CN102200132A - Rotor tooth profile of double-screw compressor - Google Patents
Rotor tooth profile of double-screw compressor Download PDFInfo
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- CN102200132A CN102200132A CN2010101339429A CN201010133942A CN102200132A CN 102200132 A CN102200132 A CN 102200132A CN 2010101339429 A CN2010101339429 A CN 2010101339429A CN 201010133942 A CN201010133942 A CN 201010133942A CN 102200132 A CN102200132 A CN 102200132A
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Abstract
The invention relates to a rotor profile, and in particular relates to a rotor tooth profile of a double-screw compressor with higher volumetric efficiency. The rotor tooth profile of the double-screw compressor provided by the invention is characterized in that when the shafts of a female rotor and a male rotor in a screw compressor rotate respectively, the tooth profiles of the female rotor and the male rotor are meshed mutually; the end surface tooth profiles of the female rotor and the male rotor are connected by virtue of at least four curves smoothly, thus forming the basic circular arc of the integral tooth profile. The curve of each tooth transits smoothly at a connecting point, the tooth profile has the characteristics of no tip points and less resistance loss; and the female rotor and the male rotor are more smooth and matched in a relative meshed movement, the working efficiency of the compressor can be improved, the tooth profile is easy to manufacture, and the mechanical loss is reduced.
Description
Technical field
The present invention relates to a kind of rotor tooth form, relate in particular to a kind of double-screw compressor rotor tooth form with high volume efficient.
Background technique
Common compressor is to determine air inlet or feed pressure and to go out atmospheric pressure by intermeshing rotations of helical rotor such as the male rotor in it and female rotors.And wherein the development of screw rotor tooth profile is to promote double-screw compressor to improve performance, widens the major impetus of application.Molded lines of rotor generally is formed by connecting from beginning to end by multistage tooth curve.At present, Chang Yong tooth curve a bit, straight line, cycloid, circular arc, ellipse, parabola, involute, hyperbola and envelope thereof.Cusp in the profile of tooth can cause bigger flow perturbation, brings out high noisy; Simultaneously, some point place molded lines is difficult for processing, and tool wear is serious.For avoiding occurring cusp in the molded lines, the design of modern rotor tooth form avoids adopting point, straight line and cycloid mostly, and adopt quadratic curve and envelopes thereof such as circular arc, ellipse, and make rotor realize the sealing of curved surface to curved surface, under different operating modes, adopt different negative and positive rotor gear ratios.
The goal of the invention of existing compressor drum profile of tooth be mostly with different profiles of tooth improving the convenience of rotor processing, and overcome helical rotor simultaneously and turn over issuable mechanical loss in the journey nibbling.Although but the development of cutting element and equipment is increased dramatically, in the design of profile of tooth, to reaches aforementioned two kinds of purposes and still have one big section way to walk.This this theory of the present invention, active development is also made great efforts research, through repeatedly studying and retrofit testing, tooth-shape structure of the present invention is arranged eventually.
Summary of the invention
Technical problem to be solved by this invention provides a kind of rotor tooth form of double helix compressor, this rotor tooth form at male rotor and female rotor relative to meshing when rotating, can reach more slick and sly applying, the processibility of molded lines is superior, reduce its clearance gap and rotate noise, and the convenience of raising cog machining, prolong cutter life.
For solving the problems of the technologies described above, technological scheme of the present invention is as follows: a kind of rotor tooth form of double-screw compressor, be meant the profile of tooth of female rotor and male rotor in the screw compressor, and when each rotated with its axle, the profile of tooth of two rotors was meshing with each other; It is characterized in that described yin, yang rotor end-face profile of tooth is formed by connecting by four sections line smoothings at least,
Described female rotor first paragraph tooth curve A
2B
2, be one section elliptic arc, the center is inscribed within A with the female rotor outside circle in the female rotor pitch circle
2The point; The first paragraph tooth curve A of described male rotor
1B
1, when making pure rolling for the female rotor pitch circle along male rotor, by female rotor first paragraph tooth curve A
2B
2The envelope of the motion track that forms;
Female rotor second segment tooth curve B
2C
2, be point of contact P on the yin, yang rotor pitch circle as the center of circle, radius is one section circular arc of R3, and with first paragraph tooth curve A
2B
2Be smoothly connected; The second segment tooth curve B of male rotor
1C
1, for the one section radius of the center of circle on the point of contact P of yin, yang rotor pitch circle is R
3Circular arc, and with the first paragraph tooth curve A of male rotor
1B
1Be smoothly connected;
The 3rd section tooth curve D of male rotor
1E
1, for the center of circle is positioned at outside the male rotor pitch circle, radius is R
4One section circular arc; The 3rd section tooth curve D of female rotor
2E
2, be when making pure rolling with the male rotor pitch circle along the female rotor pitch circle, to be positioned at outside the male rotor pitch circle by the center of circle, radius is R
4One section circular arc D
1E
1The envelope of the track that forms;
The 4th section tooth curve E of female rotor
2F
2, centered by be positioned at one section elliptic arc of female rotor pitch circle, be inscribed within F with the female rotor outside circle
2Point, and with the 3rd section tooth curve D
2E
2Be smoothly connected; The 4th section tooth curve E of male rotor
1F
1, when making pure rolling for the female rotor pitch circle along the male rotor pitch circle, by the 4th section tooth curve E of female rotor
2F
2The envelope of the motion track that forms is inscribed within F with circle at the bottom of the male rotor tooth
1Point, and with the 3rd section tooth curve D
1E
1Be smoothly connected;
Form female rotor, the whole tooth curve of male rotor by being meshing with each other of above-mentioned at least four sections female rotor tooth curves and male rotor tooth curve.
Can on female rotor, form the 5th section tooth curve F again
2A
2, the 5th section tooth curve F
2A
2Axis of rotation O with female rotor
2Be the center of circle, radius is female rotor Outside radius R
2One section circular arc; Form the 5th section tooth curve F on the male rotor
1A
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is one section circular arc of radius of arc at the bottom of the male rotor tooth, and promptly radius is that male rotor Pitch radius and female rotor Pitch radius sum deduct female rotor Outside radius (R again
J1+ R
J2-R
2).
Can form the 6th section tooth curve C at female rotor again
2D
2, with the axis of rotation O of female rotor
2Be the center of circle, radius is female rotor radius of addendum R
2-R
3One section female rotor tooth at the bottom of circular arc, with second segment male rotor tooth curve B
2C
2Be smoothly connected; Form the 6th section tooth curve C on the male rotor
1D
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is male rotor outside circle R
1One section circular arc, with second segment male rotor tooth curve B
1C
1Be smoothly connected.
Above-mentioned the 6th section tooth curve also can form the 5th section tooth curve at former female rotor separately, namely is to form on the female rotor the 5th section tooth curve C
2D
2, with the axis of rotation O of female rotor
2Be the center of circle, radius is R
2-R
3One section circular arc, be circular arc at the bottom of the female rotor tooth, with second segment female rotor tooth curve B
2C
2Be smoothly connected; Form the 6th section tooth curve C on the male rotor
1D
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is male rotor outside circle R
1One section circular arc, with second segment male rotor tooth curve B
1C
1Be smoothly connected.
Described female rotor profile of tooth is monolateral asymmetrical type.
Described female rotor profile of tooth is bilateral asymmetrical type.
The described male rotor number of teeth is at least 3 teeth, 7 teeth at the most, the gear ratio male rotor of female rotor many 1 or 2 teeth.
Beneficial effect of the present invention, each tooth curve is in tie point place smooth transition, and profile of tooth does not have cusp, and drag losses is little, and more slick and sly applying when making the relative gear motion of male rotor, female rotor can improve compressor operating efficient.The flank of tooth forms banded sealing, helps forming liquid film, good airproof performance.Rotor is convenient to processing and is detected, suitable moulding or grinding, and processing characteristics is good, reduces mechanical loss.
Further specify technological scheme of the present invention and embodiment below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the bilateral asymmetric tooth-shape structure schematic representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is made a concrete analysis of.The rotor tooth form of a kind of double-screw compressor of the present invention is meant the profile of tooth of female rotor and male rotor in the screw compressor, and when each rotated with its axle, the profile of tooth of two rotors was meshing with each other and forms; Described yin, yang rotor end-face profile of tooth is formed by connecting by four sections line smoothings at least.
As shown in Figure 1 and Figure 2, on female rotor 2 with its axis of rotation O
2Be the center, by interior at the bottom of locating to cook up concentric female rotor tooth circle 2A, female rotor pitch circle 2B, and female rotor top circle 2C.
On the male rotor 1 with its axis of rotation O
1Be the center, mark circle 1A, male rotor pitch circle 1B at the bottom of the concentric male rotor tooth, and male rotor top circle 1C from inside to outside.During by simulation female rotor and the intermeshing rotation of male rotor, simulate tooth curve on the male rotor by the tooth curve on the female rotor.
Embodiment 1:
Tooth-shape structure of the present invention, male rotor adopts four teeth in the present embodiment, and female rotor adopts six teeth.
Wherein, female rotor first paragraph tooth curve A
2B
2, being tooth curve elliptic arc, it is one section elliptic arc, and the center is in female rotor pitch circle 2B, and 2C is inscribed within A with the female rotor outside circle
2The point.Male rotor first paragraph tooth curve A
1B
1, when making pure rolling for female rotor pitch circle 2B along male rotor, by female rotor first paragraph tooth curve A
2B
2The envelope of the motion track that forms.
Female rotor second segment tooth curve B
2C
2, be point of contact P on female rotor pitch circle 2B and the male rotor pitch circle 1B as the center of circle, radius is one section circular arc of R3, and with first paragraph tooth curve A
2B
2Be smoothly connected.The second segment tooth curve B of male rotor
1C
1, for the one section radius of the center of circle on the point of contact P of yin, yang rotor pitch circle is R
3Circular arc, and with the first paragraph tooth curve A of male rotor
1B
1Be smoothly connected.
The 3rd section tooth curve D of male rotor
1E
1, for the center of circle is positioned at outside the male rotor pitch circle 1B, radius is R
4One section circular arc.The 3rd section tooth curve D of female rotor
2E
2, be when making pure rolling with male rotor pitch circle 1B along female rotor pitch circle 2B, to be positioned at outside the male rotor pitch circle by the center of circle, radius is R
4One section circular arc D
1E
1The envelope of the track that forms.
The 4th section tooth curve E of female rotor
2F
2, centered by be positioned at one section elliptic arc of female rotor pitch circle 2B, 2C is inscribed within F with the female rotor outside circle
2Point, and with the 3rd section tooth curve D
2E
2Be smoothly connected.The 4th section tooth curve E of male rotor
1F
1, when making pure rolling for female rotor pitch circle 2B along the male rotor pitch circle, by female rotor tooth curve E
2F
2The envelope of the motion track that forms is inscribed within F with circle at the bottom of the male rotor tooth
1Point, and with the 3rd section male rotor tooth curve D
1E
1Be smoothly connected.
Intermeshing by above-mentioned at least four sections female rotor tooth curves and male rotor tooth curve can form female rotor, the whole slick and sly tooth curve of male rotor.
Embodiment 2:
In addition, the present invention can form the 5th section tooth curve F by the female rotor 2 on embodiment 1 again
2A
2, the 5th section tooth curve F
2A
2Axis of rotation O with female rotor
2Be the center of circle, radius is the radius R of female rotor outside circle 2C
2One section female rotor tooth top circular arc.Form the 5th section tooth curve F on the male rotor 1
1A
1, with the axis of rotation O of male rotor
1For the center of circle, radius are radius of arc R at the bottom of the male rotor tooth
5One section circular arc, this R
5=male rotor Pitch radius R
J1+ female rotor Pitch radius R
J2-female rotor Outside radius R
2
Be that above-mentioned female rotor profile of tooth and male rotor profile of tooth is to form whole slick and sly tooth curve by five sections curves.Embodiment 1 compares with embodiment 2, is equivalent to remove female rotor tooth top circular arc F
2A
2With circular arc F at the bottom of the male rotor tooth
1A
1, with the 4th section tooth curve E of female rotor
2F
2With first paragraph tooth curve A
2B
2Be smoothly connected in A
2/ F
2Point, the male rotor tooth curve E that is formed by envelope
1F
1With tooth curve A
1B
1Be smoothly connected in A
1/ F
1The point.This moment, rotor tooth form became four sections tooth curves by five sections tooth curves.
Embodiment 3:
The present invention also can increase another tooth curve on the basis of embodiment 1, and this tooth curve is the tooth curve C on female rotor 2
2D
2, with female rotor axis of rotation O
2Be the center of circle, radius is (R
2-R
3) one section circular arc, be circular arc, wherein R at the bottom of the female rotor tooth
2Be the female rotor radius of addendum.This tooth curve C
2D
2With female rotor second segment tooth curve B
2C
2Be smoothly connected.Tooth curve C on the male rotor 1
1D
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is male rotor outside circle R
1One section circular arc, with second segment male rotor tooth curve B
1C
1Be smoothly connected.
Be that above-mentioned female rotor profile of tooth and male rotor profile of tooth is to form whole slick and sly tooth curve by five sections curves.Embodiment 1 compares with embodiment 3, is equivalent to remove female rotor tooth curve C
2D
2With male rotor tooth curve C
1D
1, with tooth curve B
2C
2With the tooth curve D that is formed by envelope
2E
2Be smoothly connected in C
2/ D
2Point, tooth curve B
1C
1With tooth curve D
1E
1Be smoothly connected in C
1/ D
1The point.This moment, rotor tooth form became four sections tooth curves by five sections tooth curves.
Embodiment 4:
The present invention also can on the basis of embodiment 2, form the 6th section tooth curve C at female rotor 2 again again
2D
2, this tooth curve is with female rotor axis of rotation O
2Be the center of circle, radius is (R
2-R
3) one section circular arc, be circular arc at the bottom of the female rotor tooth, with female rotor second segment tooth curve B
2C
2Be smoothly connected.Form the 6th section tooth curve C on the male rotor 1
1D
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is male rotor outside circle R
1One section circular arc, with second segment male rotor tooth curve B
1C
1Be smoothly connected.
Be that above-mentioned female rotor profile of tooth and male rotor profile of tooth is to form whole slick and sly tooth curve by six sections curves.Embodiment 1 compares with embodiment 4, is equivalent to remove female rotor tooth curve C
2D
2With male rotor tooth curve C
1D
1, female rotor tooth top circular arc F
2A
2With circular arc F at the bottom of the male rotor tooth
1A
1, with tooth curve B
2C
2With tooth curve D
2E
2Be smoothly connected in C
2/ D
2Point is with tooth curve B
1C
1With tooth curve D
1E
1Be smoothly connected in C
1/ D
1Point, tooth curve E
2F
2With tooth curve A
2B
2Be smoothly connected in A
2/ F
2Point, tooth curve E
1F
1With tooth curve A
1B
1Be smoothly connected in A
1/ F
1The point.This moment, rotor tooth form became four sections tooth curves by six sections tooth curves.
From the above as can be known, tooth profile of screw rotor of the present invention can improve common tooth profile of screw rotor processing difficulties really, efficient is low and the shortcoming of generation noise.
Above-mentioned female rotor profile of tooth can be monolateral asymmetrical type, and promptly the profile of tooth molded lines is all in pitch circle or outside the pitch circle, referring to shown in Figure 1.Above-mentioned female rotor profile of tooth also can be bilateral asymmetrical type, referring to shown in Figure 2.
The above-mentioned male rotor number of teeth is at least 3 teeth, 7 teeth at the most, the gear ratio male rotor of female rotor many 1 or 2 teeth.Can choose the different negative and positive rotor numbers of teeth according to operating mode.
The above is the preferable specific embodiment of the present invention, and as if the decoration of the conversion of doing according to conception of the present invention, the effect that it produced is identical, does not exceed the content that the present invention is contained yet, all should be within the scope of the invention.
Claims (9)
1. the rotor tooth form of a double-screw compressor is meant the profile of tooth of female rotor and male rotor in the screw compressor, and when each rotated with its axle, the profile of tooth of two rotors was meshing with each other; It is characterized in that described yin, yang rotor end-face profile of tooth is formed by connecting by four sections line smoothings at least,
Described female rotor first paragraph tooth curve A
2B
2, be one section elliptic arc, the center is inscribed within A with the female rotor outside circle in the female rotor pitch circle
2The point; The first paragraph tooth curve A of described male rotor
1B
1, when making pure rolling for the female rotor pitch circle along male rotor, by female rotor first paragraph tooth curve A
2B
2The envelope of the motion track that forms;
Female rotor second segment tooth curve B
2C
2, be point of contact P on the yin, yang rotor pitch circle as the center of circle, radius is one section circular arc of R3, and with first paragraph tooth curve A
2B
2Be smoothly connected; The second segment tooth curve B of male rotor
1C
1, for the one section radius of the center of circle on the point of contact P of yin, yang rotor pitch circle is R
3Circular arc, and with the first paragraph tooth curve A of male rotor
1B
1Be smoothly connected;
The 3rd section tooth curve D of male rotor
1E
1, for the center of circle is positioned at outside the male rotor pitch circle, radius is R
4One section circular arc; The 3rd section tooth curve D of female rotor
2E
2, be when making pure rolling with the male rotor pitch circle along the female rotor pitch circle, to be positioned at outside the male rotor pitch circle by the center of circle, radius is R
4One section circular arc D
1E
1The envelope of the track that forms;
The 4th section tooth curve E of female rotor
2F
2, centered by be positioned at one section elliptic arc of female rotor pitch circle, be inscribed within F with the female rotor outside circle
2Point, and with the 3rd section tooth curve D
2E
2Be smoothly connected; The 4th section tooth curve E of male rotor
1F
1, when making pure rolling for the female rotor pitch circle along the male rotor pitch circle, by the 4th section tooth curve E of female rotor
2F
2The envelope of the motion track that forms is inscribed within F with circle at the bottom of the male rotor tooth
1Point, and with the 3rd section tooth curve D
1E
1Be smoothly connected;
Form female rotor, the whole tooth curve of male rotor by being meshing with each other of above-mentioned at least four sections female rotor tooth curves and male rotor tooth curve.
2. the rotor tooth form of a kind of double-screw compressor according to claim 1 is characterized in that: can form the 5th section tooth curve F at female rotor again
2A
2, the 5th section tooth curve F
2A
2Axis of rotation O with female rotor
2Be the center of circle, radius is female rotor radius of addendum R
2One section circular arc; Form the 5th section tooth curve F on the male rotor
1A
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is arc radius R at the bottom of the male rotor tooth
5One section circular arc, R
5=male rotor pitch radius R
J1+ female rotor pitch radius R
J2-female rotor radius of addendum R
2
3. the rotor tooth form of a kind of double-screw compressor according to claim 2 is characterized in that: can form the 6th section tooth curve C at female rotor again
2D
2, with the axis of rotation O of female rotor
2Be the center of circle, radius is R
2-R
3One section female rotor tooth at the bottom of circular arc, with second segment male rotor tooth curve B
2C
2Be smoothly connected; Form the 6th section tooth curve C on the male rotor
1D
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is male rotor outside circle R
1One section circular arc, with second segment male rotor tooth curve B
1C
1Be smoothly connected.
4. the rotor tooth form of a kind of double-screw compressor according to claim 1 is characterized in that: can form the 5th section tooth curve C again on female rotor
2D
2, with the axis of rotation O of female rotor
2Be the center of circle, radius is female rotor radius of addendum R
2-R
3One section circular arc, be circular arc at the bottom of the female rotor tooth, with second segment female rotor tooth curve B
2C
2Be smoothly connected; Form the 6th section tooth curve C on the male rotor
1D
1, with the axis of rotation O of male rotor
1Be the center of circle, radius is male rotor outside circle R
1One section circular arc, with second segment male rotor tooth curve B
1C
1Be smoothly connected.
5. according to the rotor tooth form of the described a kind of double-screw compressor of claim 1 to 4, it is characterized in that: described female rotor profile of tooth is monolateral asymmetrical type.
6. according to the rotor tooth form of the described a kind of double-screw compressor of claim 1 to 4, it is characterized in that: described female rotor profile of tooth is bilateral asymmetrical type.
7. according to the rotor tooth form of the described a kind of double-screw compressor of claim 1 to 4, it is characterized in that: the described male rotor number of teeth is at least 3 teeth, 7 teeth at the most, the gear ratio male rotor of female rotor many 1 or 2 teeth.
8. the rotor tooth form of a kind of double-screw compressor according to claim 5 is characterized in that: the described male rotor number of teeth is at least 3 teeth, 7 teeth at the most, the gear ratio male rotor of female rotor many 1 or 2 teeth.
9. the rotor tooth form of a kind of double-screw compressor according to claim 6 is characterized in that: the described male rotor number of teeth is at least 3 teeth, 7 teeth at the most, the gear ratio male rotor of female rotor many 1 or 2 teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010133942 CN102200132B (en) | 2010-03-26 | 2010-03-26 | Rotor tooth profile of double-screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010133942 CN102200132B (en) | 2010-03-26 | 2010-03-26 | Rotor tooth profile of double-screw compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102200132A true CN102200132A (en) | 2011-09-28 |
| CN102200132B CN102200132B (en) | 2013-05-01 |
Family
ID=44661035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010133942 Active CN102200132B (en) | 2010-03-26 | 2010-03-26 | Rotor tooth profile of double-screw compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102200132B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291619A (en) * | 2013-07-03 | 2013-09-11 | 上海齐耀螺杆机械有限公司 | Double-screw compressor rotor molded line for oil injection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276785A (en) * | 1979-11-16 | 1981-07-07 | Rouverol William S | Low-noise gearing |
| US5682793A (en) * | 1993-09-21 | 1997-11-04 | Liao; Zhenyi | Engaged rotor |
| CN1676935A (en) * | 2004-03-30 | 2005-10-05 | 李汗强 | Rotor tooth profile for helical-lobe compressor |
| CN101435425A (en) * | 2008-12-12 | 2009-05-20 | 中国船舶重工集团公司第七一一研究所 | Novel tooth form of screw rod rotor of double-screw compressor |
-
2010
- 2010-03-26 CN CN 201010133942 patent/CN102200132B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276785A (en) * | 1979-11-16 | 1981-07-07 | Rouverol William S | Low-noise gearing |
| US5682793A (en) * | 1993-09-21 | 1997-11-04 | Liao; Zhenyi | Engaged rotor |
| CN1676935A (en) * | 2004-03-30 | 2005-10-05 | 李汗强 | Rotor tooth profile for helical-lobe compressor |
| CN101435425A (en) * | 2008-12-12 | 2009-05-20 | 中国船舶重工集团公司第七一一研究所 | Novel tooth form of screw rod rotor of double-screw compressor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291619A (en) * | 2013-07-03 | 2013-09-11 | 上海齐耀螺杆机械有限公司 | Double-screw compressor rotor molded line for oil injection |
| CN103291619B (en) * | 2013-07-03 | 2015-06-17 | 上海齐耀螺杆机械有限公司 | Double-screw compressor rotor molded line for oil injection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102200132B (en) | 2013-05-01 |
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Address after: 200431 No. 815 West Changjiang Road, Shanghai Applicant after: Shanghai Dalong Machinery Factory Company Limited Address before: 200431 Shanghai Yangtze River West Road, Baoshan District, No. 815 Applicant before: Shanghai Electrical Compressor Pumps Co.,Ltd. |
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