Digital flow sensor

Abstract

The utility model belongs to the technical field of flow sensors, and discloses a digital flow sensor which comprises a main body upper shell, a display fixing middle frame is arranged on the inner wall of the main body upper shell, a main body lower shell is arranged on the outer side of the main body upper shell, and a second main board is arranged in the main body lower shell. A reinforcing plate located below the second main board is arranged on the inner wall of the lower main body shell. According to the utility model, the main board II and the induction air channel are arranged and are connected to the medium interface through the air inlet pipe, air flow passes through the induction air channel, and analog signals are directly converted into digital signals through the ADC arranged on the main board II, so that noise interference in the transmission process is reduced, the measurement precision is improved, and meanwhile, the flow change can be rapidly detected and corresponding response can be made; and discrete digital signals are smoothed through a digital filtering algorithm, so that random noise is effectively suppressed, real flow characteristics are reserved, and the influence of the noise on a measurement result is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flow sensor technical field, specifically a digital flow sensor. BACKGROUND

[0002] Flow sensor is a kind of instrument for measuring gas flow rate or flow, is widely used in industry, energy, environmental protection, medical treatment and other fields, its core function is to convert the physical quantity of fluid into identifiable electric signal, to display, control and data processing;

[0003] The flow sensor in prior art is used, by connecting inlet pipe to sensor interface, the sensor in the inside detects flow rate and flow, the speed of the sensing blade is proportional to flow rate, and the speed is converted into pulse signal by magnetoelectric induction device to carry out signal transmission, however, when the flow sensor is used, it is susceptible to electromagnetic interference and line impedance when long-distance signal transmission, signal distortion is caused, and the accuracy of data detection is influenced, so it needs to be improved. SUMMARY

[0004] To solve the problems in the above background art, the utility model provides a kind of digital flow sensor.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of digital flow sensor, including main body upper shell, the display fixed frame is arranged on the inner wall of main body upper shell, the main body lower shell is arranged on the outer side of main body upper shell, the main board two is arranged in the inside of main body lower shell, the reinforcing plate located below main board two is arranged on the inner wall of main body lower shell, the sensor core circuit board is arranged in the bottom of reinforcing plate, the medium interface is opened in the inside of main body lower shell, the sensing air passage located above medium interface is opened in the inside of main body lower shell, and the sensing slot is opened in the inside of main body lower shell.

[0006] Preferably, the main body lower shell top is provided with sealing ring outside the sensing air passage, and the sensor core circuit board bottom is movably connected with the sealing ring top.

[0007] Preferably, the display fixed frame top is provided with LCD display screen, and the both sides of LCD display screen are provided with keys.

[0008] Preferably, the keys are sleeved with transparent protective plate outside, and the transparent protective plate top extends to the outer side of main body upper shell.

[0009] Preferably, the display fixed frame bottom is provided with main board one, the main board one top is provided with fixed support middle frame, and the fixed support middle frame bottom is connected with the main board two top.

[0010] Preferably, the medium interface is internally provided with a filter screen one, the induction airway is internally provided with a filter screen two, and the main body lower shell inner cavity is provided with a connecting pipe locking snap ring.

[0011] Preferably, the main body upper shell bottom and the main body lower shell top are matched with each other, the main body upper shell outer side is provided with a clamping groove, and the main body lower shell outer side is provided with a clamping block.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] The utility model is provided with mainboard two and induction airway, through connecting on medium interface through air inlet pipe, air current passes through induction airway, through setting ADC on mainboard two, analog signal is converted into digital signal directly, reduce noise interference in transmission process, improve measurement precision, can detect flow change and make corresponding response fast, through digital filter algorithm carries out smooth processing to discrete digital signal, effectively suppresses random noise, keeps real flow characteristic, reduces influence of noise on measurement result. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is whole structure schematic view of the utility model;

[0015] Fig. 2 It is structure explosion drawing of the utility model;

[0016] Fig. 3 It is structure schematic view of main body lower shell of the utility model.

[0017] In the drawing: 1, main body upper shell;2, display fixed middle frame;3, LCD display screen;4, mainboard one;5, button;6, transparent protection plate;7, main body lower shell;8, fixed support middle frame;9, mainboard two;10, reinforcing plate;11, sensor core circuit board;12, sealing ring;13, medium interface;14, connecting pipe locking snap ring;15, induction airway;16, induction notch;17, filter screen one;18, filter screen two. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] Embodiment 1

[0020] As Figs. 1 to 3As shown, it is the first embodiment of the utility model, provide a kind of digital flow sensor, including main upper shell 1, display fixed middle frame 2 is arranged on the inner wall of main upper shell 1, main lower shell 7 is arranged on the outer side of main upper shell 1, main board two 9 is arranged in the inside of main lower shell 7, reinforcing plate 10 is arranged in the inner wall of main lower shell 7 below main board two 9, sensor core circuit board 11 is arranged in the bottom of reinforcing plate 10, medium interface 13 is opened in the inside of main lower shell 7, sensing airway 15 is opened in the inside of main lower shell 7 above medium interface 13, sensing notch 16 is opened in the inside of main lower shell 7;

[0021] When digital flow sensor operates, it is connected with medium interface 13 by inlet pipe and outlet pipe, air flow is guided into the inside of sensing airway 15 by aeration to the connected pipeline, and sensor core circuit board 11 operates to detect the flow at sensing notch 16, and the collected data is processed by main board two 9, which uses ADC analog-digital converter to directly convert analog signal into digital signal, reduces noise interference in transmission process, improves measurement accuracy, and carries out smoothing processing to discrete digital signal by digital filtering algorithm, effectively suppresses random noise, retains real flow characteristics, reduces the influence of noise on measurement results, and generally between tens of milliseconds to several hundred milliseconds, flow change can be quickly detected and corresponding response is made, and main board two 9 has automatic calibration and compensation, for automatically calibrating zero drift and temperature drift, real-time compensation is carried out by temperature sensor, the influence of environmental temperature change is small, long-term operation is stable, error in long-term use is reduced, and problems such as overcurrent, overvoltage, overload and excessive range are automatically detected and fault code is reported.

[0022] Embodiment 2

[0023] As Fig. 2 and Fig. 3 shown, the embodiment includes the characteristics of embodiment 1, and the difference is that sealing ring 12 is arranged on the top of main lower shell 7 outside sensing airway 15, and sensor core circuit board 11 is movably connected with the top of sealing ring 12;

[0024] Sealing ring 12 seals the outside of sensing airway 15, forms a physical barrier to prevent the measured air flow from leaking from the connection, avoids inaccurate detection of air flow and flow rate, and ensures long-term stable operation of the sensor.

[0025] Wherein, LCD display screen 3 is arranged on the top of display fixed middle frame 2, and keys 5 are arranged on both sides of LCD display screen 3;

[0026] The current value can be clearly and intuitively displayed through the LCD display screen 3, so as to facilitate the real-time monitoring of the operator, and the upper and lower limits, the return difference value and other parameters of the flow can be set through the key 5, zero calibration and full-scale calibration can also be performed, the operation is simple, and the required value can be quickly and accurately set.

[0027] The transparent protective plate 6 is sleeved outside the key 5, and the top of the transparent protective plate 6 extends to the outside of the main upper shell 1;

[0028] The transparent protective plate 6 protects the LCD display screen 3 from damage caused by collision, avoids data reading failure, and improves readability in sunlight by performing anti-glare treatment on the edge of the transparent protective plate 6.

[0029] The main board one 4 is arranged at the bottom of the display fixed middle frame 2, and the fixed support middle frame 8 is arranged at the top of the main board one 4, and the bottom of the fixed support middle frame 8 is connected with the top of the main board two 9;

[0030] The main board one 4 processes the detected data to display on the LCD display screen 3, which is convenient for the operator to observe, and the main board one 4, the display fixed middle frame 2, the LCD display screen 3, the key 5 and the transparent protective plate 6 are combined in the main upper shell 1 by the fixed support middle frame 8, which is convenient for the main upper shell 1 and the main lower shell 7 to be buckled together, convenient for installation and use, and the main board one 4 and the main board two 9 are designed with low power consumption, which makes the use more energy-saving.

[0031] The filter screen one 17 is arranged in the medium interface 13, and the filter screen two 18 is arranged in the sensing air duct 15, and the pipe locking buckle ring 14 is arranged in the inner cavity of the main lower shell 7;

[0032] The filter screen two 18 and the filter screen one 17 are used for filtering the gas inlet of the medium interface 13, for uniformly passing and filtering the impurities of the medium to prevent damage to the sensor core, thereby protecting the performance of the product and prolonging the service life of the sensor.

[0033] The bottom of the main upper shell 1 and the top of the main lower shell 7 are matched with each other, the main upper shell 1 is provided with a clamping groove outside, and the main lower shell 7 is provided with a clamping block outside;

[0034] When the main upper shell 1 and the main lower shell 7 are combined together, the clamping block is inserted into the clamping groove by extrusion, so as to complete the assembly and fixation of the main upper shell 1 and the main lower shell 7, and the internal structure is combined in the inner cavity, which is convenient for the operator to use.

[0035] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0036] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A digital flow sensor comprising a main body upper casing (1), characterized in that: The inner wall of the main upper shell (1) is provided with a display fixed middle frame (2), the outer side of the main upper shell (1) is provided with a main lower shell (7), the inside of the main lower shell (7) is provided with a mainboard two (9), the inner wall of the main lower shell (7) is provided with a reinforcing plate (10) below the mainboard two (9), the bottom of the reinforcing plate (10) is provided with a sensor core circuit board (11), the inside of the main lower shell (7) is provided with a medium interface (13), the inside of the main lower shell (7) is provided with an induction airway (15) above the medium interface (13), and the inside of the main lower shell (7) is provided with an induction groove (16).

2. A digital flow sensor according to claim 1, characterized in that: The top of the main lower shell (7) is provided with a sealing ring (12) outside the induction airway (15), and the bottom of the sensor core circuit board (11) is movably connected with the top of the sealing ring (12).

3. A digital flow sensor according to claim 1, characterized in that: The top of the display fixed middle frame (2) is provided with an LCD display screen (3), and the two sides of the LCD display screen (3) are provided with keys (5).

4. A digital flow sensor according to claim 3, wherein: The outer side of the key (5) is sleeved with a transparent protective plate (6), and the top of the transparent protective plate (6) extends to the outer side of the main upper shell (1).

5. A digital flow sensor according to claim 1, characterized in that: The bottom of the display fixed middle frame (2) is provided with a mainboard one (4), and the top of the mainboard one (4) is provided with a fixed support middle frame (8), and the bottom of the fixed support middle frame (8) is connected with the top of the mainboard two (9).

6. A digital flow sensor according to claim 1, characterized in that: The inside of the medium interface (13) is provided with a filter screen one (17), the inside of the induction airway (15) is provided with a filter screen two (18), and the inner cavity of the main lower shell (7) is provided with a pipe locking buckle ring (14).

7. A digital flow sensor according to claim 1, characterized in that: The bottom of the main upper shell (1) and the top of the main lower shell (7) are matched with each other, the outer side of the main upper shell (1) is provided with a clamping groove, and the outer side of the main lower shell (7) is provided with a clamping block.

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