CN102996740A - Screw driving mechanism for micro plunger pump - Google Patents
Screw driving mechanism for micro plunger pump Download PDFInfo
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- CN102996740A CN102996740A CN2012104921942A CN201210492194A CN102996740A CN 102996740 A CN102996740 A CN 102996740A CN 2012104921942 A CN2012104921942 A CN 2012104921942A CN 201210492194 A CN201210492194 A CN 201210492194A CN 102996740 A CN102996740 A CN 102996740A
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- driving mechanism
- nut
- rod driving
- plunger pump
- driveshaft
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Abstract
The invention relates to a screw driving mechanism for a micro plunger pump as an important device in an analysis meter. A nut driving rod is sleeved on a screw of the screw driving mechanism, an anti-rotating positioning pin is arranged on the nut driving rod, the nut driving rod is arranged in a sliding sleeve which is provided with a plurality of engine oil reflux grooves and arranged outside the nut driving rod, and two ends of the screw driving mechanism are respectively provided with a right-end sealing ring and a left-end sealing ring. According to the invention, aiming at the improvement of the traditional screw driving mechanism, a photoelectric detector for positioning is arranged outside a driving mechanism, and the whole screw driving mechanism is sealed, so that the oil storage space is increased; the screw driving mechanism is lubricated by using common engine oil, and automatic circulation of the engine oil is realized, therefore the lubrication effect is improved, the wear to the screw driving mechanism can be reduced and the life of the screw driving mechanism is prolonged; and meanwhile, within the lifetime, the screw driving mechanism is not required to be disassembled for maintaining, and if necessary, only engine oil inside the screw driving mechanism needs to be replaced.
Description
Technical field
The present invention relates to the bolt rod driving mechanism of the important devices Microscale plunger pump in a kind of ANALYZER.
Background technique
For detection of the chromatographic analysis quasi-instrument of analyzing, it is light, mechanical, electrical integrated instrument, mainly by infusion pump, the compositions such as liquid control valve, chromatography column, ultraviolet chromatographic detector, circuit control panel and control and analysis software, wherein, Microscale plunger pump is one of them vitals, and it must be to the accurate control of flow, usually its flow is about per minute 2ml, and the pressure operating range is at 1.5-10MPa.Its technical performance also is one of basic mechanical design feature of ANALYZER.
Detect the micro-high-pressure service pump that generally uses in the ANALYZER in chromatogram at present, adopt plunger pump more, driving mode has cam, eccentric wheel and bolt rod driving mode etc., because the bolt rod driving mode, volume is smaller, and certain utilization rate is arranged.Because should trace high-pressure service pump pressure high, cause and bear very large pressure on the drive screw, the engineering plastics of most selflubricatings, can not bear so high pressure, the bolt rod driving mechanism that uses at present, how to make screw rod and nut with steel and brass, bronze, because wherein also must realize accurate location with photoelectric detector, can only use grease lubrication.
The sectional view of existing bolt rod driving Microscale plunger pump such as Fig. 1; As can be seen from Figure 1, because photoelectric detector 5 and move left and right locating stud 6, be contained in the bolt and nut actuator chamber, in order to allow the light of photoelectric detector pass through smoothly, machine oil can not be poured at this position, so this internal system can not seal, more full-bodied lubricating grease have to be adopted, lubricating grease is difficult for nature and flows to the bolt and nut Surface of action, and lubrication effect is undesirable.Such shortcoming is just old lubricating grease to be wiped clean by hand oiling additional new lubricating grease through after a while operation.And this process, must take bolt rod driving mechanism apart carries out, and wastes time and energy, very inconvenient.
Summary of the invention
The objective of the invention is to solve above-mentioned the deficiencies in the prior art, a kind of bolt rod driving mechanism for Microscale plunger pump is proposed, cover has nut driveshaft 10 on the screw rod 11 of bolt rod driving mechanism, anti-rotation locating stud 8 is installed on the nut driveshaft 10, its characteristics are, described nut driveshaft 10 is installed in the nut driveshaft sliding sleeve 9 outward that is provided with some band organic oil back flashes 13, and the two ends of bolt rod driving mechanism are respectively equipped with right-hand member seal ring 16 and left end seal ring 24.
Above-mentioned screw rod 11 is coaxial with stepper motor 12.
Above-mentioned right-hand member seal ring 16 and left end seal ring 24 are U-shaped cross sections.
Above-mentioned right-hand member seal ring 16 and left end seal ring 24 are seal rings made from the engineering plastics of selflubricating.
Outer sliding sleeve 9 tops of above-mentioned nut driveshaft are provided with top accumulator 15, outer sliding sleeve 9 bottoms of nut driveshaft are provided with bottom accumulator 21, are connected with bottom accumulator 21 by through hole 20.
But be provided with nut driveshaft left side cavity 4, nut driveshaft the right cavity 19 of oil storage in the above-mentioned bolt rod driving mechanism.
Above-mentioned top accumulator 15 is provided with oil hole, and bottom accumulator 21 is provided with oil drainage hole; Described oil hole and oil drainage hole are separately installed with screw and gasket seal 14.
In the accumulator of top, be provided with the stock screw 25 of oil-feed deep hole 26 and front end band seal ring.
Further, the present invention proposes a kind of Microscale plunger pump that adopts above-mentioned bolt rod driving mechanism, and its characteristics are, grating 18 and the photoelectric detector 5 of control nut driveshaft 10 and plunger pump piston 3 displacement amounts is installed at the right-hand member of stepping motor rotating shaft 17.
Described grating 18 can accurately be controlled the motor angle of swing, and the length of contrast available technology adopting take millimeter as unit is controlled displacement amount, and precision is further enhanced.
The present invention be directed to the improvement of above-mentioned existing bolt rod driving mechanism, the photoelectric detector of location usefulness is arranged on the driving mechanism outside, whole bolt rod driving mechanism is sealed, increase oil storage space, used regular engine oil lubricated, realized the machine oil automatic cycle, like this, improve lubrication effect, can reduce the wearing and tearing of bolt rod driving mechanism, life-saving, simultaneously, in lifetime, do not need to take mechanism apart and maintain, in case of necessity, only need the machine oil of replacing the inside to get final product.
In order to improve the working life of seal ring, increased oil-feed deep hole and a piston type sealing push rod in oil storage space, can make the air compressing of oil storage space, making cross section is that U-shaped seal ring produces radial pressure.Because of wearing and tearing, when seal degree descends to some extent, sealed screw is replaced by sealed screw with piston push rod after seal ring uses a period of time, can improves the pressure of oil storage space, the seal ring life-span can prolong about 1 times.
Description of drawings
Fig. 1 is the sectional view of existing bolt rod driving Microscale plunger pump.
Fig. 2 is the sectional view of bolt rod driving mechanism for implementing example 1 of the present invention.
Fig. 3 is the sectional view of bolt rod driving mechanism for implementing example 2 of the present invention.
Fig. 4 is the partial enlarged drawing of A section among Fig. 3.
Among the figure:
1, one-way valve, 2, pipe joint, 3, plunger pump piston, 4, nut driveshaft left side cavity, 5, photoelectric detector, 6, the move left and right locating stud, 7, the slip locating slot, 8, anti-rotation locating stud, 9, the sliding sleeve that the nut driveshaft is outer, 10, the nut driveshaft, 11, be connected to the screw rod on the motor shaft, 12, stepper motor, 13, the machine oil back flash, 14, screw and gasket seal, 15, the top accumulator, 16, the right-hand member seal ring, 17, stepping motor rotating shaft, 18, grating, 19, the right cavity of nut driveshaft, 20, through hole, 21, the bottom accumulator, 22, nut driveshaft cavity, 23, shell, 24, the left end seal ring, 25, the stock screw of front end band seal ring, 26, the oil-feed deep hole, 27, screw thread, 28, seal ring.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the present invention is described in detail.
The sectional view of bolt rod driving mechanism for implementing example 1 of the present invention such as Fig. 2.The left side is plunger pump, and the right side is stepper motor, and the centre is bolt rod driving mechanism generalized section.
Among the figure, plunger pump, bolt rod driving mechanism, stepper motor 12 coaxial installations.One-way valve 1, pipe joint 2 structures of plunger pump are constant, screw rod 11 is installed on stepper motor 12 axles, perhaps the motor shaft front end is processed into screw thread, cover has nut driveshaft 10 on the screw rod, anti-rotation locating stud 8 is installed on the nut driveshaft 10, so that screw rod is when rotating forward or backwards, in can only the sliding sleeve 9 outside the nut driveshaft, slip locating slot 7 move left and right are housed along the outside, under the effect of motor at driving current, ceaselessly forward, counter-rotating, nut driveshaft move left and right just drives plunger pump piston fixed thereon 3 to-and-fro motion.
Also have several machine oil back flashes 13 on the sliding sleeve 9 outside the nut driveshaft; when nut driveshaft move left and right; because cavity machine oil flows in back flash; promoted oil circulation; because the machine oil back flash all is positioned at bottom accumulator 21 tops, so can be deposited on the bottom of bottom accumulator 21 by the metal particle of abrasion generation.
In driving mechanism, but the right cavity 19 of nut driveshaft left side cavity 4, nut driveshaft, top accumulator 15, the 21 equal oil storages of bottom accumulator.
Right-hand member seal ring 16 and left end seal ring 24 are seal rings made from the engineering plastics of selflubricating.
The right-hand member of stepping motor rotating shaft 17 has been installed grating 18 and photoelectric detector 5, with control circuit, can accurately control the motor angle of swing, has also just controlled the displacement amount of nut driveshaft 10 and plunger pump piston 3.
During use, the machine oil of adding about 2/3rds in accumulator, when nut driveshaft 10 is moved to the left, the volume of nut driveshaft left side cavity 4, nut driveshaft cavity 22 becomes large simultaneously, the volume of the right cavity 19 of nut driveshaft diminishes, and machine oil flows to the right cavity 19 of nut driveshaft by back flash 13, through hole 20, top accumulator 15, bottom accumulator 21.When nut driveshaft 10 moved right, machine oil flowed in the opposite direction.
Like this, just realized the automatic cycle of machine oil, having guaranteed has enough machine oil in the bolt rod driving mechanism, and simultaneously, the metal particle that wearing and tearing produce is by the bottom of through hole 20 meeting autodepositions at bottom accumulator 21.Can effectively improve the life-span of bolt rod driving mechanism.
More during change engine oil, open first screw and the gasket seal 14 on top, open again following screw 14 and just can discharge used oil, the screw 14 of bottom is screwed on, add an amount of new machine oil after, screw and the gasket seal 14 of twisting good top get final product.
Be the sectional view of bolt rod driving mechanism for implementing example 2 of the present invention such as Fig. 3, its structure is most of identical with Fig. 2 of embodiment 1, but the top oil storage space has increased an oil-feed deep hole 26, seals the top oilhole with the stock screw 25 of front end band seal ring.Referring to the A section partial enlarged drawing of Fig. 4, figure housing 23, screw thread 27, seal ring 28.
Right-hand member seal ring 16, left end seal ring 24 add man-hour, make its external diameter be slightly larger than the cavity of placing seal ring, internal diameter is slightly less than plunger and screw rod, like this, after the installation, seal ring can produce suitable tension force, can keep good sealing, use the most of the time at this device, salable good, the top oil inlet hole seals with normal screws and gasket seal 14.But the prolongation along with the spreadable life, right-hand member seal ring 16 and left end seal ring 24 intermediary movementses part are because of sliding friction, still some wearing and tearing, so that sealing tension force descends, during this time, the stock screw 25 that the normal screws 14 of upper end can be changed into front end band seal ring seals the top oilhole, when it is down installed, piston is downward, air in the compressible accumulator, so that the rising of accumulator internal pressure, and be delivered on the U-shaped cross section of right-hand member seal ring 16 and left end seal ring 24, so that seal ring can have enough sealing radial pressures, can keep good sealing.
The bolt rod driving mechanism of Microscale plunger pump of the present invention is the improvement for existing bolt rod driving mechanism, increased oil storage space, use regular engine oil, realize the machine oil automatic cycle, improved lubrication effect, can reduce the wearing and tearing of bolt rod driving mechanism, life-saving in lifetime, does not need to take mechanism apart and maintains, in case of necessity, only need the machine oil of replacing the inside to get final product.Also increase a stock screw with seal ring, can form suitable pressure at accumulator, kept the radial pressure of seal ring, can prolong the working life of seal ring.
Further, the life-span of this bolt rod driving mechanism depends on that the wearing and tearing of the thread abrasion of bolt and nut and seal ring are so that seal failure, stock screw 25 with front end band seal ring comes the sealed upper end oilhole, can so that the life-span of seal ring greater than the wear-out life of screw thread, in lifetime, need not change seal ring 28.
Claims (9)
1. bolt rod driving mechanism that is used for Microscale plunger pump, the upper cover of the screw rod of bolt rod driving mechanism (11) has nut driveshaft (10), anti-rotation locating stud (8) is installed on the nut driveshaft (10), it is characterized in that, described nut driveshaft (10) is installed in the nut driveshaft sliding sleeve (9) outward that is provided with some band organic oil back flashes (13), and the two ends of bolt rod driving mechanism are respectively equipped with right-hand member seal ring (16) and left end seal ring (24).
2. a kind of bolt rod driving mechanism for Microscale plunger pump according to claim 1 is characterized in that described screw rod (11) is coaxial with stepper motor (12).
3. a kind of bolt rod driving mechanism for Microscale plunger pump according to claim 1 is characterized in that, described right-hand member seal ring (16) and left end seal ring (24) are U-shaped cross sections.
4. according to claim 1 or 3 described a kind of bolt rod driving mechanisms for Microscale plunger pump, it is characterized in that described right-hand member seal ring (16) and left end seal ring (24) are the seal rings made from the engineering plastics of selflubricating.
5. a kind of bolt rod driving mechanism for Microscale plunger pump according to claim 1, it is characterized in that, outer sliding sleeve (9) top of described nut driveshaft is provided with top accumulator (15), outer sliding sleeve (9) bottom of nut driveshaft is provided with bottom accumulator (21), is connected with bottom accumulator (21) by through hole (20).
6. a kind of bolt rod driving mechanism for Microscale plunger pump according to claim 1 is characterized in that, but is provided with nut driveshaft left side cavity (4), nut driveshaft the right cavity (19) of oil storage in the described bolt rod driving mechanism.
7. a kind of bolt rod driving mechanism for Microscale plunger pump according to claim 1 is characterized in that described top accumulator (15) is provided with oil hole, and bottom accumulator (21) is provided with oil drainage hole; Described oil hole and oil drainage hole are separately installed with screw and gasket seal (14).
8. a kind of bolt rod driving mechanism for Microscale plunger pump according to claim 1 is characterized in that, is provided with the stock screw (25) of oil-feed deep hole (26) and front end band seal ring in the accumulator of described top.
9. Microscale plunger pump that adopts described claim 1 bolt rod driving mechanism, it is characterized in that, grating (18) and the photoelectric detector (5) of control nut driveshaft (10) and plunger pump piston (3) displacement amount is installed at the right-hand member of stepping motor rotating shaft (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210492194.2A CN102996740B (en) | 2012-11-27 | 2012-11-27 | Screw driving mechanism for micro plunger pump and the micro plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210492194.2A CN102996740B (en) | 2012-11-27 | 2012-11-27 | Screw driving mechanism for micro plunger pump and the micro plunger pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102996740A true CN102996740A (en) | 2013-03-27 |
| CN102996740B CN102996740B (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210492194.2A Active CN102996740B (en) | 2012-11-27 | 2012-11-27 | Screw driving mechanism for micro plunger pump and the micro plunger pump |
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| Country | Link |
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| CN (1) | CN102996740B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106870540A (en) * | 2017-03-24 | 2017-06-20 | 长葛市航天密封科技有限公司 | A kind of new high leakproofness antirust screw |
| CN108426012A (en) * | 2018-05-17 | 2018-08-21 | 浙江捷昌线性驱动科技股份有限公司 | A kind of electric pushrod and its oiling method with Refuel structure |
| CN113064268A (en) * | 2021-04-13 | 2021-07-02 | 深圳日华自动化技术有限公司 | Micro-moving precise stroke control and adjustment device for nano platform |
| CN113464633A (en) * | 2021-06-10 | 2021-10-01 | 宁波帕瓦莱斯智能科技有限公司 | Motion structure for recycling grease |
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| US20020170369A1 (en) * | 2001-05-15 | 2002-11-21 | Nsk Ltd. | Ball screw |
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| US20110113905A1 (en) * | 2009-11-13 | 2011-05-19 | Paul Dietz | Lubricating unit for a threaded drive unit |
| US8196484B2 (en) * | 2008-04-18 | 2012-06-12 | Tol-O-Matic, Inc. | Electric actuator |
| CN202971784U (en) * | 2012-11-27 | 2013-06-05 | 上海惠中医疗科技有限公司 | Screw rod driving mechanism for microscale plunger pump |
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2012
- 2012-11-27 CN CN201210492194.2A patent/CN102996740B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020170369A1 (en) * | 2001-05-15 | 2002-11-21 | Nsk Ltd. | Ball screw |
| CN1811228A (en) * | 2005-01-28 | 2006-08-02 | 上银科技股份有限公司 | Rolling screw with replaceable oil sump |
| CN101191543A (en) * | 2006-11-29 | 2008-06-04 | 上银科技股份有限公司 | Lubricating structure for screw cap rotating-type ball screw rod |
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| US20090071272A1 (en) * | 2007-09-18 | 2009-03-19 | Hiwin Technologies Corp. | Ball screw device having circulating device |
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| US8196484B2 (en) * | 2008-04-18 | 2012-06-12 | Tol-O-Matic, Inc. | Electric actuator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106870540A (en) * | 2017-03-24 | 2017-06-20 | 长葛市航天密封科技有限公司 | A kind of new high leakproofness antirust screw |
| CN108426012A (en) * | 2018-05-17 | 2018-08-21 | 浙江捷昌线性驱动科技股份有限公司 | A kind of electric pushrod and its oiling method with Refuel structure |
| CN113064268A (en) * | 2021-04-13 | 2021-07-02 | 深圳日华自动化技术有限公司 | Micro-moving precise stroke control and adjustment device for nano platform |
| CN113464633A (en) * | 2021-06-10 | 2021-10-01 | 宁波帕瓦莱斯智能科技有限公司 | Motion structure for recycling grease |
| CN113464633B (en) * | 2021-06-10 | 2022-06-21 | 宁波帕瓦莱斯智能科技有限公司 | Motion structure for recycling grease |
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|---|---|
| CN102996740B (en) | 2015-06-03 |
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