High-pressure mass flow meter for hydrogen adding machine

Abstract

The utility model provides a high-pressure mass flow meter for a hydrogen dispenser, which relates to the technical field of flow meters and comprises a sensor shell and a chassis mounted at the bottom of the sensor shell. Two groups of U-shaped measuring tubes are arranged in the middle of the inner side of the sensor shell, the two groups of U-shaped measuring tubes are symmetrically distributed at the two ends of the inner side of the sensor shell, drivers are arranged at the tops of the two groups of U-shaped measuring tubes, signal collectors are arranged at the bent arc positions of the U-shaped measuring tubes, and damping pieces are arranged at the bottoms of the U-shaped measuring tubes; a flow divider is arranged on one side of the upper end of the base plate, one ends of the two sets of U-shaped measuring pipes are connected with the flow divider, and the flow divider is fixedly installed in the middle of the upper end of the base plate through a high-pressure threaded connector. According to the utility model, the high-pressure screwed joint penetrates through the chassis and is directly connected with the flow divider, so that the structure is more compact, the space is saved, the stability of the structure is ensured, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flow meters, in particular to a high-pressure mass flow meter for a hydrogenation machine. Background Art

[0002] A hydrogen refueler is the core equipment for refueling fuel cells in fuel cells. Its primary functions are safe and rapid hydrogen refueling and precise metering. This means ensuring safe and rapid refueling of the vehicle's onboard hydrogen tank while accurately measuring the amount and price of hydrogen refueled. Currently, two pressure levels are available: 35MPa and 70MPa. A hydrogen refueler is equipped with a refueling gun, pressure sensor, temperature sensor, hydrogen flowmeter, refueling control device, safety device, and hoses. The hydrogen flowmeter is a key metering device.

[0003] The flowmeter used in hydrogenation machines is typically a Coriolis mass flowmeter. This device directly measures mass flow by utilizing the Coriolis force generated by fluid flowing through a vibrating pipe, which is proportional to the mass flow rate. It consists of a flow sensor and a transducer. Coriolis mass flowmeters offer direct mass flow measurement with high accuracy and the ability to measure multiple media and process parameters. They are widely used in the petrochemical, pharmaceutical, and food industries.

[0004] However, in the process of implementing the above technical solution, it was found that the above technical solution had the following technical problems:

[0005] First, the production cost is high. The chassis is the largest and most material-intensive component of a small Coriolis mass flowmeter. Existing hydrogen refueling machine mass flowmeters have flow channels machined into the chassis, with the measuring tube and high-pressure threaded joints welded directly to the chassis. This makes the chassis part of the hydrogen pipeline. Because the medium is high-pressure hydrogen, to prevent hydrogen embrittlement and pipeline leakage, the hydrogen pipeline needs to be made of hydrogen-embrittlement-resistant and corrosion-resistant materials, such as XM-19 and Hastelloy. These materials are expensive and difficult to process, resulting in high costs.

[0006] Second, the installation space is large. Traditional equipment inlets and outlets are mostly arranged horizontally at both ends of the chassis centerline, which requires a large amount of installation space. In addition, because it is used for 35 / 70MPa high-pressure hydrogen applications, traditional high-pressure threaded joints usually use C&T threaded connections, and the joint length is relatively long, further increasing the installation space requirements.

[0007] To solve the above problems, we propose a high-pressure mass flow meter for hydrogen refueling machine to solve the above problems. Utility Model Content

[0008] In order to solve the problems in the background technology, the utility model provides a high-pressure mass flow meter for a hydrogenation machine.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0010] A high-pressure mass flowmeter for a hydrogenator comprises a sensor housing and a chassis mounted at the bottom of the sensor housing; two groups of U-shaped measuring tubes are provided in the middle portion of the inner side of the sensor housing, the two groups of U-shaped measuring tubes are symmetrically distributed at the inner ends of the sensor housing, the tops of the two groups of U-shaped measuring tubes are provided with drivers, the bends of the U-shaped measuring tubes are provided with signal collectors, and the bottoms of the U-shaped measuring tubes are provided with shock-absorbing plates; a diverter is provided on one side of the upper end of the chassis, and the air inlet ends of the two groups of U-shaped measuring tubes are respectively connected to the outlet ends of the diverter.

[0011] Preferably, the diverter is fixedly mounted on the middle portion of the upper end of the chassis via a high-pressure threaded joint, and the diverter and the high-pressure threaded joint are welded into a whole.

[0012] Preferably, an air outlet and an air inlet are respectively provided on both sides of the bottom end of the chassis, the air inlet is connected to the diverter, and the air outlet is connected to the outlet ends of the two groups of U-shaped measuring tubes.

[0013] Preferably, the shock-absorbing plate is configured as a double-layer structure.

[0014] Preferably, the side end surface of the chassis is provided with multiple groups of threaded holes.

[0015] Preferably, the U-shaped measuring tube and the diverter are fixed by welding.

[0016] Preferably, the U-shaped measuring tube and the shock-absorbing plate are fixed by welding.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This solution has the advantage of reducing costs. The high-pressure threaded joint passes through the chassis and is directly connected to the diverter, which prevents the chassis from contacting hydrogen. Therefore, the chassis can be made of cheaper materials, such as 304 stainless steel, which greatly reduces production costs.

[0019] The overall size of the flow meter of this solution is more compact, which has the advantage of saving installation space. First, the signal collector is arranged on the inside of the U-shaped measuring tube, which reduces the width. Second, the air inlet and the air outlet are arranged in parallel below the chassis. Compared with the traditional equipment in which the inlet and outlet are arranged horizontally at both ends of the chassis center axis, the width is reduced by more than 30%; and the high-pressure threaded joint designed in this patent directly passes through the chassis and is connected to the diverter. Compared with the traditional technology of welding the high-pressure threaded joint to the chassis, the structure of this utility model is more compact, saves space, and ensures the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 It is a side sectional structural diagram of the utility model;

[0022] Figure 3 It is a side plan view of the utility model.

[0023] In the figure: 1. Sensor housing; 2. U-shaped measuring tube; 3. Driver; 4. Signal collector; 5. Shock absorber; 6. Diverter; 7. High-pressure threaded connector; 8. Chassis; 9. Threaded hole; 10. Air outlet; 11. Air inlet. DETAILED DESCRIPTION

[0024] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0025] Example: Refer to Figure 1-Figure 3 As shown, a high-pressure mass flowmeter for a hydrogenation machine according to this embodiment includes a sensor housing 1 and a chassis 8 installed at the bottom of the sensor housing 1 .

[0026] Two sets of U-shaped measuring tubes 2 are provided in the middle of the inner side of the sensor housing 1. The two sets of U-shaped measuring tubes 2 are symmetrically distributed at both ends of the inner side of the sensor housing 1. A driver 3 is provided on the top of each set of U-shaped measuring tubes 2. A signal collector 4 is provided at the bend of the U-shaped measuring tubes 2. A shock-absorbing plate 5 is provided at the bottom of the U-shaped measuring tubes 2.

[0027] A diverter 6 is provided on one side of the upper end of the chassis 8. The air inlet ends of the two groups of U-shaped measuring tubes 2 are respectively connected to the outlet ends of the diverter 6. The diverter 6 is fixedly installed in the middle of the upper end of the chassis 8 through a high-pressure threaded joint 7. The gas is respectively transported to the two groups of U-shaped measuring tubes 2 through the diverter 6 for diversion and transportation.

[0028] The chassis 8 is made of a whole piece of 304 stainless steel and has two left-right symmetrical through holes at the bottom. The diverter 6 and the high-pressure threaded joint 7 are welded into a whole and fixed on the chassis 8 through the through holes.

[0029] In some examples, the diverter 6 and the high-pressure threaded joint 7 are fixed by argon arc welding, and the U-shaped measuring tube 2 and the diverter 6 are fixed by argon arc welding. Argon arc welding has a high penetration depth, ensuring that the welding part has sufficient pressure resistance to avoid high-pressure gas leakage.

[0030] In some examples, an air outlet 10 and an air inlet 11 are respectively provided on both sides of the bottom end of the chassis 8 , the air inlet 11 is connected to the diverter 6 , and the air outlet 10 is connected to the outlet ends of the two sets of U-shaped measuring tubes 2 .

[0031] In some examples, the shock-absorbing plate 5 is set to a double-layer structure, and the U-shaped measuring tube 2 and the shock-absorbing plate 5 are fixed by welding. During welding, the shock-absorbing plate 5 is first fixed to the U-shaped measuring tube 2 by laser spot welding, and then fixed by vacuum brazing. Laser spot welding is only used for positioning, which can minimize the ablation of the pipeline; vacuum brazing can completely fill the weld and perform solid solution treatment on the U-shaped measuring tube 2 to eliminate welding stress.

[0032] In this example, the U-shaped measuring tube 2 has a size of 5*1 mm and is made of Hastelloy C22. Hastelloy C22 has excellent resistance to hydrogen embrittlement and, after solution treatment, can reduce the possibility of intergranular corrosion. Hastelloy C22 also has a high allowable stress, meaning that the pipe wall can be relatively thin under high-pressure conditions. This helps to enhance the Coriolis force effect when the fluid flows through the U-shaped measuring tube 2, thereby improving measurement accuracy. Furthermore, the flow divider 6 and the high-pressure threaded connector 7 are also made of Hastelloy C22.

[0033] In some examples, a plurality of threaded holes 9 for mounting and positioning are machined on three surfaces around the chassis 8 for mounting and fixing the chassis 8 .

[0034] The working principle of this utility model is:

[0035] The high-pressure threaded joint 7 passes through the chassis 8 and is directly connected to the diverter 6, which prevents the chassis 8 from contacting hydrogen. Therefore, the chassis 8 can use a cheaper material, such as 304 stainless steel, which greatly reduces the production cost. In addition, compared with the traditional technology, the high-pressure threaded joint 7 is welded to the chassis 8 in a more compact way, saving space while ensuring the stability of the structure.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure mass flow meter for a hydrogenation machine, characterized in that: It includes a sensor housing (1) and a chassis (8) mounted on the bottom of the sensor housing (1); Two groups of U-shaped measuring tubes (2) are provided in the middle of the inner side of the sensor housing (1), and the two groups of U-shaped measuring tubes (2) are symmetrically distributed at the two inner ends of the sensor housing (1). A driver (3) is provided on the top of each of the two groups of U-shaped measuring tubes (2), a signal collector (4) is provided at the bend of the U-shaped measuring tube (2), and a shock-absorbing plate (5) is provided at the bottom of the U-shaped measuring tube (2); A flow divider (6) is provided on one side of the upper end of the chassis (8), and the air inlet ends of the two sets of U-shaped measuring tubes (2) are respectively connected to the outlet ends of the flow divider (6). The flow divider (6) is fixedly mounted on the middle part of the upper end of the chassis (8) through a high-pressure threaded joint (7), and the flow divider (6) and the high-pressure threaded joint (7) are welded into a whole. An air outlet (10) and an air inlet (11) are respectively provided on both sides of the bottom end of the chassis (8); the air inlet (11) is connected to the diverter (6); and the air outlet (10) is connected to the outlet ends of the two sets of U-shaped measuring tubes (2).

2. A high-pressure mass flowmeter for a hydrogenation machine according to claim 1, characterized in that: The shock-absorbing sheet (5) is configured as a double-layer structure.

3. A high-pressure mass flow meter for a hydrogenation machine according to claim 2, characterized in that: The side end surface of the chassis (8) is provided with multiple groups of threaded holes (9).

4. A high-pressure mass flowmeter for a hydrogenation machine according to claim 3, characterized in that: The U-shaped measuring tube (2) and the diverter (6) are fixed by welding.

5. A high-pressure mass flow meter for a hydrogenation machine according to claim 4, characterized in that: The U-shaped measuring tube (2) and the shock-absorbing plate (5) are fixed by welding.

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