CN2265529Y - Orifice flowmeter - Google Patents
Orifice flowmeter Download PDFInfo
- Publication number
- CN2265529Y CN2265529Y CN 96200955 CN96200955U CN2265529Y CN 2265529 Y CN2265529 Y CN 2265529Y CN 96200955 CN96200955 CN 96200955 CN 96200955 U CN96200955 U CN 96200955U CN 2265529 Y CN2265529 Y CN 2265529Y
- Authority
- CN
- China
- Prior art keywords
- indicator
- throttling element
- orifice
- flow
- glass rotameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model relates to an orifice flowmeter which is mainly composed of a throttling element and an indicator. Because the orifice plate type throttling element is connected with the indicator, the medium flow in a main pipe is measured via the split flow quantity value measured by a glass rotameter in the indicator and a nozzle arranged at the lower end of the glass rotameter according to the size of the spilt flow quantity and the proportional relationship between the nozzle and the initial hole diameter of an orifice plate; thus, the utility model has the advantages of large measurement range degree, simple structure, and low cost, and can be used for measuring a large diameter pipeline and a large flow quantity. The indicator has the advantages that the indicator can be flushed by fluid continuously, has no seal liquid or other intermediate sections and can be installed omnibearingly, with reliable work and direct reading, etc.
Description
The utility model relates to a kind of flow instrument, particularly a kind ofly is used for measuring the orifice-type flowmeter that is full of round section pipeline liquid or gas medium instantaneous delivery.
Its measure portion of existing glass rotameter mainly is made up of the float in a vertically arranged glass tapered tube and the pipe.The big end of tapered tube upwards, float is with the flow size, along on the axis direction, move down, flowmeter is directly installed in the trunk line, when medium passes through tapered tube from bottom to top, the raising force that acts on float is during greater than the float weight that is immersed in the medium, annular space area between float maximum outside diameter and the tapered tube increases with the rising of float, the flow velocity of medium also descends immediately, the raising force that acts on float also reduces gradually, when raising force equaled float and is immersed in weight in the medium, float just was stabilized on a certain height, at this moment just can directly read flow value from the tapered tube scale.Advantages such as that though this flowmeter has is simple in structure, price is low, maintenance, easy to use, direct reading, but since the glass tapered tube can not do too big, so can only produce the more small-bore flowmeter of φ 3-φ 100mm, measurable flow range is also less, and (the liquid maximum flow is 40m
3/ h, the gas maximum flow is 1000m
3/ h).In addition, the glass tapered tube of larger caliber flowmeter is during use, under quick-opening valve door or the flow situation that change is big suddenly, because its float is big, Heavy Weight, glass tube is very easily crashed by float, must vertical install again in addition, so that its range of application be restricted.And existing restriction flowmeter, it is the orifice plate that is provided with between two ring casings of front and back in the throttling element in the trunk line by being installed in, cause throttling in the pipeline that medium is circulated, on orifice plate, the static pressure that the both sides, downstream produce is poor, utilize the funtcional relationship between static pressure difference and the flow to obtain flow by the differential pressure that the secondary instrument differential pressure gauge records, though it can be used for the measurement of large diameter pipeline and big flow, but because this flowmeter needs in strict accordance with requiring equipped evener between connecting pipe that connects on two ring casings and differential pressure gauge, condenser, isolator, could operate as normal behind the annex such as connecting pipe and valve and when measuring Korrosionsmedium for preventing that damaging differential pressure gauge also will use spacer pad throttling element and differential pressure gauge isolation, so it is complex structure not only, maintenance difficult, cost an arm and a leg, and its rangeability less (being generally 3), and the medium that every flowmeter all will provide according to the user, pipeline, pressure, after data such as temperature are calculated, just can produce, certain limitation also be arranged so use.
The purpose of this utility model is to provide a kind of orifice-type flowmeter, and it is not only simple in structure, reliable operation, directly reading, convenient maintenance, also can comprehensively install, and is used for the measurement of large diameter pipeline and big flow.
Its solution is: reach the indicator two parts that are connected with the orifice-plate type throttling element by the orifice-plate type throttling element and constitute; the upstream of throttling element and downstream are provided with two ring casings; two ring casing pore chamber walls are provided with annular space; two pressure ports are communicated with two ring casings respectively on the throttling element; an end of shunt conduit is connected with the pressure port that is positioned at the upstream in the indicator; the other end is connected with glass rotameter lower end in the indicator; the glass rotameter upper end is connected with the pressure port that is positioned at the downstream; be provided with a nozzle that is used to control shunt volume in the lower end of indicator glass tapered tube; the tapered tube two ends are respectively arranged with spring; when exceeding allowed band with the protection flow, float is not rushed out outside the tapered tube.
Because trunk line total flow Q=Q
1+ Q
2, throughput ratio:
(Q in the formula
1Be the indicator flow; Q
2Be the orifice plate flow; d
1Be the indicator coefficient of flow, it with the area of structure, size and the nozzle of indicator and tap hole than relevant; d
2Coefficient of flow for orifice plate; ε is a fluid stream expansion coefficient; A
1, A
2Be respectively the perforate cross-sectional area of nozzle and orifice plate; Δ p1, Δ p2 are respectively the differential pressure of glass rotameter and orifice plate.So), by the throughput ratio formula as can be known, in case orifice plate and indicator and tap hole are determined d
1, d
2, A
1, A
2Be definite value, throughput ratio is only relevant with Δ p2 with differential pressure Δ p1.Though i.e. trunk line caliber size, as long as selected maximum differential pressure value equates, just can be with the glass rotameter of same specification as indicator, and the opening diameter that only need change nozzle is with regard to the scalable shunt volume.
The utility model is owing to being connected with indicator on the orifice-plate type throttling element that is installed on the trunk line, and the nozzle that is provided with of the bypass flow value of measuring by glass rotameter in the indicator and glass rotameter lower end is measured the flow of trunk line medium according to the proportional relation of opening diameter of the size of shunt volume and nozzle and orifice plate, so it has measurement range degree big (maximum can reach 10), (bore is φ 25mm-φ 500mm, and the upper flow quantity of fluid is 3300m to the maximum to can be used for the measurement of large diameter pipeline and big flow
3/ h, gas is 36000m to the maximum
3/ h), simple in structure, cheap, indicator is sustainable by fluid flushing, no sealing liquid or other center section, reliable operation, direct reading, and advantage can comprehensively be installed etc.
The utility model embodiment is described in detail in conjunction with the accompanying drawings:
Fig. 1 is the utility model structural front view.
Fig. 2 is the utility model structure side view.
Fig. 3 is that the A of the utility model Fig. 2 is to view.
Present embodiment is a liquid flowmeter.
Fig. 1, Fig. 2, among Fig. 3, indicator is positioned at the below of throttling element, what throttling element (22) adopted is the orifice-plate type throttling element, two pore chamber walls (36), (21) be separately positioned on the two ends in throttling element (22) upstream and downstream, form two ring casings (34), (33), throttling element (22) and two pore chamber walls (36), (21) be interference fit, throttling element orifice plate center is provided with circular hole, no chamfering simultaneously is the upstream, there is chamfering simultaneously to be the downstream, be provided with 6 annular spaces (35) on each pore chamber wall, in the throttling element with last, the pressure port (37) that following two ring casings are connected, (38) go up the two through hole that is provided with by pedestal (18) respectively and be communicated with glass rotameter in isocon (20) and the indicator, the other end of isocon (20) is communicated with the lower end of glass rotameter by pedestal (5).Isocon (20) is and is threaded with pedestal (18), (5), and the junction is provided with the pad (19) that seals.Throttling element (22), pedestal (18) are to connect by bolt (26), packing ring (27), nut (28) by flange, and be provided with two briquettings (23) in two flanges and pad (24) seals, register pin on the flange (25) works to prevent that throttling element from adorning anti-.Be provided with float (12) in the glass rotameter in the glass tapered tube (11), the tapered tube two ends are respectively arranged with spring (10), (14), and be interference fit between tapered tube inwall and spring external diameter, be provided with back-up ring (17), airtight and watertight padding (16) and gland (15) between the big end of tapered tube (11) and the pedestal (18).Be provided with nozzle (6) between small end and the pedestal (5); pad (7); airtight and watertight padding (8) and gland (9); gland (15) and (9) are respectively by bolt (29) and packing ring (30); bolt (31) and packing ring (32) are connected on pedestal (18) and the pedestal (5); make gland compress airtight and watertight padding and play sealing function; and between two glands, be set with sleeve pipe (13) outside the tapered tube; in order to the protection tapered tube; sleeve pipe (13) is provided with the reading window, passes through bolt (2) in the bottom of pedestal (5); packing ring (3) is connected with a bottom (1) so that install and clean during maintenance parts and blowdown.Be provided with gasket seal (4) between bottom (1) and the pedestal (5).
Under the duty, medium produces differential pressure by orifice plate, under this differential pressure effect, the part medium is shunted by isocon and is flowed in the glass rotameter through nozzle, because of the opening diameter of the size of shunt volume and nozzle and orifice plate proportional, so can read the flow value of trunk line medium by the bypass flow that glass rotameter is measured.
In addition then: but this orifice-type flowmeter both level install, also can vertically install, but no matter adopt which kind of mounting means, the glass tapered tube will guarantee all that big end is upwards vertical and installs in the indicator.And the indicator that is used for measuring the orifice-type flowmeter of liquid generally speaking should be positioned at the below of throttling element, and the indicator that is used for the orifice-type flowmeter of measurement gas should be positioned at the top of throttling element.
Claims (3)
1, a kind of orifice-type flowmeter, it is characterized in that comprising throttling element (22) and indicator two parts, the upstream of throttling element (22) and downstream are provided with two ring casings (34), (33), two ring casing pore chamber walls (36), (21) be provided with annular space (35) on, last two pressure ports of throttling element (22) (37), (38) be communicated with two ring casings respectively, one end of isocon in the indicator (20) is connected with the pressure port that is positioned at the upstream, the other end is connected with glass rotameter lower end in the indicator, glass rotameter upper end is connected with the pressure port that is positioned at the downstream (38), is provided with a nozzle (6) that is used to control shunt volume in the lower end of indicator glass tapered tube (11).
2, orifice-type flowmeter according to claim 1 is characterized in that the two ends of tapered tube (11) are respectively arranged with spring (14), (10).
3, orifice-type flowmeter according to claim 1 and 2 is characterized in that the bottom of glass rotameter and shunt conduit lower end pedestal (5) is provided with a bottom (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96200955 CN2265529Y (en) | 1996-01-04 | 1996-01-04 | Orifice flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96200955 CN2265529Y (en) | 1996-01-04 | 1996-01-04 | Orifice flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2265529Y true CN2265529Y (en) | 1997-10-22 |
Family
ID=33887361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96200955 Expired - Fee Related CN2265529Y (en) | 1996-01-04 | 1996-01-04 | Orifice flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2265529Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871803A (en) * | 2010-06-28 | 2010-10-27 | 江阴市节流装置厂有限公司 | Integrated differential-pressure-type flow meter and application method thereof |
-
1996
- 1996-01-04 CN CN 96200955 patent/CN2265529Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871803A (en) * | 2010-06-28 | 2010-10-27 | 江阴市节流装置厂有限公司 | Integrated differential-pressure-type flow meter and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |