WO2018036525A1 - 一种g2.5膜式燃气表 - Google Patents

一种g2.5膜式燃气表 Download PDF

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Publication number
WO2018036525A1
WO2018036525A1 PCT/CN2017/098671 CN2017098671W WO2018036525A1 WO 2018036525 A1 WO2018036525 A1 WO 2018036525A1 CN 2017098671 W CN2017098671 W CN 2017098671W WO 2018036525 A1 WO2018036525 A1 WO 2018036525A1
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Prior art keywords
channel
opening
segment
trapezoidal
metering
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PCT/CN2017/098671
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English (en)
French (fr)
Inventor
刘显峰
陈海林
刘春建
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重庆前卫克罗姆表业有限责任公司
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Publication of WO2018036525A1 publication Critical patent/WO2018036525A1/zh

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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

Definitions

  • the invention relates to the field of membrane gas meters, in particular to a G2.5 membrane gas meter with a rotary volume of 0.8L.
  • the membrane type gas meter belongs to a volumetric gas volume measuring instrument.
  • the metering system consists of two containers. Each container is divided into two measuring chambers through the membrane.
  • the pressure difference at the inlet and outlet of the gas meter promotes the movement of the membrane. Under the action of pressure difference, the membrane continuously performs alternating movements, pushing the two bonnets to continuously discharge the gas filled in the metering chamber to the gas outlet of the gas meter, and then connecting with the counter through the mechanical transmission mechanism to realize the gas passage through the membrane.
  • the gas of the table is volumetrically measured.
  • the membrane gas meters commonly used at home and abroad are G2.5 membrane gas meters, and the G2.5 membrane gas meters are capable of measuring gas in the range of 0.025 ⁇ 4m2/h; the existing G2.
  • the present invention proposes a G2.5 membrane type gas meter, and the invention solves the technology that the G2.5 membrane type gas meter can not be produced by using a movement with a rotary volume of 0.8L.
  • the problem is also solved.
  • the existing model gas meter has large volume, structural aging, poor matching of the flow channel and large pressure loss.
  • the technical scheme of the invention is: a G2.5 membrane type gas meter, comprising a mounting shell, wherein a gas inlet and a gas outlet are arranged on the mounting shell, the organic core is installed in the mounting shell, and the movement comprises a movement body a first metering shell and a second metering shell, wherein the core body is provided with a first film box and a second film box, and the first film box and the first metering shell, the second bellows box and the second metering shell respectively a first chamber and a second chamber, a first film and a second film are respectively disposed between the first film case and the first metering case, the second film box and the second metering case, and the first film is first
  • the chamber is divided into mutually independent A metering chambers and B metering chambers, and the second membrane divides the second chamber into mutually independent C metering chambers and D metering chambers, and the tops of the first metering shell and the second metering shell are respectively disposed
  • the length of the longer base of the second trapezoidal section is 21 to 24.5 mm
  • the length of the shorter base of the second trapezoidal section is 14.5 to 15.5 mm
  • the length of the partition is 32.5 to 34 mm
  • the length of the two side walls of the second square segment is 15.5 to 16.5 mm
  • the intersection of the shorter bottom side of the second trapezoidal section and the oblique side of the second trapezoidal section is compared with the first trapezoidal section on the same side.
  • the distance between the long base and the intersection of the hypotenuse in the first trapezoidal section is 14 to 15 mm.
  • first opening and the fourth opening are both rectangular structures, and the first opening and the fourth opening have a length of 35 to 36.5 mm and a width of 7 to 8 mm.
  • the fixing mechanism includes two positioning blocks and fixing holes on the supporting plate, and the two positioning blocks are respectively located at two side walls of the second square segment and sidewalls of the first square segment end Interchange.
  • the air outlet structure is substantially a three-way pipe structure, the three-way pipe structure includes an inlet end and two outlet ends, and the inlet end is in communication with the end of the first trapezoidal segment, and any one of the two outlet ends serves as The port is provided with a sealing cover at the other outlet end.
  • the fixing columns are two, and the two fixing columns are respectively located at the side walls near the top of the core body, and the supporting blocks are disposed between the two fixing columns, and the supporting blocks are fixed on the outer side walls of the air outlet structure.
  • valve grid includes a valve gate body and a fixed block
  • the valve gate body has a substantially rectangular parallelepiped structure
  • the A channel, the first common channel, and the B channel are sequentially disposed on the valve gate body along a direction in which the long sides extend.
  • a partition, a C channel, a second common channel, and a D channel and the A channel, the first common channel, the B channel, the C channel, the second common channel, and the D channel communicate with the top and bottom of the valve gate body, the A channel
  • the B channel, the C channel, and the D channel are configured to communicate with the first opening, the second opening, the third opening, and the fourth opening in one-to-one correspondence, and the first common channel and the second common channel are connected to the airflow path.
  • the fixing block is integrally formed with the valve gate body and located on the side wall of the valve gate body, and the bottom of the fixing block is flush with the bottom of the valve gate body; the middle and lower portions of the A channel and the D channel are respectively connected with the A channel extension section And the D channel extension section, and the A channel extension section and the D channel extension section are located at one side of the fixed block, and the positions of the fixing block near the bottom are respectively open to communicate with one end of the first common channel and one end of the second common channel.
  • First extended section The second extension segment.
  • the tops of the A channel, the B channel, the C channel and the D channel all have the same trapezoidal opening, and the length of one parallel side of the trapezoidal opening is 32.5 mm to 33 mm, and the length of the other parallel side of the trapezoidal opening 33.8 mm to 34.. 2 mm; the width between the two parallel sides of the trapezoidal opening is 6.2 mm to 6.4 mm, the first common passage and the first The top of the two common passages has a rectangular opening, the rectangular opening has a length of 33.8 mm to 34.2 mm, and the rectangular opening has a width of 12.5 mm to 12.7 mm.
  • the length of the bonnet opening is 31.5 mm to 33.5 mm, and the width of the bonnet opening is 12.5 mm to 13.5 mm.
  • the movement is installed in the installation, and the outlet end of the air outlet structure on the movement body is aligned with the gas outlet.
  • the valve grid and the valve cover cooperate to sequentially inflate and discharge the four gauges.
  • the gas causes the film located between the metering chambers to be subjected to the pressure difference generated during the movement of the gas in the movement body, and pushes the film to reciprocate linearly.
  • the movement of the film drives the vertical axis movement connected by the flap and the film, and the vertical shaft is connected with the transmission mechanism.
  • the vertical shaft drives the transmission mechanism to make a rotary motion, and the transmission mechanism drives the transmission mechanism to connect with the valve cover.
  • the transmission mechanism drives the valve cover to reciprocate on the guide rail to continuously inflate and exhaust the four metering chambers, so that the gas is continuously continued. Measurement.
  • the G2.5 membrane gas meter has a rotary volume of 0.8L.
  • the gas volume of the gas volume of 0.8L to 4m2/ is realized by a rotary volume of 0.8L membrane gas meter.
  • the accurate detection function in the h range meets the performance index specified by the national standard of the membrane gas meter; the improvement of the flow channel structure makes the structure of the movement body more reasonable and the flow channel matching is better, and the G2.5 film in the invention
  • the volume of the gas meter is one-half the volume of the existing G2.5 membrane gas meter, which not only reduces the cost of gas meter packaging, transportation and storage, but also greatly reduces the cost of parts for producing gas meters. Table assembly and inspection costs are reduced.
  • the gas outlet structure in the invention is designed as a three-way pipe structure, so that the gas outlet structure has two At the outlet end, one outlet end can be arbitrarily selected as an air outlet, and then the other air outlet end is mounted with a sealing cover, so that different outlet ends can be selected as the air outlet according to the position of the air outlet of the mounting housing, so that the present invention
  • the applicability of the movement body is better; and the air outlet structure is arranged on the movement body, so that the strength of the air outlet structure is better, and the gas leakage in the gas meter is prevented from being deformed at the air outlet, thereby ensuring the G2.5 membrane type.
  • the metering accuracy of the gas meter is designed as a three-way pipe structure, so that the gas outlet structure has two At the outlet end, one outlet end can be arbitrarily selected as an air outlet, and then the other air outlet end is mounted with a sealing cover, so that different outlet ends can be selected as the air outlet according to the position of the air outlet of the mounting housing, so that the present invention
  • the positioning block is accurately positioned before the valve grid is fixed on the movement body, thereby avoiding the inaccuracy or gap between the opening on the valve gate and the first opening to the fourth opening, and the positioning block will be
  • the valve grid is initially fixed to prevent offset or lift when the valve grid is fixed, thus ensuring that the valve grid can be accurately and tightly fixed on the movement body to ensure the accuracy of the metering of the non-gas meter.
  • the A channel extension section, the D channel extension section, the first extension section and the second extension section are respectively set, so that the A channel, the D channel, the first common channel and the second common channel are respectively arranged.
  • the length of the middle and lower portions becomes longer, so that the gas enters from the top of the passage, flows out from the bottom of the passage, and the length of the bottom of the passage is lengthened, so that the cross-sectional area at the bottom of the passage is increased, so that the pressure loss of the gas can be reduced, so that the present invention
  • the pressure loss value is 150-160 Pa, which satisfies the requirement of the maximum pressure loss permissible value of 200 Pa specified in the membrane gas meter GB/T6968-2011, which ensures the product quality of the invention, and the stability of the gas metering of the present invention. Repeatability.
  • Figure 1 is a front view of the present invention.
  • Figure 2 is a front elevational view of the movement of the present invention.
  • Figure 3 is a plan view of Figure 2.
  • Figure 4 is a schematic view showing the structure of the movement removing mechanism of the movement of the present invention.
  • Figure 5 is a schematic cross-sectional view showing the movement of the movement removing mechanism of the present invention.
  • Figure 6 is a plan view of the valve grid of the present invention.
  • Figure 7 is a bottom plan view of the valve grid of the present invention.
  • Figure 8 is a schematic cross-sectional view showing the valve grid of the present invention.
  • the present invention includes a mounting housing 1 on which a gas inlet 2 and a gas outlet 3 are disposed, an organic core is mounted in the mounting housing 1, and the movement includes a movement Body 6, first metering shell 4 and second metering shell 5, the core body 6 is provided with a first bellows casing 7 and a second bellows casing 8, a first bellows casing 7 and a first metering shell 4, a second bellows box 8 and the second metering shell 5 respectively constitute a first chamber and a second chamber, and the first bellows 7 and the first metering shell 4, the second bellows 8 and the second metering shell 5 are respectively provided with a first The membrane 34 and the second membrane 35, and the first membrane 34 separates the first chamber into mutually independent A metering chambers 9 and B metering chambers 10, and the second membrane 35 separates the second chamber into mutually independent C metering chambers.
  • the first metering shell 4 and the top of the second metering shell 5 are respectively provided with a first opening 13 communicating with the A metering chamber 9 and a fourth opening 14 communicating with the D metering chamber 12; the movement body 6
  • the top of the movement body structure 17 is provided on the side wall of the movement body 6 perpendicular to the film, and the vertical shaft fixing tube 15 respectively communicating with the first bellows case 7 and the second bellows case 8 is disposed, and the vertical shaft is fixed.
  • the vertical shaft fixing tube 15 is used for installing the vertical shaft 16; and the vertical shaft fixing tube 15 is located at one end of the flow path structure 17, and the other end of the flow path structure 17 is provided with an air outlet structure 18, and the air outlet structure 18 is discharged in the movement to complete the metering of the gas in the flow path structure. 17 above and close to the air outlet A fixing post 19 is provided, and the fixing post 19 is used for fixing the transmission mechanism; the flow channel structure 17 includes a distribution air passage 17a and an air outlet passage 17b, and the cross section of the air distribution passage 17a and the outlet air passage 17b are both sides of the rectangular shape.
  • the air outlet 17b includes a first square segment and a first trapezoidal segment, and the end of the first trapezoidal segment communicates with the air outlet structure 18, the first square
  • the side wall at the end of the segment is fixed near the vertical shaft fixing pipe 15, and the two side walls of the first square segment are fitted to the side wall parallel to the film at the top of the movement body 6
  • the air distribution channel 17a includes the second square segment And a second trapezoidal section, the side wall at the end of the second square section is connected to the outer side wall of the vertical shaft fixing tube 15, and the second square section is embedded in the side wall at the end of the first square section;
  • Structure 17 enables the performance requirements specified in the membrane gas meter GB/T6968-2011 to be satisfied when the rotary volume of the membrane gas meter is 0.8L, so that the rotary volume of the membrane gas meter is 0.8L.
  • Gas metering function in the range of 0.025 ⁇ 4m2/h; in meeting G2.5
  • the G2.5 membrane gas meter has the smallest volume, which is about one-half of the volume of the existing G2.5 membrane gas meter, which makes the gas meter parts, packaging, transportation and storage.
  • the runner structure 17 has strong matching and wider applicability;
  • the side wall at the end of the second trapezoidal section is provided with a support plate 20 connected to the side wall at the end of the first trapezoidal section, the support plate The top surface is flush with the top of the second trapezoidal segment end and the first trapezoidal segment end, and the lower portion of the support plate 20 is a suspended structure, so that the airflow passage meets the standard of the G2.5 membrane gas meter;
  • the support plate 20 For fixing the valve grid 21 and the transmission mechanism;
  • the distribution air passage 17a is provided with a partition 22 which divides the distribution air passage 17a into a second opening 23 communicating with the B metering chamber 10 and a portion communicating with the C metering chamber 11 Three openings 24, and the second opening 23 and the third opening 24 are bilaterally symmetrical with respect to the partition 22; the top of the movement body 6 passes through a fixing mechanism
  • the valve grid 21 is installed, and after the valve grid 21 is fixed, the valve gate 21 and the first opening 13 to the fourth opening
  • the vertical shaft 16 connected to the first film 34 and the second film 35 through the folding plate is respectively installed in the two vertical shaft fixing tubes 15, and the other end of the vertical shaft 16 is connected with the transmission mechanism, and the error adjustment mechanism is further provided in the transmission mechanism.
  • the transmission mechanism is connected to the two valve covers 25; the transmission mechanism includes a rocker arm 26 connected to the vertical shaft 16, and the other end of the rocker arm 26 is connected with a connecting rod 27; the other end of the connecting rod 27 is connected with the error adjusting mechanism 28, and the error
  • the adjusting mechanism 28 is mounted on the bracket 29, one end of the bracket 29 is fixed on the fixing post 19, and the other end of the bracket 29 is fixed on the valve cover 25; thus, the error adjusting mechanism 28 can distribute the valve cover on the valve grill.
  • the first film 34 and the second film 35 are subjected to a pressure difference generated by the gas, so that the first film 34 and the second film 35 reciprocate, and the first film 34 and the second film 35 drive the vertical shaft 16 to move, and the vertical shaft 16 drives the error.
  • the adjusting mechanism 28 and the bracket 29 rotate, and the one-way counter counts, and the bracket 29 drives the valve cover 25 to perform gas distribution to realize accurate volumetric measurement of the gas flow rate by the membrane type gas meter.
  • the length of the longer base of the second trapezoidal section is 21 to 24.5 mm
  • the length of the shorter base of the second trapezoidal section is 14.5 to 15.5 mm
  • the length of the partition is 32.5 to 34 mm
  • the second square The length of the two side walls of the segment is 15.5 to 16.5 mm
  • the distance between the intersections of the oblique sides in the trapezoidal section is 14 to 15 mm
  • the first opening The 13 and the fourth opening 14 have a rectangular structure, and the first opening 13 and the fourth opening 14 have a length of 35 to 36.5 mm and a width of 7 to 8 mm.
  • the membrane type gas meter having a rotary volume of 0.8 L can achieve a flow rate of 4 m 2 /h or more.
  • the gas is metered such that the present invention satisfies performance criteria such that the flow channel structure 17 of the present invention is optimized and the volume of the present invention is minimized such that parts, packaging, transportation, storage, installation, and overhaul of the product
  • the convenience cost is reduced, and the air flow path starts from the side wall of the second square section and the oblique connection of the second trapezoidal section, and the width of the air flow path is increased, so that the pressure loss during the gas metering process is also reduced.
  • the stability, accuracy and repeatability of the product quality and measurement of the invention are guaranteed.
  • the fixing mechanism includes two positioning blocks 30 and fixing holes 31 on the supporting plate 20.
  • the fixing holes 31 are blind holes, and the two positioning blocks 30 are respectively located on the two side walls of the second square segment and the first side. The intersection of the side walls at the end of the square segment; in the present invention, the positioning of the valve grid 21 on the movement of the movement body 6 is performed by the positioning block 30, and the opening on the valve gate 21 and the first opening 13 to the fourth opening are avoided. 14 is inaccurate or has a gap, and the positioning block 30 preliminarily fixes the valve grid 21 to prevent the valve grid 21 from being offset or lifted when it is fixed, thus ensuring that the valve grid 21 can be accurately and tightly fixed in the machine. On the core 6, the accuracy of the gas meter measurement is ensured.
  • the air outlet structure 18 is generally a three-way pipe structure.
  • the three-way pipe structure includes an inlet end and two outlet ends, and the inlet end is in communication with the end of the first trapezoidal section, and either one of the two outlet ends is used.
  • the outlet port is provided with a sealing cover 36 at the other outlet end; so that the outlet structure 18 has two outlet ends, and one of the outlet ends can be arbitrarily selected as the outlet.
  • the mouth is then installed on the other outlet end of the sealing cover 36, so that different outlet ends can be selected as the air outlet according to the position of the air outlet of the mounting housing 1, so that the applicability of the movement body 6 in the present invention is better;
  • the air outlet structure 18 is disposed on the movement body 6, so that the strength of the air outlet structure 18 is better, and the gas leakage in the gas meter is prevented from being deformed at the air outlet, thereby ensuring the measurement accuracy of the G2.5 membrane gas meter.
  • the valve gate 21 includes a valve gate body 211 and a fixed block 212.
  • the valve gate body 211 has a substantially rectangular parallelepiped structure.
  • the valve gate body 211 is sequentially provided with an A channel 37 along the direction in which the long sides extend.
  • the 42 and D channels 43 communicate with the top and bottom of the valve gate body 211, and the A channel 37, the B channel 39, the C channel 41, and the D channel 43 are used for the first opening 13, the second opening 23, the third opening 24, and the fourth.
  • the openings 14 are in one-to-one correspondence.
  • the first common passage 38 communicates with the second common passage 40 and the outlet air passage 17b.
  • the structure and size of the bottom surface of the valve gate body 211 are matched with the flow passage structure 17; the fixed block 212 passes through the valve gate body 211. Integrally formed and located on the side wall of the valve gate body 211, the bottom of the fixing block 212 is flush with the bottom of the valve gate body 211, and the shape and support plate of the fixing block 212 The shape of 20 is matched; the middle and lower portions of the A channel 37 and the D channel 43 are respectively connected with the A channel extension segment 44 and the D channel extension segment 45, and the A channel extension segment 44 and the D channel extension segment 45 are located on one side of the fixed block 212.
  • the position of the fixing block 212 near the bottom is respectively opened with a first extension section 46 and a second extension section 47 which communicate with one end of the first common passage 38 and one end of the second common passage 40.
  • the A channel extension section 44, the D channel extension section 45, the first extension section 46 and the second extension section 47 are respectively disposed, so that the A channel 37, the D channel 43, and the first common channel are respectively provided.
  • the pressure loss is such that the pressure loss value in the present invention is 150 to 160 Pa, which satisfies the requirement of the maximum pressure loss permissible value of 200 in the gas meter GB/T6968-2011, which ensures the product quality of the present invention, and the present invention.
  • the stability and repeatability of the gas metering the cross-sectional area at the bottom of the channel is increased, and on the other hand, the contact area between the valve gate body and the flow channel structure can be increased, so that the valve gate body is bonded to the flow channel by glue.
  • the structural stability and sealing are better, preventing gas leakage inside the gas meter, and inaccurate measurement occurs.
  • the tops of the A channel 37, the B channel 39, the C channel 41 and the D channel 43 all have the same trapezoidal opening, the length of one parallel side of the trapezoidal opening is 32.5 mm to 33 mm, and the length of the other parallel side of the trapezoidal opening is 33.8 mm.
  • the width between the two parallel sides of the trapezoidal opening is 6.2mm ⁇ 6.4mm
  • the top of the first common channel 38 and the second common channel 40 are rectangular openings
  • the length of the rectangular opening is 33.8mm ⁇ 34.2 Mm
  • the width of the rectangular opening is 12.5mm ⁇ 12.7mm
  • the length of the bonnet opening is 31.5mm ⁇ 33.5mm
  • the width of the bonnet opening is 12.5mm ⁇ 13.5mm
  • the length of the valve grid and the bonnet is increased, so as to ensure that the gas flow entering the movement body meets the intake requirement of the present invention, so that the gas of the present invention
  • the measurement accuracy is more accurate, ensuring good performance of the gas meter.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

一种G2.5膜式燃气表，安装壳体（1）中安装有机芯，机芯包括机芯体（6）、机芯体（6）的顶部设置流道结构（17），配气流道（17a）和出气流道（17b）的横截面均呈由长方形的任意一边和等腰梯形较长的底边重合组成的六边形结构，配气流道（17a）中设置隔板（22），机芯的顶部通安装有阀栅（21），阀栅（21）上有两个阀盖（25）；两个立轴固定管（15）中分别安装有立轴（16），立轴（16）的另一端与传动机构连接，传动机构上设置误差调节机构（28），传动机构与两个阀盖（25）连接。通过对机芯中的流道和阀栅（21）进行了改进和设计，还设置有误差调节机构（28），使得G2.5膜式燃气表中的回转体积为0.8L就能够满足膜式燃气表国家标准GB/T6968，流道结构更加优化，计量精度高，且燃气表的体积减小，使得零件成本、包装、运输及仓储成本都大幅度降低。

Description

一种G2.5膜式燃气表 技术领域
本发明涉及膜式燃气表领域，尤其是涉及一种回转体积为0.8L的G2.5膜式燃气表。
背景技术
膜式燃气表属于一种容积式气体体积计量仪表，由两个容器组成的计量系统，每个容器通过皮膜又分为两个计量室，由于燃气表进出口处的压力差推动皮膜运动，在压力差的作用下，皮膜不断的做交替运动，推动两个阀盖把充满计量室的燃气不断的排到燃气表的出气口处，再通过机械传动机构与计数器连接，实现对通过膜式燃气表的燃气进行体积计量。现在国内外常用的膜式燃气表都是G2.5膜式燃气表，G2.5膜式燃气表是指能够对流量在0.025～4㎡/h范围内的燃气进行计量；现有的G2.5膜式燃气表回转体积都为1.2L才能满足膜式燃气表标准规定的性能要求，这样导致现有的燃气表的体积大，结构老化及流道的匹配性差，现有的G2.5膜式燃气表中的压力损失为210-220Pa，因此，现有的G2.5膜式燃气表的压力损失值超过了膜式燃气表GB/T6968-2011中规定的压力损失最大允许值200Pa，压损不满足膜式燃气表标准规定的最大损失最大允许值导致膜式燃气表的计量精度、计量稳定性和计量重复性差，导致现有的膜式燃气表的产品品质差。
发明内容
针对现有技术中的上述问题，本发明提出了一种G2.5膜式燃气表，本发明解决了现在还无法使用回转体积为0.8L的机芯生产制造G2.5膜式燃气表的技术问题；还解决了现有的模式燃气表体积大，结构老化、流道的匹配性差及压损大等技术问题。
本发明的技术方案为：一种G2.5膜式燃气表，包括安装壳体，安装壳体上设置燃气进口和燃气出口，所述安装壳体中安装有机芯，机芯包括机芯体、第一计量壳及第二计量壳，所述机芯体上设置有第一皮膜盒和第二皮膜盒，第一皮膜盒与第一计量壳、第二皮膜盒和第二计量壳分别组成第一腔室和第二腔室，第一皮膜盒与第一计量壳、第二皮膜盒与第二计量壳之间均分别设有第一皮膜和第二皮膜，且第一皮膜将第一腔室分隔成相互独立的A计量室和B计量室，第二皮膜将第二腔室分隔成相互独立的C计量室和D计量室，第一计量壳和第二计量壳的顶部分别设置与A计量室连通的第一开口和与D计量室连通的第四开口；机芯体的顶部设置流道结构，机芯体上与皮膜垂直的侧壁上设置有分别与第一皮膜盒和第二皮膜盒连通的立轴固定管，且立轴固定管位于流道结构的一端，流道结构的另一端设有出气结构，在流道结构上方且靠近出气口处设置有固定柱；所述流道结构包括配气流道和出气流道，所述配气流道和出气流道的横截面均呈由长方形的任意一边和等腰梯形较长的底边重合组成的六边形结构，所述出气流道包括第一方形段和第一梯形段，所述第一梯形段的端头与出气结构连通，第一方形段端头处的侧壁固定在靠近立轴固定管处，所述第 一方形段的两条侧壁与机芯体顶部与皮膜平行的侧壁贴合；所述配气流道包括第二方形段和第二梯形段，所述第二方形段端头处的侧壁与立轴固定管的外侧壁连接，并且第二方形段嵌入在第一方形段端头处的侧壁中；第二梯形段端头处的侧壁上设有与第一梯形段端头处的侧壁连接的支撑板；所述配气流道中设置隔板，所述隔板将配气流道分为与B计量室连通的第二开口和与C计量室连通的第三开口，且第二开口和第三开口关于隔板左右对称；所述机芯体的顶部通过固定机构安装有阀栅，所述阀栅上通过固定在阀栅两端的导轨固定有两个阀盖；所述两个立轴固定管中分别安装有通过折板与第一皮膜和第二皮膜连接的立轴，立轴的另一端与传动机构连接，传动机构中还设有误差传动机构，且传动机构与两个阀盖连接。
进一步地，所述第二梯形段较长的底边的长度为21～24.5mm，第二梯形段较短的底边长度为14.5～15.5mm，所述隔板的长度为32.5～34mm；所述第二方形段两条侧壁的长度为15.5～16.5mm；所述第二梯形段中较短的底边与第二梯形段中斜边的交点与位于同一侧的第一梯形段中较长底边与第一梯形段中斜边的交点之间的距离为14～15mm。
进一步地，所述第一开口和第四开口均为长方形结构，所述第一开口和第四开口的长度为35～36.5mm，宽度为7～8mm。
进一步地，所述固定机构包括两个定位块和位于支撑板上的固定孔，所述两个定位块分别位于第二方形段的两条侧壁与第一方形段端头处侧壁的交汇处。
进一步地，所述出气结构大致呈三通管结构，三通管结构包括一个进口端和两个出口端，进口端与第一梯形段的端头连通，两个出口端中的任意一个作为出气口，另一个出口端设置有密封盖。
进一步地，所述固定柱为2个，两个固定柱分别位于靠近机芯体顶部的侧壁处，两个固定柱之间设有支撑块，且支撑块固定在出气结构的外侧壁上。
进一步地，所述阀栅包括阀栅本体和固定块，所述阀栅本体大致呈长方体结构，所述阀栅本体上沿着长边延伸的方向依次设置A通道、第一公共通道、B通道、分隔区、C通道、第二公共通道及D通道，且A通道、第一公共通道、B通道、C通道、第二公共通道及D通道连通阀栅本体的顶部和底部，所述A通道、B通道、C通道、D通道用于与第一开口、第二开口、第三开口及第四开口一一对应连通，所述第一公共通道和第二公共通道与出气流道连通，所述固定块通过与阀栅本体一体成型且位于阀栅本体的侧壁上，固定块的底部与阀栅本体的底部平齐；所述A通道和D通道的中下部分别连接有A通道加长段和D通道加长段，且A通道加长段和D通道加长段位于固定块的一侧，所述固定块靠近底部的位置分别开有与第一公共通道的一端和第二公共通道的一端连通的第一加长段和第二加长段。
进一步地，所述A通道、B通道、C通道和D通道的顶部均呈相同的梯形开口，所述梯形开口的一条平行边的长度为32.5mm～33mm，梯形开口的另一条平行边的长度为33.8mm～34..2mm；所述梯形开口的两条平行边之间的宽度为6.2mm～6.4mm，所述第一公共通道和第 二公共通道的顶部呈长方形开口，所述长方形开口的长度为33.8mm～34.2mm，所述长方形开口的宽度为12.5mm～12.7mm。
进一步地，所述阀盖开口的长度为31.5mm～33.5mm，阀盖开口的宽度为12.5mm～13.5mm。
本发明中机芯安装在安装可以中，机芯体上的出气结构的出口端与燃气出口对准，当燃气进口通过燃气时，阀栅和阀盖相互配合对四个计量进行依次充气和排气，使得位于计量室之间的皮膜受到燃气在机芯体内运动过程中产生的压力差，推动皮膜作直线往复运动，皮膜运动带动通过折板与皮膜连接的立轴运动，立轴与传动机构连接，立轴就带动传动机构做旋转运动，传动机构再带动传动机构与阀盖连接，传动机构在带动阀盖在导轨上作往复运动对四个计量室持续进行充气和排气，使得对燃气进行持续的计量。
与现有技术相比，本发明的有益效果是：
①本发明中G2.5膜式燃气表的回转体积为0.8L，通过对流道结构和阀栅的设计和改进，使得回转体积为0.8L膜式燃气表实现了燃气流量在0.025～4㎡/h范围内的准确检测功能，满足膜式燃气表国家标准规定的性能指标；对流道结构的改进，使得机芯体的结构更加合理，流道匹配性更好，本发明中的G2.5膜式燃气表的体积为现有的G2.5膜式燃气表体积的二分之一，不但降低了燃气表包装、运输和仓储的成本，还使得生产燃气表的零件成本大幅度的降低，燃气表装配和检测成本降低。
②本发明中的出气结构设计为三通管结构，使得出气结构具有两 个出口端，可以任意选一个各出口端作为出气口，然后将另一个出气端安装密封盖，这样使得可以根据安装壳体的出气口的位置选择不同的出气端作为出气口，使得本发明中的机芯体的适用性更好；且出气结构设置在机芯体上，使得出气结构的强度更好，避免出气口处发生形变造成燃气表内漏气的情况，保证了G2.5膜式燃气表的计量精度。
③本发明中通过定位块对阀栅固定在机芯体上之前进行精准定位，避免阀栅上的开口与第一开口至第四开口之间对应不准确或者出现缝隙的情况，并且定位块将阀栅进行初步固定，防止阀栅固定时发生偏移或者翘起，这样保证阀栅能够准确和紧密的固定在机芯体上，保证不燃气表的计量的准确性。
④本发明中通过对阀栅结构进行改进，分别设置A通道加长段、D通道加长段、第一加长段和第二加长段，使得A通道、D通道、第一公共通道和第二公共通道的中下部的长度变长，使得燃气从通道的顶部进入，从通道的底部流出，通道底部的长度加长，使得通道底部的横截面积增大，这样可以降低燃气的压力损失，使得本发明中的压力损失值为150～160Pa，满足膜式燃气表GB/T6968-2011中规定的最大压力损失许可值为200Pa的要求，保证了本发明的产品质量，以及本发明的燃气计量的稳定性和重复性。
附图说明
图1为本发明的主视图。
图2为本发明机芯的主视图。
图3为图2的俯视图。
图4为本发明中机芯去掉传动机构的结构示意图。
图5为本发明中机芯去掉传动机构的剖面示意图。
图6为本发明中阀栅的俯视图。
图7为本发明中阀栅的仰视图。
图8为本发明中阀栅的剖面结构示意图。
具体实施方式
下面结合附图及实施例对本发明中的技术方案进一步说明。
参照附图1、2、3、4、5，本发明包括安装壳体1，安装壳体1上设置燃气进口2和燃气出口3，安装壳体1中安装有机芯，机芯包括机芯体6、第一计量壳4及第二计量壳5，机芯体6上设置有第一皮膜盒7和第二皮膜盒8，第一皮膜盒7与第一计量壳4、第二皮膜盒8和第二计量壳5分别组成第一腔室和第二腔室，第一皮膜盒7与第一计量壳4、第二皮膜盒8与第二计量壳5之间均分别设有第一皮膜34和第二皮膜35，且第一皮膜34将第一腔室分隔成相互独立的A计量室9和B计量室10，第二皮膜35将第二腔室分隔成相互独立的C计量室11和D计量室12，第一计量壳4和第二计量壳5的顶部分别设置与A计量室9连通的第一开口13和与D计量室12连通的第四开口14；机芯体6的顶部设置流道结构17，机芯体6上与皮膜垂直的侧壁上设置有分别与第一皮膜盒7和第二皮膜盒8连通的立轴固定管15，立轴固定管15用于安装立轴16；且立轴固定管15位于流道结构17的一端，流道结构17的另一端设有出气结构18，出气结构18排出在机芯中完成计量的燃气，在流道结构17上方且靠近出气口 处设置有固定柱19，固定柱19用于固定传动机构；流道结构17包括配气流道17a和出气流道17b，配气流道17a和出气流道17b的横截面均呈由长方形的任意一边和等腰梯形较长的底边重合组成的六边形结构；出气流道17b包括第一方形段和第一梯形段，第一梯形段的端头与出气结构18连通，第一方形段端头处的侧壁固定在靠近立轴固定管15处，第一方形段的两条侧壁与机芯体6顶部与皮膜平行的侧壁贴合；配气流道17a包括第二方形段和第二梯形段，第二方形段端头处的侧壁与立轴固定管15的外侧壁连接，并且第二方形段嵌入在第一方形段端头处的侧壁中；这样设置流道结构17使得当膜式燃气表的回转体积为0.8L时，就能够满足膜式燃气表GB/T6968-2011中规定的性能要求，使得膜式燃气表的回转体积为0.8L仍然能够实现流量在0.025～4㎡/h范围内的燃气计量功能；在满足G2.5膜式燃气表性能标准的情况下，使得G2.5膜式燃气表体积最小，是现有的G2.5膜式燃气表体积的二分之一左右，使得燃气表的零件、包装、运输和仓储成本都达到最低，流道结构17匹配性强，适用性更广；第二梯形段端头处的侧壁上设有与第一梯形段端头处的侧壁连接的支撑板20，支撑板的顶面与第二梯形段端头和第一梯形段端头的顶部平齐,而支撑板20的下方为悬空结构,使得出气流道满足G2.5膜式燃气表的标准；支撑板20用来固定阀栅21和传动机构；配气流道17a中设置隔板22，隔板22将配气流道17a分为与B计量室10连通的第二开口23和与C计量室11连通的第三开口24，且第二开口23和第三开口24关于隔板22左右对称；机芯体6的顶部通过固定机构 安装有阀栅21，固定好阀栅21之后，再通过胶水对阀栅21和第一开口13至第四开口14进行密封，避免出现漏气的问题；阀栅21上通过固定在阀栅21两端的导轨33固定有两个阀盖25，这样保证两个阀盖25只作直线往复运动，导轨33可以保证阀盖25在运动过程中位置不会发生偏移，使得给计量室配气准确性好；两个立轴固定管15中分别安装有通过折板与第一皮膜34和第二皮膜35连接的立轴16，立轴16的另一端与传动机构连接，传动机构中还设有误差调节机构；传动机构与两个阀盖25连接；传动机构包括与立轴16连接的摇臂26，摇臂26的另一端连接有连杆27；连杆27的另一端与误差调节机构28连接，且误差调节机构28安装在支架29上，支架29的一端固定在固定柱19上，支架29的另一端固定在阀盖25上；这样使得误差调节机构28可以对阀盖在阀栅上进行配气的精度进行调节；由于第一皮膜34和第二皮膜35受到燃气产生的压力差的作用，使得第一皮膜34和第二皮膜35作往复运动，第一皮膜34和第二皮膜35带动立轴16运动，立轴16带动误差调节机构28和支架29转动，同时单向计数器进行计数，支架29带动阀盖25运动进行配气，实现膜式燃气表对燃气流量进行准确体积计量。
参照附图5，第二梯形段较长的底边的长度为21～24.5mm，第二梯形段较短的底边长度为14.5～15.5mm，隔板的长度为32.5～34mm；第二方形段两条侧壁的长度为15.5～16.5mm；第二梯形段中较短的底边与第二梯形段中斜边的交点与位于同一侧的第一梯形段中较长底边与第一梯形段中斜边的交点之间的距离为14～15mm；第一开口 13和第四开口14均为长方形结构，第一开口13和第四开口14的长度为35～36.5mm，宽度为7～8mm。这样设置流道结构17，能够满足本发明中第一至第四开口14满足进气和排气量的要求，使得能够实现回转体积为0.8L的膜式燃气表实现流量在4㎡/h以上燃气进行计量，使得本发明满足性能标准的情况下，使得本发明中的流道结构17达到最优，并且是本发明的体积达到最小，使得产品的零件、包装、运输、仓储、安装及检修等方便的成本都减少，并且出气流道从第二方形段的侧壁与第二梯形段斜边连接处开始，出气流道的宽度增加，使得也减小了燃气计量过程中的压力损失，保证本发明的产品质量及计量的稳定性、准确性和重复性。
参照附图4，固定机构包括两个定位块30和位于支撑板20上的固定孔31，固定孔31为盲孔,两个定位块30分别位于第二方形段的两条侧壁与第一方形段端头处侧壁的交汇处；本发明中通过定位块30对阀栅21固定在机芯体6上之前进行定位，避免阀栅21上的开口与第一开口13至第四开口14之间对应不准确或者出现缝隙的情况，并且定位块30将阀栅21进行初步固定，防止阀栅21固定时发生偏移或者翘起，这样保证阀栅21能够准确和紧密的固定在机芯体6上，保证燃气表计量的准确性。
参照附图4，出气结构18大致呈三通管结构，三通管结构包括一个进口端和两个出口端，进口端与第一梯形段的端头连通，两个出口端中的任意一个作为出气口，另一个出口端设置有密封盖36；使得出气结构18具有两个出口端，可以任意选一个各出口端作为出气 口，然后将另一个出气端安装密封盖36，这样使得可以根据安装壳体1的出气口的位置选择不同的出气端作为出气口，使得本发明中的机芯体6的适用性更好；且出气结构18设置在机芯体6上，使得出气结构18的强度更好，避免出气口处发生形变造成燃气表内漏气的情况，保证了G2.5膜式燃气表的计量精度。
固定柱19为2个，两个固定柱19分别位于靠近机芯体6顶部的侧壁处，两个固定柱19之间设有支撑块32，且支撑块32固定在出气结构18的外侧壁上；保证固定柱19的强度，防止固定柱19长时间使用受外力和温度的影响发生形变，保证固定柱的稳定性更好，避免整个传动系统造成误差影响阀栅21和阀盖25进行配气工作，保证本发明良好的计量精度。
参照附图6、7、8，阀栅21包括阀栅本体211和固定块212，阀栅本体211大致呈长方体结构，阀栅本体211上沿着长边延伸的方向依次设置A通道37、第一公共通道38、B通道39、分隔区40、C通道41、第二公共通道42及D通道43，且A通道37、第一公共通道38、B通道39、C通道41、第二公共通道42及D通道43连通阀栅本体211的顶部和底部，A通道37、B通道39、C通道41、D通道43用于与第一开口13、第二开口23、第三开口24及第四开口14一一对应连通，第一公共通道38与第二公共通道40与出气流道17b连通，阀栅本体211底面的结构和尺寸与流道结构17匹配；固定块212通过与阀栅本体211一体成型且位于阀栅本体211的侧壁上，固定块212的底部与阀栅本体211的底部平齐，固定块212的形状与支撑板 20的形状匹配；A通道37和D通道43的中下部分别连接有A通道加长段44和D通道加长段45，且A通道加长段44和D通道加长段45位于固定块212的一侧，固定块212靠近底部的位置分别开有与第一公共通道38的一端和第二公共通道40的一端连通的第一加长段46和第二加长段47。本发明中通过对阀栅结构进行改进，分别设置A通道加长段44、D通道加长段45、第一加长段46和第二加长段47，使得A通道37、D通道43、第一公共通道38和第二公共通道40的中下部的长度变长，使得燃气从通道的顶部进入，从通道的底部流出，通道底部的长度加长，使得通道底部的横截面积增大，这样可以降低燃气的压力损失，使得本发明中的压力损失值为150～160Pa，满足膜式燃气表GB/T6968-2011中规定的最大压力损失许可值为200的要求，保证了本发明的产品质量，以及本发明的燃气计量的稳定性和重复性，通道底部的横截面积增大，另一方面使得可以增加阀栅本体与流道结构之间的接触面积，使得将阀栅本体通过胶水粘接在流道结构上的稳定性和密封性更好，防止燃气表的内部出现漏气，计量不准确的情况发生。
A通道37、B通道39、C通道41和D通道43的顶部均呈相同的梯形开口，梯形开口的一条平行边的长度为32.5mm～33mm，梯形开口的另一条平行边的长度为33.8mm～34..2mm；梯形开口的两条平行边之间的宽度为6.2mm～6.4mm，第一公共通道38和第二公共通道40的顶部呈长方形开口，长方形开口的长度为33.8mm～34.2mm，长方形开口的宽度为12.5mm～12.7mm，阀盖开口的长度为31.5mm～ 33.5mm，阀盖开口的宽度为12.5mm～13.5mm；增加了阀栅和阀盖的长度，这样设置保证进入到机芯体中的燃气流量满足本发明的进气要求，使得本发明的燃气计量精度更加准确，保证燃气表良好的产品性能。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种G2.5膜式燃气表，包括安装壳体，安装壳体上设置燃气进口和燃气出口，所述安装壳体中安装有机芯，机芯包括机芯体、第一计量壳及第二计量壳，所述机芯体上设置有第一皮膜盒和第二皮膜盒，第一皮膜盒与第一计量壳、第二皮膜盒和第二计量壳分别组成第一腔室和第二腔室，第一皮膜盒与第一计量壳、第二皮膜盒与第二计量壳之间均分别设有第一皮膜和第二皮膜，且第一皮膜将第一腔室分隔成相互独立的A计量室和B计量室，第二皮膜将第二腔室分隔成相互独立的C计量室和D计量室，第一计量壳和第二计量壳的顶部分别设置与A计量室连通的第一开口和与D计量室连通的第四开口；其特征在于：机芯体的顶部设置流道结构，机芯体上与皮膜垂直的侧壁上设置有分别与第一皮膜盒和第二皮膜盒连通的立轴固定管，且立轴固定管位于流道结构的一端，流道结构的另一端设有出气结构，在流道结构上方且靠近出气口处设置有固定柱；所述流道结构包括配气流道和出气流道，所述配气流道和出气流道的横截面均呈由长方形的任意一边和等腰梯形较长的底边重合组成的六边形结构，所述出气流道包括第一方形段和第一梯形段，所述第一梯形段的端头与出气结构连通，第一方形段端头处的侧壁固定在靠近立轴固定管处，所述第一方形段的两条侧壁与机芯体顶部与皮膜平行的侧壁贴合；所述配气流道包括第二方形段和第二梯形段，所述第二方形段端头处的侧壁与立轴固定管的外侧壁连接，并且第二方形段嵌入在第一方形段端头处的侧壁中； 第二梯形段端头处的侧壁上设有与第一梯形段端头处的侧壁连接的支撑板,所述支撑板的顶面与第二梯形段和第一梯形段的顶面平齐,且支撑板的正下方为悬空结构；所述配气流道中设置隔板，所述隔板将配气流道分为与B计量室连通的第二开口和与C计量室连通的第三开口，且第二开口和第三开口关于隔板左右对称；所述机芯体的顶部通过固定机构安装有阀栅，所述阀栅上通过固定在阀栅两端的导轨固定有两个阀盖；所述两个立轴固定管中分别安装有通过折板与第一皮膜和第二皮膜连接的立轴，立轴的另一端与传动机构连接，传动机构中还设有误差传动机构，且传动机构与两个阀盖连接。
  2. 据权利要求1所述的G2.5膜式燃气表，其特征在于：所述第二梯形段较长的底边的长度为21～24.5mm，第二梯形段较短的底边长度为14.5～15.5mm，所述隔板的长度为32.5～34mm；所述第二方形段两条侧壁的长度为15.5～16.5mm；所述第二梯形段中较短的底边与第二梯形段中斜边的交点与位于同一侧的第一梯形段中较长底边与第一梯形段中斜边的交点之间的距离为14～15mm。
  3. 据权利要求1所述的G2.5膜式燃气表，其特征在于：所述第一开口和第四开口均为长方形结构，所述第一开口和第四开口的长度为35～36.5mm，宽度为7～8mm。
  4. 根据权利要求1所述的G2.5膜式燃气表，其特征在于：所述固定机构包括两个定位块和位于支撑板上的固定孔，所述两个定位块分别位于第二方形段的两条侧壁与第一方形段端头处侧壁的交汇处。
  5. 根据权利要求1所述的G2.5膜式燃气表，其特征在于：所述出 气结构大致呈三通管结构，三通管结构包括一个进口端和两个出口端，进口端与第一梯形段的端头连通，两个出口端中的任意一个作为出气口，另一个出口端设置有密封盖。
  6. 根据权利要求1所述的G2.5膜式燃气表，其特征在于：所述固定柱为2个，两个固定柱分别位于靠近机芯体顶部的侧壁处，两个固定柱之间设有支撑块，且支撑块固定在出气结构的外侧壁上。
  7. 根据权利要求1所述的G2.5膜式燃气表，其特征在于：所述阀栅包括阀栅本体和固定块，所述阀栅本体大致呈长方体结构，所述阀栅本体上沿着长边延伸的方向依次设置A通道、第一公共通道、B通道、分隔区、C通道、第二公共通道及D通道，且A通道、第一公共通道、B通道、C通道、第二公共通道及D通道连通阀栅本体的顶部和底部，所述A通道、B通道、C通道、D通道用于与第一开口、第二开口、第三开口及第四开口一一对应连通，所述第一公共通道和第二公共通道与出气流道连通，所述固定块通过与阀栅本体一体成型且位于阀栅本体的侧壁上，固定块的底部与阀栅本体的底部平齐；所述A通道和D通道的中下部分别连接有A通道加长段和D通道加长段，且A通道加长段和D通道加长段位于固定块所在的一侧，所述固定块靠近底部的位置分别开有与第一公共通道的一端和第二公共通道的一端连通的第一加长段和第二加长段。
  8. 根据权利要求7所述的G2.5膜式燃气表，其特征在于：所述A通道、B通道、C通道和D通道的顶部均呈相同的梯形开口，所述梯形开口的一条平行边的长度为32.5mm～33mm，梯形开口的另一条平行边 的长度为33.8mm～34.2mm；所述梯形开口的两条平行边之间的宽度为6.2mm～6.4mm，所述第一公共通道和第二公共通道的顶部呈长方形开口，所述长方形开口的长度为33.8mm～34.2mm，所述长方形开口的宽度为12.5mm～12.7mm。
  9. 根据权利要求7所述的G2.5膜式燃气表，其特征在于：所述阀盖开口的长度为31.5mm～33.5mm，阀盖开口的宽度为12.5mm～13.5mm。
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