A device for calibrating a float flowmeter

Abstract

The utility model discloses a device for calibrating float flowmeter, including air compressor, air receiver, support connecting device, first sampling device, second sampling device and thermal type gas mass flowmeter, air compressor is connected with air receiver, air receiver is connected with the gas guide pipeline of support connecting device, and the gas regulator of float flowmeter is connected with the gas guide pipeline of support connecting device, and the air inlet is connected with the gas guide pipeline of support connecting device, and first sampling device is connected in the front of gas regulator air inlet pipeline, and first sampling device is used for collecting the temperature and / or pressure data of gas, the air inlet of thermal type gas mass flowmeter is connected with the gas outlet of gas regulator, and the gas outlet of thermal type gas mass flowmeter is communicated outside environment, and second sampling device is connected in the front of thermal type gas mass flowmeter air inlet pipeline, and is used for collecting the temperature and / or pressure data of gas, the utility model discloses can realize the measurement calibration of float flowmeter under the condition of not separating float flowmeter and gas regulator.

Description

Technical Field

[0001] This utility model belongs to the field of float flowmeter calibration technology, specifically relating to a device for calibrating float flowmeters. Background Technology

[0002] In gas shielded welding, the float flowmeter equipped with the gas regulator connected to the gas cylinder has a small diameter, and its scale display is based on non-standard conditions. Typically, the gas medium used by the float flowmeter is argon or carbon dioxide. The float flowmeter and gas regulator are connected by a threaded adhesive joint, which is not only inconvenient to disassemble but also prone to damaging the original seal after disassembly. Existing calibration methods for float flowmeters mainly include volumetric methods and standard meter methods. Traditional calibration, whether using the volumetric method or the standard meter method, requires first removing the float flowmeter from the gas regulator and then connecting it to a standard device for calibration. Due to the special connection method between the float flowmeter and the gas regulator, the disassembly process is cumbersome and may damage the sealed connection between the float flowmeter and the gas regulator. Currently, there is a need to develop a device for calibrating float flowmeters that can achieve measurement and calibration of the float flowmeter without separating it from the gas regulator. Utility Model Content

[0003] To address the aforementioned problems in the prior art, this utility model provides a device for calibrating a float flowmeter, which can achieve measurement and calibration of the float flowmeter without separating the float flowmeter from the gas regulator.

[0004] The present invention adopts the following technical solution: An apparatus for calibrating a float-type flowmeter includes an air compressor, an air tank, a support connection device, a first sampling device, a second sampling device, and a thermal gas mass flowmeter. The air compressor is connected to the air tank. The air tank is connected to the air supply line of the support connection device. A gas regulator with a float-type flowmeter has its inlet connected to the air supply line of the support connection device. The first sampling device is connected upstream of the gas regulator's inlet line and is used to collect temperature and / or pressure data of the gas. The inlet of the thermal gas mass flowmeter is connected to the outlet of the gas regulator, and the outlet of the thermal gas mass flowmeter is open to the external environment. The second sampling device is connected upstream of the thermal gas mass flowmeter's inlet line and is used to collect temperature and / or pressure data of the gas.

[0005] Furthermore, the supporting connection device includes a first connector, a support column, and a first valve adjusting component; the first connector is disposed on the support column and communicates with the internal pipeline of the support column; the gas outlet of the gas storage tank can be connected to the first connector through a first connecting pipe; the first valve adjusting component is adjustablely disposed on the support column and is used to control the on / off state of the internal pipeline of the support column.

[0006] Furthermore, the support connection device also includes a pressure regulator, the air inlet of which can be connected to the air outlet of the internal pipeline of the support column; the first air outlet of the pressure regulator is connected to the first sampling device; and the second air outlet of the pressure regulator is connected to a gas regulator with a float flow meter.

[0007] Furthermore, the pressure regulator is equipped with a safety valve, which is used to relieve pressure when the gas pressure inside the pressure regulator rises abnormally.

[0008] Furthermore, the pressure regulator has an adjustment knob, which is used to adjust the position of the internal valve assembly of the pressure regulator to adjust the gas output pressure at the outlet of the pressure regulator.

[0009] Furthermore, the air inlet of the pressure regulator is connected to a second connecting pipe; the air outlet of the internal pipeline of the support column is connected to a third connecting pipe; the second connecting pipe and the third connecting pipe are detachably connected.

[0010] Furthermore, the support connection device also includes a support base; the support column is disposed on the support base.

[0011] Furthermore, the first sampling device includes a first base, a first digital thermometer, and a first digital pressure gauge; the first digital thermometer and the first digital pressure gauge are respectively disposed on the first base; the first base is used to connect to the front position of the gas regulator inlet pipe; the first digital thermometer is used to measure the gas temperature in the pipe inside the first base; the first digital pressure gauge is used to measure the gas pressure in the pipe inside the first base.

[0012] Furthermore, the second sampling device includes a second base, a second digital thermometer, and a second digital pressure gauge; the second digital thermometer and the second digital pressure gauge are respectively disposed on the second base; the second base is used to connect to the outlet of the gas regulator; the second digital thermometer is used to measure the gas temperature in the internal pipeline of the second base; the second digital pressure gauge is used to measure the gas pressure in the internal pipeline of the second base.

[0013] Furthermore, an apparatus for calibrating a float flowmeter further includes a tee connector having a first connection port, a second connection port, and a third connection port. The first connection port is connected to the outlet of a gas regulator via a fourth connecting pipe; the second connection port is connected to the inlet of a second base; and the third connection port is connected to the inlet of a thermal gas mass flowmeter via a fifth connecting pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention relates to a device for calibrating a float flowmeter. An air compressor generates compressed air, and an air tank stores the gas and ensures a stable gas output. The gas from the air tank flows into a guide pipe of a supporting connecting device. The guide pipe then transports the gas along the pipeline. A first sampling device can detect the temperature and / or pressure of the gas at a position in front of the gas regulator, thereby obtaining the temperature and / or pressure data of the gas before the gas regulator's inlet. This data is then used to calibrate the float flowmeter on the gas regulator using a pre-set formula. The guide pipe of the supporting connecting device transports the gas along the pipeline... In the pipeline transportation process, after the gas flows through the gas regulator equipped with a float flowmeter, it continues to be transported along the pipeline. Then, the second acquisition device can detect the temperature and / or pressure of the gas at a position in front of the thermal gas mass flowmeter, thereby obtaining the temperature and / or pressure data of the gas before the inlet of the thermal gas mass flowmeter. This data is then used to calibrate the float flowmeter on the gas regulator by substituting it into the set formula. Here, the float flowmeter on the gas regulator is the flowmeter to be calibrated, while the thermal gas mass flowmeter is the standard flowmeter used to measure the actual flow rate of the gas, which is beneficial for calibrating the float flowmeter on the gas regulator.

[0015] This invention relates to a device for calibrating a float flowmeter, which enables the measurement and calibration of the float flowmeter without separating the float flowmeter from the gas regulator. Attached Figure Description

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a connection diagram of the air compressor and the air tank (the air compressor and air tank are simplified). Figure 2 This is a connection diagram of the supporting connection device, the gas regulator with float flow meter, the first sampling device, the second sampling device, and the thermal gas mass flow meter (where the safety valve is shown in a simplified diagram). Figure 3 yes Figure 2 A three-dimensional diagram from another perspective; Figure 4This is a three-dimensional schematic diagram of the first sampling device; Figure 5 This is a three-dimensional schematic diagram of the first base; Figure 6 It is a three-dimensional schematic diagram of a gas regulator, pressure gauge, and float flow meter; Figure 7 This is a three-dimensional schematic diagram of the second data acquisition device; Figure 8 This is a three-dimensional schematic diagram of the second base; Figure 9 This is a simplified elevation view of a thermal gas mass flow meter.

[0017] Figure label: 1-Air compressor; 2-Air tank; 3-Supporting connection device; 4-First sampling device; 5-Second sampling device; 6-Thermal gas mass flow meter; 7-Float flow meter; 8-Gas regulator; 9-First gas delivery pipe; 10-First connector; 11-Support; 12-First valve adjusting component; 13-First connecting pipe; 14-Pressure regulator; 15-Safety valve; 16-Adjusting knob; 17-Second connecting pipe; 18-Third connecting pipe; 19-First nut; 20-Seventh connecting pipe; 21-Eighth connecting pipe; 22-Second nut; 23-Support base; 24-Sixth connecting pipe; 25-First base; 26-First digital thermometer; 27-First digital pressure gauge; 28-First internal threaded hole; 29-Second internal threaded hole; 30-Air inlet of the internal pipeline of the first base; 31-Second base; 32-Second digital thermometer; 33-Second digital pressure gauge; 34-Third internal threaded hole; 35-Fourth internal threaded hole; 36-Tee connector; 37-Fourth connecting pipe; 38-Fifth connecting pipe; 39-Pressure gauge; 40-Gas regulator outlet; 41 - Inlet of the thermal gas mass flow meter; 42 - Outlet of the thermal gas mass flow meter. Detailed Implementation

[0018] The following will provide a clear and complete description of the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0019] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0020] Reference Figures 1 to 9 An apparatus for calibrating a float-type flowmeter includes an air compressor 1, an air tank 2, a support connection device 3, a first sampling device 4, a second sampling device 5, and a thermal gas mass flowmeter 6. The air compressor 1 is connected to the air tank 2. The air tank 2 is connected to the air guide pipe of the support connection device 3. A gas regulator 8 with a float-type flowmeter 7 has its inlet connected to the air guide pipe of the support connection device 3. The first sampling device 4 is connected in front of the inlet pipe of the gas regulator 8 and is used to collect temperature and / or pressure data of the gas. The inlet 41 of the thermal gas mass flowmeter is connected to the outlet of the gas regulator 8, and the outlet 42 of the thermal gas mass flowmeter is connected to the external environment. The second sampling device 5 is connected in front of the inlet pipe of the thermal gas mass flowmeter 6 and is used to collect temperature and / or pressure data of the gas.

[0021] Reference Figure 1 In one embodiment, the outlet of the air compressor 1 is connected (communicated) to the inlet of the air storage tank 2 via a first air supply pipe 9. The air compressor 1 is used to generate compressed air; the compressed air generated by the air compressor 1 is delivered to the air storage tank 2 for storage via the first air supply pipe 9; the air storage tank 1 is used to store gas and ensure a stable gas output (preferably, the air storage tank can further pressurize the gas supplied from the air compressor 1). Other structural details of the air compressor 1 and the air storage tank 2 can be found in existing technology and will not be described further here.

[0022] Reference Figures 1 to 9 In one embodiment, the support connection device 3 includes a first connector 10, a support column 11, and a first valve adjusting component 12; the first connector 10 is disposed on the support column 11 and communicates with the internal pipeline of the support column 11; the gas outlet of the gas storage tank 2 can be connected (communicated) to the first connector 10 through a first connecting pipe 13; the first valve adjusting component 12 is adjustablely disposed on the support column 11 and is used to control the on / off of the internal pipeline of the support column 11.

[0023] Reference Figures 1 to 9Preferably, the first connecting pipe 13 is a flexible hose for conveying high-pressure gas; the support column 11 has an inner cavity, which forms the internal pipeline; the first valve adjusting member 12 is threadedly connected to the support column 11, and by rotating and adjusting the first valve adjusting member 12, the first valve adjusting member 12 can block the gas outlet at a set position on the support column 11 in a timely manner, so that the gas can flow into the internal pipeline of the support column 11 and then stop flowing out; the first valve adjusting member 12 is threadedly connected to the support column 11, and by rotating and adjusting the first valve adjusting member 12, the first valve adjusting member 12 can no longer block the gas outlet at a set position on the support column 11 in a timely manner, so that the gas can flow into the internal pipeline of the support column 11 and continue to flow along the pipeline; the first valve adjusting member 12 can control the opening and closing of the internal pipeline of the support column 11, thereby controlling whether the gas flowing from the gas storage tank is flowing through or not at this support column 11.

[0024] Reference Figures 1 to 9 In one embodiment, the support connection device 3 further includes a pressure regulator 14, the air inlet of which is connected to the air outlet of the internal pipeline of the support column 11; the first air outlet of the pressure regulator 14 is connected to the first sampling device 4; and the second air outlet of the pressure regulator 14 is connected to the gas regulator 8 with a float flowmeter 7. The first air outlet and the second air outlet are interconnected; both the first air outlet and the second air outlet are connected to the air outlet of the internal pipeline of the support column 11.

[0025] Reference Figures 1 to 9 In one embodiment, the pressure regulator 14 is equipped with a safety valve 15, which is used to relieve pressure when the internal gas pressure of the pressure regulator 14 rises abnormally. When the gas pressure in the internal pipeline of the pressure regulator 14 exceeds a predetermined value, the gas pressure pushes open the sealing plate with a compression spring in the safety valve 15, and the internal pipeline of the pressure regulator 14 is connected to the outside in a timely manner, thereby realizing pressure relief. The remaining structural details of the safety valve can be found in the prior art and will not be described in detail here.

[0026] Reference Figures 1 to 9In one embodiment, the pressure regulator 14 has an adjustment knob 16, which is used to adjust the position of the internal valve assembly of the pressure regulator 14 to regulate the gas output pressure at the outlet of the pressure regulator 14. For example, by rotating the adjustment knob 16, the position of the internal valve assembly of the pressure regulator 14 is changed, thereby changing the size of the outlet of the pressure regulator 14, and thus regulating the gas output pressure at the outlet; for example, by adjusting the "adjustment knob 16", the gas output pressure at the first outlet of the pressure regulator 14 is regulated. The internal valve assembly of the pressure regulator is prior art and can be found in the prior art, so it will not be described in detail here.

[0027] Reference Figures 1 to 9 In one embodiment, the air inlet of the pressure regulator 14 is connected to a second connecting pipe 17, which communicates with the air inlet of the pressure regulator 14; the air outlet of the internal pipeline of the support column 11 is connected to a third connecting pipe 18, which communicates with the internal pipeline of the support column 11; the second connecting pipe 17 and the third connecting pipe 18 are detachably connected.

[0028] Reference Figures 1 to 9 In one embodiment, one end of the second connecting pipe 17 is provided with a first threaded connection portion; one end of the third connecting pipe 18 is provided with a first nut 19 for connecting with the first threaded connection portion; through the first threaded connection portion and the first nut 19, the second connecting pipe 17 and the third connecting pipe 18 can be connected.

[0029] Reference Figures 1 to 9 In one embodiment, the second outlet of the pressure regulator 14 is connected to a seventh connecting pipe 20, which communicates with the second outlet; the inlet of the gas regulator 8 is connected to an eighth connecting pipe 21, which communicates with the inlet of the gas regulator 8; the seventh connecting pipe 20 and the eighth connecting pipe 21 are detachably connected.

[0030] Reference Figures 1 to 9 In one embodiment, the eighth connecting pipe 21 is provided with a sixth threaded connection at one end; the seventh connecting pipe 20 is provided with a second nut 22 for connecting with the sixth threaded connection at one end; the eighth connecting pipe 21 and the seventh connecting pipe 20 can be connected through the sixth threaded connection and the second nut 22.

[0031] Reference Figures 1 to 9 In one embodiment, the support connection device 3 further includes a support base 23; the support column 11 is disposed on the support base 23, and the support base 23 can ensure the balance and stability of the support column 11.

[0032] Reference Figures 1 to 9 In one embodiment, the air duct supporting the connecting device 3 refers to the air duct consisting of "the vent of the first connector 10 + the internal pipe of the support column 11 + the third connecting pipe 18 + the second connecting pipe 17 + the internal pipe of the pressure regulator 14 + the seventh connecting pipe 20".

[0033] Reference Figures 1 to 9 In one embodiment, the first sampling device 4 is connected in front of the gas inlet pipe of the gas regulator 8, such as the first sampling device 4 being connected (communicated) to the first outlet of the pressure regulator 14 via the sixth connecting pipe 24. The first sampling device 4 of this invention is used to measure the temperature and / or pressure data of the gas before the gas regulator 8 inlet. The measured temperature and / or pressure data can then be substituted into a set formula to calibrate the float flowmeter 7 on the gas regulator 8.

[0034] Reference Figures 2 to 5 In one embodiment, the first sampling device 4 includes a first base 25, a first digital thermometer 26, and a first digital pressure gauge 27; the first digital thermometer 26 and the first digital pressure gauge 27 are respectively disposed on the first base 25; the first base 25 is used to connect to the front position of the gas regulator 8 inlet pipe, such that if the pressure regulator 14 is located in the opposite front position of the gas regulator 8, the inlet of the first base 25 is connected (communicated) to the first outlet of the pressure regulator 14 through the sixth connecting pipe 24; the first digital thermometer 26 is used to measure the gas temperature in the pipe inside the first base 25; the first digital pressure gauge 27 is used to measure the gas pressure in the pipe inside the first base 25.

[0035] Reference Figures 2 to 5In one embodiment, the first base 25 is provided with a first internal threaded hole 28, and the first digital thermometer 26 has a second threaded connection portion for connecting with the first internal threaded hole 28; after the first digital thermometer 26 is connected, the first digital thermometer 26 is connected to the internal pipeline of the first base 25. The first base 25 is provided with a second internal threaded hole 29, and the first digital pressure gauge 27 has a third threaded connection portion for connecting with the second internal threaded hole 29; after the first digital pressure gauge 27 is connected, the first digital pressure gauge 27 is connected to the internal pipeline of the first base 25. The air inlet 30 of the internal pipeline of the first base is connected to the first air outlet of the pressure regulator 14 through the sixth connecting pipe 24. At that time, the gas in the internal pipeline of the pressure regulator 14 is output to the internal pipeline of the first base 25 through the first air outlet. Then, the first digital thermometer 26 can detect the gas temperature in the internal pipeline of the first base 25, and the first digital pressure gauge 27 can detect the gas pressure in the internal pipeline of the first base 25, thereby obtaining temperature and / or pressure data.

[0036] Reference Figure 2 , Figure 3 , Figure 7 and Figure 8 In one embodiment, the second sampling device 5 includes a second base 31, a second digital thermometer 32, and a second digital pressure gauge 33; the second digital thermometer 32 and the second digital pressure gauge 33 are respectively disposed on the second base 31; the second base 31 is used to connect to the gas outlet of the gas regulator 8; the second digital thermometer 32 is used to measure the gas temperature in the internal pipeline of the second base 31; the second digital pressure gauge 33 is used to measure the gas pressure in the internal pipeline of the second base 31.

[0037] Reference Figure 2 , Figure 3 , Figure 7 and Figure 8In one embodiment, the second base 31 is provided with a third internal threaded hole 34, and the second digital thermometer 32 has a fourth threaded connection portion for connecting with the third internal threaded hole 34; after the second digital thermometer 32 is connected, the second digital thermometer 32 is connected to the internal pipeline of the second base 31. The second base 31 is provided with a fourth internal threaded hole 35, and the second digital pressure gauge 33 has a fifth threaded connection portion for connecting with the fourth internal threaded hole 35; after the second digital pressure gauge 33 is connected, the second digital pressure gauge 33 is connected to the internal pipeline of the second base 31. The air inlet of the internal pipeline of the second base 31 is connected to the air outlet 40 of the gas regulator through the fourth connecting pipe 37. At that time, the gas in the internal pipeline of the gas regulator 8 is output to the internal pipeline of the second base 31 through the air outlet. Then, the second digital thermometer 32 can detect the gas temperature in the internal pipeline of the second base 31, and the second digital pressure gauge 33 can detect the gas pressure in the internal pipeline of the second base 31, thereby obtaining temperature and / or pressure data.

[0038] Reference body 2 Figure 3 , Figure 6 and Figure 8 In one embodiment, a device for calibrating a float flowmeter further includes a tee connector 36 having a first connection port, a second connection port, and a third connection port, which are interconnected. The first connection port is connected to the outlet 40 of a gas regulator via a fourth connecting pipe 37; the second connection port is connected to the inlet of a second base 31; and the third connection port is connected to the inlet of a thermal gas mass flowmeter 6 via a fifth connecting pipe 38.

[0039] Reference Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9 In one embodiment, the second sampling device 5 is connected in front of the inlet pipe of the thermal gas mass flow meter 6, such as by connecting the second sampling device 5 in front of the inlet pipe of the thermal gas mass flow meter 7 via the three-way connector 36. The second sampling device 5 of this invention is used to measure the temperature and / or pressure data of the gas before the inlet of the thermal gas mass flow meter 6. The measured temperature and / or pressure data can then be substituted into a set formula to calibrate the float flow meter 7 on the gas regulator 8. The thermal gas mass flow meter 6 is used to measure the actual flow rate of the gas; the thermal gas mass flow meter 6 serves as a standard instrument.

[0040] In one embodiment, an apparatus for calibrating a float flowmeter further includes a barometer, which is independent and can directly measure atmospheric pressure in a laboratory. The barometer is an existing structure, and its specific structure can be found in the prior art, which will not be described in detail here.

[0041] Reference Figure 2 , Figure 3 and Figure 6 In one embodiment, the gas regulator 8 is equipped with a pressure gauge 39 (which is already present). This pressure gauge is used by the gas regulator 8 to measure the gas pressure at the inlet when it is used in an engineering environment. In this invention, when calibrating the float flowmeter 7, it is not necessary to read the pressure gauge.

[0042] The gas regulator 8 is equipped with a float flow meter 7 (which is already present). The float flow meter 7 is an instrument used by the gas regulator 8 to measure the gas flow at the outlet when it is used in an engineering environment. It is an instrument that needs to be calibrated in this utility model.

[0043] The "gas regulator 8 + pressure gauge 39 + float flow meter 7" is a complete set of structures used in practice. Among them, the gas regulator 8 is an existing structure. For other structural details of the gas regulator 8, please refer to the existing technology, which will not be repeated here.

[0044] In one embodiment, the float flowmeter 7 is calibrated using the "Apparatus for Calibrating a Float Flowmeter" of this utility model, and the process is as follows: S1. According to the pipeline connection relationship of this device, connect "air compressor 1, air tank 2, support connection device 3, first sampling device 4, gas regulator 8 with float flowmeter 7, second sampling device 5 and thermal gas mass flowmeter 6"; then, "air compressor 1 + air tank 2" at the source provides a continuous supply of gas for the experiment. S2. Read the indicated flow rate (gas flow rate) measured by the thermal gas mass flow meter 6 and the indicated flow rate (gas flow rate) measured by the float flow meter 7. Record the gas temperature and gas pressure data collected by the second sampling device 5, and record the gas temperature and gas pressure data collected by the first sampling device 4; wherein, combined with Figure 2 Understanding the component positions, the second sampling device 5 records the gas temperature and gas pressure before the inlet of the thermal gas mass flow meter 6; the first sampling device 4 records the gas temperature and gas pressure before the inlet of the gas regulator 8. S3. Calculate the actual flow rate of the float flowmeter under standard conditions (referring to the actual gas flow rate passing through the float flowmeter) using the following formula:

[0045] in, It is the actual flow rate (in L / min) under standard conditions of the float flowmeter. This is the flow rate (in L / min) under experimental conditions of the thermal gas mass flow meter. This flow rate refers to the gas flow rate passing through the thermal gas mass flow meter. It is the gas pressure (unit kPa) before the inlet of the thermal gas mass flow meter, which is measured by the second digital pressure gauge 33 of the second sampling device 5; It is the atmospheric pressure under experimental conditions (unit: kPa). This data is measured by a barometer, such as the atmospheric pressure measured by an independent barometer in the laboratory. It is the standard verification pressure (unit kPa), which is based on the provisions of "JJG 257 Verification Procedure for Float Flowmeter", i.e. 101.325 kPa; in practical applications, this pressure value can be set according to the different verification methods and standards used. The standard verification temperature (unit: °C) is based on the provisions of "JJG 257 Verification Procedure for Float Flowmeters", which is 20 °C. In practical applications, this temperature value can be set according to the different verification methods and standards used. It is the gas temperature (in °C) before the inlet of the thermal gas mass flow meter, which is measured by the second digital thermometer 32 of the second sampling device 5; It is the density (unit: kg / cm³) of the test medium at the standard test temperature and standard test pressure. 3 For example, the density of air (the testing medium) is 1.205 kg / cm³. 3 Among them, the verification medium refers to the specific medium used in the verification (such as calibration) process of flow meters (such as float flow meters); "verification medium" is a professional term. It is the density (unit: kg / cm³) of the calibrated medium at the standard verification temperature and standard verification pressure. 3 For example, the density of argon gas (the calibrated medium) is 1.662 kg / cm³. 3 For example, the density of carbon dioxide (the calibrated medium) is 1.829 kg / cm³. 3 Among them, calibration medium refers to the standard medium used to calibrate the flow rate scale; "calibration medium" is a professional term. It is the gas temperature (in °C) before the gas regulator inlet, which is measured by the first digital thermometer 26 of the first sampling device 4; It is the temperature of the medium marked on the float flowmeter 7 (unit: °C). It is the pressure of the medium marked on the scale of the float flowmeter 7 (unit: kPa). It is the outlet set pressure (unit: kPa) specified in the instruction manual for gas regulator 8.

[0046] Finally, the result can be obtained through formula calculation. According to actual parameters It can calibrate the float flowmeter 7.

[0047] In contrast, previously, to measure and calibrate the float flowmeter 7, it was necessary to remove the float flowmeter 7 from the gas regulator 8. However, the float flowmeter 7 and the gas regulator 8 were precisely sealed with thread sealant at the factory, making the removal of the float flowmeter 7 and the gas regulator 8 extremely troublesome. Moreover, once the float flowmeter 7 and the gas regulator 8 were removed, it was difficult to restore their seal. In addition, when the float flowmeter 7 was removed for measurement and calibration, its reading was extremely sensitive to the state of the inlet gas. Although the float flowmeter 7 showed a passing result when calibrated independently, it could not be guaranteed that the reading would still be accurate when used as a set (used as a set: such as "gas regulator 8 + pressure gauge 39 + float flowmeter 7").

[0048] This invention enables the measurement and calibration of the float flowmeter 7 without disassembling the float flowmeter 7 and the gas regulator 8. In one embodiment, this invention, "A device for calibrating a float flowmeter," retains the complete structure of "gas regulator 8 + pressure gauge 39 + float flowmeter 7" when measuring and calibrating the float flowmeter 7. Afterwards, experimental measurement and calibration of the float flowmeter 7 are performed, and the obtained experimental data more closely reflects the actual usage of the float flowmeter 7, thus helping to reduce the calibration error of the float flowmeter 7.

[0049] Other aspects of the device for calibrating a float flowmeter described in this utility model are found in the prior art and will not be repeated here.

[0050] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A device for calibrating a float flowmeter, characterized in that, The device includes an air compressor, an air tank, a support and connection device, a first sampling device, a second sampling device, and a thermal gas mass flow meter. The air compressor is connected to the air tank. The air tank is connected to the air guide pipe of the support and connection device. A gas regulator with a float flow meter has its inlet connected to the air guide pipe of the support and connection device. The first sampling device is connected in front of the inlet pipe of the gas regulator and is used to collect gas temperature and / or pressure data. The inlet of the thermal gas mass flow meter is connected to the outlet of the gas regulator, and the outlet of the thermal gas mass flow meter is connected to the external environment. The second sampling device is connected in front of the inlet pipe of the thermal gas mass flow meter and is used to collect gas temperature and / or pressure data.

2. The apparatus for calibrating a float flowmeter according to claim 1, characterized in that, The supporting connection device includes a first connector, a support column, and a first valve adjusting component; the first connector is disposed on the support column and communicates with the internal pipeline of the support column; the gas outlet of the gas storage tank can be connected to the first connector through a first connecting pipe; the first valve adjusting component is adjustablely disposed on the support column and is used to control the on / off state of the internal pipeline of the support column.

3. The apparatus for calibrating a float flowmeter according to claim 2, characterized in that, The support connection device also includes a pressure regulator, the air inlet of which can be connected to the air outlet of the internal pipeline of the support column; the first air outlet of the pressure regulator is connected to the first sampling device; and the second air outlet of the pressure regulator is connected to a gas regulator with a float flow meter.

4. The apparatus for calibrating a float flowmeter according to claim 3, characterized in that, The pressure regulator is equipped with a safety valve, which is used to relieve pressure when the gas pressure inside the pressure regulator rises abnormally.

5. The apparatus for calibrating a float flowmeter according to claim 3, characterized in that, The pressure regulator has an adjustment knob, which is used to adjust the position of the internal valve assembly of the pressure regulator to adjust the gas output pressure at the outlet of the pressure regulator.

6. The apparatus for calibrating a float flowmeter according to claim 3, characterized in that, The pressure regulator's air inlet is connected to a second connecting pipe; the air outlet of the internal pipeline of the support column is connected to a third connecting pipe; the second connecting pipe and the third connecting pipe are detachably connected.

7. An apparatus for calibrating a float flowmeter according to any one of claims 2 to 6, characterized in that, The support connection device further includes a support base; the support column is disposed on the support base.

8. An apparatus for calibrating a float flowmeter according to any one of claims 1 to 6, characterized in that, The first sampling device includes a first base, a first digital thermometer, and a first digital pressure gauge; the first digital thermometer and the first digital pressure gauge are respectively disposed on the first base; the first base is used to connect to the front position of the gas regulator inlet pipe; the first digital thermometer is used to measure the gas temperature in the pipe inside the first base; the first digital pressure gauge is used to measure the gas pressure in the pipe inside the first base.

9. An apparatus for calibrating a float flowmeter according to any one of claims 1 to 6, characterized in that, The second sampling device includes a second base, a second digital thermometer, and a second digital pressure gauge; the second digital thermometer and the second digital pressure gauge are respectively mounted on the second base; the second base is used to connect to the outlet of the gas regulator; the second digital thermometer is used to measure the gas temperature in the internal pipeline of the second base; the second digital pressure gauge is used to measure the gas pressure in the internal pipeline of the second base.

10. The apparatus for calibrating a float flowmeter according to claim 9, characterized in that, It also includes a three-way connector, which has a first connection port, a second connection port and a third connection port. The first connection port is connected to the outlet of the gas regulator through a fourth connecting pipe; the second connection port is connected to the inlet of the second base; and the third connection port is connected to the inlet of the thermal gas mass flow meter through a fifth connecting pipe.

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