CN2354112Y - Annular perforated-plate throttling device - Google Patents
Annular perforated-plate throttling device Download PDFInfo
- Publication number
- CN2354112Y CN2354112Y CN 98246556 CN98246556U CN2354112Y CN 2354112 Y CN2354112 Y CN 2354112Y CN 98246556 CN98246556 CN 98246556 CN 98246556 U CN98246556 U CN 98246556U CN 2354112 Y CN2354112 Y CN 2354112Y
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- CN
- China
- Prior art keywords
- measuring tube
- flow measurement
- measurement plate
- guide rail
- measuring
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- 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 - Lifetime
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Abstract
The utility model relates to an annular perforated-plate throttling device, which is characterized in that a guide track which is vertical to a pipe wall is arranged inside a measuring pipe, and a flow measurement plate is fixed on or connected with the guide track in a sliding mode. The flow facing surface of the flow measurement plate is a smooth plane, and at the upper and the lower measurement zones of both sides of the flow measurement plate, a measuring pressure hole communicating with an equalizing ring is arranged, which forms a mechanism of pressure measuring and equalizing. Since the flow facing surface of the flow measurement plate is a smooth, replaceable and washable plane, the range can be regulated by the replacement of the flow measurement plate when necessary. Meanwhile, due to the mechanism of pressure measuring and equalizing, the static pressure at the measuring pressure hole can be homogenized in the equalizing ring, which can reduce the influence on flow field distortion from the local resistance in the front and the rear straight pipe segments of the measuring pipe and can enhance and ensure the measurement accuracy effectively.
Description
The utility model relates to a kind of fluid flow restriction device, particularly annular orifice restriction device.
At present, both at home and abroad on the flow instrument market, the restriction device kind of selling is a lot, in recent years, once openly adopted a kind of " device is sent in the change of annular orifice flow " at home, this device mainly is that the tube wall in measuring tube upstream measurement zone and measured downstream district is provided with pressure port, and solid bluff body is fixed in the measuring tube middle part by solid central shaft and three-legged support, and guarantee their concentricity, simultaneously, the pressure port branch of upstream and catchment is clipped to distance L 1 and the L2 and the following relation of measuring tube inside diameter D maintenance of bluff body fluoran stream surface: L1=(0.8-1.2) D, L2=(0.4-0.6) D.Though this change send device easy for installation, can avoid the obstruction and the leakage of fluid, reliable operation, but, because the long-term work of flow measurement plate possibility is dirty, in the adhesiveness medium, influence mobilely although circulating face can not be piled up precipitated impurities, the pressure port place is not easy to stop up, and in the front of flow measurement plate, the back side still may be by pickup, and the time has been grown and can change the forward and backward Flow Field Distribution of flow measurement plate, because of the effluent plate is fixed, be difficult for changing, cleaning, thereby cause measuring accuracy to reduce, influence the correct selection of useful range, be difficult to guarantee higher measuring accuracy.
The purpose of this utility model is to provide a kind of annular orifice restriction device, and it can reduce the susceptibility to the forward and backward straight length of measuring tube, can improve and guarantee the flow measurement degree of accuracy effectively.
Its solution is: the measuring tube inner chamber has and measures tube wall and be the guide rail that vertical configuration is arranged, fluoran stream surface is that the flow measurement plate of smooth flat bearing support and the guide rail by its back side fixed or be slidingly connected, and with the concentric garden of measuring tube section constitution.And when being slidingly connected, the flow measurement plate moves by the elevating mechanism that links to each other with the bearing support at its back side is upper and lower, and fixedly being limited in the measuring tube centre by the position-limit mechanism that is provided with on the guide rail, it is detachable, is applicable to more dirty medium, if when fixedly connected, be applicable to not too dirty medium.Respectively be provided with at least 1 pressure port on the tube wall in measuring tube upstream measurement zone and measured downstream district, the pressure port on each measurement zone tube wall is along same circumference uniform distribution, and pressure port is communicated with grading ring through the pressure pipe, constitutes pressure balancer structure.Like this, can weaken the velocity flow profile distortion of upstream incoming flow effectively, it is the influence that shock resistance caused of straight section before the measuring tube, be beneficial to improve measuring accuracy, measuring tube upstream measurement zone L1 and measured downstream district L2 and measuring tube inside diameter D keep following relation: L1=(0.3-1.3) D, L2=(0.2-0.8) D, and the pass of flow measurement plate outside diameter d and measuring tube inside diameter D is d/D=0.6-0.9.Described upstream measurement zone L1 is the distance of flow measurement plate fluoran stream surface to the pressure port center that is adjacent; Measured downstream district L2 is the distance of the pressure port center of flow measurement backboard face to flow measurement plate fluoran stream surface.
The pressure port that is arranged on the pressure port of measuring tube upstream measurement zone and is arranged on a side measured downstream district corresponding with it is in the same axial plane, and and the residing axial plane angle of guide rail α be between 20 °-90 °.
Described elevating mechanism reaches the worm screw that is meshed with it by worm gear and constitutes, and worm gear links to each other with the flow measurement plate by the bearing support that is connected with guide rail, and worm screw is parallel with guide rail, and by support that is connected with measuring tube and protecting cover location.
The utility model mainly is: the measuring tube inner chamber has the guide rail that is the vertical configuration layout with its tube wall, fix or slidely connect dismountable flow measurement plate on the guide rail, its fluoran stream surface is unobstructed smooth flat, on the tube wall of the measuring tube upstream and downstream of flow measurement plate both sides measurement zone, pressure port is arranged, it is communicated with grading ring, constitutes pressure balancer structure.Since flow measurement plate fluoran stream surface be unobstructed smooth flat and with the concentric garden of measuring tube section constitution, can reach the geometric similarity and the dynamic similarity in the flow field, upstream of different size, easily realize " non-reality is failed to be sold at auction fixed ", measuring accuracy when helping improving the more dirty medium of measurement, and can select the useful range that gears to actual circumstances effectively by means of transposing flow measurement plate.Again owing to adopt pressure balancer structure, it can be the static pressure in pressure port cross section of living in, in grading ring tube cavity " homogenizing ", before can weakening measuring tube, the influence that the shock resistance stream field causes distortion to bring in the back straight length, can reduce and measure the susceptibility of forward and backward straight length resistance situation, thereby can improve and guarantee measuring accuracy effectively surveying pipe.
Embodiment of the present utility model is described in detail in conjunction with the accompanying drawings.
Fig. 1 is embodiment 1, the structural front view of annular orifice restriction device.
Fig. 2 is the A-A cut-open view among Fig. 1.
Fig. 3 is embodiment 2, the structural front view of annular orifice restriction device.
Embodiment 1:
Among Fig. 1, Fig. 2, guide rail (3) radially passes the measuring tube (8) of flange, and arrange with the vertical configuration that axially is of measuring tube (8), and the internal chamber wall of an end of guide rail (3) and measuring tube (8) welds, and the other end passes protecting cover (14) and the support (10) that is connected on the measuring tube (8).Fluoran stream surface is that the flow measurement plate (1) of smooth flat is slidingly connected with guide rail (3) by the bearing support (2) that is fixedly connected on its back side, and by the position-limit mechanism that is connected on the guide rail (3), flow measurement plate (1) is limited in the center of measuring tube (8).On bearing support (2), be fixedly connected with worm gear (5), it is meshed with radially penetrating in the measuring tube (8) and be the worm screw (7) that parallel shape arranges with guide rail (3), and support (10) and protecting cover (14) location of worm screw (7) by being connected with measuring tube (8), constitute elevating mechanism, capping (11) is fixedly connected on the tube wall of measuring tube (8) of support (10) and protecting cover (14) present position.The flow measurement plate is detachable.On the tube wall of measuring tube upstream and downstream measurement zone L1, the L2 of flow measurement plate (1) both sides, respectively be provided with 4 pressure ports (15), (6), the pressure port of every side is along same circumference uniform distribution and symmetrical, and be communicated with grading ring (13), (4) through pressure pipe (12), (9) respectively, constitute pressure balancer structure.And the pressure port (15), (6) that are positioned on the tube wall of homonymy measuring tube upstream and downstream are in same axial plane, and with guide rail (3) and the formed angle α of the residing axial plane of worm screw (7) be 45 °.The measured downstream district L2 of flow measurement plate (1) fluoran stream surface to the upstream measurement zone L1 of the distance at pressure port (15) center and flow measurement plate (1) fluoran stream surface to the distance at pressure port (6) center, keep following relation: L1=1.2D with measuring tube (8) inside diameter D, L2=0.8D, and the pass between the inside diameter D of the outside diameter d of flow measurement plate (1) and measuring tube (8) is d/D=0.7.
Embodiment 2:
Among Fig. 3, guide rail (3) is positioned at measuring tube (8), becomes the vertical configuration welding with the internal chamber wall of measuring tube (8), and fluoran stream surface is that the flow measurement plate (1) of smooth flat is fixedlyed connected with guide rail (3) by the bearing support (2) that is fixedly connected on its back side, and is non-dismountable.Other is all with embodiment 1.
When fluid flows into measuring tube (8) and process flow measurement plate (1) annular space, under the choked flow effect of flow measurement plate (1), downstream fluid static pressure pressure is descended.Fluid is successively by the pressure port (15) of measuring tube (8) upstream measurement zone and the pressure port (6) and the pressure pipe (9) in pressure pipe (12) and measured downstream district, obtain static pressure, converge respectively to grading ring (13) and (4) interior " homogenizing ", obtain average static pressure, the average static pressure that upstream and downstream measurement zone pressure ports (15), (6) are located is sent to differential pressure transmitter (16) by positive and negative pressure guiding pipe respectively, convert electric signal to by differential pressure transmitter (16), and by Displaying Meter demonstration fluid flow, thereby reach the purpose of measuring flow.If measure more dirty rate-of flow, when needing replacing or cleaning flow measurement plate (1), take off capping (11), take protecting cover (14) apart, turn worm screw (7) is risen flow measurement plate (1) along guide rail (3), can take out flow measurement plate (1).
Claims (4)
1, a kind of annular orifice restriction device, comprise measuring tube and be positioned at its flow measurement plate, it is characterized in that, measuring tube (8) inner chamber has the guide rail (3) that is vertical configuration with the measuring tube tube wall, fluoran stream surface is that the bearing support (2) of flow measurement plate (1) by its back side of smooth flat is fixing or be slidingly connected with guide rail (3), and with measuring tube (8) section constitution concentric circles, on the tube wall of measuring tube (8) upstream measurement zone L1 and measured downstream district L2, respectively be provided with at least 1 pressure port (15), (6), pressure port on each measurement zone tube wall is along same circumference uniform distribution, pressure port (15), (6) be communicated with grading ring (13) and (4) by pressure pipe (12) and (9) respectively, constitute pressure balancer structure, and measuring tube upstream measurement zone L1 and measured downstream district L2 and the following relation of measuring tube (8) inside diameter D maintenance, L1=(0.3-1.3) D, L2=(0.2-0.8) D, the pass of flow measurement plate outside diameter d and measuring tube inside diameter D is d/D=0.6-0.9.
2, annular orifice restriction device as claimed in claim 1, it is characterized in that the flow measurement plate (1) that is slidingly connected with guide rail (3) links to each other with elevating mechanism by connected bearing support (2), and go up the middle part that the position-limit mechanism that is provided with is limited in measuring tube (8) by guide rail (3).
3, annular orifice restriction device as claimed in claim 1, the pressure port (6) that it is characterized in that being arranged on the pressure port (15) of measuring tube upstream measurement zone L1 and be arranged on a side measured downstream district L2 corresponding with it is in the same axial plane, and and the residing axial plane angle of guide rail (3) α be 20 °--between 90 °.
4, annular orifice restriction device as claimed in claim 1 or 2, it is characterized in that described elevating mechanism reaches the worm screw (7) that is meshed with worm gear (5) by worm gear (5) and constitutes, and worm gear (5) links to each other with flow measurement plate (1) by the bearing support (2) that is connected with guide rail (3), worm screw (7) is parallel shape with guide rail (3) arranges, and by support (10) that is connected with measuring tube (8) and protecting cover (14) location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98246556 CN2354112Y (en) | 1998-11-30 | 1998-11-30 | Annular perforated-plate throttling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98246556 CN2354112Y (en) | 1998-11-30 | 1998-11-30 | Annular perforated-plate throttling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2354112Y true CN2354112Y (en) | 1999-12-15 |
Family
ID=33991976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98246556 Expired - Lifetime CN2354112Y (en) | 1998-11-30 | 1998-11-30 | Annular perforated-plate throttling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2354112Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148978A (en) * | 2013-02-04 | 2013-06-12 | 扬州大学 | Even pressure sleeve for measurement of static pressure of pipeline fracture surface |
| CN108414041A (en) * | 2018-04-27 | 2018-08-17 | 湖北新冶钢特种钢管有限公司 | A kind of annular perforated-plate throttling device and its pressure method for discharging pollution |
| CN110763394A (en) * | 2019-10-21 | 2020-02-07 | 华北电力大学 | Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site |
-
1998
- 1998-11-30 CN CN 98246556 patent/CN2354112Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148978A (en) * | 2013-02-04 | 2013-06-12 | 扬州大学 | Even pressure sleeve for measurement of static pressure of pipeline fracture surface |
| CN108414041A (en) * | 2018-04-27 | 2018-08-17 | 湖北新冶钢特种钢管有限公司 | A kind of annular perforated-plate throttling device and its pressure method for discharging pollution |
| CN110763394A (en) * | 2019-10-21 | 2020-02-07 | 华北电力大学 | Annular pressure measuring device for liquid differential pressure measurement in vertical round pipe in experimental site |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |