CN1172215A - Mixed transfer pump with internal compression screw arbor - Google Patents
Mixed transfer pump with internal compression screw arbor Download PDFInfo
- Publication number
- CN1172215A CN1172215A CN 97106225 CN97106225A CN1172215A CN 1172215 A CN1172215 A CN 1172215A CN 97106225 CN97106225 CN 97106225 CN 97106225 A CN97106225 A CN 97106225A CN 1172215 A CN1172215 A CN 1172215A
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- tooth
- screw rod
- screw
- female screw
- screw arbor
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Abstract
The present invention discloses a kind of internal compression screw arbor mixed delivery pump. It is characterized by that the ratio of number of teeth of male and female screw arbor is defined at 4:6, and the tooth-form of female screw arbor is respectively formed from circular arc, cycloid and smooth linear transition curve, and the tooth-form of male screw arbor is the conjugate curve of tooth-form of female screw arbor, and an equalizing hole is opened on its compression cavity. When a pair of screw arbors are being in engaged rotating motion, the teeth of female screw arbor are progressively extended into the tooth-groove of male screw arbor, and the tooth-spacing volume can be progressively reduced so as to form compression.
Description
The present invention relates to a kind of screw rod and mix defeated pump, particularly relate to a kind of mixed transfer pump with internal compression screw arbor.
Existing screw rod mixes defeated pump, owing to there is variety of problems, causes actual use to be subjected to very big influence.Mix defeated pump as the MW7.3ZK-1-7 double suction of introducing from Germany two, adopt the non-airtight molded lines of two female screws and three positive screw rods, profile of tooth is made up of cycloid, involute and cycloid A type.Female screw and positive screw rod are meshing with each other, and cooperate with pump housing bore area, form several Seal cages between the import of pump and outlet, and conveying material is boosted step by step.But because their transverse path of contact and the coincidence line of pump housing endoporus do not fit like a glove, there is the triangle of gas leakage, has influence on outlet pressure.And the displacement pump of compression in not having, the air content of conveying material is subjected to certain restriction, and maximum air content is 82V%; Mix defeated pump efficiency and have only 30%.USP4 and for example, 684,335 have disclosed that the compression off-load mixes defeated pump in a kind of twin-screw.Employing is compressed gas along the structure that axial direction changes the screw rod pitch, and incompressible fluid is flowed out by the discharge orifice in the chamber, realizes off-load.Compression structure belongs to variable pitch in this, has only fixing compression ratio.Therefore can't realize off-load at random.
The objective of the invention is to: a kind of mixed defeated pump of screw rod interior compression structure, off-load at random that has is provided.
Further purpose of the present invention is: a kind of good tightness that guarantees is provided, helps removing the mixed transfer pump with internal compression screw arbor of the off-load at random of rubbish in interior foul of teeth groove and the casing.
Another further purpose of the present invention is: a kind of engaging friction that reduces is provided, prevents the mixed transfer pump with internal compression screw arbor of the off-load at random of killing.
Task of the present invention is finished like this: form mixed transfer pump with internal compression screw arbor by yin, yang screw rod, material inlet, material outlet, compression chamber, modulating valve, counter balance pocket, have unloading hole on the compression chamber.The profile of tooth of female screw is made up of circular arc, cycloid and straight line rounding off respectively, and the profile of tooth of positive screw rod is the conjugate curve of female screw profile of tooth.The off-load shape line that constitutes on the yin, yang screw rod, the unloading hole in rotary course on compression chamber can carry out off-load at random.In addition, the gear ratio of positive and negative screw rod is decided to be 4: 6, forms airtight shape line.When a pair of screw rod in engagement rotatablely moves because the tooth of female screw stretches into the teeth groove of positive screw rod gradually, the volume that makes its between cog reduces gradually and forms compression.
Further task of the present invention is finished like this: have spiral chute at the bottom of the positive screw rod tooth of the off-load shape line of compression in having, the female screw tooth top leaves spiral bar, in the course of the work, the spiral bar of female screw tooth top is embedded in the spiral chute at the bottom of the positive screw rod tooth, makes screw rod mix defeated pump and has good air-tightness.In addition, in rotary course, the spiral bar of female screw tooth top is removed the rubbish in the casing just as a scraper plate.
Another further task of the present invention is finished like this: the gap of leaving 0.02～0.04mm in having between the female screw of compression off-load shape line and the positive screw rod.No matter make screw rod mix defeated pump is just changeing still under the inverted status, and Surface of action leaves appropriate gap all the time.Thereby can reduce engaging friction, prevent that pump is killed under abominable transport condition.
The present invention is owing to adopted 4: 6 positive and negative screw rod gear ratio, and the female screw profile of tooth of forming by circular arc, cycloid and straight line rounding off and with the positive tooth shape of screw curve of female screw profile of tooth conjugation, both can compress gas, can carry out off-load at random again, applicable air content is 10V%～98V%, and crude oil, water are that crude oil, water, the mixing of oil field gas of 90V%～2V% failed material;
Have spiral chute at the bottom of the sun screw rod tooth, the female screw tooth top leaves spiral bar, both can guarantee good air-tightness, helps removing foul and the interior rubbish of casing in the teeth groove again;
At the bottom of the sun screw rod tooth and the spiral chute that has of tooth top, can further improve off-load ability at random, in addition, make the face contact of engagement change a contact into, can reduce engaging friction;
Leave the gap of 0.02～0.04mm between the yin, yang screw rod, can prevent the reliability of killing assurance work of pump, improve working life;
Contain sand and impurity level≤250g/m when what mix defeated material
3The time, still can be in normal working;
The efficient of pump can reach 70%.
Below, in conjunction with the accompanying drawings, introduce the embodiment of the invention in detail.
Fig. 1 is the yin, yang tooth shape of screw of mixed transfer pump with internal compression screw arbor of the present invention
Embodiment one
A kind of mixed transfer pump with internal compression screw arbor that is applicable to oil well is made up of yin, yang screw rod, material inlet, material outlet, compression chamber, modulating valve, counter balance pocket, has unloading hole on the compression chamber.The inlet pressure of pump is 0.2～0.5MPa, and outlet pressure is 1.0～1.5MPa, and flow is 1.7m
3/ min.The gear ratio of positive and negative screw rod is decided to be 4: 6, forms airtight shape line.The profile of tooth of female screw is made up of circular arc, cycloid and straight line rounding off respectively, and the profile of tooth of positive screw rod is the conjugate curve of female screw profile of tooth.Down, during the engagement of a pair of screw rod in the pump housing rotatablely moves, form closed compression chamber one by one in working order.The tooth of female screw stretches into the teeth groove of positive screw rod gradually, and the volume that makes its between cog reduces gradually and forms interior compression.By the working medium that material inlet sucks, be 10V%～98V% as air content, crude oil, water are that crude oil, water, the oil field gas of 90V%～2V% mixes defeated material, are compressed in pump.Wherein incompressible water and oil can be discharged by the unloading hole on off-load shape line and the compression chamber randomly, carry out off-load at random, make the pump proper functioning.And gas by compression because of pressure reduces expansion working, acts on liquid to the delivery side of pump place, makes the efficient of pump be increased to 70%.
Embodiment two
A kind of mixed transfer pump with internal compression screw arbor that is applicable to oil well, the inlet pressure of pump are 0.2～0.5MPa, and outlet pressure is 1.0～1.5MPa, and flow is 10m
3/ min.The gear ratio of positive and negative screw rod is decided to be 4: 6, forms airtight shape line.The profile of tooth of female screw is made up of circular arc, cycloid and straight line rounding off respectively, and the profile of tooth of positive screw rod is the conjugate curve of female screw profile of tooth, constitutes the off-load shape line of compression in having.At the bottom of the sun screw rod tooth and tooth top have spiral chute, the female screw tooth top leaves spiral bar, and leaves the gap of 0.02～0.04mm between female screw and positive screw rod.No matter screw rod mixes defeated pump is just changeing still under the inverted status, and Surface of action leaves appropriate gap all the time.Down, during the engagement of a pair of screw rod in the pump housing rotatablely moves, form closed compression chamber one by one in working order.The tooth of female screw stretches into the teeth groove of positive screw rod gradually, and the volume that makes its between cog reduces gradually and forms interior compression.Contain sand and impurity level≤250g/m by what material inlet sucked
3The hybrid working medium is 10V%～98V% as air content, and liquid is that crude oil, water, the oil field gas of 90V%～2V% mixes defeated material, is compressed in pump.Wherein incompressible water and oil can be discharged by the spiral chute and the unloading hole on the compression chamber that have with tooth top at the bottom of off-load shape line, the positive screw rod tooth randomly, carry out off-load at random.Make the pump proper functioning.At the bottom of the spiral bar of female screw tooth top and the positive screw rod tooth, the spiral chute of tooth top, also can remove in the teeth groove rubbish in the foul and casing.In any case, can both guarantee the normal operation of pump, prevent killing and improving working life of pump.The efficient of this mixed transfer pump with internal compression screw arbor can further improve to 75%.
Claims (4)
1. mixed transfer pump with internal compression screw arbor of forming by female screw (1), positive screw rod (2), material inlet, material outlet, compression chamber, modulating valve, counter balance pocket, have unloading hole on the compression chamber, its feature has adopted the off-load shape line of interior compression at dried described female screw (1), positive screw rod (2), the profile of tooth of female screw (1) is made up of circular arc, cycloid and straight line rounding off respectively, the profile of tooth of sun screw rod (2) is the conjugate curve of female screw profile of tooth, and the gear ratio of positive and negative screw rod is 4: 6.
2. mixed transfer pump with internal compression screw arbor according to claim 1 is characterized in that having spiral chute at the bottom of described positive screw rod (2) tooth, and female screw (1) tooth top leaves spiral bar.
3. mixed transfer pump with internal compression screw arbor according to claim 1 is characterized in that described positive screw rod (2) tooth top has spiral chute.
4. mixed transfer pump with internal compression screw arbor according to claim 1 is characterized in that described
Leave the gap of 0.02～0.04mm between female screw (1), the positive screw rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97106225 CN1172215A (en) | 1997-01-14 | 1997-01-14 | Mixed transfer pump with internal compression screw arbor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97106225 CN1172215A (en) | 1997-01-14 | 1997-01-14 | Mixed transfer pump with internal compression screw arbor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1172215A true CN1172215A (en) | 1998-02-04 |
Family
ID=5168489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97106225 Pending CN1172215A (en) | 1997-01-14 | 1997-01-14 | Mixed transfer pump with internal compression screw arbor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172215A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304757C (en) * | 2003-12-10 | 2007-03-14 | 浙江大学 | Dentiform screw with short seal line |
| CN100379993C (en) * | 2005-12-08 | 2008-04-09 | 无锡压缩机股份有限公司 | Oil-free screw compressor rotor clearance structure |
| CN102678542A (en) * | 2011-03-11 | 2012-09-19 | 株式会社丰田自动织机 | Screw pump |
-
1997
- 1997-01-14 CN CN 97106225 patent/CN1172215A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304757C (en) * | 2003-12-10 | 2007-03-14 | 浙江大学 | Dentiform screw with short seal line |
| CN100379993C (en) * | 2005-12-08 | 2008-04-09 | 无锡压缩机股份有限公司 | Oil-free screw compressor rotor clearance structure |
| CN102678542A (en) * | 2011-03-11 | 2012-09-19 | 株式会社丰田自动织机 | Screw pump |
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