CN112983811A - Double-drive two-stage variable-pitch screw main machine, air compressor, vacuum pump and expansion machine - Google Patents

Double-drive two-stage variable-pitch screw main machine, air compressor, vacuum pump and expansion machine Download PDF

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Publication number
CN112983811A
CN112983811A CN202110224993.0A CN202110224993A CN112983811A CN 112983811 A CN112983811 A CN 112983811A CN 202110224993 A CN202110224993 A CN 202110224993A CN 112983811 A CN112983811 A CN 112983811A
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China
Prior art keywords
stage
rotor
primary
male
female
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Pending
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CN202110224993.0A
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Chinese (zh)
Inventor
周坤
王立光
马升
庄博
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Ningbo Baosi Energy Equipment Co Ltd
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Ningbo Baosi Energy Equipment Co Ltd
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Priority to CN202110224993.0A priority Critical patent/CN112983811A/en
Publication of CN112983811A publication Critical patent/CN112983811A/en
Pending legal-status Critical Current

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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
    • F04C18/12—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 other than internal-axis type
    • F04C18/14—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 other than internal-axis type with toothed rotary pistons
    • F04C18/16—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 other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
    • F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C11/00—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type
    • F01C11/002—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • 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
    • F04C23/001—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 of similar working principle
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors

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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 double-drive double-stage variable pitch screw main machine, an air compressor, a vacuum pump and an expansion machine, wherein the double-drive double-stage variable pitch screw main machine comprises a primary main machine and a secondary main machine which are connected in series and communicated, the primary main machine comprises a primary driving source and a primary rotor set driven by the primary driving source, the secondary main machine comprises a secondary driving source and a secondary rotor set driven by the secondary driving source, and a male rotor and a female rotor of the primary rotor set and/or a male rotor and a female rotor of the secondary rotor set are variable pitch screws. The volume of the medium cavity of the first-stage rotor set and/or the volume of the medium cavity of the second-stage rotor set are gradually reduced or increased by adopting the variable-pitch screw, the female rotor of the first-stage rotor set and/or the female rotor of the second-stage rotor set have the process of internal compression or internal expansion in the process of mutual meshing, the compression ratio or the expansion ratio can be improved, the pressurization or expansion process of a gas medium can be stable, the compression or expansion power consumption is reduced, and the safety and reliability of a host machine are improved.

Description

Double-drive two-stage variable-pitch screw main machine, air compressor, vacuum pump and expansion machine
Technical Field
The invention relates to the technical field of air compression or expansion, in particular to a double-drive two-stage variable-pitch screw main machine, an air compressor, a vacuum pump and an expander.
Background
In the field of rotary air compressors or expanders, a double-screw rotor is usually adopted to form a periodically-changed working cavity volume in the rotary motion, so that the processes of entering, compressing/expanding and discharging a working medium are realized, the air compressor converts the mechanical energy of a power system into gas pressure energy, and the expander converts the internal energy of the working medium into mechanical energy.
At present, in the industry of air compressors, in order to increase the compression capacity, a two-stage screw main machine is being more and more widely applied, the two-stage screw main machine is provided with a two-stage rotor set, the two-stage screw main machine comprises a set of low-pressure rotor set and a set of high-pressure rotor set which are horizontally distributed, the low-pressure rotor set and the high-pressure rotor set are horizontally distributed, gas enters the high-pressure rotor set after being subjected to one-stage compression by the low-pressure rotor set, and is discharged after being subjected to two-stage compression by the. Because the gas volume is reduced after the gas is compressed by the low-pressure rotor set in one stage, the size of the rotor in the high-pressure rotor set is usually smaller than that of the rotor in the low-pressure rotor set; meanwhile, in order to satisfy the air quantity relation, the size of the main engine on the low-pressure rotor set side is larger than that of the main engine on the high-pressure rotor set side.
In the field of expansion machines, in order to realize a large expansion ratio and increase the output power of the expansion machine, a two-stage screw main machine is also often adopted, the two-stage screw main machine comprises a first-stage rotor set and a second-stage rotor set which are horizontally distributed, gas enters the second-stage rotor set after being subjected to first-stage expansion by the first-stage rotor set, and then is subjected to second-stage expansion by the second-stage rotor set. Because the volume of the gas is increased after the gas is expanded by the first-stage rotor set, the size of the rotor of the second-stage rotor set is generally larger than that of the rotor of the first-stage rotor set; meanwhile, in order to satisfy the air quantity relation, the size of the main engine on the side of the primary rotor set is smaller than that of the main engine on the side of the secondary rotor set.
The larger size of the main machine has the defect of insufficient space utilization of the main machine, and if a larger compression ratio or expansion ratio can be realized in the main machine with the same size, the influence caused by the defect can be compensated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-drive two-stage variable-pitch screw main machine which can realize a larger compression ratio or expansion ratio in the main machines with the same size.
The technical scheme includes that the system comprises a primary host and a secondary host which are connected in series and communicated with each other, wherein the primary host comprises a primary driving source and a primary rotor set driven by the primary driving source, the primary rotor set comprises a primary male rotor and a primary female rotor which are meshed with each other, the secondary host comprises a secondary driving source and a secondary rotor set driven by the secondary driving source, the secondary rotor set comprises a secondary male rotor and a secondary female rotor which are meshed with each other, the primary male rotor and the primary female rotor are variable-pitch screws, and the secondary male rotor and the secondary female rotor are uniform-pitch screws or variable-pitch screws; or the first-stage male rotor and the first-stage female rotor are both equal-pitch screws, and the second-stage male rotor and the second-stage female rotor are both variable-pitch screws.
Compared with the prior art, the double-drive two-stage variable-pitch screw host has the following advantages: the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set are variable-pitch screws, the volumes of the medium cavities of the primary rotor set and/or the secondary rotor set are gradually reduced or increased, and the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set have an internal compression or internal expansion process in the mutual meshing process, so that the compression ratio or expansion ratio can be improved, the pressurization or expansion process of a gas medium can be stable, the compression or expansion power consumption is reduced, and the safety and reliability of a host machine are improved; the primary rotor set and the secondary rotor set are connected in series and communicated and are driven by respective driving sources to operate, gear transmission is avoided, noise can be reduced, and manufacturing and assembling efficiency of the double-drive double-stage variable-pitch screw main machine can be improved.
Preferably, the first-stage male rotor and the first-stage female rotor are variable-pitch screws and are formed by connecting a plurality of sections of screws with different pitches end to end. By adopting the structure, the first-stage male rotor and the first-stage female rotor are both multi-section variable-pitch screws.
Preferably, the first-stage male rotor and the first-stage female rotor are variable-pitch screws and are composed of screws with gradually-changed pitches. By adopting the structure, the first-stage male rotor and the first-stage female rotor are both of a gradually-changed variable-pitch screw.
Preferably, the second-stage male rotor and the second-stage female rotor are variable-pitch screws and are formed by connecting a plurality of sections of screws with different pitches end to end. By adopting the structure, the secondary male rotor and the secondary female rotor are both multi-section variable-pitch screws.
Preferably, the secondary male rotor and the secondary female rotor are both variable-pitch screws and are both composed of screws with gradually-changed pitches. By adopting the structure, the secondary male rotor and the secondary female rotor are both of a gradually-changed variable-pitch screw.
Preferably, the primary male rotor is connected with the primary driving source and driven by the primary driving source to rotate, the secondary male rotor is connected with the secondary driving source and driven by the secondary driving source to rotate, the primary male rotor is in meshing transmission with the primary female rotor, and the secondary male rotor is in meshing transmission with the secondary female rotor. By adopting the structure, the structure is simple, and the volume of the main machine can be reduced by adopting meshing transmission between the male rotor and the female rotor; the first-stage male rotor and the second-stage male rotor are respectively connected with respective driving sources, gear transmission is avoided, the running reliability of the first male rotor and the second male rotor can be improved, and noise is reduced.
Preferably, the primary driving source is a primary motor, the secondary driving source is a secondary motor, the primary motor is arranged at the air suction end of the primary main machine, the secondary motor is arranged at the air discharge end of the secondary main machine, and the air discharge end of the primary main machine is horizontally communicated with the air suction end of the secondary main machine. By adopting the structure, the transmission reliability of the first male rotor by the first-stage motor and the transmission reliability of the second male rotor by the second-stage motor can be improved, the gear transmission is avoided, the noise is reduced, the communication part of the first-stage main machine and the second-stage main machine is prevented from being S-shaped, the gas circulation efficiency can be improved, the pressure loss of gas is reduced, and the manufacturing and assembling efficiency of the double-drive double-stage variable pitch screw main machine is improved.
The invention aims to solve the technical problem of providing an air compressor which can realize a larger compression ratio in a main machine with the same size and improve the compression efficiency.
The technical scheme includes that the air compressor comprises an air suction port, an air exhaust port and the double-drive two-stage variable-pitch screw main machine, wherein the air suction port is arranged at the air suction end of the first-stage rotor set, the air exhaust end of the first-stage rotor set is communicated with the air suction end of the second-stage rotor set, the air exhaust port is arranged at the air exhaust end of the second-stage rotor set, and the sizes of the first-stage male rotor and the first-stage female rotor are larger than those of the second-stage male rotor and the second-stage female rotor.
Compared with the prior art, the air compressor has the following advantages: the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set are variable-pitch screws, the volumes of the medium cavities of the primary rotor set and/or the secondary rotor set are gradually reduced, and the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set have an internal compression process in the mutual meshing process, so that the compression ratio can be improved, the pressurization process of a gas medium can be stable, the power consumption of an air compressor is reduced, and the safety and reliability of a host machine are improved; the first-stage rotor set and the second-stage rotor set are driven by the driving source to operate, so that the operation reliability of the first-stage rotor set and the second-stage rotor set can be improved; the primary rotor set and the secondary rotor set are connected in series and communicated and are driven by respective driving sources to operate, gear transmission is avoided, noise can be reduced, and manufacturing and assembling efficiency of the double-drive double-stage variable-pitch screw main machine can be improved.
The invention aims to solve the technical problem of providing a vacuum pump which can realize a larger compression ratio in a host machine with the same size and improve the vacuum extraction efficiency.
The technical scheme includes that the vacuum pump comprises an air suction port, an air exhaust port and the double-drive two-stage variable-pitch screw main machine, wherein the air suction port is arranged at the air suction end of a first-stage rotor set, the air exhaust end of the first-stage rotor set is communicated with the air suction end of a second-stage rotor set, the air exhaust port is arranged at the air exhaust end of the second-stage rotor set, and the sizes of the first-stage male rotor and the first-stage female rotor are larger than those of the second-stage male rotor and the second-stage female rotor.
Compared with the prior art, the vacuum pump has the following advantages: the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set are variable-pitch screws, the volumes of the medium cavities of the primary rotor set and/or the secondary rotor set are gradually reduced, and the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set have an internal compression process in the mutual meshing process, so that the compression ratio can be improved, the vacuum extraction efficiency of a vacuum pump can be improved, the vacuum extraction process of the vacuum pump can be stable, the power consumption of the vacuum pump for pumping is reduced, and the safety and reliability of a host machine are improved; the first-stage rotor set and the second-stage rotor set are driven by the driving source to operate, so that the operation reliability of the first-stage rotor set and the second-stage rotor set can be improved; the primary rotor set and the secondary rotor set are connected in series and communicated and are driven by respective driving sources to operate, gear transmission is avoided, noise can be reduced, and manufacturing and assembling efficiency of the double-drive double-stage variable-pitch screw main machine can be improved.
The invention aims to provide an expansion machine which can realize a larger expansion ratio in a main machine with the same size.
The technical scheme of the invention is that the expander comprises an air suction port, an air exhaust port and the double-drive two-stage variable-pitch screw main engine, wherein the air suction port is arranged at the air suction end of a first-stage rotor set, the air exhaust end of the first-stage rotor set is communicated with the air suction end of a second-stage rotor set, the air exhaust port is arranged at the air exhaust end of the second-stage rotor set, and the sizes of a first-stage male rotor and a first-stage female rotor are smaller than those of a second-stage male rotor and a second-stage female rotor.
Compared with the prior art, the expander has the following advantages: the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set are variable-pitch screws, the volumes of the medium cavities of the primary rotor set and/or the secondary rotor set are gradually increased, and the male and female rotors of the primary rotor set and/or the male and female rotors of the secondary rotor set have an internal expansion process in the mutual meshing process, so that the expansion ratio can be improved, the working efficiency of the expander is improved, the expansion process of a gas medium can be stable, the power consumption of the expander is reduced, and the safety and reliability of a host machine are improved; the first-stage rotor set and the second-stage rotor set are driven by the driving source to operate, so that the operation reliability of the first-stage rotor set and the second-stage rotor set can be improved; the primary rotor set and the secondary rotor set are connected in series and communicated and are driven by respective driving sources to operate, gear transmission is avoided, noise can be reduced, and manufacturing and assembling efficiency of the double-drive double-stage variable-pitch screw main machine can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a dual-drive dual-stage variable pitch screw main unit according to the present invention.
FIG. 2 is a schematic structural view of a variable pitch screw in which both the first-stage male rotor and the first-stage female rotor are multi-stage.
As shown in the figure: 1. the rotor comprises a first-stage male rotor, a second-stage female rotor, a first-stage male rotor, a second-stage female rotor, a first-stage motor and a second-stage motor, wherein the first-stage male rotor is 2, the first-stage female rotor is 3, the second-stage male rotor is 4, the second-stage female.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.
In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Further, when a statement such as "… at least one" appears after the list of listed features, the entire listed feature is modified rather than modifying individual elements in the list.
Example 1:
as shown in fig. 1, the dual-drive dual-stage variable pitch screw host comprises a primary motor 5, a secondary motor 6, a primary rotor set consisting of a primary male rotor 1 and a primary female rotor 2 which are meshed with each other, and a secondary rotor set consisting of a secondary male rotor 3 and a secondary female rotor 4 which are meshed with each other, wherein the primary motor 5 and the primary rotor set form the primary host, the secondary motor 6 and the secondary rotor set form the secondary host, the primary motor 5 is arranged at the air suction end of the primary host, the secondary motor 6 is arranged at the air exhaust end of the secondary host, and the air exhaust end of the primary host is horizontally communicated with the air suction end of the secondary host. The first-stage male rotor 1 and the first-stage female rotor 2 are variable-pitch screws, and the axes of the first-stage male rotor and the second-stage female rotor are parallel to each other, and the second-stage male rotor 3 and the second-stage female rotor 4 are also variable-pitch screws, and the axes of the second-stage male rotor and the second-stage female rotor are parallel to each. One end of the first-stage male rotor 1 is connected with an output rotating shaft of the first-stage motor 5 and is driven by the first-stage motor 5 to rotate, and the first-stage male rotor 1 is in meshing transmission with the first-stage female rotor 2; one end of the second-stage male rotor 3 is connected with an output rotating shaft of the second-stage motor 6 and is driven by the second-stage motor 6 to rotate, and the second-stage male rotor 3 is in meshing transmission with the second-stage female rotor 4. The primary male rotor 1 can also drive the secondary male rotor 3 through a drive belt. The first-stage male rotor 1 and the first-stage female rotor 2 can be multi-section variable-pitch screws, namely, the screws with different pitches are connected end to form the variable-pitch rotor, as shown in fig. 2; the first-stage male rotor 1 and the first-stage female rotor 2 may be a tapered variable-pitch screw, that is, a screw whose pitch changes gradually. Similarly, the secondary male rotor 3 and the secondary female rotor 4 may be a multi-stage variable pitch screw or a progressive variable pitch screw.
Example 2:
the difference between this embodiment and embodiment 1 is that the first-stage male rotor 1 and the first-stage female rotor 2 are both equal-pitch screws, and the second-stage male rotor 3 and the second-stage female rotor 4 are multi-stage variable-pitch screws or gradual variable-pitch screws.
Example 3:
the present embodiment is different from embodiment 1 in that the first-stage male rotor 1 and the first-stage female rotor 2 are multi-stage variable pitch screws or gradual variable pitch screws, and the second-stage male rotor 3 and the second-stage female rotor 4 are constant pitch screws.
Example 4:
the air compressor comprises a shell, wherein a primary compression cavity, a secondary compression cavity and a double-drive two-stage variable-pitch screw main machine as in any one of embodiments 1 to 3 are arranged in the shell, an exhaust end of the primary compression cavity is horizontally communicated with an air suction end of the secondary compression cavity, a primary male rotor 1 and a primary female rotor 2 are arranged in the primary compression cavity, a secondary male rotor 3 and a secondary female rotor 4 are arranged in the secondary compression cavity, one end of the primary male rotor 1, which is positioned at the air suction end of the primary compression cavity, is connected with an output rotating shaft of a primary motor 5, one end of the secondary male rotor 3, which is positioned at the exhaust end of the secondary compression cavity, is connected with an output rotating shaft of a secondary motor 6, the primary motor 5 drives the primary male rotor 1 to rotate, the secondary motor 6 drives the secondary male rotor 3 to rotate, the primary male rotor 1 is in meshing transmission with the primary female rotor 2, and the.
The first-stage male rotor 1 and the first-stage female rotor 2 are variable-pitch screws with gradually reduced pitches, and the second-stage male rotor 3 and the second-stage female rotor 4 are equal-pitch screws; or the first-stage male rotor 1 and the first-stage female rotor 2 are equal-pitch screws, and the second-stage male rotor 3 and the second-stage female rotor 4 are variable-pitch screws with gradually reduced pitches; or the first-stage male rotor 1 and the first-stage female rotor 2, and the second-stage male rotor 3 and the second-stage female rotor 4 are variable-pitch screws with gradually reduced pitches. The shell is provided with an air suction port corresponding to the air suction end of the first-stage compression cavity, the shell is provided with an air exhaust port corresponding to the air exhaust end of the second-stage compression cavity, and the sizes of the first-stage male rotor 1 and the first-stage female rotor 2 are larger than those of the second-stage male rotor 3 and the second-stage female rotor 4.
Example 5:
the vacuum pump comprises a shell, wherein a first-stage air exhaust cavity, a second-stage air exhaust cavity and a double-drive two-stage variable-pitch screw host machine as in any one of embodiments 1 to 3 are arranged in the shell, an air exhaust end of the first-stage air exhaust cavity is horizontally communicated with an air suction end of the second-stage air exhaust cavity, a first-stage male rotor 1 and a first-stage female rotor 2 are arranged in the first-stage air exhaust cavity, a second-stage male rotor 3 and a second-stage female rotor 4 are arranged in the second-stage air exhaust cavity, one end, located at the air suction end of the first-stage air exhaust cavity, of the first-stage male rotor 1 is connected with an output rotating shaft of a first-stage motor 5, one end, located at the air exhaust end of the second-stage air exhaust cavity, of the second-stage male rotor 3 is connected with an output rotating shaft of a second-stage motor 6, the first-stage motor 5.
The first-stage male rotor 1 and the first-stage female rotor 2 are variable-pitch screws with gradually reduced pitches, and the second-stage male rotor 3 and the second-stage female rotor 4 are equal-pitch screws; or the first-stage male rotor 1 and the first-stage female rotor 2 are equal-pitch screws, and the second-stage male rotor 3 and the second-stage female rotor 4 are variable-pitch screws with gradually reduced pitches; or the first-stage male rotor 1 and the first-stage female rotor 2, and the second-stage male rotor 3 and the second-stage female rotor 4 are variable-pitch screws with gradually reduced pitches. An air suction port is arranged on the shell corresponding to the air suction end of the first-stage air suction cavity, an air exhaust port is arranged on the shell corresponding to the air exhaust end of the second-stage air suction cavity, and the sizes of the first-stage male rotor 1 and the first-stage female rotor 2 are larger than those of the second-stage male rotor 3 and the second-stage female rotor 4.
Example 6:
the expander comprises a shell, wherein a primary expansion cavity, a secondary expansion cavity and a double-drive two-stage variable-pitch screw host machine as in any one of embodiments 1 to 3 are arranged in the shell, an exhaust end of the primary expansion cavity is horizontally communicated with a suction end of the secondary expansion cavity, a primary male rotor 1 and a primary female rotor 2 are arranged in the primary expansion cavity, a secondary male rotor 3 and a secondary female rotor 4 are arranged in the secondary expansion cavity, one end of the primary male rotor 1, which is positioned at the suction end of the primary expansion cavity, is connected with an output rotating shaft of a primary motor 5, one end of the secondary male rotor 3, which is positioned at the exhaust end of the secondary expansion cavity, is connected with an output rotating shaft of a secondary motor 6, the primary motor 5 drives the primary male rotor 1 to rotate, the secondary motor 6 drives the secondary male rotor 3 to rotate, the primary male rotor 1 is in meshing transmission with the primary female rotor 2, and the secondary male rotor 3.
The first-stage male rotor 1 and the first-stage female rotor 2 are variable-pitch screws with gradually increasing pitches, and the second-stage male rotor 3 and the second-stage female rotor 4 are constant-pitch screws; or the first-stage male rotor 1 and the first-stage female rotor 2 are equal-pitch screws, and the second-stage male rotor 3 and the second-stage female rotor 4 are variable-pitch screws with gradually increasing pitches; or the first-stage male rotor 1 and the first-stage female rotor 2, and the second-stage male rotor 3 and the second-stage female rotor 4 are variable-pitch screws with gradually increasing pitches. The shell is provided with an air suction port corresponding to the air suction end of the first-stage expansion cavity, the shell is provided with an air exhaust port corresponding to the air exhaust end of the second-stage expansion cavity, and the sizes of the first-stage male rotor 1 and the first-stage female rotor 2 are smaller than those of the second-stage male rotor 3 and the second-stage female rotor 4.
The above are merely specific examples of the present invention, and are not intended to limit the scope of the invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.

Claims (10)

1. The double-drive double-stage variable-pitch screw host is characterized by comprising a primary host and a secondary host which are connected in series and communicated with each other, wherein the primary host comprises a primary driving source and a primary rotor set driven by the primary driving source, the primary rotor set comprises a primary male rotor and a primary female rotor which are meshed with each other, the secondary host comprises a secondary driving source and a secondary rotor set driven by the secondary driving source, the secondary rotor set comprises a secondary male rotor and a secondary female rotor which are meshed with each other, the primary male rotor and the primary female rotor are variable-pitch screws, and the secondary male rotor and the secondary female rotor are uniform-pitch screws or variable-pitch screws; or the first-stage male rotor and the first-stage female rotor are both equal-pitch screws, and the second-stage male rotor and the second-stage female rotor are both variable-pitch screws.
2. The dual-drive dual-stage variable pitch screw host machine according to claim 1, wherein the primary male rotor and the primary female rotor are variable pitch screws and are formed by connecting a plurality of sections of screws with different pitches end to end.
3. The dual-drive dual-stage variable pitch screw host machine according to claim 1, wherein the primary male rotor and the primary female rotor are variable pitch screws and are each composed of screws with gradually changing pitches.
4. The dual-drive dual-stage variable pitch screw host machine according to claim 1, wherein the secondary male rotor and the secondary female rotor are variable pitch screws and are formed by connecting a plurality of sections of screws with different pitches end to end.
5. The dual-drive dual-stage variable pitch screw host machine according to claim 1, wherein the secondary male rotor and the secondary female rotor are variable pitch screws and are each composed of screws with gradually changing pitches.
6. The dual-drive dual-stage variable pitch screw host machine according to any one of claims 1 to 5, wherein the primary male rotor is connected to and driven to rotate by the primary drive source, the secondary male rotor is connected to and driven to rotate by the secondary drive source, the primary male rotor is in mesh transmission with the primary female rotor, and the secondary male rotor is in mesh transmission with the secondary female rotor.
7. The dual-drive dual-stage variable pitch screw host machine according to claim 6, wherein the primary drive source is a primary motor, the secondary drive source is a secondary motor, the primary motor is disposed at a suction end of the primary host machine, the secondary motor is disposed at a discharge end of the secondary host machine, and the discharge end of the primary host machine is horizontally communicated with the suction end of the secondary host machine.
8. An air compressor, characterized in that, including the suction port, the exhaust port and according to claim 6 or 7 said double-drive two-stage variable pitch screw host, said suction port is set up in the suction end of the first-stage rotor group, the exhaust end of the first-stage rotor group communicates with the suction end of the second-stage rotor group, said exhaust port is set up in the exhaust end of the second-stage rotor group, the size of the first-stage male rotor and the first-stage female rotor is greater than the size of the second-stage male rotor and the second-stage female rotor.
9. A vacuum pump, characterized by comprising a suction port, an exhaust port and a double-drive double-stage variable pitch screw main unit according to claim 6 or 7, wherein the suction port is arranged at the suction end of a first-stage rotor set, the exhaust end of the first-stage rotor set is communicated with the suction end of a second-stage rotor set, the exhaust port is arranged at the exhaust end of the second-stage rotor set, and the size of a first-stage male rotor and the size of a first-stage female rotor are larger than that of a second-stage male rotor and a second-stage female rotor.
10. An expander, comprising a suction port, an exhaust port and a double-drive two-stage variable pitch screw main unit according to claim 6 or 7, wherein the suction port is arranged at the suction end of the first-stage rotor set, the exhaust end of the first-stage rotor set is communicated with the suction end of the second-stage rotor set, the exhaust port is arranged at the exhaust end of the second-stage rotor set, and the size of the first-stage male rotor and the size of the first-stage female rotor are smaller than that of the second-stage male rotor and the size of the second-stage female rotor.
CN202110224993.0A 2021-03-01 2021-03-01 Double-drive two-stage variable-pitch screw main machine, air compressor, vacuum pump and expansion machine Pending CN112983811A (en)

Priority Applications (1)

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CN202110224993.0A CN112983811A (en) 2021-03-01 2021-03-01 Double-drive two-stage variable-pitch screw main machine, air compressor, vacuum pump and expansion machine

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Application Number Priority Date Filing Date Title
CN202110224993.0A CN112983811A (en) 2021-03-01 2021-03-01 Double-drive two-stage variable-pitch screw main machine, air compressor, vacuum pump and expansion machine

Publications (1)

Publication Number Publication Date
CN112983811A true CN112983811A (en) 2021-06-18

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Country Status (1)

Country Link
CN (1) CN112983811A (en)

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