CN203837781U - Piston-type flow calibrator with built-in lead screw - Google Patents
Piston-type flow calibrator with built-in lead screw Download PDFInfo
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- CN203837781U CN203837781U CN201420208211.XU CN201420208211U CN203837781U CN 203837781 U CN203837781 U CN 203837781U CN 201420208211 U CN201420208211 U CN 201420208211U CN 203837781 U CN203837781 U CN 203837781U
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- leading screw
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- lead screw
- alignment device
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Abstract
The utility model provides a piston-type flow calibrator with a built-in lead screw, and relates to the field of flow measuring. The piston-type flow calibrator comprises a cylinder, an upper end cover provided with a guide hole and a lower end cover provided with a transmission hole. A disk-shaped piston with a through hole is arranged in the cylinder, the through hole is fixedly connected with a lead screw nut, the lead screw nut is in threaded connection with the lead screw, the upper end of the through hole is fixedly connected with a piston rod, the lead screw is connected with the piston rod in an inserted mode, the piston rod is in slidable connection with the guide hole, and the lower portion of the lead screw is in rotatable connection with the transmission hole. The piston-type flow calibrator solves the technical problems that an existing piston-type flow calibrator is large in size and difficult to move. The piston-type flow calibrator with the built-in lead screw has the advantages that the disturbance problem of a piston cylinder is eliminated and the thickness of the cylinder is reduced; system errors caused by a lead screw transmission amplitude gap and disturbance are eliminated and the flow calibrator is more reliable; a guide mechanism does not need to be arranged specially, the lead screw is arranged in the piston rod, therefore, the structure is compact, the size is small, and the piston-type flow calibrator is easy to carry and suitable for on-site calibration; all cross sections of a sealed cavity are completely identical and use is more convenient.
Description
Technical field
The utility model relates to flow measurement technology field, especially relates to a kind of piston type traffic alignment device structure.
Background technology
The piston of existing active piston formula traffic alignment device is promoted by gear train, and is ensured the shifting balance of piston by guiding mechanism.The most of piston cylinder of this structure is horizontal.Because the length of the piston cylinder of piston prover is much larger than the diameter of piston cylinder, in order to prevent that the degree of disturbing that piston cylinder accumbency produces from affecting traffic alignment precision, piston in cylinder wall must do very thickly, causes that piston/cylinder is huge to such an extent as to calibrating device entirety is very heavy, is difficult to move.Chinese patent application publication No. CN102175292A, on September 7 2011 Shen Qing Publication day, the patent of invention that name is called " piston-type gas flow standard device " discloses a kind of piston type gas flow calibrating device.The structure of this device is rack-mount by bearing plate, piston cylinder upper end is connected with bearing plate lower end, sleeve is equipped with in bearing plate upper end, being contained in piston cylinder piston rod interior and that be connected with piston passes after sleeve, the upper end of piston rod is connected with the lower end of screw mandrel, guide plate is installed in piston rod upper end, guide plate both sides are enclosed within respectively in the guide rod being arranged in sleeve, the linear bearing and the guide rod formation that are arranged on guide plate are slidably matched, the other end of screw mandrel through after sleeve through shaft coupling, speed reduction unit, stepper motor is connected with scrambler, piston cylinder lower end is connected with end cap, end cap is provided with outlet pipe, the side of outlet pipe has the interface holes of mounting temperature sensor and pressure transducer.Although this structure piston cylinder has adopted vertical structure, because guide pole is arranged on piston cylinder top, guide pole is also provided with sleeve outward, and whole device does very highly, and the useful piston cylinder of traffic alignment is only had to the half of device.Guarantee traffic alignment precision for the stability of stiffening device, piston in cylinder wall is compelled to do very thick, causes whole traffic alignment device bulky, and this not only wastes material, and traffic alignment device is difficult to move, and can not adapt to traffic alignment device in-line calibration.
Summary of the invention
In order to solve, prior art piston type traffic alignment device is bulky is difficult to move the technical matters that can not adapt to traffic alignment device in-line calibration, and the utility model provides a kind of volume the little piston type traffic alignment device that is applicable to on-site proving of conveniently moving.
The technical solution of the utility model is: a kind of leading screw internally-arranged type piston type traffic alignment device, it comprise passive bottom end cover, with the affixed cylinder body of bottom end cover and the upper end cover affixed with cylinder body upper end, in cylinder body, be provided with discoid piston, piston is provided with through hole, through hole is connected with feed screw nut, the feed screw nut leading screw that has been threaded, through hole upper end is connected with piston rod, leading screw and piston rod are pegged graft, upper end cover is provided with pilot hole, bottom end cover is provided with driving hole, and piston rod is slidably connected with pilot hole, and leading screw bottom and driving hole are rotatably connected.Cylinder body is erect, and can not affect by disturbed degree, and cylinder wall can do thin, has saved material.Leading screw and piston rod are positioned at cylinder body, do not need ad hoc guiding mechanism, have reduced calibrating device volume, conveniently move, and there is greater advantage calibrating aspect at the scene.
As preferably, the through hole stray circle disk-shaped piston center of circle, eccentric throw is δ, the axis of pilot hole, through hole and driving hole coincides; Screw mandrel and piston rod are eccentric to be installed, and guarantees that screw mandrel rotation can not drive piston rotation.
As preferably, piston rod is the word of falling T shape, is the cylindrical structure of upper end closed lower ending opening, and lower surface and piston upper surface are fixed; Guarantee that piston and cylinder body are fixing reliable.Piston, cylinder body, upper end cover and piston rod surround seal chamber, and in seal chamber, the xsect of each cylinder body equates everywhere, reduce systematic error, and traffic alignment device is more reliable, uses more convenient.
As preferably, in pilot hole, be provided with lining, lining and piston rod match; Facilitate piston rod to move.
As preferably, in driving hole, be provided with thrust bearing, leading screw and thrust bearing match; Thrust bearing bears the axial thrust of leading screw and piston transmission.Piston rod, leading screw and piston are subject to downward Action of Gravity Field, and leading screw is connected and only has monolateral gap with feed screw nut, have eliminated the systematic error that gap causes.
As preferably, leading screw is ball-screw; Minimum without sideshake, staring torque, ensure to realize accurate micro-feeding, guarantee traffic alignment device precision.
As preferably, within one week, be provided with the oil groove of depression along piston side, oil groove above and below is at least respectively provided with respectively a road sealing groove, is embedded with O-ring seal in seal groove.Oil and O-ring seal interval form multiple-sealed, guarantee that piston and cylinder body seal are reliable.
As preferably, the upper and lower surface of piston is provided with the protection post of several convex surfaces; Damage the sensor in cylinder body to avoid continuing motion at the situation lower piston of electronic limit failure mechanisms.
As preferably, piston is provided with oil pipe, and oil pipe is L shape, and oil pipe one end is communicated with oil groove, and the oil pipe other end is communicated with piston lower surface.Do not affect seal chamber from the oil-feed of piston lower surface.
As preferably, δ value is piston diameter 0.01 to 0.04 times.
Compared with prior art, the beneficial effects of the utility model are: vertical structure, eliminate degree of the disturbing problem of piston cylinder, and significantly reduce the thickness of cylinder body.Meanwhile, the gap of screw rod transmission width and the systematic error that leading screw degree of disturbing causes have been eliminated.Bottom end cover, as support, simplifies the structure of device, has greatly alleviated installation weight, has saved material.Adopt eccentric structure, without ad hoc guiding mechanism, gear train is arranged in cylinder body, screw mandrel is built in piston rod, not only compact conformation volume little, be easy to carry applicable on-site proving, and allowing affects the factor of the each xsect of seal chamber and is reduced to piston cylinder internal diameter and piston rod external diameter two places, avoided calibrating installation to use for a long time the problem of leading screw dust stratification simultaneously, make flowrate calibrating device more reliable, use convenient.
Brief description of the drawings
Accompanying drawing 1 is front section view of the present utility model;
Accompanying drawing 2 be in Fig. 1 A-A to sectional view;
Accompanying drawing 3 is the vertical view of piston and connecting portion.
In figure: 1-upper end cover; 2-cylinder body; 3-piston; 4-bottom end cover; 5-motor; 11-lining; 12-escape pipe; 21-piston rod; 22-leading screw; 31-feed screw nut; 32-seal groove; 33-oil groove; 34-oil pipe; 35-O-ring seal; 36-protection post; 37-oil pump; 51-shaft coupling.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1:
As shown in figs. 1 and 3, a kind of leading screw internally-arranged type piston type traffic alignment device, it comprise passive bottom end cover 4, with the affixed cylinder body 2 of bottom end cover 4 and the upper end cover 1 affixed with cylinder body 2 upper ends.Cylinder body 2 is elongated cylinder, and cylinder body 2 is erect.Cylinder body 2 upper ends connect cylinder body upper flange plate, and cylinder body 2 lower ends connect cylinder body lower flange, and the upper and lower ring flange of cylinder body and cylinder body 2 are integral.Bottom end cover 4 is in the form of annular discs, and bottom end cover 4 upper surfaces and cylinder body lower flange are fixed by screw.Bottom end cover 4 lower surfaces and support (not shown) are fixed.Upper end cover 1 is in the form of annular discs, and upper end cover 1 lower surface and cylinder body upper flange plate are fixed by screw.In cylinder body 2, be provided with discoid piston 3.Piston 3 is provided with through hole, and through hole connects piston 3 upper and lower surfaces.Through hole is the little shoulder hole of the large lower diameter of upper diameter.Through hole is connected with feed screw nut 31, and feed screw nut 31 is the shape of falling T, and feed screw nut 31 tops embed the hole of through hole minor diameter, and feed screw nut 31 lower ends are fixed by screw and piston 3 lower surfaces.Feed screw nut 31 leading screw 22 that has been threaded, leading screw 22 is ball-screw.Through hole upper end is connected with piston rod 21, and piston rod 21 is the word of falling T shape, is the cylindrical structure of upper end closed lower ending opening, and lower surface and piston 3 upper surfaces are fixed.The diameter of 21 times end discs of piston rod and through hole top major diameter shoulder hole equal diameters, the thickness of 21 times end discs of piston rod and the major diameter shoulder hole deep equality of through hole top.It is fixing by screw and piston 3 that 21 times end discs of piston rod embed through hole top major diameter shoulder hole.Piston 3, cylinder body 2, upper end cover 1 and piston rod 21 form a seal chamber.Upper end cover 1 is provided with escape pipe 12, and escape pipe 12 lower ends are communicated with seal chamber, and the air outlet valve that escape pipe 12 upper ends are shown on stretching out upper end cover 1 upper surface and being arranged on upper end cover 1 is connected.Upper end cover 1 is provided with pilot hole, and pilot hole connects upper end cover 1 upper and lower surface.Bottom end cover 4 is provided with driving hole, and driving hole connects bottom end cover 4 upper and lower surfaces.Described through hole departs from piston 3 centers of circle, and eccentric throw is δ.δ value is 0.01 to 0.04 times of piston 3 diameters.0.03 times that through overtesting δ value is piston 3 diameters is the best.The axis of pilot hole, through hole and driving hole coincides.Piston rod 21 is slidably connected with pilot hole, is provided with lining 11 in pilot hole, and lining 11 is without oily lining.Lining 11 matches with piston rod 21.Lining 11 outer walls and pilot hole inwall interference fit, lining 11 inwalls and piston rod 21 outer wall clearance fit.Leading screw 22 is pegged graft with piston rod 21.Leading screw 22 external diameters are less than piston rod 21 inner diameter of steel flue, and insert after piston rod 21 inner cores on leading screw 22 tops, also gapped between the two.Leading screw 22 is provided with centring ring on circular leading screw near upper end.Centring ring inner round wall and leading screw 22 upper end interference fit on leading screw, centring ring cylindrical wall and piston rod 21 inner core clearance fit on leading screw.Leading screw 22 bottoms and driving hole are rotatably connected.In driving hole, be provided with thrust bearing 41, leading screw 22 matches with thrust bearing 41.Leading screw 22 lower ends are provided with the shaft shoulder, and leading screw 22 shaft shoulder lower end diameters of axle are thinner than shaft shoulder upper diameter.The blowout patche of thrust bearing 41 and leading screw 22 lower end thin axle interference fit, the seat ring of thrust bearing 41 and driving hole interference fit.The upper side of the blowout patche of thrust bearing 41 and leading screw 22 shaft shoulder lower ends are adjacent to.Leading screw 22 lower end shaft extensions go out bottom end cover 4 lower surfaces.Bottom end cover 4 lower surfaces are provided with motor 5, and motor 5 is stepper motor.Motor 5 output shafts are connected with shaft coupling 51, and shaft coupling 51 is fixed with the axle that leading screw 22 stretches out bottom end cover 4 lower surfaces.
As shown in Figure 2, within one week, be provided with the oil groove 33 of depression along piston 3 sides, oil groove 33 above and belows are at least respectively provided with respectively a road sealing groove 32, be embedded with O-ring seal 35(and see Fig. 1 in seal groove 32).The present embodiment taking oil groove 33 up and down each road sealing groove 32 as example.Fig. 2 is that in Fig. 1, A-A is to sectional view, and wherein O-ring seal 35 does not represent.The upper and lower surface of piston 3 is provided with the protection post 36 of several convex surfaces.It is one large one small cylindric that protection post 36 is, and microcephaly is provided with external thread.Piston 3 upper and lower surfaces are provided with blind screw hole, and blind screw hole engages with protection post 36 external threads.The present embodiment: protection post 36 is arranged on two of piston 3 upper surfaces, symmetrical with piston 3 axis; Protection post 36 is arranged on two of piston 3 lower surfaces, symmetrical with piston 3 axis.
As shown in Figure 1, piston 3 is provided with oil pipe 34, and oil pipe 34 is L shape.Oil pipe 34 one end are communicated with oil groove 33, and oil pipe 34 other ends are communicated with piston 3 lower surfaces.Oil pipe 34 upper port are communicated with the bottom land of oil groove 33.Oil pipe 34 lower port are positioned at piston 3 lower surfaces.Piston 3 lower surfaces are provided with oil pump 37, and the oil-out of oil pump 37 is communicated with the lower port of oil pipe 34.
Piston 3, cylinder body 2, upper end cover 1 and piston rod 21 form a seal chamber, and escape pipe 12 lower ends are communicated with seal chamber, and escape pipe 12 upper ends connect air outlet valve, and air outlet valve connects accredited product air intake opening (not shown).Starter motor 5, motor 5 drives leading screw 22 to rotate, and transmits by feed screw nut 31, on piston 3, moves.The sectional area that forms seal chamber due to piston 3, cylinder body 2, upper end cover 1 and piston rod 21 is equal everywhere, and motor 5 is stepper motor, so as long as the quantity of counting motor 5 steppings can draw the gas volume that seal chamber is discharged.
Claims (10)
1. a leading screw internally-arranged type piston type traffic alignment device, it is characterized in that: it comprises passive bottom end cover (4), with the affixed cylinder body (2) of bottom end cover (4) and the upper end cover (1) affixed with cylinder body (2) upper end, in described cylinder body (2), be provided with discoid piston (3), piston (3) is provided with through hole, through hole is connected with feed screw nut (31), feed screw nut (31) leading screw (22) that has been threaded, through hole upper end is connected with piston rod (21), leading screw (22) is pegged graft with piston rod (21), described upper end cover (1) is provided with pilot hole, described bottom end cover (4) is provided with driving hole, piston rod (21) is slidably connected with pilot hole, leading screw (22) is rotatably connected with driving hole.
2. leading screw internally-arranged type piston type traffic alignment device according to claim 1, is characterized in that: described through hole stray circle disk-shaped piston (3) center of circle, and eccentric throw is δ, the axis of described pilot hole, through hole and driving hole coincides.
3. leading screw internally-arranged type piston type traffic alignment device according to claim 1, is characterized in that: described piston rod (21) is the word of falling T shape, is the cylindrical structure of upper end closed lower ending opening, and lower surface and piston (3) upper surface is fixed.
4. according to the leading screw internally-arranged type piston type traffic alignment device described in claim 1 or 3, it is characterized in that: in pilot hole, be provided with lining (11), lining (11) matches with piston rod (21).
5. leading screw internally-arranged type piston type traffic alignment device according to claim 1, is characterized in that: in described driving hole, be provided with thrust bearing (41), described leading screw (22) matches with thrust bearing (41).
6. leading screw internally-arranged type piston type traffic alignment device according to claim 1 or 5, is characterized in that: described leading screw (22) is ball-screw.
7. leading screw internally-arranged type piston type traffic alignment device according to claim 1, it is characterized in that: the oil groove (33) that is provided with depression along piston (3) side for a week, oil groove (33) above and below is at least respectively provided with respectively a road sealing groove (32), is embedded with O-ring seal (35) in seal groove (32).
8. according to the leading screw internally-arranged type piston type traffic alignment device described in claim 1 or 7, it is characterized in that: the upper and lower surface of described piston (3) is provided with the protection post (36) of several convex surfaces.
9. leading screw internally-arranged type piston type traffic alignment device according to claim 7, it is characterized in that: piston (3) is provided with oil pipe (34), oil pipe (34) is L shape, and oil pipe (34) one end is communicated with oil groove (33), and oil pipe (34) other end is communicated with piston (3) lower surface.
10. leading screw internally-arranged type piston type traffic alignment device according to claim 2, is characterized in that: described δ value is 0.01 to 0.04 times of piston (3) diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420208211.XU CN203837781U (en) | 2014-04-28 | 2014-04-28 | Piston-type flow calibrator with built-in lead screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420208211.XU CN203837781U (en) | 2014-04-28 | 2014-04-28 | Piston-type flow calibrator with built-in lead screw |
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| Publication Number | Publication Date |
|---|---|
| CN203837781U true CN203837781U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420208211.XU Expired - Fee Related CN203837781U (en) | 2014-04-28 | 2014-04-28 | Piston-type flow calibrator with built-in lead screw |
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| CN (1) | CN203837781U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289461A (en) * | 2016-08-31 | 2017-01-04 | 金卡高科技股份有限公司 | A kind of two-chamber piston type gas flow standard |
| CN112129384A (en) * | 2020-10-20 | 2020-12-25 | 南宁学院 | Metering and calibrating device for liquid volume detection |
-
2014
- 2014-04-28 CN CN201420208211.XU patent/CN203837781U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289461A (en) * | 2016-08-31 | 2017-01-04 | 金卡高科技股份有限公司 | A kind of two-chamber piston type gas flow standard |
| CN106289461B (en) * | 2016-08-31 | 2019-11-08 | 金卡智能集团股份有限公司 | A kind of two-chamber piston type gas flow standard |
| CN112129384A (en) * | 2020-10-20 | 2020-12-25 | 南宁学院 | Metering and calibrating device for liquid volume detection |
| CN112129384B (en) * | 2020-10-20 | 2023-07-25 | 南宁学院 | Metering calibrating device for liquid volume detection |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 325600 Yueqing Economic Development Zone, Wenzhou, No. seventeen weft Road No. 291, Zhejiang Co-patentee after: Hangzhou Gu Ka intelligent system Co., Ltd Patentee after: Goldcard Smart Group Co.,Ltd. Co-patentee after: Zhejiang Province Measure Science & Technology Research Institute Address before: 325600 Yueqing Economic Development Zone, Wenzhou, No. seventeen weft Road No. 261, Zhejiang Co-patentee before: Hangzhou Gu Ka intelligent system Co., Ltd Patentee before: GoldCard High Technology Co., Ltd. Co-patentee before: Zhejiang Province Measure Science & Technology Research Institute |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20210428 |