JPH04224399A - High pressure gas filling up device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for filling cylinders of natural gas vehicles with high pressure gas, such as high pressure natural gas.

0002

[Prior Art] A conventional high-pressure gas filling device is shown in Fig. 3.
As shown in the figure, a manual adjustment shutoff valve 4 and a pressure gauge 5 are attached to the filling line 3 connecting the pressure accumulator 1 and the cylinder 2, and an operator manually operates the manual adjustment shutoff valve 4 while looking at the pressure gauge 5. In the pressure filling method (manual filling method), as shown in Fig. 4, a shutoff valve 5, a flow rate adjustment valve 6, a flow rate detection end 7, and a pressure detection end 8 are attached to the filling line 3, and the flow rate detection end 7 controls the flow rate. The flow control valve 6 is automatically controlled while detecting the pressure detection end 8.
There is a known automatic filling method in which the shutoff valve 5 is automatically shut off when a predetermined pressure is detected.

0003

However, the above-mentioned known technology has the following problems. a. In the case of manual filling, a large flow rate flows at the beginning of filling due to a large differential pressure, and a small flow rate occurs at the end of filling due to a small differential pressure, which takes time to fill. b. In the case of the automatic filling method, the above-mentioned drawbacks are improved, but if the filling flow rate setting is not changed for each cylinder capacity, the pressure will rise rapidly for small-capacity cylinders, and for large-capacity cylinders, Since it takes too much time, it is necessary to change the settings for each cylinder capacity. c. In the case of the automatic filling method, a large pressure loss occurs in the piping and valves on the filling side, so the pressure detected by the pressure detection end 8 reaches the predetermined level before the pressure inside the filling cylinder reaches the predetermined filling pressure. A problem arises in that the filling pressure is reached and the shutoff valve 5 is automatically shut off before the tank is full.

An object of the present invention is to provide a high-pressure gas filling device that automatically fills a cylinder to a predetermined pressure while controlling the pressure to rise at a constant rate regardless of the capacity of the cylinder to be filled. .

[0005]

[Means for Solving the Problems] The structure of the present invention is as follows.

A pressure regulating valve, a shutoff valve, and a pressure detection end are attached to the high pressure gas filling line, and a filling switch O is installed.
Open the shutoff valve with N, open the pressure control valve slightly to start filling with high pressure gas, set the pressure detected at the pressure detection end as the filling start pressure, and start filling according to a preset pressure gradient or rising curve. After that, a filling target pressure is set every time the time elapses, and the actual pressure detected at the pressure detection end is compared with this filling target pressure, and the opening degree of the pressure regulating valve is adjusted so that the actual pressure becomes the target pressure. A high-pressure gas filling device that is equipped with a controller that performs calculations, settings, and controls to close a shutoff valve and a pressure regulating valve after the actual pressure reaches a predetermined pressure.

[0007]

[Operation] After connecting the filling line to the filling connection port and turning on the operation switch, the controller first opens the shutoff valve and
Slightly open the pressure control valve. This starts a small amount of filling, but the pressure at the pressure detection end at this time becomes almost equal to the residual pressure of the cylinder because almost no pressure loss occurs in the filling line leading to the cylinder. The controller detects this pressure and sets it as the filling start pressure, sets the filling target pressure every time after starting filling according to a preset pressure gradient or rising curve, and compares it with the actual pressure at the pressure detection end. Calculate and set the opening degree of the pressure control valve. In addition, after the target filling pressure reaches the predetermined filling pressure, the target pressure remains constant, so the differential pressure with the actual filling pressure becomes small. As a result, the opening degree of the pressure regulating valve also becomes smaller. As a result, the flow rate at the end of filling becomes extremely small, and filling ends after the pressure inside the cylinder reaches approximately a predetermined filling pressure. Then, when the pressure detected at the pressure detection end becomes a constant pressure, the shutoff valve and the pressure control valve are closed to complete the filling.

[0008]

Embodiment FIG. 1 shows an embodiment of the present invention.

Reference numeral 1 is a pressure accumulator, 2 is a cylinder, 3 is a filling line, 10 is a cutoff valve, 11 is a pressure regulating valve, 12 is a pressure detection end, and 13 is a controller, and this controller 13 is used for filling. The pressure gradient or pressure rise curve to be generated can be input in advance, and based on this input, the opening degree of the pressure regulating valve 11 is controlled while monitoring the filling pressure at the pressure detection end 12. Specifically, It is as follows.

When the operation switch for starting filling is turned on, the controller 13 first opens the shutoff valve 10 and then closes the pressure regulating valve 1.
1 is a slight opening. As a result, a small amount of filling is started, and the pressure at the pressure detection end 12 at this time becomes approximately equal to the residual pressure of the cylinder 2 because almost no pressure loss occurs in the filling line 3 leading to the cylinder 2. The controller 13 detects this pressure, sets it as the filling start pressure, sets the filling target pressure every time after starting filling according to a preset pressure gradient or rising curve, and also sets the filling target pressure at each time interval after starting filling. By comparison, the opening degree of the pressure regulating valve 11 is calculated and set. As shown in FIG. 2, the opening degree of the pressure regulating valve is determined based on the set filling target pressure P1 and pressure detection end 1.
Proportional to the differential pressure h with P2 currently detected at step 2, or h
is set as the main variable. When the pressure detected by the pressure detection end 12 becomes a constant pressure, the shutoff valve 10 and the pressure control valve 11 are closed to complete the filling.

[0011]

Effects of the Invention As described above, the present invention automatically detects the filling start pressure using the controller, sets the filling target pressure for each filling elapsed time according to a predetermined pressure gradient or rise curve, and The opening degree of the pressure control valve is calculated and set by comparing the value with the actual filling pressure, and filling is terminated when the actual measured pressure reaches a predetermined pressure, so it can be used for any cylinder capacity. Automatic control is also possible to maintain a constant pressure gradient. In addition, after the target filling pressure reaches the predetermined filling pressure, the target pressure remains constant, so the differential pressure with the actual filling pressure becomes small, and is proportional to this differential pressure or is calculated and controlled as a main variable. The opening degree of the pressure regulating valve also decreases. As a result, the flow rate at the end of filling becomes extremely small, so that filling can be completed after the pressure inside the cylinder reaches approximately a predetermined filling pressure. For this reason, a. Even small capacity cylinders can be filled appropriately in a short time. b. Even large-capacity cylinders can be appropriately filled in a short time by utilizing the maximum capacity of the filling device. c. There is no need to change settings for each cylinder capacity. d. The filling equipment requires only a pressure control valve and a pressure detection end, and is extremely simple in configuration.

The following effects can be expected.

[Brief explanation of the drawing]

FIG. 1 is an embodiment diagram of the present invention.

FIG. 2 is an explanatory diagram of the operation of the controller.

FIG. 3 is an explanatory diagram of a manual filling method.

FIG. 4 is an explanatory diagram of an automatic filling method.

[Explanation of symbols]

1 Pressure accumulator 2 Cylinder 3 Filling line 10 Shutoff valve 11 Pressure control valve 12 Pressure detection end 13 Controller

Claims (1)

[Claims] Claim 1: Attach a pressure regulating valve, a shutoff valve, and a pressure detection end to a high-pressure gas filling line, open the shutoff valve by turning on a filling switch, open the pressure regulating valve slightly to start filling with high-pressure gas, and set the pressure The pressure detected at the detection end is taken as the filling start pressure, and the filling target pressure is set every time after the start of filling according to a preset pressure gradient or rise curve, and the actual pressure detected at the pressure detection end and this The opening degree of the pressure regulating valve is calculated and set so that the actual pressure reaches the target pressure by comparing it with the filling target pressure, and the shutoff valve and pressure regulating valve are closed after the actual pressure reaches the predetermined pressure. A high-pressure gas filling device equipped with a controller for control.