A resolution-adjustable micro gas flow meter

Abstract

The present application relates to the field of gas measurement, especially to a resolution-adjustable micro gas flowmeter, comprising a shell, a base fixedly arranged at the bottom of the shell, an air inlet pipe through-arranged on the base, a top cover arranged at the top of the shell, an air outlet pipe and a liquid inlet arranged on the top cover respectively, the air inlet pipe and the air outlet pipe being communicated with the inner cavity of the shell, a pivot rotatably installed in the shell, a counter connected to one end of the pivot, a plurality of partitions uniformly arranged on the circumferential outer wall of the pivot, and a side plate fixedly arranged between the two ends of adjacent two partitions, wherein the pivot is driven to rotate continuously by the rotating and reciprocating bubble trapping and releasing process realized by the gas collection cavity, the rotation process of the pivot is counted by the counter, the gas flow can be accurately detected, the gas collection amount required when the gas collection cavity floats can be realized by controlling the expansion and contraction degree of the air bag, and the resolution adjustment of the gas flow detection is realized.

Description

Technical Field

[0001] This invention relates to the field of gas measurement technology, and in particular to a micro gas flow meter with adjustable resolution. Background Technology

[0002] A gas flow meter is an instrument used to measure the flow rate of gas (the volume or mass of gas passing through per unit time), and it is widely used in industries such as industry, energy, environmental protection, and medicine. Its core function is to accurately monitor, control, and record gas flow to ensure process safety, energy efficiency optimization, and compliant emissions.

[0003] Current gas flow meters are generally designed for measuring large flow rates of gas, and their measurement range is generally high. However, when a small amount of gas flows, its pressure and velocity are low, requiring higher measurement resolution. Traditional gas flow meters will produce large errors during measurement, resulting in inaccurate measurements. Summary of the Invention

[0004] The purpose of this invention is to provide a micro gas flow meter with adjustable resolution, thereby solving the aforementioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A micro gas flow meter with adjustable resolution includes a housing, a base fixedly mounted at the bottom of the housing, an inlet pipe extending through the base, a top cover at the top of the housing, an outlet pipe and a liquid inlet on the top cover, both the inlet and outlet pipes communicating with the inner cavity of the housing, a pivot rotatably mounted inside the housing, a counter connected to one end of the pivot, several partitions evenly arranged on the outer circumference of the pivot, a side plate fixedly mounted between the ends of two adjacent partitions, the side plate and the two adjacent partitions forming a gas collecting cavity, an air bladder fixedly mounted on each partition, a main gas pipe coaxially fixedly mounted inside the pivot, an air pump fixedly mounted on the side wall of the housing, the air pump communicating with the main gas pipe, a gas equalization plate fixedly sleeved at the center of the pivot, the main gas pipe communicating with the gas equalization plate, and the gas equalization plate communicating with each air bladder.

[0007] As a further aspect of the present invention: the gas distribution plate is provided with a plurality of air inlet chambers that correspond one-to-one with the air collection chamber, each airbag is connected to the corresponding air inlet chamber through a bronchus, and the end of the main air pipe is provided with a plurality of diverter sleeves that correspond one-to-one with the air inlet chambers, each diverter sleeve being connected to the corresponding air inlet chamber.

[0008] As a further embodiment of the present invention: the output end of the air pump is connected to one end of the air pipe, the other end of the air pipe is fixedly provided with an air inlet connector, the air pipe is provided with a regulating valve, and one end of the main air pipe is provided with a rotating part, the rotating part and the air inlet connector being rotated and sealed together.

[0009] As a further aspect of the present invention: the main air pipe is provided with an enlarged diameter channel, the end of the enlarged diameter channel near the rotating part is a narrow diameter channel, and the end of the enlarged diameter channel near the diverter sleeve is a wide diameter channel.

[0010] As a further aspect of the present invention: a fixing clip is rotatably mounted on the partition plate, the fixing clip being used to clamp and fix the airbag to the partition plate.

[0011] As a further aspect of the present invention: sealing rings are provided at the connection points between the two ends of the pivot and the housing, and the pivot and the housing form a rotational sealing fit through the sealing rings.

[0012] As a further aspect of the present invention: the inner cavity of the shell is supplied with a liquid medium through the liquid inlet, and the liquid medium covers all the gas collection chambers, forming a gas phase space between the liquid surface of the liquid medium and the top cover.

[0013] As a further aspect of the present invention: the width of the partition plate is consistent with the width of the inner cavity of the housing, and the air inlet pipe is positioned directly opposite the center of the air collection cavity.

[0014] The beneficial effects of this invention are:

[0015] (1) During measurement, the gas to be measured is introduced into the solution in the inner cavity of the shell through the inlet pipe, and bubbles are formed at the bottom of the inner cavity of the shell and gradually rise. The rising bubbles accumulate in the gas collection chamber until the buoyancy generated by the bubbles pushes the baffle to start rotating. At this time, the bottom gas collection chamber will deflect synchronously in the direction of rotation until the gas collection chamber has a gap for the bubbles to disperse relative to the horizontal direction. At this time, the bubbles will gradually disperse into the gas phase space and be discharged through the outlet pipe. The other gas collection chamber at the bottom will repeat the gas collection process, so that the gas collection chamber realizes the process of bubble collection and release by rotating back and forth, thereby driving the pivot to rotate continuously. During this process, the rotation process of the pivot is counted by a counter, so that the gas flow rate can be accurately detected.

[0016] (2) By setting up a main air pipe, a uniform air plate and air bags, the air pump can uniformly circulate air into each air bag through the main air pipe and the uniform air plate, so that the air pressure in each air bag is uniform and consistent, and thus the degree of expansion and contraction of each air bag is also consistent, that is, the buoyancy generated by each air bag is also consistent. When the air bag expands, its buoyancy increases, so the amount of bubbles to be captured when the air collecting chamber rotates decreases accordingly, that is, the amount of air collected in each air collecting chamber decreases. Conversely, when the air bag contracts, its buoyancy decreases, so the amount of bubbles to be captured when the air collecting chamber rotates increases accordingly, that is, the amount of air collected in each air collecting chamber increases. Thus, the amount of air collected when the air collecting chamber floats can be controlled by controlling the degree of expansion and contraction of the air bag, thereby realizing the resolution adjustment of gas flow detection. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

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

[0019] Figure 2 yes Figure 1 A schematic diagram of the cross-section along the AA direction.

[0020] Figure 3 This is a schematic diagram of the structure of the pivot in this invention.

[0021] Figure 4 yes Figure 1 A schematic diagram of the cross-section in the BB direction.

[0022] Figure 5 This is a schematic diagram of the installation of the main air pipe in this invention.

[0023] Figure 6 yes Figure 5 Enlarged diagram of point C in the middle.

[0024] Figure 7 This is a schematic diagram of the structure of the gas distribution disk in this invention.

[0025] Figure 8 This is a schematic diagram of the main airway in this invention.

[0026] In the diagram: 1. Shell; 101. Gas phase space; 2. Base; 201. Inlet pipe; 3. Top cover; 301. Outlet pipe; 302. Liquid inlet; 4. Air pump; 401. Vent pipe; 402. Regulating valve; 403. Inlet connector; 5. Counter; 6. Pivot; 601. Partition plate; 602. Side plate; 603. Gas collection chamber; 604. Airbag; 6041. Branch pipe; 605. Fixing clamp; 606. Sealing ring; 7. Main air pipe; 701. Diverter sleeve; 702. Rotating part; 703. Expanded diameter channel; 8. Gas distribution plate; 801. Inlet chamber. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-7 As shown, this invention is a micro gas flow meter with adjustable resolution, comprising a housing 1, a base 2 fixedly mounted at the bottom of the housing 1, an inlet pipe 201 extending through the base 2, a top cover 3 mounted at the top of the housing 1, an outlet pipe 301 and a liquid inlet 302 respectively mounted on the top cover 3, both the inlet pipe 201 and the outlet pipe 301 communicating with the inner cavity of the housing 1, a pivot 6 rotatably mounted inside the housing 1, a counter 5 connected to one end of the pivot 6, and a plurality of spacers evenly arranged on the outer circumference of the pivot 6. A side plate 602 is fixedly installed between the two ends of two adjacent partition plates 601. The side plate 602 and the two adjacent partition plates 601 form an air collection chamber 603. An air bag 604 is fixedly installed on each partition plate 601. A main air pipe 7 is coaxially fixedly installed inside the pivot 6. An air pump 4 is fixedly installed on the side wall of the shell 1. The air pump 4 is connected to the main air pipe 7. An air equalization plate 8 is fixedly sleeved in the center of the pivot 6. The main air pipe 7 is connected to the air equalization plate 8. The air equalization plate 8 is connected to each air bag 604.

[0029] like Figure 2 and Figure 4 As shown, a liquid medium is introduced into the inner cavity of the shell 1 through the liquid inlet 302, and the liquid medium covers all the gas collecting chambers 603, forming a gas phase space 101 between the liquid surface of the liquid medium and the top cover 3. In this embodiment, the liquid medium has stable physical and chemical properties, is not easily volatile, and hardly dissolves gas.

[0030] Specifically, during measurement, the gas to be measured is introduced into the solution inside the cavity of the housing 1 through the inlet pipe 201, and bubbles are formed at the bottom of the cavity and gradually rise. The rising bubbles accumulate in the gas collecting chamber 603 until the buoyancy of the bubbles pushes the baffle 601 to start rotating. At this time, the bottom gas collecting chamber 603 will deflect synchronously in the direction of rotation until an opening appears in the gas collecting chamber 603 relative to the horizontal direction for the bubbles to escape (e.g., Figure 4 As shown in the figure, the bubbles will gradually disperse into the gas phase space 101 and be discharged through the gas outlet pipe 301. The other gas collection chamber 603 at the bottom will repeat the gas collection process, so that the gas collection chamber 603 realizes the process of collecting and releasing bubbles by rotating back and forth, thereby driving the pivot 6 to rotate continuously. During this process, the counter 5 is used to count the rotation process of the pivot 6, so that the gas flow rate can be accurately detected.

[0031] More specifically, by setting up the main air pipe 7, the air distribution plate 8, and the air bladder 604, the air pump 4 can uniformly circulate air into each air bladder 604 through the main air pipe 7 and the air distribution plate 8, so that the air pressure in each air bladder 604 remains uniform, thereby ensuring that the degree of expansion and contraction of each air bladder 604 is also consistent, that is, the buoyancy generated by each air bladder 604 is also consistent. When the air bladder 604 expands, its buoyancy increases, and therefore the amount of bubbles that need to be captured when the air collecting chamber 603 rotates decreases, that is, the amount of air collected in each air collecting chamber 603 decreases. Conversely, when the air bladder 604 contracts, its buoyancy decreases, and therefore the amount of bubbles that need to be captured when the air collecting chamber 603 rotates increases, that is, the amount of air collected in each air collecting chamber 603 increases. Thus, by controlling the degree of expansion and contraction of the air bladder 604, the amount of air collected when the air collecting chamber 603 floats can be controlled, thereby achieving resolution adjustment of gas flow detection.

[0032] It should be noted that the counter 5 in this embodiment can be a mechanical counter 5, which records the rotation process of the pivot 6 through a mechanical structure. Each trigger will push the digital wheel to rotate one increment, thereby achieving counting. Of course, the counter 5 can also be a sensor counter 5, which detects the rotation signal of the pivot 6 through electronic sensors (such as photoelectric, infrared, and Hall sensors), converts its motion process into an electrical signal, and achieves counting by analyzing and processing the electrical signal.

[0033] Since the liquid medium will inevitably drive the pivot 6 to rotate when the housing 1 is filled with liquid medium through the liquid inlet 302, the counter 5 needs to be calibrated before each detection.

[0034] like Figures 4-7 As shown, the air distribution plate 8 has several air inlet chambers 801 evenly arranged inside the air collection chamber 603, and each air bag 604 is connected to the corresponding air inlet chamber 801 through the bronchus pipe 6041. The end of the main air pipe 7 is evenly connected to the air inlet chamber 801, and several diversion sleeves 701 are evenly arranged at the end of the main air pipe 7, and each diversion sleeve 701 is connected to the corresponding air inlet chamber 801.

[0035] Specifically, by setting up the air distribution plate 8 and the diversion sleeve 701, when the airbag 604 expands, the gas in the main air pipe 7 will be evenly distributed to the corresponding air inlet chamber 801 through the diversion sleeve 701. The gas in the air inlet chamber 801 will then be introduced into the airbag 604 through the bronchus pipe 6041. Conversely, when the airbag 604 contracts, the gas in the airbag 604 will flow through the air inlet chamber 801 and the diversion sleeve 701 in sequence, and finally be introduced into the main air pipe 7 for discharge. This ensures that each airbag 604 can expand and contract synchronously, thereby ensuring that the gas collection volume of each air collection chamber 603 remains consistent.

[0036] like Figure 2 and Figure 8 As shown, the output end of the air pump 4 is connected to one end of the air pipe 401, and the other end of the air pipe 401 is fixedly provided with an air inlet connector 403. An regulating valve 402 is provided on the air pipe 401, and a rotating part 702 is provided at one end of the main air pipe 7. The rotating part 702 and the air inlet connector 403 are rotated and sealed together.

[0037] Specifically, the intake volume can be controlled by adjusting valve 402, which facilitates the control of the expansion or contraction process of each airbag 604. By setting up intake connector 403 and rotating part 702, the main air pipe 7 can still achieve a smooth intake or exhaust process while rotating with pivot 6, ensuring that the airbag 604 can expand and contract smoothly.

[0038] like Figure 8 As shown, the main air pipe 7 is provided with an enlarged diameter channel 703. The end of the enlarged diameter channel 703 near the rotating part 702 is a narrow diameter channel, and the end of the enlarged diameter channel 703 near the diverter sleeve 701 is a wide diameter channel.

[0039] Specifically, by setting up the enlarged-diameter channel 703, when the gas flows through the enlarged-diameter channel in the main gas pipe 7, a Venturi effect is formed, which slows down the gas velocity flowing into the wide-diameter channel. This allows the airflow to fully diffuse in the wide-diameter channel, which is conducive to forming a uniform flow field. This ensures that the airflow entering the distribution sleeve 701 can be evenly dispersed, guaranteeing the uniformity of gas distribution and thus helping to maintain consistent gas flow in each airbag 604.

[0040] like Figure 3 As shown, a fixing clip 605 is rotatably mounted on the partition 601. The fixing clip 605 is used to clamp and fix the airbag 604 on the partition 601.

[0041] Specifically, the retaining clip 605 provides a stable limiting effect on the airbag 604, ensuring it is firmly locked onto the partition 601 and preventing it from shaking and affecting the air collection process. When the airbag 604 needs to be replaced, simply flipping the retaining clip 605 releases the limiting effect on the airbag 604, making the operation simple and the disassembly and assembly convenient.

[0042] like Figure 2 and Figure 3 As shown, sealing rings 606 are provided at the connection points between the pivot 6 and the housing 1 at both ends. The pivot 6 forms a rotational sealing fit with the housing 1 through the sealing rings 606. The sealing rings 606 ensure good sealing performance between the pivot 6 and the housing 1, preventing leakage during the rotation of the pivot 6.

[0043] like Figure 2 and Figure 3As shown, the width of the partition 601 is consistent with the width of the inner cavity of the housing 1, and the air inlet pipe 201 is positioned directly in front of the center of the gas collecting chamber 603. The purpose of this arrangement is to ensure that the gas discharged from the air inlet pipe 201 is captured by the gas collecting chamber 603 to the maximum extent, preventing gas from overflowing from the gas collecting chamber 603, thereby ensuring the accuracy of gas flow detection.

[0044] The working principle of this invention is as follows: Figures 1-8 As shown, during measurement, a liquid medium is introduced into the phase housing 1 through the liquid inlet 302 until it submerges all gas collecting chambers 603, and the counter 5 is calibrated to zero. The gas to be measured is introduced into the solution inside the housing 1 through the gas inlet pipe 201, forming bubbles at the bottom of the housing 1 and gradually rising. The rising bubbles accumulate in the gas collecting chambers 603 until the buoyancy of the bubbles pushes the baffle 601 to start rotating. At this time, the bottom gas collecting chamber 603 will deflect synchronously in the direction of rotation until an opening appears in the gas collecting chamber 603 relative to the horizontal direction for the bubbles to escape. The bubbles will then gradually escape into the gas phase space 101 and be discharged through the gas outlet pipe 301. The other gas collecting chamber 603 at the bottom will repeat the gas collecting process, thus enabling the gas collecting chambers 603 to achieve a rotating and reciprocating process of bubble collection and release, which in turn drives the pivot 6 to rotate continuously. During this process, the counter 5 counts the rotation of the pivot 6, thereby accurately detecting the gas flow rate. The air pump 4 controls the synchronous expansion and contraction of each airbag 604 through the main air pipe 7 and the air distribution plate 8. When the airbag 604 expands, its buoyancy increases, so the amount of bubbles that need to be captured when the air collecting chamber 603 rotates decreases, that is, the amount of air collected in each air collecting chamber 603 decreases. Conversely, when the airbag 604 contracts, its buoyancy decreases, so the amount of bubbles that need to be captured when the air collecting chamber 603 rotates increases, that is, the amount of air collected in each air collecting chamber 603 increases. Thus, the amount of air collected when the air collecting chamber 603 floats can be controlled by controlling the degree of expansion and contraction of the airbag 604, thereby achieving the resolution adjustment of gas flow detection.

[0045] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A resolution-adjustable micro gas flow meter, comprising a shell (1), a base (2) is fixedly arranged at the bottom of the shell (1), characterized in that, The base (2) is provided with an air inlet pipe (201) penetrating through, the shell (1) is provided with a top cover (3) on the top, the top cover (3) is provided with an air outlet pipe (301) and a liquid inlet (302) respectively, the air inlet pipe (201) and the air outlet pipe (301) are communicated with the inner cavity of the shell (1), the shell (1) is rotatably provided with a pivot (6), one end of the pivot (6) is connected with a counter (5), the circumferential outer wall of the pivot (6) is uniformly provided with a plurality of partitions (601), the two ends between adjacent two partitions (601) are fixedly provided with a side plate (602), the side plate (602) and adjacent two partitions (601) form a gas collecting cavity (603), each partition (601) is fixedly provided with an air bag (604), the pivot (6) is coaxially fixedly provided with a main air pipe (7) in the inside, the shell (1) is fixedly provided with an air pump (4) on the side wall, the air pump (4) is communicated with the main air pipe (7), the pivot (6) is fixedly sleeved with a uniform gas disc (8) in the center, the main air pipe (7) is communicated with the uniform gas disc (8), the uniform gas disc (8) is communicated with each air bag (604).

2. A resolution adjustable micro gas flow meter according to claim 1, wherein, The inner part of the uniform gas disc (8) is uniformly provided with a plurality of air inlet chambers (801) corresponding to the gas collecting cavities (603), each air bag (604) is communicated with the corresponding air inlet chamber (801) through a branch air pipe (6041), the end of the main air pipe (7) is uniformly and correspondingly communicated with a plurality of shunt sleeves (701) provided with air inlet chambers (801), each shunt sleeve (701) is communicated with the corresponding air inlet chamber (801).

3. A resolution adjustable micro gas flow meter according to claim 2, wherein, The output end of the air pump (4) is communicated with one end of the air pipe (401), the other end of the air pipe (401) is fixedly provided with an air inlet connector (403), the air pipe (401) is provided with an adjusting valve (402), one end of the main air pipe (7) is provided with a rotating part (702), the rotating part (702) is rotatably and sealingly matched with the air inlet connector (403).

4. A micro gas flow meter with adjustable resolution according to claim 3, characterized in that, The main air pipe (7) is provided with an expanding hole (703) in the inside, one end of the expanding hole (703) close to the rotating part (702) is a narrow hole, the other end of the expanding hole (703) close to the shunt sleeve (701) is a wide hole.

5. A micro gas flow meter with adjustable resolution according to claim 1, wherein, The partition (601) is rotatably provided with a fixed clamp (605), the fixed clamp (605) is used for clamping and fixing the air bag (604) on the partition (601).

6. A micro gas flow meter with adjustable resolution according to claim 1, characterized in that, The connecting part of the pivot (6) and the shell (1) is provided with a sealing ring (606), the pivot (6) is rotatably and sealingly matched with the shell (1) through the sealing ring (606).

7. A micro gas flow meter with adjustable resolution according to claim 1, characterized in that, The inner cavity of the shell (1) is filled with liquid medium through the liquid inlet (302), and the liquid medium is above all the gas collecting cavities (603), and the liquid surface of the liquid medium and the top cover (3) form a gas phase space (101).

8. A micro gas flow meter with adjustable resolution according to claim 1, wherein, The width of the partition (601) is consistent with the width of the inner cavity of the shell (1), and the air inlet pipe (201) is arranged opposite to the center of the gas collecting cavity (603).

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