CN204421970U - A kind of low discharge turbo flow meter - Google Patents
A kind of low discharge turbo flow meter Download PDFInfo
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- CN204421970U CN204421970U CN201520022873.2U CN201520022873U CN204421970U CN 204421970 U CN204421970 U CN 204421970U CN 201520022873 U CN201520022873 U CN 201520022873U CN 204421970 U CN204421970 U CN 204421970U
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Abstract
The utility model is a kind of low discharge turbo flow meter of application of measuring media under low discharge and high-precision requirement.In order to solve, existing turbo flow meter range is less, low discharge scope time precision lower shortcoming, this flowmeter comprises housing, the impeller be placed in housing, through impeller axle and be fixed in shell channel the fore-stock and after-poppet that are positioned at impeller both sides, the two ends of axle are fixed on fore-stock and after-poppet by axle sleeve, be provided with sliding bearing between impeller and axle to realize long service life, be applicable to the sensitivity advantages of higher of processing, flowmeter.
Description
Technical field
The utility model belongs to field of flow meters, particularly relates to a kind of low discharge turbo flow meter of application of measuring media under low discharge and high-precision requirement.
Background technology
Turbine is adopted to carry out the flowmeter measured.Flow velocity is first converted to the rotating speed of turbine by it, then rotating speed is converted to the electric signal be directly proportional to flow.This flowmeter is for detecting instantaneous delivery and total flow integration, and its output signal is frequency, is easy to digitizing.In figure, inductive coil is fixed on housing together with permanent magnet.When ferromagnetism turbo blade is through magnet, the magnetic resistance of magnetic circuit changes, thus produces induced signal.Signal amplifies and shaping through amplifier, delivers to counter or frequency meter, shows total flow integration.Simultaneously by pulsed frequency through overfrequency-voltage transitions to indicate instantaneous delivery.The rotating speed of impeller is proportional to flow, and the revolution of impeller is proportional to the total amount flow through.The output of turbo flow meter is frequency modulation (PFM) formula signal, not only increases the anti-interference of testing circuit, and simplifies flow quantity detecting system.Its range ratio can reach 10:1, and precision is within ± 0.2%.The time constant of the turbo flow meter that inertia is little and size is little can reach 0.01 second.
At present, the principle of work of turbo flow meter is the mean flow rate by mutliblade impeller (turbine) perception detected fluid as stated above, thus derives flow velocity and the flow of fluid.When its shortcoming is high precision, range is smaller, and especially when low discharge, range ratio is less.
And current turbo flow meter, axle and impeller dress up one, and during work, axle rotates together with impeller, and requirement is processed, assembly precision is high, otherwise impeller is easily stuck.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of low discharge turbo flow meter, be intended to overcome that existing turbo flow meter range is less, low discharge scope time precision lower shortcoming.
The utility model solves the technical scheme that its technical matters adopts:
A kind of low discharge turbo flow meter, comprises housing, the position of corresponding impeller on the impeller 9 be placed in housing, housing
arrangehave sensor and install gauge outfit, through impeller axle and be fixed in shell channel be positioned at impeller both sides fore-stock and after-poppet, the passway at housing two ends is provided with clamp nut, for pipe laying and fixing fore-stock and after-poppet, two ends in passage arrange mozzle, spacer is provided with between mozzle and the inwall of passage, the two ends of axle are fixed on fore-stock and after-poppet by axle sleeve, are provided with sliding bearing between impeller and axle.
Further, axle and fore-stock and after-poppet are fixed as one, and impeller is when axle is rotated by sliding bearing, and axle maintains static.
Further, described impeller comprises two panels blade, and the pitch angle alpha will of blade is 28 ° ~ 32 °, and the length L of impeller is set to 1/2 length of helical pitch.
The beneficial effects of the utility model are:
1, the utility model is by the lead angle of adjustment impeller, changes the measurement range of flowmeter.Select suitable lead angle, the moment of resistance impact that impeller can be made operationally suffered is less, and long service life, is applicable to processing.
2, the blade of more than four or four of the prior art is become two panels by the utility model, makes the lightweight of impeller, improves the sensitivity of flowmeter.
3, the blade wheel structure that the utility model turbo flow meter adopts not only has the advantage of flowmeter in the past, and expands the range of flowmeter, and flowmeter measuring accuracy when low discharge also has significant improvement.
4, impeller length be defined as 1/2 helical pitch, too short then low by the fluid energy utilization factor of flowmeter, long then blade table area increases, and viscous friction moment increases, and resistance is large.
5, the utility model turbo flow meter range ratio when 0.5 class precision can reach 1:10 even 1:20, and 0.2 grade time, range ratio also can reach 1:5, and when low discharge, effect is more obvious.
Accompanying drawing explanation
Fig. 1 is the turbo flow meter structural representation that the utility model embodiment provides;
Fig. 2 is the enlarged drawing of I in the turbo flow meter that provides of the utility model embodiment;
Fig. 3 is the enlarged drawing of II in the turbo flow meter that provides of the utility model embodiment;
Fig. 4 is the structural representation of the impeller that the utility model embodiment provides;
In figure, 1 housing, 2 mozzles, 3 spacers, 4 after-poppets, 5 gauge outfits, 6 sensors, 7 clamp nuts, 8 fore-stocks, 9 impellers, 10 sliding bearings, 11 axle sleeves, 12 axles.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Fig. 1 and Fig. 2 and Fig. 3, a kind of turbo flow meter, comprise housing 1, on the impeller 9 be placed in housing 1, housing 1 position of corresponding impeller 9 be provided with sensor 6 and install gauge outfit 5, through impeller 9 axle 12 and be fixed on be positioned at impeller 9 both sides in housing 1 passage fore-stock 8 and after-poppet 4, the passway at housing 1 two ends is provided with clamp nut 7, for pipe laying and fixing fore-stock 8 and after-poppet 4, two ends in passage arrange mozzle 2, are provided with spacer 3 between mozzle 2 and the inwall of passage.The two ends of axle 12 are fixed on fore-stock 8 and after-poppet 4 by axle sleeve 11, are provided with sliding bearing 10 between impeller 9 and axle 12.Axle 12 is fixed as one with fore-stock 8 and after-poppet 4, and impeller 9 is at axle
12when being rotated by sliding bearing, axle maintains static.Forward and backward axle sleeve adopts different tolerance, easily assembles, and not easily violates card during running.
As shown in Figure 4, the impeller that the utility model turbo flow meter adopts is two panels blade, and the pitch angle alpha will of blade is 30 °, and the length L of impeller is set to 1/2 length of helical pitch.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (3)
1. a low discharge turbo flow meter, is characterized in that, comprises housing, the position of corresponding impeller on the impeller (9) be placed in housing, housing
arrangehave sensor and install gauge outfit, through impeller axle and be fixed in shell channel be positioned at impeller both sides fore-stock and after-poppet, the passway at housing two ends is provided with clamp nut, for pipe laying and fixing fore-stock and after-poppet, two ends in passage arrange mozzle, spacer is provided with between mozzle and the inwall of passage, the two ends of axle are fixed on fore-stock and after-poppet by axle sleeve, are provided with sliding bearing between impeller and axle.
2. according to turbo flow meter according to claim 1, it is characterized in that, axle and fore-stock and after-poppet are fixed as one, and impeller is when axle is rotated by sliding bearing, and axle maintains static.
3. according to turbo flow meter according to claim 1, it is characterized in that, described impeller comprises two panels blade, and the pitch angle alpha will of blade is 28 ° ~ 32 °, and the length L of impeller is set to 1/2 length of helical pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520022873.2U CN204421970U (en) | 2015-01-14 | 2015-01-14 | A kind of low discharge turbo flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520022873.2U CN204421970U (en) | 2015-01-14 | 2015-01-14 | A kind of low discharge turbo flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204421970U true CN204421970U (en) | 2015-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520022873.2U Active CN204421970U (en) | 2015-01-14 | 2015-01-14 | A kind of low discharge turbo flow meter |
Country Status (1)
| Country | Link |
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| CN (1) | CN204421970U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441465A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Turbine flowmeter |
| CN107024248A (en) * | 2017-05-27 | 2017-08-08 | 南京保立隆包装机械有限公司 | Liquid turbine flowmeter with ceramic spacer |
| CN116182960A (en) * | 2023-03-23 | 2023-05-30 | 福建哈德仪表有限公司 | Fluid turbine flowmeter with swirl guide body |
-
2015
- 2015-01-14 CN CN201520022873.2U patent/CN204421970U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441465A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Turbine flowmeter |
| CN106441465B (en) * | 2016-09-18 | 2019-04-09 | 中国核动力研究设计院 | A kind of turbine flowmeter |
| CN107024248A (en) * | 2017-05-27 | 2017-08-08 | 南京保立隆包装机械有限公司 | Liquid turbine flowmeter with ceramic spacer |
| CN116182960A (en) * | 2023-03-23 | 2023-05-30 | 福建哈德仪表有限公司 | Fluid turbine flowmeter with swirl guide body |
| CN116182960B (en) * | 2023-03-23 | 2024-03-08 | 福建哈德仪表有限公司 | Gas turbine flowmeter with swirl guide body |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |