CN101620016A - Piezoelectric fluidic heat meter - Google Patents
Piezoelectric fluidic heat meter Download PDFInfo
- Publication number
- CN101620016A CN101620016A CN200910100934A CN200910100934A CN101620016A CN 101620016 A CN101620016 A CN 101620016A CN 200910100934 A CN200910100934 A CN 200910100934A CN 200910100934 A CN200910100934 A CN 200910100934A CN 101620016 A CN101620016 A CN 101620016A
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- piezoelectric sensor
- operational amplifier
- jet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 20
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000003321 amplification Effects 0.000 abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 4
- 238000009529 body temperature measurement Methods 0.000 abstract description 3
- 239000004721 Polyphenylene oxide Substances 0.000 abstract 2
- 229920006380 polyphenylene oxide Polymers 0.000 abstract 2
- 229920006351 engineering plastic Polymers 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 32
- 238000005259 measurement Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 102220067365 rs143592561 Human genes 0.000 description 2
- 101100219315 Arabidopsis thaliana CYP83A1 gene Proteins 0.000 description 1
- 101100269674 Mus musculus Alyref2 gene Proteins 0.000 description 1
- 101100140580 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) REF2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 102220007331 rs111033633 Human genes 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
技术领域 technical field
本发明涉及热量表，尤其涉及一种基于压电式射流流量计的热量表。The invention relates to a heat meter, in particular to a heat meter based on a piezoelectric jet flowmeter.
背景技术 Background technique
热量计量是一项重要的科学计量内容，也是国家实现按实计量收费的技术手段，在贸易结算、能源计量、过程控制、环境保护等方面起到重要的作用。近年来随着能源的全球性匮乏，环境污染日趋严重，国家对用热计量的要求越来越高。当前，热量计量仪表主要有普通机械热水表和超声波流量计外加温度测量模块。机械水表和超声波流量计各有特点，机械水表以其结构简单、计量稳定、价格低廉在国内外得到广泛的应用，即装即用，无须外部供电；测量下限低，这是一般流量计难于做到的技术指标。但机械水表由于存在传动阻力、机械活动部件等因素造成水表工作条件高、精度较低、故障率较高等情况。而超声波流量计的特点与机械水表相反，几乎没有压损；无机械可动部件，可靠性高；工作条件降低。但超声波流量计的测量下限不如机械水表。Calorie measurement is an important scientific measurement content, and it is also a technical means for the country to realize charging according to actual measurement. It plays an important role in trade settlement, energy measurement, process control, and environmental protection. In recent years, with the global shortage of energy and the increasingly serious environmental pollution, the country has higher and higher requirements for heat metering. At present, heat measuring instruments mainly include ordinary mechanical hot water meters and ultrasonic flow meters plus temperature measurement modules. Mechanical water meters and ultrasonic flow meters have their own characteristics. Mechanical water meters are widely used at home and abroad for their simple structure, stable measurement, and low price. to the technical indicators. However, due to factors such as transmission resistance and mechanical moving parts, the mechanical water meter has high working conditions, low precision, and high failure rate. The characteristics of the ultrasonic flowmeter are opposite to the mechanical water meter, there is almost no pressure loss; there are no mechanical moving parts, the reliability is high, and the working conditions are reduced. However, the measurement lower limit of the ultrasonic flowmeter is not as good as that of the mechanical water meter.
射流热量表同时具有机械水表和超声波流量计的优点，又避免了机械水表和流量计的缺点。但是，现有的几种射流流量计在测量低流速的高温热水方面表现不尽如人意，而这恰恰是设计射流热量表的难点所在。The jet heat meter has the advantages of mechanical water meter and ultrasonic flow meter at the same time, and avoids the disadvantages of mechanical water meter and flow meter. However, the performance of several existing jet flowmeters is unsatisfactory in measuring low-velocity high-temperature hot water, and this is precisely the difficulty in designing jet heat meters.
射流热量表在低流速时产生的振荡信号的频率很低，幅值也很小，难以检测，而且，由于热量表是户用仪表，成本也是一个重要的考虑因数。因此，亟需设计一种适用高温热水计量的低成本射流热量表。The oscillating signal generated by the jet heat meter at low flow rate has a very low frequency and small amplitude, making it difficult to detect. Moreover, since the heat meter is a household instrument, cost is also an important consideration. Therefore, there is an urgent need to design a low-cost jet heat meter suitable for measuring high-temperature hot water.
发明内容 Contents of the invention
本发明的目的是针对现有技术的不足，提供一种压电式射流热量表，本发明准确可靠、成本低，耗极低，可用一节电池供电。The purpose of the present invention is to provide a piezoelectric jet heat meter for the deficiencies of the prior art. The present invention is accurate, reliable, low in cost, extremely low in power consumption, and can be powered by a single battery.
本发明的目的是通过以下技术方案来实现的：一种压电式射流热量表，它包括射流基表和检测电路；所述射流基表包括矩形阻流件、第一反馈通道、第二反馈通道、第一压电传感器和第二压电传感器，矩形阻流件固定在射流基表测量管内，第一压电传感器安装在第一反馈通道内，第二压电传感器安装在第二反馈通道内，第一压电传感器和第二压电传感器关于射流基表中轴位置对称；所述检测电路包括单片机、差分放大电路、比较器电路、温度检测电路、红外通信电路和LCD显示器，差分放大电路与比较器电路相连，差分放大电路、比较器电路、温度检测电路、红外通信电路和LCD显示器分别与单片机相连。所述射流基表的第一压电传感器和第二压电传感器分别与差分放大电路相连。The purpose of the present invention is achieved through the following technical solutions: a piezoelectric jet heat meter, which includes a jet base meter and a detection circuit; the jet base meter includes a rectangular choke, a first feedback channel, a second feedback channel, the first piezoelectric sensor and the second piezoelectric sensor, the rectangular choke is fixed in the measuring tube of the jet-based meter, the first piezoelectric sensor is installed in the first feedback channel, and the second piezoelectric sensor is installed in the second feedback channel Inside, the first piezoelectric sensor and the second piezoelectric sensor are symmetrical about the axial position of the jet-based meter; the detection circuit includes a single-chip microcomputer, a differential amplifier circuit, a comparator circuit, a temperature detection circuit, an infrared communication circuit and an LCD display, and the differential amplifier The circuit is connected with the comparator circuit, and the differential amplifier circuit, the comparator circuit, the temperature detection circuit, the infrared communication circuit and the LCD display are respectively connected with the single chip microcomputer. The first piezoelectric sensor and the second piezoelectric sensor of the jet-based meter are respectively connected to a differential amplifier circuit.
本发明的的有益效果是：The beneficial effects of the present invention are:
1、测量下限低，运行可靠，计量准确。1. Low measurement limit, reliable operation and accurate measurement.
2、可以检测液体流量，也可以检测蒸汽流量。2. It can detect liquid flow and steam flow.
3、采用射流结构和差分放大方法，可以获得更好的流量下限性能。3. By adopting jet structure and differential amplification method, better flow lower limit performance can be obtained.
4、电路部分采用低功耗设计，整机平均工作电流小，可用电池供电，适用于荒郊野外等没有市电的场合。4. The circuit part adopts low power consumption design, the average working current of the whole machine is small, and it can be powered by batteries, which is suitable for places without mains power such as the wilderness.
5、整个热量表即装即用，免维护，高可靠。5. The whole heat meter is installed and used immediately, maintenance-free and highly reliable.
附图说明 Description of drawings
图1是射流基表的结构示意图；Fig. 1 is a schematic structural view of a jet-based table;
图2是检测电路结构示意图；Fig. 2 is a schematic diagram of the detection circuit structure;
图3是单片机电路图。Fig. 3 is the circuit diagram of the one-chip computer.
图4是红外通信电路图；Fig. 4 is an infrared communication circuit diagram;
图5是温度测量电路图；Fig. 5 is a temperature measurement circuit diagram;
图6是差分放大电路图；Fig. 6 is a differential amplifier circuit diagram;
图中，1、矩形阻流件，2、第一反馈通道，3、第二反馈通道，4、第一压电传感器，5、第二压电传感器。In the figure, 1. Rectangular dam, 2. First feedback channel, 3. Second feedback channel, 4. First piezoelectric sensor, 5. Second piezoelectric sensor.
具体实施方式 Detailed ways
下面根据附图详细说明本发明，本发明的目的和效果将变得更加明显。The purpose and effects of the present invention will become more apparent by referring to the accompanying drawings in detail of the present invention.
如图1所示，本发明的压电式射流热量表包括射流基表和检测电路。射流基表包括矩形阻流件1、第一反馈通道2、第二反馈通道3、第一压电传感器4、第二压电传感器5。矩形阻流件1固定在射流基表测量管内，第一压电传感器4安装在第一反馈通道2内，第二压电传感器5安装在第二反馈通道3内，两个压电传感器安装位置关于射流基表中轴位置对称。经仿真和实验得到的结果可以知道，如图所示的压电传感器安装位置能使采集到的差压信号在相同流速下是幅度最大的，从而使传感器有最良好的信号采集性能。As shown in Fig. 1, the piezoelectric jet heat meter of the present invention includes a jet base meter and a detection circuit. The jet-based meter includes a
如图2所示，检测电路包括单片机、差分放大电路、比较器电路、温度检测电路、红外通信电路、LCD显示器。差分放大电路与比较器电路相连，差分放大电路、比较器电路、温度检测电路、红外通信电路、LCD显示器分别与单片机相连。射流基表的第一压电传感器4和第二压电传感器5分别与差分放大电路相连。整个检测电路靠一个电池供电。As shown in Figure 2, the detection circuit includes a single-chip microcomputer, a differential amplifier circuit, a comparator circuit, a temperature detection circuit, an infrared communication circuit, and an LCD display. The differential amplifier circuit is connected with the comparator circuit, and the differential amplifier circuit, the comparator circuit, the temperature detection circuit, the infrared communication circuit and the LCD display are respectively connected with the single chip microcomputer. The first
如图3所示，本发明的单片机可以采用美国TI公司的MSP430F4XX系列单片机(U1)，但不限于此。下面以MSP430F436为例，说明微功耗电路的实现。在CMOS器件中，功耗P与系统时钟频率f成正比，P∝V2f，其中V是电源电压。一般单片机的工作电压是不变的，所以要尽可能地降低系统时钟频率f。因此，MSP430F436只接低频晶振LFXT1＝32.768KHz，不接高频晶振XT2。MSP430F436需要高速运行时，通过MSP430F436的FLL+提供高频系统时钟。MSP430F436的BP0、BP1、BP2、BP3、S0、S1、S2、…、S25与段码式液晶LCD相连功耗只需要几个uA，MSP430F436的REF与差分放大电路相连，CVCON2脚与温度检测电路相连，TXD2、RXD2、16CLK、RST11、CVCON3、HWRXD引脚与红外接口电路相连。As shown in FIG. 3 , the MSP430F4XX series MCU (U1) of TI Company of the United States can be used as the single-chip microcomputer of the present invention, but it is not limited thereto. The following takes MSP430F436 as an example to illustrate the realization of the micro-power consumption circuit. In CMOS devices, the power consumption P is proportional to the system clock frequency f, P∝V 2 f, where V is the supply voltage. Generally, the operating voltage of the single-chip microcomputer is constant, so the system clock frequency f should be reduced as much as possible. Therefore, MSP430F436 only connects low-frequency crystal oscillator LFXT1=32.768KHz, and does not connect high-frequency crystal oscillator XT2. When the MSP430F436 needs to run at high speed, the FLL+ of the MSP430F436 provides a high-frequency system clock. BP0, BP1, BP2, BP3, S0, S1, S2, ..., S25 of MSP430F436 are connected to the segment code liquid crystal LCD, the power consumption is only a few uA, the REF of MSP430F436 is connected to the differential amplifier circuit, and the CVCON2 pin is connected to the temperature detection circuit , TXD2, RXD2, 16CLK, RST11, CVCON3, HWRXD pins are connected to the infrared interface circuit.
如图4所示，红外接口电路包括一个片红外发射接收芯片U10，一个电平转换芯片U11，两个电容C5、C6和两个电阻R12、R13，片红外发射接收芯片U10可以采用TELFUNKEN公司的TFDU4100产品，电平转换芯片U11可以采用MICROCHIP公司的-MCP2122产品。红外通信接口电路的连接关系是：单片机的二个串行通信管脚连接电平转换芯片U11的TXD2、RXD2，单片机的另外二个管脚连接U11的16CLK、RST11，单片机提供受控电源CVCON3给U10和U11，U11的RRxd、TTxd连接到红外发射接收管U10的RRxd、TTxd，其中电容C6、电容C5为电源滤波电容，电阻R12、电阻R13为限流电阻。同时红外接口电路的TXD2、RXD2、16CLK、RST11、CVCON3管脚也分别与单片机相连。该工作电路可以提供标准的IRDA1.0通信方式。As shown in Figure 4, the infrared interface circuit includes a chip infrared transmitting and receiving chip U10, a level conversion chip U11, two capacitors C5, C6 and two resistors R12, R13, the chip infrared transmitting and receiving chip U10 can be TELFUNKEN company For the TFDU4100 product, the level conversion chip U11 can use the -MCP2122 product of MICROCHIP Company. The connection relationship of the infrared communication interface circuit is: the two serial communication pins of the microcontroller are connected to TXD2 and RXD2 of the level conversion chip U11, the other two pins of the microcontroller are connected to 16CLK and RST11 of U11, and the microcontroller provides the controlled power supply CVCON3 to U10 and U11, RRxd and TTxd of U11 are connected to RRxd and TTxd of infrared transmitting and receiving tube U10, wherein capacitor C6 and capacitor C5 are power filter capacitors, resistor R12 and resistor R13 are current limiting resistors. At the same time, the TXD2, RXD2, 16CLK, RST11, and CVCON3 pins of the infrared interface circuit are also connected to the microcontroller respectively. The working circuit can provide standard IRDA1.0 communication mode.
如图5所示，温度检测电路包括2个热敏电阻PT1、PT2，2个电阻R61、R64和2个电容C60、C63。热敏电阻PT1与电容C60并联，其中一端接地，另一端与电阻R61串联，热敏电阻PT2与电容C63并联，其中一端接地，另一端与电阻R64串联，电阻R61的另一端与电阻R64的另一端一起连接到单片机的CVCON2管脚。As shown in Figure 5, the temperature detection circuit includes 2 thermistors PT1, PT2, 2 resistors R61, R64 and 2 capacitors C60, C63. Thermistor PT1 is connected in parallel with capacitor C60, one end of which is grounded, and the other end is connected in series with resistor R61. Connect one end to the CVCON2 pin of the microcontroller together.
如图6所示，差分放大电路包括3个运放U0B、U1B、U2B，11个电阻R0、R1、R2、R3、R4、R5、R8、R9、R10、R11、Rm和2个电容C0、C1。差分放大电路的连接关系为：第一压电传感器4、第二压电传感器5与差分放大电路的隔直电容C0和隔直电容C1一端相连接，隔直电容C0和隔直电容C1的另一端分别与电阻R0和电阻R1一端相连接，电阻R0和电阻R1的另一端分别与运放U2B和运放U0B的正向输入端相连接，运放U2B和运放U0B的正向输入端分别与电阻R2和电阻R3的一端相连接，电阻R2和电阻R3的另一端彼此相连接。运放U2B的反向输入端分别连接到电阻R4和电阻Rm的一端，运放U0B的反向输入端分别连接到电阻R4和电阻Rm的另一端，电阻R4的另一端分别连接运放U2B的输出端和电阻R8，电阻R5的另一端分别连接运放U0B的输出端和电阻R9，电阻R8的另一端分别连接电阻R10和运放U1B的正向输入端，电阻R9的另一端分别连接电阻R11和运放U1B的反向输入端，电阻R11的另一端连接运放U1B的输出端，电阻R10的另一端连接到参考电压VCC/2。电阻R2和电阻R3的一端连接到单片机参考电压管脚REF脚。As shown in Figure 6, the differential amplifier circuit includes 3 operational amplifiers U0B, U1B, U2B, 11 resistors R0, R1, R2, R3, R4, R5, R8, R9, R10, R11, Rm and 2 capacitors C0, C1. The connection relationship of the differential amplifier circuit is: the first
事实上，这个差分放大电路要求R0＝R1，R2＝R3，R4＝R5，R8＝R9＝R10＝R11；则输出电压VOUT＝VREF2+(vs1-vs3)×(2×R4/Rm+1)，其中vs1、vs3为两个电极的信号强度。采用差分放大电路的好处是，输入阻抗高，增益大，抗干扰能力强。In fact, this differential amplifier circuit requires R0=R1, R2=R3, R4=R5, R8=R9=R10=R11; then the output voltage VOUT=VREF2+(vs1-vs3)×(2×R4/Rm+1), Among them, vs1 and vs3 are the signal strengths of the two electrodes. The advantage of using a differential amplifier circuit is that the input impedance is high, the gain is large, and the anti-interference ability is strong.
一个实施的案例是，VCC＝3.6V，REF2＝1.8V，R4＝510KΩ，Rm＝1KΩ，R0＝R1＝10KΩ，R2＝R3＝5.1MΩ，R8＝R9＝R10＝R11＝510KΩ，C0＝C1＝10uF。差分放大电路的增益＝2×510/1+1≈1000倍。An implementation case is, VCC=3.6V, REF2=1.8V, R4=510KΩ, Rm=1KΩ, R0=R1=10KΩ, R2=R3=5.1MΩ, R8=R9=R10=R11=510KΩ, C0=C1 = 10uF. The gain of the differential amplifier circuit = 2×510/1+1≈1000 times.
本发明采用压电检测方法，检测过程是，水在水表射流基表腔体中运动，在反馈回路中产生周期变化的水流，由水流形成周期性变化的压力信号，通过压电传感器可将该周期性变化的压力信号转化为交变电压信号，这个信号依次连接到差分放大电路、比较器电路、单片机电路。The present invention adopts the piezoelectric detection method. The detection process is that the water moves in the water meter jet base cavity, and the periodically changing water flow is generated in the feedback loop, and the periodically changing pressure signal is formed by the water flow, which can be detected by the piezoelectric sensor. The periodically changing pressure signal is converted into an alternating voltage signal, and this signal is connected to a differential amplifier circuit, a comparator circuit, and a single-chip microcomputer circuit in turn.
这样，整个射流热量表的工作过程如下：水流过测量管时，产生振荡。根据射流基表的结构特征，在反馈回路中产生周期性变化的水流信号，同时在反馈回路的腔体上产生周期性变化的压力信号。经过压电传感器的转换，周期振荡的水就会产生一个交变电动势E。电动势的频率F等于振荡频率，测出电动势的频率，也就测出了水的振荡频率F，而水的平均流速V正比于水的振荡频率V＝KF，其中K为仪表系数，这样也就测出了水流速。由于压电传感器得到的交变电动势幅值跟水流成正相关，且是微弱电压信号。当水流速V降低时，信号强度E也降低，这里可以合理选择差分放大电路的增益得到较好的放大性能，使压电水表能有较宽的量程比。将压电传感器得到的微弱电压信号经过差分放大电路、比较器电路连接到单片机，经过单片机计算得到瞬时流量V。通过温度检测电路得到进水温度、出水温度T1、T2送入单片机，瞬时热量＝λV(T1-T2)，其中λ是水的热容，V为热水瞬时流量。这样，单片机也就很方便地计算累积流量、累积热量等其他参数。同时在该水表上有LCD显示器可以进行进出水温度和累积流量、累积热量的显示。由于采用低功耗设计，整机水表可以采用一节电池供电。In this way, the working process of the entire jet heat meter is as follows: when water flows through the measuring tube, oscillation is generated. According to the structural characteristics of the jet-based meter, a periodically changing water flow signal is generated in the feedback loop, and a periodically changing pressure signal is generated on the cavity of the feedback loop. After the conversion of the piezoelectric sensor, the periodically oscillating water will generate an alternating electromotive force E. The frequency F of the electromotive force is equal to the oscillation frequency. When the frequency of the electromotive force is measured, the oscillation frequency F of the water is also measured, and the average flow rate V of the water is proportional to the oscillation frequency V=KF of the water, where K is the instrument coefficient, so that The water velocity was measured. Because the amplitude of the alternating electromotive force obtained by the piezoelectric sensor is positively correlated with the water flow, it is a weak voltage signal. When the water velocity V decreases, the signal strength E also decreases. Here, the gain of the differential amplifier circuit can be reasonably selected to obtain better amplification performance, so that the piezoelectric water meter can have a wider range ratio. The weak voltage signal obtained by the piezoelectric sensor is connected to the single-chip microcomputer through the differential amplifier circuit and the comparator circuit, and the instantaneous flow V is obtained through calculation by the single-chip microcomputer. The inlet water temperature and outlet water temperature T1 and T2 are obtained by the temperature detection circuit and sent to the microcontroller, and the instantaneous heat = λV(T1-T2), where λ is the heat capacity of water, and V is the instantaneous flow rate of hot water. In this way, the microcontroller can easily calculate other parameters such as cumulative flow and cumulative heat. At the same time, there is an LCD display on the water meter to display the temperature of the water in and out, the accumulated flow and the accumulated heat. Due to the low power consumption design, the whole water meter can be powered by a single battery.
另外，蒸汽流过射流热量表时的工作过程与水流过的工作过程类似，唯一不同的是如上计算平均流速得到V＝KF其中的仪表系数K，此项可以通过调整差分放大电路的增益使热量表有良好的蒸汽流量测量性能。In addition, the working process of steam flowing through the jet heat meter is similar to the working process of water flowing through. The only difference is that the average flow velocity is calculated as above to obtain the instrument coefficient K in which V=KF. The meter has good steam flow measurement performance.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910100934A CN101620016A (en) | 2009-08-10 | 2009-08-10 | Piezoelectric fluidic heat meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910100934A CN101620016A (en) | 2009-08-10 | 2009-08-10 | Piezoelectric fluidic heat meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101620016A true CN101620016A (en) | 2010-01-06 |
Family
ID=41513364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910100934A Pending CN101620016A (en) | 2009-08-10 | 2009-08-10 | Piezoelectric fluidic heat meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101620016A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132691A (en) * | 2014-07-31 | 2014-11-05 | 国网上海市电力公司 | Operating parameter acquisition circuit of flow battery charging and discharging system |
| CN105955095A (en) * | 2016-02-02 | 2016-09-21 | 广州莱肯信息科技有限公司 | Microwave frequency sweep source |
| CN106525289A (en) * | 2016-12-10 | 2017-03-22 | 广西大学 | Self-powered heat fare register using pressure power generation as power supply |
-
2009
- 2009-08-10 CN CN200910100934A patent/CN101620016A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132691A (en) * | 2014-07-31 | 2014-11-05 | 国网上海市电力公司 | Operating parameter acquisition circuit of flow battery charging and discharging system |
| CN104132691B (en) * | 2014-07-31 | 2017-06-16 | 国网上海市电力公司 | A kind of operational factor Acquisition Circuit of flow battery charge and discharge system |
| CN105955095A (en) * | 2016-02-02 | 2016-09-21 | 广州莱肯信息科技有限公司 | Microwave frequency sweep source |
| CN106525289A (en) * | 2016-12-10 | 2017-03-22 | 广西大学 | Self-powered heat fare register using pressure power generation as power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201000374Y (en) | Wireless temperature measurement ultrasonic heat meter | |
| CN101620016A (en) | Piezoelectric fluidic heat meter | |
| CN101408441B (en) | Single-sensor thermal gas flow measurement method and device | |
| CN102401705A (en) | Measuring method and device of single temperature sensor ultrasonic wave heat | |
| CN104062038B (en) | Total temperature compensating ultrasonic heat meter | |
| CN102322981B (en) | Alternative type electromagnetic jet-flow heat meter and detecting method of same | |
| CN113532564A (en) | Gas mass flow measuring device and method | |
| CN207750645U (en) | Intelligent numerical control pipeline oil heater | |
| CN204359466U (en) | There is the ultrasonic calorimeter of fault pre-alarming function | |
| CN201251490Y (en) | Cold and hot energy integrating instrument | |
| CN202092803U (en) | Ultrasonic heat meter provided with empty tube detector | |
| CN201210061Y (en) | Intelligent magnetic vortex flow detection control system | |
| CN205228682U (en) | Ultrasonic wave calorimeter based on pressure gauge | |
| CN102798488B (en) | Electromagnetic heat meter | |
| CN202305061U (en) | Ultrasonic calorimeter with temperature compensation function | |
| CN201408094Y (en) | calorimeter based on fluidic flowmeter | |
| CN209945588U (en) | Internet of things heat meter | |
| CN100359307C (en) | Vortex calorimeter with permanent magnet structure | |
| CN202614425U (en) | Double-flowmeter ultrasonic calorimeter | |
| CN202582790U (en) | Ultrasonic heat meter | |
| CN203929285U (en) | A kind of ultrasonic calorimeter | |
| CN100545589C (en) | Be used to measure the method and the special-purpose acoustic resistance flowmeter thereof of fluid flow | |
| CN201318958Y (en) | A Thermal Gas Flowmeter Based on Single Sensor | |
| CN204422108U (en) | A kind of heat energy meter temperature measuring equipment | |
| CN204359467U (en) | A kind of heating Pitot bar calorimeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100106 |