CN203672432U - 高精度低功耗膜式燃气流量积算仪 - Google Patents
高精度低功耗膜式燃气流量积算仪 Download PDFInfo
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- CN203672432U CN203672432U CN201420012280.3U CN201420012280U CN203672432U CN 203672432 U CN203672432 U CN 203672432U CN 201420012280 U CN201420012280 U CN 201420012280U CN 203672432 U CN203672432 U CN 203672432U
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- 238000009530 blood pressure measurement Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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Abstract
本实用新型公开了一种高精度低功耗膜式燃气流量积算仪，该积算仪包括单片机、LCD显示模块、流量采集电路、温度测量电路、压力测量电路和按键。本实用新型以单片机为核心，采用PT1000和硅压阻式压力传感器作为传感元件并设计相应的温度和压力测量电路，通过对流量采集电路脉冲信号的计数得到流量值，设置了按键功能，实现了流量、温度、压力三者之间的切换显示，再根据热力学公式PV=nRT进行修正，从而求得标准流量，实现温压补偿。本实用新型结构简单，采用电池供电，具有压力检测、温度检测、液晶显示、按键等功能，成本低、精度高、功耗低，工作稳定可靠，测量精度优于1%。
Description
高精度低功耗膜式燃气流量积算仪
技术领域
[0001] 本实用新型涉及一种高精度低功耗膜式燃气流量积算仪。
[0002] 背景技术
[0003]目前，在我国的燃气行业中，绝大多数的居民用户和用气量不大的公福及工业用户的燃气计量均采用膜式燃气表。膜式燃气表是根据燃气进出流量计的燃气体积来测定其流量的，其结算是以燃气的供气状态为依据的，而与气源单位的结算是以燃气的标准状态为依据的。气体的体积受温度、压力的双重影响，所以燃气体积的购气结算状态与供气状态的不同造成了燃气体积的计量误差。在膜式燃气表的温度压力补偿的方法主要分为人工式、机械式和电子式。带有内置机械式温度修正装置的膜式燃气表，相应的产品在国外已经普遍使用，在欧美等发达国家已经将其作为燃气表的标准配置，这种产品当前在国内也开始试用，国内外的产品标准已经对其生产和检测试验提出了具体要求。随着电子技术、信息技术的发展，膜式燃气表由纯机械式计量仪表逐渐进行扩展，加装了电子装置。然而目前的电子式膜式燃气表功耗大，温度压力补偿性能差。基于燃气表的计量问题，提出了一种高精度低功耗膜式燃气流量积算仪。
实用新型内容
[0004] 本实用新型的目的是提供一种高精度低功耗膜式燃气流量积算仪，能实现温压补偿，提高燃气计量精度，降低系统功耗。
[0005] 高精度低功耗气体流量积算仪，其特征在于，以单片机为核心，采用PT1000和硅压阻式压力传感器作为传感元件并设计相应的温度和压力测量电路，通过对流量采集电路脉冲信号的计数得到流量值，设置了按键功能，实现了流量、温度、压力三者之间的切换显示，再根据热力学公式PV=nRT进行修正，从而求得标准流量，实现温压补偿。
[0006] 实现上述测量原理的系统包括单片机，温度测量电路，压力测量电路，流量采集电路，按键和IXD显示模块。温度测量电路和压力测量电路分别与单片机AD 口相连，流量采集电路和按键分别与单片机Pl 口相连，LCD显示模块与单片机采用二线式串口连接。
[0007] 本实用新型结构简单，采用电池供电，具有压力检测、温度检测、液晶显示、按键等功能，成本低、精度高、功耗低，工作稳定可靠，测量精度优于1%。
附图说明
[0008] 图1是高精度低功耗气体流量积算仪的结构示意图。
[0009] 图2是高精度低功耗气体流量积算仪一种具体电路实例。
具体实施方式
[0010] 以下结合附图进一步说明本实用新型。
[0011] 参照图1，高精度低功耗气体流量积算仪，包括单片机1、IXD显示模块2、流量采集电路3、温度测量电路4、压力测量电路5和按键6。IXD显示模块2、流量采集电路3、温度测量电路4、压力测量电路5和按键6分别与单片机I相连。
[0012]图2是高精度低功耗气体流量积算仪的一种具体电路实例，图例中，单片机采用MSP430F425 芯片。
[0013] 温度测量电路采用PtlOOO作为传感元件，PtlOOO的一端分别与ImA恒流源的正极和MSP430F425的A0.0+端相连，PtlOOO的另一端分别与MSP430F425的A0.0-端和电阻Rl的一端相连，电阻Rl的另一端分别与MSP430F425的Al.0+端和电阻R2的一端相连，电阻R2的另一端分别与MSP430F425的Al.0-端和恒流源的负极相连。
[0014] 压力测量电路采用硅压阻式压力传感器作为传感元件，压力传感器的a端与
1.5mA恒流源的正极相连，压力传感器的b端分别与运算放大器Al的第I脚相连，运算放大器Al的第2脚分别与电阻R3的一端和电阻R4的一端相连，电阻R3的另一端分别与运算放大器Al的第3脚和MSP430F425的A2.0-端相连，电阻R4的另一端分别与电阻R5的一端和运算放大器A2的第2脚相连，运算放大器A2的第I脚与压力传感器的d端相连，电阻R5的另一端分别与运算放大器A2的第3脚和MSP430F425的A2.0+端相连。
[0015] 流量采集电路由两个相同的基本电路组成，因此对其中一个基本电路I进行说明。电阻R6的一端与电压源VCC相连，电阻R6的另一端分别与簧片开关SI的一端、电容Cl的一端和运算放大器A3的第I脚相连，簧片开关S2的另一端分别与地和电容Cl的另一端相连，运算放大器A3的第2脚接地，第3脚与MSP430F425的Pl.1相连。
[0016] 工作原理如下:
[0017] 本实用新型以单片机为核心，采用PT1000和硅压阻式压力传感器作为传感元件并设计相应的温度和压力测量电路，通过对流量采集电路对脉冲信号的计数得到流量值，并设置了按键功能，实现了流量、温度、压力三者之间的切换显示，再根据热力学公式PV=nRT进行修正，可以求得标准流量，从而进行了温压补偿。
Claims (2)
1.一种高精度低功耗膜式燃气流量积算仪，其特征在于它包括单片机、LCD显示模块、流量采集电路、温度测量电路、压力测量电路和按键，温度测量电路和压力测量电路分别与单片机AD 口相连，流量采集电路和按键分别与单片机Pl 口相连，LCD显示模块与单片机采用二线式串口连接。
2.根据权利要求1所述的高精度低功耗膜式燃气流量积算仪，其特征在于，单片机采用 MSP430F425 芯片。
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| CN104949725A (zh) * | 2015-06-25 | 2015-09-30 | 苏州市英富美欣科技有限公司 | 基于温度和压强补偿的燃气流量采集装置 |
| CN105759889A (zh) * | 2015-01-05 | 2016-07-13 | 阿尔卑斯电气株式会社 | 恒流电路以及具有其的传感器装置 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759889A (zh) * | 2015-01-05 | 2016-07-13 | 阿尔卑斯电气株式会社 | 恒流电路以及具有其的传感器装置 |
| CN104949725A (zh) * | 2015-06-25 | 2015-09-30 | 苏州市英富美欣科技有限公司 | 基于温度和压强补偿的燃气流量采集装置 |
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