CN210218091U - Gear rotor of gear pump - Google Patents
Gear rotor of gear pump Download PDFInfo
- Publication number
- CN210218091U CN210218091U CN201921171076.5U CN201921171076U CN210218091U CN 210218091 U CN210218091 U CN 210218091U CN 201921171076 U CN201921171076 U CN 201921171076U CN 210218091 U CN210218091 U CN 210218091U
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- Prior art keywords
- gear rotor
- arc
- face
- molded line
- gear
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Abstract
The utility model discloses a gear rotor of a combined gear pump, which consists of a pair of left gear rotor (1) and a right gear rotor (2) which can be meshed with each other; the gear rotor comprises 6-12 teeth; the left end profile (101) consists of 4 curves: 2 sections of circular arcs, 1 section of transition curves and 1 section of conjugate curves; the right end face profile (201) consists of 4 curves: 2 sections of circular arcs, 1 section of transition curves and 1 section of conjugate curves. The gear rotor of the gear pump is simple in composition line and convenient to optimize, the left gear rotor (1) and the right gear rotor (2) can be completely and correctly meshed, leakage of fluid from a high-pressure cavity to a low-pressure cavity can be effectively reduced in the working process, the reduction process of closed volume is not generated, and the phenomenon of fluid trapping is avoided.
Description
Technical Field
The utility model relates to a positive displacement rotary pump, especially a gear rotor of gear pump.
Background
A gear rotor of a gear pump mainly comprises a left gear rotor (1) and a right gear rotor (2), and the working principle of the gear pump is that the left gear rotor (1) and the right gear rotor (2) are two gear rotors which are meshed with each other, when a gear rotates, liquid enters the interior of a pump body from an inlet and is conveyed to an outlet through the surface of the gear, and in the rotating working process of the gear rotors, the liquid is continuously sucked and discharged. The gear pump has the characteristics of simple structure, small size, simple manufacture and reliable work. The method is mainly applied to hydraulic systems, internal combustion engines, engineering machinery and petroleum industries.
The gear rotors meshed with the gear pumps have great influence on the working performance, and Chinese patent (Linjianming, which is a gear pump unloading device [ P ]. Beijing: CN2057970, 1990-06-06.) provides an unloading device of a gear pump, which solves the problem of liquid trapping, reduces the noise but cannot completely eliminate the noise, weakens the end face seal of the gear due to the existence of an unloading groove, causes the end face leakage to increase, and reduces the volumetric efficiency of the gear pump. Chinese patent (pretty, charles, dune, world beam) proposes a double-arc gear [ P ] guangdong: CN108953554A, 2018-12-07 ], in which a convex arc is connected with a concave arc through a straight line segment, so that the bearing capacity and the transmission efficiency are improved, but when the straight line segment connects the convex arc with the concave arc, a non-smooth connection point exists, the molded lines of a gear rotor are not completely engaged, and the phenomenon of fluid trapping exists.
The gear rotor of the existing gear pump has the following problems: the molded lines of the gear rotor are not completely meshed, and a liquid trapping phenomenon exists.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems that the molded lines of the gear rotor are not completely meshed and the liquid trapping phenomenon exists, the utility model provides a gear rotor of a gear pump, which designs a new end face molded line of the gear rotor, consists of an arc, a high-order curve and a conjugate curve thereof and provides the high-order curve and the conjugate curve thereof; a left tooth crest arc AB, a left transition curve BC, a left tooth bottom arc CD and a left conjugate curve DE, wherein adjacent curves of all sections are smoothly connected; the right tooth crest circular arc ab, the right conjugate curve bc, the right tooth bottom circular arc cd and the right transition curve de are smoothly connected with each other; the utility model provides a no external gear pump rotor of stranded liquid, the line of constituteing is simple, and the optimal design of being convenient for does not produce the reduction process of enclosed volume in the course of the work, and no stranded liquid phenomenon has richened gear pump rotor molded lines type, has important meaning to the development that promotes the gear pump.
The utility model provides a technical scheme that its technical problem adopted is:
a gear rotor of a gear pump comprising: a left gear rotor, a right gear rotor; the left end face molded line of left gear rotor is 6 ~ 12 teeth including the number of teeth, and the molded line of every tooth comprises 4 sections curve smooth connection, does in proper order: a left tooth bottom arc CD, a left transition curve BC, a left tooth top arc AB and a left conjugate curve AE; the left end face molded line of the left gear rotor is formed by sequentially and smoothly connecting the 4 curves end to end, is completely smooth and is centrosymmetric;
the right end face molded line of right gear rotor includes that the number of teeth is 6 ~ 12 teeth, and the molded line of every tooth comprises 4 sections curve smooth connection, does in proper order: a right tooth crest arc cd, a right transition curve bc, a right tooth bottom arc ab and a right conjugate curve ae; the right end face profile of the right gear rotor is formed by sequentially and smoothly connecting the 4 curves end to end, is completely smooth and is centrosymmetric;
the left end face profile of the left gear rotor and the right end face profile of the right gear rotor are in mirror symmetry;
the left conjugate curve AE, the left tooth crest arc AB and the left transition curve BC on the left end face molded line of the left gear rotor can be correctly meshed with the right transition curve BC, the right tooth bottom arc AB and the right conjugate curve AE on the right end face molded line of the right gear rotor respectively;
the left tooth top arc AB of the left end face molded line of the left gear rotor and the center point O of the left tooth bottom arc CD of the left gear rotor1、O2All on the pitch circle of the left gear rotor, the radius of the pitch circle is R2The central angles of the left tooth crest arc AB and the left tooth bottom arc CD are the same and are both 2 theta, and the value range is
Where z is the number of teeth.
A gear rotor of the gear pump establishes a coordinate system by taking a rotation center O point of a left gear rotor (1) as an origin, and the following parameters are given: the number of teeth z; radius of addendum circle R1(ii) a Root circle radius R3(ii) a Arc central angle 2 theta; radius of arc r1；
The equation of the left addendum arc AB of the left end face molded line of the left gear rotor is as follows:
in the formula yAB(x) Is a dependent variable, x is an independent variable;
the equation of the left tooth bottom circular arc CD of the left end face molded line of the left gear rotor is as follows:
(yCD(x)-R2)2+x2＝r1 2，x∈(0,r1sin(θ))
in the formula yCD(x) Is a dependent variable, x is an independent variable;
the equation of the left transition curve BC of the left end face molded line of the left gear rotor is as follows:
yBC(x)＝a3x3+a2x2+a1x+a0，
in the formula yBCIs a dependent variable, x is an independent variable, wherein a0、a1、a2、a3Is constant and is determined by the following system of equations:
the equation of the left conjugate curve AE on the left end face molded line of the left gear rotor is as follows:
in the formula:
is a corner, and the corner is a corner,
wherein
Performing 2z annular arrays on a left tooth bottom arc CD, a left transition curve BC, a left tooth top arc AB and a left conjugate curve AE by taking a rotation center O as a center to obtain a left end surface molded line of the left gear rotor;
mirror-symmetrical the left end face profile of the left gear rotor to obtain the right end face profile of the right gear rotor;
respectively generating a left gear rotor and a right gear rotor according to the left end face profile and the right end face profile along spiral line scanning, wherein the range of the spiral angle β is 10-30 degrees;
the method comprises the following steps: z-the number of teeth; r is1-radius of the arc, mm; r1-radius of addendum circle, mm; r2-pitch circle radius, mm; r3-root circle radius, mm; theta is half of the central angle subtended by the circular arc tooth profile, rad.
The utility model has the advantages that:
① the gear rotor of the gear pump has no trapping and no reduction of the enclosed volume during operation.
② the gear rotor of the gear pump, the left gear rotor (1) and the right gear rotor (2) can realize complete and correct meshing, and the leakage of fluid from a high pressure cavity to a low pressure cavity can be effectively reduced during the working process.
③, the gear rotor of the gear pump has simple assembly line and is convenient for optimizing design.
Drawings
Fig. 1 is a left end face profile (101) view of a left gear rotor (1).
Fig. 2 is a right end surface profile (201) view of the right gear rotor (2).
Fig. 3 is a meshing view of the left end face mold line (101) and the right end face mold line (201).
Fig. 4 is a meshing view of the left gear rotor (1) and the right gear rotor (2).
In the figure: 1-left gear rotor (1); 2-right gear rotor (2); 101-left end face profile (101); 201-right end face molded line (201); r is1-radius of the arc, mm; r1-radius of addendum circle, mm; r2-pitch circle radius, mm; r3-root circle radius, mm; theta is half of the central angle subtended by the circular arc tooth profile, rad.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, a left end surface profile 101 of the left gear rotor 1 is shown, where the left end surface profile 101 is formed by connecting 4 segments of curves, and sequentially: the left end face molded line 101 is formed by sequentially and smoothly connecting the left tooth bottom arc CD, the left transition curve BC, the left tooth top arc AB and the left conjugate curve AE in an end-to-end manner, is completely smooth and is centrosymmetric; establishing a coordinate system by taking a rotation center O point of the left gear rotor 1 as an origin, and setting the following parameters: the number of teeth z; radius of addendum circle R1(ii) a Root circle radius R3(ii) a Arc central angle 2 theta; radius of arc r1；
The equation of the left addendum arc AB of the left end surface profile 101 of the left gear rotor 1 is as follows:
in the formula yAB(x) Is a dependent variable, x is an independent variable;
the equation of the left tooth bottom arc CD of the left end face molded line 101 of the left gear rotor 1 is as follows:
(yCD(x)-R2)2+x2＝r1 2，x∈(0,r1sin(θ))
in the formula yCD(x) Is a dependent variable, x is an independent variable;
the equation of the left transition curve BC of the left end face molded line 101 of the left gear rotor 1 is as follows:
yBC(x)＝a3x3+a2x2+a1x+a0，
in the formula yBCIs a dependent variable, x is an independent variable, wherein a0、a1、a2、a3Is constant and is determined by the following system of equations:
the equation of the left conjugate curve AE on the left end face molded line 101 of the left gear rotor 1 is as follows:
in the formula:
is a corner, and the corner is a corner,
wherein
Performing 2z annular arrays on a left tooth bottom arc CD, a left transition curve BC, a left tooth top arc AB and a left conjugate curve AE by taking a rotation center O as a center to obtain a left end surface molded line 101 of the left gear rotor 1;
as shown in fig. 2, a right end surface profile 201 of the right gear rotor 2 is shown, and the right end surface profile 201 of the right gear rotor 2 is obtained by mirror-symmetry of the left end surface profile 101 of the left gear rotor 1.
As shown in fig. 3, the meshing diagram of the left end face profile 101 and the right end face profile 201 is shown, the left end face profile 101 and the right end face profile 201 are mirror symmetric, and a left conjugate curve AE, a left tooth crest arc AB and a left transition curve BC on the left end face profile 101 can be correctly meshed with a right transition curve BC, a right tooth bottom arc AB and a right conjugate curve AE on the right end face profile 201.
As shown in fig. 4, which is a meshing diagram of the left gear rotor 1 and the right gear rotor 2, the left gear rotor 1 and the right gear rotor 2 are respectively generated along a helical line scan according to the left end face profile 101 and the right end face profile 201, wherein the helical angle β ranges from 10 ° to 30 °;
although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (2)
1. A gear rotor of a gear pump comprising: a left gear rotor (1) and a right gear rotor (2); the method is characterized in that: the left end face molded line (101) of left gear rotor (1) is 6 ~ 12 teeth including the number of teeth, and the molded line of every tooth comprises 4 sections curve smooth connection, does in proper order: a left tooth bottom arc CD, a left transition curve BC, a left tooth top arc AB and a left conjugate curve AE; the left end face molded line (101) of the left gear rotor (1) is formed by sequentially and smoothly connecting the above 4 curves end to end, is completely smooth and is centrosymmetric;
the right end face molded line (201) of right gear rotor (2) is 6 ~ 12 teeth including the number of teeth, and the molded line of every tooth comprises 4 sections curve smooth connection, does in proper order: a right tooth crest arc cd, a right transition curve bc, a right tooth bottom arc ab and a right conjugate curve ae; the right end face profile (201) of the right gear rotor (2) is formed by sequentially and smoothly connecting the four curves in an end-to-end mode, is completely smooth and is centrosymmetric;
the left end face profile (101) of the left gear rotor (1) and the right end face profile (201) of the right gear rotor (2) are in mirror symmetry;
a left conjugate curve AE, a left tooth crest arc AB and a left transition curve BC on a left end face molded line (101) of the left gear rotor (1) can be correctly meshed with a right transition curve BC, a right tooth bottom arc AB and a right conjugate curve AE on a right end face molded line (201) of the right gear rotor (2) respectively;
the central point O of the left tooth top arc AB and the left tooth bottom arc CD of the left end face molded line (101) of the left gear rotor (1)1、O2All on the pitch circle of the left gear rotor (1), the radius of the pitch circle is R2The central angles of the left tooth crest arc AB and the left tooth bottom arc CD are the same and are both 2 theta, and the value range is
Where z is the number of teeth.
2. A gear rotor of a gear pump according to claim 1, a coordinate system is established with the origin at the centre of rotation O point of the left gear rotor (1), given the following parameters: the number of teeth z; radius of addendum circle R1(ii) a Root circle radius R3(ii) a Arc central angle 2 theta; radius of arc r1；
The equation of the left addendum arc AB of the left end face molded line (101) of the left gear rotor (1) is as follows:
in the formula yAB(x) Is a dependent variable, x is an independent variable;
the equation of the left tooth bottom circular arc CD of the left end face molded line (101) of the left gear rotor (1) is as follows:
(yCD(x)-R2)2+x2＝r1 2，x∈(0,r1sin(θ))
in the formula yCD(x) Is a dependent variable, x is an independent variable;
the equation of the left transition curve BC of the left end face molded line (101) of the left gear rotor (1) is as follows:
in the formula yBCIs a dependent variable, x is an independent variable, wherein a0、a1、a2、a3Is constant and is determined by the following system of equations:
the equation of a left conjugate curve AE on the left end face molded line (101) of the left gear rotor (1) is as follows:
in the formula:
is a corner, and the corner is a corner,
wherein
Performing 2z annular arrays on a left tooth bottom arc CD, a left transition curve BC, a left tooth top arc AB and a left conjugate curve AE by taking a rotation center O as a center to obtain a left end face molded line (101) of the left gear rotor (1);
mirror symmetry is carried out on the left end face profile (101) of the left gear rotor (1) to obtain a right end face profile (201) of the right gear rotor (2);
respectively generating a left gear rotor (1) and a right gear rotor (2) along spiral line scanning according to the left end face profile (101) and the right end face profile (201), wherein the range of the spiral angle β is 10-30 degrees;
the method comprises the following steps: z-the number of teeth; r is1-radius of the arc, mm; r1-radius of addendum circle, mm; r2-pitch circle radius, mm; r3-root circle radius, mm; theta is half of the central angle subtended by the circular arc tooth profile, rad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921171076.5U CN210218091U (en) | 2019-07-24 | 2019-07-24 | Gear rotor of gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921171076.5U CN210218091U (en) | 2019-07-24 | 2019-07-24 | Gear rotor of gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210218091U true CN210218091U (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921171076.5U Withdrawn - After Issue CN210218091U (en) | 2019-07-24 | 2019-07-24 | Gear rotor of gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210218091U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242560A (en) * | 2019-07-24 | 2019-09-17 | 中国石油大学(华东) | A kind of gear rotor and its design method of gear pump |
-
2019
- 2019-07-24 CN CN201921171076.5U patent/CN210218091U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242560A (en) * | 2019-07-24 | 2019-09-17 | 中国石油大学(华东) | A kind of gear rotor and its design method of gear pump |
| CN110242560B (en) * | 2019-07-24 | 2023-09-29 | 中国石油大学(华东) | Gear rotor of gear pump and design method thereof |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200331 Effective date of abandoning: 20230929 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200331 Effective date of abandoning: 20230929 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |