CN201843780U - Reverse circular arc type external rotor of internal gear pump - Google Patents
Reverse circular arc type external rotor of internal gear pump Download PDFInfo
- Publication number
- CN201843780U CN201843780U CN2010205750213U CN201020575021U CN201843780U CN 201843780 U CN201843780 U CN 201843780U CN 2010205750213 U CN2010205750213 U CN 2010205750213U CN 201020575021 U CN201020575021 U CN 201020575021U CN 201843780 U CN201843780 U CN 201843780U
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- China
- Prior art keywords
- external rotor
- gear pump
- internal gear
- tooth
- circle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to a reverse circular arc type external rotor of an internal gear pump, which comprises an external rotor body. A plurality of teeth are arranged in the external rotor body. Each tooth comprises a tooth top and a tooth outline which meshes with an internal rotor. A pitch circle which is formed by meshing the external rotor body and the internal rotor is concentric with the external rotor body. The radius of the pitch circle is R. The utility model is characterized in that center points of the tooth outlines form a circle, the radius of the circle is Rd and the Rd is less than R. The overlap ratio of the teeth of external rotor body is more than 1. The tooth outlines are in a concave arc shape. The utility model improves the intensity, the abrasion performance and the efficiency of the internal gear pump and reduces the shake and the noise of the internal gear pump.
Description
Technical field
The utility model relates to a kind of gear pump external rotor, especially a kind of anti-circular arc external rotor of internal gear pump that is used for the positive displacement internal gear pump.
Background technique
The characteristics of gear pump: volume is little, and is in light weight, simple in structure, easily manufactured, and price is low, reliable operation, and self-priming performance is better, and is insensitive to oil contamination, easy to maintenance etc.Crescent gear pump is compared with external gear pump, and it is little to mainly contain volume, advantage such as flow pulsation is little, and noise is little, but processing difficulties.The center of circle 8 of the flank profil 7 of the external rotor of the internal gear pump of prior art is positioned at outside the pitch circle 9, and the tooth matching angle of external rotor is β o=22.54 °, and contact ratio is 22.54/ (360/11)=0.6887.The core technology (wheel flute profile) of internal gear pump is continued to use not raising of initial design always at present, and the occasion high for noise requirements can not finely satisfy.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of intensity height, the anti-circular arc external rotor of internal gear pump that wear resistance is good are provided.
According to the technological scheme that the utility model provides, the anti-circular arc external rotor of a kind of internal gear pump comprises the external rotor body, and described external rotor body interior is provided with a plurality of teeth, and each tooth comprises tooth top and the flank profil that is meshed with internal rotor; The pitch circle that described external rotor body and internal rotor engagement form is concentric with the external rotor body, and the radius of described pitch circle is R; Feature is: the point at the place, the center of circle of described flank profil forms circle, and radius of a circle is Rd, Rd＜R.
The contact ratio of the tooth of described external rotor body＞1.
Described flank profil is concave arc shape.
The utility model has improved intensity, wear resistance and the efficient of internal gear pump, has reduced the vibrations and the noise of internal gear pump.
Description of drawings
The structural representation of the gear pump rotor of Fig. 1 prior art.
Fig. 2 is the structural representation of the external rotor of prior art.
Fig. 3 is a structural representation of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with concrete accompanying drawing.
As shown in Figure 3: the anti-circular arc external rotor of internal gear pump comprises tooth 1, tooth top 2, flank profil 3, pitch circle 4, external rotor body 5, circle 6 etc.
The utility model comprises external rotor body 5, described external rotor body 5 inside are provided with a plurality of teeth 1, the flank profil 3 that each tooth 1 comprises tooth top 2 and is meshed with internal rotor, described external rotor body 5 is concentric with external rotor body 5 with the pitch circle 4 that the internal rotor engagement forms, and the radius of pitch circle 4 is R; The point at the place, the center of circle of flank profil 3 forms circle 6, and the radius of circle 6 is Rd, Rd＜R;
Tooth matching angle β=45.87 of the tooth 1 of described external rotor body 5 °; The contact ratio of described tooth 1 is 1.402;
Described flank profil 3 is concave arc shape.
Working principle of the present utility model: because the radius of the circle 6 that the point at the place, the center of circle of the flank profil 3 of external rotor body 5 forms is less than the radius of pitch circle 4, the tooth matching angle that makes tooth 1 is brought up to β=45.87 ° by existing β o=22.54 °, being contact ratio brings up to 45.87/(360/11 by original 22.54/ (360/11)=0.6887)=1.402, can find out from geometric angle, by changing flank profil 3, flank profil 3 centers of circle are moved on to the contact ratios that can significantly improve rotor in the pitch circle 4 outward by pitch circle 4, in having improved, the area of contact of external rotor, thereby improved the intensity of internal gear pump, wear resistance and efficient have reduced the vibrations and the noise of internal gear pump.Improvement of the present utility model not only taken into account circular tooth gear easily processing and high-bearing capacity advantage but also the advantage of involute tooth high contact ratio is arranged.Through experiment relatively, the utility model can make the gear pump performance of bore 50 and efficient improve, and makes its noise reduce 10db, thereby improves the level and the class of gear pump product.
Claims (3)
1. the anti-circular arc external rotor of internal gear pump comprises external rotor body (5), and described external rotor body (5) inside is provided with a plurality of teeth (1), the flank profil (3) that each tooth (1) comprises tooth top (2) and is meshed with internal rotor; Described external rotor body (5) is concentric with external rotor body (5) with the pitch circle (4) that the internal rotor engagement forms, and the radius of described pitch circle (4) is R; It is characterized in that: the point at the place, the center of circle of described flank profil (3) forms circle (6), and the radius of circle (6) is Rd, Rd＜R.
2. the anti-circular arc external rotor of internal gear pump as claimed in claim 1 is characterized in that: contact ratio＞1 of the tooth (1) of described external rotor body (5).
3. the anti-circular arc external rotor of internal gear pump as claimed in claim 1 is characterized in that: described flank profil (3) is concave arc shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205750213U CN201843780U (en) | 2010-10-25 | 2010-10-25 | Reverse circular arc type external rotor of internal gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205750213U CN201843780U (en) | 2010-10-25 | 2010-10-25 | Reverse circular arc type external rotor of internal gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201843780U true CN201843780U (en) | 2011-05-25 |
Family
ID=44038672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205750213U Expired - Lifetime CN201843780U (en) | 2010-10-25 | 2010-10-25 | Reverse circular arc type external rotor of internal gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201843780U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422442A (en) * | 2015-12-31 | 2016-03-23 | 江苏驰翔精密齿轮股份有限公司 | Internal gear pump |
-
2010
- 2010-10-25 CN CN2010205750213U patent/CN201843780U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422442A (en) * | 2015-12-31 | 2016-03-23 | 江苏驰翔精密齿轮股份有限公司 | Internal gear pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110525 |
|
| CX01 | Expiry of patent term |