Gas volume measuring device and measuring method

Abstract

The invention relates to the technical field of gas measurement, and provides a gas volume measuring device and method. The invention provides a gas volume measuring device and a gas volume measuring method, which are used for solving the technical problems of low gas volume measuring efficiency and large measuring result error of a drainage method in the prior art. The gas volume measuring device is used for measuring the volume of gas in a gas bag and 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 air 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; and 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 particularly relates to a gas volume measurement device and a measurement method. Background Art

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

[0003] In the aspect of anaerobic digestion to produce biogas, the measurement of biogas is a key link. Among them, the commonly used method is to measure the volume by the gas bag collection method. Its working principle is: first, use a gas bag to collect the generated biogas, and then use the water displacement method to calculate the volume of biogas.

[0004] The water displacement method for measuring the volume of gas is often used to collect gases that are insoluble or slightly soluble in water. Its basic principle is: utilize the gas to displace an equal volume of water, and measure the volume of the generated gas through the change in the water level in a graduated cylinder or a gas collecting bottle. In specific applications, the biogas collected by the gas bag can be connected to a gas collecting bottle filled with water through a conduit, and then the gas bag is squeezed. The biogas in the gas bag will be discharged into the gas collecting bottle. Since the gas collecting bottle is connected to an empty graduated cylinder through another conduit, as the gas bag is squeezed, the corresponding volume of water in the gas collecting bottle will flow into the graduated cylinder, and by reading the scale of the graduated cylinder, the volume of biogas can be measured.

[0005] However, since the amount of biogas in the gas bag is not fixed, that is, sometimes there is more biogas and sometimes less biogas; if there is too much biogas, for example, when all the water in the gas collecting bottle has been drained into the graduated cylinder and there is still biogas in the gas bag, water needs to be added to the gas collecting bottle again, and then the gas bag is squeezed again. If all the water in the gas collecting bottle is drained into the graduated cylinder again, water needs to be added to the gas collecting bottle again and then the gas bag is squeezed again. Repeating this way will not only cause time-consuming and laborious measurement, but also lead to less actual measured biogas volume due to the external discharge of biogas in the gas bag during the process of adding water to the gas collecting bottle again, resulting in a large measurement error. Summary of the Invention

[0006] The present invention provides a gas volume measurement device and a measurement method to solve the technical problems of low efficiency and large measurement error in the prior art when measuring the gas volume by the water displacement method.

[0007] The above object of the present invention can be achieved by the following technical solutions: 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 a gas path switching unit; the first measuring container is communicated with the second measuring container; the conveying unit is communicated with the air bag, the first measuring container and the second measuring container; the exhaust unit is connected to the first measuring container and the second measuring container; the gas path switching unit is connected to the conveying unit; wherein, when the first measuring container is filled with liquid, the gas path switching unit can enable the air bag to be communicated with 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 gas path switching unit can enable the air bag to be communicated with 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.

[0008] According to an embodiment of the present invention, the conveying unit includes a liquid delivery pipe and a gas delivery mechanism; one end of the liquid delivery pipe is communicated with the first measuring container, and the other end of the liquid delivery pipe is communicated with the second measuring container; the gas delivery mechanism is communicated with the air bag, the first measuring container and the first measuring container; the gas path switching unit is connected to the gas delivery mechanism.

[0009] According to an embodiment of the present invention, the gas delivery mechanism includes a three-way joint, a first pipe, a second pipe and a third pipe; the three-way joint has a first port, a second port and a third port; one end of the first pipe is communicated with the air bag, and the other end of the first pipe is communicated with the first port; one end of the second pipe is communicated with the second port, and the other end of the second pipe is communicated with the first measuring container; one end of the third pipe is communicated with the third port, and the other end of the third pipe is communicated with the second measuring container; the gas path switching unit is connected to the second pipe and the third pipe.

[0010] According to an 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 pipe; the second control valve is arranged in the third pipe; 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 conveyed to fill the second measuring container, the first control valve is closed and the second control valve is opened.

[0011] According to an 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 delivery pipe extends into the bottom of the first measuring container through the first liquid hole, and the other end of the liquid delivery pipe extends into the bottom of the second measuring container through the second liquid hole; the other end of the second pipe communicates with the first air hole; the other end of the third pipe communicates with the second air hole.

[0012] According to an embodiment of the present invention, it further includes a first laser rangefinder and a second laser rangefinder; the first laser rangefinder is arranged at 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 at the top of the second measuring container and can detect the height of the liquid level in the second measuring container.

[0013] According to an embodiment of the present invention, the first measuring container further has a first exhaust hole located at the top of the first measuring container; the second measuring container further 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 conveyed to the second measuring container. When the liquid in the first measuring container is conveyed 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 conveyed to the first measuring container.

[0014] According to an embodiment of the present invention, it further includes a controller, a first gas flowmeter, a second gas flowmeter and a display screen; the controller is electrically connected to the first control valve, the second control valve, the first gas flowmeter, the second gas flowmeter, the first exhaust valve, the second exhaust valve, the first laser rangefinder, the second laser rangefinder and the display screen.

[0015] The present invention also provides a measurement method for a gas volume measurement device based on the above-described embodiment, including 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 rate value of the gas in the second pipeline; Step S4: If the flow rate value of the gas in the second pipeline is equal to zero, obtain the height of the liquid level in the second measurement container; Step S5: If the height of the liquid level in the second measurement container is lower than the maximum liquid level value in the second measurement container, add the current value of the total liquid level height variable to the height of the liquid level in the second measurement container, then reassign the result to the total liquid level height variable, and end the measurement.

[0016] According to an embodiment of the present invention, the method further includes the following steps: Step S6: If the height of the liquid level in the second measurement container is equal to the maximum liquid level value in the second measurement container, add the current value of the total liquid level height variable to the height of the liquid level in the second measurement container, then reassign the result to the total liquid level height variable, and open the second control valve and the first exhaust valve, and close the first control valve and the second exhaust valve; Step S7: Obtain the flow rate value of the gas in the third pipeline; Step S8: If the flow rate value of the gas in the third pipeline is equal to zero, obtain the height of the liquid level in the first measurement container; Step S9: Add the current value of the total liquid level height variable to the height of the liquid level in the first measurement container, then reassign the result to the total liquid level height variable; Step S10: If the height of the liquid level in the first measurement container is lower than the maximum liquid level value in the first measurement container, end the measurement; Step S11: If the height of the liquid level in the first measurement container is equal to the maximum liquid level value in the first measurement container, return to Step S2 and execute the loop.

[0017] The characteristics and advantages of a gas volume measurement device and a measurement method of the present invention are: The first measuring container and the second measuring container are used to contain liquid, and the gas in the air bag is discharged into one of the measuring containers through the gas path switching unit, so that when measuring the gas volume, the measuring container can continuously receive the gas from the air bag, while the other measuring container receives the liquid discharged from the previous measuring container, ensuring the continuity of the measurement process. The conveying unit is responsible for transmitting gas between the air bag, the first measuring container and the second measuring container, ensuring that the gas can smoothly enter the first measuring container or the second measuring container for volume measurement; and it is also responsible for transmitting liquid between the first measuring container and the second measuring container. The exhaust unit is used to discharge the gas in the measuring container. The gas path switching unit can switch the gas path direction as needed, so that the gas in the air bag can enter the first measuring container or the second measuring container, thereby realizing continuous measurement. Through this design, when one measuring container is empty of liquid, the other measuring container will be filled with liquid, like a seesaw, avoiding the operation of repeatedly adding water in the traditional drainage method, greatly improving the measurement efficiency, reducing the operation steps and time consumption, and reducing the errors caused by human factors. 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 gas path switching unit, pushing the liquid into the second measuring container. The second measuring container can measure the volume of the liquid therein, 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 achieving accurate measurement of different volumes of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0019] Figure 1 is a schematic structural diagram of a gas volume measuring device of the present invention, in which gas begins to flow into a first measuring container; Figure 2 is a schematic structural diagram of a gas volume measuring device of the present invention, in which gas partially flows into a first measuring container; Figure 3 is a schematic diagram of the structure of a gas volume measuring device of the present invention, which shows that the gas has pressed out all the liquid in the first measuring container; Figure 4 is a schematic structural diagram of a gas volume measuring device of the present invention, in which the gas begins to flow into the second measuring container; Figure 5It is a schematic structural diagram of a gas volume measuring device of the present invention, in which it is shown that a part of the gas flows into the second measuring container; Figure 6 It is a schematic structural diagram of a gas volume measuring device of the present invention, in which it is shown that the gas has completely pressed out the liquid in the second measuring container; Figure 7 It is a schematic control diagram of the controller of the present invention; Figure 8 It is a schematic flow diagram of the measuring method of the present invention.

[0020] Reference numerals: 100, air bag; 1, first measuring container; 2, second measuring container; 3, conveying unit; 31, liquid delivery pipe; 32, gas delivery mechanism; 321, three-way joint; 322, first pipe; 323, second pipe; 324, third pipe; 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 implementation manners

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "at least one" is one or more, and the meaning of "multiple" is two or more. Here, by using the term "may", it is intended to indicate that any attribute included in "may" is optional.

[0023] In this embodiment, unless otherwise clearly specified and defined, terms such as "arranged", "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances. Embodiment

[0024] As Figures 1 to 7 shown, the present invention provides a gas volume measuring device for measuring the volume of gas in the airbag 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 in communication with the second measuring container 2; the conveying unit 3 is in communication with the airbag 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 airbag 100 to be in communication with 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 conveyed into the second measuring container 2. When the liquid in the first measuring container 1 is conveyed to fill the second measuring container 2, the gas path switching unit 5 can enable the airbag 100 to be in communication with 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 conveyed into the first measuring container 1.

[0025] In specific implementation, the first measuring container 1 and the second measuring container 2 are used to contain 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 continue to receive the gas from the air bag 100, while the other measuring container receives the liquid discharged from the previous measuring container, thereby 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. Through this design, when one measuring container is empty of liquid, the other measuring container will be filled with liquid, just like a seesaw, avoiding the operation of repeatedly adding water in the traditional drainage method, greatly improving the measurement efficiency, reducing the operation steps and time consumption, and reducing the errors caused by human factors. In terms of working principle, first fill the first measuring container 1 with liquid, and then guide the gas in the air bag 100 into the first measuring container 1 through the gas path switching unit 5, pushing the liquid into the second measuring container 2, and the second measuring container 2 can measure the volume of the liquid therein, thereby determining the volume of gas discharged from the air bag; when the liquid in the first measuring container 1 is completely transferred, switch to the second measuring container 2 to repeat the above process, and achieve accurate measurement of different gas volumes.

[0026] In this embodiment, the airbag 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 them, 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.

[0027] According to one embodiment of the present invention, the conveying unit 3 includes a liquid delivery pipe 31 and an air delivery mechanism 32; one end of the liquid delivery pipe 31 is connected to the first measuring container 1, and the other end of the liquid delivery pipe 31 is connected to the second measuring container 2; the air delivery 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 delivery mechanism 32.

[0028] During specific implementation, the liquid delivery pipe 31 is connected to the first measuring container 1 and the second measuring container 2. Its function is to ensure that the liquid can be smoothly transferred between the first measuring container 1 and the second measuring container 2. Moreover, the cooperation among the liquid delivery pipe 31, the first measuring container 1, and the second measuring container 2 can reflect whether there is still gas in the airbag 100. For example, if the liquid flows between the first measuring container 1 and the second measuring container 2, it means there is still gas in the airbag 100. The air delivery mechanism 32 is responsible for accurately delivering the gas in the airbag 100 into the first measuring container 1 or the second measuring container 2. The gas path switching unit 5 is connected to the air delivery mechanism 32. By controlling the gas flow direction, the gas can be introduced into the first measuring container 1 or the second measuring container 2 as needed, realizing a continuous and uninterrupted measurement process. For example, if the first measuring container 1 is filled with liquid, the air delivery mechanism 32 delivers the gas in the airbag 100 into the first measuring container 1.

[0029] In this embodiment, the liquid delivery pipe 31 may include three sections. One section is located in the first measuring container 1, another section 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.

[0030] According to an embodiment of the present invention, the air delivery mechanism 32 includes a three-way joint 321, a first pipe 322, a second pipe 323, and a third pipe 324. The three-way joint 321 has a first port, a second port, and a third port. One end of the first pipe 322 is connected to the airbag 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 gas path switching unit 5 is connected to the second pipe 323 and the third pipe 324.

[0031] During specific implementation, the gas path switching unit 5 determines whether the gas enters the first measuring container 1 or the second measuring container 2 by controlling the opening and closing of the second pipe 323 and the third pipe 324. Its working principle is to selectively open or close the second pipe 323 and the third pipe 324 by using the gas path switching unit 5, so that the gas in the airbag 100 can enter the first measuring container 1 or the second measuring container 2. Thus, the liquid is pushed by the gas to transfer from one measuring container to another, and the gas volume is determined by monitoring the liquid transfer amount. The whole process does not require manual intervention for adding water or adjustment, greatly reducing errors and improving the convenience and accuracy of measurement.

[0032] According to an 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 disposed in the second pipeline 323; the second control valve 52 is disposed 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, and 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.

[0033] Specifically, the first control valve 51 is disposed in the second pipeline 323 connecting the tee joint 321 and the first measuring container 1, and is responsible for managing whether gas can enter the first measuring container 1. The second control valve 52 is located in the third pipeline 324 connecting the tee joint 321 and the second measuring container 2, and is responsible for managing whether gas can enter the second measuring container 2.

[0034] In this embodiment, the first control valve 51 and the second control valve 52 may be of the prior art.

[0035] According to an 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 delivery pipe 31 extends into the bottom of the first measuring container 1 through the first liquid hole, and the other end of the liquid delivery pipe 31 extends into the bottom of the second measuring container 2 through the second liquid hole; the other end of the second pipeline 323 communicates with the first air hole; the other end of the third pipeline 324 communicates with the second air hole.

[0036] Specifically, the first air hole and the second air hole are mainly used to connect the air supply mechanism 32 to ensure that gas can smoothly enter the corresponding measuring container; while the first liquid hole and the second liquid hole allow the liquid delivery pipe 31 to extend into the bottom of the measuring container, so as to effectively transfer the liquid. Specifically, one end of the liquid delivery 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. Such a design ensures that the liquid can flow smoothly from the bottom of one measuring container to the bottom of another measuring container, without allowing the gas in the measuring container where the liquid is transferred to flow into the measuring container where the received transferred liquid is located, reducing errors. The second pipeline 323 is connected to the first air hole, so that gas can be introduced into the first measuring container 1; the third pipeline 324 is connected to the second air hole, so that 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 realizes the accurate measurement of the gas volume through precise control.

[0037] According to an embodiment of the present invention, it further includes a first laser rangefinder 6 and a second laser rangefinder 7; the first laser rangefinder 6 is arranged at 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 at the top of the second measuring container 2 and can detect the height of the liquid level in the second measuring container 2.

[0038] In specific implementation, the first laser rangefinder 6 is arranged at the top of the first measuring container 1 and can monitor the change in the height of the liquid in the first measuring container 1 in real time; similarly, the second laser rangefinder 7 is located at the top of the second measuring container 2 and is used to monitor the liquid level height in the second measuring container 2. Through this design, not only can the change data of the liquid level height be automatically and accurately obtained, but also the errors and inconveniences caused by traditional visual reading of the liquid level can be effectively reduced, improving the measurement accuracy and efficiency.

[0039] In this embodiment, the first laser rangefinder 6 and the second laser rangefinder 7 can be of the prior art.

[0040] According to an 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, in the state where 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. In the state where 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.

[0041] In specific implementation, when gas enters the measuring container (such as the first measuring container 1 or the second measuring container 2) from the airbag 100 through the conveying unit 3, the original air or gas inside the measuring container needs to have an outlet to discharge. Otherwise, the newly entered gas will not be able to effectively fill the measuring container because the pressure inside the measuring container will prevent more gas from flowing in. Therefore, exhaust holes (the first exhaust hole and the second exhaust hole) are provided at the top of each measuring container to provide a discharge path for the gas inside the measuring container.

[0042] In this embodiment, the first exhaust valve 41 and the second exhaust valve 42 can be of the prior art.

[0043] According to an embodiment of the present invention, it further includes a controller 8, a first gas flowmeter 9, a second gas flowmeter 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 flowmeter 9, the second gas flowmeter 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.

[0044] Specifically, the controller 8 is responsible for receiving data from each sensor (such as the first gas flowmeter 9, the second gas flowmeter 10, the first laser rangefinder 6, and the second laser rangefinder 7), and controlling the actions of each actuator (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 the preset logic.

[0045] In this embodiment, the controller 8, the first gas flowmeter 9, the second gas flowmeter 10, and the display screen can be of the prior art.

[0046] According to an embodiment of the present invention, it further includes a check valve, which is arranged in the first pipeline 322 and at one end of the first pipeline 322 communicating with the airbag 100, for conducting the airbag 100 to the first pipeline 322.

[0047] Specifically, a check valve is added to the gas volume measuring device. The check valve is arranged at one end of the first pipeline 322 close to the airbag 100, and its function is to ensure that the gas can only flow from the airbag 100 to the inside of the measuring device and will not flow backward.

[0048] In this embodiment, the check valve can be of the prior art. Embodiment

[0049] As Figures 1 to 8 shown, the present invention also provides a measuring method for the gas volume measuring device based on the above embodiment, including the following steps: Step S1: Declare a total liquid level height variable and initialize the total liquid level height variable to 0.

[0050] In this embodiment, taking the Python programming language as an example, a variable named total can be declared to store the total liquid level height value, and the variable is initialized to 0 (i.e., total = 0). Here, the total liquid level height variable is used to store the height of all liquid displacements during the measurement process, so as to finally obtain the total volume of the gas in the airbag 100 according to the value of the total liquid level height variable (because one height corresponds to one volume), and the total liquid level height value and the corresponding volume can be displayed through the display screen.

[0051] Step S2: As Figure 1As shown, open the first control valve 51 and the second exhaust valve 42, and close the second control valve 52 and the first exhaust valve 41.

[0052] In this embodiment, the operation of the valves can be controlled by the controller 8: open the first control valve 51 and the second exhaust valve 42, and at the same time close the second control valve 52 and the first exhaust valve 41. This step ensures that the gas can smoothly enter the first measuring container 1 from the airbag 100, and at the same time allows the gas in the second measuring container 2 to be discharged, preparing for the liquid transfer.

[0053] Step S3: Obtain the flow value of the gas in the second pipeline 323.

[0054] In this embodiment, the flow data of the gas in the second pipeline 323 can be detected by the first gas flowmeter 9 and transmitted to the controller 8. In this way, the controller 8 can obtain the flow value of the gas in the second pipeline 323.

[0055] Step S4: If the flow value of the gas in the second pipeline 323 is equal to zero, obtain the height of the liquid level in the second measuring container 2.

[0056] In this embodiment, when it is detected that the gas flow value in the second pipeline 323 is equal to zero (which means that the gas has stopped flowing into the first measuring container 1), the height data of the liquid level in the second measuring container 2 can be detected by the second laser rangefinder and transmitted to the controller 8. In this way, the controller 8 can obtain the height of the liquid level in the second measuring container 2. It can be understood that the measured values of the first gas flowmeter 9 and the second gas flowmeter are used to judge the truth or falsehood of the condition. For example, if the measured values are the number 1 and the number 5, their final effects are the same, both indicating that the condition is true. Therefore, even if there is an error in the measured value, it will not affect the volume measurement result.

[0057] 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, add the current value of the total liquid level height variable to the height of the liquid level in the second measuring container 2, then reassign the result to the total liquid level height variable, and end the measurement.

[0058] In this embodiment, when it is detected that the gas flow value in the second pipeline 323 is equal to zero (which means that the gas has stopped flowing into the first measuring container 1), it is necessary to further check two different situations. (1) The situation where there is less gas in the airbag 100: If the amount of gas in the airbag 100 is small, all the gas in the airbag 100 has been discharged into the first measuring container 1, and the liquid in the first measuring container 1 has not been completely discharged. Thus, the height of the liquid level in the second measuring container 2 is lower than the maximum value of the liquid level in the second measuring container 2. At this time, the height of the liquid level in the second measuring container 2 is obtained by the second laser rangefinder 7, and the volume corresponding to the change in the liquid level height is calculated, so as to obtain the total volume of the gas in the airbag 100. In this case, the measurement process can be directly ended because all the gas has been transferred and its volume has been accurately calculated. (2) The situation where there is more gas in the airbag 100: If the amount of gas in the airbag 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 remaining gas in the airbag 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 maximum value of the liquid level in the second measuring container 2.

[0059] According to an embodiment of the present invention, the following steps are further included: Step S6: If the height of the liquid level in the second measuring container 2 is equal to the maximum value of the liquid level in the second measuring container 2, then add the current value of the total liquid level height variable to the height of the liquid level in the second measuring container 2, and then re-assign the result to the total liquid level height variable.

[0060] In this embodiment, through the judgment condition of step S6, it can be determined that there is either no gas in the airbag 100 or there is still gas. However, the second measuring container 2 is full and cannot continue to measure the remaining gas in the airbag 100. Therefore, the current liquid level height of the second measuring container 2 can be recorded first (that is, total = total + the current liquid level height of the second measuring container 2). Just like a patient in a hospital needs to be continuously injected. Now a tube of injection has been completed, and this tube needs to be recorded, and then continue to inject. Each time a tube is injected, it is recorded until all the injections are completed. By recording, it is convenient to know how many tubes of injection have been made in the end.

[0061] It can be understood that in "total = total + the current liquid level height of the second measuring container 2", "=" represents assignment. Just like 3 = 2 (the value of total on the right side) + 1, the result of adding 2 and 1, which is 3, is put into the variable total on the left side. Total can be simply understood as a container for storing data, that is, a variable.

[0062] Step S7: As Figure 4As shown, open the second control valve 52 and the first exhaust valve 41, and close the first control valve 51 and the second exhaust valve 42.

[0063] In this embodiment, open the second control valve 52 and the first exhaust valve 41, and at the same time close the first control valve 51 and the second exhaust valve 42, 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.

[0064] Step S8: Obtain the flow value of the gas in the third pipeline 324.

[0065] In this embodiment, the flow data of the gas in the third pipeline 324 can be detected by the second gas flowmeter 10 and transmitted to the controller 8. In this way, the controller 8 can obtain the flow value of the gas in the third pipeline 324.

[0066] Step S9: If the flow value of the gas in the third pipeline 324 is equal to zero, obtain the height of the liquid level in the first measuring container 1.

[0067] In this embodiment, when it is detected that the gas flow value in the third pipeline 324 is equal to 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.

[0068] Step S10: Add the current value of the total liquid level height variable to the height of the liquid level in the first measuring container 1, and then reassign the result to the total liquid level height variable.

[0069] In this embodiment, the function of step S10 is to update the total liquid level height value, just like the above-mentioned patient is injected with an injection and the dose of the injection is recorded.

[0070] 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, end the measurement.

[0071] 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 left in the air bag 100. In this case, the measurement process can be directly ended.

[0072] 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, return to step S2 and execute it in a loop.

[0073] In this embodiment, if the height of the liquid level in the first measuring container 1 is equal to the maximum value of the liquid level in the first measuring container 1, it means that there is still gas in the airbag 100. That is to say, more gas is measured, just like the condition of the above-mentioned patient is more serious. After injecting two syringes of medicine, it is still not enough and continuous injection is needed until there is no medicine left.

[0074] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention according to the content disclosed in the application documents.

Claims

1. A gas volume measuring device for measuring the volume of gas in an air bag (100), characterized in that: include: 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 gas 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 gas 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).

2. The gas volume measuring device according to claim 1, characterized in that: The delivery unit (3) comprises a liquid delivery pipe (31) and an air delivery mechanism (32); One end of the liquid delivery tube (31) is connected to the first measuring container (1), and the other end of the liquid delivery tube (31) is connected to the second measuring container (2); The air supply mechanism (32) is in communication with the air bag (100), the first measuring container (1), and the first measuring container (1); The gas path switching unit (5) is connected to the gas supply mechanism (32).

3. The gas volume measuring device according to claim 2, characterized in that: The air supply mechanism (32) comprises a tee (321), a first pipeline (322), a second pipeline (323) and a third pipeline (324); The three-way (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 gas path switching unit (5) connects the second pipeline (323) and the third pipeline (324).

4. The gas volume measuring device according to claim 3, characterized in that: The gas path switching unit (5) comprises 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); 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.

5. The gas volume measuring device according to claim 4, characterized in that: 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 delivery tube (31) extends into the bottom of the first measuring container (1) through the first liquid hole, and the other end of the liquid delivery tube (31) extends into 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.

6. The gas volume measuring device according to claim 5, characterized in that: 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 is capable of detecting 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 is capable of detecting the height of the liquid level in the second measuring container (2).

7. The gas volume measuring device according to claim 6, characterized in that: The first measuring container (1) further comprises a first exhaust hole located at the top of the first measuring container (1); The second measuring container (2) further comprises a second exhaust hole located at the top of the second measuring container (2); The exhaust unit (4) comprises 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).

8. The gas volume measuring device according to claim 7, characterized in that: 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.

9. A measurement method based on the gas volume measurement device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step S1: declare a total liquid level height variable, and initialize the total liquid level height variable to 0; Step S2: opening the first control valve (51) and the second exhaust valve (42), and closing the second control valve (52) and the first exhaust valve (41); Step S3: obtaining the flow value of the gas in the second pipeline (323); Step S4: if the flow value of the gas in the second pipeline (323) is equal to zero, obtaining the height of the liquid level in the second measuring container (2); 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 the result is then reassigned to the total liquid level height variable, and the measurement is terminated.

10. The measuring method according to claim 9, characterized in that: The following steps are also included: 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), then the current value of the total liquid level variable is added to the liquid level of the second measuring container (2), and then the result is reassigned to the total liquid level variable, and 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; Step S7: obtaining the flow value of the gas in the third pipeline (324); Step S8: If the flow value of the gas in the third pipeline (324) is equal to zero, obtaining the height of the liquid level in the first measuring container (1); Step S9: adding the current value of the total liquid level height variable to the liquid level height of the first measuring container (1), and then reassigning the result to the total liquid level height variable; Step S10: 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), then the measurement is terminated; Step S11: 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 and is executed in a loop.

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