Online calibrating device for small-caliber water meter

Abstract

The utility model relates to an on-line calibrating device for a small-caliber water meter, which comprises a first tank body, a first water inlet is arranged at the side part of the first tank body, the first water inlet is connected to a calibrated water meter through a water inlet pipe, a flow indicating instrument and a flow regulating valve are arranged on the water inlet pipe, and a first water outlet is arranged at the upper part of the first tank body. A first water outlet is formed in the bottom of the first tank body; the first tank body is fixed on the second tank body, a second water inlet is formed in the second tank body, the first water outlet is located above the second water inlet, and a second water outlet is formed in the bottom of the second tank body; when the minimum flow or the boundary flow is calibrated, the calibration medium is only allowed to enter the first tank body for calibration, when the common flow is calibrated, the calibration medium overflows into the second tank body through the first water outlet, and the first tank body and the second tank body are used for calibration together. The water meter is not required to be detached and sent to a laboratory for online verification, the efficiency is high, the cost is low, and the verification process is safe and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of water meter calibration, in particular to an online calibration device for small-caliber water meters. Background Art

[0002] Regarding the calibration of small-diameter water meters, the standard device used for calibration is a water meter calibration device with an accuracy level of 0.2, or a water flow standard device with an expanded uncertainty (k=2) better than 1 / 5 of the absolute value of the maximum allowable error of the water meter. The calibration items include: appearance, logo, seal, electronic device function, sealing and indication error. The calibration flow points are generally Q1, Q2 and Q3, among which Q1 is the minimum flow, Q2 is the boundary flow, and Q3 is the common flow. Although the water meter can be calibrated by the above method, it still faces the following problems: the current water meter calibration devices are large devices fixed in the laboratory, with large volume and heavy weight. They are basically used for the first calibration of the water meter. When the water meter needs to be subsequently calibrated and inspected during use, the water meter must be disassembled and sent to the laboratory for inspection, which will affect the daily water use of the owner and is extremely inconvenient; for small-diameter water meters (DN15-DN25), although the first mandatory calibration is implemented and the use period is limited to 6 years, it is difficult to avoid measurement disputes during use. Once a dispute occurs, dismantling the water meter and sending it for inspection will cause inconvenience to the owner's life, put him in a disadvantaged position, and is not conducive to the fairness and justice of trade settlement; it is still unknown whether the measurement performance of small-caliber water meters can always remain stable and reliable during the 6-year service life. At present, there is a lack of reliable online calibration devices for water meters on the market. Once a measurement dispute occurs, it still needs to be resolved by dismantling it for inspection, which is not only time-consuming but also costly. Therefore, how to develop an online calibration device that does not require the dismantling of the water meter is an urgent problem that needs to be solved. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of the utility model is to provide an online calibration device for small-diameter water meters, comprising a first tank body and a second tank body, through which the minimum flow Q1 or the boundary flow Q2 is calibrated, and the combination of the first tank body and the second tank body is used to calibrate the commonly used flow Q3. When a metering dispute occurs in the water meter and it needs to be calibrated, or when the metering performance of the water meter needs to be spot-checked after a certain period of use, the online calibration device can be carried to the owner's home or next to the water meter for online calibration, without the need to disassemble the water meter and send it to the laboratory for online calibration, which has high efficiency, low cost, and a safe and convenient calibration process.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An online calibration device for a small-diameter water meter comprises: a first tank body, a side portion of the first tank body having a first water inlet for receiving a calibration medium, the first water inlet being connected to the water meter to be tested through a water inlet pipe, a flow indicating instrument and a flow regulating valve being installed on the water inlet pipe, an upper portion of the first tank body having a first water outlet for overflow discharge of the calibration medium, and a bottom portion of the first tank body having a first drain for draining the calibration medium; a second tank body, the first tank body being fixed to the second tank body, the second tank body having a second water inlet for receiving the calibration medium from the first water outlet, the first water outlet being located above the second water inlet so that an overflow connection is formed between the first tank body and the second tank body, and a second drain for draining the calibration medium at the bottom portion of the second tank body; wherein, when calibrating a minimum flow rate or a boundary flow rate, the calibration medium is only allowed to enter the first tank body for calibration, and when calibrating a normal flow rate, the calibration medium overflows into the second tank body through the first water outlet, and the calibration is performed together using the first tank body and the second tank body.

[0006] Furthermore, the first tank body includes a first small tank body and a first large tank body, the top of the first large tank body has a first annular slope, the first large tank body is fixedly connected to the first small tank body through the first annular slope and fluidly communicated, the second tank body includes a second small tank body and a second large tank body, the top of the second large tank body has a second annular slope, the second large tank body is fixedly connected to the second small tank body through the second annular slope and fluidly communicated, the bottom of the first large tank body is fixed on the second annular slope, the first water inlet is located on the side of the first large tank body, the first water outlet is located on the upper part of the first small tank body, the first drain outlet is located at the bottom of the first large tank body, the second water inlet is located at the top of the second large tank body, and the second drain outlet is located at the bottom of the second large tank body.

[0007] Furthermore, the side of the first small tank body and the side of the second small tank body are both provided with a scale and a liquid level indicating glass tube.

[0008] Furthermore, the top of the first small can body has a first traceability port, and the top of the second small can body has a second traceability port, and the height of the first traceability port is the same as that of the second traceability port.

[0009] Furthermore, a level gauge is provided on the top of the second small tank.

[0010] Furthermore, a drain pipe is provided at the first drain outlet, a valve is installed on the drain pipe, and the drain pipe is parallel to the second annular inclined surface.

[0011] Furthermore, a thermometer is provided on the water inlet pipe.

[0012] Furthermore, the bottom of the second tank body has a plurality of supports for support.

[0013] Furthermore, the flow regulating valve is a ball valve, a stop valve, a butterfly valve or a diaphragm valve.

[0014] Furthermore, the flow indicating instrument is a mechanical flow indicating instrument, an electromagnetic flow indicating instrument or an ultrasonic flow indicating instrument.

[0015] The utility model has the following advantages:

[0016] 1. The utility model is used for the online calibration device of small-diameter water meters. When there is a metering dispute in the water meter and it needs to be calibrated, or when the metering performance of the water meter needs to be spot-checked after a certain period of use, the online calibration device can be carried to the owner's home or next to the water meter for online calibration. There is no need to disassemble the water meter and send it to the laboratory for online calibration. It is highly efficient, low-cost, and the calibration process is safe and convenient.

[0017] 2. The online calibration device of the utility model is directly connected to the water supply network. The water source of the water supply network is the real medium required for calibration. The total water consumption of the DN15-DN25 household water meter in the entire calibration process does not exceed 130 liters, which is less than 1 yuan in RMB. There is no need to draw electricity from the owner's home, and the calibration process is safe and convenient.

[0018] 3. The online calibration device of the utility model has a first traceability port and a second traceability port, which can be traced back to the social public measurement standard or the national measurement benchmark through the first traceability port and the second traceability port, with an accuracy level of not less than 0.2. The traceability method is extremely convenient, and water can be introduced from the social public measurement standard to the first tank body through the first traceability port to trace the first tank body. When tracing the combination of the first tank body and the second tank body, water is introduced from the social public measurement standard to the first tank body and the second tank body through the second traceability port to complete the traceability of the combination of the first tank body and the second tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a three-dimensional structural schematic diagram of an online calibration device for small-caliber water meters.

[0020] Figure 2 It is a front view of the online calibration device of the utility model.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the online calibration device of the utility model from another angle.

[0022] Figure 4 It is a schematic diagram of the flow of the utility model for calibrating the commonly used flow rate Q3.

[0023] Figure 5 It is a flow chart of verifying the minimum flow rate Q1 and the boundary flow rate Q2 of the utility model.

[0024] Among them, 1 is the first tank body, 1a is the first large tank body, 1b is the first small tank body, 1c is the first annular slope, 101 is the first water inlet, 102 is the water inlet pipe, 103 is the first water outlet, 104 is the first drain outlet, 105 is the first tracing port, 106 is the drain pipe, 2 is the second tank body, 2a is the second large tank body, 2b is the second small tank body, 2c is the second annular slope, 201 is the second water inlet, 202 is the second drain outlet, 203 is the second tracing port, 204 is a spirit level, 205 is a support, 3 is a flow indicating instrument, 4 is a flow regulating valve, 5 is a thermometer, 6 is a scale ruler, and 7 is a liquid level indicating glass tube. DETAILED DESCRIPTION

[0025] The following description is essentially only exemplary and is not intended to limit the present invention, its application or use. It will be further understood that the term "include" and / or "comprising" specifies the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but does not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or its groups or add one or more other features, wholes, steps, operations, elements, parts and / or its groups. As used in this article, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, component or part discussed below can be referred to as the second element, component or part without departing from the teaching of the utility model. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meanings as those commonly understood by those of ordinary skill in the field to which the utility model belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0026] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1-3 As shown, an online calibration device for a small-diameter water meter comprises: a first tank body, a side portion of the first tank body having a first water inlet for receiving a calibration medium, the first water inlet being connected to the water meter to be tested through a water inlet pipe, a flow indicating instrument and a flow regulating valve being installed on the water inlet pipe, an upper portion of the first tank body having a first water outlet for overflow discharge of the calibration medium, and a bottom portion of the first tank body having a first drain for discharge of the calibration medium; a second tank body, the first tank body being fixed on the second tank body, the second tank body having a second water inlet for receiving the calibration medium from the first water outlet, the first water outlet being located above the second water inlet so that an overflow connection is formed between the first tank body and the second tank body, and a second drain for discharge of the calibration medium at the bottom portion of the second tank body; wherein, when calibrating the minimum flow or the boundary flow, the calibration medium is only allowed to enter the first tank body for calibration, and when calibrating the normal flow, the calibration medium overflows into the second tank body through the first water outlet, and the calibration is performed together with the first tank body and the second tank body. The first drain outlet and the second drain outlet are both provided with valves to realize the opening or closing of each inlet and outlet. The inlet end of the water inlet pipe has a quick connector, which is used to connect to the water meter to be inspected. The quick connector and the user's tap are connected with a leather hose to pass water. The water inlet pipe has an upwardly protruding curved section, which is arranged in an N shape, forming two vertical pipelines arranged on the left and right and a horizontal pipeline connected between the two vertical pipelines. The flow regulating valve is located in the left vertical pipeline, and the flow indicating instrument is located in the right vertical pipeline, so that the flow indicating instrument is arranged vertically, and the calibration medium enters from the lower end of the flow indicating instrument to ensure that the flow indicating instrument is always full of water, thereby greatly improving the accuracy of the flow indicating instrument data. The flow regulating valve is downstream of the flow indicating instrument, and the flow indicating instrument and the water meter to be inspected are always in a full pipe state, and the start and end values ​​are always synchronized.

[0029] Among them, the laboratory's calibration device requires a complete water circulation system with numerous equipment, mainly including circulating water pumps, pressure-stabilizing tanks, water storage tanks, etc. The online calibration device uses the water pressure of the water supply network itself, without the need for water pumps and pressure-stabilizing tanks, and the calibration medium does not need to be recycled, so there is no need to store water in a water storage tank. The calibration medium can be discharged directly after the calibration is completed.

[0030] During the calibration of this online calibration device, the calibration medium must first pass through the first tank body, and then overflow into the second tank body after the first tank body reaches the predetermined liquid level. When calibrating the minimum flow Q1 or the boundary flow Q2, the first tank body is its standard container, and after the calibration is completed, the first tank body can be drained separately through the first drain port. When calibrating the commonly used flow Q3, the combination of the first tank body and the second tank body is its standard container, and after the calibration is completed, the first drain port and the second drain port are used to drain the water respectively. The combination of the first tank body and the second tank body realizes the calibration of different flow points. According to the ingenious combination of the first tank body and the second tank body, it is possible to flexibly choose to use only the first tank body for the calibration of the minimum flow or the boundary flow, or to connect the first tank body and the second tank body fluid to perform the calibration of the commonly used flow. This design not only improves the versatility and flexibility of the device, but also makes the calibration process more efficient and convenient.

[0031] like Figure 1-3 As shown, the first tank body includes a first small tank body and a first large tank body, the top of the first large tank body has a first annular slope, the first large tank body is fixedly connected to the first small tank body through the first annular slope and is in fluid communication, the first large tank body and the first small tank body are cylindrical structures, the diameter of the first large tank body is larger than that of the first small tank body, and the first large tank body gradually decreases to the first small tank body with a small diameter through the annularly inclined first annular slope. The second tank body includes a second small tank body and a second large tank body, the top of the second large tank body has a second annular slope, the second large tank body is fixedly connected to the second small tank body through the second annular slope and is in fluid communication, the second large tank body and the second small tank body are cylindrical structures, the diameter of the second large tank body is larger than that of the second small tank body, and the second large tank body gradually decreases to the second small tank body with a small diameter through the annularly inclined second annular slope. The bottom of the first large tank is fixed on the second annular inclined plane, and the fixing method includes but is not limited to welding, keying, riveting, etc., while the bottom of the first large tank is not connected to the second annular inclined plane, and the connection between the first tank and the second tank is achieved only through the pipeline of the first water outlet and the second water inlet, thereby ensuring the directional flow of the fluid. The first water inlet is located at the side of the first large tank, the first water outlet is located at the upper part of the first small tank, the first drain is located at the bottom of the first large tank, the second water inlet is located at the top of the second large tank, and the second drain is located at the bottom of the second large tank. Among them, the combined capacity of the first small tank and the first large tank is 10L-12L, the combined capacity of the second small tank and the second large tank is 90L-95L, the combination of the first small tank and the first large tank is used to calibrate the minimum flow or the boundary flow, and the combination of the first small tank, the first large tank, the second small tank and the second large tank is used to calibrate the commonly used flow. This design not only effectively reduces the overall volume of the entire calibration device, which is convenient for carrying, but also makes full use of the horizontal and vertical space through a reasonable combination design, making the equipment layout more compact.

[0032] like Figure 1-3As shown, the side of the first small tank and the side of the second small tank are both provided with a scale and a liquid level indicating glass tube, so that the operator can visually observe and read the volume of the medium to be tested inside the tank, which is convenient for accurate measurement. Among them, the first water outlet is higher than the scale of the first small tank by 10L, and lower than the scale of the second small tank by 100L. When the minimum flow rate or the boundary flow rate is verified, the operator can control the liquid level in the first tank by observing the scale of the scale of the first small tank. When the liquid level reaches the predetermined scale, the flow regulating valve can be closed, and the medium to be tested will not overflow and discharge through the first water outlet; when the common flow rate is verified, the operator can control the liquid level in the second tank by observing the scale of the scale of the second small tank. When the liquid level reaches the predetermined scale, the flow regulating valve can be closed. The reason for setting the scale and the liquid level indicating glass tube on the first small tank and the second small tank with smaller diameters is that the tank with a smaller diameter can improve the reading resolution of the scale, thereby achieving more accurate data reading. This design fully considers the needs of different calibration flow points and water consumption, ensuring that the required minimum resolution is met, thereby improving the accuracy and reliability of the overall calibration work.

[0033] like Figure 1-3 As shown, the top of the first small tank body has a first traceability port, and the top of the second small tank body has a second traceability port, and the first traceability port and the second traceability port are at the same height. When the standard container is traced back to the social public measurement standard or the national measurement benchmark, the first tank body is a traceability unit, and the combination of the first tank body and the second tank body is another traceability unit. This online calibration device can be traced back to the social public measurement standard or the national measurement benchmark through the first traceability port and the second traceability port, and the accuracy level is not less than 0.2. The traceability method is extremely convenient, and water can be introduced from the social public measurement standard to the first tank body through the first traceability port to trace the first tank body. When tracing the combination of the first tank body and the second tank body, water is introduced from the social public measurement standard into the first tank body and the second tank body through the second traceability port to complete the traceability of the combination of the first tank body and the second tank body.

[0034] like Figure 1-3 As shown, there is also a level on the top of the second small tank. By observing the level, the staff can promptly find out whether the device is placed horizontally and make adjustments to ensure the reliability of the calibration results. The level can be a universal level.

[0035] like Figure 1-3As shown, there is a drain pipe at the first drain outlet, and the drain pipe is equipped with a valve. The drain pipe is parallel to the second annular inclined surface, which makes the drainage process smoother and avoids poor drainage or water accumulation caused by angle problems. Since the bottom of the first large tank body is fixed on the second annular inclined surface, an inclined bottom surface is formed at the bottom of the first large tank body. This design allows the calibration medium to naturally flow along the inclined bottom surface to the lowest first drain outlet under the action of gravity. This not only improves the drainage efficiency, but also helps to ensure that the calibration medium can be completely drained, avoiding the possible impact of residual water on the next calibration.

[0036] like Figure 1 and 2 As shown, a thermometer is also provided on the water inlet pipe. The setting of the thermometer enables the test personnel to obtain the temperature information of the test medium in the water inlet pipe in real time. Because the test has regulations on water temperature, the test cannot be carried out when the water temperature is too high or too low.

[0037] like Figure 1-3 As shown, the bottom of the second tank body has multiple supports for support, which provide a stable support for the device, ensuring that the online calibration device can remain stable during the calibration process, and avoiding the accuracy of the calibration results being affected by shaking or tilting. In an embodiment not shown, multiple supports have adjustment components for adjusting the height. The height of each support is adjusted by observing the level gauge to make the online calibration device reach a horizontal state. The lifting method of the adjustment component can be spiral lifting, hydraulic lifting, air pressure lifting, etc. In an embodiment not shown, a pulley is also provided at the bottom of the support, so that the entire device has mobility and is more convenient to carry.

[0038] like Figure 1 and 2 As shown, the flow control valve is a ball valve. In addition to the ball valve, the flow control valve can also be a stop valve, a butterfly valve or a diaphragm valve, etc.

[0039] like Figure 1 and 2 As shown, the flow indicating instrument is a mechanical flow indicating instrument, an electromagnetic flow indicating instrument or an ultrasonic flow indicating instrument. The function of the flow indicating instrument is to display the instantaneous flow rate and to calibrate the selection of the flow point. It is preferably an electronic flow meter with a wide range ratio. Preferably, the flow indicating instrument is an ultrasonic flow indicating instrument. The ultrasonic flow indicating instrument has the characteristics of a wide range ratio and digital display, so that it has better applicability in practical applications.

[0040] like Figure 4 and Figure 5 As shown, the verification method of the utility model is as follows:

[0041] Work before calibration: With the help of the spirit level on the top of the second small tank, adjust the support to make the calibration device horizontal, close all valves, connect the calibration medium of the water meter to be tested to the water inlet pipe, allow the calibration medium to fill the flow display instrument and then flow through the flow regulating valve, fill the pipeline with the calibration medium, and exhaust the air in the pipeline.

[0042] Verification of commonly used flow rate Q3:

[0043] S1 Reading of the water meter under test: read the reading of the water meter under test and record it;

[0044] S2 opens the flow regulating valve: Open the flow regulating valve to make the indicated value of the flow indicating instrument reach the Q3 flow value required by the regulations;

[0045] S3 The test medium enters the first large tank, the first small tank, the second large tank and the second small tank in sequence: the test medium first enters the first large tank, fills the first large tank and then enters the first small tank. When the first large tank and the first small tank reach the predetermined liquid level, the test medium overflows and is discharged from the first water outlet, and enters the second large tank through the second water inlet. Then the liquid level of the liquid level indicator glass tube is observed through the scale of the second small tank.

[0046] S4: close the flow regulating valve and record the scale of the second small tank and the reading of the water meter to be inspected: when the predetermined scale is reached, close the flow regulating valve, read the scale on the scale of the second small tank as the standard value and record it, and read the reading of the water meter to be inspected again and record it;

[0047] S5 calculates the indication error of the common flow Q3: The indication error of the common flow Q3 is calculated by the formula, the specific formula is (water meter end value - water meter start value - standard value) / standard value * 100% to calculate the error of the water meter Q3 flow point;

[0048] S6 Open the drain port to drain the calibration medium: Open the valves of the first and second drain ports to drain the calibration medium and complete the error calibration of the commonly used flow rate Q3.

[0049] Verification of minimum flow Q1:

[0050] S1 Reading of the water meter under test: read the reading of the water meter under test and record it;

[0051] S2 opens the flow control valve: Open the flow control valve, and keep other valves closed, so that the indicated value of the flow indicating instrument reaches the Q1 flow value required by the regulations;

[0052] S3 The calibration medium enters the first large tank and the first small tank in sequence: the calibration medium first enters the first large tank, fills the first large tank, and then enters the first small tank. The liquid level of the liquid level indicator glass tube is observed through the scale of the first small tank. The height of the liquid level is lower than the first water outlet;

[0053] S4: close the flow regulating valve and record the scale of the first small tank and the reading of the water meter to be inspected: when the predetermined scale is reached, close the flow regulating valve, read the scale on the scale of the first small tank as the standard value and record it, and read the reading of the water meter to be inspected again and record it;

[0054] S5 calculates the indication error of the minimum flow Q1: the indication error of the minimum flow Q1 is calculated by the formula, the specific formula is (water meter end value - water meter start value - standard value) / standard value * 100% to calculate the error of the water meter Q1 flow point;

[0055] S6 opens the drain port to drain the calibration medium: Open the valve of the first drain port to drain the calibration medium and complete the error calibration of the minimum flow Q1.

[0056] Verification of boundary flow Q2:

[0057] S1 Reading of the water meter under test: read the reading of the water meter under test and record it;

[0058] S2 opens the flow control valve: Open the flow control valve, and keep other valves closed, so that the indicated value of the flow indicating instrument reaches the Q2 flow value required by the regulations;

[0059] S3 The calibration medium enters the first large tank and the first small tank in sequence: the calibration medium first enters the first large tank, fills the first large tank, and then enters the first small tank. The liquid level of the liquid level indicator glass tube is observed through the scale of the first small tank. The height of the liquid level is lower than the first water outlet;

[0060] S4: close the flow regulating valve and record the scale of the first small tank and the reading of the water meter to be inspected: when the predetermined scale is reached, close the flow regulating valve, read the scale on the scale of the first small tank as the standard value and record it, and read the reading of the water meter to be inspected again and record it;

[0061] S5 calculates the indication error of the boundary flow Q2: the indication error of the boundary flow Q2 is calculated by the formula, the specific formula is (water meter end value - water meter start value - standard value) / standard value * 100% to calculate the error of the water meter Q2 flow point;

[0062] S6 opens the drain port to drain the calibration medium: opens the valve of the first drain port to drain the calibration medium and completes the error calibration of the boundary flow Q2.

[0063] After completing the calibration of the three flow points of minimum flow Q1, boundary flow Q2 and common flow Q3, and separating the water inlet pipe from the water meter being tested, the online calibration of the water meter is completed.

[0064] In general, the utility model is used for the online calibration device of small-caliber water meters. When the water meter has a metering dispute and needs to be calibrated, or when the metering performance of the water meter needs to be spot-checked after a certain period of use, the online calibration device can be carried to the owner's home or the water meter for online calibration. There is no need to disassemble the water meter and send it to the laboratory for online calibration. The efficiency is high, the cost is low, and the calibration process is safe and convenient. The online calibration device of the utility model is directly connected to the water supply network. The water source of the water supply network is the real medium required for calibration. The total water consumption of the DN15-DN25 household water meter during the entire calibration process does not exceed 130 liters, which is less than 1 yuan in RMB. There is no need to take electricity from the owner's home, and the calibration process is safe and convenient. The online calibration device of the utility model has a first tracing port and a second tracing port. The first tracing port and the second tracing port can be traced back to the social public measurement standard or the national measurement benchmark. The accuracy level is not less than 0.2, and the tracing method is extremely convenient. Water can be introduced from the social public measurement standard to the first tank through the first tracing port to trace the first tank. When tracing the source of the combination of the first tank body and the second tank body, water is introduced from the social public measurement standard into the first tank body and the second tank body through the second tracing port to complete the tracing of the combination of the first tank body and the second tank body.

[0065] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An online calibration device for small-caliber water meters, characterized in that: include: A first tank body, wherein the side of the first tank body has a first water inlet for receiving a test medium, the first water inlet is connected to a water meter to be tested through a water inlet pipe, a flow indicator and a flow regulating valve are installed on the water inlet pipe, the upper part of the first tank body has a first water outlet for overflow discharge of the test medium, and the bottom of the first tank body has a first drain for discharge of the test medium; A second tank body, the first tank body is fixed on the second tank body, the second tank body has a second water inlet for receiving the calibration medium from the first water outlet, the first water outlet is located above the second water inlet, so that an overflow connection is formed between the first tank body and the second tank body, and the bottom of the second tank body has a second drain for discharging the calibration medium; Among them, when calibrating the minimum flow or the boundary flow, the calibration medium is only allowed to enter the first tank for calibration. When calibrating the normal flow, the calibration medium overflows into the second tank through the first water outlet, and the first tank and the second tank are used together for calibration.

2. The online calibration device for a small-caliber water meter according to claim 1 is characterized in that: The first tank body includes a first small tank body and a first large tank body, the top of the first large tank body has a first annular slope, the first large tank body is fixedly connected to the first small tank body through the first annular slope and fluidly communicated, the second tank body includes a second small tank body and a second large tank body, the top of the second large tank body has a second annular slope, the second large tank body is fixedly connected to the second small tank body through the second annular slope and fluidly communicated, the bottom of the first large tank body is fixed on the second annular slope, the first water inlet is located on the side of the first large tank body, the first water outlet is located on the upper part of the first small tank body, the first drain outlet is located at the bottom of the first large tank body, the second water inlet is located at the top of the second large tank body, and the second drain outlet is located at the bottom of the second large tank body.

3. The online calibration device for a small-caliber water meter according to claim 2 is characterized in that: The side of the first small tank body and the side of the second small tank body are both provided with a scale and a liquid level indicating glass tube.

4. The online calibration device for a small-caliber water meter according to claim 2, characterized in that: The top of the first small can body is provided with a first traceability port, and the top of the second small can body is provided with a second traceability port, and the heights of the first traceability port and the second traceability port are the same.

5. The online calibration device for a small-caliber water meter according to claim 2, characterized in that: The second small tank also has a level on the top.

6. The online calibration device for a small-caliber water meter according to claim 2, characterized in that: A drain pipe is provided at the first drain outlet, a valve is installed on the drain pipe, and the drain pipe is parallel to the second annular inclined surface.

7. The online calibration device for a small-caliber water meter according to claim 1, characterized in that: A thermometer is also provided on the water inlet pipe.

8. The online calibration device for a small-caliber water meter according to claim 1, characterized in that: The bottom of the second tank body has a plurality of supports for support.

9. The online calibration device for a small-caliber water meter according to claim 1, characterized in that: The flow regulating valve is a ball valve, a stop valve, a butterfly valve or a diaphragm valve.

10. The online calibration device for a small-caliber water meter according to claim 1, characterized in that: The flow indicating instrument is a mechanical flow indicating instrument, an electromagnetic flow indicating instrument or an ultrasonic flow indicating instrument.

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