Verification system and flowmeter

Abstract

The utility model provides a verification system and a flow meter, the flow meter is configured to be capable of driving a counting wheel to rotate in the circumferential direction of the counting wheel when fluid flows through the flow meter, a plurality of continuous indexing intervals are arranged in the circumferential direction of the counting wheel, each indexing interval is provided with an identification part, and the ventilation capacity is determined according to the identification parts on the indexing intervals during verification. According to the flow meter, the counting wheel is divided into smaller metering units, the verification efficiency can be improved, the rotation volume of the flow meter can be matched conveniently, and the verification accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the instrument calibration technology, and particularly to a calibration system and a flow meter. BACKGROUND

[0002] The prior art needs to pass the detection gas to the flow meter when calibrating the flow meter, such as the diaphragm gas meter, and judges whether the flow meter is qualified by the flow detected by the flow meter and the flow detected by the flow standard device.

[0003] Specifically, during detection, the flow standard device obtains the display volume value of the flow meter to be detected by collecting the flow meter runner, and the current sampling technology can only collect one pulse per revolution of the runner. Since a large amount of air is required for one revolution of the runner of the flow meter, a lot of unnecessary time is wasted when detecting small flow, and the calibration efficiency is low. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a calibration system and a flow meter capable of improving calibration efficiency.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a flow meter, comprising:

[0007] The flow meter has a counting wheel, and the flow meter is configured to drive the counting wheel to rotate around the circumference when the fluid flows through the flow meter, and the circumference of the counting wheel is provided with a plurality of continuous division intervals, and each division interval is provided with an identification part, and the flow meter is configured to pass a determined amount of air according to the identification part on the division interval during calibration.

[0008] As an optional implementation, the central angle corresponding to each division interval is less than or equal to 36°.

[0009] As an optional implementation, the division value of each division interval is configured to be greater than or equal to 0.1L and less than or equal to 1L.

[0010] As an optional implementation, the following relationship is satisfied among the revolution volume V of the flow meter, the division value v of the division interval, and the number N of the division intervals:

[0011] V=v*n, wherein n is a positive integer, and n

[0012] As an optional implementation, the plurality of division intervals are divided into a plurality of groups of continuous division regions according to a preset number.

[0013] The plurality of division regions are provided with continuous sequential identification.

[0014] In a second aspect, the present application provides a calibration system, comprising:

[0015] The flow meter according to any one of the preceding aspects;

[0016] The identification part is opposite to the counting wheel, and has an identification area. The identification part is configured to detect the number of the identification parts passing through the identification area.

[0017] The control part is electrically connected with the identification part, and is configured to determine the flow value of the counting wheel according to the number of the identification parts passing through the identification area.

[0018] As an optional implementation, the identification parts of the two adjacent indexing intervals are configured to be different in color.

[0019] As an optional implementation, the identification parts on both sides of any identification part are configured to be the same in color.

[0020] The identification parts of the two adjacent indexing intervals are configured to be complementary in color; and / or,

[0021] The identification parts of the two adjacent indexing intervals are respectively configured to be black and white.

[0022] As an optional implementation, the identification parts of the two adjacent indexing intervals are configured to be different in pattern.

[0023] As an optional implementation, the identification part is configured to be any one of an image sampler, a color bar sensor and a color sensor.

[0024] The verification system of the present application, the counting wheel is circumferentially provided with a plurality of continuous indexing intervals, and the indexing intervals are provided with identification parts. The ventilation volume of the counting wheel can be read through the identification parts when the counting wheel rotates less than one circle. That is, the whole circle measurement number of the counting wheel is divided into a plurality of smaller indexing intervals. The preset ventilation value of the test gas can be set smaller during verification, so as to effectively improve the verification efficiency and accelerate the delivery and use of the product.

[0025] In addition, the present application provides a verification system. The verification system is provided with identification parts on each indexing interval, the identification part is opposite to the counting wheel, the identification part can detect the number of the identification parts passing through the identification area, and the control part can determine the flow value of the flow meter according to the number of the identification parts passing through the identification area. In this way, the whole circle measurement value of the counting wheel can be subdivided into smaller indexing values. The number of rotations of the identification parts of the indexing intervals is identified by the identification part, and then the control part is used for calculation to obtain the measurement value of the counting wheel when less than one circle. In this way, the verification efficiency can be improved, and the rotation volume of the gas meter can be matched, so as to improve the accuracy of the verification. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0027] Fig. 1 A schematic diagram of the principle of the verification system in one embodiment of the present application;

[0028] Fig. 2 A schematic diagram of the flow meter being verified in the verification system in one embodiment of the present application;

[0029] Fig. 3 A schematic diagram of the counting wheel in the verification system in one embodiment of the present application.

[0030] Explanation of reference signs:

[0031] 100, flow meter; 110, counting wheel; 112, division interval; 113, identification part; 200, identification part; 210, identification area; 300, control part. DETAILED DESCRIPTION

[0032] In the prior art, when verifying a diaphragm gas meter, a test gas needs to be introduced into the flow meter, and whether the flow meter is qualified is determined by the gas flow detected by the flow meter and the actual flow. During the detection, the amount of gas introduced for one revolution of the rotating wheel of the flow meter is a liters, and a can be 10, 50, 100, etc. The flow standard device collects the display volume value of the flow meter under test by sampling the rotating wheel. The current sampling technology can only collect one pulse for one revolution of the rotating wheel. When detecting a small flow, a lot of time is spent, and the verification efficiency is low.

[0033] In order to overcome the defects in the prior art, the verification system of the present application, the counting wheel is circumferentially provided with a plurality of continuous division intervals, and the division intervals are provided with identification parts. The amount of gas introduced by the counting wheel can be read through the identification parts without one revolution of the counting wheel, that is, the measurement number of the counting wheel for one revolution is divided into a plurality of smaller division intervals. When verifying, the preset gas introduction value of the test gas can be set smaller, effectively improving the verification efficiency and accelerating the delivery of the product for use.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the specific embodiments of the present application with the drawings to further describe the present application. Figs. 1 to 3The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] This application also provides a flow meter 100, which has a counting wheel 110. The flow meter 100 is configured to drive the counting wheel 110 to rotate circumferentially when fluid flows through the flow meter 100. The counting wheel 110 is provided with a plurality of continuous scale intervals 112 in the circumferential direction. Each scale interval 112 is provided with a marking part 113. The flow meter 100 is configured to determine the air flow rate according to the marking part 113 on the scale interval 112 during calibration.

[0036] In some embodiments, when calibrating the flow meter 100, after connecting the flow meter 100 to the gas supply unit, the gas supply unit provides a stable and precisely controllable gas flow rate. The counting wheel 110 of the flow meter 100 can rotate circumferentially under the action of airflow, and the counting wheel 110 is designed to display the accumulated gas flow rate value flowing through it. When the flow rate displayed by the counting wheel 110 is within a certain error range from the flow rate provided by the gas supply unit, the counting wheel 110 is deemed to have passed the test; otherwise, it is deemed to have failed.

[0037] In some specific embodiments, Vm represents the gas flow rate accumulated by the counting wheel 110, Vs represents the gas flow rate supplied by the gas supply unit, and E represents the error value. The error value E is calculated using the following formula: E = (Vm - Vs) / Vs × 100%. When E is within the MPE (Max Permissible Error), the flow meter is deemed to have passed the test; otherwise, it is deemed to have failed.

[0038] In this embodiment, the flow meter 100 is equipped with a counting wheel 110 specifically for calibration. The counting wheel 110 has multiple continuous graduation intervals 112 arranged circumferentially, and each graduation interval 112 is provided with a marking part 113. That is, the multiple graduation intervals 112 can divide the entire circle of the counting wheel 110 into smaller measuring units. In this way, the air volume represented when the counting wheel 110 has not rotated a full circle can be obtained by manually or by machine by identifying the marking parts 113 on the multiple graduation intervals 112. Therefore, when designing calibration rules, it is not necessary to make the counting wheel 110 rotate a full circle, thus improving calibration efficiency.

[0039] The inventors discovered that in traditional testing, because flow meters are generally decimal (typically, the airflow required for one revolution of the counting wheel is 10L, 50L, 100L, etc.), the flow standard device obtains the displayed volume value of the flow meter under test by collecting data from the rotating wheel. However, current sampling technology can only collect one pulse per revolution of the wheel, resulting in long testing times and low efficiency when testing smaller flow rates. For example, the lowest flow point for a G1.6 gas meter is 0.016m³. 3 / h, when the gas meter is tested to be supplied with the minimum flow rate, the time required for the counting wheel 110 to rotate one revolution (10L) is 37.5min. Therefore, the traditional verification method is time-consuming and inefficient, which affects the delivery and use of the product.

[0040] In this embodiment of the flow meter 100, the counting wheel 110 is circumferentially divided into multiple continuous graduation intervals 112. This means the total measurement of one revolution of the counting wheel 110 is divided into multiple smaller graduation intervals 112. For example, if the counting wheel 110 has 50 continuous and uniform graduation intervals 112, then when the airflow represented by one revolution of the counting wheel 110 is 10L, each graduation interval 112 represents an airflow of 0.2L. This is at the lowest flow point (0.016m) when calibrating a G1.6 gas meter. 3 When the gas meter is tested at a flow rate of 3.6L / h, the preset flow rate of the test gas can be set to a smaller value, such as 3.6L. This way, when the gas meter is tested at the lowest flow rate, the calibration can be completed in just 13.5 minutes, which effectively improves the calibration efficiency and speeds up the delivery and use of the product.

[0041] In some embodiments, the central angle corresponding to each scale interval 112 is less than or equal to 36°.

[0042] This design limits the scale value of each scale interval 112 to prevent the division from being too coarse and to ensure a wider range of ventilation parameters.

[0043] For example, when the central angle corresponding to the scale interval 112 is set to 36°, for the counting wheel 110 which represents 10L per revolution, the scale value of each interval 112 is 1L.

[0044] For example, when the central angle corresponding to the scale interval 112 is set to 7.2°, for the counting wheel 110 which represents 10L per revolution, the scale value of each interval 112 is 0.2L.

[0045] In some embodiments, the scale value of each scale interval 112 is configured to be greater than or equal to 0.1L and less than or equal to 1L, for example 0.1L, 0.2, 0.25L, 0.3, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L, 1L.

[0046] In some embodiments, the rotational volume V of the flow meter 100, the scale value v of the scale interval 112, and the number N of the scale intervals 112 satisfy the following relationship: V = v * n, where n is a positive integer and n < N.

[0047] When calibrating diaphragm gas meters, the gas flow rate is usually required to be an integer multiple of the rotational volume V (when gas flows into the meter, it pushes the diaphragm to reciprocate, and the mechanism connected to the diaphragm drives a device similar to a crank connecting rod, causing the rotating body inside the meter to rotate. Each rotation discharges a certain volume of gas, which is the rotational volume of the diaphragm gas meter).

[0048] Diaphragm gas meters typically come in different sizes, such as 1.2L and 0.9L. However, 10L is not an integer multiple of the rotation volume of these conventional diaphragm gas meters. Therefore, in the traditional calibration process, rotating the counting wheel 110 an integer number of times may affect the accuracy of the calibration.

[0049] In this embodiment, the rotational volume V of the flow meter 100, the scale value v of the scale interval 112, and the number N of the scale interval 112 satisfy the above relationship. That is, when the scale interval 112 rotates through n intervals, it can represent the rotational volume, which makes it easier to determine the value of the ventilation volume and makes the calibration result more accurate.

[0050] As in the example above, when the rotational volume of the gas meter is 1.2L, the counting wheel 110 is set with 50 continuous and uniform scale intervals 112 along the circumference, that is, the gas flow rate represented by each scale interval 112 is 0.2L. The volume of the test gas is set to 3.6L, which is also 3 times the rotational volume of 1.2L. This allows the gas flow rate to match the requirements of the rotational volume, thus improving the accuracy of the calibration.

[0051] For example, when the gas meter's rotational volume is 1.5L, the counting wheel 110 is set with 40 continuous and uniform scale intervals 112 along the circumference, meaning that each scale interval 112 represents a gas flow rate of 0.25L. The volume of the test gas is set to 4.5L, which is also three times the rotational volume of 1.5L. This ensures that the gas flow rate matches the rotational volume requirement, improving the accuracy of the calibration.

[0052] Therefore, the flow meter 100 of this embodiment, since each scale interval 112 is provided with an identification part 113, can subdivide the full rotation measurement value of the counting wheel 110 into smaller scale values. The identification part 200 identifies the number of rotations of the identification part 113 in the scale interval 112, and the control part 300 calculates the measurement value of the counting wheel 110 when it is less than one rotation. This not only improves the calibration efficiency, but also makes it easier to match the rotation volume of the gas meter, thus improving the accuracy of the calibration.

[0053] In some embodiments, the plurality of graduation intervals 112 are divided into multiple groups of continuous graduation regions according to a preset number. Continuous markers are provided at each of the multiple graduation regions.

[0054] In some specific embodiments, one rotation of the counting wheel 110 represents a ventilation volume of 10L. The counting wheel 110 has 50 continuous and evenly spaced graduations 112 circumferentially, each graduation 112 representing a ventilation volume of 0.2L. Every five graduations 112 form a graduation area, thus the counting wheel 110 has 10 graduation areas, each representing a ventilation volume of 1L. Multiple graduation areas are marked with consecutive serial numbers, allowing them to be sequentially marked from 1 to 10, facilitating readings during calibration.

[0055] This application also provides a calibration system including a flow meter 100, an identification unit 200, and a control unit 300. The flow meter 100 has a counting wheel 110, configured to rotate circumferentially when fluid flows through it. The counting wheel 110 has multiple consecutive graduation intervals 112 circumferentially arranged, each graduation interval 112 having a marking portion 113. The identification unit 200 faces the counting wheel 110 and has an identification area 210. The identification unit 200 is configured to detect the number of marking portions 113 passing through the identification area 210. The control unit 300 is electrically connected to the identification unit 200 to determine the flow rate value of the flow meter 100 based on the number of marking portions 113 passing through the identification area 210.

[0056] In some embodiments, the calibration system may further include a gas supply unit, which, after connecting the flow meter 100 to the gas supply unit, provides a stable and precisely controllable gas flow rate. The counting wheel 110 of the flow meter 100 can rotate circumferentially under the action of airflow, and the counting wheel 110 is designed to display the accumulated gas flow rate value flowing through it. If the flow rate displayed by the counting wheel 110 is within a certain error range from the flow rate provided by the gas supply unit, the counting wheel 110 is deemed to have passed the test; otherwise, it is deemed to have failed.

[0057] In some specific embodiments, Vm represents the gas flow rate accumulated by the counting wheel 110, Vs represents the gas flow rate supplied by the gas supply unit, and E represents the error value. The error value E is calculated using the following formula: E = (Vm - Vs) / Vs × 100%. When E is within the MPE (Max Permissible Error), the flow meter is deemed to have passed the test; otherwise, it is deemed to have failed.

[0058] The inventors discovered that during testing, since flow meters are generally decimal, the air volume required for one revolution of the counting wheel (110) is typically 10L, 50L, or 100L. The flow standard device obtains the displayed volume value of the flow meter under test by collecting data from the rotating wheel. However, current sampling technology can only collect one pulse per revolution of the wheel, resulting in long testing times and low efficiency when testing smaller flow rates. For example, the lowest flow point for a G1.6 gas meter is 0.016m³. 3 / h, when the gas meter is tested to be supplied with the minimum flow rate, the time required for the counting wheel 110 to rotate one revolution (10L) is 37.5min. Therefore, the traditional verification method is time-consuming and inefficient, which affects the delivery and use of the product.

[0059] In this embodiment, the counting wheel 110 is provided with a plurality of continuous graduation intervals 112 in its circumference, that is, the total number of measurements of the counting wheel 110 is divided into a plurality of smaller graduation intervals 112, and each graduation interval 112 is provided with a marking part 113. The identification part 200 is opposite to the counting wheel 110 and is configured to detect the number of marking parts 113 passing through the identification area 210. The control part 300 is electrically connected to the identification part 200 to determine the flow rate value of the flow meter 100 based on the number of marking parts 113 passing through the identification area 210.

[0060] In other words, in this embodiment, the counting wheel 110 is subdivided into multiple smaller graduation intervals 112, and the identification unit 200 and the control unit 300 identify the marking unit 113 on the graduation interval 112 to detect the ventilation volume represented when the counting wheel 110 does not rotate one revolution. In this way, the verification can be achieved without the counting wheel 110 rotating one revolution.

[0061] Specifically, the identification unit 200 has an identification area 210, which is stationary relative to the counting wheel 110. When the counting wheel 110 rotates, at least one graduation interval 112 passes through the identification area 210. The identification unit 200 can identify the number of times the marking part 113 on the graduation interval 112 passes through its identification area 210. The identification unit 200 transmits the detected number of times the identification area 210 passes to the control unit 300, which obtains the accumulated flow value of the counting wheel 110 based on the preset graduation value of the graduation interval 112 and the number of times the identification area 210 passes.

[0062] In this way, during the calibration process, the accumulated flow rate value of the counting wheel 110 can be observed intuitively without the counting wheel 110 needing to rotate an integer number of times. This can reduce the flow rate of the ventilation gas and save time when testing smaller flow rates.

[0063] In some specific application scenarios, the counting wheel 110 has 50 continuous and evenly spaced graduations 112 in its circumference. Therefore, when one rotation of the counting wheel 110 represents a gas flow of 10L, each graduation 112 represents a gas flow of 0.2L. This is at the lowest flow point (0.016m) required for calibrating the G1.6 gas meter. 3 When the flow rate is less than one revolution of the counting wheel 110, the flow rate can be read by the control unit 300. Therefore, the preset flow rate of the test gas can be set to a smaller value, such as 3.6L. In this way, when the gas meter is tested with the minimum flow rate, the calibration can be completed in just 13.5 minutes, which greatly improves the calibration efficiency and speeds up the delivery and use of the product.

[0064] In some embodiments, the marking portions 113 of two adjacent division intervals 112 are configured to have different colors. The recognition unit 200 is configured to determine the number of marking portions 113 passing through the recognition area 210 based on the color change of the marking portions 113.

[0065] In this embodiment, when the counting wheel 110 rotates, the marking portions 113 on the scale interval 112 pass through the recognition area 210 in sequence. Since the marking portions 113 of two adjacent scale intervals 112 are configured with different colors, the recognition unit 200 can continuously acquire images at the recognition area 210 and determine the number of times the scale intervals 112 have passed based on the color values ​​of the acquired images.

[0066] In other words, as long as the recognition unit 200 can detect a color change, it is considered that a division interval 112 has passed through the recognition area 210, thus realizing the recognition unit 200 to recognize the number of rotations of the marking unit 113 in the division interval 112.

[0067] Furthermore, the marking portions 113 on both sides of any marking portion 113 are configured with a coating of the same color.

[0068] As can be seen from the above, when the recognition unit 200 recognizes the number of rotations of the marking unit 113 in the division interval 112, it is enough to accumulate one time as long as a color change is detected between two adjacent marking units 113. Therefore, it is only necessary to ensure that there is a color difference between two adjacent marking units 113.

[0069] In this embodiment, while ensuring that two adjacent recognition units 200 have a color difference, the spaced-apart marking units 113 are configured with a coating of the same color. This reduces the number of color types used and further reduces the number of reference colors set for the recognition units 200, which is beneficial for more accurate detection of color changes.

[0070] Furthermore, based on the color difference between two adjacent identification sections 200, the spaced-apart marking sections 113 are configured with the same color coating. That is, the entire circle of the counting wheel 110 uses only two colors, which simplifies the difficulty of color arrangement and enhances aesthetics.

[0071] In some embodiments, the marking portions 113 of two adjacent division intervals 112 are configured to be complementary colors.

[0072] In optics, when two colors of light are mixed in an appropriate ratio to produce white light, these two colors are called "complementary colors," such as red-green, yellow-violet, and blue-orange. Complementary colors have strong contrast and are easier for sensors to recognize. Therefore, in this embodiment, the marking portions 113 of two adjacent graduation intervals 112 are configured with complementary color coatings, which helps the recognition unit 200 to more accurately recognize color changes.

[0073] In some embodiments, the marking portions 113 of two adjacent graduation intervals 112 are respectively configured with a black coating and a white coating.

[0074] In the color system, black and white have a certain special relationship. In the RGB color mode, the RGB value of black is (0,0,0) and the RGB value of white is (255,255,255). The RGB colors of the two are significantly different, making them easier for the sensor to recognize. Therefore, in this embodiment, the marking part 113 of two adjacent division intervals 112 is configured with a black coating and a white coating, which helps the recognition part 200 to recognize color changes more accurately.

[0075] In some embodiments, the recognition unit 200 is configured as any one of an image sampler, a color mark sensor, and a color sensor.

[0076] Specifically, an image sampler extracts discrete sample points from a continuous image signal, converting analog images into digital images for computer processing and analysis. Through sampling, the image is decomposed into a finite number of pixels, each with specific attributes such as location and color value, thus representing the image information in digital form and laying the foundation for subsequent image processing, analysis, and storage operations.

[0077] As the counting wheel 110 rotates, the marking portions 113 on the scale interval 112 pass through the recognition area 210 in sequence. Since the marking portions 113 of two adjacent scale intervals 112 are configured with coatings of different colors, the image sampler can continuously acquire images at the recognition area 210, convert analog images into digital images, and determine the number of times the scale interval 112 has passed based on the color values ​​of the digital images.

[0078] Color mark sensors work primarily by comparing the emissivity differences between objects of different colors to detect changes in the grayscale value of the target object's surface. They pay particular attention to grayscale differences in pattern colors and dynamic changes in grayscale values.

[0079] Grayscale values ​​reflect the brightness of a color. Therefore, when using a color-changing sensor as the recognition unit 200, the marking units 113 of two adjacent division intervals 112 can be further configured as coatings with significant differences in color depth. For example, one color can be set to a light color (such as white, yellow, etc.), and the other can be set to a dark color (such as black, dark blue, etc.).

[0080] The color sensor emits light through a built-in emitter and detects the light reflected back from an object using a receiver. The reflected light is then broken down into the three primary colors: red, green, and blue, and precisely compared with preset standard colors. This process enables the color sensor to identify and compare the color of a target object, thus achieving accurate color detection. The color sensor can directly identify colors and thus detect changes between two adjacent marking sections 113.

[0081] In some embodiments, the marking portions 113 of two adjacent graduation intervals 112 are configured as different pattern layers. When the counting wheel 110 rotates, the marking portions 113 on the graduation intervals 112 pass through the recognition area 210 in sequence. The image sampler can acquire image signals, convert the analog image into a digital image, and then extract image elements from the pattern layer in the digital image. Each change is counted as a single change whenever the extracted image element changes.

[0082] In some specific embodiments, multiple pattern layers are configured as sequential identifiers, such as Arabic numerals.

[0083] In some specific embodiments, the marking portions 113 on both sides of any marking portion 113 are configured with the same pattern layer.

[0084] When the identification unit 200 identifies the number of rotations of the marking unit 113 in the indexing interval 112, it can accumulate one time as long as it identifies a change in the pattern layer between two adjacent marking units 113. Therefore, it is only necessary to ensure that the patterns of two adjacent marking units 113 are different.

[0085] In this embodiment, while ensuring that two adjacent identification parts 113 have different patterns, the spaced-apart identification parts 113 are configured with the same pattern layer. This reduces the number of pattern types used and further reduces the number of reference patterns set by the identification part 200, which is beneficial for more accurate detection of pattern changes.

[0086] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0087] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0088] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0089] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A flow meter (100), characterized in that, The flow meter (100) has a counting wheel (110) and is configured to drive the counting wheel (110) to rotate circumferentially when fluid flows through the flow meter (100). The counting wheel (110) is provided with a plurality of continuous scale intervals (112) in the circumferential direction. Each scale interval (112) is provided with a marking part (113). The flow meter (100) is configured to determine the air flow rate according to the marking part (113) on the scale interval (112) during calibration.

2. The flow meter (100) according to claim 1, characterized in that, The central angle corresponding to each of the aforementioned scale intervals is less than or equal to 36°.

3. The flow meter (100) according to claim 1, characterized in that, The scale value of each scale interval (112) is configured to be greater than or equal to 0.1L and less than or equal to 1L.

4. The flow meter (100) according to claim 1, characterized in that, The rotational volume V of the flow meter (100), the scale value v of the scale interval (112), and the number N of the scale intervals (112) satisfy the following relationship: V = v * n, where n is a positive integer and n < N.

5. The flow meter (100) according to claim 1, characterized in that, The multiple scale intervals (112) are divided into multiple groups of continuous scale regions according to a preset number; A series of sequential identifiers are provided at multiple of the aforementioned grading regions.

6. A verification system, characterized in that, include: The flow meter (100) according to any one of claims 1 to 5; An identification unit (200) is positioned opposite the counting wheel (110). The identification unit (200) has an identification area (210) and is configured to detect the number of the identification units (113) passing through the identification area (210). A control unit (300) is electrically connected to the identification unit (200) to determine the flow rate of the counting wheel (110) based on the number of the identification units (113) passing through the identification area (210).

7. The verification system according to claim 6, characterized in that, The markings (113) of two adjacent graduation intervals (112) are configured with different colors; and, The identification unit (200) is configured to determine the number of the identification units (113) passing through the identification area (210) based on the color change of the identification units (113).

8. The verification system according to claim 7, characterized in that, The marking portions (113) on both sides of any one of the marking portions (113) are configured to have the same color; The markings (113) of two adjacent graduation intervals (112) are configured with complementary colors; and / or, The marking portions (113) of two adjacent graduation intervals (112) are respectively configured with a black coating and a white coating.

9. The verification system according to claim 6, characterized in that, The marking portions (113) of two adjacent graduation intervals (112) are configured with different pattern layers; The identification unit (200) is configured to determine the number of the identification units (113) passing through the identification region (210) by detecting changes in the pattern layer.

10. The verification system according to claim 6, characterized in that, The recognition unit (200) is configured as any one of an image sampler, a color mark sensor, and a color sensor.

Images