Gas filling billing device and gas filling billing method

Abstract

The invention relates to a gas filling billing device and a gas filling billing method, and belongs to the technical field of gas billing, the gas filling billing device comprises a metering cylinder, a piston, a piston rod, a gas source connector and a filling connector, the metering cylinder is used for containing gas of unit volume; the piston is connected into the metering cylinder in a sliding mode, and the metering cylinder is divided into a first cavity and a second cavity. The piston rod is connected with the piston, the end, away from the piston, of the piston rod is in transmission connection with a power source, and the power source drives the piston to reciprocate in the metering cylinder through the piston rod and is connected with a counter which records reciprocating times of the piston. The air source connector is connected with an air source, a first pressure reducing valve and a second pressure reducing valve, the first pressure reducing valve is communicated with the first cavity, and the second pressure reducing valve is communicated with the second cavity; the filling joint is communicated with the first cavity and the second cavity, and a one-way valve is connected between the filling joint and the first cavity or the second cavity; the technical problem that in the prior art, accurate charging is difficult during hydrogen filling can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of axial flow fan production and manufacturing, and in particular relates to a gas filling and charging device and a gas filling and charging method. Background Art

[0002] In hydrogen filling metering, special mass flow meters, volumetric flow meters and other equipment are usually used for metering. However, due to the low density of hydrogen, the mass flow meter's measurement will be inaccurate. The high compressibility and high expansion of hydrogen cause large volume changes due to changes in pressure and temperature, making it difficult to measure accurately.

[0003] The existing patent with publication number CN118780842A discloses a billing method for natural gas blended with hydrogen transmission and distribution, which is applied to the natural gas blended with hydrogen transmission and distribution system. The system includes pipelines at various levels, flow meters installed on each pipeline of the last level, and first calorific value analyzers installed on each previous-level pipeline, and the previous-level pipeline is the pipeline of the previous level of each pipeline of the last level; each of the first calorific value analyzers and each of the flow meters are connected to a monitoring terminal; the method includes: receiving the first calorific value data of each first calorific value analyzer through the monitoring terminal; for each previous-level pipeline, calculating the ratio of natural gas to hydrogen in the previous-level pipeline according to the corresponding first calorific value data; and obtaining the billing method for natural gas blended with hydrogen transmission and distribution according to the ratio of natural gas to hydrogen in each previous-level pipeline.

[0004] The prior art has the following problems:

[0005] When using a calorific value analyzer to calculate the amount of hydrogen, only a safer non-contact calorific value analyzer can be used. However, the filling of hydrogen involves problems of high pressure and high flow rate. During high-pressure filling (35MPa-70MPa), the intensified collision of hydrogen molecules will lead to a decrease in spectral resolution and affect the measurement accuracy. The turbulence generated by the high flow rate will cause gas density fluctuations and distort the optical path, resulting in abnormal fluctuations in the transmitted light intensity. Therefore, it is impossible to accurately bill hydrogen during filling. Summary of the invention

[0006] The present invention provides a gas filling charging device and a gas filling charging method, which can solve the technical problem of difficulty in accurate charging during hydrogen filling in the prior art.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] The present application provides a gas filling and billing device, which includes a metering cylinder, a piston, a piston rod, an air source joint and a filling joint. The metering cylinder is used to contain a unit volume of gas; the piston is slidably connected in the metering cylinder to separate the metering cylinder into a first chamber and a second chamber; the piston rod is connected to the piston, and the end of the piston rod away from the piston is transmission-connected to a power source, and the power source drives the piston to reciprocate in the metering cylinder through the piston rod, and the power source is connected to a counter, and the counter records the number of round trips of the piston; the air source joint is connected to the air source, a first pressure reducing valve and a second pressure reducing valve, the first pressure reducing valve is connected to the first chamber, and the second pressure reducing valve is connected to the second chamber; the filling joint is connected to the first chamber and the second chamber, and a one-way valve is connected between the filling joint and the first chamber or the second chamber.

[0009] Through the above technical scheme, a pressure reducing valve is used to determine that the pressure of hydrogen filled into the metering cylinder is constant, the volume of the metering cylinder is constant, and then the movement of the piston is used to push out the hydrogen for filling, and the number of fillings is recorded by a counter to obtain the total amount of filling at a constant pressure, constant volume and constant temperature, thereby obtaining a relatively accurate billing result.

[0010] In the present invention, the main body of the metering cylinder is barrel-shaped tempered glass.

[0011] Through the above technical solution, tempered glass is used as the main body of the metering cylinder, which reduces the risk of hydrogen embrittlement and improves the safety of the billing device.

[0012] In the present invention, the power source is a stepper motor, a crankshaft is connected between the stepper motor and the piston rod, the counter is connected to the end face of the crankshaft, and the counter is used to record the number of revolutions of the crankshaft.

[0013] Through the above technical solution, using a stepper motor and a crankshaft, the angle of rotation of the crankshaft can be accurately controlled, and then the number of reciprocating motions of the piston can be accurately controlled, further improving the accuracy of billing.

[0014] In the present invention, the gas filling and charging device further comprises a buffer cylinder, which is connected between the gas source connector and the metering cylinder, and the buffer cylinder is arranged around the outer side of the metering cylinder.

[0015] Through the above technical solution, a buffer cylinder is used to buffer and reduce the pressure of the gas entering the metering cylinder, thereby avoiding drastic temperature changes caused by gas pressure changes, improving temperature control during billing, and increasing billing accuracy.

[0016] In the present invention, the gas filling and charging device further comprises a thermometer, which is connected to the filling connector and is used to collect the gas temperature at the filling connector.

[0017] Through the above technical solution, a thermometer is used to monitor the temperature at the filling joint, and the speed of the stepper motor is adjusted in real time, which reduces the rate of increase of the temperature in the gas cylinder during filling, avoids the impact of the temperature rise on the billing device, and improves the billing accuracy of the billing device.

[0018] In the present invention, the gas filling and billing device further comprises an electronic scale, which is connected to the bottom of the metering cylinder and is used to collect the total weight of the metering cylinder and the buffer cylinder when the metering cylinder is filled with gas.

[0019] Through the above technical solution, an electronic scale is used to record the weight value of the entire device, obtain the mass of hydrogen filled once, and then verify the total filling mass data, thereby improving the reliability of the billing data.

[0020] In the present invention, the above-mentioned gas filling and billing device also includes a universal ball joint and a glass pillar. The universal ball joint is connected to the middle part of the piston rod, and the universal ball joint is made of tempered glass; the glass pillar is connected to the electronic scale, and the end of the glass pillar facing away from the electronic scale is connected to a support ring, and the support ring is sleeved on the outside of the metering cylinder.

[0021] Through the above technical solution, the universal ball shaft and glass pillar made of glass are used to reduce the external heat exchange of the device and further improve the billing accuracy.

[0022] The present application also provides a gas filling charging method, which uses the above-mentioned gas filling charging device and also includes the following steps:

[0023] Step S1: Obtain the counter record data N, obtain the threshold pressure p of the first pressure reducing valve and the second pressure reducing valve, obtain the volume V of the metering cylinder, and collect the temperature T when the metering cylinder is filled with gas through a temperature gun 1 ;

[0024] Step S2: Calculate the amount n of hydrogen using the van der Waals equation;

[0025] Step S3: Calculate the mass M1 of hydrogen according to the mass n and the molar mass M of hydrogen, and calculate the hydrogen cost Q1 according to the mass M1 of hydrogen and the unit price of hydrogen.

[0026] Through the above technical solution, a relatively more accurate filling fee can be obtained based on a constant value that is easier to control and a calculation method under actual gas conditions.

[0027] In the present invention, the gas filling charging method further includes:

[0028] Step S4: Obtain each weighing data of the electronic scale within the number of times recorded by the counter and take the average value as M2. Calculate the hydrogen cost Q2 based on M2 and the unit price of hydrogen. The total billing price Q= (αQ1+βQ2) / 2.

[0029] Through the above technical solution, the fees obtained by the two billing methods are combined, and a more accurate billing result is obtained based on a weighted average algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 work.

[0031] Figure 1 A partial circuit diagram of a gas filling charging device provided by an embodiment of the present invention;

[0032] Figure 2 A circuit diagram of a gas filling and charging device provided in an embodiment of the present invention;

[0033] Figure 3 A structural axonometric diagram of a gas filling and charging device provided in an embodiment of the present invention after removing a power source;

[0034] Figure 4 A top view of the structure of a gas filling and charging device provided in an embodiment of the present invention with the power source removed.

[0035] Icons: 1-metering cylinder; 101-first chamber; 102-second chamber; 2-piston; 201-piston rod; 202-universal ball shaft; 203-crankshaft; 204-counter; 3-air source connector; 401-first pressure reducing valve; 402-second pressure reducing valve; 403-third pressure reducing valve; 404-check valve; 5-buffer cylinder; 6-filling connector; 7-thermometer; 8-electronic scale; 801-glass pillar; 802-support ring. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Example:

[0041] Please refer to Figures 1 to 4 , Figures 1 to 4 An embodiment of the present application is shown.

[0042] This embodiment provides a gas filling charging device, such as Figure 1 and Figure 2As shown, it includes a metering cylinder 1, a piston 2, a piston rod 201, an air source connector 3 and a filling connector 6. The metering cylinder 1 is used to contain a unit volume of gas; the piston 2 is slidably connected in the metering cylinder 1 to separate the metering cylinder 1 into a first chamber 101 and a second chamber 102; the piston rod 201 is connected to the piston 2, and the end of the piston rod 201 away from the piston 2 is transmission-connected to a power source, which drives the piston 2 to reciprocate in the metering cylinder 1 through the piston rod 201, and the power source is connected to a counter 204, which records the number of times the piston 2 goes back and forth; the air source connector 3 is connected to an air source, a first pressure reducing valve 401 and a second pressure reducing valve 402, the first pressure reducing valve 401 is connected to the first chamber 101, and the second pressure reducing valve 402 is connected to the second chamber 102; the filling connector 6 is connected to the first chamber 101 and the second chamber 102, and a one-way valve 404 is connected between the filling connector 6 and the first chamber 101 or the second chamber 102.

[0043] When in use, the air source connector 3 is connected to the air source, and the air source pressure is greater than the preset pressure of the first pressure reducing valve 401 and the second pressure reducing valve 402. In the initial state, the piston 2 is attached to the side wall of the metering cylinder 1, and the first chamber 101 or the second chamber 102 is completely squeezed. When working, Figure 3 and Figure 4 As shown, the piston 2 is driven by the crankshaft 203 driven by the stepper motor to make a reciprocating motion in the metering cylinder 1. When the piston 2 moves to the right, a negative pressure is generated in the first chamber 101, and the gas is decompressed by the first pressure reducing valve 401 and then filled into the first chamber 101, while the gas in the second chamber 102 is compressed. Due to the presence of the one-way valve 404, the compressed gas is then filled into the gas cylinder through the third pressure reducing valve 403.

[0044] It should be noted that, because the gas has been reduced to the rated pressure when passing through the first pressure reducing valve 401 and the second pressure reducing valve 402, and the negative pressure generated by the movement of the piston 2 is sucked into the metering cylinder 1, there will be no compression problem when the gas is filled into the metering cylinder 1, and a constant volume and pressure gas is obtained. At the same time, because the gas is introduced after reduced pressure, no heat will be generated due to compression, and the low temperature caused by the reduced pressure can further reduce the molecular activity of hydrogen, thereby obtaining a more accurate result; at the same time, the valve bodies in this embodiment are all explosion-proof valves or intrinsically safe valves.

[0045] Through the above technical scheme, a pressure reducing valve is used to determine that the pressure of hydrogen filled into the metering cylinder 1 is constant, the volume of the metering cylinder 1 is constant, and then the movement of the piston 2 is used to push out the hydrogen for filling, and the number of fillings is recorded by the counter 204 to obtain the total amount of filling at a constant pressure, constant volume and constant temperature, thereby obtaining a relatively accurate billing result.

[0046] As a preferred implementation, the main body of the metering cylinder 1 is made of barrel-shaped tempered glass.

[0047] Hydrogen embrittlement, also known as hydrogen embrittlement fracture, refers to the phenomenon that when a metal material is subjected to tension, the toughness and ductility of the material decrease significantly due to the absorption of hydrogen atoms, and brittle fracture occurs under stress below the normal strength limit of the material. This phenomenon is usually irreversible. Once hydrogen embrittlement occurs, it is difficult for the material's performance to return to its original state. Therefore, using tempered glass as the cylinder body of the metering cylinder 1 can effectively prevent hydrogen from penetrating the cylinder body.

[0048] Through the above technical solution, tempered glass is used as the main body of the metering cylinder 1, which reduces the risk of hydrogen embrittlement and improves the safety of the billing device.

[0049] As a preferred embodiment, the power source is a stepper motor, a crankshaft 203 is connected between the stepper motor and the piston rod 201, a counter 204 is connected to the end face of the crankshaft 203, and the counter 204 is used to record the number of revolutions of the crankshaft 203.

[0050] When in use, the input signal of the stepper motor is always a rotation of 180 degrees, thereby ensuring that each rotation of the piston 2 makes a reciprocating motion. The counter 204 cooperates with the external reading head to record the number of rotations of the crankshaft 203. One circle means that the piston 2 is filled with two units of hydrogen in one round trip.

[0051] Through the above technical solution, using a stepper motor and a crankshaft 203, the rotation angle of the crankshaft 203 can be accurately controlled, and then the number of reciprocating motions of the piston 2 can be accurately controlled, further improving the accuracy of billing.

[0052] As a preferred implementation method, Figures 2 to 4 As shown, the gas filling and charging device further includes a buffer cylinder 5 , which is connected between the gas source connector 3 and the metering cylinder 1 , and the buffer cylinder 5 is arranged around the outer side of the metering cylinder 1 .

[0053] When in use, the gas source first enters the buffer cylinder 5 for the first pressure reduction, while absorbing the heat generated by the gas compression in the metering cylinder 1 during the previous exhaust, and then the negative pressure generated by the movement of the piston 2 is used to introduce the reduced-pressure gas into the metering cylinder 1.

[0054] Through the above technical solution, the buffer cylinder 5 is used to buffer and reduce the pressure of the gas entering the metering cylinder 1, so as to avoid drastic temperature changes caused by pressure changes of the gas, improve the temperature control during billing, and increase the billing accuracy.

[0055] As a preferred implementation method, Figure 1 As shown, the above-mentioned gas filling and billing device also includes a thermometer 7, which is connected to the filling connector 6. The thermometer 7 is used to collect the gas temperature at the filling connector 6. The thermometer 7 is communicatively connected to the stepping motor.

[0056] During use, when the thermometer 7 detects an abnormal increase in temperature at the filling connector 6, it can be determined that the inflation speed is too fast, causing the gas to heat up quickly. At this time, the stepping signal frequency of the stepping motor is reduced to slow down the movement speed of the piston 2 in the metering cylinder 1.

[0057] Through the above technical solution, a thermometer 7 is used to monitor the temperature at the filling connector 6, and the speed of the stepper motor is adjusted in real time, thereby reducing the rate of increase of the temperature in the gas cylinder during filling, avoiding the impact of the temperature rise on the billing device, and improving the billing accuracy of the billing device.

[0058] As a preferred implementation method, Figure 3 As shown, the gas filling and billing device further includes an electronic scale 8, which is connected to the bottom of the metering cylinder 1. The electronic scale 8 is used to collect the total weight of the metering cylinder 1 and the buffer cylinder 5 when the metering cylinder 1 is filled with gas.

[0059] Through the above technical solution, an electronic scale 8 is used to record the weight value of the entire device, obtain the mass of hydrogen filled once, and then verify the total filling mass data, thereby improving the reliability of the billing data.

[0060] As a preferred implementation method, Figure 3 and Figure 4 As shown, the above-mentioned gas filling and billing device also includes a universal ball shaft 202 and a glass pillar 801. The universal ball shaft 202 is connected to the middle part of the piston rod 201, and the universal ball shaft 202 is made of tempered glass; the glass pillar 801 is connected to the electronic scale 8, and the end of the glass pillar 801 facing away from the electronic scale 8 is connected to a support ring 802, and the support ring 802 is sleeved on the outer side of the metering cylinder 1.

[0061] When in use, the temperature generated by compression of the metering cylinder 1 will be absorbed by the buffer cylinder 5 to prevent heat from being transferred outward along the piston rod 201. At the same time, because the tempered glass is an insulator, it can also prevent leakage of the stepping motor or the electronic scale 8 from being transferred to the metering cylinder 1.

[0062] Through the above technical solution, the universal ball shaft 202 and glass pillar 801 made of glass are used to reduce the heat exchange of the device to the outside, and further improve the accuracy of billing.

[0063] This embodiment provides a gas filling charging method, which uses the above-mentioned gas filling charging device and also includes the following steps:

[0064] Step S1: Obtain the data recorded by the counter 204 as N, obtain the threshold pressure p of the first pressure reducing valve 401 and the second pressure reducing valve 402, obtain the volume V of the metering cylinder 1, and collect the temperature T of the metering cylinder 1 when it is filled with gas through a temperature gun 1 ;

[0065] Step S2: Calculate the amount n of hydrogen using the van der Waals equation;

[0066] Step S3: Calculate the mass M1 of hydrogen according to the mass n and the molar mass M of hydrogen, and calculate the hydrogen cost Q1 according to the mass M1 of hydrogen and the unit price of hydrogen.

[0067] When calculating, we choose the van der Waals equation for calculation:

[0068]

[0069] Where P is the threshold pressure p of the pressure reducing valve, V is the volume of the metering cylinder 1, and T is the temperature T when the metering cylinder 1 is filled with gas. 1 , R is the universal gas constant, n is the amount of substance, and a and b are the van der Waals constants of hydrogen.

[0070] When calculating, expand the original equation to obtain:

[0071]

[0072] After transposing the items we can obtain:

[0073]

[0074] To obtain the cubic equation, we use a numerical calculation method, exemplarily using the Newton-Raphson iteration formula:

[0075]

[0076] get:

[0077]

[0078] right The derivative is

[0079] When calculating specifically, first give an initial guess value n 0 , and then continuously update the value of n through the iterative formula until the convergence condition is met, such as: , A very small positive number is preset.

[0080] Through the above technical solution, a relatively more accurate filling fee can be obtained based on a constant value that is easier to control and a calculation method under actual gas conditions.

[0081] As a preferred implementation, the gas filling charging method further includes:

[0082] Step S4: Obtain each weighing data of the electronic scale 8 within the number of times recorded by the counter 204 and take the average value as M2, calculate the hydrogen cost Q2 according to M2 and the unit price of hydrogen, and the total billing price Q=(αQ1+βQ2) / 2.

[0083] Among them, α and β are weighted coefficients, which are calculated by the total price of hydrogen before filling in the previous quarter and the costs generated by the two billing methods, and are used for billing in the next quarter.

[0084] Through the above technical solution, the fees obtained by the two billing methods are combined, and a more accurate billing result is obtained based on a weighted average algorithm.

[0085] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A gas filling charging device, characterized in that: include: A metering cylinder (1) for containing a unit volume of gas; A piston (2) is slidably connected in the metering cylinder (1) to separate the metering cylinder (1) into a first chamber (101) and a second chamber (102); A piston rod (201) is connected to the piston (2); one end of the piston rod (201) facing away from the piston (2) is drivingly connected to a power source, the power source drives the piston (2) to perform reciprocating motion in the metering cylinder (1) through the piston rod (201); the power source is connected to a counter (204), and the counter (204) records the number of reciprocating motions of the piston (2); An air source connector (3) connected to an air source, a first pressure reducing valve (401) and a second pressure reducing valve (402), wherein the first pressure reducing valve (401) is in communication with the first chamber (101), and the second pressure reducing valve (402) is in communication with the second chamber (102); The filling connector (6) is in communication with the first chamber (101) and the second chamber (102); a one-way valve (404) is connected between the filling connector (6) and the first chamber (101) or the second chamber (102).

2. The gas filling charging device according to claim 1, characterized in that: The main body of the metering cylinder (1) is barrel-shaped tempered glass.

3. The gas filling charging device according to claim 2, characterized in that: The power source is a stepper motor, a crankshaft (203) is connected between the stepper motor and the piston rod (201), the counter (204) is connected to the end surface of the crankshaft (203), and the counter (204) is used to record the number of revolutions of the crankshaft (203).

4. The gas filling charging device according to claim 3, characterized in that: Also includes: The buffer cylinder (5) is connected between the gas source connector (3) and the metering cylinder (1), and the buffer cylinder (5) is arranged around the outside of the metering cylinder (1).

5. The gas filling charging device according to claim 4, characterized in that: Also includes: A thermometer (7) is connected to the filling connector (6), and the thermometer (7) is used to collect the gas temperature at the filling connector (6).

6. The gas filling charging device according to claim 5, characterized in that: Also includes: An electronic scale (8) is connected to the bottom of the metering cylinder (1), and the electronic scale (8) is used to collect the total weight of the metering cylinder (1) and the buffer cylinder (5) when the metering cylinder (1) is filled with gas.

7. The gas filling charging device according to claim 6, characterized in that: Also includes: A universal ball shaft (202) connected to the middle portion of the piston rod (201), wherein the universal ball shaft (202) is made of tempered glass; A glass pillar (801) is connected to the electronic scale (8); one end of the glass pillar (801) facing away from the electronic scale (8) is connected to a support ring (802); and the support ring (802) is sleeved on the outside of the metering cylinder (1).

8. A gas filling charging method, characterized in that: The gas filling charging device according to claim 7 is used, further comprising the following steps: Step S1: Obtain the data N recorded on the counter (204), obtain the threshold pressure p of the first pressure reducing valve (401) and the second pressure reducing valve (402), obtain the volume V of the metering cylinder (1), and collect the temperature T of the metering cylinder (1) when it is filled with gas through a temperature gun. 1； Step S2: Calculate the amount n of hydrogen using the van der Waals equation; Step S3: Calculate the mass M1 of hydrogen according to the mass n and the molar mass M of hydrogen, and calculate the hydrogen cost Q1 according to the mass M1 of hydrogen and the unit price of hydrogen.

9. The gas filling charging method according to claim 8, characterized in that: Also includes: Step S4: Obtain each weighing data of the electronic scale (8) within the number of times recorded by the counter (204) and take the average value as M2, calculate the hydrogen cost Q2 based on M2 and the unit price of hydrogen, and the total billing price Q=(αQ1+βQ2) / 2.

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