JP3074670U - Refrigerant recovery valve - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even if the recovery container is overfilled and the recovery container is exposed to the danger of being damaged, it is possible to prevent the damage beforehand and to prevent the worker and the surrounding people from being damaged. An object of the present invention is to provide a valve for a refrigerant recovery container that can ensure safety and minimize the dissipation of once collected Freon and the like. A relief valve (11) is provided on a valve body (1) having at least a liquid phase filling portion (2), and the relief valve (11) has an air vent passage opened by abnormal pressure in a collection container. It is characterized by. The relief valve 1
1 is a housing having an opening at the bottom surface, a spring loaded in the housing, and slidably inserted into the housing and constantly pressed by the spring to close the opening, A valve body that opens therewith due to abnormal pressure in the collection container. One or more air bleeding paths are formed in the upper half of the housing, and the confirmation chip 18 is fitted therein so that it can pop out. Features.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a valve for a refrigerant recovery container, and more particularly, to a valve used for a recovery container for recovering a liquefied gas refrigerant such as chlorofluorocarbon (hereinafter referred to as “CFC”) in a liquid phase.

[0002]

[Prior art]

 Fluorocarbons have become a global environmental problem because they destroy the ozone layer, which cuts the harmful ultraviolet rays that fall on the earth's surface. In general, chlorofluorocarbons are collected in a high-pressure state as a liquid refrigerant in a collection container in consideration of the economics and efficiency of work, or a combined method with both functions of liquid recovery and gas recovery Has been adopted.

FIG. 4 shows an example of the configuration of a conventional refrigerant recovery container (cylinder) using a two-port valve, which is provided with a two-port valve 32 and a float switch 33 in a cylinder 31. The two-port valve 32 is used in the above-described combined system. As shown in FIG. 5, a valve body 34 is provided with a liquid phase filling section 35 and a gas phase filling section 36, and a siphon is provided on the liquid phase filling section 35 side. A pipe 37 is attached.

[0004] In the recovery of CFCs, particular attention should be paid to overfilling. In other words, if the filling exceeds the specified filling amount, the container will be damaged due to the temperature rise etc. and the container will be damaged, and not only will the human body be harmed, but also the collected Freon gas etc. will be scattered in the air. Becomes

[0005] For example, for a 21-liter recovery vessel whose filling volume is limited to 90% or less of its internal volume, Freon (CFC12) is allowed to fill up to 25.3 kg at 16 ° C. However, when the ambient temperature reaches 52 ° C. at this filling amount, the entire inside of the recovery container is filled by volume expansion, and when the temperature further rises to 58 ° C., the container bursts.

[0006] As means for preventing the rupture of the recovery container, a float switch 33 is provided, which measures the liquid level of the refrigerant and detects that the liquid level has reached a set level. As a result, a method of automatically stopping the collection operation (liquid level detection method) has been adopted to ensure safety. In addition, a fusible plug 38 is provided, which melts and opens as the temperature rises due to the overfilled high pressure state in the collection container.

However, in consideration of safety, the set liquid level is set with a sufficient margin. Therefore, when the collection is stopped when the set level is reached, the collection container still has a considerable amount of filling. The filling efficiency is very poor because of the space left. For this reason, it is not unusual to perform an illegal operation such as removal of the float switch 33 and to perform considerably more filling than the set level. In addition, the fusible plug 38 does not open at 52 ° C. when the CFC 12 exemplified above is full.

[0008]

[Problems to be solved by the invention]

 As described above, conventional collection containers have been provided with overfilling prevention measures as a safety measure, but since they are easy to remove (cancel), they can be removed from the viewpoint of filling efficiency and fraudulent. Overfilling was not uncommon and dangerous. In addition, there were problems that the overfill prevention means was liable to break down, and that some overfill prevention means did not operate at the temperature at which the collection container bursts.

Therefore, the present invention does not have such a problem, that is, even if the recovery container is overfilled and the container is exposed to a danger of being damaged, the container can be prevented from being damaged. It is an object of the present invention to provide a valve for a refrigerant recovery container that can ensure the safety of a trader and the people around him and minimize the loss of once collected Freon and the like.

[0010]

Means for Solving the Problems The present invention comprises a relief valve installed at least in a valve body having a liquid phase filling portion, and the relief valve has an air vent passage opened by abnormal pressure in the recovery container. The above object has been achieved by a refrigerant recovery container valve characterized by having the above. The relief valve includes a housing having an opening at a bottom surface, a spring inserted into the housing, and a slidably inserted into the housing and constantly pressed by the spring to open the opening. A valve body that closes and opens due to abnormal pressure in the collection container. One or more of the air bleeding paths are formed in the upper half of the housing, into which the confirmation chip can protrude. It is characterized by being done.

[0011]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a case where the valve according to the present invention is configured as a two-port valve. In FIG. The phase filling unit 2 is used as the gas phase filling unit 3 on the other side.

A liquid filling port 5 that is opened and closed by operating a handle 4 is formed in the liquid phase filling section 2. A liquid introduction passage 6 that passes through the liquid phase filling section 2 from the liquid filling port 2 and vertically passes through the valve body 1 is formed. Is done. Then, a siphon pipe 7 is connected to the liquid introduction path 6. The gas phase filling section 3 is formed with a gas filling port 9 which is opened and closed by operating the handle 8, and a gas introduction path 10 is formed from the gas filling port 9, which passes through the gas phase filling section 3 and extends vertically through the valve body 1.

Reference numeral 11 denotes a relief valve which is provided by being screwed between the liquid phase filling section 2 and the gas phase filling section 3. As shown in FIG. 3, the relief valve 11 includes a cylindrical housing 12 having a male threaded lower half, and a valve body 13 slidably incorporated between the housings 12. The valve 13 opens and closes an opening 14 formed in the bottom surface of the housing 12, and is normally urged by a spring 15 to close the opening 14. The spring 15 is held down by a spring seat 16 screwed into the housing 12 from above.

In the upper half of the housing 12, one or a plurality of air vent paths 17 for communicating the inside and outside are formed, and a chip 18 made of plastic, rubber, or the like is fitted in an airtight state. The air vent path 17 is preferably formed diagonally downward as shown. A gas passage 19 communicating with the opening 14 of the housing 12 and communicating with the gas introduction passage 10 is formed in the gas filling section 3.

In FIG. 2, a fusible plug 20 melts at a predetermined temperature and opens in the axial direction. The fusible plug 20 is screwed so as to close the outer opening of the gas passage 21 provided in the valve body 1 in communication with the gas introduction passage 10. Reference numeral 22 in FIG. 3 denotes a set screw for the spring seat 16.

The refrigerant recovery container valve is attached to the refrigerant recovery container and used in the same manner as the conventional one. If the temperature of the refrigerant recovery container rises in a state in which the recovery liquid is overfilled by the worker's intention or due to a failure of the float switch or the like, the abnormal pressure in the container increases the gas introduction passage 10, the gas passage 19 and the opening. The valve body 13 is applied to the valve body 13 via the portion 14, and the valve body lifting force due to the abnormal pressure exceeds the valve body pressing force of the spring 15, and the valve body 13 slides upward to open the opening 14.

With the above operation of the valve body 13, abnormal pressure is applied to the check chip 18, and the chip 18 jumps out of the air vent path 17 and opens the air direction path 17. Thus, the abnormal pressure in the collection container is eliminated, and there is no danger of rupture. Further, the worker checks whether or not the check tip 18 is present in the air bleeding path 17 to determine whether or not the container is in an overfilled state and is at risk of rupture. Can be confirmed.

The check tip 18 jumps out with considerable force in a dangerous situation. However, if the air vent path 17 is directed obliquely downward, the possibility of injury to an operator or the like is considerably reduced.

[0019]

[Effect of the invention]

 Since the present invention is as described above, even if the recovery container is overfilled and the recovery container is exposed to the risk of damage, the excess pressure in the cylinder is released by the popping out of the check chip and the recovery is performed. This has the effect of preventing damage to the container beforehand, ensuring the safety of workers and those around them, and minimizing the dissipation of once collected Freon. According to the third aspect of the present invention, there is an effect that danger at the time of popping out the confirmation chip is avoided.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of a valve according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a longitudinal sectional view showing a mechanism of the relief valve of the valve according to the present invention.

FIG. 4 is a perspective view of a conventional refrigerant recovery container.

FIG. 5 is a cross-sectional view showing a configuration of a conventional refrigerant recovery container valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Liquid phase filling part 3 Gas phase filling part 4 Handle 5 Liquid filling port 6 Liquid introduction path 7 Siphon tube 8 Handle 9 Gas filling port 10 Gas introduction path 11 Relief valve 12 Housing 13 Valve body 14 Opening 15 Spring 16 Spring seat 17 Air release path 18 Confirmation tip 19 Gas passage 20 Fusible plug 21 Gas passage 22 Set screw

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FIF24F 5/00 F24F 5/00 N (72) Inventor Hidenobu Oda 1-2-16 Kawaguchi, Nishi-ku, Osaka City ) Inventor Shozo Kanai 1-12-11 Funato, Itabashi-ku, Tokyo Suzuki Shosha Co., Ltd. (72) Inventor Masakazu Okubo 1318 Ojihara-shi, Ageo-shi, Saitama

Claims (3)

[Utility model registration claims] A relief valve is provided on a valve body having at least a liquid-phase filling portion, wherein the relief valve has an air vent passage opened by abnormal pressure in a collection container. For a refrigerant recovery container to be used. 2. A relief valve having an air vent passage opened by abnormal pressure in a recovery container is provided on a valve body having at least a liquid phase filling portion, and the relief valve has an opening on a bottom surface. A housing, a spring loaded in the housing, and the opening is closed by being slidably inserted into the housing and constantly pressed by the spring, and the opening is closed by abnormal pressure in the collection container. A valve for a refrigerant recovery container, comprising one or more air vent paths formed in an upper half portion of the housing, into which a confirmation chip is protruded. 3. The refrigerant recovery container valve according to claim 1, wherein the air vent path is formed obliquely downward.