CN111350664B - Screw rotor set and hydrogen circulating pump with same - Google Patents

Screw rotor set and hydrogen circulating pump with same Download PDF

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Publication number
CN111350664B
CN111350664B CN202010098408.2A CN202010098408A CN111350664B CN 111350664 B CN111350664 B CN 111350664B CN 202010098408 A CN202010098408 A CN 202010098408A CN 111350664 B CN111350664 B CN 111350664B
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rotor
arc
coordinate
cycloid
radius
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CN111350664A (en
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周坤
卢阳
张炯焱
王立光
周武彬
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Ningbo Baosi Energy Equipment Co Ltd
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Ningbo Baosi Energy Equipment Co Ltd
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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
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • 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
    • 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
    • F04C2250/00—Geometry
    • F04C2250/20—Geometry of the rotor

Abstract

The invention discloses a screw rotor set and a hydrogen circulating pump, which comprise a driving rotor and a driven rotor, wherein the driving rotor is meshed with the driven rotor; the profile of the driven rotor is defined by line A1B1Transition arc B1C1Point meshing cycloid C1D1And root arc D1E1Composition is carried out; the line of the active rotor profile is conjugated with the envelope line A by a straight line2B2Circular arc conjugate envelope B2C2Point meshing cycloid C2D2And addendum arc D2E2Composition is carried out; the driven rotor molded line and the driving rotor molded line are centrosymmetric. The screw rotor set is simple in structure and convenient to process. The double-screw hydrogen circulating pump with the rotor has better air tightness and volume efficiency.

Description

Screw rotor set and hydrogen circulating pump with same
Technical Field
The invention belongs to the field of mechanical engineering design, and particularly relates to a screw rotor set and a hydrogen circulating pump with the same.
Background
The double-screw hydrogen circulating pump is an oil-free rotary machine for a hydrogen fuel cell, and has the advantages of simple and compact structure, stable operation, low mechanical vibration noise, easy maintenance and the like. With the increasing demand for energy and the worsening of environmental problems, hydrogen energy has been developed and popularized as a new energy source, and is applied to the industrial fields of airplanes, trains, automobiles, and the like. Hydrogen circulation pumps are an important component of electric vehicles, and the share of the screw machine market is increasing.
The screw rotor set is a core component in the double-screw hydrogen circulating pump. The screw rotor set comprises a pair of rotor sets which are meshed with each other and have opposite rotating directions, each rotor set comprises a driving rotor and a driven rotor, the driving rotor is connected with the motor, and the driving rotor drives the driven rotors to rotate in the air cylinder through a gear structure, so that the air suction and exhaust processes are completed. The rotor profile is the main factor affecting the performance of the circulation pump. The screw rotor set in the prior art is complex in structure, troublesome to machine and high in cost.
Disclosure of Invention
The invention aims to provide a screw rotor set which is simple in structure and convenient to process.
The technical scheme of the invention is that the screw rotor set with the following structure is provided, and comprises a driving rotor and a driven rotor, wherein the driving rotor and the driven rotor are meshed with each other; the profile of the driven rotor is defined by line A1B1Transition arc B1C1Point meshing cycloid C1D1And root arc D1E1Composition is carried out; the line of the active rotor profile is conjugated with the envelope line A by a straight line2B2Circular arc conjugate envelope B2C2Point meshing cycloid C2D2And addendum arc D2E2Composition is carried out; the driven rotor molded line and the driving rotor molded line are centrosymmetric.
After adopting the structure, compared with the prior art, the screw rotor set has the following advantages:
the profile of the driven rotor of the screw rotor set of the hydrogen circulating pump of the invention is formed by a straight line A1B1Transition arc B1C1Point meshing cycloid C1D1And root arc D1E1Composition is carried out; the profile of the active rotor is conjugated with an envelope line A by a straight line2B2Circular arc conjugate envelope B2C2Point meshing cycloid C2D2And addendum arc D2E2Composition is carried out; the molded lines of the driven rotor and the driving rotor form a simple curve, the two rotors are stacked about the center, no eccentric moment is generated during operation, the static balance and dynamic balance conditions are met, the molded lines are completely conjugated, and the meshing condition is met. The screw rotor set is simple to process and saves cost. Use of the device with the rotaryThe twin-screw hydrogen circulating pump has better air tightness and volume efficiency.
As an improvement, the driving rotor and the driven rotor have the same outer circle radius and inner circle radius, the outer circle radius is r1e, the inner circle radius is r1i, and the center distance is Ac; the transmission ratio is i, and the coordinates of the driven rotor are defined in a coordinate system O1X1Y1The active rotor is defined in a coordinate system O2X2Y2；
The line A of the profile of the driven rotor1B1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000021
where X011 denotes an X coordinate of a straight line, Y011 denotes a Y coordinate of a straight line, and t011 denotes a range of a straight line.
As an improvement, the transition circular arc B of the driven rotor profile1C1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000022
wherein X012 denotes an X coordinate of the arc, Y012 denotes a Y coordinate of the arc, and t012 denotes a rotation angle range of the arc; transition arc at B1The point is tangent to the straight line; the circle center of the transition arc is at the intersection point of the tooth bottom arc and the abscissa axis, and the radius is the radius of the tooth bottom arc.
As an improvement, the cycloid B of the driven rotor profile1C1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000023
wherein X013 denotes an X coordinate of the cycloid, Y013 denotes a Y coordinate of the cycloid, and t013 denotes a meshing rotation angle of the cycloid; cycloid at D1The point is tangent with the circular arc of the tooth bottom; the base radius of the cycloid curve isThe radius of a tooth root circle is r1i, the radius of a rolling circle is the radius of an addendum circle r1e, and the swing diameter is the center distance Ac; the meshing angle is obtained according to the cosine law.
As an improvement, the root arc D of the driven rotor profile1E1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000031
wherein X014 represents the X coordinate of the circular arc, Y014 represents the Y coordinate of the circular arc, and t014 represents the engagement angle range of the circular arc; the center of the tooth bottom arc is located at the origin of a coordinate system of the driven rotor, and the radius of the tooth bottom arc is r1 i; the meshing corner is a quarter of a circular arc.
As an improvement, the linear conjugate envelope line A of the active rotor profile2B2And solving a rectangular coordinate parameter equation according to the meshing condition as follows:
Figure BDA0002386036880000032
wherein X021 represents X indices of the envelope, Y021 represents Y coordinate of the envelope,
Figure BDA0002386036880000035
represents a meshing rotation angle, k ═ i + 1; the engagement conditions being non-linear equations, the corresponding t value being determined
Figure BDA0002386036880000036
Solving curve A by substituting equation2B2And (4) coordinates.
As an improvement, the circular arc conjugate envelope line B of the active rotor profile2C2And solving a rectangular coordinate parameter equation according to the meshing condition as follows:
Figure BDA0002386036880000033
as an improvement, the cycloid C of the active rotor profile is2D2The rectangular coordinate parameter equation of the cycloid is as follows:
Figure BDA0002386036880000034
wherein X023 represents an X coordinate of the cycloid, Y023 represents a Y coordinate of the cycloid, and t023 represents a meshing rotation angle of the cycloid; cycloid at C2Point and second curve B2C2Tangency; the radius of a base circle of the cycloid is the radius r1i of a root circle, the radius of a rolling circle is the radius r1e of an addendum circle, and the radius of the cycloid is the center distance Ac; the meshing angle is obtained according to the cosine law.
As an improvement, the tooth top arc D of the active rotor profile2E2The right angle parameter equation of the circular arc is as follows:
Figure BDA0002386036880000041
wherein X024 represents an X coordinate of a circular arc, Y024 represents a Y coordinate of the circular arc, and t024 represents a meshing angle range of the circular arc; the center of the tooth top arc is located at the origin of a coordinate system of the driven rotor, and the radius of the tooth top arc is the radius r1e of the tooth top arc; the meshing corner is a quarter of a circular arc.
Another technical problem to be solved by the present invention is to provide a hydrogen circulation pump, wherein the screw rotor set of the hydrogen circulation pump has a simple structure, is convenient to process, has high strength, good performance and long service life.
The technical solution of the present invention is to provide a hydrogen circulation pump having the following structure, including any one of the above-mentioned screw rotor sets.
After adopting the structure, compared with the prior art, the hydrogen circulating pump has the following advantages:
the profile of the driven rotor of the screw rotor set of the hydrogen circulating pump of the invention is formed by a straight line A1B1Transition arc B1C1Point meshing cycloid C1D1And root arc D1E1Composition is carried out; the profile of the active rotor is conjugated with an envelope line A by a straight line2B2Circular arc conjugate envelope B2C2Point meshing cycloid C2D2And addendum arc D2E2Composition is carried out; the molded lines of the driven rotor and the driving rotor form a simple curve, the two rotors are stacked about the center, no eccentric moment is generated during operation, the static balance and dynamic balance conditions are met, the molded lines are completely conjugated, and the meshing condition is met. The screw rotor set is simple to process and saves cost. The double-screw hydrogen circulating pump with the rotor has better air tightness and volume efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a profile of a screw rotor set according to the present invention.
Fig. 2 is a schematic structural diagram of a profile of a screw rotor set according to an embodiment of the present invention.
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.
The invention discloses a screw rotor set which comprises a driving rotor and a driven rotor, wherein the driving rotor and the driven rotor are meshed with each other.
As shown in fig. 1, the profile of the driven rotor is formed by a straight line a1B1Transition arc B1C1Point meshing cycloid C1D1And root arc D1E1And (4) forming. The profile of the active rotor is conjugated with an envelope line A by a straight line2B2Circular arc conjugate envelope B2C2Point meshing cycloid C2D2And addendum arc D2E2And (4) forming. The driven rotor molded line and the driving rotor molded line are centrosymmetric.
The driving rotor and the driven rotor have the same outer circle radius and inner circle radius, the outer circle radius is r1e, and the inner circle radius is larger than the outer circle radiusThe circle radius is r1i, and the center-to-center distance is Ac. The transmission ratio is i, and the coordinates of the driven rotor are defined in a coordinate system O1X1Y1The active rotor is defined in a coordinate system O2X2Y2. In this embodiment, the addendum arc diameter r1e is 40mm, the dedendum arc diameter r1i is 20mm, the center-to-center distance Ac is 60mm, and the equation of each section of the molded line is as follows, as shown in fig. 2.
The composition curve of the driven rotor is as follows:
straight line A1B1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000051
transition arc B1C1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000052
cycloid C1D1The rectangular coordinate parameter equation is:
Figure BDA0002386036880000053
circular arc of tooth bottom D1E1The right angle parametric equation is:
Figure BDA0002386036880000061
the composition curve of the driving rotor is as follows:
first section curve A2B2The right angle parametric equation is:
Figure BDA0002386036880000062
second curve B2C2The right angle parameter equation is
Figure BDA0002386036880000063
Third section curve C2D2The right angle parametric equation is:
Figure BDA0002386036880000064
fourth curve D2E2The right angle parametric equation is:
Figure BDA0002386036880000065
the above is introduced by the curve composition of the profile of the driving rotor and the profile of the driven rotor, the profiles need to be connected into a complete profile by rotating a certain angle, and after one half of the profile is obtained, the other half of the profile is obtained by rotating.
The invention also discloses a hydrogen circulating pump which comprises the screw rotor set with the structure.

Claims (10)

1. A screw rotor set comprises a driving rotor and a driven rotor, wherein the driving rotor is meshed with the driven rotor; the method is characterized in that: the profile of the driven rotor is defined by line A1B1Transition arc B1C1Point meshing cycloid C1D1And root arc D1E1Composition is carried out; the line of the active rotor profile is conjugated with the envelope line A by a straight line2B2Circular arc conjugate envelope B2C2Point meshing cycloid C2D2And addendum arc D2E2Composition is carried out; the driven rotor molded line and the driving rotor molded line are centrosymmetric.
2. The screw rotor set of claim 1, wherein: the driving rotor and the driven rotor have the same outer circle radius and inner circle halfThe radius of the outer circle is r1e, the radius of the inner circle is r1i, and the center distance is Ac; the transmission ratio is i, and the coordinates of the driven rotor are defined in a coordinate system O1X1Y1The active rotor is defined in a coordinate system O2X2Y2(ii) a The line A of the profile of the driven rotor1B1The rectangular coordinate parameter equation is:
Figure DEST_PATH_IMAGE001
where X011 denotes an X coordinate of a straight line, Y011 denotes a Y coordinate of a straight line, and t011 denotes a range of a straight line.
3. The screw rotor set of claim 2, wherein: the transition circular arc B of the profile of the driven rotor1C1The rectangular coordinate parameter equation is:
Figure 348889DEST_PATH_IMAGE002
wherein X012 denotes an X coordinate of the arc, Y012 denotes a Y coordinate of the arc, and t012 denotes a rotation angle range of the arc; transition arc at B1The point is tangent to the straight line; the circle center of the transition arc is at the intersection point of the tooth bottom arc and the abscissa axis, and the radius is the radius of the tooth bottom arc.
4. The screw rotor set of claim 2, wherein: the point meshing cycloid C of the driven rotor molded line1D1The rectangular coordinate parameter equation is:
Figure DEST_PATH_IMAGE003
wherein X013 denotes an X coordinate of the cycloid, Y013 denotes a Y coordinate of the cycloid, and t013 denotes a meshing rotation angle of the cycloid; cycloid at D1The point is tangent with the circular arc of the tooth bottom; the radius of the base circle of the cycloid is the root circleRadius r1i, the radius of the rolling circle is addendum circle radius r1e, and the swing diameter is center distance Ac; the meshing angle is obtained according to the cosine law.
5. The screw rotor set of claim 2, wherein: the tooth root circular arc D of the driven rotor molded line1E1The rectangular coordinate parameter equation is:
Figure 266029DEST_PATH_IMAGE004
wherein X014 represents the X coordinate of the circular arc, Y014 represents the Y coordinate of the circular arc, and t014 represents the engagement angle range of the circular arc; the center of the tooth bottom arc is located at the origin of a coordinate system of the driven rotor, and the radius of the tooth bottom arc is r1 i; the meshing corner is a quarter of a circular arc.
6. A screw rotor set according to claim 3, wherein: the linear conjugate envelope line A of the profile of the active rotor2B2And solving a rectangular coordinate parameter equation according to the meshing condition as follows:
Figure DEST_PATH_IMAGE005
wherein X021 represents an X coordinate of the envelope, Y021 represents a Y coordinate of the envelope, which represents the meshing rotation angle, and k = i + 1; the engagement conditions being non-linear equations, the corresponding t value being determined
Figure 249029DEST_PATH_IMAGE006
Solving curve A by substituting equation2B2And (4) coordinates.
7. The screw rotor set of claim 4, wherein: the arc conjugate envelope line B of the profile of the active rotor2C2And solving a rectangular coordinate parameter equation according to the meshing condition as follows:
Figure DEST_PATH_IMAGE007
8. the screw rotor set of claim 5, wherein: the point meshing cycloid C of the active rotor molded line2D2The rectangular coordinate parameter equation of the cycloid is as follows:
Figure 644238DEST_PATH_IMAGE008
wherein X023 represents an X coordinate of the cycloid, Y023 represents a Y coordinate of the cycloid, and t023 represents a meshing rotation angle of the cycloid; cycloid at C2Point and second curve B2C2Tangency; the radius of a base circle of the cycloid is the radius r1i of a root circle, the radius of a rolling circle is the radius r1e of an addendum circle, and the radius of the cycloid is the center distance Ac; the meshing angle is obtained according to the cosine law.
9. The screw rotor set of claim 6, wherein: the addendum arc D of the active rotor profile2E2The right angle parameter equation of the circular arc is as follows:
Figure DEST_PATH_IMAGE009
wherein X024 represents an X coordinate of a circular arc, Y024 represents a Y coordinate of the circular arc, and t024 represents a meshing angle range of the circular arc; the center of the tooth top arc is located at the origin of a coordinate system of the driven rotor, and the radius of the tooth top arc is the radius r1e of the tooth top arc; the meshing corner is a quarter of a circular arc.
10. A hydrogen circulation pump characterized by: comprising a screw rotor set according to any one of claims 1 to 9.
CN202010098408.2A 2020-02-18 2020-02-18 Screw rotor set and hydrogen circulating pump with same Active CN111350664B (en)

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CN111828327B (en) * 2020-07-15 2021-11-30 高秀峰 Multi-tooth rotor compressor rotor molded line, multi-tooth rotor and compressor
CN111878397B (en) * 2020-09-28 2021-02-19 宁波鲍斯能源装备股份有限公司 Air compressor and expander of variable pitch screw rod
CN114607603B (en) * 2020-12-09 2023-07-11 东北大学 Design method of screw vacuum dry pump rotor
CN115289017A (en) * 2022-08-30 2022-11-04 山东亿宁环保科技有限公司 Multi-claw rotor with same shape

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