A gas volume measuring device and a measuring method

Abstract

The present application relates to the technical field of gas measurement, and provides a gas volume measuring device and a measuring method. The present application provides a gas volume measuring device and a measuring method to solve the technical problems of low efficiency and large error of the measuring result of the drainage method in the prior art. The gas volume measuring device for measuring the volume of gas in a gas bag comprises a first measuring container, a second measuring container, a conveying unit, an exhaust unit and a gas path switching unit. The first measuring container is communicated with the second measuring container. The conveying unit is communicated with the gas bag, the first measuring container and the second measuring container. The exhaust unit is connected with the first measuring container and the second measuring container. The gas path switching unit is connected with the conveying unit.

Description

Technical Field

[0001] The present invention relates to the technical field of gas measurement, and in particular to a gas volume measuring device and a measuring method. Background Art

[0002] Anaerobic digestion to produce biogas refers to the biochemical process in which organic waste (such as straw, manure, and kitchen waste) is decomposed and metabolized by microorganisms under anaerobic conditions to produce a combustible mixed gas (i.e., biogas) mainly composed of methane and carbon dioxide.

[0003] When it comes to anaerobic digestion biogas production, measuring biogas is a key step. A common method is the air bag collection method, which works by first collecting the generated biogas with an air bag and then calculating its volume using the water displacement method.

[0004] The displacement method for measuring gas volume is commonly used to collect gases that are insoluble or slightly soluble in water. The basic principle is to use the gas to displace an equal volume of water, and the volume of the generated gas can be measured by the change in the water level in a graduated cylinder or gas collecting bottle. In a specific application, the biogas collected in the air bag can be connected to a water-filled gas collecting bottle through a tube. The air bag is then squeezed, and the biogas in the air bag is discharged into the gas collecting bottle. Since the gas collecting bottle is connected to an empty graduated cylinder via another tube, as the air bag is squeezed, the corresponding volume of water in the gas collecting bottle flows into the graduated cylinder. The volume of the biogas can be measured by reading the graduations on the graduated cylinder.

[0005] However, the amount of biogas in the air bag is not fixed, that is, sometimes there is more biogas and sometimes there is less biogas; if there is too much biogas, for example, when all the water in the gas collecting bottle has been discharged into the measuring cylinder, but there is still biogas in the air bag, it is necessary to add water to the gas collecting bottle again, and then continue to squeeze the air bag. If all the water in the gas collecting bottle is discharged into the measuring cylinder again, it is necessary to add water to the gas collecting bottle again, and then continue to squeeze the air bag. This is repeated, which will not only make the measurement time-consuming and laborious, but also because the biogas in the air bag is discharged during the process of adding water to the gas collecting bottle again, the actual measured biogas volume is too small, and the measurement result has a large error. Summary of the Invention

[0006] The present invention provides a gas volume measuring device and a measuring method, which are used to solve the technical problems in the prior art of low efficiency and large error in measuring gas volume using a drainage method.

[0007] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] The present invention provides a gas volume measuring device for measuring the volume of gas in an air bag, comprising: a first measuring container, a second measuring container, a conveying unit, an exhaust unit and an air path switching unit; the first measuring container is connected to the second measuring container; the conveying unit is connected to the air bag, the first measuring container and the second measuring container; the exhaust unit connects the first measuring container and the second measuring container; the air path switching unit is connected to the conveying unit; wherein, when the first measuring container is filled with liquid, the air path switching unit can enable the air bag to be connected to the first measuring container through the conveying unit, and the exhaust unit can discharge the gas in the second measuring container so that the liquid in the first measuring container is conveyed to the second measuring container; when the liquid in the first measuring container is conveyed to fill the second measuring container, the air path switching unit can enable the air bag to be connected to the second measuring container through the conveying unit, and the exhaust unit can discharge the gas in the first measuring container so that the liquid in the second measuring container is conveyed to the first measuring container.

[0009] According to one embodiment of the present invention, the conveying unit includes a liquid supply pipe and an air supply mechanism; one end of the liquid supply pipe is connected to the first measuring container, and the other end of the liquid supply pipe is connected to the second measuring container; the air supply mechanism is connected to the air bag, the first measuring container and the second measuring container; the air path switching unit is connected to the air supply mechanism.

[0010] According to one embodiment of the present invention, the air supply mechanism includes a tee, a first pipe, a second pipe and a third pipe; the tee has a first port, a second port and a third port; one end of the first pipe is connected to the air bag, and the other end of the first pipe is connected to the first port; one end of the second pipe is connected to the second port, and the other end of the second pipe is connected to the first measuring container; one end of the third pipe is connected to the third port, and the other end of the third pipe is connected to the second measuring container; the air path switching unit connects the second pipe and the third pipe.

[0011] According to one embodiment of the present invention, the gas path switching unit includes a first control valve and a second control valve; the first control valve is arranged in the second pipeline; the second control valve is arranged in the third pipeline; wherein, when the first measuring container is filled with liquid, the first control valve is opened and the second control valve is closed; when the liquid in the first measuring container is transported to fill the second measuring container, the first control valve is closed and the second control valve is opened.

[0012] According to one embodiment of the present invention, the first measuring container has a first air hole and a first liquid hole; the first air hole and the first liquid hole are located at the top of the first measuring container; the second measuring container has a second air hole and a second liquid hole; the second air hole and the second liquid hole are located at the top of the second measuring container; one end of the liquid feeding tube extends to the bottom of the first measuring container through the first liquid hole, and the other end of the liquid feeding tube extends to the bottom of the second measuring container through the second liquid hole; the other end of the second pipe is connected to the first air hole; and the other end of the third pipe is connected to the second air hole.

[0013] According to one embodiment of the present invention, it also includes a first laser rangefinder and a second laser rangefinder; the first laser rangefinder is arranged on the top of the first measuring container and can detect the height of the liquid level in the first measuring container; the second laser rangefinder is arranged on the top of the second measuring container and can detect the height of the liquid level in the second measuring container.

[0014] According to one embodiment of the present invention, the first measuring container also has a first exhaust hole located at the top of the first measuring container; the second measuring container also has a second exhaust hole located at the top of the second measuring container; the exhaust unit includes a first exhaust valve and a second exhaust valve; the first exhaust valve is arranged at the first exhaust hole; the second exhaust valve is arranged at the second exhaust hole; wherein, when the first measuring container is filled with liquid, the first control valve and the second exhaust valve are opened, and the second control valve and the first exhaust valve are closed, so that the liquid in the first measuring container is transported to the second measuring container; when the liquid in the first measuring container is transported to fill the second measuring container, the first control valve and the second exhaust valve are closed, and the second control valve and the first exhaust valve are opened, so that the liquid in the second measuring container is transported to the first measuring container.

[0015] According to one embodiment of the present invention, it also includes a controller, a first gas flow meter, a second gas flow meter and a display screen; the controller is electrically connected to the first control valve, the second control valve, the first gas flow meter, the second gas flow meter, the first exhaust valve, the second exhaust valve, the first laser rangefinder, the second laser rangefinder and the display screen.

[0016] The present invention also provides a measurement method for a gas volume measuring device based on the above-mentioned embodiment, comprising the following steps: Step S1: Declare a total liquid level height variable and initialize the total liquid level height variable to 0; Step S2: Open the first control valve and the second exhaust valve, and close the second control valve and the first exhaust valve; Step S3: Obtain the flow value of the gas in the second pipeline; Step S4: If the flow value of the gas in the second pipeline is equal to zero, obtain the height of the liquid level of the second measuring container; Step S5: If the height of the liquid level of the second measuring container is lower than the highest value of the liquid level in the second measuring container, add the current value of the total liquid level height variable to the liquid level height of the second measuring container, and then reassign the result to the total liquid level height variable, and end the measurement.

[0017] According to one embodiment of the present invention, the following steps are also included: Step S6: If the height of the liquid level in the second measuring container is equal to the highest value of the liquid level in the second measuring container, the current value of the total liquid level height variable is added to the liquid level of the second measuring container, and the result is reassigned to the total liquid level height variable, and the second control valve and the first exhaust valve are opened, and the first control valve and the second exhaust valve are closed; Step S7: Obtain the flow value of the gas in the third pipeline; Step S8: If the flow value of the gas in the third pipeline is equal to zero, obtain the height of the liquid level in the first measuring container; Step S9: Add the current value of the total liquid level height variable to the liquid level of the first measuring container, and then reassign the result to the total liquid level height variable; Step S10: If the height of the liquid level in the first measuring container is lower than the highest value of the liquid level in the first measuring container, end the measurement; Step S11: If the height of the liquid level in the first measuring container is equal to the highest value of the liquid level in the first measuring container, return to step S2 and execute the loop.

[0018] The characteristics and advantages of the gas volume measuring device and method of the present invention are:

[0019] The first and second measuring containers hold liquids. A gas path switching unit allows the gas in the air bag to be discharged into one of the measuring containers. This allows the first measuring container to continuously receive gas from the air bag while the other container receives liquid from the previous container, ensuring a continuous measurement process. The transfer unit is responsible for transferring gas between the air bag, the first measuring container, and the second measuring container, ensuring smooth entry of gas into either the first or second measuring container for volume measurement. It also transfers liquid between the first and second measuring containers. The exhaust unit is used to discharge gas from the measuring containers. The gas path switching unit switches the gas path direction as needed, allowing gas in the air bag to enter either the first or second measuring container, thus achieving continuous measurement. This design allows one measuring container to fill with liquid when one container is empty, similar to a seesaw. This eliminates the repeated addition of water required by traditional displacement methods, significantly improving measurement efficiency, reducing steps and time, and minimizing errors caused by human error. In terms of working principle, the first measuring container is first filled with liquid, and then the gas in the air bag is guided into the first measuring container through the air path switching unit, pushing the liquid into the second measuring container. The second measuring container can measure the volume of the liquid inside it, thereby determining the volume of gas discharged from the air bag; when the liquid in the first measuring container is completely transferred, switch to the second measuring container and repeat the above process, thereby realizing accurate measurement of different gas volumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 1 is a schematic structural diagram of a gas volume measuring device according to the present invention, in which gas begins to flow into a first measuring container;

[0022] Figure 2 1 is a schematic structural diagram of a gas volume measuring device according to the present invention, showing a portion of gas flowing into a first measuring container;

[0023] Figure 3 1 is a schematic structural diagram of a gas volume measuring device according to the present invention, in which it is shown that the gas has completely pressed out the liquid in the first measuring container;

[0024] Figure 41 is a schematic structural diagram of a gas volume measuring device according to the present invention, in which gas begins to flow into the second measuring container;

[0025] Figure 5 1 is a schematic structural diagram of a gas volume measuring device according to the present invention, showing a portion of gas flowing into a second measuring container;

[0026] Figure 6 1 is a schematic structural diagram of a gas volume measuring device according to the present invention, in which it is shown that the gas has completely pressed out the liquid in the second measuring container;

[0027] Figure 7 is a control schematic diagram of the controller of the present invention;

[0028] Figure 8 It is a schematic flow chart of the measuring method of the present invention.

[0029] Reference numerals:

[0030] 100. Air bag; 1. First measuring container; 2. Second measuring container; 3. Delivery unit; 31. Liquid delivery pipe; 32. Air delivery mechanism; 321. Tee; 322. First pipeline; 323. Second pipeline; 324. Third pipeline; 4. Exhaust unit; 41. First exhaust valve; 42. Second exhaust valve; 5. Gas path switching unit; 51. First control valve; 52. Second control valve; 6. First laser rangefinder; 7. Second laser rangefinder; 8. Controller; 9. First gas flowmeter; 10. Second gas flowmeter. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that, in the description of the present invention, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of the present invention, unless otherwise specified, "at least one" means one or more, and "a plurality" means two or more. The use of the term "may" herein is intended to indicate that any attribute described in "may" is optional.

[0033] In this embodiment, unless otherwise specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0034] Implementation Method

[0035] like Figures 1 to 7 As shown, the present invention provides a gas volume measuring device for measuring the volume of gas in an air bag 100, comprising: a first measuring container 1, a second measuring container 2, a conveying unit 3, an exhaust unit 4 and a gas path switching unit 5; the first measuring container 1 is connected to the second measuring container 2; the conveying unit 3 is connected to the air bag 100, the first measuring container 1 and the second measuring container 2; the exhaust unit 4 is connected to the first measuring container 1 and the second measuring container 2; the gas path switching unit 5 is connected to the conveying unit 3; wherein, when the first measuring container 1 is filled with liquid, the gas path switching unit 5 can enable the air bag 100 to be connected to the first measuring container 1 through the conveying unit 3, and the exhaust unit 4 can discharge the gas in the second measuring container 2 so that the liquid in the first measuring container 1 is transported to the second measuring container 2; when the liquid in the first measuring container 1 is transported to fill the second measuring container 2, the gas path switching unit 5 can enable the air bag 100 to be connected to the second measuring container 2 through the conveying unit 3, and the exhaust unit 4 can discharge the gas in the first measuring container 1 so that the liquid in the second measuring container 2 is transported to the first measuring container 1.

[0036] In specific implementation, the first measuring container 1 and the second measuring container 2 are used to hold liquid, and the gas in the air bag 100 is discharged into one of the measuring containers through the gas path switching unit 5, so that when measuring the gas volume, the measuring container can continuously receive gas from the air bag 100, while the other measuring container takes over the liquid discharged from the previous measuring container, ensuring the continuity of the measurement process. The conveying unit 3 is responsible for transmitting gas between the air bag 100, the first measuring container 1, and the second measuring container 2, ensuring that the gas can smoothly enter the first measuring container 1 or the second measuring container 2 for volume measurement; and is also responsible for transmitting liquid between the first measuring container 1 and the second measuring container 2. The exhaust unit 4 is used to discharge the gas in the measuring container. The gas path switching unit 5 can switch the gas path direction as needed, so that the gas in the air bag 100 can enter the first measuring container 1 or the second measuring container 2, thereby achieving continuous measurement. This design allows one measuring container to fill with liquid when one is empty, while the other fills with liquid, like a seesaw. This eliminates the repeated addition of water required in traditional drainage methods, significantly improving measurement efficiency, reducing operational steps and time, and minimizing errors caused by human error. The system works by first filling the first measuring container 1 with liquid. Then, the gas in the air bag 100 is directed into the first measuring container 1 via the gas path switching unit 5, pushing the liquid into the second measuring container 2. The second measuring container 2 measures the volume of the liquid within it, thereby determining the volume of gas discharged from the air bag. Once the liquid in the first measuring container 1 is completely transferred, the process is repeated in the second measuring container 2, achieving precise measurement of different gas volumes.

[0037] In this embodiment, the air bag 100 can be existing technology; the first measuring container 1 and the second measuring container 2 can be measuring cylinders of the same size, with scales on the measuring cylinders, and the measuring personnel can directly know the volume of the liquid therein by reading the scales on the measuring cylinders; the liquid can be water.

[0038] According to one embodiment of the present invention, the conveying unit 3 includes a liquid supply pipe 31 and an air supply mechanism 32; one end of the liquid supply pipe 31 is connected to the first measuring container 1, and the other end of the liquid supply pipe 31 is connected to the second measuring container 2; the air supply mechanism 32 connects the air bag 100, the first measuring container 1 and the first measuring container 1; the air path switching unit 5 is connected to the air supply mechanism 32.

[0039] In specific implementation, the liquid delivery tube 31 connects the first measuring container 1 and the second measuring container 2. Its function is to ensure that liquid can be smoothly transferred between the first measuring container 1 and the second measuring container 2. The coordination between the liquid delivery tube 31, the first measuring container 1 and the second measuring container 2 can indicate whether there is still gas in the air bag 100. For example, if liquid flows between the first measuring container 1 and the second measuring container 2, it means that there is still gas in the air bag 100. The gas delivery mechanism 32 is responsible for accurately delivering the gas in the air bag 100 to the first measuring container 1 or the second measuring container 2. The gas path switching unit 5 is connected to the gas delivery mechanism 32. By controlling the flow direction of gas, the gas can be introduced into the first measuring container 1 or the second measuring container 2 as needed, achieving a continuous and uninterrupted measurement process. For example, if the first measuring container 1 is full of liquid, the gas delivery mechanism 32 will deliver the gas in the air bag 100 to the first measuring container 1.

[0040] In this embodiment, the liquid delivery tube 31 may include three sections, one of which is located in the first measuring container 1 , another is located in the second measuring container 2 , and the remaining section is located between the first measuring container 1 and the second measuring container 2 .

[0041] According to one embodiment of the present invention, the air supply mechanism 32 includes a tee 321, a first pipe 322, a second pipe 323 and a third pipe 324; the tee 321 has a first port, a second port and a third port; one end of the first pipe 322 is connected to the air bag 100, and the other end of the first pipe 322 is connected to the first port; one end of the second pipe 323 is connected to the second port, and the other end of the second pipe 323 is connected to the first measuring container 1; one end of the third pipe 324 is connected to the third port, and the other end of the third pipe 324 is connected to the second measuring container 2; the air path switching unit 5 connects the second pipe 323 and the third pipe 324.

[0042] In specific implementations, the gas path switching unit 5 controls the opening and closing of the second and third conduits 323 and 324 to determine whether the gas enters the first or second measuring container 1 or 2. The operating principle is that the gas path switching unit 5 selectively opens or closes the second and third conduits 323 and 324, allowing the gas in the air bag 100 to enter the first or second measuring container 1 or 2. This, in turn, propels the liquid from one measuring container to the other, and the gas volume is determined by monitoring the amount of liquid transferred. This entire process requires no manual intervention, such as adding water or adjusting the volume, significantly reducing errors and improving measurement convenience and accuracy.

[0043] According to one embodiment of the present invention, the gas path switching unit 5 includes a first control valve 51 and a second control valve 52; the first control valve 51 is arranged in the second pipeline 323; the second control valve 52 is arranged in the third pipeline 324; wherein, when the first measuring container 1 is filled with liquid, the first control valve 51 is opened and the second control valve 52 is closed; when the liquid in the first measuring container 1 is transported to fill the second measuring container 2, the first control valve 51 is closed and the second control valve 52 is opened.

[0044] In a specific implementation, the first control valve 51 is disposed in the second pipe 323 between the connecting tee 321 and the first measuring container 1, and is responsible for controlling whether gas can enter the first measuring container 1. The second control valve 52 is located in the third pipe 324 connecting the connecting tee 321 and the second measuring container 2, and is responsible for controlling whether gas can enter the second measuring container 2.

[0045] In this embodiment, the first control valve 51 and the second control valve 52 may be conventional valves.

[0046] According to one embodiment of the present invention, the first measuring container 1 has a first air hole and a first liquid hole; the first air hole and the first liquid hole are located at the top of the first measuring container 1; the second measuring container 2 has a second air hole and a second liquid hole; the second air hole and the second liquid hole are located at the top of the second measuring container 2; one end of the liquid feeding tube 31 extends to the bottom of the first measuring container 1 through the first liquid hole, and the other end of the liquid feeding tube 31 extends to the bottom of the second measuring container 2 through the second liquid hole; the other end of the second pipe 323 is connected to the first air hole; the other end of the third pipe 324 is connected to the second air hole.

[0047] During specific implementation, the first air hole and the second air hole are mainly used to connect the air supply mechanism 32 to ensure that the gas can smoothly enter the corresponding measuring container; while the first liquid hole and the second liquid hole allow the liquid supply pipe 31 to extend to the bottom of the measuring container, thereby effectively transferring the liquid. Specifically, one end of the liquid supply pipe 31 extends into the bottom of the first measuring container 1 through the first liquid hole, and the other end extends into the bottom of the second measuring container 2 through the second liquid hole. This design ensures that the liquid can flow smoothly from the bottom of one measuring container to the bottom of another measuring container, and does not cause the gas in the measuring container that transfers the liquid to flow into the measuring container where the transferred liquid is located, thereby reducing errors. The second pipe 323 is connected to the first air hole so that the gas can be introduced into the first measuring container 1; the third pipe 324 is connected to the second air hole so that the gas can be introduced into the second measuring container 2. This design not only optimizes the separation and transmission of gas and liquid in the measuring container, but also achieves accurate measurement of the gas volume through precise control.

[0048] According to one embodiment of the present invention, it also includes a first laser rangefinder 6 and a second laser rangefinder 7; the first laser rangefinder 6 is arranged on the top of the first measuring container 1 and can detect the height of the liquid level in the first measuring container 1; the second laser rangefinder 7 is arranged on the top of the second measuring container 2 and can detect the height of the liquid level in the second measuring container 2.

[0049] In practice, a first laser rangefinder 6 is positioned atop the first measuring container 1, enabling real-time monitoring of changes in the liquid level within the first container. Similarly, a second laser rangefinder 7 is positioned atop the second measuring container 2, monitoring the liquid level within the second container 2. This design not only enables automatic and accurate acquisition of liquid level change data, but also effectively reduces the errors and inconvenience associated with traditional visual level reading, improving measurement accuracy and efficiency.

[0050] In this embodiment, the first laser rangefinder 6 and the second laser rangefinder 7 may be existing technologies.

[0051] According to one embodiment of the present invention, the first measuring container 1 further has a first exhaust hole located at the top of the first measuring container 1; the second measuring container 2 further has a second exhaust hole located at the top of the second measuring container 2; the exhaust unit 4 includes a first exhaust valve 41 and a second exhaust valve 42; the first exhaust valve 41 is arranged at the first exhaust hole; the second exhaust valve 42 is arranged at the second exhaust hole; wherein, when the first measuring container 1 is filled with liquid, the first control valve 51 and the second exhaust valve 42 are opened, and the second control valve 52 and the first exhaust valve 41 are closed, so that the liquid in the first measuring container 1 is transported to the second measuring container 2; when the liquid in the first measuring container 1 is transported to fill the second measuring container 2, the first control valve 51 and the second exhaust valve 42 are closed, and the second control valve 52 and the first exhaust valve 41 are opened, so that the liquid in the second measuring container 2 is transported to the first measuring container 1.

[0052] In practice, when gas flows from the air bag 100 through the conveying unit 3 and enters a measuring container (e.g., the first measuring container 1 or the second measuring container 2), the existing air or gas inside the measuring container needs to have an outlet to escape. Otherwise, the newly entered gas will not be able to effectively fill the measuring container because the internal pressure of the measuring container will prevent further gas from flowing in. Therefore, vent holes (a first vent hole and a second vent hole) are provided at the top of each measuring container to provide a path for the gas inside the measuring container to escape.

[0053] In this embodiment, the first exhaust valve 41 and the second exhaust valve 42 may be conventional valves.

[0054] According to one embodiment of the present invention, it also includes a controller 8, a first gas flow meter 9, a second gas flow meter 10 and a display screen; the controller 8 is electrically connected to the first control valve 51, the second control valve 52, the first gas flow meter 9, the second gas flow meter 10, the first exhaust valve 41, the second exhaust valve 42, the first laser rangefinder 6, the second laser rangefinder 7 and the display screen.

[0055] During specific implementation, the controller 8 is responsible for receiving data from various sensors (such as the first gas flow meter 9, the second gas flow meter 10, the first laser rangefinder 6, and the second laser rangefinder 7), and controlling the actions of various actuators (such as the first control valve 51, the second control valve 52, the first exhaust valve 41, and the second exhaust valve 42) according to preset logic.

[0056] In this embodiment, the controller 8, the first gas flow meter 9, the second gas flow meter 10 and the display screen may be existing technologies.

[0057] According to one embodiment of the present invention, a one-way valve is further included, which is disposed in the first pipe 322 and located at one end of the first pipe 322 connected to the air bag 100 , so as to connect the air bag 100 to the first pipe 322 .

[0058] In specific implementation, a one-way valve is added to the gas volume measuring device. The one-way valve is arranged in the first pipe 322 at one end close to the air bag 100. Its function is to ensure that the gas can only flow from the air bag 100 to the inside of the measuring device without backflow.

[0059] In this embodiment, the one-way valve may be a conventional valve.

[0060] Implementation Method

[0061] like Figures 1 to 8 As shown, the present invention also provides a measurement method of the gas volume measuring device based on the above embodiment, comprising the following steps:

[0062] Step S1: declare a total liquid level variable and initialize the total liquid level variable to 0.

[0063] In this embodiment, using the Python programming language as an example, a variable named total can be declared to store the total liquid level value and initialized to 0 (i.e., total = 0). Here, the total liquid level variable is used to store the height of all liquid displacements during the measurement process. Ultimately, the total volume of the gas in the air bag 100 is calculated based on the value of the total liquid level variable (because one height corresponds to one volume). The total liquid level value and the corresponding volume can then be displayed on the display.

[0064] Step S2: Figure 1As shown, the first control valve 51 and the second exhaust valve 42 are opened, and the second control valve 52 and the first exhaust valve 41 are closed.

[0065] In this embodiment, the valve operations can be controlled by the controller 8: the first control valve 51 and the second exhaust valve 42 are opened, while the second control valve 52 and the first exhaust valve 41 are closed. This step ensures that gas can smoothly enter the first measuring container 1 from the gas bag 100, while allowing the gas in the second measuring container 2 to be discharged, preparing for liquid transfer.

[0066] Step S3: Obtain the flow value of the gas in the second pipeline 323.

[0067] In this embodiment, the flow data of the gas in the second pipe 323 can be detected by the first gas flow meter 9 and the data can be transmitted to the controller 8. In this way, the controller 8 can obtain the flow value of the gas in the second pipe 323.

[0068] Step S4: If the flow rate of the gas in the second pipe 323 is equal to zero, the height of the liquid level in the second measuring container 2 is obtained.

[0069] In this embodiment, when the gas flow rate in the second pipe 323 is detected to be zero (meaning that gas has stopped flowing into the first measuring container 1), the second laser rangefinder detects the height of the liquid level in the second measuring container 2 and transmits this data to the controller 8. This allows the controller 8 to obtain the height of the liquid level in the second measuring container 2. It will be appreciated that the measurement values ​​of the first gas flowmeter 9 and the second gas flowmeter serve to determine the truth of a condition. For example, a measurement value of 1 or 5 ultimately has the same effect, indicating that the condition is true. Therefore, even if the measurement value is inaccurate, it will not affect the volume measurement result.

[0070] Step S5: If the height of the liquid level in the second measuring container 2 is lower than the highest value of the liquid level in the second measuring container 2, the current value of the total liquid level height variable is added to the liquid level height of the second measuring container 2, and then the result is reassigned to the total liquid level height variable, and the measurement is ended.

[0071] In this embodiment, when the gas flow rate in second conduit 323 is detected to be zero (meaning that gas has stopped flowing into first measuring container 1), two different situations need to be further examined. (1) If the amount of gas in air bag 100 is low, all of the gas in air bag 100 has been discharged into first measuring container 1, and the liquid in first measuring container 1 has not been completely drained. As a result, the liquid level in second measuring container 2 is lower than the highest liquid level in second measuring container 2. In this case, the liquid level in second measuring container 2 is measured by second laser rangefinder 7, and the volume corresponding to the change in liquid level is calculated, thereby determining the total volume of gas in air bag 100. In this case, the measurement process can be terminated directly because all of the gas has been transferred and its volume has been accurately calculated. (2) If there is a large amount of gas in the air bag 100: If the amount of gas in the air bag 100 is large enough to completely discharge the liquid in the first measuring container 1 into the second measuring container 2, there may still be residual gas in the air bag 100 that has not been transferred. At this time, the height of the liquid level in the second measuring container 2 is equal to the highest value of the liquid level in the second measuring container 2.

[0072] According to one embodiment of the present invention, the following steps are further included:

[0073] Step S6: If the height of the liquid level in the second measuring container 2 is equal to the highest value of the liquid level in the second measuring container 2, the current value of the total liquid level variable is added to the liquid level of the second measuring container 2, and the result is reassigned to the total liquid level variable.

[0074] In this embodiment, the judgment condition in step S6 can determine whether the air bag 100 is either completely empty or still contains gas. However, the second measuring container 2 is full, and the remaining gas in the air bag 100 cannot be further measured. Therefore, the current liquid level of the second measuring container 2 can be recorded (i.e., total = total + current liquid level of the second measuring container 2). This is like a patient in a hospital requiring continuous injections. After completing one injection, the patient needs to record the number of injections. The patient then continues with the next injection, recording each injection until all injections are completed. This allows the patient to know how many injections they have received.

[0075] It can be understood that in "total = total + the current liquid level of the second measuring container 2", "=" represents assignment, such as 3 = 2 (the value of total on the right) + 1. The result of adding 2 and 1 is 3, which is placed in the variable total on the left. Total can be simply understood as a container for data, that is, a variable.

[0076] Step S7: Figure 4As shown, the second control valve 52 and the first exhaust valve 41 are opened, and the first control valve 51 and the second exhaust valve 42 are closed.

[0077] In this embodiment, the second control valve 52 and the first exhaust valve 41 are opened, and the first control valve 51 and the second exhaust valve 42 are closed, so that gas can flow from the air bag 100 to the second measuring container 2, while allowing the gas in the first measuring container 1 to be discharged.

[0078] Step S8: Obtain the flow rate value of the gas in the third pipeline 324.

[0079] In this embodiment, the flow data of the gas in the third pipe 324 can be detected by the second gas flow meter 10 and the data can be transmitted to the controller 8. In this way, the controller 8 can obtain the flow value of the gas in the third pipe 324.

[0080] Step S9: If the flow rate of the gas in the third pipe 324 is equal to zero, the height of the liquid level in the first measuring container 1 is obtained.

[0081] In this embodiment, when the gas flow rate in the third pipe 324 is detected to be zero (which means that the gas has stopped flowing into the second measuring container 2), the height data of the liquid level in the first measuring container 1 can be detected by the first laser rangefinder and transmitted to the controller 8. In this way, the controller 8 can obtain the height of the liquid level in the first measuring container 1.

[0082] Step S10: Add the current value of the total liquid level variable to the liquid level of the first measuring container 1, and then reassign the result to the total liquid level variable.

[0083] In this embodiment, the function of step S10 is to update the total liquid level value, which is like the patient being injected with an injection again and the dosage of the injection being recorded.

[0084] Step S11: If the height of the liquid level in the first measuring container 1 is lower than the highest value of the liquid level in the first measuring container 1, the measurement is ended.

[0085] In this embodiment, if the height of the liquid level in the first measuring container 1 is lower than the highest value of the liquid level in the first measuring container 1 , it means that there is no gas in the air bag 100 . In this case, the measurement process can be directly terminated.

[0086] Step S12: If the height of the liquid level in the first measuring container 1 is equal to the highest value of the liquid level in the first measuring container 1, the process returns to step S2 for loop execution.

[0087] In this embodiment, if the height of the liquid level in the first measuring container 1 is equal to the highest value of the liquid level in the first measuring container 1, it means that there is still gas in the air bag 100, that is, the measured gas is relatively large. It is like the patient's condition is serious and two injections are not enough. The injection needs to continue until there is no more injection.

[0088] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A method for measuring gas volume using a gas volume measuring device, characterized in that: The gas volume measuring device includes a first measuring container and a second measuring container; One end of the liquid delivery tube is connected to the first measuring container, and the other end is connected to the second measuring container; The tee has a first port, a second port and a third port; One end of the first pipe is connected to the air bag, and the other end is connected to the first port; One end of the second pipe is connected to the second port, and the other end is connected to the first measuring container; One end of the third pipe is connected to the third port, and the other end is connected to the second measuring container; A first control valve is disposed in the second pipeline; A second control valve is disposed in the third pipeline; The first exhaust valve is arranged at the first exhaust hole on the top of the first measuring container; The second exhaust valve is arranged at the second exhaust hole on the top of the second measuring container; The controller is electrically connected to the first control valve, the second control valve, the first exhaust valve and the second exhaust valve; The measurement method includes the following steps: S1: declare a total liquid level variable and initialize it to 0; S2: Open the first control valve and the second exhaust valve, and close the second control valve and the first exhaust valve; S3: Obtain the flow rate of the gas in the second pipeline; S4: If the flow rate of the gas in the second pipeline is equal to zero, obtaining the height of the liquid level in the second measuring container; S5: If the height of the liquid level in the second measuring container is lower than the highest value of the liquid level in the second measuring container, the current value of the total liquid level variable is added to the liquid level of the second measuring container, and the result is reassigned to the total liquid level variable, and the measurement is ended; S6: If the height of the liquid level in the second measuring container is equal to the highest value of the liquid level in the second measuring container, then add the current value of the total liquid level variable to the liquid level of the second measuring container, and then reassign the result to the total liquid level variable, and open the second control valve and the first exhaust valve, and close the first control valve and the second exhaust valve; S7: Obtaining the flow rate of the gas in the third pipeline; S8: If the flow rate value of the gas in the third pipeline is equal to zero, obtaining the height of the liquid level in the first measuring container; S9: adding the current value of the total liquid level variable to the liquid level of the first measuring container, and then reassigning the result to the total liquid level variable; S10: If the height of the liquid level in the first measuring container is lower than the highest value of the liquid level in the first measuring container, then end the measurement; S11: If the height of the liquid level in the first measuring container is equal to the highest value of the liquid level in the first measuring container, return to S2 for loop execution.

2. The measuring method of the gas volume measuring device according to claim 1, characterized in that: The gas volume measuring device further includes a first laser rangefinder and a second laser rangefinder; The first laser rangefinder is arranged on the top of the first measuring container and can detect the height of the liquid level in the first measuring container; The second laser rangefinder is arranged on the top of the second measuring container and can detect the height of the liquid level in the second measuring container.

3. The measuring method of the gas volume measuring device according to claim 1, characterized in that: The gas volume measuring device also includes a first gas flow meter and a second gas flow meter. The controller is electrically connected to the first gas flow meter and the second gas flow meter. The first gas flow meter is used to detect the flow data of the gas in the second pipeline, and the second gas flow meter is used to detect the flow data of the gas in the third pipeline.

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