CN205173982U - Switching -over valve formula quality method cryogenic liquids flow rate standard facility - Google Patents

Abstract

The utility model discloses a reversing valve type quality method cryogenic liquid flow standard device, which comprises a gas storage container, a liquid addition interface, a gas return interface, a circulation interface, a circulation electromagnetic valve, a liquid phase electromagnetic valve and a gas phase electromagnetic valve, and a gas storage container. The container is provided with a one-way liquid inlet valve and an air return valve; the liquid phase solenoid valve is connected in series between the liquid filling interface and the one-way liquid inlet valve, and the gas phase electromagnetic valve is connected in series between the air return valve and the air return interface; The interface is connected to the pipeline between the liquid filling interface and the liquid phase solenoid valve through a circulation pipeline, and the circulation solenoid valve is connected in series on the circulation pipeline. This device reduces the error caused by the need to stop the filling operation of the gas filling machine before filling in the quality method test process, and the liquid filling gun is inserted into the liquid filling interface and automatically opens without measuring the gas filling machine; when the liquid filling operation is stopped, it passes The synchronization of the low-temperature electromagnetic valve cutting off operation is much better than that of drawing the gun, so as to ensure that the state of the liquid in the hose and the state of the pipeline on the gas storage container are as consistent as possible before and after filling.

Description

Reversing valve mass method cryogenic liquid flow standard device

technical field

The utility model relates to a low-temperature liquid flow standard device, in particular to a reversing valve type mass method low-temperature liquid flow standard device.

Background technique

The quality method cryogenic liquid flow standard device is the main equipment for the type evaluation test of the liquefied natural gas dispenser specified in the national technical specification JJF1524-2015 "Type Evaluation Outline of Liquefied Natural Gas Dispenser". It is used to test whether its metering performance can meet specification requirements. The device is generally composed of a fluid source, a test pipeline system, a standard device (electronic balance) and auxiliary equipment. One of the most important auxiliary equipment is the gas storage container, which is a vacuum insulated cryogenic pressure vessel used to store the test fluid medium (usually liquid nitrogen). At present, the gas storage containers produced and processed on the market generally have a liquid inlet, an air return port and a discharge port. The liquid inlet is designed as a one-way valve. As long as the liquid filling gun is inserted into the gas storage container, a certain pressure difference will be generated. , the valve opens automatically. During the test, after peeling and weighing the empty gas storage container, insert the liquid filling gun into the liquid inlet of the gas storage container, and start the liquefied natural gas dispenser to add liquid. Since the gas storage container is close to a vacuum, the pressure is low, and the pressure at the end of the liquid filling gun is high. The tare weight of the gas storage container changes due to the gas storage container, that is, the gas storage container has been filled with liquid but the dispenser has not yet started metering. Through experiments, the quality of this part of liquid nitrogen may even reach more than 5kg. When the filling machine stopped adding liquid, the same problem also existed because the liquid filling gun could not break away from the gas storage container immediately. This part of the additional filling quality has a great influence on the test results. Although the quality of this part can be estimated through a large number of tests, because the hose from the gas dispenser to the liquid gun is long, and this section is also easy to gasify, the quality of the additional filling is related to the state of the liquid in the tube, so It is difficult to make an accurate estimate. It is precisely because of this part of the influence that the repeatability in the actual mass method detection is very poor. Therefore, how to solve the problem of synchronization between the metering of the gas dispenser and the start and stop of the filling action of the gas storage container is the key to solve the problem of using the mass method cryogenic liquid flow standard device to detect the LNG gas dispenser.

Utility model content

Aiming at the above-mentioned deficiencies in the prior art, the utility model provides a reversing valve-type mass method low-temperature liquid flow standard device, which solves the problem of synchronization between the metering of the gas dispenser and the start and stop of the filling action of the gas storage container, And try to minimize the impact of liquid nitrogen vaporization caused by the start and stop of the gas dispenser on the measurement results, so as to solve the problems of poor repeatability and difficult to guarantee measurement accuracy of the LNG gas dispenser detected by the quality method cryogenic liquid flow standard device.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

The reversing valve type quality method cryogenic liquid flow standard device includes a gas storage container, a liquid filling interface, a gas return interface, a circulation interface, a circulation solenoid valve, a liquid phase solenoid valve and a gas phase solenoid valve. The gas storage container is equipped with a single to the liquid inlet valve and the air return valve; the liquid phase solenoid valve is connected in series between the liquid filling interface and the one-way liquid inlet valve, and the gas phase electromagnetic valve is connected in series between the air return valve and the air return interface; the The circulation interface is connected to the pipeline between the liquid addition interface and the liquid phase solenoid valve through a circulation pipeline, and the circulation solenoid valve is connected in series on the circulation pipeline.

As a preferred solution of the present invention, the gas storage container is placed on an electronic scale.

The beneficial effects of the utility model are: through the refitting of the gas storage container of the low-temperature liquid flow standard device of the mass method, three low-temperature solenoid valves (namely circulation solenoid valves, liquid-phase solenoid valves and gas-phase solenoid valves) and a circulation interface are added, Realized the reversing valve type quality method cryogenic liquid flow standard device, which reduced the need to stop the filling operation of the gas dispenser before filling during the quality method test, and the liquid filling interface automatically opened when the liquid filling gun was inserted into the gas storage container. The error caused by the non-metering of the gas dispenser; when the liquid filling operation is stopped, it is much better to cut off through the low-temperature solenoid valve than to draw the gun. At the same time, the reversing valve design makes the hose between the dispenser and the filling gun always in the filling state, avoiding the gasification of liquid nitrogen in this section of the hose caused by the shutdown operation, thus ensuring Try to be consistent with the state of the liquid in the hose and the state of the pipeline on the gas storage container after adding liquid.

Description of drawings

Fig. 1 is a structural schematic diagram of a reversing valve mass method cryogenic liquid flow standard device.

In the accompanying drawings, 1—air storage container; 2—liquid filling interface; 3—air return interface; 4—one-way liquid inlet valve; 5—air return valve; 6—circulation interface; 7—circulation solenoid valve; 8—liquid phase solenoid valve; 9—gas phase solenoid valve; 10—electronic scale; 11—liquid nitrogen storage tank; 12—cryogenic submersible pump; 13—gas dispenser.

detailed description

The utility model is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the reversing valve mass method cryogenic liquid flow standard device includes a gas storage container 1, a liquid filling interface 2, a gas return interface 3, a circulation interface 6, a circulation solenoid valve 7, a liquid phase solenoid valve 8 and a gas phase solenoid valve. Valve 9. The gas storage container 1 is provided with a one-way liquid inlet valve 4 and an air return valve 5 . The liquid phase solenoid valve 8 is connected in series between the liquid filling port 2 and the one-way liquid inlet valve 4, the gas phase solenoid valve 9 is connected in series between the gas return valve 5 and the gas return port 3; the circulation port 6 is connected to the On the pipeline between the liquid filling interface 2 and the liquid phase solenoid valve 8, the circulation solenoid valve 7 is connected in series on the circulation pipeline. The gas container 1 is placed on an electronic scale 10 .

When using the reversing valve type mass method cryogenic liquid flow standard device, the liquid outlet of the liquid nitrogen storage tank 11 is connected to the liquid inlet of the cryogenic submersible pump 12 through a pipeline, and the liquid outlet of the cryogenic submersible pump 12 is connected to the liquid inlet of the cryogenic submersible pump 12. The liquid inlet of filling machine 13 is connected. The utility model refits the gas storage container of the low-temperature liquid flow standard device of the quality method, and adds three low-temperature electromagnetic valves (that is, the circulation electromagnetic valve 7, the liquid phase electromagnetic valve 8 and the gas phase electromagnetic valve 9) on the gas storage container 1, and Add a circulation interface 6 on the gas storage container 1 . Three low-temperature solenoid valves are respectively installed on the liquid feeding port 2, the air return port 3, and a circulation pipeline added between the liquid inlet port 2 and the circulation port 6. The test process and steps are as follows:

1. Pre-cooling. Pre-cooling includes pre-cooling of test pipelines, liquefied natural gas dispensers and gas storage containers. The pre-cooling of the test pipeline and the dispenser can be pre-cooled through the preset circulation pipeline, and the pre-cooling of the gas storage container needs to be carried out by continuously filling and emptying liquid nitrogen.

2. Tare. After the pre-cooling is over, turn off the cryogenic submersible pump and the gas filling switch on the gas dispenser, remove the liquid filling gun from the gas storage container, and weigh the empty gas storage container.

3. Add liquid circulation process. Insert the liquid filling gun and the liquid return gun into the liquid inlet port and the circulation port of the gas storage container respectively, connect the solenoid valve cable, start the cryogenic submersible pump and the gas filling switch of the gas dispenser, open the circulation solenoid valve, and release the liquefied natural gas. The gas filling machine and the pipeline are pre-cooled again.

Claims (2)

1. commutate valve type mass method cryogenic liquide flow standard set-up, and comprise air container (1), liquid feeding interface (2) and return-air interface (3), described air container (1) is provided with unidirectional liquid feed valve (4) and return-air valve (5); It is characterized in that: also comprise circulation interface (6), circulating electromagnetic valve (7), liquid phase solenoid valve (8) and gas phase solenoid valve (9), described liquid phase solenoid valve (8) is serially connected between liquid feeding interface (2) and unidirectional liquid feed valve (4), and described gas phase solenoid valve (9) is serially connected between return-air valve (5) and return-air interface (3); Described circulation interface (6) is connected on the pipeline between liquid feeding interface (2) and liquid phase solenoid valve (8) by circulation loop, and described circulating electromagnetic valve (7) is serially connected on circulation loop.

2. commutation valve type mass method cryogenic liquide flow standard set-up according to claim 1, it is characterized in that, described air container (1) is placed on electronic scale (10).