Calibration cleaning device of flowmeter

Abstract

The calibration cleaning device comprises a first pipe, a second pipe, a machine body, a liquid calibration cleaning mechanism and a gas calibration cleaning mechanism, wherein the liquid calibration cleaning mechanism and the gas calibration cleaning mechanism are both arranged on the machine body. The liquid calibration cleaning mechanism comprises a liquid storage device, a first pipeline with the first end communicating with the liquid storage device, a liquid receiving device and a weighing device for supporting the liquid receiving device. The gas calibration cleaning mechanism comprises a gas source, a second pipeline with the first end communicated with the gas source, and a standard gas flowmeter arranged on the second pipeline. Two ends of the first pipe can be communicated with the second end of the first pipeline and an inlet of the liquid flowmeter, and two ends of the second pipe can be communicated with an outlet of the liquid flowmeter and the liquid receiver; or the two ends of the first pipe can be communicated with the second end of the second pipeline and the inlet of the gas flowmeter, and the second pipe can be communicated with the outlet of the gas flowmeter. By switching the communicating structure of the first pipe and the second pipe, switching of calibration and cleaning of the liquid flowmeter and the gas flowmeter can be conveniently achieved.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, and in particular to a calibration and cleaning device for flow meters. Background Technology

[0002] In the tobacco production process of cigarette factories, liquid flow meters are used to measure the flow rate of liquid raw materials such as flavorings and fragrances with high precision, and gas flow meters are used to monitor the flow rate of incoming steam to balance the moisture and temperature of the tobacco. Therefore, the metering accuracy of liquid and gas flow meters is of great significance to the quality of tobacco production.

[0003] To ensure the measurement accuracy of liquid and gas flow meters, both types of flow meters are calibrated using a calibration device before use to test their measurement accuracy. They are also periodically cleaned using a cleaning device to remove impurities that accumulate over time. Because liquid flow meters require liquid to pass through for calibration and cleaning, while gas flow meters require gas, different calibration and cleaning equipment is used for each type. Therefore, when calibration and cleaning are required for either type of flow meter, different calibration and cleaning equipment must be used accordingly, which affects the efficiency of calibration and cleaning and is time-consuming and labor-intensive. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a calibration and cleaning device for flow meters, which solves the technical problem that when two flow meters are equipped with different calibration and cleaning equipment, different calibration and cleaning equipment must be replaced accordingly when calibrating and cleaning the two flow meters, which affects the calibration and cleaning efficiency and is time-consuming and labor-intensive.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, this utility model provides a calibration and cleaning device for a flow meter, including a first tube, a second tube, a body, and a liquid calibration and cleaning mechanism and a gas calibration and cleaning mechanism, both of which are disposed on the body.

[0009] The liquid calibration and cleaning mechanism includes a liquid reservoir, a first pipeline with one end connected to the liquid reservoir, a liquid receiving device, and a weighing device supporting the liquid receiving device; the gas calibration and cleaning mechanism includes a gas source, a second pipeline with one end connected to the gas source, and a standard gas flow meter installed on the second pipeline.

[0010] The two ends of the first pipe can connect to the second end of the first pipeline and the inlet of the liquid flow meter, and the two ends of the second pipe can connect to the outlet of the liquid flow meter and the liquid receiving device; or,

[0011] The two ends of the first pipe can be connected to the second end of the second pipe and the inlet of the gas flow meter, and the second pipe can be connected to the outlet of the gas flow meter.

[0012] According to this utility model, it also includes a controller;

[0013] The gas calibration and cleaning mechanism also includes a differential pressure sensor and a temperature and humidity meter;

[0014] The differential pressure sensor and the temperature and humidity meter are both installed on the second pipeline. The differential pressure sensor is used to obtain the gas pressure difference in the second pipeline, and the temperature and humidity meter is used to obtain the temperature and humidity in the second pipeline. The controller is connected to the differential pressure sensor and the temperature and humidity meter and is used to obtain the gas flow rate through the second pipeline.

[0015] According to this utility model, a first valve is also provided at the second end of the second pipeline.

[0016] According to this utility model, the liquid calibration and cleaning mechanism further includes a standard liquid flow meter installed on the first pipeline.

[0017] According to this utility model, the liquid receiving device is located below the liquid storage device, the liquid storage device is provided with a drain pipe for draining liquid to the liquid receiving device, and a second valve is provided on the drain pipe.

[0018] According to this utility model, the liquid calibration and cleaning mechanism further includes a pump disposed on the first pipeline and a third valve disposed at the second end of the first pipeline.

[0019] According to this utility model, the liquid storage device is a tank, and the liquid receiving device is a barrel.

[0020] According to this utility model, the machine body is a cavity frame structure, and the liquid calibration and cleaning mechanism and the gas calibration and cleaning mechanism are both arranged in the cavity of the machine body, and the liquid calibration and cleaning mechanism and the gas calibration and cleaning mechanism are arranged vertically.

[0021] According to this utility model, the machine body is provided with a hanging component, and both the first tube and the second tube can be hung on the hanging component;

[0022] The bottom of the machine body is equipped with wheels.

[0023] According to this utility model, the machine body is also provided with a power supply, a control panel and a control switch;

[0024] The controller is connected to the control panel, the control switch, the weighing device, the differential pressure sensor, the thermometer and hygrometer, and the air source;

[0025] The power supply is connected to the control switch, the control panel, the controller, and the gas source;

[0026] The control panel is used to display the liquid flow rate through the first pipeline and the gas flow rate through the second pipeline.

[0027] (III) Beneficial Effects

[0028] The beneficial effects of this utility model are as follows: The calibration and cleaning device for the flow meter of this utility model integrates both the liquid calibration and cleaning mechanism and the gas calibration and cleaning mechanism into the machine body to form a complete unit. This calibration and cleaning device for the flow meter can conveniently switch between calibration and cleaning of liquid flow meters and gas flow meters by changing the structure connected to the first and second pipes, making operation convenient and improving operational efficiency. At the same time, both the liquid calibration and cleaning mechanism and the gas calibration and cleaning mechanism integrate calibration and cleaning functions, enabling selective calibration and cleaning of the flow meter. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of the calibration and cleaning device for the flow meter of this utility model;

[0030] Figure 2 for Figure 1 The main view;

[0031] Figure 3 for Figure 1 Rear view;

[0032] Figure 4 A three-dimensional schematic diagram of the liquid calibration and cleaning mechanism;

[0033] Figure 5 This is a three-dimensional schematic diagram of a gas calibration and cleaning mechanism.

[0034] [Explanation of Labels in the Attached Image]

[0035] 1: First tube;

[0036] 2: Second tube;

[0037] 3: Body; 31: Mounting component; 32: Wheels;

[0038] 4: Liquid calibration and cleaning mechanism; 41: Liquid reservoir; 42: First pipeline; 43: Liquid receiving device; 44: Weighing device; 45: Standard liquid flow meter; 46: Drain pipeline; 47: Second valve; 48: Pump; 49: Third valve;

[0039] 5: Gas calibration and cleaning mechanism; 51: Gas source; 52: Second pipeline; 53: Standard gas flow meter; 54: Differential pressure sensor; 55: Temperature and humidity meter; 56: First valve;

[0040] 61: Power supply; 62: Control panel; 63: Control switch; 64: Controller. Detailed Implementation

[0041] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper" and "lower" are used interchangeably with... Figure 1 The orientation is used as a reference.

[0042] See Figure 1-5 The present invention provides a calibration and cleaning device for a flow meter, comprising a first tube 1, a second tube 2, a body 3, and a liquid calibration and cleaning mechanism 4 and a gas calibration and cleaning mechanism 5, both mounted on the body 3.

[0043] The liquid calibration and cleaning mechanism 4 includes a liquid reservoir 41, a first pipe 42 with its first end connected to the liquid reservoir 41, a liquid receiver 43, and a weighing device 44 supporting the liquid receiver 43. The gas calibration and cleaning mechanism 5 includes a gas source 51, a second pipe 52 with its first end connected to the gas source 51, and a standard gas flow meter 53 installed on the second pipe 52.

[0044] The two ends of the first pipe 1 can be connected to the second end of the first pipe 42 and the inlet of the liquid flow meter, and the second pipe 2 can be connected to the outlet of the liquid flow meter, so that the liquid reservoir 41, the first pipe 42, the liquid flow meter, the second pipe 2 and the liquid receiver 43 form a liquid calibration cleaning path through which the liquid flows in sequence; or,

[0045] The two ends of the first pipe 1 can be connected to the second end of the second pipe 52 and the inlet of the gas flow meter, and the second pipe 2 can be connected to the outlet of the gas flow meter, so that the gas source 51, the second pipe 52, the standard gas flow meter 53, the gas flow meter and the second pipe 2 form a gas calibration and cleaning path through which the gas flows in sequence.

[0046] In this embodiment, both the liquid calibration and cleaning mechanism 4 and the gas calibration and cleaning mechanism 5 are integrated onto the body 3 to form a complete machine. When the liquid flow meter needs to be calibrated, the first pipe 1 and the second pipe 2 can be connected to the liquid calibration and cleaning mechanism 4 and the liquid flow meter to form a liquid calibration and cleaning path through which the liquid flows sequentially. By combining the calibration time and the weight of the liquid discharged into the liquid receiving container 43 within the calibration time as measured by the weighing device 44, the liquid flow rate through the first pipe 42 can be obtained. By comparing this flow rate value with the reading of the liquid flow meter, it can be determined whether the accuracy of the liquid flow meter meets the standard, thus achieving the calibration of the liquid flow meter. When the liquid flow meter needs to be cleaned, impurities deposited inside the liquid flow meter can be removed by flushing with the liquid flowing through the liquid calibration and cleaning path. When calibrating a gas flow meter, the first pipe 1 and the second pipe 2 can be connected to the gas calibration and cleaning mechanism 5 and the gas flow meter to be tested, forming a gas calibration and cleaning path through which the gas flows sequentially. By comparing the readings of the standard gas flow meter 53 and the gas flow meter to be tested, it can be determined whether the accuracy of the gas flow meter meets the standard, thus achieving the calibration of the gas flow meter. When cleaning the gas flow meter is required, impurities deposited inside the gas flow meter can be removed by flushing with gas flowing through the gas calibration and cleaning path.

[0047] Therefore, the calibration and cleaning device of this flowmeter can conveniently switch between calibrating and cleaning liquid flowmeters and gas flowmeters by changing the structure connecting the first pipe 1 and the second pipe 2, which is convenient and improves operational efficiency. Simultaneously, both the liquid calibration and cleaning mechanism 4 and the gas calibration and cleaning mechanism 5 integrate calibration and cleaning functions, enabling selective calibration and cleaning of the flowmeter. Furthermore, by combining the calibration time with the weight of the liquid discharged into the receiving container 43 within the calibration time as measured by the weighing device 44, the flow rate of the liquid flowing through the first pipe 42 can be obtained, ensuring the accuracy of the obtained liquid weight and thus the accuracy of the obtained liquid flow rate through the first pipe 42.

[0048] It should be noted that when calibrating a liquid flow meter: if the liquid flow rate through the first pipe 42 matches the reading of the liquid flow meter, the accuracy of the liquid flow meter is considered to meet the standard; if the two values ​​do not match, the accuracy of the liquid flow meter is considered to be substandard. Similarly, when calibrating a gas flow meter: if the readings of the standard gas flow meter 53 and the gas flow meter to be measured match, the accuracy of the gas flow meter is considered to meet the standard; if the two values ​​do not match, the accuracy of the gas flow meter is considered to be substandard.

[0049] It should be noted that the flow rate through the first pipe 42 is calculated as follows: the weight of the liquid discharged into the liquid receiving container 43 as measured by the weighing device 44 within the calibration time is divided by the calibration time to obtain the flow rate through the first pipe 42, and this flow rate is the mass flow rate. This calculation method uses the conventional formula for calculating mass flow rate.

[0050] Specifically, the second end of the first pipeline 42, the inlet and outlet of the liquid flow meter, and the inlet and outlet of the gas flow meter are all provided with connectors that can connect to the first pipeline 1 or the second pipeline 2.

[0051] Furthermore, the liquid calibration and cleaning mechanism 4 also includes a pump 48 installed on the first pipeline 42 and a third valve 49 installed at the second end of the first pipeline 42.

[0052] When the liquid flow meter needs to be calibrated, a certain amount of liquid is first injected into the liquid reservoir 41, and the first pipe 1 and the second pipe 2 are connected to the liquid calibration and cleaning mechanism 4 and the liquid flow meter to form a liquid calibration and cleaning path. Then, the third valve 49 and the pump 48 are opened in sequence so that the liquid in the liquid reservoir 41 flows along the liquid calibration and cleaning path.

[0053] Furthermore, the liquid calibration and cleaning mechanism 4 also includes a standard liquid flow meter 45 installed on the first pipeline 42. The liquid reservoir 41, the first pipeline 42, the standard liquid flow meter 45, the liquid flow meter, the second pipeline 2, and the liquid receiver 43 form a liquid calibration and cleaning path through which the liquid flows in sequence.

[0054] When calibrating a liquid flow meter, the flow rate of the liquid flowing through the first pipeline 42, the reading of the standard liquid flow meter 45, and the reading of the liquid flow meter are compared to further improve the calibration accuracy of the liquid flow meter.

[0055] It should be noted that when the three values ​​are consistent, the accuracy of the liquid flow meter can be determined to meet the standard; when the liquid flow rate through the first pipeline 42 is inconsistent with the reading of the standard liquid flow meter 45, the readings of the standard liquid flow meter 45 and the liquid flow meter are compared. If they are consistent, the accuracy of the liquid flow meter is determined to meet the standard; otherwise, it does not meet the standard.

[0056] Furthermore, the liquid receiving device 43 is located below the liquid storage device 41, and the liquid storage device 41 is provided with a drain pipe 46 for draining liquid to the liquid receiving device 43, and a second valve 47 is provided on the drain pipe 46.

[0057] After the liquid flow meter has completed its measurement, the second valve 47 can be opened to discharge excess liquid in the reservoir 41 into the receiving container 43 through the drain pipe 46.

[0058] Optionally, the liquid storage container 41 is a tank and the liquid receiving container 43 is a barrel, so as to accommodate and receive liquid.

[0059] Optionally, the liquid stored in the reservoir 41 is water, so that the liquid flow meter can be calibrated and cleaned with water to avoid contaminating the liquid flow meter.

[0060] Furthermore, the gas calibration and cleaning mechanism 5 also includes a differential pressure sensor 54, a temperature and humidity meter 55, and a controller 64;

[0061] Both the differential pressure sensor 54 and the temperature and humidity meter 55 are installed on the second pipeline 52. The differential pressure sensor 54 is used to obtain the gas pressure difference in the second pipeline 52, and the temperature and humidity meter 55 is used to obtain the gas temperature and humidity in the second pipeline 52. The controller 64 is connected to the differential pressure sensor 54 and the temperature and humidity meter 55 and is used to obtain the gas flow rate through the second pipeline 52. This allows the gas source 51, the second pipeline 52, the standard gas flow meter 53, the gas flow meter, and the second pipeline 2 to form a gas calibration and cleaning path through which the gas flows sequentially.

[0062] When calibrating the gas flow meter, the gas flow rate through the second pipeline 52, the reading of the standard gas flow meter 53, and the reading of the gas flow meter to be measured are compared to further improve the calibration accuracy of the gas flow meter.

[0063] When the three values ​​are consistent, the gas flow meter is considered to meet the accuracy standard. When the gas flow rate through the second pipeline 52 is inconsistent with the reading of the standard gas flow meter 53, the readings of the standard gas flow meter 53 and the gas flow meter are compared. If they are consistent, the gas flow meter is considered to meet the accuracy standard; otherwise, it is not.

[0064] It should be noted that the calculation method for the gas flow rate through the second pipeline 52 is as follows:

[0065] S1. Calculate the gas density ρ1 in the second pipe 52:

[0066]

[0067] In the formula, B is the standard atmospheric pressure, T1 is the gas temperature, and P... q This refers to the humidity of the gas.

[0068] S2. Calculate the gas velocity v1 in the second pipe 52:

[0069]

[0070] In the formula, ΔP1 is the gas pressure difference.

[0071] S3. Calculate the volumetric flow rate V1 of the gas in the second pipeline 52:

[0072]

[0073] In the formula, D is the inner diameter of the second pipe 52.

[0074] It should be noted that the above technical method is a conventional formula for calculating volumetric flow rate.

[0075] Furthermore, a first valve 56 is also provided at the second end of the second pipeline 52. When the gas flow meter needs to be calibrated and cleaned, the gas source 51 and the first valve 56 are opened so that the gas discharged from the gas source 51 flows along the gas calibration and cleaning path.

[0076] Optionally, the air source 51 is an air compressor.

[0077] Furthermore, the body 3 has a hollow frame structure, and the liquid calibration and cleaning mechanism 4 and the gas calibration and cleaning mechanism 5 are both located inside the cavity of the body 3. The liquid calibration and cleaning mechanism 4 and the gas calibration and cleaning mechanism 5 are arranged vertically to reduce the overall volume of the calibration and cleaning device of this flowmeter.

[0078] Preferably, the bottom of the body 3 is provided with wheels 32 to facilitate moving the entire calibration and cleaning device of this flowmeter to the location of the liquid flowmeter and gas flowmeter to be measured and cleaned. More preferably, the wheels 32 are casters to facilitate movement.

[0079] Preferably, a mounting bracket 31 is provided on the body 3, and both the first pipe 1 and the second pipe 2 can be hung on the mounting bracket 31 to facilitate storage and further improve the integration of the calibration and cleaning device of this flowmeter. More preferably, the mounting bracket 31 is a horizontal rod fixed on the body 3.

[0080] Preferably, both the first tube 1 and the second tube 2 are flexible plastic tubes that can be bent and suspended on the hanger 31.

[0081] Furthermore, the body 3 is also equipped with a power supply 61, a control panel 62, a control switch 63, and a controller 64.

[0082] The controller 64 is connected to the control panel 62, control switch 63, weighing device 44, differential pressure sensor 54, thermometer and hygrometer 55, and air source 51. The power supply 61 is connected to the control switch 63, controller 64, control panel 62, and air source 51, and supplies power to each mechanism.

[0083] The control switch 63 can control the opening and closing of the controller 64. The controller 64 is used to control the opening and closing of the weighing device 44, receive the liquid weight value transmitted by the weighing device 44 into the liquid receiving device 43, and calculate the liquid flow rate through the first pipeline 42. It is also used to control the opening and closing of the gas source 51, differential pressure sensor 54, and thermo-hygrometer 55, receive the gas temperature and humidity in the second pipeline 52 transmitted by the differential pressure sensor 54 and thermo-hygrometer 55, and calculate the gas flow rate through the second pipeline 52. It is also used to transmit the liquid flow rate through the first pipeline 42 and the gas flow rate through the second pipeline 52 to the control panel 62 for display. This facilitates the comparison of the liquid flow rate through the first pipeline 42, the reading of the standard gas flow meter 53, and the reading of the gas flow meter to be measured. It also facilitates the comparison of the liquid flow rate through the first pipeline 42, the reading of the standard liquid flow meter 45, and the reading of the liquid flow meter.

[0084] Furthermore, the working principle of this liquid calibration and cleaning mechanism 4 is as follows:

[0085] When calibrating a liquid flow meter, first fill the reservoir 41 with water, then push the device to the position of the liquid flow meter using the wheel 32. Next, turn on the power supply 61 and the control switch 63. Remove the first pipe 1 and the second pipe 2. Connect the two ends of the first pipe 1 to the third valve 49 and the inlet connector of the liquid flow meter to be tested, respectively. Connect one end of the second pipe 2 to the outlet connector of the liquid flow meter to be tested, and insert the other end into the receiving container 43. Turn on the third valve 49 and the pump 48 in sequence to allow water to flow through the liquid calibration and cleaning path. After running for a period of time, stop the pump 48. Compare the liquid flow rate through the first pipe 42 displayed on the control panel 62 with the reading of the standard liquid flow meter 45 and the reading of the liquid flow meter to determine the calibration status of the liquid flow meter. Repeat the above steps multiple times when cleaning the liquid flow meter to be tested is required.

[0086] Furthermore, the working principle of this gas calibration and cleaning mechanism 5 is as follows:

[0087] When calibrating a gas flow meter, first push the device to the position of the gas flow meter using the wheel 32. Then, turn on the power supply 61 and turn on the control switch 63. Remove the first pipe 1 and the second pipe 2. Connect the two ends of the first pipe 1 to the first valve 56 and the inlet connector of the liquid flow meter, respectively. Connect one end of the second pipe 2 to the outlet connector of the liquid flow meter, leaving the other end unconnected. Then, start the gas source 51 and run it for a period of time before stopping the gas source 51. Finally, determine the calibration status of the gas flow meter by observing the gas flow rate through the second pipe 52 displayed on the control panel 62. Repeat the above steps multiple times when cleaning the gas flow meter to be tested is required.

[0088] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0089] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0090] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0091] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A calibration and cleaning device for a flow meter, characterized in that, It includes a first tube (1), a second tube (2), a body (3), and a liquid calibration and cleaning mechanism (4) and a gas calibration and cleaning mechanism (5) both mounted on the body (3); The liquid calibration and cleaning mechanism (4) includes a liquid reservoir (41), a first pipeline (42) with its first end connected to the liquid reservoir (41), a liquid receiver (43), and a weighing device (44) supporting the liquid receiver (43); the gas calibration and cleaning mechanism (5) includes a gas source (51), a second pipeline (52) with its first end connected to the gas source (51), and a standard gas flow meter (53) installed on the second pipeline (52); The two ends of the first pipe (1) can connect to the second end of the first pipe (42) and the inlet of the liquid flow meter, and the two ends of the second pipe (2) can connect to the outlet of the liquid flow meter and the liquid receiving device (43); or, The two ends of the first pipe (1) can be connected to the second end of the second pipe (52) and the inlet of the gas flow meter, and the second pipe (2) can be connected to the outlet of the gas flow meter.

2. The calibration and cleaning device for the flow meter as described in claim 1, characterized in that, It also includes the controller (64); The gas calibration and cleaning mechanism (5) also includes a differential pressure sensor (54) and a thermometer and hygrometer (55); The differential pressure sensor (54) and the thermo-hygrometer (55) are both installed on the second pipeline (52). The differential pressure sensor (54) is used to obtain the gas pressure difference in the second pipeline (52), and the thermo-hygrometer (55) is used to obtain the temperature and humidity in the second pipeline (52). The controller (64) is connected to the differential pressure sensor (54) and the thermo-hygrometer (55) and is used to obtain the gas flow rate through the second pipeline (52).

3. The calibration and cleaning device for the flow meter as described in claim 2, characterized in that, The second end of the second pipeline (52) is also provided with a first valve (56).

4. The calibration and cleaning device for the flow meter as described in claim 1, characterized in that, The liquid calibration and cleaning mechanism (4) also includes a standard liquid flow meter (45) installed on the first pipeline (42).

5. The calibration and cleaning device for the flow meter as described in claim 3, characterized in that, The liquid receiving device (43) is located below the liquid storage device (41). The liquid storage device (41) is provided with a drain pipe (46) for draining liquid to the liquid receiving device (43). A second valve (47) is provided on the drain pipe (46).

6. The calibration and cleaning device for the flow meter as described in claim 1, characterized in that, The liquid calibration and cleaning mechanism (4) further includes a pump (48) installed on the first pipeline (42) and a third valve (49) installed at the second end of the first pipeline (42).

7. The calibration and cleaning device for the flow meter as described in claim 1, characterized in that, The liquid storage device (41) is a tank, and the liquid receiving device (43) is a barrel.

8. The calibration and cleaning device for the flow meter as described in claim 1, characterized in that, The body (3) is a cavity frame structure. The liquid calibration and cleaning mechanism (4) and the gas calibration and cleaning mechanism (5) are both located in the cavity of the body (3) and are arranged vertically.

9. The calibration and cleaning device for the flow meter as described in claim 1, characterized in that, The body (3) is provided with a hanging part (31), and the first tube (1) and the second tube (2) can both be hung on the hanging part (31); Wheels (32) are provided at the bottom of the body (3).

10. The calibration and cleaning device for the flow meter as described in claim 2, characterized in that, The body (3) is also equipped with a power supply (61), a control panel (62) and a control switch (63); The controller (64) is connected to the control panel (62), the control switch (63), the weighing device (44), the differential pressure sensor (54), the thermometer and hygrometer (55), and the air source (51); The power supply (61) is connected to the control switch (63), the control panel (62), the controller (64), and the gas source (51); The control panel (62) is used to display the liquid flow rate through the first pipeline (42) and the gas flow rate through the second pipeline (52).

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