Control system of gas flowmeter

Abstract

The utility model relates to a control system of a gas flow meter, which is characterized by comprising a pulse detection module electrically connected with the gas flow meter and used for detecting pulse signals generated when the gas flow meter works; and the controller is electrically connected with the pulse detection module and is configured to generate a metering result of the gas flowmeter according to a detection result of the pulse detection module. The control system has the advantages that the control system is simple in control logic and easy to implement, human interference is not needed, gas metering accuracy is improved, and abnormal conditions of the gas flowmeter can be found easily according to detection results of the pulse detection module.

Description

Technical Field

[0001] The utility model relates to the technical field of gas flow measurement, in particular to a control system of a gas flow meter. Background Art

[0002] A gas flow meter is an instrument used to measure gas flow. It is widely used in the measurement of gases such as coal gas and natural gas. The wet gas flow meter is a leak-free positive displacement flow meter due to its special sealing form. Its error characteristics are significantly different from other positive displacement flow meters. The measurement accuracy can reach 0.2-0.5 levels. When measuring the total volume of gas, its accuracy is relatively high, especially at small flow rates, its error is small.

[0003] Although the wet gas flow meter can ensure high measurement accuracy through its unique structure, the reading method for the wet gas flow meter in the prior art usually adopts manual reading of the start and end positions of the flow meter rotation and measuring the time required for the number of rotations by using a stopwatch. Since there are many factors affecting the manual reading method, the measurement result of the wet gas flow meter will have large errors.

[0004] In order to solve the above technical problems, a Chinese utility model patent with patent number ZL 202121128673.7 (authorization announcement number CN215491896U) discloses a wet gas flow meter with high measurement accuracy. The wet gas flow meter consists of a shell sealing support assembly, a metering drum rotating mechanism and a metering indication indicating mechanism. The wet gas flow meter is driven by the measured gas to rotate the metering drum installed inside the shell, and then the metering value is transmitted to the metering indication indicating mechanism outside the shell through magnetic coupling. Although the above-mentioned metering result can be displayed through the metering indication indicating mechanism, which solves the problem of large errors in manual reading, the overall structure of the above-mentioned metering indication indicating mechanism is complex and costly, and the metering is only achieved through a mechanized structure. If one of the mechanical components becomes abnormal after long-term use, it will affect the metering result, so that the staff has no way of knowing the accuracy of the metering result. For this reason, further improvements to the prior art are needed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a control system for a gas flow meter which can improve the accuracy of gas measurement and easily detect abnormal measurement conditions, in view of the above-mentioned prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a control system of a gas flow meter, characterized in that it includes:

[0007] A pulse detection module, electrically connected to the gas flow meter, for detecting a pulse signal generated when the gas flow meter is working;

[0008] The controller is electrically connected to the pulse detection module and is configured to generate a metering result of the gas flow meter according to a detection result of the pulse detection module.

[0009] In order to facilitate the detection of pulse signals, the control system also includes an operational amplifier for amplifying pulse signals, the input end of the operational amplifier is electrically connected to the output end of the pulse detection module, and the output end of the operational amplifier is electrically connected to the control port of the controller. In this way, the pulse signal is amplified by the operational amplifier, which can facilitate the detection of the pulse signal on the one hand; on the other hand, it can also avoid the reading error caused by the pulse signal being too small, thereby improving the detection accuracy of the pulse signal.

[0010] In order to achieve control over the gas flow, the controller is electrically connected with buttons for setting the timing time and starting the timing.

[0011] In order to facilitate users to read the measurement results intuitively, the controller is also electrically connected to a display unit, and the display unit is used to display the gas flow meter measurement time and the gas flow meter measurement results.

[0012] The above-mentioned display unit can be in the form of a digital tube or a display screen. In order to reduce costs, the display unit includes a first digital tube for displaying the metering time of the gas flow meter and a second digital tube for displaying the metering result of the gas flow meter. The first digital tube and the second digital tube are both electrically connected to the output end of the controller through a driving module.

[0013] In order to provide a reminder after the metering is completed, the control system further includes an alarm unit for alarming, and the alarm unit is electrically connected to the controller.

[0014] Preferably, the alarm unit is at least one of a buzzer and a display light.

[0015] In order to improve the accuracy of pulse detection, the output end of the pulse detection module is also connected to a filtering unit for filtering the pulse signal.

[0016] In order to realize intelligent control, the controller is electrically connected to a human-machine interaction unit, and the human-machine interaction unit has at least one of the above-mentioned buttons, display units, alarm units and filter units.

[0017] Preferably, the gas flow meter is a wet gas flow meter.

[0018] Compared with the prior art, the utility model has the advantages that the pulse detection module detects the pulse signal generated when the gas flow meter is working, and the controller processes the detection result of the pulse detection module, so that the gas measurement result can be quickly obtained. The control logic of the control system is simple, easy to implement, and does not require human intervention, which improves the accuracy of gas measurement, and it is also easy to find abnormal conditions of the gas flow meter according to the detection results of the pulse detection module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a principle block diagram of a gas flow meter control system in Embodiment 1 of the present utility model;

[0020] Figure 2 This is a circuit diagram of a controller in Embodiment 1 of the present utility model;

[0021] Figure 3 This is a circuit diagram of the pulse detection module in the first embodiment of the utility model;

[0022] Figure 4 This is a circuit diagram of a driving module in Embodiment 1 of the present utility model;

[0023] Figure 5 This is a circuit diagram of the display unit in the first embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] Embodiment 1:

[0026] like Figures 1 to 5 As shown, the control system of the gas flow meter in this embodiment includes a pulse detection module 1 and a controller 3. The pulse detection module 1 is electrically connected to the gas flow meter 2 and is used to detect the pulse signal generated when the gas flow meter 2 is working; the controller 3 is electrically connected to the pulse detection module 1 and is configured to generate the metering result of the gas flow meter 2 according to the detection result of the pulse detection module 1. In this embodiment, the controller 3 is an MCU (microprocessor).

[0027] In this embodiment, the gas flow meter 2 is taken as a wet gas flow meter as an example. The wet gas flow meter can be used to measure the gas flow during the combustion process of the stove. To ensure the stability of the gas flow, the stove needs to burn for a period of time before testing. Therefore, the countdown time needs to be set. When the stove starts to burn, press the confirmation button to start the countdown.

[0028] The control system also includes an operational amplifier 4 for amplifying the pulse signal, the input end of the operational amplifier 4 is electrically connected to the output end of the pulse detection module 1, and the output end of the operational amplifier 4 is electrically connected to the control port of the controller 3. In addition, in order to avoid the pulse signal output by the gas flow meter 2 having burrs and other clutter phenomena, resulting in inaccurate detection of the number of pulses, in this embodiment, the output end of the pulse detection module 1 is also connected to a filter unit for filtering the pulse signal. The filter unit is a prior art and will not be elaborated here.

[0029] In addition, the controller 3 is electrically connected to a button 5, a display unit 6 and an alarm unit 7, wherein the button 5 is used to set the timing time and start the timing, and the display unit 6 is used to display the metering time of the gas flow meter 2 and the metering result of the gas flow meter 2. In this embodiment, the display unit 6 includes a first digital tube 61 for displaying the metering time of the gas flow meter 2 and a second digital tube 62 for displaying the metering result of the gas flow meter 2. The first digital tube 61 and the second digital tube 62 are both electrically connected to the output end of the controller 3 through a driving module 63; the alarm unit 7 is used to alarm when the metering result of the gas flow meter 2 reaches a preset value, and the alarm unit 7 is at least one of a buzzer and a display light.

[0030] like Figure 2 As shown, the controller 3 in this embodiment uses a chip IC2 model of SC91F841M20U, the alarm unit 7 uses a buzzer Bz1, the controller 3 is programmed through the first port CN1, and the two pins on the second port CN2 correspond to the power input port. There are 5 buttons 5 in this embodiment, which are used to realize different controls respectively; Figure 3 As shown, in this embodiment, the third port CN3 is electrically connected to the gas flow meter 2, the chip U3 used by the operational amplifier 4 is MCP606-I / SN, and the output terminal VOUT of the operational amplifier 4 is electrically connected to the controller 3; Figure 4 and Figure 5 As shown, the chip IC1 model used by the driving module 63 is TM1640, and the first digital tube 61 and the second digital tube 62 both use 3-bit 7-segment digital tubes. Figures 2 to 5 The circuit shown can automatically achieve accurate readings of the gas flow meter.

[0031] Embodiment 2:

[0032] Different from the first embodiment, the controller 3 in this embodiment is electrically connected to a human-machine interaction unit, and the human-machine interaction unit has at least one of the above-mentioned buttons 5, display unit 6, alarm unit 7 and filter unit.

Claims

1. A control system for a gas flow meter, characterized in that include: A pulse detection module (1) is electrically connected to the gas flow meter (2) and is used to detect a pulse signal generated when the gas flow meter (2) is working; The controller (3) is electrically connected to the pulse detection module (1) and is configured to generate a metering result of the gas flow meter (2) according to the detection result of the pulse detection module (1).

2. The control system according to claim 1, characterized in that: The control system further comprises an operational amplifier (4) for amplifying the pulse signal, wherein the input end of the operational amplifier (4) is electrically connected to the output end of the pulse detection module (1), and the output end of the operational amplifier (4) is electrically connected to the control port of the controller (3).

3. The control system according to claim 2, characterized in that: The controller (3) is electrically connected to a button (5) for setting a timing time and starting timing.

4. The control system according to claim 3, characterized in that: The controller (3) is also electrically connected to a display unit (6), and the display unit (6) is used to display the measurement time of the gas flow meter (2) and the measurement result of the gas flow meter (2).

5. The control system according to claim 4, characterized in that: The display unit (6) comprises a first digital tube (61) for displaying the metering time of the gas flow meter (2) and a second digital tube (62) for displaying the metering result of the gas flow meter (2), wherein the first digital tube (61) and the second digital tube (62) are both electrically connected to the output end of the controller (3) via a driving module (63).

6. The control system according to claim 5, characterized in that: The control system further comprises an alarm unit (7) for alarming, and the alarm unit (7) is electrically connected to the controller (3).

7. The control system according to claim 6, characterized in that: The alarm unit (7) is at least one of a buzzer and a display light.

8. The control system according to claim 6, characterized in that: The output end of the pulse detection module (1) is also connected to a filtering unit for filtering the pulse signal.

9. The control system according to claim 8, characterized in that: The controller (3) is electrically connected to a human-machine interaction unit, and the human-machine interaction unit comprises at least one of the above-mentioned buttons (5), display unit (6), alarm unit (7) and filter unit.

10. The control system according to any one of claims 1 to 9, characterized in that: The gas flow meter (2) is a wet gas flow meter.

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