between two centers of circles, and the calculation expression is as follows:
Figure BDA0003568503600000021
in the formula I1Is the outer rotor axis length, /)2The inner rotor axis length.
Preferably, both ends of the housing connecting piece are connected with the end surfaces of the motor housing and the rotor housing through threads.
Preferably, rubber gaskets are arranged between the two ends of the shell connecting piece and the end surfaces of the motor shell and the rotor shell.
Preferably, the hub type bearing seat further comprises a circular rim and a plurality of spokes, the bearing mounting cylinder is arranged at the center of the rim, the spokes are connected between the inner side of the rim and the outer wall of the bearing mounting cylinder, and an air suction channel is formed by gaps among the spokes, the rim and the bearing mounting cylinder.
Preferably, an inner thread is formed on one side end face of the shell connecting piece connected with the motor shell, and a matched outer thread is formed on the periphery of the wheel rim.
Preferably, a bearing retainer ring is further arranged in the bearing installation cylinder, the bearing retainer ring is arranged between the two connecting piece bearings, and the connecting piece bearings for supporting the inner rotor shaft and the motor rotor shaft and the bearing retainer ring are both sleeved on the coupler; the inner rotor shaft is provided with a bearing mounting seat, the bottom of the bearing mounting cylinder is a supporting seat, and the inner wall of the bearing mounting cylinder is a supporting wall; the connecting piece bearing and the bearing retainer ring are axially fixed with the bearing mounting seat through the supporting seat and radially fixed through the supporting wall.
Preferably, the outer walls of the two ends of the outer rotor are provided with bearing grooves, and the outer rotor bearing is fixed by the bearing blocks which are arranged on the inner wall of the rotor shell through the matching of the two bearing grooves.
Preferably, the air intake end cover is provided with an air intake valve, and the air exhaust end cover is provided with an air exhaust valve.
The invention also provides an assembly method of the coaxial conical screw compressor, which comprises the following steps:
an outer rotor bearing for supporting the two ends of the outer rotor is arranged in the rotor shell;
installing a conical screw rotor on the fixed outer rotor bearing;
connecting one side end face of the shell connecting piece with one side end face of the rotor shell;
installing a coupling on the inner rotor shaft and installing a connecting piece bearing for supporting the inner rotor shaft;
installing a hub type bearing seat in the shell connecting piece, enabling a bearing installation cylinder on the hub type bearing seat to be sleeved on a connecting piece bearing, and fixing the connecting piece bearing;
installing a driving motor, installing a motor rotor shaft on the other side of the coupler by penetrating through the bearing installation cylinder, and then sleeving a motor installation shell on the driving motor to be connected with the end face of the other side of the shell connecting piece;
and the oil-gas separator and the exhaust end cover are sequentially arranged on the other end face of the rotor shell, and the air suction end cover is arranged on the other end face of the motor mounting shell.
Compared with the prior art, the invention has the following beneficial effects:
the motor shell is connected with the end face of the rotor shell through the shell connecting piece, the two end faces of the shell connecting piece are mutually intersected, the size of the intersection angle of the surface normal lines is equal to the intersection angle of the inner rotor axis and the outer rotor axis of the conical screw rotor, the problem that the rotating shafts are not parallel caused by the conical rotor can be solved, and normal meshing transmission between the inner rotor and the outer rotor is guaranteed. The shell connecting piece is arranged between the rotating part and the motor part and is in the middle of the overall structure of the compressor, so that the vibration caused by the unparallel of the inner rotor and the outer rotor can be balanced in the working process of the compressor, the overall structure is more stable, and the working state is safer. On the other hand, install wheel hub type bearing frame in the casing connecting piece, be equipped with bearing installation section of thick bamboo on the wheel hub type bearing frame, be provided with the connecting piece bearing that supports inner rotor axle and electric motor rotor axle and be used for connecting the shaft coupling of inner rotor axle and electric motor rotor axle in the bearing installation section of thick bamboo, wheel hub type bearing frame provides the bearing installation effect for semi-enclosed interior meshing toper double screw compressor, and the operation degree of difficulty that actually processes has been reduced greatly in this design, has higher bearing stability simultaneously. Meanwhile, the spoke design of the hub-shaped bearing seat can serve as a suction channel of the semi-closed inner meshing conical double-screw compressor, so that the design that suction gas can pass through and the motor is cooled is guaranteed, and meanwhile, the gas is slightly influenced by the inclined plane of the compressor, so that the loss of inlet pressure is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of the rotor profile of an internally meshing conical twin-screw compressor.
FIG. 2(a) is a schematic view of the center distance of the shell connecting piece size calculation process of the coaxial conical screw compressor of the invention;
FIG. 2(b) is a graph showing the relationship between the inner and outer rotor axes during the calculation of the size of the casing connecting member of the coaxial conical screw compressor according to the present invention;
FIG. 3(a) is a schematic perspective view of the shell connector of the coaxial conical screw compressor of the present invention;
FIG. 3(b) is a sectional view of the shell connecting member of the coaxial conical screw compressor according to the present invention;
FIG. 3(c) is a schematic sectional view of the housing connecting member of the present invention in an assembled state with the motor housing and the rotary housing;
FIG. 4(a) is a schematic perspective view of a hub-shaped bearing seat of the coaxial conical screw compressor according to the present invention;
FIG. 4(b) is a schematic cross-sectional view of the hub-shaped bearing seat of the coaxial conical screw compressor according to the present invention;
FIG. 5 is a sectional view of the assembled structure of the coaxial conical screw compressor of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 5, a coaxial conical screw compressor according to an embodiment of the present invention includes a driving motor 14 disposed in a motor housing 15 and a conical screw rotor 13 disposed in a rotor housing 12, wherein the motor housing 15 is connected to one end surface of the rotor housing 12 through a housing connector 5. Referring to fig. 3(a) and 3(b), the two end faces of the housing connection member 5 intersect each other at an angle equal to the intersection angle of the inner and outer rotor axes of the conical screw rotor 13, i.e., the angle α between the outer rotor axis 1 and the inner rotor axis 2. The two ends of the housing connecting piece 5 are connected with the motor housing 15 and the end face of the rotor housing 12 through threads. Rubber gaskets are arranged between the two ends of the shell connecting piece 5 and the end surfaces of the motor shell 15 and the rotor shell 12. One side end surface of the motor housing 15 and the rotor housing 12 connected by the housing connection member 5 is a circular surface with the same radius, the axis of the housing connection member 5 is perpendicular to the rotating member mounting surface 12a, the housing connection member 5 is stretch-formed from the rotating member mounting surface 12a to the motor member mounting surface 15a, as shown in fig. 3(c), the cross-sectional size is two intersecting circles formed by connecting tangent lines, each intersecting circle has the same radius as the circular surface of the housing connection member 5, the tangent line length is equal to the distance d between two centers, as shown in fig. 2(a), the expression is calculated as follows:
Figure BDA0003568503600000051
in the formula I1Is the length of the outer rotor axis 1, l2The length of the inner rotor axis 2.
A hub-type bearing seat 8 is mounted in the housing connection member 5, the hub-type bearing seat 8 is mounted on the bearing seat mounting seat 6 shown in fig. 3(a), the center of the housing connection member 5 is an air suction passage 7, a mounting surface 5a shown in fig. 3(b) is a mounting surface of the motor housing 15, and a mounting surface 5b is a mounting surface of the rotor housing 12. As shown in fig. 4(a) and 4(b), the hub-type bearing seat 8 is provided with a bearing mounting cylinder 10, and the bearing mounting cylinder 10 is provided therein with a connecting member bearing 18 for supporting the inner rotor shaft 16 and the motor rotor shaft 17 and a coupling 20 for connecting the inner rotor shaft 16 and the motor rotor shaft 17. The hub type bearing seat 8 further comprises a circular rim 9a and a plurality of spokes 9b, the bearing mounting cylinder 10 is arranged in the center of the rim 9a, the spokes 9b are connected between the inner side of the rim 9a and the outer wall of the bearing mounting cylinder 10, and an air suction channel 11 is formed by gaps among the spokes 9b, the rim 9a and the bearing mounting cylinder 10. The end surface of the housing connecting member 5 on the side connected to the motor housing 15 is formed with an internal thread formed on the mounting surface 6a shown in fig. 3(b), and the outer periphery of the rim 9a is formed with a mating external thread. A bearing retainer ring 19 is also arranged in the bearing mounting cylinder 10, the bearing retainer ring 19 is arranged between the two connecting piece bearings 18, and the connecting piece bearings 18 and the bearing retainer ring 19 which support the inner rotor shaft 16 and the motor rotor shaft 17 are both sleeved on the coupler 20; a bearing mounting seat 16a is arranged on the inner rotor shaft 16, the bottom of the bearing mounting cylinder 10 is a supporting seat 10b, and the inner wall of the bearing mounting cylinder 10 is a supporting wall 10 a; the coupling bearing 18 and the bearing retainer 19 are axially fixed to the bearing mount 16a by the support base 10b and radially fixed by the support wall 10 a. The rotor housing 12 is provided inside with a first outer rotor bearing 25 and a second outer rotor bearing 26 that support both ends of the outer rotor. The other end face of the motor shell 15 is provided with an air suction end cover 21, the other end face of the rotor shell 12 is connected with an exhaust end cover 23 through an oil-gas separator 22, and the oil-gas separator 22 is communicated with an exhaust port of the conical screw rotor 13. Bearing grooves are processed on the outer walls of the two ends of the outer rotor, and the outer rotor bearing is fixed through bearing blocks which are processed on the inner wall of the rotor shell 12 in a matching mode through the two bearing grooves. The intake end cover 21 is provided with an intake valve 24a, and the exhaust end cover 23 is provided with an exhaust valve 24 c. Compressor suction enters from the air intake valve 24a on the air intake end cover 21, passes through and cools the drive motor 14, enters the housing connection 5, passes from the hub type bearing block 8, and enters the volume cavity 24b between the inner and outer rotors of the conical screw rotor 13, achieving gas compression.
The shell connecting piece 5 is in an inclined cylinder shape as a whole, two end faces are mutually intersected, the intersection angle of a surface normal is equal to the intersection angle of the axes of the inner rotor and the outer rotor of the conical screw, the shell connecting piece 5 ensures that the inner rotor and the motor rotor are coaxially arranged through the design of the two intersected end faces, the transmission of the intersected axes of the inner rotor and the outer rotor is realized, meanwhile, the motor shell 15 and the rotor shell 12 can be hermetically connected, the motor shell of the compressor is separated from the rotating part shell, and the vibration effect of the compressor is weakened to a certain extent. The hub-shaped bearing seat 8 takes a hub-shaped mounting frame as a main body, a cylindrical bearing seat is arranged at the center of the hub shape for mounting a bearing, and the main shaft and the coupling 20 penetrate through the central line of the main shaft to ensure the connection of the motor rotor and the inner rotor. The rim 9a is provided with a mounting threaded hole, the rim 9a and the bearing mounting cylinder 10 are connected through a spoke 9b, and the space between the spoke 9b and the spoke 9b is used for air path design.
When the compressor is in work, the driving motor 14 operates, the motor rotor shaft 17 enables the shaft coupler 20 and the inner rotor shaft 16 to rotate simultaneously, the hub-shaped bearing seat 8 is installed inside the shell connecting piece 5, the connecting piece bearing 18 is fixed in the working process, the whole rotating shaft is guaranteed to be straight, and the inside of the compressor can stably rotate without being influenced by the crossed inclined planes. The shell connecting piece 5 is arranged between the conical screw rotor 13 and the driving motor 14, and the rotor shell 12 and the motor shell 15 are separated, so that vibration transmission media of the compressor shell are added, the vibration effect of the compressor can be relieved, and the compressor is more stable.
Another embodiment of the present invention provides an assembling method of the coaxial conical screw compressor, including:
a first outer rotor bearing 25 and a first outer rotor bearing 26 for supporting the two ends of the outer rotor are arranged in the rotor shell 12, and the first outer rotor bearing 25 and the first outer rotor bearing 26 are fixed by a bearing seat which is processed on the inner wall of the rotor shell 12 by matching a first bearing groove 13a and a second bearing groove 13b which are processed on the outer walls of the two ends of the outer rotor;
a conical screw rotor 13 is arranged on the fixed outer rotor bearing;
connecting one side end face of the housing connecting piece 5 with one side end face of the rotor housing 12;
mounting a coupler 20 on the inner rotor shaft 16, and sleeving a connecting piece bearing 18 and a bearing retainer ring 19 on the coupler 20;
installing a hub type bearing seat 8 in the shell connecting piece 5, enabling a bearing installation cylinder 10 on the hub type bearing seat 8 to be sleeved on a connecting piece bearing 18, screwing the hub type bearing seat 8, and fixing the connecting piece bearing 18 through the bearing installation cylinder 10;
installing a driving motor 14, installing a motor rotor shaft 17 on the other side of the coupler 20 through the bearing installation cylinder 10, and then sleeving a motor installation shell 15 on the driving motor 14 to be connected with the end face of the other side of the shell connecting piece 5;
and an oil-gas separator 22 and an exhaust end cover 23 are sequentially arranged on the other end face of the rotor shell 12, and an air suction end cover 21 is arranged on the other end face of the motor mounting shell 15, so that the assembly process of the coaxial conical screw compressor is completed.
The shell connecting piece 5 between the motor part and the rotating part can solve the problem of non-parallel rotating shafts caused by the conical rotors, and ensures normal meshing transmission between the inner rotor and the outer rotor. Meanwhile, the hub-shaped bearing seat 8 is designed more conveniently, the problem that a bearing is difficult to mount due to the existence of an inclined plane in the conical screw compressor is solved, and the hub-shaped bearing seat can be used for an air suction channel, and the arrangement that the compressor sucks air to cool the motor through an air suction valve at the rear end of the motor is reserved.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. The utility model provides a coaxial awl helical-lobe compressor which characterized in that: the motor comprises a driving motor (14) arranged in a motor shell (15) and a conical screw rotor (13) arranged in a rotor shell (12), wherein the motor shell (15) is connected with one side end face of the rotor shell (12) through a shell connecting piece (5); the two end faces of the shell connecting piece (5) are mutually intersected, and the intersection angle of the surface normal is equal to the intersection angle of the axes of the inner rotor and the outer rotor of the conical screw rotor (13); a hub type bearing seat (8) is installed in the shell connecting piece (5), a bearing installation cylinder (10) is arranged on the hub type bearing seat (8), a connecting piece bearing (18) for supporting the inner rotor shaft (16) and the motor rotor shaft (17) and a coupler (20) for connecting the inner rotor shaft (16) and the motor rotor shaft (17) are arranged in the bearing installation cylinder (10); an outer rotor bearing for supporting the two ends of the outer rotor is arranged in the rotor shell (12); the other end face of the motor shell (15) is provided with an air suction end cover (21), the other end face of the rotor shell (12) is connected with an exhaust end cover (23) through an oil-gas separator (22), and the oil-gas separator (22) is communicated with an exhaust port of the conical screw rotor (13).
2. The coaxial cone screw compressor of claim 1, wherein: the motor shell (15) and the rotor shell (12) are connected through the shell connecting piece (5), one side end face is a circular face with the same radius, the axis of the shell connecting piece (5) is perpendicular to the rotating part mounting face (12a), the shell connecting piece (5) is formed to the motor part mounting face (15a) in a stretching mode from the rotating part mounting face (12a), the section size is two intersecting circles formed by connecting tangent lines, the radius of each intersecting circle is the same as that of the circular face of the shell connecting piece (5), the tangent length is equal to the distance d between the two centers, and the calculation expression is as follows:
Figure FDA0003568503590000011
in the formula I1Is the outer rotor axis length, /)2The inner rotor axis length.
3. The coaxial conical screw compressor according to claim 1 or 2, characterized in that: and two ends of the shell connecting piece (5) are connected with the end surfaces of the motor shell (15) and the rotor shell (12) through threads.
4. The coaxial conical screw compressor according to claim 1 or 2, characterized in that: rubber gaskets are arranged between the two ends of the shell connecting piece (5) and the end faces of the motor shell (15) and the rotor shell (12).
5. The coaxial cone screw compressor of claim 1, wherein: wheel hub type bearing frame (8) still include annular rim (9a) and a plurality of spoke (9b), bearing installation section of thick bamboo (10) set up the center at rim (9a), a plurality of spokes (9b) are connected between the outer wall of rim (9a) inboard and bearing installation section of thick bamboo (10), form suction channel (11) through the space between spoke (9b) and rim (9a) and the bearing installation section of thick bamboo (10).
6. The coaxial cone screw compressor of claim 5, wherein: an internal thread is processed on the end face of one side of the shell connecting piece (5) connected with the motor shell (15), and a matched external thread is processed on the periphery of the wheel rim (9 a).
7. The coaxial cone screw compressor of claim 5, wherein: a bearing retainer ring (19) is also arranged in the bearing mounting cylinder (10), the bearing retainer ring (19) is arranged between the two connecting piece bearings (18), and the connecting piece bearings (18) and the bearing retainer ring (19) which support the inner rotor shaft (16) and the motor rotor shaft (17) are sleeved on the coupler (20); a bearing mounting seat (16a) is arranged on the inner rotor shaft (16), the bottom of the bearing mounting cylinder (10) is a supporting seat (10b), and the inner wall of the bearing mounting cylinder (10) is a supporting wall (10 a); the connecting piece bearing (18) and the bearing retainer ring (19) are axially fixed with the bearing mounting seat (16a) through the supporting seat (10b) and radially fixed through the supporting wall (10 a).
8. The coaxial cone screw compressor of claim 1, wherein: bearing grooves are processed on the outer walls of the two ends of the outer rotor, and the outer rotor bearing is fixed through bearing blocks which are processed on the inner wall of the rotor shell (12) in a matching mode through the two bearing grooves.
9. The coaxial cone screw compressor of claim 1, wherein: an air inlet valve (24a) is arranged on the air suction end cover (21), and an exhaust valve (24c) is arranged on the exhaust end cover (23).
10. A method of assembling a coaxial cone screw compressor according to claim 1, comprising:
an outer rotor bearing for supporting the two ends of the outer rotor is arranged in the rotor shell (12);
a cone screw rotor (13) is arranged on the fixed outer rotor bearing;
connecting one side end face of the shell connecting piece (5) with one side end face of the rotor shell (12);
mounting a coupling (20) on the inner rotor shaft (16) and mounting a connector bearing (18) supporting the inner rotor shaft (16);
a hub type bearing seat (8) is arranged in the shell connecting piece (5), so that a bearing installation cylinder (10) on the hub type bearing seat (8) is sleeved on a connecting piece bearing (18), and the connecting piece bearing (18) is fixed;
installing a driving motor (14), mounting a motor rotor shaft (17) on the other side of the coupler (20) through the bearing mounting cylinder (10), and sleeving a motor mounting shell (15) on the driving motor (14) to be connected with the end face of the other side of the shell connecting piece (5);
an oil-gas separator (22) and an exhaust end cover (23) are sequentially arranged on the other end face of the rotor shell (12), and an air suction end cover (21) is arranged on the other end face of the motor mounting shell (15).
CN202210311439.0A 2022-03-28 2022-03-28 Coaxial conical screw compressor and assembly method thereof Active CN114623079B (en)

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JP2016138521A (en) * 2015-01-28 2016-08-04 ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド Screw compressor
CN209340001U (en) * 2017-09-21 2019-09-03 阿特拉斯·科普柯空气动力股份有限公司 Cylinder symmetric Stirling engine
CN113513476A (en) * 2021-07-12 2021-10-19 西安交通大学 Variable-pitch space internal-meshing conical double-screw compressor rotor and compressor
CN113530826A (en) * 2021-07-12 2021-10-22 西安交通大学 Multi-tooth space cycloid type inner meshing conical double-screw compressor rotor and compressor
CN114109833A (en) * 2021-12-30 2022-03-01 石家庄通安机械有限公司 Screw compressor
CN217501981U (en) * 2022-03-28 2022-09-27 西安交通大学 Coaxial cone screw compressor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201013589Y (en) * 2006-12-31 2008-01-30 西安交通大学 Conical double helical lobe compressor actuating devive
JP2016138521A (en) * 2015-01-28 2016-08-04 ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド Screw compressor
CN209340001U (en) * 2017-09-21 2019-09-03 阿特拉斯·科普柯空气动力股份有限公司 Cylinder symmetric Stirling engine
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