A gas flow meter

Abstract

A gas flowmeter relates to the technical field of gas metering. The flow detection unit is installed on the metering pipe, the metering pipe is connected with the drying chamber, the drying chamber is provided with the water storage cavity at the lower part of the flow passage, the water pump is arranged on the side of the water storage cavity, the water pump extends to the rear end of the flow detection unit and extends into the metering pipe, and the gas-water separation system is installed in the drying chamber. The beneficial effects of the present application are that the gas-water separation system separates the water in the gas and enters the water storage cavity, the water in the gas is separated in the drying chamber, and then the gas is metered, so that the influence of the water in the gas on the sensing effect of the temperature sensor is avoided, the accuracy of the metering is improved, the separated water flows into the metering pipe from the rear end of the flow detection unit, the separated water is not discharged to the outside, no pollution is caused, the composition of the measured gas is not damaged, the pressure sensing sheet is arranged on the water scraping assembly, when the water absorbing cotton absorbs water and expands, the water can be automatically squeezed out and enter the water storage cavity, the water absorbing cotton does not need to be replaced, and the water absorbing state can be maintained for a long time.

Description

Technical Field

[0001] This invention relates to the field of gas metering technology, and more particularly to a gas flow meter. Background Technology

[0002] In the prior art, thermal flow meters calculate the flow rate by measuring the temperature change of gas as it flows through a thermal element. They are suitable for measuring low-flow-rate gases, but they are sensitive to gas composition. If the gas contains moisture, condensation will form on the detector surface, affecting the sensing effect of the temperature sensor.

[0003] Announcement No. CN 120538619 B discloses a gas flow meter that uses a porous water-absorbing plate and other structures to absorb moisture in the gas, preventing condensation from forming on the surface of the temperature sensor. However, in this technical solution, the porous water-absorbing plate needs to be replaced. Replacing the porous water-absorbing plate causes drawbacks such as metering interruption, gas leakage, and environmental pollution. It also poses occupational hazards for harmful gases. Furthermore, separating water from gas alters the composition of the gas being metered. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a gas flow meter.

[0005] The technical solution provided by this invention is: a gas flow meter, including a metering tube, which is horizontally installed. A flow detection unit is installed on the metering tube. The metering tube is connected to a drying chamber in the gas inlet direction through a transition pipe A. A flange B is welded to the metering tube in the gas outlet direction. The drying chamber includes a square flow cavity, which is connected to the metering tube through the transition pipe A. A transition pipe B is welded to the flow cavity in the gas inlet direction, and a flange A is welded to the other side of the transition pipe B. A water storage chamber is provided in the lower part of the flow cavity of the drying chamber. A water pumping pipe is provided on the side of the water storage chamber. The water pumping pipe extends to the rear end of the flow detection unit and enters the metering tube. The water pumping pipe extends into the metering tube at an angle in the gas outflow direction. A gas-water separation system is installed in the drying chamber.

[0006] The air-water separation system includes absorbent cotton, which is installed in the flow chamber. The flow chamber has strip-shaped holes on both the upper and lower ends. The absorbent cotton includes a body, which is made of absorbent material and has a plate-like structure. A limiting block is provided on the upper side of the body. The body is inserted into the flow chamber through the upper strip-shaped hole and extends into the water storage chamber through the lower strip-shaped hole. The water storage chamber has a vertical square tube structure, and the limiting block rests on the flow chamber.

[0007] The main body is equipped with a wiper assembly on its outer side, which includes a wiper frame. A column is fixedly connected to the lower part of the wiper frame. A round hole is opened on the lower end face of the flow chamber. The column passes downward through the round hole and is fixedly connected to the support plate. The support plate is fitted with the water storage chamber on both sides in the air intake direction. Two magnetic strips are provided on the outer side of the water storage chamber. The two magnetic strips are located at the parts where the support plate and the water storage chamber are fitted. The two magnetic strips are fixedly connected by two round steel bars. The two round steel bars are fixedly connected to the gantry frame. The gantry frame spans the upper part of the drying chamber. The upper part of the drying chamber is sealed to the top cover by bolts. An electric push rod is installed on the top cover. The electric push rod is installed vertically. The telescopic rod of the electric push rod is fixedly connected to the gantry frame. The bottom of the water storage chamber is sealed to the bottom plate by bolts.

[0008] A water inlet valve is connected to the water pump pipe via a T-junction.

[0009] The inside of the wiper frame is attached to the outside of the absorbent cotton body. A pressure sensor is installed inside the wiper frame. The flow detection unit integrates a solar cell and an automatic control system. The automatic control system is electrically connected to an electric push rod by wires. When the pressure of the pressure sensor reaches the set value, the electric push rod moves, causing the magnetic strip to descend and then rise.

[0010] The drying chamber is made of stainless steel, and the pallets are made of carbon steel.

[0011] Two or more absorbent cottons are provided, and the absorbent cottons are arranged obliquely along the cross-section of the flow cavity, with the two adjacent absorbent cottons inclined in opposite directions.

[0012] The main body has evenly distributed strip-shaped grooves, which are arranged vertically.

[0013] The beneficial effects of this invention are as follows: The gas-water separation system separates water from the gas and allows it to enter the water storage chamber. Because the water pumping pipe extends into the metering tube and is inclined in the direction of gas flow, a jet effect is generated when the gas flows, drawing water from the water pumping pipe into the metering tube and flowing out with the gas. After the water in the gas is separated in the drying chamber, it is measured, avoiding the water in the gas from affecting the sensing effect of the temperature sensor and improving the accuracy of the measurement. The separated water flows into the metering tube from the rear end of the flow detection unit. While ensuring the accuracy of the measurement, the separated water is not discharged to the outside, does not cause pollution, and does not damage the components of the measured gas. A pressure-sensitive plate is set in the water scraper assembly. When the absorbent cotton absorbs water and expands, it can automatically squeeze the water into the water storage chamber. The absorbent cotton does not need to be replaced and can maintain a long-term absorbent state. Attached Figure Description

[0014] Appendix Figure 1 This is a three-dimensional diagram of the present invention;

[0015] Appendix Figure 2 This is a side view of the present invention;

[0016] Appendix Figure 3 It is attached Figure 2AA cross-section view;

[0017] Appendix Figure 4 It is attached Figure 3 BB cross-section;

[0018] Appendix Figure 5 This is a schematic diagram of the drying chamber.

[0019] Appendix Figure 6 This is a structural diagram of absorbent cotton;

[0020] Appendix Figure 7 This is a structural diagram of the wiper assembly and tray.

[0021] In the diagram, 1-flow detection unit, 2-metering tube, 3-drying chamber, 301-flow cavity, 302-water storage cavity, 303-strip hole, 304-round hole, 4-gantry frame, 5-electric push rod, 6-water suction pipe, 7-absorbent cotton, 701-body, 702-limiting block, 703-strip groove, 8-scraper assembly, 801-column, 802-scraper frame, 9-support plate, 10-base plate, 11-top cover, 12-magnetic strip, 13-round steel, 14-water valve, 15-pressure sensing plate, 16-transition pipe A, 17-transition pipe B, 18-flange A, 19-flange B. Detailed Implementation

[0022] like Figures 1-7 As shown, a gas flow meter includes a metering tube 2, which is horizontally installed. A flow detection unit 1 is installed on the metering tube 2. The metering tube 2 is connected to a drying chamber 3 in the inlet direction via a transition pipe A16. A flange B19 is welded to the metering tube 2 in the outlet direction. The drying chamber 3 includes a square flow cavity 301, which is connected to the metering tube 2 via the transition pipe A16. A transition pipe B17 is welded to the flow cavity 301 in the inlet direction, and a flange A18 is welded to the other side of the transition pipe B17. A water storage chamber 302 is provided at the lower part of the flow cavity 301 in the drying chamber 3. A water pumping pipe 6 is provided on the side of the water storage chamber 302. The water pumping pipe 6 extends to the rear end of the flow detection unit 1 and enters the metering tube 2. The water pumping pipe 6 extends into the metering tube 2 at an angle in the gas outflow direction. A gas-water separation system is installed in the drying chamber 3.

[0023] The air-water separation system includes absorbent cotton 7, which is installed in the flow chamber 301. The flow chamber 301 has strip-shaped holes 303 on both the upper and lower ends. The absorbent cotton 7 includes a body 701, which is made of absorbent material and has a plate-like structure. A limiting block 702 is provided on the upper side of the body 701. The body 701 is inserted into the flow chamber 301 through the upper strip-shaped hole 303 and extends into the water storage chamber 302 through the lower strip-shaped hole 303. The water storage chamber 302 has a vertical square tube structure, and the limiting block 702 rests on the flow chamber 301.

[0024] The main body 701 is provided with a wiper assembly 8 on the outside. The wiper assembly 8 includes a wiper frame 802. The lower part of the wiper frame 802 is fixedly connected to a column 801. The lower end face of the flow cavity 301 has a round hole 304. The column 801 passes downward through the round hole 304 and is fixedly connected to a support plate 9. The support plate 9 is in clearance fit with the water storage cavity 302 on both sides in the air intake direction. Two magnetic strips 12 are provided on the outside of the water storage cavity 302. The two magnetic strips 12 are located at the parts where the support plate 9 and the water storage cavity 302 are in clearance fit. The two magnetic strips 12 are fixedly connected by two round steel bars 13. The two round steel bars 13 are fixedly connected to a gantry frame 4. The gantry frame 4 spans the upper part of the drying chamber 3. The upper part of the drying chamber 3 is sealed to the upper cover 11 by bolts. An electric push rod 5 is installed on the upper cover 11. The electric push rod 5 is installed vertically. The telescopic rod of the electric push rod 5 is fixedly connected to the gantry frame 4. The bottom of the water storage cavity 302 is sealed to the bottom plate 10 by bolts.

[0025] A water inlet valve 14 is connected to the water inlet pipe 6 via a tee. During initial installation, clean water is added to the water storage chamber 302 and the water inlet pipe 6 through the water inlet valve 14, thereby forming a water seal at the air inlet and air outlet (the pressure difference between the air inlet and outlet cannot draw out this part of the water), thus preventing the flow chamber 301 and the outlet of the water inlet pipe 6 from being connected, and preventing some gas from passing through the flow detection unit 1 from this flow part, resulting in inaccurate measurement.

[0026] The inner side of the wiper frame 802 is attached to the outer side of the absorbent cotton 7 body 701. A pressure sensor 15 is installed on the inner side of the wiper frame 802. The flow detection unit 1 integrates a solar cell and an automatic control system. The automatic control system is electrically connected to the electric push rod 5 by wires. When the pressure of the pressure sensor 15 reaches the set value, that is, when the absorbent cotton 7 absorbs water and expands, the telescopic rod of the electric push rod 5 descends, driving the gantry 4 and the magnetic strip 12 to descend. Under the action of magnetic force, the magnetic strip 12 drives the support plate 9, the column 801 and the wiper frame 802 to descend, squeezing the water in the absorbent cotton 7 into the water storage chamber 302. Then the telescopic rod of the electric push rod 5 rises, and the wiper frame 802 returns to the top, so that the absorbent cotton 7 maintains a long-term water-absorbing state.

[0027] The gas-water separation system separates water from the gas and sends it into the water storage chamber 302. As the water pumping pipe 6 extends into the metering pipe 2 and is inclined in the direction of gas outflow, a jet effect is generated when the gas flows, drawing the water in the water pumping pipe 6 into the metering pipe 2 and outflowing with the gas. After the water in the gas is separated in the drying chamber 3, it is measured to avoid the water in the gas affecting the sensing effect of the temperature sensor and improve the accuracy of the measurement. The separated water flows into the metering pipe 2 from the rear end of the flow detection unit 1. While ensuring the accuracy of the measurement, the separated water is not discharged to the outside, does not cause pollution, and does not damage the components of the measured gas. A pressure-sensitive plate 15 is set in the water scraper assembly 8. When the water-absorbing cotton 7 absorbs water and expands, it can automatically squeeze the water into the water storage chamber 302. The water-absorbing cotton 7 does not need to be replaced and can maintain a long-term water-absorbing state.

[0028] The drying chamber 3 is made of stainless steel, and the tray 9 is made of carbon steel. Stainless steel is non-magnetic, and the magnetic force of the magnetic strip 12 acts on the tray 9.

[0029] Two or more absorbent cotton 7 are provided. The absorbent cotton 7 is arranged obliquely along the cross section of the flow cavity 301 to increase the water absorption area. The two adjacent absorbent cotton 7 are inclined in opposite directions, which creates a deflection when the gas flows through, increasing the contact area between the water and the absorbent cotton 7 and reducing the residual water content in the gas.

[0030] The main body 701 has evenly distributed strip-shaped grooves 703. The strip-shaped grooves 703 are arranged vertically to increase the chance of collision between moisture in the gas and the absorbent cotton 7, thereby improving the water absorption efficiency.

Claims

1. A gas flow meter, comprising a metering tube (2), characterized in that: The metering tube (2) is installed horizontally, and a flow detection unit (1) is installed on the metering tube (2). The metering tube (2) is connected to the drying chamber (3) in the inlet direction through a transition pipe A (16). A flange B (19) is welded to the metering tube (2) in the outlet direction. The drying chamber (3) includes a square flow cavity (301). The flow cavity (301) is connected to the metering tube (2) through the transition pipe A (16). A flange B (19) is welded to the flow cavity (301) in the inlet direction. Transition pipe B (17), flange A (18) is welded on the other side of transition pipe B (17), drying chamber (3) has a water storage chamber (302) at the bottom of the flow chamber (301), water storage chamber (302) has a water pumping pipe (6) on the side of the water storage chamber (302), water pumping pipe (6) extends to the rear end of flow detection unit (1) and enters into metering pipe (2), water pumping pipe (6) extends into metering pipe (2) and is inclined in the direction of gas outflow, and a gas-water separation system is installed in drying chamber (3); The gas-water separation system includes absorbent cotton (7), which is installed in the flow chamber (301). The flow chamber (301) has strip holes (303) on both the upper and lower ends. The absorbent cotton (7) includes a body (701), which is made of absorbent material. The body (701) has a plate-like structure. A limiting block (702) is provided on the upper side of the body (701). The body (701) is inserted into the flow chamber (301) through the strip hole (303) on the upper side. The body (701) extends into the water storage chamber (302) through the strip hole (303) on the lower side. The water storage chamber (302) has a vertical square tube structure. The limiting block (702) rests on the flow chamber (301). The main body (701) is provided with a wiper assembly (8) on its outer side. The wiper assembly (8) includes a wiper frame (802). The lower part of the wiper frame (802) is fixedly connected to a column (801). A circular hole (304) is opened on the lower end face of the flow cavity (301). The column (801) passes downward through the circular hole (304) and is fixedly connected to a support plate (9). The support plate (9) is in clearance fit with the water storage cavity (302) on both sides in the air intake direction. Two magnetic strips (12) are provided on the outer side of the water storage cavity (302). The two magnetic strips (12) are located on the support plate (9). At the part that fits with the water storage chamber (302), two magnetic strips (12) are fixedly connected by two round steel bars (13), and the two round steel bars (13) are fixedly connected to the gantry frame (4). The gantry frame (4) spans the upper part of the drying chamber (3). The upper part of the drying chamber (3) is sealed with the cover (11) by bolts. An electric push rod (5) is installed on the cover (11). The electric push rod (5) is installed vertically. The telescopic rod of the electric push rod (5) is fixedly connected to the gantry frame (4). The bottom of the water storage chamber (302) is sealed with the bottom plate (10) by bolts. The inside of the wiper frame (802) is attached to the outside of the absorbent cotton (7) body (701). A pressure sensor (15) is installed inside the wiper frame (802). The flow detection unit (1) integrates a solar cell and an automatic control system. The automatic control system is electrically connected to an electric push rod (5) by wires. When the pressure of the pressure sensor (15) reaches the set value, the electric push rod (5) moves to make the magnet strip (12) descend and then rise.

2. A gas flow meter according to claim 1, characterized in that: A water inlet valve (14) is connected to the water inlet pipe (6) via a tee.

3. A gas flow meter according to claim 1, characterized in that: The drying chamber (3) is made of stainless steel, and the pallet (9) is made of carbon steel.

4. A gas flow meter according to claim 1, characterized in that: Two or more absorbent cotton (7) are provided. The absorbent cotton (7) is arranged obliquely along the cross section of the flow cavity (301). The two adjacent absorbent cotton (7) are inclined in opposite directions.

5. A gas flow meter according to claim 4, characterized in that: The main body (701) has evenly distributed strip grooves (703), which are arranged vertically.

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