CN111982212A - Domestic double-elbow gas meter - Google Patents
Domestic double-elbow gas meter Download PDFInfo
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- CN111982212A CN111982212A CN202010873404.7A CN202010873404A CN111982212A CN 111982212 A CN111982212 A CN 111982212A CN 202010873404 A CN202010873404 A CN 202010873404A CN 111982212 A CN111982212 A CN 111982212A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a household double-elbow gas meter, which comprises an air inlet pipe, wherein the air inlet pipe is communicated with one end of a sealing cover shell, the other end of the sealing cover shell is communicated with the input end of a motor valve, the output end of the motor valve is connected with an air outlet pipe, a small-flow elbow sensor and a large-flow elbow sensor are arranged in the air inlet pipe, small-flow differential pressure transmitters are arranged on the high-low pressure taking sides of the small-flow elbow sensor, large-flow differential pressure transmitters are arranged on the high-low pressure taking sides of the large-flow elbow sensor, and a small-flow electric control valve is arranged. The invention has simple structure, firmness, reliability, small occupied space and low price. A low-range differential pressure transmitter is additionally arranged by using the principle of a double-range differential pressure flowmeter, so that the problem of low-flow differential pressure signals is solved. If the system enters the secondary meter, the operations of changing the parameters of the secondary meter, opening and closing the primary valve of the bent pipe sensor and the like can be reduced, and the system can realize full-automatic metering.
Description
Technical Field
The invention belongs to the technical field of gas meters, and relates to a household double-elbow gas meter.
Background
The elbow flowmeter is a novel flowmeter product appearing in recent decades, although the elbow flowmeter has simple structure, wide measuring range and heavy weightThe elbow flowmeter has the advantages of high resilience precision, no movable part, no additional pressure loss, short requirement on a straight pipe section, wear resistance, no maintenance, reasonable cost performance and the like, but the elbow flowmeter obtains flow measurement by utilizing the magnitude of inertial centrifugal force generated by the natural flow of a measurement medium in a pipeline, so the elbow flowmeter is a low differential pressure flowmeter compared with other differential pressure flowmeters. Particularly, the gas meter for testing natural gas enters a resident natural gas pipeline with the pressure of 200 plus 500mm water column, and the minimum flow rate of the gas meter is 0.016m3The natural gas density is 0.7174Kg/m3Left and right. The gas meter is used for testing the natural gas flow under the conditions of low pressure, low flow speed and low density, and the differential pressure signal value generated by the gas meter is relatively small, so that the difficulty of flow measurement is increased. Since it is very difficult to obtain a correct natural gas flow rate value in a low differential pressure range, mechanical gas meters have been developed for over 200 years since 1815 years ago, and at present, domestic gas meters are still mainly membrane gas meters. In recent years, some all-electronic gas meters are developed through modern technical means, but the test of the small flow of the gas meter is not satisfactory. The domestic all-electronic gas meter is mainly introduced from Japan and Europe, such as an ultrasonic domestic gas meter, and has the disadvantages of high price, high power consumption and difficult climate formation in China.
Disclosure of Invention
The invention aims to provide a household double-bent-pipe gas meter, which can solve the problem that the small flow of the gas meter is difficult to test.
According to the technical scheme provided by the invention: the utility model provides a domestic two return bend gas meters, includes the intake pipe, intake pipe intercommunication sealing cover shell one end, the sealing cover shell other end intercommunication motor valve input, the outlet duct is connected to the motor valve output, be equipped with little flow elbow sensor and large-traffic elbow sensor in the intake pipe, little flow elbow sensor's high-low pressure is got and is pressed both sides installation little flow differential pressure transmitter, large-traffic differential pressure transmitter is got to large-traffic elbow sensor's high-low pressure and is pressed both sides installation, little flow elbow sensor output installation little flow electric control valve, large-traffic electric control valve is installed to large-traffic elbow sensor output.
As a further improvement of the present invention, the intake pipe is provided with the small-flow elbow sensor and the large-flow elbow sensor in parallel, the small-flow elbow sensor and the large-flow elbow sensor have the same shape, and include a flow pipe intake section and a flow pipe exhaust section, the flow pipe intake section and the flow pipe exhaust section are smoothly connected through a circular arc-shaped flow elbow section, a graph obtained by cutting the inner surface of the inner side wall of the flow elbow section by a plane along the axial direction of the flow elbow section is a circular arc, and the outer side wall of the flow elbow section and the inner side wall of the flow elbow section are provided with a high-pressure air hole and a low-pressure air hole.
As a further improvement of the invention, internal channels of the air inlet section and the air outlet section of the flow tube are both in a cylindrical shape with the same pipe diameter, the front straight pipe section of the small-flow elbow sensor is longer than the distance 5 times the diameter of the elbow of the small-flow elbow sensor, and the rear straight pipe section of the small-flow elbow sensor is longer than the distance 3 times the diameter of the elbow of the small-flow elbow sensor; the front straight pipe section of the large-flow elbow sensor is larger than the distance 5 times of the diameter of the elbow of the large-flow elbow sensor, and the rear straight pipe section of the large-flow elbow sensor is larger than the distance 3 times of the diameter of the elbow of the large-flow elbow sensor.
As a further improvement of the invention, the flow elbow section (12) is in the shape of an 1/4 circular arc, and the ratio of the central curvature radius R of the elbow to the inner diameter d of the elbow to the curvature ratio (R/d) is between 1 and 1.5.
As a further improvement of the invention, the high-pressure air holes and the low-pressure air holes have the same aperture, and the high-pressure air holes and the low-pressure air holes are not more than 15% of the inner diameter of the bent pipe.
As a further improvement of the invention, the inlet end of the small-flow differential pressure transmitter is connected with the corresponding high-pressure air hole and low-pressure air hole on the small-flow elbow sensor, and the inlet end of the large-flow differential pressure transmitter is connected with the corresponding high-pressure air hole and low-pressure air hole on the large-flow elbow sensor.
As a further improvement of the invention, the small-flow electric control valve and the large-flow electric control valve are positioned in a sealed housing.
As a further improvement of the invention, the input end and the output end of the motor valve are at a 90-degree right angle.
As a further improvement of the invention, the pipe orifices of the gas outlet pipe and the gas inlet pipe are upward, and the gas meter is U-shaped, and the center distance of the gas meter is 130 mm.
The positive progress effect of this application lies in:
the invention has simple structure, firmness, reliability, small occupied space and low price. A low-range differential pressure transmitter is additionally arranged by using the principle of a double-range differential pressure flowmeter, so that the problem of low signal of the detected low-flow differential pressure is solved. If the system enters the secondary meter, the operations of changing the parameters of the secondary meter, opening and closing the primary valve of the bent pipe sensor and the like can be reduced, and the system can realize full-automatic metering.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In fig. 1-2, the gas meter comprises a gas outlet pipe 1, a small flow electric control valve 2, a small flow differential pressure transmitter 3, a double-elbow domestic gas meter device 4, a large flow differential pressure transmitter 5, a large flow electric control valve 6, a sealing cover 7, a motor valve 8, a gas inlet pipe 9, a flow pipe gas inlet section 10, a flow pipe gas outlet section 11, a flow elbow section 12, a flow elbow section internal side wall 13, an arc 14, a flow elbow section external side wall 15, a center line 16, a high pressure gas hole 17, a low pressure gas hole 18, and the like.
As shown in fig. 1-2, the invention relates to a household double-elbow gas meter, which comprises a gas inlet pipe 9, wherein the gas inlet pipe 9 is communicated with one end of a sealing housing 7, the other end of the sealing housing 7 is communicated with the input end of a motor valve 8, and the output end of the motor valve 8 is connected with a gas outlet pipe 1. A small-flow elbow sensor and a large-flow elbow sensor are arranged in parallel in the air inlet pipe 9. And small-flow differential pressure transmitters 3 are arranged on the high-low pressure taking sides of the small-flow elbow sensor, large-flow differential pressure transmitters 5 are arranged on the high-low pressure taking sides of the large-flow elbow sensor, a small-flow electric control valve 2 is arranged at the tail end of the small-flow elbow sensor, and a large-flow electric control valve 6 is arranged at the tail end of the large-flow elbow sensor.
The small-flow elbow sensor and the large-flow elbow sensor are identical in shape and comprise a cylindrical flow pipe air inlet section 10 and a flow pipe air outlet section 11, inner channels of the small-flow elbow sensor and the large-flow elbow sensor are identical in pipe diameter, the flow pipe air inlet section 10 and the flow pipe air outlet section 11 are smoothly connected through a flow elbow section 12 which is in the shape of an arc of 1/4 circumference, the cross section of the inner channel of the flow elbow section 12 is circular, and the pipe diameter of the inner channel of the flow elbow section is identical to the pipe diameter of the flow pipe air inlet section 10 or the flow; the inner surface of the inner side wall 13 of the flow elbow section is cut by a plane along the axial direction of the flow elbow section 12 to form a circular arc 14, namely, a high-pressure air hole 17 and a low-pressure air hole 18 along the direction of a central line 16 bisecting the circular arc 14 are formed in the outer side wall 15 of the flow elbow section and the inner side wall 13 of the flow elbow section, the pore diameters of the high-pressure air hole 17 and the low-pressure air hole 18 are the same, and the inlet end and the outlet end of the differential pressure transmitter are communicated with the corresponding high-pressure air hole 17 and the corresponding low-pressure air hole.
The ratio of the central curvature radius R of the flow elbow to the inner diameter d of the elbow, namely the curvature ratio (R/d), is between 1 and 1.5.
The bend ratio of the bend sensor also has certain limiting requirements.
The elbow sensor with too small bending ratio (the minimum value is 0.5) can obtain larger differential pressure signals theoretically, and is favorable for improving the measurement accuracy of the flowmeter. But the large resistance coefficient zeta of the bent pipe sensor is unstable in working state at the moment, and has no practical use value; the signal (differential pressure value) generated by the bent pipe sensor with too large bending diameter ratio is small, which is not beneficial to improving the measurement precision of the instrument. The bend radius ratio of the bend sensor is usually controlled to be about 1.5.
The diameters of the high-pressure and low-pressure air holes corresponding to the flow air pipes are less than or equal to 15% of the inner diameter of the bent pipe.
The front straight pipe section of the small-flow elbow sensor is longer than 5 times of the diameter of the elbow of the small-flow elbow sensor, and the rear straight pipe section of the small-flow elbow sensor is longer than 3 times of the diameter of the elbow of the small-flow elbow sensor; the front straight pipe section of the large-flow elbow sensor is longer than 5 times of the diameter of the elbow of the large-flow elbow sensor, and the rear straight pipe section of the large-flow elbow sensor is longer than 3 times of the diameter of the elbow of the large-flow elbow sensor.
The front and rear straight pipe sections of the elbow pipe influence the stability of the flow in the elbow pipe, the flow coefficient is changed by changing the length of the straight pipe sections, and the fluid is required to be in a turbulent flow state during the measurement of the flow meter, so the measurement of the flow meter is influenced by the fact that the state (laminar flow or transition state) of the fluid may be changed when a pump or the elbow pipe exists in the past, and the requirements of the front five (D) and the rear three (D) of the straight pipe sections of the elbow pipe sensor are not absolute. It is related to the form, structure and mode of operation of the front and back interferers. Such as: the front of the elbow sensor is a regulating valve, and the opening degree of the regulating valve is continuously changed during operation. That is, the interference level of the interference source is unstable, and the straight pipe section required by the elbow sensor is a little longer. If the regulating valve is a butterfly valve, a half-open butterfly valve will cause a very significant bias flow of fluid. The coanda effect of the fluid can make it difficult to recover the original steady flow condition without eliminating this bias flow in a straight pipe of considerable length. This form of interference can have a significant impact on the proper operation of the flow sensor. In such cases, even a bent-tube flowmeter may not work properly if there is not a sufficiently long straight tube section, or if other flow-stabilizing measures are taken. Due to the shape, the structure and the working mode of the front and rear interference sources of the household double-elbow gas meter, the elbow sensor completely conforms to the stable flowing state of the fluid under the conditions of front five (D) and rear three (D) of the straight pipe section.
The small-flow electric control valve 2 and the large-flow electric control valve 6 are positioned in a sealed housing 7.
The air inlet and the air outlet of the motor valve 8 are at a right angle of 90 degrees.
The mouth of each of the gas outlet pipe 1 and the gas inlet pipe 9 of the household double-elbow gas meter is upward, and the center distance of the U-shaped gas outlet pipe and the U-shaped gas inlet pipe is 130 mm.
The working process of the invention is as follows:
when the air inflow of the air inlet pipe 9 is small, the small-flow electric control valve 2 is opened, and the large-flow electric control valve 6 is closed, so that the requirement of accurate measurement in small flow can be met.
When the air inflow of the air inlet pipe 9 is larger than the set flow, the small-flow electric control valve 2 is closed, and the large-flow electric control valve 6 is opened, so that the requirement of accurate measurement in large flow can be met.
The invention has the characteristics that: the integration, collect return bend flow sensor, control valve and differential pressure transmitter in an organic whole, removed pressure guide pipeline, various pipe fittings, improved system measurement accuracy and reliability greatly.
When the intelligent differential pressure transmitter is selected, the pressure difference can be increased or reduced through the field setting in a key or communication mode according to the change of the flow of the measured object, so that the flow range is changed, and the flow range of the system is greatly widened.
Simple structure, firmness, reliability, low price and no resistance loss.
And a throttle part is not required to be added, and the bent pipe flow sensor is only installed at the original 90-degree bent pipe of the fluid conveying pipeline.
The invention relates to a plastic molded household double-elbow gas meter, the whole parts of which are made by plastic molding technology, comprising: high precision, high complexity, high consistency, high productivity, low consumption and low price.
Therefore, the invention has the following advantages:
(1) the original material is metal material, and the material is changed into plastic.
(2) Compared with the processing of metal materials, the production efficiency is high, the same or a plurality of plastic parts can be produced by one-step molding by adopting the mold, and the production efficiency can be several times, dozens of times or hundreds of times of the processing efficiency of the metal materials.
(3) The precision of the plastic part molded by the plastic can reach below 0.01mm, usually between 0.01mm and 0.001 mm.
(4) High consistency, repeated variation in dimensions of plastic parts molded from plastic, and repeated weight variation: can be lower than 0.5%.
(5) High finish, surface roughness achievable with plastic parts molded from plastic: the Ra parameter value can be usually between 0.025-0.8 μm.
(6) The consumption is low, the utilization rate of the raw materials of the plastic parts formed by plastic is high, and 40 percent or more of blanks become scraps in the process of processing by adopting a metal material processing method.
(7) High complexity and can be injection molded into complex one-piece parts.
(8) The cost of the parts processed by adopting the metal materials is dozens of times or even hundreds of times of the cost of the plastic molding parts.
(9) The plastic has wide selection range, and can be processed and molded by selecting proper plastic according to the characteristics, properties and working conditions of the fluid.
In conclusion, it is easy to find that the plastic-molded household double-bent-tube gas meter of the invention has essential difference from the traditional bent-tube flow meter by applying new materials, new technologies, new designs and new structures on the basis of the original test principle. Meanwhile, the blank of the elbow flowmeter in the aspects of small pipe diameter and small flow measurement is filled.
Claims (9)
1. A domestic double-elbow gas meter is characterized in that: the gas table includes intake pipe (9), intake pipe (9) intercommunication sealing housing (7) one end, sealing housing (7) other end intercommunication motor valve (8) input, outlet duct (1) is connected to motor valve (8) output, be equipped with little flow elbow sensor and large-traffic return bend sensor in intake pipe (9), little flow differential pressure transmitter (3) are installed to the high-low pressure of little flow elbow sensor, large-traffic differential pressure transmitter (5) are installed to the high-low pressure of large-traffic return bend sensor, little flow automatically controlled valve (2) are installed to little flow elbow sensor output, large-traffic automatically controlled valve (6) are installed to large-traffic return bend sensor output.
2. The household double-elbow gas meter according to claim 1, characterized in that: be equipped with in intake pipe (9) the parallel small flow return bend sensor with large-traffic return bend sensor, small flow return bend sensor with large-traffic return bend sensor shape is the same, including flow pipe section of admitting air (10) and flow pipe section of giving vent to anger (11), flow pipe section of admitting air (10) with flow pipe gives vent to anger and meets through one section convex flow bend section (12) smoothness between section (11), and the internal surface of the inside lateral wall of flow bend section (13) is followed the figure that the plane of the axis direction of flow bend section (12) was cut and is obtained is circular arc (14), flow bend section outside lateral wall (15) with set up high-pressure gas pocket (17) and low pressure gas pocket (18) on the inside lateral wall of flow bend section (13).
3. The household double-elbow gas meter according to claim 2, wherein: the internal channels of the flow tube inlet section (10) and the flow tube outlet section (11) are cylindrical with consistent pipe diameters, the distance between the front straight pipe section of the small-flow elbow sensor and the diameter of the elbow of the small-flow elbow sensor is 5 times greater, and the distance between the rear straight pipe section of the small-flow elbow sensor and the diameter of the elbow of the small-flow elbow sensor is 3 times greater; the front straight pipe section of the large-flow elbow sensor is larger than the distance 5 times of the diameter of the elbow of the large-flow elbow sensor, and the rear straight pipe section of the large-flow elbow sensor is larger than the distance 3 times of the diameter of the elbow of the large-flow elbow sensor.
4. The household double-elbow gas meter according to claim 2, wherein: the flow elbow section (12) is in the shape of an 1/4 circular arc, and the ratio of the radius of curvature R of the center of the elbow to the inner diameter d of the elbow, namely the radius ratio (R/d), is between 1 and 1.5.
5. The household double-elbow gas meter according to claim 2, wherein: the high-pressure air holes (17) and the low-pressure air holes (18) have the same aperture, and the inner diameter of the high-pressure air holes and the inner diameter of the low-pressure air holes are not more than 15% of the inner diameter of the bent pipe.
6. The household double-elbow gas meter according to claim 1, characterized in that: the inlet end of the small-flow differential pressure transmitter (3) is connected with the corresponding high-pressure air hole and low-pressure air hole on the small-flow elbow sensor, and the inlet end of the large-flow differential pressure transmitter (5) is connected with the corresponding high-pressure air hole and low-pressure air hole on the large-flow elbow sensor.
7. The household double-elbow gas meter according to claim 1, characterized in that: the small-flow electric control valve (2) and the large-flow electric control valve (6) are positioned in a sealed housing (7).
8. The household double-elbow gas meter according to claim 1, characterized in that: the input end and the output end of the motor valve (8) are at a right angle of 90 degrees.
9. The household double-elbow gas meter according to claim 1, characterized in that: the mouth of pipe of outlet duct (1) with intake pipe (9) is up, gas table is its centre-to-centre spacing of U font is 130 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010873404.7A CN111982212A (en) | 2020-08-26 | 2020-08-26 | Domestic double-elbow gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010873404.7A CN111982212A (en) | 2020-08-26 | 2020-08-26 | Domestic double-elbow gas meter |
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| Publication Number | Publication Date |
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| CN111982212A true CN111982212A (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010873404.7A Pending CN111982212A (en) | 2020-08-26 | 2020-08-26 | Domestic double-elbow gas meter |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641915A (en) * | 1995-02-03 | 1997-06-24 | Lockheed Idaho Technologies Company | Device and method for measuring multi-phase fluid flow in a conduit using an elbow flow meter |
| CN101118169A (en) * | 2007-08-31 | 2008-02-06 | 程星翼 | Small diameter winding pipe flow rate sensor processed by plastics molding process |
| CN201094043Y (en) * | 2007-08-31 | 2008-07-30 | 程星翼 | Elbow-shaped sensing type gas flowmeter |
| CN102252722A (en) * | 2010-10-25 | 2011-11-23 | 中国石油化工股份有限公司 | Three-differential-pressure gas liquid two-phase fluid flow metering device |
| CN102252724A (en) * | 2011-07-04 | 2011-11-23 | 程星翼 | Small-caliber double-range elbow flow sensor and flowmeter |
| CN204115782U (en) * | 2014-07-08 | 2015-01-21 | 武照龙 | Oil recovery winding pipe flow rate metering device |
-
2020
- 2020-08-26 CN CN202010873404.7A patent/CN111982212A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641915A (en) * | 1995-02-03 | 1997-06-24 | Lockheed Idaho Technologies Company | Device and method for measuring multi-phase fluid flow in a conduit using an elbow flow meter |
| CN101118169A (en) * | 2007-08-31 | 2008-02-06 | 程星翼 | Small diameter winding pipe flow rate sensor processed by plastics molding process |
| CN201094043Y (en) * | 2007-08-31 | 2008-07-30 | 程星翼 | Elbow-shaped sensing type gas flowmeter |
| CN102252722A (en) * | 2010-10-25 | 2011-11-23 | 中国石油化工股份有限公司 | Three-differential-pressure gas liquid two-phase fluid flow metering device |
| CN102252724A (en) * | 2011-07-04 | 2011-11-23 | 程星翼 | Small-caliber double-range elbow flow sensor and flowmeter |
| CN204115782U (en) * | 2014-07-08 | 2015-01-21 | 武照龙 | Oil recovery winding pipe flow rate metering device |
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