CN203629626U - Gas mass flow measuring device - Google Patents

Gas mass flow measuring device Download PDF

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Publication number
CN203629626U
CN203629626U CN201320865309.8U CN201320865309U CN203629626U CN 203629626 U CN203629626 U CN 203629626U CN 201320865309 U CN201320865309 U CN 201320865309U CN 203629626 U CN203629626 U CN 203629626U
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Prior art keywords
mass flow
gas mass
digital signal
cpu chip
model
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CN201320865309.8U
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Chinese (zh)
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毕雪林
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Beijing SDL Technology Co Ltd
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Beijing SDL Technology Co Ltd
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Abstract

The utility model discloses a gas mass flow measuring device which comprises a gas mass flow sensor and a correcting circuit, wherein the gas mass flow sensor and the correcting circuit are connected, the gas mass flow sensor is used for detecting gas mass flow and outputting a first digital signal representing the gas mass flow rate through a communication interface, and the correcting circuit is used for correcting the first digital signal to obtain a second digital signal. By the adoption of the gas mass flow measuring device, the purpose of improving the accuracy of a flow measurement signal is realized.

Description

A kind of gas mass flow measuring device
Technical field
The utility model relates to circuit engineering field, relates in particular to a kind of gas mass flow measuring device. 
Background technology
Analyze in industry at chromatography of gases, the stability of chromatographic apparatus output signal, is to be determined by the flow of gas, so need to detect gas mass flow.Existing gas mass flow detection circuit as shown in Figure 1, mainly by gas mass flow quantity sensor (AWM4330 sensor or AWM4215 sensor), operational amplifier, data acquisition chip (AD chip 1286) and 51 single-chip microcomputers (STC89C516) form, its principle of work is: first, utilize gas mass flow quantity sensor to detect gas mass flow, and the simulating signal of output-response uninterrupted, then, after utilizing operational amplifier to amplify described simulating signal, send into data acquisition chip and carry out AD conversion, so that the analog electrical signal after amplifying is converted to digital signal, finally described digital signal is sent into 51 single-chip microcomputers. 
But, in existing gas mass flow detection circuit, there is following defect:
First, the gas mass flow quantity sensor in existing testing circuit can only detect pure gas kind, just needs the more model of emat sensor in the time need to detecting different gas, and this can bring very large inconvenience in actual use; In addition, sensor output signal is analog voltage, and signal is also larger to the interference of described gas mass flow detection circuit while transmission. 
Secondly, existing testing circuit need to be by regulating slide resistor to regulate the reference voltage of described operational amplifier and the reference voltage of described data acquisition chip, also need to change by adjusting slide resistor zero-point voltage and the reference voltage of described data acquisition chip, to complete the correction of the zeroing to described data acquisition chip and the flow signal to described operational amplifier output.But, while changing magnitude of voltage by manual slide rheostat, not only cannot determine change amount but also stable detection circuit rapidly, this can cause the fluctuation that testing circuit inside is very large, thereby the accuracy of the flow signal that impact detects, signal accuracy also decreases. 
Utility model content
In view of this, the fundamental purpose of the utility model embodiment is to provide a kind of gas mass flow measuring device, to realize the object of the accuracy that improves flow detecting signal. 
For achieving the above object, the utility model embodiment provides a kind of gas mass flow measuring device, comprising: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
Preferably, in said apparatus, the model of described gas mass flow quantity sensor is FS5001. 
Preferably, in said apparatus, described communication interface is RS-232. 
Preferably, in said apparatus, described correcting circuit is central processor CPU chip, and the model of described cpu chip is STM32F103. 
Preferably, in said apparatus, described correcting circuit is central processor CPU chip, and the model of described cpu chip is STC5A60S2. 
Preferably, said apparatus also comprises: liquid crystal display, be connected with described cpu chip, and for receiving the second digital signal of described cpu chip transmission, and show described the second digital signal. 
Preferably, said apparatus also comprises: 485 buses, are connected with described cpu chip, for described the second digital signal is uploaded to host computer. 
The gas mass flow measuring device that the utility model embodiment provides, utilize the gas mass flow quantity sensor of exportable digital signal to carry out flow detection, overcome analog electrical signal interference to circuit generation in signals transmission of sensor output in prior art, thereby improved the stability of circuit; In addition, utilize correcting circuit to proofread and correct digital signal, do not need to carry out voltage-regulation by manual slide rheostat as prior art and realize the correction to sensor output signal, further improved the stability of circuit, and then guaranteed the accuracy of output signal.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing. 
Fig. 1 is the structural representation of gas mass flow measuring device in prior art;
One of structural representation of the gas mass flow measuring device that Fig. 2 provides for the utility model embodiment;
Two of the structural representation of the gas mass flow measuring device that Fig. 3 provides for the utility model embodiment;
Three of the structural representation of the gas mass flow measuring device that Fig. 4 provides for the utility model embodiment;
Four of the structural representation of the gas mass flow measuring device that Fig. 5 provides for the utility model embodiment;
Five of the structural representation of the gas mass flow measuring device that Fig. 6 provides for the utility model embodiment. 
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection. 
Embodiment mono-
Referring to Fig. 2, the structural representation of the gas mass flow measuring device providing for the utility model embodiment mono-, this device comprises: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
Embodiment bis-
Referring to Fig. 3, the structural representation of the gas mass flow measuring device providing for the utility model embodiment bis-, this device comprises: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
Particularly, the model of described gas mass flow quantity sensor is FS5001, and described communication interface is RS-232; Described correcting circuit is central processor CPU chip, and the model of described cpu chip is STM32F103. 
On the basis of above-described embodiment one, the gas mass flow measuring device of the present embodiment two also comprises:
Liquid crystal display, is connected with described cpu chip (model is STM32F103), for receiving the second digital signal of described cpu chip transmission, and shows described the second digital signal. 
Embodiment tri-
Referring to Fig. 4, the structural representation of the gas mass flow measuring device providing for the utility model embodiment tri-, this device comprises: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
Particularly, the model of described gas mass flow quantity sensor is FS5001, and described communication interface is RS-232; Described correcting circuit is central processor CPU chip, and the model of described cpu chip is STC5A60S2. 
On the basis of above-described embodiment one, the gas mass flow measuring device of the present embodiment three also comprises:
Liquid crystal display, is connected with described cpu chip (model is STC5A60S2), for receiving the second digital signal of described cpu chip transmission, and shows described the second digital signal. 
Embodiment tetra-
Referring to Fig. 5, the structural representation of the gas mass flow measuring device providing for the utility model embodiment tetra-, this device comprises: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
Particularly, the model of described gas mass flow quantity sensor is FS5001, and described communication interface is RS-232; Described correcting circuit is central processor CPU chip, and the model of described cpu chip is STM32F103. 
On the basis of above-described embodiment one, the gas mass flow measuring device of the present embodiment four also comprises:
485 buses, are connected with described cpu chip (model is STM32F103), for described the second digital signal is uploaded to host computer. 
Embodiment five
Referring to Fig. 6, the structural representation of the gas mass flow measuring device providing for the utility model embodiment five, this device comprises: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
Particularly, the model of described gas mass flow quantity sensor is FS5001, and described communication interface is RS-232; Described correcting circuit is central processor CPU chip, and the model of described cpu chip is STC5A60S2. 
On the basis of above-described embodiment one, the gas mass flow measuring device of the present embodiment five also comprises:
485 buses, are connected with described cpu chip (model is STC5A60S2), for described the second digital signal is uploaded to host computer. 
In above-described embodiment two to embodiment five, use the new gas mass flow sensor of FS5001 serial ports output, for gas mass flow quantity sensor FS5001, have the following advantages:
1, transducer sensitivity is high, has minimum initial-flow;
2, sensor chip adopts thermal mass flow sensors amount, without temperature pressure compensation, has guaranteed the high-precision measuring of sensor;
3, on one single chip, realized multisensor integrated, its range ratio is improved;
4, can pass through communication interface active upload data (RS232);
5, zero point stability degree is high;
6, gamut high stability, pinpoint accuracy;
7, low-power consumption, low pressure loss;
8, fast response time. 
Above-mentioned advantage based on gas mass flow sensor chip FS5001 is known, because FS5001 adopts thermal mass flow sensors amount, without temperature, pressure compensation, has guaranteed the high-precision metering of sensor, thereby has greatly improved the precision of sensor output signal; In addition, FS5001 is by communication interface active upload data (RS232), with respect to the simulating signal of gas mass flow quantity sensor output in prior art, FS5001 has overcome simulating signal can produce to circuit the defect of larger interference in signal transduction process, thereby has greatly improved the stability of testing circuit device. 
It should be noted that, in the time utilizing gas mass flow quantity sensor to detect gas mass flow, owing to being subject to the impact of the factors such as environment temperature, can there is certain error in the digital signal that gas mass flow quantity sensor is exported, so, in above-described embodiment two and embodiment tetra-, need to utilize cpu chip to proofread and correct the digital signal of gas mass flow quantity sensor output.The cpu chip that the utility model embodiment adopts is STM32F103, is 32 single-chip microcomputers, and compared with 8 single-chip microcomputers of the prior art, STM32F103 has higher arithmetic speed; In addition, utilizing STM32F103 to carry out timing to described the first digital signal, can use the calibration curve coefficient of its inner Flash storage for described the first digital signal is proofreaied and correct, and can directly carry out in actual applications the modification of calibration curve coefficient, to obtain actual required gas mass flow signal (i.e. the second digital signal).Visible, the utility model embodiment uses more powerful cpu chip STM32F103 to realize Data correction, has greatly improved accuracy and the data operation speed of data.Same, cpu chip STC5A60S2 has advantage and the function of STM32F103 equally, so described correcting circuit can also be cpu chip STC5A60S2, referring to above-described embodiment three and embodiment five. 
It should be noted that, the data correcting function of realizing for described cpu chip, can also pass through totalizer, subtracter, the hardware circuit such as multiplier and divider is realized, for example, when the first digital signal of described gas mass flow quantity sensor output is X, when signal after correction is described the second digital signal Y, if the pass between described the first digital signal X and described the second digital signal Y is Y=aX+b, wherein, a and b are calibration curve coefficient, now just can adopt multiplier and totalizer composition correcting circuit, and export described the second digital signal Y. 
The gas mass flow measuring device that the utility model embodiment provides, utilize the gas mass flow quantity sensor of exportable digital signal to carry out flow detection, overcome analog electrical signal interference to circuit generation in signals transmission of sensor output in prior art, thereby improved the stability of circuit; In addition, utilize correcting circuit to proofread and correct digital signal, do not need to carry out voltage-regulation by manual slide rheostat as prior art and realize the correction to sensor output signal, further improved the stability of circuit, and then guaranteed the accuracy of output signal.
It should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element. 
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty. 

Claims (7)

1. a gas mass flow measuring device, is characterized in that, comprising: interconnective gas mass flow quantity sensor and correcting circuit;
Described gas mass flow quantity sensor, for detection of gas mass flow, and exports the first digital signal that reflects described gas mass flow size by communication interface;
Described correcting circuit, for proofreading and correct described the first digital signal, to obtain the second digital signal. 
2. device according to claim 1, is characterized in that,
The model of described gas mass flow quantity sensor is FS5001. 
3. device according to claim 2, is characterized in that,
Described communication interface is RS-232. 
4. device according to claim 1, is characterized in that, described correcting circuit is central processor CPU chip, and the model of described cpu chip is STM32F103. 
5. device according to claim 1, is characterized in that, described correcting circuit is central processor CPU chip, and the model of described cpu chip is STC5A60S2. 
6. according to the device described in claim 4 or 5, it is characterized in that, described device also comprises:
Liquid crystal display, is connected with described cpu chip, for receiving the second digital signal of described cpu chip transmission, and shows described the second digital signal. 
7. according to the device described in claim 4 or 5, it is characterized in that, described device also comprises:
485 buses, are connected with described cpu chip, for described the second digital signal is uploaded to host computer. 
CN201320865309.8U 2013-12-25 2013-12-25 Gas mass flow measuring device Active CN203629626U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108475077A (en) * 2015-12-29 2018-08-31 日立金属株式会社 The insensitive mass flow control system of gas and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108475077A (en) * 2015-12-29 2018-08-31 日立金属株式会社 The insensitive mass flow control system of gas and method
CN108475077B (en) * 2015-12-29 2021-03-05 日立金属株式会社 Gas insensitive mass flow control system and method

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