A calibration device for a piston-type small-flow gas flow meter

Abstract

This invention provides a calibration device for a piston-type small-flow gas flow meter. The invention relates to the field of flow meter technology. The calibration device for a piston-type small-flow gas flow meter includes an input disc seat and an output disc seat, which are laterally symmetrically distributed. A transfer valve seat is fixed in each of the input and output disc seats. The advantages of this invention are: by using the rear-arranged input and output disc seats as the connection points of the flow meter, during flow meter calibration, the transfer valve seat and the connected metering disc can be used to calibrate the input gas flow rate data and the gas flow rate data after passing through the flow meter. This data, combined with actual flow meter measurements, provides feedback, facilitating data collection by calibration personnel. Furthermore, it allows for the calculation of the flow rate loss rate based on the preceding and following data to pinpoint the given range of gas flow rates, facilitating small-flow data measurement and improving the practicality of the calibration device.

Description

Technical Field

[0001] This invention relates to the field of flow meter technology, and specifically to a calibration device for a piston-type small-flow gas flow meter. Background Technology

[0002] A gas flow meter is an instrument that measures the flow rate of gas. It is installed in a pipeline to record the amount of gas flowing through it. It is one of the major categories of instruments in process automation instruments and devices. It is widely used in various sectors of the national economy, including metallurgy, power, coal, chemical, petroleum, transportation, construction, light industry, textiles, food, medicine, agriculture, environmental protection, and people's daily lives. It is an important tool for developing industrial and agricultural production, saving energy, improving product quality, and enhancing economic efficiency and management level, and occupies an important position in the national economy.

[0003] Due to the unique metrological characteristics of piston-type small-flow gas flow meters, the dynamic movement of the piston structure directly determines the metering accuracy and precision of the gas flow meter when dealing with small-flow gas detection. Therefore, calibration of the gas flow meter is an important measure to ensure accuracy and reliability. Existing calibration methods for flow meters typically involve limiting the input flow rate and then comparing and manually adjusting the data based on the limited flow rate and the actual measured value of the flow meter. However, this calibration method is not suitable for small-flow gas flow meters. Due to the inherent velocity and flow rate limitations of small-flow gas, there is a significant velocity loss before and after passing through the flow meter pipeline, resulting in a large error in the measured data. The calibration process requires strict control over the airtightness of the given gas pipeline and the flow meter pipeline, which is cumbersome and affects the calibration efficiency of the flow meter. Summary of the Invention

[0004] To address the aforementioned technical problems in the existing technology, a calibration device for a piston-type small-flow gas flow meter is provided.

[0005] The objectives and effects of this invention are achieved by the following specific technical means:

[0006] A calibration device for a piston-type small flow gas meter includes an input plate base and an output plate base, the input plate base and the output plate base are symmetrically distributed laterally, a transfer valve seat is fixed in both the input plate base and the output plate base, and a rotating core is provided through the upper end of the transfer valve seat, and a metering plate is provided on the upper end of the rotating core for measuring the gas flow rate.

[0007] Both the input and output panels are fitted with tube seats at adjacent ends. A connecting tube is inserted into the tube seat. A telescopic fitting, a pump pipe, and an air chamber are sequentially connected between the connecting tube and the tube seat for connecting the inlet and outlet ports of the flow meter.

[0008] A further preferred embodiment: a transmission box is fixed to the bottom inner side of the input panel base, the transmission box is based on wireless communication transmission, and the transmission box is connected in series with the metering panel.

[0009] A further preferred embodiment: the metering disc is a vortex flow meter, and the rotating core is the probe end of the metering disc.

[0010] A further preferred embodiment: a valve port pipe is provided on the other side of the location adjacent to the input disc seat and the output disc seat, and the valve port pipe is interconnected with the adjacent transfer valve seat.

[0011] A further preferred embodiment: a pair of bushings are provided at intervals between the input disk base and the output disk base, and a compression spring is fixed between the bushings and the adjacent input disk base and output disk base.

[0012] A further preferred embodiment: both of the two liner plates are fixed with a fixed plate at their lower ends, and a telescopic shaft is provided between the two fixed plates, with a telescopic shaft passing through the telescopic shaft and the fixed plate.

[0013] A further preferred embodiment: a port plate is provided on the side of the docking tube away from the tube seat, a convection ring is provided through the air chamber and the port plate, a docking groove is formed on the inner side of the convection ring, and several side pipes are provided through the docking groove and the convection ring, and the several side pipes are distributed in a ring.

[0014] A further preferred embodiment: a sealing ring is fitted onto the surface of the docking tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This calibration device for a piston-type small-flow gas flow meter uses an input and output disc seat arranged at the front and rear as the connection points of the flow meter. During the calibration of the flow meter, the intermediate valve seat and the connected metering disc can be used to calibrate the input gas flow rate data and the gas flow rate data after passing through the flow meter. Based on this data and combined with the actual measured data of the flow meter, feedback is provided. This makes it convenient for calibration personnel to collect data, and at the same time, the flow rate loss rate can be calculated from the front and rear data to locate the given value range of gas flow rate. This facilitates the measurement of small flow rates and improves the practicality of the calibration device.

[0017] Meanwhile, the calibration device facilitates the fitting of the connecting tube and the liner to the inlet and outlet ports of the flow meter. While ensuring the airtightness of the pipeline during the calibration process, the convection pipeline formed between the connecting tube and the flow meter ensures the accuracy of the given gas flow rate, further facilitating the data calibration of small flow gas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the telescopic shaft tube structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the docking cannula structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the docking cannula of the present invention.

[0023] The markings in the diagram are: 1-Input disc base; 2-Rack plate; 3-Output disc base; 4-Dating tube; 5-Telescopic shaft fitting; 6-Valve port pipe; 7-Fixing disc; 8-Telescopic shaft; 9-Sealing ring; 10-Pipe port disc; 11-Dating groove; 12-Compression spring ring; 13-Transfer valve seat; 14-Metering disc; 15-Rotating core; 16-Transfer box; 17-Pipe base; 18-Telescopic fitting; 19-Air chamber; 20-Connecting pump pipe; 21-Side pipe; 22-Convection ring. Detailed Implementation

[0024] Please see Figure 1-5 The embodiments of the present invention will be further described below;

[0025] A calibration device for a piston-type small flow gas meter includes an input plate seat 1 and an output plate seat 3. The input plate seat 1 and the output plate seat 3 are symmetrically distributed laterally. A transfer valve seat 13 is fixed in both the input plate seat 1 and the output plate seat 3. A rotating core 15 is provided through the upper end of the transfer valve seat 13, and a metering plate 14 is provided on the upper end of the rotating core 15 for measuring the flow rate of the gas passing through.

[0026] Both the input panel 1 and the output panel 3 are connected to a tube seat 17. A connecting tube 4 is inserted into the tube seat 17. A telescopic fitting 18, a connecting pump pipe 20 and an air chamber 19 are sequentially connected between the connecting tube 4 and the tube seat 17 for connecting the inlet and outlet ports of the flow meter.

[0027] The metering disc 14 is a vortex flow meter, and the rotating core 15 is the probe end of the metering disc 14. The metering disc 14 is connected to the intermediate valve seat 13 through the rotating core 15 to measure the gas flow rate through the intermediate valve seat 13.

[0028] Based on the above, a transmission box 16 is fixed to the bottom inner side of the input plate base 1. The transmission box 16 is based on wireless communication transmission and is connected in series with the measuring plate 14. The transmission box 16 outputs the calibration data of the measuring plate 14 in the form of wireless communication to transmit and feedback the values.

[0029] Furthermore, a valve port pipe 6 is provided on the other side of the adjacent position of the input plate 1 and the output plate 3, and the valve port pipe 6 is interconnected with the adjacent transfer valve seat 13. The valve port pipe 6 serves as the input end of the given gas in the input plate 1 and the output end of the given gas in the output plate 3 of the calibration device, and is used to connect to the given gas pipeline.

[0030] like Figure 4 As shown, a pair of bushings 2 are spaced apart at the adjacent positions of the input plate seat 1 and the output plate seat 3, and a compression spring ring 12 is fixed between the bushings 2 and the adjacent input plate seat 1 and output plate seat 3. In this calibration device, the input plate seat 1 and the output plate seat 3 serve as the docking structures for the left and right ends of the gas flow meter, respectively. During the docking process, the bushings 2 serve as the contact ends of the input plate seat 1, the output plate seat 3 and the gas flow meter, and the expansion and contraction of the compression spring ring 12 is used to meet the tight docking of different sizes and specifications. The freely retractable bushings 2 ensure the stability of the docking structure between the input plate seat 1, the output plate seat 3 and the gas flow meter.

[0031] Furthermore, a fixed plate 7 is fixed to the lower end of each of the two liner plates 2, and a telescopic shaft fitting 5 is provided between the two fixed plates 7. A telescopic shaft 8 is provided through the telescopic shaft fitting 5 and the fixed plate 7. The calibration device connects the left and right input plate seats 1 and output plate seats 3 through the horizontally arranged telescopic shaft fitting 5. The telescopic shaft fitting 5 and the telescopic shaft 8 can be pulled and stretched horizontally to adapt to the size and specifications of the flow meter by adjusting the distance between the input plate seat 1 and the output plate seat 3, thereby improving the applicability of the calibration device.

[0032] like Figure 4 , 5 As shown, a pipe port disc 10 is provided on the side of the docking tube 4 away from the pipe seat 17. A convection ring 22 is provided between the gas chamber 19 and the pipe port disc 10. A docking groove 11 is formed on the inner side of the convection ring 22, and several side pipes 21 are provided through the docking groove 11 and the convection ring 22. The several side pipes 21 are arranged in a ring. After the input disc seat 1, the output disc seat 3 and the gas flow meter are docked, the laterally extended pipe seat 17 and the docking tube 4 are used to insert into the gas flow meter pipeline. The intermediate valve seat 13 and the gas flow meter are connected by the interconnected telescopic fitting 18, the connecting pump pipe 20 and the gas chamber 19. The arrangement of the pipeline, side connector 21, and docking groove 11 allows the gas to enter the flow meter pipeline in sequence along the convection ring 22, side connector 21, and docking groove 11. This changes the radial direction of the gas flow meter entering the transfer valve seat 13. The relatively symmetrically distributed left and right ends of the docking tubes 4 form an axial convection pipeline with the flow meter pipeline. This ensures smooth gas flow through the flow meter pipeline while avoiding large flow rate changes and velocity losses in the radial pipeline caused by the gas flow entering from the input disc seat 1, which could lead to large errors in the calibration data. This improves the reliability of the calibration data of the calibration device.

[0033] Among them, a sealing ring 9 is sleeved on the surface of the docking tube 4. The sealing ring 9 is made of rubber to ensure the docking stability of the docking tube 4 and the inner wall of the flow meter pipeline and the airtightness of the pipeline when the docking tube 4 is connected to the flow meter pipeline.

Claims

1. A calibration device for a piston-type small-flow gas flow meter, comprising an input disc base (1) and an output disc base (3), wherein the input disc base (1) and the output disc base (3) are laterally symmetrically distributed, characterized in that: Both the input plate seat (1) and the output plate seat (3) are fixed with a transfer valve seat (13), and a rotating core (15) is provided through the upper end of the transfer valve seat (13), and a metering plate (14) is provided on the upper end of the rotating core (15) for measuring the gas flow rate. The input panel (1) and the output panel (3) are each connected to a tube seat (17). A connecting tube (4) is inserted into the tube seat (17). A telescopic tube (18) and a connecting pump tube (20) and an air chamber (19) are sequentially connected between the connecting tube (4) and the tube seat (17) for connecting the flow meter inlet and outlet ports. A port plate (10) is provided on the side of the docking tube (4) away from the tube seat (17). A convection ring (22) is provided between the air chamber (19) and the port plate (10). A docking groove (11) is formed on the inner side of the convection ring (22). Several side pipes (21) are provided between the docking groove (11) and the convection ring (22), and the several side pipes (21) are arranged in a ring.

2. The calibration device for a piston-type small-flow gas flow meter according to claim 1, characterized in that: The input disk base (1) has a transmission box (16) fixed at the bottom inner side. The transmission box (16) is based on wireless communication transmission and is connected in series with the metering disk (14).

3. The calibration device for a piston-type small-flow gas flow meter according to claim 1, characterized in that: The metering disc (14) is a vortex flow meter, and the rotating core (15) is the probe end of the metering disc (14).

4. The calibration device for a piston-type small-flow gas flow meter according to claim 1, characterized in that: A valve port pipe (6) is provided on the other side of the adjacent position of the input plate seat (1) and the output plate seat (3), and the valve port pipe (6) is interconnected with the adjacent transfer valve seat (13).

5. The calibration device for a piston-type small-flow gas flow meter according to claim 1, characterized in that: A pair of bushings (2) are provided at intervals between the input disk seat (1) and the output disk seat (3), and a compression spring ring (12) is fixed between the bushings (2) and the adjacent input disk seat (1) and output disk seat (3).

6. The calibration device for a piston-type small-flow gas flow meter according to claim 5, characterized in that: The lower ends of the two liner plates (2) are fixed with a fixed plate (7), and a telescopic shaft tube (5) is provided between the two fixed plates (7), and a telescopic shaft (8) is provided through the telescopic shaft tube (5) and the fixed plate (7).

7. The calibration device for a piston-type small-flow gas flow meter according to claim 1, characterized in that: A sealing ring (9) is fitted onto the surface of the docking tube (4).

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