CN111486908B - Impeller type gas meter with temperature difference compensation - Google Patents
Impeller type gas meter with temperature difference compensation Download PDFInfo
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- CN111486908B CN111486908B CN202010190669.7A CN202010190669A CN111486908B CN 111486908 B CN111486908 B CN 111486908B CN 202010190669 A CN202010190669 A CN 202010190669A CN 111486908 B CN111486908 B CN 111486908B
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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
- G01F1/06—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 using rotating vanes with tangential admission
- G01F1/08—Adjusting, correcting or compensating means therefor
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Abstract
The invention relates to the field of gas metering, and discloses an impeller type gas meter with temperature difference compensation, which comprises an angular gas outlet, a gas meter shell, an upper sealing plate, an impeller, a measuring chamber, a lower sealing plate, a temperature control device, a sliding block, a bolt, a sealing ring and the like. Is characterized in that: the automatic temperature difference compensation is realized by adopting a speed type measuring principle, and the automatic temperature difference compensation device is simple in structure, good in assembling process, low in cost and stable in metering performance.
Description
Technical Field
The invention belongs to the field of gas metering, and particularly relates to an impeller type gas meter with temperature difference compensation.
Background
At present, the household gas meter for residents in China is basically a membrane gas meter. In the gas meter, a volume metering principle is adopted, and the volume of gas is changed under the influence of the ambient temperature, so that the metering error of the gas meter is increased, namely, the gas meter moves fast when the air temperature is high, and the gas meter moves slow when the air temperature is low, so that the metering performance of the diaphragm gas meter is unstable.
In addition, the measuring mechanism of the diaphragm gas meter has more parts, complex packaging process and higher manufacturing cost. When the diaphragm gas meter is used in a low-temperature environment, the flexibility of a diaphragm of the measuring mechanism in the meter is poor, and the diaphragm is easy to age and break, so that the diaphragm gas meter is not suitable for outdoor use.
Disclosure of Invention
The invention aims to provide an impeller type gas meter with temperature difference compensation, which solves the problem that the traditional gas meter is unstable in metering performance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an impeller type gas meter with temperature difference compensation comprises a gas meter box body with a gas inlet and a gas outlet, wherein a measuring box, an interlayer, an impeller, a temperature difference compensation mechanism and a sensing element arranged on the impeller are arranged in the gas meter box body;
the interlayer divides the measuring box into a measuring chamber and a lower flow passage chamber, and the air inlet, the lower flow passage chamber, the measuring chamber and the air outlet are communicated in sequence;
the middle part of the impeller is rotatably arranged in the measuring chamber, a plurality of blades are circumferentially and uniformly distributed on the periphery of the impeller, a plurality of inclined air outlets communicated with the air outlets are circumferentially and uniformly distributed on the inner wall of the measuring chamber, a plurality of inclined flow guide holes communicated with the lower runner chamber and the measuring chamber are circumferentially and uniformly distributed on the outer edge of the interlayer, the rotation directions of the inclined flow guide holes and the inclined air outlets are opposite, the blades are positioned on a traveling path from the inclined flow guide holes to the inclined air outlets, the inclined flow guide holes and the inclined air outlets face the blades, the device also comprises an upper sealing plate fixed at the outlet of the measuring box and a lower sealing plate fixed at the inlet of the lower runner chamber, and the air inlets are arranged on the lower sealing plate;
the temperature difference compensation mechanism comprises an error adjusting hole, a sliding block and a temperature control piece, wherein the error adjusting hole is formed in the interlayer and can lead the fuel gas of the lower flow passage chamber out to the measuring chamber, the sliding block can slide in the error adjusting hole, the temperature control piece is arranged in the lower flow passage chamber and can drive the sliding block to slide in a reciprocating mode, the error adjusting hole is symmetrically distributed along the axis of the impeller, and the temperature control piece deforms to drive the sliding block to slide when the temperature changes, so that the opening and closing area of the error adjusting hole changes.
Preferably, the error adjusting holes are symmetrically distributed along the axis of the impeller, and the sliding block is a tapered sliding block with a small upper part and a large lower part.
Preferably, one end of the sliding block, which is far away from the error adjusting hole, is clamped and fixed on the temperature control sheet.
Preferably, the temperature control sheet comprises two layers of metal sheets with different linear expansion coefficients, and a metal insert for installing the temperature control sheet is arranged in the lower runner chamber.
Preferably, the center of the interlayer is provided with a wear-resistant rotating shaft, and one end of the wear-resistant rotating shaft is rotatably connected with the center of the impeller.
Preferably, a shaft sleeve is arranged between the center of the impeller and the wear-resistant rotating shaft, and the sensing element is arranged at the upper end of the impeller.
Preferably, a convex cylindrical circular truncated cone is arranged in the middle of the upper end of the upper sealing plate, one end of the sensing element is rotatably connected to the top wall of the inner cavity of the cylindrical circular truncated cone, and the other end of the sensing element is fixedly connected to the upper end of the impeller.
Preferably, a filter screen is arranged at the air inlet.
The principle and the effect of the invention are as follows:
1. when gas enters the lower flow channel chamber of the measuring box from the gas inlet at the bottom of the lower sealing plate, and is divided along the inclined guide holes, the tangential line impacts the impeller blades to enable the impeller to rotate, the sensing element is synchronously driven at the moment, then the gas flows out along the inclined gas outlets and flows out of the gas meter shell through the gas outlets, and therefore the gas flow is measured.
2. When the environment temperature changes, the volume of the gas also changes, because the thermal expansion coefficients of the two materials of the temperature control sheet are different, when the temperature rises, the temperature control sheet is deformed under the influence of the temperature, bends downwards, and simultaneously drives the slide block fixed on the temperature control sheet to slide downwards, the opening and closing area of the error adjusting hole also changes, when the slide block slides downwards, the opening area of the error adjusting hole is increased, the airflow leaked from the error adjusting hole moves vertically, the driving force to the blade is lost, and under the condition that the flow is not changed, the driving force of the gas entering from the inclined flow guide hole in the circumferential direction of the inner wall at the lower end of the measuring chamber can be reduced, namely, the metering of the gas meter is negative error. On the contrary, when the slider upwards slides, the open area of the error adjusting hole is reduced, the gas leaked from the error adjusting hole is less, the gas driving force entering from the inclined diversion hole in the circumferential direction of the inner wall of the lower end of the measuring chamber can be increased, and the metering of the gas meter is positive error. Therefore, the method is adopted to offset the metering error caused by gas expansion, thereby realizing the automatic compensation and adjustment of the temperature difference.
3. As is known, the rotating object can be stable and durable only by keeping dynamic balance when rotating, the arrangement of the plurality of inclined guide holes and the inclined air outlets is adopted in the invention to ensure the motion balance of the rotating body, air enters the meter from the plurality of inclined guide holes which are uniformly distributed, because the flow paths of the air are equal, the impact force generated in the circumferential direction of the rotating body is also equal, and similarly, the flow paths of the air flowing out of the inclined air outlets which are uniformly distributed are also equal, so that the negative pressure generated in the circumferential direction of the rotating body when the air flows out is also equal, and the dynamic balance of the rotating body can be ensured.
4. The temperature control sheet is formed by two layers of metal sheets with different linear expansion coefficients, the linear expansion coefficients of the two materials are different, and the physical quantity change between the two materials is unequal, so that the temperature control sheet can deform, and the effect of driving the sliding block is achieved.
In conclusion, the invention solves the problems that the metering performance of the diaphragm gas meter is unstable due to the fact that the gas meter moves fast when the temperature is high and slow when the temperature is low in the prior art, eliminates the metering error caused by the influence of temperature difference, and has the advantages of low manufacturing cost, high use efficiency, difficult aging and deformation, convenience for use in various environments and strong applicability.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention at a relatively low ambient temperature;
FIG. 2 is a cross-sectional view of an embodiment of the present invention in a state of higher ambient temperature;
FIG. 3 is a cross-sectional view of a measurement box in an embodiment of the invention;
FIG. 4 is a top view of a measurement cassette in an embodiment of the invention;
FIG. 5 is a bottom view of a measurement box in an embodiment of the invention;
FIG. 6 is a cross-sectional view of an impeller in an embodiment of the invention;
FIG. 7 is a top view of an impeller of an embodiment of the present invention;
fig. 8 is a top view of the lower closure plate of the impeller in accordance with an embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the gas meter comprises a gas outlet 1, a gas meter box body 2, an upper sealing plate 3, an impeller 4, blades 4a, a shaft sleeve 4b, a sensing element 4c, a measuring box 5, an error adjusting hole 5a, a measuring chamber 5b, an oblique gas outlet 5c, an annular flow channel 5d, a lower flow channel chamber 5e, an oblique flow guide hole 5f, a metal insert 5g, a gas outlet 5h, a wear-resistant rotating shaft 5i, a lower sealing plate 6, a filter screen 6a, a temperature control piece 7, a sliding block 8, a bolt 9 and a sealing ring 10.
The embodiment is basically as shown in the attached figures 1 and 2:
an impeller type gas meter with temperature difference compensation comprises a gas meter box body 2 with a gas inlet and a gas outlet 1, wherein the gas outlet 1 is an angular gas outlet, the end face of a connecting port of the gas outlet 1 and a measuring box 5 is provided with a mounting connecting hole and a positioning boss and is fixed on the connecting port of the measuring box 5, the gas outlet 1 and the gas meter box body 2 are integrally connected through a bolt 9, and the measuring box 5, an interlayer, an impeller 4, a temperature difference compensation mechanism and a sensing element 4c fixed with the impeller 4 are arranged in the gas meter box body 2; the measuring box 5 is a rotor type measuring box, and the rotor is characterized in that when airflow flows through the blades 4a, the flowing direction of the airflow is vertical to the fixed shafts of the blades 4a, the structure is simple, and the purpose is to ensure that the impeller 4 rotates stably.
The interlayer divides the measuring box 5 into a measuring chamber 5b and a lower flow passage chamber 5e, and the air inlet, the lower flow passage chamber 5e, the measuring chamber 5b and the air outlet 1 are communicated in sequence; one end face of the air outlet 1 is connected with the measuring box 5, one end of the air outlet 5h is communicated with the annular flow channel 5d of the measuring chamber 5b, the other end of the air outlet is communicated with the air outlet 1, the annular flow channel 5d is communicated with the measuring chamber 5b, the upper end face and the lower end face of the measuring box 5 are provided with annular bosses for mounting and positioning, one side of the outer cylinder of the measuring box 5 is provided with a connecting port, the end face of the connecting port is provided with an annular sealing groove, and a sealing ring 10 is arranged in the sealing groove. Still including fixing the lower shrouding 6 at runner chamber 5e entrance down, the air inlet sets up under on shrouding 6, goes up shrouding 3 and sets up in the exit of air outlet 5h and measuring chamber 5b, goes up 3 upper ends of shrouding and is connected with gas meter box body 2, has convex cylindricality round platform in the middle of 3 upper ends of last shrouding, and sensing element for the transmission can be implanted to round platform inner chamber lower extreme, and the terminal surface still is provided with erection joint hole and positioning ring groove down, is used for fixing on measuring 5 annular bosses of box.
As shown in fig. 8, a filter screen 6a is arranged at the lower end of the lower sealing plate 6, and an installation connection hole and a positioning ring groove are arranged on the upper end surface of the filter screen 6a and are positioned and installed on the annular boss of the measuring box 5.
The middle part of the impeller 4 is rotatably arranged in a measuring chamber 5b, a plurality of blades 4a are uniformly distributed on the periphery of the impeller 4 in the circumferential direction, the blades 4a are positioned on a traveling path from an inclined guide hole 5f to an inclined gas outlet 5c, the inclined guide hole 5f and the inclined gas outlet 5c face the blades 4a, as shown in fig. 6, a temperature-resistant and wear-resistant shaft sleeve 4b is arranged in a shaft of the impeller 4, a transmission sensing element 4c is arranged at the upper end of the impeller 4, a plurality of inclined guide holes 5f communicated with a lower flow passage chamber 5e and the measuring chamber 5b are uniformly distributed on the outer edge of the interlayer in the circumferential direction, and the rotation directions of the inclined guide holes 5f and the inclined gas outlet 5c are opposite; the center of the interlayer is provided with a wear-resistant rotating shaft 5i, and one end of the wear-resistant rotating shaft 5i is rotationally connected with the center of the impeller 4.
As shown in fig. 3, the impeller 4 in the space for supporting the measuring chamber 5b is rotated; 6 inclined air outlets 5c are uniformly distributed on the inner wall of the measuring chamber 5b in the circumferential direction, as shown in fig. 4, and the number of the inclined flow guide holes 5f is 8, as shown in fig. 5; the inclined guide hole 5f is opposite to the inclined air outlet 5c in the rotating direction. The inclined diversion hole 5f of the measuring mechanism with the design structure is an air source inlet, and the inclined air outlet 5c is an outlet. If the inclined diversion hole 5f and the inclined air outlet 5c have the same rotating direction, the air flow needs to be turned and then flows out when flowing out of the inclined air outlet 5c, so that air resistance is increased when the air flows out, measurement of the air is not facilitated, and the rotating directions must be opposite.
The temperature difference compensation mechanism comprises an error adjusting hole 5a which is arranged on the interlayer and can lead the fuel gas of the lower flow passage chamber 5b out to the measuring chamber 5e, a slide block 8 which can slide in the error adjusting hole 5a and a temperature control sheet which is arranged in the lower flow passage chamber 5e and can drive the slide block 8 to slide in a reciprocating manner, the error adjusting hole 5a is symmetrically distributed along the axis of the impeller 4, the slide block 8 is a tapered slide block with a small upper part and a large lower part, the number of the error adjusting holes 5a can be processed as required, and the number of the slide block 8 is matched with the number of the error adjusting holes 5 a.
As shown in fig. 3, the lower end of the lower runner chamber 5e is provided with a metal insert 5g for installing a temperature control sheet, the temperature control sheet is a temperature control sheet 7, the temperature control sheet 7 is two layers of metal sheets with different linear expansion coefficients, and the change of the physical quantity between the two materials is unequal due to the different linear expansion coefficients of the two materials, so that the temperature control sheet 7 deforms. The temperature control plate 7 is formed by pressing materials with large linear expansion coefficient and large linear expansion coefficient (such as copper and iron, the linear expansion coefficient of copper is large, and the linear expansion coefficient of iron is small) by using common materials such as: copper, aluminum, silver, stainless steel, etc., and the material used may be selected according to the product requirements.
When the temperature changes, the temperature control sheet deforms to drive the sliding block 8 to slide, so that the opening and closing area of the error adjusting hole 5a changes. The error adjusting holes 5a are rectangular in number. The air flow goes out from the measuring box 5 near the shaft center, because the air flow direction is from bottom to top, namely, the flowing air in the vertical direction can not impact the blade 4a of the impeller 4, the air going out from the air flow direction has no kinetic energy (does not work), the opening and closing area of the error adjusting hole 5a from bottom to top is changed, and the purpose of adjusting the measuring error can be achieved. That is, the gas flows from the bottom to the top, the error regulating hole 5a is surely communicated with the lower flow path chamber 5e and the measuring chamber 5 b.
As shown in fig. 1; after the gas flow enters the gas meter with temperature difference compensation, the gas enters a lower flow channel chamber 5e of the measuring box 5 from a gas inlet 6a at the bottom of a lower sealing plate 6, is divided by a plurality of inclined flow guide holes 5f and then tangentially impacts a blade 4a to enable an impeller 4 to rotate, at the moment, a sensing element 4c is synchronously driven, and then the gas flows out of a gas meter shell along an angular gas outlet 1 connected with a plurality of inclined gas outlets 5c and an annular flow channel 5d, so that the gas flow is measured. When the temperature control sheet 7 works, the temperature control sheet is a bimetallic strip made of two materials with different thermal expansion coefficients, and the shape of the bimetallic strip is strip-shaped. When the temperature changes, the temperature control sheet 7 deforms, the slide block 8 connected with the temperature control sheet reciprocates and slides downwards in the error adjusting hole 5a, and at the moment, the opening and closing area of the error adjusting hole 5a changes. When the slider 8 slides downwards, the opening area of the error adjusting hole 5a is increased at the moment, the air flow leaked from the error adjusting hole 5a moves vertically, the blade 4a of the blade 4 loses driving force, and the driving force of the air entering from the inclined flow guide hole 5f on the circumferential direction of the inner wall of the lower end of the measuring chamber 5b is reduced under the condition that the flow is not changed, namely the metering of the gas meter is negative error.
As shown in fig. 2, conversely, when the slider 8 slides upward, the opening area of the error adjusting hole 5a decreases, and at this time, the gas leaking from the error adjusting hole 5a is small, and the gas pushing force entering from the inclined diversion hole 5f in the circumferential direction of the inner wall of the lower end of the measuring chamber 5b increases, that is, the metering of the gas meter is a positive error. Therefore, the method is adopted to offset the metering error caused by gas expansion, thereby realizing the automatic compensation and adjustment of the temperature difference.
Compared with the prior art, the diaphragm type gas meter has the advantages that the gas meter is fast to move when the temperature is high, the gas meter is slow to move when the temperature is low, the problem of unstable metering performance of the diaphragm type gas meter is caused, metering errors caused by temperature difference influence are eliminated, the manufacturing cost is low, the use efficiency is high, aging deformation is not prone to occurring, the diaphragm type gas meter is convenient to use in various environments, and the applicability is strong.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that variations and modifications can be made by those skilled in the art without departing from the structure of the present invention. These should also be construed as the scope of the present invention, and they should not be construed as affecting the effectiveness of the practice of the present invention or the applicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. An impeller type gas meter with temperature difference compensation comprises a gas meter box body with a gas inlet and a gas outlet, wherein a measuring box, an interlayer, an impeller, a temperature difference compensation mechanism and a sensing element arranged on the impeller are arranged in the gas meter box body;
the device is characterized in that the measuring box is a rotor wing type measuring box, the interlayer divides the measuring box into a measuring chamber and a lower flow passage chamber, and the air inlet, the lower flow passage chamber, the measuring chamber and the air outlet are communicated in sequence;
the middle part of the impeller is rotatably arranged in the measuring chamber, a plurality of blades are uniformly distributed on the periphery of the impeller in the circumferential direction, a plurality of inclined air outlets communicated with the air outlets are uniformly distributed on the inner wall of the measuring chamber in the circumferential direction, a plurality of inclined flow guide holes communicated with the lower runner chamber and the measuring chamber are uniformly distributed on the outer edge of the interlayer in the circumferential direction, the rotating directions of the inclined flow guide holes and the inclined air outlets are opposite, the blades are positioned on a traveling path from the inclined flow guide holes to the inclined air outlets, and the inclined flow guide holes and the inclined air outlets face the blades; the device also comprises an upper sealing plate fixed at the outlet of the measuring box and a lower sealing plate fixed at the inlet of the lower runner chamber, wherein the air inlet is arranged on the lower sealing plate;
the temperature difference compensation mechanism comprises an error adjusting hole, a sliding block and a temperature control piece, wherein the error adjusting hole is formed in the interlayer and can lead the fuel gas of the lower flow passage chamber out to the measuring chamber, the sliding block can slide in the error adjusting hole, the temperature control piece is arranged in the lower flow passage chamber and can drive the sliding block to slide in a reciprocating mode, when the temperature rises, the temperature control piece deforms, bends downwards and drives the sliding block to slide, and the opening area of the error adjusting hole is increased.
2. The impeller-type gas meter with the temperature difference compensation function according to claim 1, wherein: the error adjusting holes are symmetrically distributed along the axis of the impeller, and the sliding block is a tapered sliding block with a small upper part and a big lower part.
3. The impeller type gas meter with the temperature difference compensation function according to claim 1 or 2, wherein: and one end of the sliding block, which is far away from the error adjusting hole, is fixedly clamped on the temperature control sheet.
4. The impeller-type gas meter with the temperature difference compensation function according to claim 3, wherein: the temperature control piece comprises two layers of metal pieces with different linear expansion coefficients, and a metal insert used for installing the temperature control piece is arranged in the lower runner chamber.
5. The impeller type gas meter with the temperature difference compensation function according to any one of claims 1, 2 or 4, wherein: and a wear-resistant rotating shaft is arranged in the center of the interlayer, and one end of the wear-resistant rotating shaft is rotatably connected with the center of the impeller.
6. The impeller-type gas meter with the temperature difference compensation function according to claim 5, wherein: and a shaft sleeve is arranged between the center of the impeller and the wear-resistant rotating shaft, and the sensing element is arranged at the upper end of the impeller.
7. The impeller type gas meter with the temperature difference compensation function according to any one of claims 1, 2 or 4, wherein: the middle of the upper end of the upper sealing plate is provided with a convex cylindrical truncated cone, one end of the sensing element is rotatably connected to the top wall of the inner cavity of the cylindrical truncated cone, and the other end of the sensing element is fixedly connected to the upper end of the impeller.
8. The impeller-type gas meter with the temperature difference compensation function according to claim 7, wherein: and a filter screen is arranged at the air inlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010190669.7A CN111486908B (en) | 2020-03-18 | 2020-03-18 | Impeller type gas meter with temperature difference compensation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010190669.7A CN111486908B (en) | 2020-03-18 | 2020-03-18 | Impeller type gas meter with temperature difference compensation |
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| CN111486908A CN111486908A (en) | 2020-08-04 |
| CN111486908B true CN111486908B (en) | 2022-02-18 |
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| DE102012208292A1 (en) * | 2012-05-16 | 2013-11-21 | Robert Bosch Gmbh | A method of making an ultrasonic transducer core with an embedded piezoelectric transducer element |
| JP5932508B2 (en) * | 2012-06-15 | 2016-06-08 | 日立オートモティブシステムズ株式会社 | Thermal flow meter and manufacturing method thereof |
| CN102944268B (en) * | 2012-12-05 | 2016-02-03 | 四川海力智能科技有限公司 | A kind of intelligent gas meter with temperature compensation |
| US9435676B2 (en) * | 2014-08-08 | 2016-09-06 | Romet Limited | Counter module adaptor assembly for rotary gas meters |
| JP6257833B1 (en) * | 2017-11-02 | 2018-01-10 | 東フロコーポレーション株式会社 | Flowmeter |
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| CN107440681A (en) * | 2006-02-09 | 2017-12-08 | 德卡产品有限公司 | For distributing the device of fluid |
| CN105509834A (en) * | 2015-11-30 | 2016-04-20 | 江西三川水表股份有限公司 | Counter and water meter having same |
| CN108713130A (en) * | 2016-03-10 | 2018-10-26 | 恩德斯+豪斯流量技术股份有限公司 | For the sensor module of sensor, sensor and the measuring system formed with it |
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