JP4803788B2 - Carbon dioxide filling device - Google Patents

Description

  The present invention relates to a carbon dioxide gas filling device that fills carbon dioxide gas used as a refrigerant.

  Conventionally, when a chlorofluorocarbon refrigerant is charged into a refrigerator or the like, a liquefied refrigerant is accumulated in a cylinder, and the refrigerant accumulated in the cylinder is pressurized and injected by a piston.

Such a filling method can be used with a fluorocarbon refrigerant whose density is relatively stable with respect to temperature. However, due to temperature changes such as carbon dioxide, the phase state is unstable and the density change is large. With physical properties, it is difficult to control the filling amount.
In addition, when carbon dioxide gas is continuously charged, it is difficult to manage the temperature of the cylinder, and a cooling process of the cylinder is inevitably generated after the end of one cycle, and it is difficult to control the filling amount. There was a drawback that the gas in the carbon dioxide container could not be used sufficiently.
nothing special

  In view of the above-mentioned conventional drawbacks, the present invention is a carbon dioxide gas capable of accurately filling a predetermined amount even with carbon dioxide gas having physical properties that are unstable in phase state and large in density change due to a change in temperature. The object is to provide a filling device.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

In order to achieve the above object, the present invention supplies a liquefied carbon dioxide gas container and a liquefied carbon dioxide gas supply to a nozzle for filling the liquefied carbon dioxide gas from the liquefied carbon dioxide gas container with a filling valve on the filling nozzle side. A gas-liquid separator that supplies only the liquefied carbon dioxide gas interposed in the liquefied carbon dioxide supply path, and a pressure pump interposed in the liquefied carbon dioxide supply path downstream of the gas-liquid separator; , A mass flow meter for measuring the amount of liquefied carbon dioxide filled in the liquefied carbon dioxide supply path downstream of the pressurizing pump, which is filled with the filling nozzle, the mass flow meter, and the Carbonated in a circulation path with a back pressure valve interposed at one end in the liquefied carbon dioxide supply path between the filling valve and the other end at the gas side of the gas-liquid separator. It constitutes a gas filling device.

  As will be apparent from the following description, the present invention has the following effects.

(1) A liquefied carbon dioxide gas container, a liquefied carbon dioxide gas supply path for supplying a liquefied carbon dioxide gas from the liquefied carbon dioxide gas container to a nozzle filled with a filling valve on the filling nozzle side, and the liquefied carbon dioxide gas supply A gas-liquid separator for supplying only the liquefied carbon dioxide gas interposed in the passage, a pressure pump interposed in the liquefied carbon dioxide gas supply path downstream of the gas-liquid separator, and a downstream of the pressure pump A mass flow meter that is interposed in the liquefied carbon dioxide supply path and measures a filling amount of liquefied carbon dioxide gas filled in the filling nozzle, and between the mass flow meter and the filling valve, Since one end is interposed in the liquefied carbon dioxide supply path and the other end is interposed in the gas side of the gas-liquid separator, a back pressure valve is interposed in the circulation path. Since the carbon dioxide flowing when filling the road is measured with a mass flow meter, it is accurate. It is possible to measure the loading of carbon dioxide gas Hama.
Therefore, the filling amount of carbon dioxide gas into the filling can be made uniform, and the quality can be improved.

(2) According to the above (1), even if it is continuously filled, a cooling step is not required as in the prior art, and one cycle is short and filling can be performed efficiently.

(3) According to the above (1), the structure is simple and can be easily manufactured.

(4) According to the above (1) , it is possible to efficiently prevent intrusion of substances other than carbon dioxide when filling with carbon dioxide.

(5) According to the above (1), the pressure pump can always be filled at a constant pressure flow rate, and an accurate amount of liquefied carbon dioxide gas can be filled.

(6) By said (1), a liquefied carbon dioxide gas can be efficiently flowed through a liquefied carbon dioxide supply path with a gas-liquid separator, and more accurate liquefied carbon dioxide gas can be filled.

(7) According to the above (1) , the liquefied carbon dioxide gas can be filled accurately.

  Hereinafter, the present invention will be described in detail by means of a carbon dioxide gas filling device considered by the present inventor and the best mode for carrying out the invention shown in the drawings.

  In the carbon dioxide filling apparatus considered by the present inventor shown in FIGS. 1 to 3, carbon dioxide of the present invention is capable of uniformly filling a predetermined amount into a refrigerator 2 using carbon dioxide as a refrigerant. This carbon dioxide filling device 1 has one end connected to a carbon dioxide container 3 in which a cylinder is filled with gas or liquid carbon dioxide, and an on-off valve 4 of the carbon dioxide container 3, and the other end. The carbon dioxide gas supply path 6 in which the refrigerating machine 2 is filled with carbon dioxide gas is attached, a carbon dioxide gas supply path 6, a filling valve 7 interposed in the carbon dioxide gas supply path 6 near the filling nozzle 5, and this filling Highly accurate flow rate with low pressure loss, less affected by changes in temperature, pressure and density of carbon dioxide gas flowing through the carbon dioxide gas supply channel 6 upstream of the carbon dioxide gas supply channel 6 near the valve 7 Coriolis quality that can be measured A flow meter 8; an on-off valve 9 interposed in the carbon dioxide gas supply passage 6 upstream of the mass flow meter 8; and the carbon dioxide gas supply passage between the on-off valve 9 and the mass flow meter 8 6 and a vacuum device 13 including a vacuum pump 12 having an opening / closing valve 11 interposed in a suction pipe 10 for evacuating the downstream of the opening / closing valve 9.

The carbon dioxide filling device 1 having the above configuration connects the filling nozzle 5 and a refrigerant supply path (not shown) of the refrigerator 2 in a sealed state.
Thereafter, the on-off valve 9 of the carbon dioxide gas supply path 6, the on-off valve 11 of the suction pipe 10 and the filling valve 7 are opened, and the vacuum pump 12 is actuated to operate the carbon dioxide gas supply path 6 and the refrigerant supply path of the refrigerator 2 (see FIG. Vacuum).

  Next, the opening / closing valve 11 of the suction pipe 10 is closed, the opening / closing valve 4 of the carbon dioxide container 3 is opened, and the filling valve 7 is closed when the preset filling amount is measured by the mass flow meter 8. Complete filling.

The opening and closing of the filling valve 7 is a control circuit that is controlled to automatically close when the filling amount preset by the mass flow meter 8 is reached, or a valve that opens and closes according to a command from the control circuit. .
In addition, the work of closing the on-off valve 9 of the carbon dioxide gas supply path 6 and evacuating the downstream of the on-off valve 9 is performed in the second and subsequent filling operations.

  Next, different forms of the carbon dioxide filling apparatus considered by the present inventor shown in FIGS. 4 to 7 and the best mode for carrying out the present invention will be described. In these descriptions, the same components as those in the above-described embodiment are denoted by the same reference numerals and redundant description is omitted.

  The carbon dioxide filling apparatus considered by the present inventor shown in FIG. 4 is mainly different from the carbon dioxide filling apparatus considered by the present inventor in that a liquefied carbon dioxide using a cylinder or storage tank capable of supplying liquefied carbon dioxide gas. A pressure pump 14 is provided in the gas container 3A and a liquefied carbon dioxide gas supply path 6A upstream of the mass flow meter 8, a cooling device 15 is provided upstream of the pressure pump 14, and a safety valve 16 is provided downstream of the pressure pump 14. The carbon dioxide gas filling device 1A configured as described above may be used in that the suction pipe 10 is interposed in the liquefied carbon dioxide gas supply path 6A between the filling valve 7 and the filling nozzle 5, and this carbon dioxide gas filling device. By setting 1A, more accurate carbon dioxide gas can be filled.

  The carbon dioxide gas filling device considered by the present inventor shown in FIG. 5 is mainly different from the carbon dioxide gas filling device in that a gas-liquid separator 17 is connected to the liquefied carbon dioxide gas supply path 6A upstream of the cooling device 15. The carbon dioxide gas filling device 1B configured as described above can provide the same operational effects as the carbon dioxide gas filling device considered by the inventor and liquefy the liquefied carbon dioxide gas supply path 6A. Only carbon dioxide can be flowed, and more accurate carbon dioxide can be filled.

  In the first embodiment for carrying out the present invention shown in FIG. 6, the main difference from the carbon dioxide filling device considered by the inventor is that liquefied carbon dioxide between one end 8 and the filling valve 7. This is configured in that a circulation path 20 provided with an open / close valve 18 and a back pressure valve 19 connected to the gas supply path 6A and having the other end connected to the gas side of the gas-liquid separator 17 is provided. Even with the carbon dioxide gas filling device 1C, more accurate carbon dioxide gas filling can be performed.

  The carbon dioxide filling device considered by the present inventor shown in FIG. 7 is mainly different from the carbon dioxide filling device considered by the inventor in that the internal volume from the refrigerator 2 to the on-off valve 9 is a refrigerator. If the capacity of the refrigerator 2 is small with respect to the internal volume of 2 and there is no problem, this may be done in that the carbon dioxide gas filling device 1D does not use a vacuum device.

  The present invention is used in the industry of manufacturing a carbon dioxide gas filling device for filling a predetermined amount of carbon dioxide gas.

The schematic explanatory drawing of the filling device of the carbon dioxide gas which this inventor considered. The principal part top view of the filling device of the carbon dioxide gas which this inventor considered. The principal part front view of the filling device of the carbon dioxide gas which this inventor considered. The schematic explanatory drawing of the different form of the filling device of the carbon dioxide gas which this inventor considered. The schematic explanatory drawing of the different form of the filling device of the carbon dioxide gas which this inventor considered. 1 is a schematic explanatory diagram of a first embodiment for carrying out the present invention. The schematic explanatory drawing of the different form of the filling device of the carbon dioxide gas which this inventor considered.

1, 1A, 1B, 1C, 1D: Carbon dioxide filling device,
2: refrigerator, 3, 3A: carbon dioxide container,
4: Open / close valve, 5: Filling nozzle,
6, 6A: Carbon dioxide gas supply path, 7: Filling valve,
8: Mass flow meter, 9: On-off valve,
10: suction pipe, 11: on-off valve,
12: vacuum pump, 13: vacuum device,
14: pressurizing pump, 15: cooling device,
16: Safety valve, 17: Gas-liquid separator,
18: On-off valve, 19: Back pressure valve,
20: Circulation path.

Claims (2)

A liquefied carbon dioxide container, a liquefied carbon dioxide supply path for supplying a liquefied carbon dioxide gas from the liquefied carbon dioxide gas container to a nozzle filled with a filling valve on the filling nozzle side, and a liquefied carbon dioxide gas supply path A gas-liquid separator for supplying only the liquefied carbon dioxide gas, a pressure pump provided in the liquefied carbon dioxide gas supply path downstream of the gas-liquid separator, and the liquefied carbon dioxide downstream of the pressure pump. A mass flow meter for measuring the filling amount of liquefied carbon dioxide gas filled in the filling nozzle inserted in a gas supply path, and the liquefied carbon dioxide gas between the mass flow meter and the filling valve A carbon dioxide gas filling device comprising: a circulation path having a back pressure valve interposed at one end portion in the supply path and at the other end interposed in the gas side of the gas-liquid separator. A vacuum device is provided that includes a vacuum pump that is interposed in a liquefied carbon dioxide gas supply path between a filling valve and a filling nozzle and that has an open / close valve that evacuates the downstream of the filling valve. The carbon dioxide filling device according to claim 1.

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