CN207066519U - A kind of differential pressure flowmeter of internal diameter gradual change - Google Patents
A kind of differential pressure flowmeter of internal diameter gradual change Download PDFInfo
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- CN207066519U CN207066519U CN201721082615.9U CN201721082615U CN207066519U CN 207066519 U CN207066519 U CN 207066519U CN 201721082615 U CN201721082615 U CN 201721082615U CN 207066519 U CN207066519 U CN 207066519U
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Abstract
A kind of differential pressure flowmeter of internal diameter gradual change, including measurement straight tube and throttling body are the utility model is related to, throttling body is hollow revolving body, and the outer circumferential walls for the body that throttles are fixed on the inwall of measurement straight tube；Taper into the centre position of throttling body, the internal diameter for the body that throttles from one end of throttling body, become larger from the centre position of throttling body to the other end of throttling body, the internal diameter for the body that throttles；The centre position of throttling body is provided with throat's pressure port, measurement straight tube is provided with upstream pressure tappings and throat's pressure tappings, upstream pressure tappings and throttling body are set gradually along the direction of flow of fluid, and throat's pressure tappings and throat's pressure port communicate, and the inside of throat's pressure port and measurement straight tube communicates.The utility model can accurately measure the size of flow, belong to the technical field of differential pressure flowmeter.
Description
Technical field
It the utility model is related to the technical field of differential pressure flowmeter, more particularly to a kind of differential pressure flowmeter of internal diameter gradual change.
Background technology
The advantages that differential pressure flowmeter is stable and reliable for performance because its is simple in construction, firm, and price is relatively cheap, is history
One of most long, most widely used instrument.It is right as range ratio is small however, traditional restriction flowmeter has many shortcomings
The length requirement of upstream straight pipeline is higher, easy contamination, and device portal easily loses precision because of abrasion, and efflux coefficient is unstable
It is fixed etc..
Utility model content
For technical problem present in prior art, the purpose of this utility model is：A kind of difference of internal diameter gradual change is provided
Pressure type flowmeter, it can accurately measure the size of flow.
In order to achieve the above object, the utility model adopts the following technical scheme that：
A kind of differential pressure flowmeter of internal diameter gradual change, including measurement straight tube and throttling body, throttling body is hollow revolving body, section
The outer circumferential walls of fluid are fixed on the inwall of measurement straight tube；From one end of throttling body to the centre position of throttling body, throttle body
Internal diameter taper into, from the centre position of throttling body to the other end of throttling body, the internal diameter for the body that throttles becomes larger；Throttle body
Centre position be provided with throat's pressure port, measurement straight tube is provided with upstream pressure tappings and throat's pressure tappings, upstream pressure tappings and section
Fluid is set gradually along the direction of flow of fluid, and throat's pressure tappings and throat's pressure port communicate, and throat's pressure port and measurement are straight
The inside of pipe communicates.
It is further：The both ends of measurement straight tube are provided with annular flange.
It is further：Throat's pressure tappings are a through hole on measurement straight tube, the center line of throat's pressure tappings and throat
The center line of pressure port is on same straight line.
It is further：Measure and be equipped with annular projection at the upstream pressure tappings and throat's pressure tappings of straight tube.
It is further：Measure and be equipped with wearing layer on the inwall of straight tube and the inwall of throttling body.
It is further：Manograph is equipped with upstream pressure tappings and throat's pressure tappings.
Generally speaking, the utility model has the following advantages that：
The utility model can more accurately measure the size of flow, and its is simple in construction, convenient installation cleaning, be not easy rotten
Erosion and damage, anti-bulky grain block.The combination for measuring straight tube and the body that throttles is put down as primary structure of the present utility model, throttling body
The sliding tapered and profile of smooth flaring so that do not have whirlpool during fluid stream warp knuckle fluid, do not produce energy loss, therefore pressure is damaged
Lose low, energy consumption is small.Throttling body does not have wedge angle, and not easy to wear, wearing layer can improve the life-span of flowmeter.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Wherein, 1 is measurement straight tube, and 2 be throttling body, and 3 be annular flange, and 4 be upstream pressure tappings, and 5 be throat's pressure tappings, 6
It is annular projection for throat's pressure port, 7.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
With reference to shown in Fig. 1, a kind of differential pressure flowmeter of internal diameter gradual change, including measurement straight tube and throttling body.During throttling body is
Empty revolving body, the outline for the body that throttles is cylinder, and the outer circumferential walls for the body that throttles are fixed on the inwall of measurement straight tube, throttling
Body can be bolted on measurement straight tube, and throttling body can also be pasted onto on measurement straight tube, each footpath for the body that throttles
To section, the inwall for the body that throttles is circle, and radial section is that section is vertical with the axis for the body that throttles.From one end of throttling body
(left end) tapers into the centre position of throttling body, the internal diameter for the body that throttles, from the centre position of throttling body to the another of throttling body
One end (right-hand member), the internal diameter for the body that throttles become larger.The centre position of throttling body is provided with throat's pressure port, i.e., in the body that throttles
Between position open a through hole, measurement straight tube is provided with upstream pressure tappings and throat's pressure tappings, upstream pressure tappings and throttle body along
The direction of flow of fluid is set gradually, and upstream pressure tappings communicate in the left end of body that throttles, throat's pressure tappings and throat's pressure port, larynx
The inside of portion's pressure port and measurement straight tube communicates.
The both ends of measurement straight tube are provided with annular flange.Measurement straight tube conveniently can be arranged on other pipelines by annular flange,
If a Pipe installing is in the left end of measurement straight tube, right-hand member of another Pipe installing in measurement straight tube.
Throat's pressure tappings are a through hole on measurement straight tube, the center line of throat's pressure tappings and the center of throat's pressure port
Line is on same straight line.Convenient processing, in processing, a secondary aperture is bored, that is, processed throat's pressure tappings on measurement straight tube
With throat's pressure port on throttling body.
Measure and be equipped with annular projection at the upstream pressure tappings and throat's pressure tappings of straight tube.Upstream can be sealed up with lid to take
Press mouth and throat's pressure tappings.
Measure and be equipped with wearing layer on the inwall of straight tube and the inwall of throttling body.Because fluid has certain viscosity, apply
Upper wearing layer, it is possible to reduce friction of the fluid to measurement straight tube inwall, increase the life-span of flowmeter.
Manograph is equipped with upstream pressure tappings and throat's pressure tappings.Upstream pressure tappings and larynx can be obtained using manograph
The pressure of fluid at portion's pressure port, fluid continuity equation and fluid Bernoulli equation is then recycled to calculate outflow.
Liquid is sticking, and when liquid flows, certain energy will be lost in viscous drag, and this energy loss is shown as
The pressure loss.The energy conversion of loss is heat, raises fluid temperature (F.T.).Liquid is divided into two in the pressure loss caused by flowing
Kind, along stroke pressure loss and local pressure loss.Lost along stroke pressure：Liquid produces in isometrical straight Bottomhole pressure because of friction
The pressure loss.Local pressure loss：The elbow of liquid passes through conduit, joint, valve port and suddenly change section etc. when,
Because flow velocity or flow direction occur drastically change and regional area produce flow resistance caused by the pressure loss.
In order to overcome existing flow measurement accuracy of measurement not high, the pressure loss is big, and the problem of easily getting dirty, this is carried using new
A kind of flowmeter is supplied, the flowmeter can not only more accurately measure the size of flow, and simple in construction, convenient installation, subtract
The small pressure loss, is hardly damaged.
Fluid is full of pipeline, and when flowing through throttling body, because circulation area reduces, speed accelerates, and pressure diminishes, and reaches section
When in the middle part of fluid, pressure is minimum.Can by measure throttling body in the middle part of with section flow front pressure difference, with principle of conservation of energy with
The principle of continuity law is flowed, to obtain uninterrupted.The method of calculating is with other differential pressure flowmeters, such as cone flowmeter,
Differential pressure type flowmeter etc., i.e., flow is tried to achieve based on Bernoulli equation and continuity equation.The front end of throttling body is smooth for internal diameter
Tapered round pipeline, can reduce the pressure loss, improve the precision of measurement；Rear portion is divided into the round pipe of the smooth flaring of internal diameter, energy
Reduce the influence being vortexed, make efflux coefficient more stable, and the structure can play a part of unhurried current, so connection measurement straight tube
Without long, the length of preceding pipeline is the rear straight tube (being not drawn into figure) of preceding pipeline (being not drawn into figure) and connection measurement straight tube
1.5D, the length of rear pipeline is 0.5D, and D is the internal diameter of measurement straight tube.Compared to the flow of throttling element built in cone flowmeter etc.
Meter, due to that need not use extra immobilising device, structure is simpler, easy for installation, and measurement is more accurate；The utility model
The middle part communication port of throttling body is circle, and other than ring type, can reduce the influence that big spot particle blocks.
The combination of straight tube and the body that throttles is measured as primary structure of the present utility model.The body that throttles it is smooth it is tapered with it is smooth gradually
The profile of expansion so that there is no whirlpool during fluid stream warp knuckle fluid, do not produce energy loss, therefore the pressure loss is low, energy consumption is small.Section
Fluid does not have wedge angle, not easy to wear, and wearing layer can improve the life-span of flowmeter.
Above-described embodiment is the preferable embodiment of the utility model, but embodiment of the present utility model is not by above-mentioned
The limitation of embodiment, it is other it is any without departing from Spirit Essence of the present utility model with made under principle change, modify, replace
Generation, combination, simplify, should be equivalent substitute mode, be included within the scope of protection of the utility model.
Claims (6)
- A kind of 1. differential pressure flowmeter of internal diameter gradual change, it is characterised in that：Including measurement straight tube and throttling body, throttling body is hollow Revolving body, the outer circumferential walls for the body that throttles are fixed on the inwall of measurement straight tube；From one end of throttling body to the interposition of throttling body Put, the internal diameter for the body that throttles tapers into, and gradually becomes from the centre position of throttling body to the other end of throttling body, the internal diameter for the body that throttles Greatly；The centre position of throttling body is provided with throat's pressure port, and measurement straight tube is provided with upstream pressure tappings and throat's pressure tappings, upstream take Pressure mouth and throttling body are set gradually along the direction of flow of fluid, and throat's pressure tappings and throat's pressure port communicate, throat's pressure port Communicated with the inside of measurement straight tube.
- 2. according to a kind of differential pressure flowmeter of internal diameter gradual change described in claim 1, it is characterised in that：The both ends of measurement straight tube are set There is annular flange.
- 3. according to a kind of differential pressure flowmeter of internal diameter gradual change described in claim 1, it is characterised in that：Throat's pressure tappings are measurement A through hole on straight tube, the center line of throat's pressure tappings is with the center line of throat's pressure port on same straight line.
- 4. according to a kind of differential pressure flowmeter of internal diameter gradual change described in claim 1, it is characterised in that：The upstream of measurement straight tube takes Annular projection is equipped with pressure mouth and throat's pressure tappings.
- 5. according to a kind of differential pressure flowmeter of internal diameter gradual change described in claim 1, it is characterised in that：Measure straight tube inwall and Wearing layer is equipped with the inwall of throttling body.
- 6. according to a kind of differential pressure flowmeter of internal diameter gradual change described in claim 1, it is characterised in that：Upstream pressure tappings and throat Manograph is equipped with pressure tappings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721082615.9U CN207066519U (en) | 2017-08-25 | 2017-08-25 | A kind of differential pressure flowmeter of internal diameter gradual change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721082615.9U CN207066519U (en) | 2017-08-25 | 2017-08-25 | A kind of differential pressure flowmeter of internal diameter gradual change |
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| Publication Number | Publication Date |
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| CN207066519U true CN207066519U (en) | 2018-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721082615.9U Active CN207066519U (en) | 2017-08-25 | 2017-08-25 | A kind of differential pressure flowmeter of internal diameter gradual change |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111121887A (en) * | 2020-03-17 | 2020-05-08 | 艾加流体控制(上海)有限公司 | Circular wedge flowmeter |
-
2017
- 2017-08-25 CN CN201721082615.9U patent/CN207066519U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111121887A (en) * | 2020-03-17 | 2020-05-08 | 艾加流体控制(上海)有限公司 | Circular wedge flowmeter |
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