CN101393233B - Low current meter calibrating device - Google Patents
Low current meter calibrating device Download PDFInfo
- Publication number
- CN101393233B CN101393233B CN2008102262501A CN200810226250A CN101393233B CN 101393233 B CN101393233 B CN 101393233B CN 2008102262501 A CN2008102262501 A CN 2008102262501A CN 200810226250 A CN200810226250 A CN 200810226250A CN 101393233 B CN101393233 B CN 101393233B
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- water tank
- stepper motor
- rotary column
- annular water
- probe
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Abstract
The present invention provides a calibrating device for a low speed current meter, which comprises an adjustable bracket, and an annular water tank, a rotary column, a rotary arm, a stepper motor, a speed reducer, and a synchronous cog belt which are arranged on the adjustable bracket. A partitioning board is arranged inside the annular water tank. The rotary arm comprises a beam, balanced code shelves which are respectively arranged on two ends of the beam, and an adjustable probe clip with a probe, and the rotary arm is externally covered by a decorative hood. The rotary column is arranged in a center of the annular water tank. The upper part of the water tank is provided with a sealing chamber. An annular four-groove mercury cup, four contact needles and a bridge circuit are arranged inside the water tank, wherein the contact needles are driven by a rotating shaft, and the bridge circuit is formed for the power supply input and the flow velocity signal output during the rotational operation of the probe. A base at the lower part of the rotary column is provided with an air level. The center of the rotary column is provided with the rotating shaft supported by a bearing. A driving disk on the rotating shaft is connected to the stepper motor through a synchronous cog belt and the speed reducer. The stepper motor acquires the distribution and the control of a driving power supply through a computer. The device is small in volume, portable, convenient to use, high in precision, and particularly suitable for the calibration of the flow velocity not larger than 40cm/s.
Description
Technical field
The present invention relates to the current-meter rating device, particularly a kind of low current meter calibrating device refers to that flow velocity is not more than the speed calibration device of 40cm/s.
Background technology
Because of specializing in the power plant cooling water research work, the water velocity of its research object is very low, how below 0.3m/s, even much is several cm/s.Usually low flow velocity refers to the flow velocity less than 0.4m/s.The current-meter rating mode has " hydrostatic drawing type " and " calibrating nozzle formula " two kinds at present.And use " calibrating nozzle formula rating device " to be difficult to accomplish so humble flow velocity; In addition, the tank of " drawing type rating device " is long straight trough, and equipment is big, water is many, payment for initiation is with higher, and flow velocity calibration majority is difficult to assurance calibration precision under low speed like this greater than 1.0m/s.Therefore need a kind of suitable flow velocity of development to be not more than 40cm/s, volume is little, and precision is high, easy-to-use low current meter calibrating device.
Summary of the invention
The objective of the invention is limitation to above-mentioned prior art; A kind of calibration device of low speed current meter is proposed; It should be fit to the calibration that flow velocity is not more than 40cm/s, has filled up the blank of this scope of application, and has high precision, little, the easy-to-use advantage of equipment volume.
The technical scheme taked of the present invention is to achieve these goals: a kind of low current meter calibrating device comprises adjustable support, annular water tank, rotary column, spiral arm, stepper motor, reductor and synchronous cog belt; Adjustable support is used for adjustment height and levelness, is provided with annular water tank and spiral arm on it in order; Be provided with in the annular water tank and be used to reduce the dividing plate that water stirs; Spiral arm comprises beam, is divided into the balanced code frame and the adjustable probe clip at beam two ends, installing probe on the adjustable probe clip, spiral arm overcoat cover of upholstery; Rotary column places the central authorities of annular water tank; Rotary column top is provided with closed chamber; Be provided with annular four groove mercury cups and four contact pilotages that drive through rotating shaft in the closed chamber, constitute the bridge circuit that probe rotates operating power supply input and flow velocity signal output; The pedestal of rotary column bottom is provided with the air level that is used to keep watch on the adjustable support levelness, and the rotary column center is provided with the rotating shaft by bearings, and the drive plate in the rotating shaft is connected to stepper motor through synchronous cog belt, reductor; Stepper motor obtains driving power dispensing and control through computing machine.The physical construction of the annular water tank of minor diameter, compactness, kinematic train and computer intelligence control accurately, promptly the calibration parameter is provided with and all intellectualities of calibration programmed control.So, just, can make this device have little light, the easy-to-use and high-precision advantage of body.
When popping one's head in running in order to make the stirring of water is reduced to minimum, the dividing plate that is provided with in the said annular water tank is " recessed " shape dividing plate.
Said dividing plate is 12, equidistantly on the annular water tank center circle is uniformly distributed with and is vertical configuration with cell wall.
In order further to guarantee the accuracy of flow velocity calibration; Probe location accurate pin mechanism is set; Promptly in said dividing plate, be provided with the probe detent mechanism that comprises that the accurate pin in location, accurate punch block and buzzer are formed on a certain dividing plate; Make and to be located needle point, guarantee that the probe radius of turn is accurate by calibration flow velocity probe central point aligning.
Said bearing is paired radial ball bearing.
Said stepper motor is 45BF005-II type stepper motor, and the speed ratio of said reductor is 40:1, and the ratio of gear of said synchronous cog belt is 2:1, and overall ratio is 80:1.
The invention has the beneficial effects as follows: compare prior art, the low current meter calibrating device of the present invention's invention is fit to the calibration that flow velocity is not more than 40cm/s, has filled up the blank of this scope of application; And have high precision, little, the easy-to-use advantage of equipment volume.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of low current meter calibrating device of the present invention;
Fig. 2 is a hardware controls block diagram of the present invention.
Among the figure: 1 balanced code frame, 2 spiral arms, 3 air levels, 4 O-ring seals, 5 four groove mercury cups, 6 single-row radial ball bearings, 7 single row angular contact ball bearings, 8 synchronizing jugged drive belts and belt wheel, 9 reductors, 10 adjustable supports, 11 stepper motors, 12 adjustable probe clips, 13 annular water tanks.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further, but not as to qualification of the present invention.
A kind of low current meter calibrating device as shown in Figure 1 comprises mechanical part and automatically controlled part.Wherein, mainly consisting of of mechanical part: adjustable support 10, annular water tank 13, spiral arm 2, rotary column, stepper motor 11, reductor 9 and synchronous cog belt.
Adjustable support 10: being steel structure, is the pedestal of apparatus of the present invention main body mechanism.There are three can adjust height in four legs of adjustable support 10, realized the WidFin of pedestal of the present invention.
Annular water tank 13: process internal diameter 972mm, external diameter 1472mm, high 300mm, wall thickness 6mm, ring center circle diameter 1222mm by the fiberglass demoulding.The stirring of water is reduced to minimum when probe is turned round in water, be provided with 12 " recessed " shape dividing plates in the said annular water tank 13, dividing plate equidistantly is uniformly distributed with along the annular water tank center circle, and installs with the tank wall is vertical.
Spiral arm 2: brachium 1188mm, wide 136mm, high 126mm.Comprise beam, be divided into the balanced code frame 1 and the adjustable probe clip 12 at beam two ends.Install static probe on the adjustable probe clip 12.Spiral arm 2 overcoat cover of upholstery.Cover of upholstery is processed by chromatic organic glass, and beam is an I-shaped aluminum alloy beams section bar.
Rotary column: be the function center of this device, comprise column foot seat and closed chamber, tower height 365mm, external diameter 140mm.Be embedded with air level 3 on the column foot seat, can monitor the levelness of column foot seat.Rotary column top is provided with the closed chamber with O-ring seal 4 sealings, four contact pilotages that are provided with four groove mercury cups 5 in the closed chamber and drive through rotating shaft, the bridge circuit of the power supply input of probe and flow velocity signal output in the formation motion.Rotating shaft is the main shaft of rotary column, and it is through single-row radial ball bearing 6 and single row angular contact ball bearing 7 supportings.After the power that stepper motor 11 provides is slowed down by reductor 9, through the rotating shaft of Synchronous Belt Drives to tower.
Power and kinematic train: power source is a 45BF005-II type stepper motor, and highest frequency is 3000HZ, nominal torque 2kg-m.The transmission adopted speed ratio is the Synchronous Belt Drives of reductor 9 and the 2:1 of 40:1, overall ratio 80:1.Synchronous Belt Drives is synchronizing jugged drive belt and belt wheel 8 transmissions in this example.
In order further to guarantee the accuracy of flow velocity calibration, a certain dividing plate in said " recessed " shape dividing plate is provided with the probe detent mechanism.The probe detent mechanism comprises location accurate pin, accurate punch block and buzzer.Wherein, locating accurate needle point, to have indicated this point be 611mm apart from the distance of shaft centerline, error ≯ 2mm.Needle point should be located by the central point of calibration probe aligning, the accuracy of flow velocity calibration of the present invention can be guaranteed.
Hardware controls block diagram of the present invention as shown in Figure 2, its controlling object of the present invention is a stepper motor 11, is to adopt microcomputer that stepper motor 11 is done High Precision Open-loop control.
Technical indicator of the present invention
(1) velocity range: 1～40cm/s;
(2) each velocity amplitude presets rate and fixes time: 1～100s, optional round values;
(3) relative velocity error: 10
-3Magnitude;
(4) power supply: 220V ± 10%, 50HZ;
(5) power: 150W;
(6) ambient temperature and humidity: 10～40 ℃, 20～70%;
(7) volume: 1.5m * 1.5m * 0.7m.
Because the present invention invents and adopted the accurate angular displacement actuation techniques of stepper motor, mechanical hook-up processing and installation accuracy are high, and controlled condition is provided with thorough, so the calibration precision is high; Adopt computer control, automaticity is higher, primary mental abilityization; Overall construction design is reasonable, and advantages of small volume is taken up an area of few.So the low current meter calibrating device of the present invention's invention is particularly suitable for the calibration that flow velocity is not more than 40cm/s.
Above-described embodiment, the present invention embodiment a kind of more preferably just, common variation that those skilled in the art carries out in technical scheme scope of the present invention and replacement all should be included in protection scope of the present invention.
Claims (3)
1. a low current meter calibrating device is characterized in that: comprise adjustable support, annular water tank, rotary column, spiral arm, stepper motor, reductor and synchronous cog belt; Adjustable support is used for adjustment height and levelness, is provided with annular water tank and spiral arm on it in order; Be provided with the dividing plate that is used to reduce the water stirring in the annular water tank, said dividing plate is " recessed " shape dividing plate; Spiral arm comprises beam, is divided into the balanced code frame and the adjustable probe clip at beam two ends, installing probe on the adjustable probe clip, spiral arm overcoat cover of upholstery; Rotary column places the central authorities of annular water tank; Rotary column top is provided with closed chamber; Be provided with annular four groove mercury cups and four contact pilotages that drive through rotating shaft in the closed chamber, constitute the bridge circuit that probe rotates operating power supply input and flow velocity signal output; The pedestal of rotary column bottom is provided with the air level that is used to keep watch on the adjustable support levelness, and the rotary column center is provided with the rotating shaft by bearings, and the drive plate in the rotating shaft is connected to stepper motor through synchronous cog belt, reductor; Stepper motor obtains driving power dispensing and open loop control through computing machine.
2. low current meter calibrating device according to claim 1 is characterized in that: said dividing plate is 12, equidistantly on the annular water tank center circle is uniformly distributed with and is vertical configuration with cell wall.
3. low current meter calibrating device according to claim 1 and 2 is characterized in that: said stepper motor is a 45BF005-II type stepper motor, and the speed ratio of said reductor is 40: 1, and the ratio of gear of said synchronous cog belt is 2: 1, and overall ratio is 80: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102262501A CN101393233B (en) | 2008-11-10 | 2008-11-10 | Low current meter calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102262501A CN101393233B (en) | 2008-11-10 | 2008-11-10 | Low current meter calibrating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101393233A CN101393233A (en) | 2009-03-25 |
| CN101393233B true CN101393233B (en) | 2012-01-25 |
Family
ID=40493625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102262501A Expired - Fee Related CN101393233B (en) | 2008-11-10 | 2008-11-10 | Low current meter calibrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101393233B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405156B (en) * | 2016-10-14 | 2022-07-01 | 中国人民解放军理工大学 | Portable current meter calibrating installation |
| CN110806499B (en) * | 2019-12-06 | 2020-09-18 | 江苏南水科技有限公司 | Flow velocity meter calibrating device and working method thereof |
-
2008
- 2008-11-10 CN CN2008102262501A patent/CN101393233B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101393233A (en) | 2009-03-25 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20141110 |
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| EXPY | Termination of patent right or utility model |