CN209355999U - A kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld - Google Patents
A kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld Download PDFInfo
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- CN209355999U CN209355999U CN201920141428.6U CN201920141428U CN209355999U CN 209355999 U CN209355999 U CN 209355999U CN 201920141428 U CN201920141428 U CN 201920141428U CN 209355999 U CN209355999 U CN 209355999U
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Abstract
A kind of nozzle-type differential pressure flowmeter the utility model proposes shell without circumferential butt weld, flowmeter is by pressure-bearing shell pipe, nozzle, nozzle upstream and downstream pressure measuring unit, the part such as nozzle locating sleeve forms, the utility model proposes a kind of nozzle-type differential pressure flowmeter of shell without circumferential butt weld and traditional nozzle-type differential pressure flowmeter the difference is that its nozzle is located and fixed in pressure-bearing shell pipe by locating sleeve, conventional spout formula differential pressure flowmeter is overcome because there is the circumferential butt weld for being not available for ray detection or ultrasound examination, and weld seam bearing capacity and the unmatched drawback of pressure-bearing shell pipe；The utility model proposes a kind of shell meet requirement as defined in market surpervision general bureau without the nozzle-type differential pressure flowmeter of circumferential butt weld.
Description
Technical field
The utility model relates to fluid flow rate measurement apparatus technical fields more particularly to a kind of shell without circumferential butt weld
Nozzle-type differential pressure flowmeter.
Background technique
The measuring principle of differential pressure flowmeter: according to hydrodynamics rule, when fluid is through nozzle or orifice plate in piping,
Because the fluid of nozzle or orifice plate is same by aperture and internal diameter of the pipeline, fluid flow rate changes, by nozzle or orifice plate it is upper,
Downstream side generates static pressure difference, by measuring the static pressure difference and according to the factors such as the characteristic of streaming flow and the use condition of flowmeter
Calculate the flow of fluid.
The nozzle of existing nozzle meter generally uses welding manner or pin connection mode to connect with pressure-bearing shell pipe, such as
Shown in Fig. 3 and Fig. 4, there is serious safety in the pin connection in welding structure or Fig. 4+plug welding structure in either Fig. 3
Risk: 1) weld seam can not carry out ray detection and ultrasound examination, can not judge there is the welding defect allowed invariably in weld seam；2)
Throat depth is significantly lower than shell tube thickness, and the bearing capacity of weld seam is insufficient；3) root of weld easily occurs lack of penetration and unmelted
The high risks welding defects such as conjunction；4) there are stronger stress to concentrate for the root of weld.
Utility model content
In view of this, the nozzle-type differential pressure flowmeter the utility model proposes a kind of shell without circumferential butt weld, it should
Kind flowmeter effectively prevents problems existing for conventional flow meters welding connection structure or pin connected construction, reduces safety
Risk.Because without pressure-bearing weld seam, safety is further increased.
The calculation formula of flow are as follows:
qm=3.14*C* ε * d2*(2*△p*ρ1)1/2/(4*(1-β4)1/2)
In formula:
qmFor mass flow；
C is efflux coefficient, the Reynolds number R with fluid flowingeWith flow qmIt is related；
ε is fluid inflatable property coefficient；
D is the throat diameter of nozzle；
△ p is the static pressure difference that measurement obtains；
ρ1For upstream pressure tap fluid density；
β=D/d, wherein D is upstream pressure tap tube inner diameter.
The pressure-bearing shell pipe of nozzle meter is pressure pipeline, and Intensity Design should be by the pressure that it bears and using temperature
Degree carries out Intensity Design and material selection.
Pressure-bearing shell pipe strength design formulae:
δ≥Di*pc/([σ]t*Φ-pc)
In formula: δ-pressure-bearing shell thickness of pipe wall, mm；
Di- pressure-bearing shell bore, mm；
Pc- design pressure；MPa
[σ]tAllowable stress at a temperature of the work of-material, Mpa；
Φ-weld joint efficiency, because using seamless steel pipe, value 1.0；
The selection of material selects carbon steel or carbon manganese steel class, Cr-Mo steel or Cr-Mo-V steel according to the operating temperature of flowmeter
Class, 9Cr1Mo or 9Cr1MoV steel steel class, austenitic stainless steel or austenite+ferrite dual phase steel class.
The technical solution of the utility model is achieved in that the utility model provides a kind of shell without circumferential butt welding
The nozzle-type differential pressure flowmeter of seam, including pressure-bearing shell pipe, nozzle, nozzle locating sleeve, nozzle upstream and downstream pressure measuring unit.
The nozzle passes through two pieces nozzle locating sleeve clamping position, the one end of nozzle locating sleeve far from nozzle and pressure-bearing shell pipe
Pass through fillet weld seam between inner wall.
The upstream pressure measuring unit and downstream pressure measuring unit is located at the outer of the pressure-bearing shell pipe of the upstream and downstream of nozzle
Side, the pressure tappings diameter on pressure-bearing shell pipe is identical as the connection bore of pressure measuring unit, pressure tappings through nozzle positioning pipe with
Connection inside pipeline.Coupled between the connecting tube of pressure measuring unit and pressure-bearing shell pipe with welding manner, welding point pattern meets
" pot rule " require, and Magnetic testing or Liquid penetrant testing are carried out after welding.
The technical solution of the utility model is achieved in that the utility model provides a kind of shell without circumferential butt welding
The nozzle-type differential pressure flowmeter of seam, including pressure-bearing shell pipe, nozzle and nozzle locating sleeve, the nozzle locating sleeve it is outer
Diameter, nozzle big end outer diameter are equal with the internal diameter of pressure-bearing shell pipe, and nozzle locating sleeve and nozzle big end are coaxially assemblied in pressure-bearing shell
In body pipe, and nozzle is positioned and secured in pressure-bearing shell pipe by nozzle locating sleeve.
On the basis of above technical scheme, the nozzle locating sleeve is welded and fixed with pressure-bearing shell pipe.
On the basis of above technical scheme, there are two the nozzle locating sleeve settings, nozzle big end two sides difference
Fixation is held by two locating sleeves.
It further include nozzle upstream pressure measuring unit and nozzle downstream pressure measuring unit on the basis of above technical scheme, it is described
Nozzle upstream pressure measuring unit and nozzle downstream pressure measuring unit are fixedly mounted on the outside of pressure-bearing shell pipe and spray respectively with two
It is interconnected on the inside of mouth locating sleeve.
On the basis of above technical scheme, the one end of described two locating sleeves far from nozzle and pressure-bearing shell pipe are welded
It is fixed.
On the basis of above technical scheme, the material of the pressure-bearing shell pipe is carbon steel, carbon manganese steel, Cr-Mo low-alloy
In steel, Cr-Mo-V low-alloy steel, 9Cr1Mo steel, 9Cr1MoV steel, austenitic stainless steel or austenite-ferrite two phase stainless steel
One kind.
The nozzle is one of long-radius nozzle, ISA1932 nozzle or Venturi nozzle.
For convenience of the assembly of nozzle, first nozzle locating sleeve can also be welding as one with nozzle, and weld reinforcement is ground off
It is whole again afterwards to be assembled with pressure-bearing shell.
Weld seam is non-between weld seam, nozzle locating sleeve and nozzle between nozzle locating sleeve and pressure-bearing shell pipe in this programme
Pressure-bearing weld seam, can be without non-destructive testing, when this pipe of pressure-bearing is the low conjunction of Cr-Mo when pressure-bearing shell pipe is carbon steel or carbon manganese steel
Jin Gang or Cr-Mo-V low-alloy steel, 9Cr1Mo steel or 9Cr1MoV steel, when austenite+ferritic steel, Ying Jinhang Magnetic testing or
Liquid penetrant testing should carry out Liquid penetrant testing when for austenitic steel.
Heat treatment requirements after the completion of the flowmeter manufacture of this programme are according to selected material and throat depth according to " pot
Rule " regulation determination.
A kind of nozzle-type differential pressure flowmeter of the shell provided by the utility model without circumferential butt weld is in thermal power plant
Or nuclear power plant steam flow measurement, the measurement of fluid flow of petroleum gas and chemical industry, urban public pressure pipeline fluid
Flow measurement, metallurgy and mine pressurized fluid conveyance conduit measurement of fluid flow and other pressure pipeline measurements of fluid flow field
Application.
The nozzle-type differential pressure flowmeter of the utility model and its application have the advantages that compared with the existing technology
(1) the utility model overcome traditional welding structure nozzle differential pressure flowmeter circumferential direction butt weld because root exist compared with
Strong stress concentrates, the existing peace that can not carry out ray detection or ultrasound examination and throat depth lower than pressure-bearing shell tube thickness
Full blast danger, entire pressure-bearing shell pipe is without circumferential butt weld, also there is no concern that security risk caused by welding quality；
(2) the utility model proposes a kind of nozzle-type differential pressure flowmeter of shell without circumferential butt weld it is simple, save
Circumferential butt weld and the non-destructive testing of weld seam work, decline compared with traditional flowmeter cost.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of lateral sectional view of embodiment of the utility model nozzle meter；
Fig. 2 is a kind of lateral sectional view of embodiment of the utility model nozzle meter；
Fig. 3 is a kind of cross-sectional view of embodiment of prior art nozzle meter；
Fig. 4 is a kind of cross-sectional view of embodiment of prior art nozzle meter.
In figure: under 1- pressure-bearing shell pipe, 2- nozzle, 3- nozzle locating sleeve, 4- nozzle upstream pressure measuring unit, 5- nozzle
Trip pressure measuring unit,
Specific embodiment
Below in conjunction with the utility model embodiment, the technical solution in the utility model embodiment is carried out clear
Chu is fully described by, it is clear that and described embodiment is only a part of embodiment of the utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work
Under the premise of every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, in a specific embodiment, a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld,
Including pressure-bearing shell pipe 1, nozzle 2 and nozzle locating sleeve 3, upstream pressure measuring unit and downstream pressure measuring unit.Nozzle locating sleeve 3
It is coaxially assemblied in pressure-bearing shell pipe 1 with nozzle 2, there are two the nozzle locating sleeves 3, the big end two sides difference of nozzle 2
By two 3 clamping positions of locating sleeve and fixation, upstream pressure measuring unit 4 and downstream pressure measuring unit 5 are fixedly mounted on pressure-bearing shell
The outside of body pipe 1, post-processing is welded and fixed in nozzle locating sleeve in the pressure port on pressure-bearing shell pipe, and drills to pipeline
Portion makes pressure measuring unit and fluids within pipes form access.Upstream pressure measuring unit 4, the connecting tube of downstream pressure measuring unit 5 and pressure-bearing shell
Body pipe is coupled with welding manner, and Magnetic testing is carried out after welding.
Upstream pressure measuring unit 4 and downstream pressure measuring unit 5 are respectively used to the Fluid pressure of measurement nozzle upstream and downstream, pass through
The pressure difference and tube body of fluid, the related geometric dimension of nozzle and fluid property data etc. can calculate the flow of fluid.
2 big end two sides of nozzle are gripped using nozzle locating sleeve 3.Nozzle can effectively be solved using such mode
The unreachable problem of the welding of installation position.
The nozzle 2 is one of long-radius nozzle, ISA1932 nozzle or Venturi nozzle.
The material of the pressure-bearing shell pipe 1 and nozzle 2 be carbon steel, carbon manganese steel, low alloy Cr Mo steel, Cr-Mo-V steel,
One of 9Cr1Mo steel, 9Cr1MoV steel, austenitic stainless steel or austenite-ferrite two phase stainless steel.
Thickness according to pressure-bearing shell pipe, the material classification of nozzle and attachment weld etc. by " pot rule " regulation determine whether into
Row heat treatment.
Flowmeter is provided to carry out pressure testing by " pot rule " after manufacturing.
Fig. 2 is another embodiment of flowmeter installation.
To reduce by 2 installation difficulty of nozzle and improving installation accuracy, casing 3 and nozzle 2 first can be packed into pressure-bearing shell pipe 1
It is before integrally welded, weld reinforcement is polished after welding, is then reloaded into pressure-bearing shell pipe 1.Such weld seam is non-pressure weldering
Seam, it is not necessary to carry out non-destructive testing.The foregoing is merely the better embodiments of the utility model, not to limit this reality
With novel, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all include
It is within the protection scope of the utility model.
Claims (7)
1. a kind of nozzle-type differential pressure flowmeter of shell without circumferential butt weld, which is characterized in that including pressure-bearing shell pipe (1),
Nozzle (2) and nozzle locating sleeve (3), outer diameter, nozzle big end outer diameter and the pressure-bearing shell pipe of the nozzle locating sleeve (3)
(1) internal diameter is identical, and nozzle locating sleeve (3) and nozzle (2) big end are coaxially assemblied in pressure-bearing shell pipe (1), and pass through spray
Nozzle (2) is positioned and secured in pressure-bearing shell pipe (1) by mouth locating sleeve (3).
2. a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld as described in claim 1, which is characterized in that institute
Nozzle locating sleeve (3) is stated to be welded and fixed with pressure-bearing shell pipe (1).
3. a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld as described in claim 1, which is characterized in that institute
It states there are two nozzle locating sleeve (3) settings, nozzle (2) big end two sides are gripped by two locating sleeves (3) respectively.
4. a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld as claimed in claim 3, which is characterized in that also
Including nozzle upstream pressure measuring unit (4) and nozzle downstream pressure measuring unit (5), under the nozzle upstream pressure measuring unit (4) and nozzle
Trip pressure measuring unit (5) be fixedly mounted on the outside of pressure-bearing shell pipe (1) and respectively with phases on the inside of two nozzle locating sleeves (3)
It is intercommunicated.
5. a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld as claimed in claim 3, which is characterized in that institute
Two locating sleeves (3) are stated to be welded and fixed far from the one end of nozzle (2) with pressure-bearing shell pipe (1).
6. a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld as described in claim 1, which is characterized in that institute
State pressure-bearing shell pipe (1) material be carbon steel, carbon manganese steel, Cr-Mo low-alloy steel, Cr-Mo-V low-alloy steel, 9Cr1Mo steel,
One of 9Cr1MoV steel, austenitic stainless steel or austenite-ferrite two phase stainless steel.
7. a kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld as described in claim 1, which is characterized in that institute
Stating nozzle (2) is one of long-radius nozzle, ISA1932 nozzle or Venturi nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920141428.6U CN209355999U (en) | 2019-01-25 | 2019-01-25 | A kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920141428.6U CN209355999U (en) | 2019-01-25 | 2019-01-25 | A kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld |
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| CN209355999U true CN209355999U (en) | 2019-09-06 |
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| CN201920141428.6U Active CN209355999U (en) | 2019-01-25 | 2019-01-25 | A kind of nozzle-type differential pressure flowmeter of the shell without circumferential butt weld |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111015120A (en) * | 2019-12-26 | 2020-04-17 | 安为机电设备制造(上海)有限公司 | Production method of differential pressure type flowmeter |
-
2019
- 2019-01-25 CN CN201920141428.6U patent/CN209355999U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111015120A (en) * | 2019-12-26 | 2020-04-17 | 安为机电设备制造(上海)有限公司 | Production method of differential pressure type flowmeter |
| CN111015120B (en) * | 2019-12-26 | 2021-04-23 | 安为机电设备制造(上海)有限公司 | Production method of differential pressure type flowmeter |
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