JPH0828792A - Refrigerant filled cylinder - Google Patents

Abstract

(57) [Abstract] [Purpose] When the refrigerant is charged into a device from a refrigerant-filled cylinder filled with a non-azeotropic mixed refrigerant, only the liquid refrigerant is charged to reduce the change in the composition of the charged refrigerant. [Structure] A liquid level detector and air supply / exhaust are provided in a refrigerant-filled cylinder 1 in which two or more kinds of non-azeotropic mixed refrigerants are sealed and a supply / exhaust port 2 having a first opening / closing valve 4 which can be opened / closed is provided. A second opening / closing valve consisting of a valve portion for opening and closing the mouth and a valve seat is provided, and when the inlet / outlet opening inlet portion is the liquid refrigerant, the detection position of the liquid level detector is equal to or more than the set value. A drive mechanism 6 is provided that is opened at times, closed at a set value or less, and closed at the gas inlet / outlet inlet regardless of the detection position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant filled cylinder, and more particularly to a refrigerant filled cylinder filled with a non-azeotropic mixed refrigerant.

[0002]

2. Description of the Related Art Refrigerant air-filling cylinders are used when storing or enclosing refrigerant in air-conditioning equipment. Such refrigerant-filled cylinders include Refrigeration and Air Conditioning Handbook, Vol. 6, Environment / Safety / Plant Technology. Second edition of the fifth edition: June 1993 edition)
Some are described on pages 67 to 271.

[0003]

However, the conventional techniques described in the above-mentioned documents have the following problems in order to protect the ozone layer.
Non-azeotropic mixed refrigerants that have been used in recent years, such as HF
C (abbreviation of hydrofluorocarbon) 32 / HFC13
4a or HFC32 / HFC125 / HFC134
No consideration is given to the problem in filling with a or the like. When the non-azeotropic mixed refrigerant is charged, there is a problem that the composition changes during gas-liquid equilibrium, and the composition of the gas refrigerant and the liquid refrigerant retained in the refrigerant-filled cylinder is different.

FIG. 5 shows HFC32 / HFC125 / HFC
The initial filling composition ratio of 134a is 23/25 /
5 shows the amount of refrigerant in a refrigerant-filled cylinder and the compositional change of HFC32 supplied to the device when a refrigerant is filled in a device from a 52% refrigerant-filled canister with a gas refrigerant and a liquid refrigerant. As can be seen from FIG. 5, when the gas refrigerant is supplied, the composition supplied to the device greatly differs from the initial composition filled in the refrigerant-filled cylinder, and the supply composition also differs depending on the amount of refrigerant in the refrigerant-filled cylinder. Further, when the liquid refrigerant is supplied, there is almost no difference from the initial composition unless the amount of the refrigerant in the refrigerant-filled cylinder is extremely small. Therefore, when the refrigerant is supplied from the refrigerant-filled cylinder to the device with the non-azeotropic mixed refrigerant, it is necessary to supply the liquid refrigerant in order to reduce the composition change.

An object of the present invention is to provide a refrigerant-filled cylinder capable of enclosing a refrigerant having a small composition change by supplying only a liquid refrigerant when enclosing a non-azeotropic mixed refrigerant in a device.

[0006]

To achieve the above object, the refrigerant-filled cylinder according to the present invention has a first opening / closing valve which is filled with at least two kinds of non-azeotropic mixed refrigerants and which can be opened and closed. A refrigerant-filled cylinder provided with a supply / exhaust port, wherein a liquid level detector is provided in the refrigerant-filled cylinder, and the liquid level detector includes a second valve section and a valve seat for opening / closing the supply / exhaust port. An open / close valve is provided, and the open / closed state of the second open / close valve is set to the open state when the inlet / exhaust port of the supply / exhaust port is liquid refrigerant and the detection position of the liquid level detector is equal to or more than a set value. Is a set value or less, a closed state is provided, and when the inlet / exhaust inlet inlet is a gas refrigerant, a gas refrigerant entrapment prevention device including a drive mechanism that is closed regardless of the detection position is provided.

Further, a supply / exhaust port provided with a siphon pipe reaching the lower part of the refrigerant charging cylinder, a liquid level detector composed of a float moving by the buoyancy of the liquid refrigerant, and one of which is always displaced in the direction of gravity and inside the siphon pipe A valve seat provided on the other side, and the other is composed of a valve portion that can come into contact with a lever that is displaced at the float position,
There is provided a gas refrigerant entrapment prevention device having a drive mechanism that biases the valve portion in a direction in which the valve portion abuts on the valve seat via a lever when the float reaches a position below a set value. or,
A supply / exhaust port provided with a siphon tube made of a non-magnetic material that reaches the lower part of the refrigerant-filled cylinder, a liquid level detector including a float that moves by the buoyancy of the liquid refrigerant and has a magnet inside, and a siphon One of the valve seat provided in the pipe and the valve seat is in contact with the other, and the other is a valve part capable of contacting the valve part restrainer
When the distance between the float and the valve portion is less than a set value, the valve portion is biased toward the valve seat by the attraction force of the magnet in the float, and when the distance is greater than the set value, it is biased by gravity. A gas refrigerant encapsulation prevention device having a drive mechanism that operates is provided.

[0008]

As described above, the second opening / closing valve including the liquid level detector, the valve portion for opening / closing the supply / exhaust port, and the valve seat is provided, and the opening / closing of the second opening / closing valve is controlled by the inlet / exhaust port inlet portion. Drive mechanism that is open when the detection position of the liquid level detector is above the set value for refrigerant, closed when it is below the set value, and closed regardless of the detection position when the inlet / outlet inlet is gas refrigerant By providing the gas refrigerant encapsulation prevention device consisting of, the second on-off valve is closed and the supply of the refrigerant is stopped when the inlet / outlet port inlet portion is the gas refrigerant. Further, even if the amount of the refrigerant in the refrigerant charging cylinder decreases and the liquid level decreases, the second on-off valve closes and the supply of the refrigerant stops. Therefore, since the inlet / outlet opening is opened only when the liquid refrigerant is used, only the liquid refrigerant is sealed and the change in the composition of the sealed refrigerant can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical cross-sectional view showing the structure of a refrigerant-filled cylinder according to the present embodiment, and FIG. 2 is an enlarged vertical cross-sectional view of the gas refrigerant filling prevention device shown in FIG.

In FIG. 1 and FIG. 2, a refrigerant-filled cylinder 1 having a non-azeotropic refrigerant filled therein is constructed as follows. The first refrigerant supply / exhaust port 2 has a first connection joint 3,
A manual first on-off valve 4, a siphon pipe 5, and a gas refrigerant encapsulation prevention device 6 (details will be described later). The second refrigerant supply / exhaust port 7 has a shape different from that of the first connection joint 2. Two
The connecting joint 8 and the second manual on-off valve 9 are connected. The gas filling prevention device 6 includes a float 10 that moves along the siphon pipe 5 by the buoyancy of the liquid surface as a liquid surface detector, a valve seat 12 provided in the lower portion of the siphon pipe 5 that constitutes the second opening / closing valve 11, and a guide. A valve portion 14 that is displaced in the direction of gravity along the inside of the siphon tube 5 by the blades 13, and a support portion at the lower end of the siphon tube 5, one of which is the lower end of the float 10 and the other of which is the lever 15 that abuts the lower end of the valve portion 14, the float. It is composed of a float restraint 16 for preventing unnecessary movement of the valve 10, and a pressure equalizing pipe 17 of a small diameter provided on the valve seat 12.

Refrigerant-filled cylinder 1 constructed as described above
The operation when the refrigerant is enclosed in an air conditioner or the like by using will be described below.

When the refrigerant is charged from the refrigerant charging cylinder 1 into the air conditioner or the like, the first connecting joint 3 is connected to the air conditioner to seal the refrigerant with a hose or the like, and the first on-off valve 4 is opened. To do. When the liquid refrigerant in the refrigerant filling cylinder 1 is above the liquid level A as shown in FIG. 2, the float 10 is lifted by the buoyancy of the liquid refrigerant and held in contact with the float restraint 16. The valve portion 14 is lowered by gravity, the second opening / closing valve 11 is opened, and the refrigerant is supplied. When the amount of the refrigerant in the refrigerant charging cylinder 1 decreases and the liquid level becomes lower than the liquid level A, the float 10 lowers due to the liquid level and pushes down the lever 15 and pushes up the valve portion 14. Further, when the liquid level lowers and becomes equal to or lower than the liquid level B shown in FIG. 2, the valve portion 14 comes into contact with the valve seat 12, the second on-off valve 11 is closed, and the supply of the refrigerant is stopped. Therefore, the encapsulation of the refrigerant is stopped when the liquid refrigerant is slightly left, and the refrigerant having a different composition is not enclosed in the air conditioner or the like.

When refilling the refrigerant-filled cylinder 1 with a small amount of refrigerant, the remaining refrigerant is opened by opening the third opening / closing valve 9 provided in the second air supply / exhaust port 7, Two
It collects in another collection container etc. which were connected with the connection joint 8 of.
Then, the inside of the refrigerant charging cylinder 1 is evacuated, and a refrigerant having a predetermined composition is charged from the first air supply / exhaust port 2 or the second air supply / exhaust port 7, so that it can be used again as a refrigerant charging cylinder.

If the refrigerant-filled cylinder 1 is erroneously filled with the refrigerant in an air conditioner or the like in an inverted state, the valve portion 14 falls due to gravity and contacts the valve seat 11 regardless of the position of the float 10. As a result, the second opening / closing valve 11 is closed. As described above, since the refrigerant is not supplied even when the first opening / closing valve 4 is opened, the gas refrigerant is prevented from being enclosed in the device.

Further, when the sealing work is performed in the overturned state, since there is nothing to restrain the movement of the valve portion 14, the gas refrigerant moves toward the valve seat 12 due to the pressure loss when passing between the guide vanes 13. It will be in a closed state. Therefore, when the second opening / closing valve 11 is closed in the inverted state or the inverted state, the first opening / closing valve 4 is closed, and when the inverted state or the inverted state is returned to the normal state, the liquid refrigerant is Is liquid level B
In the above case, the float 10 is lifted by buoyancy and the lever 15 does not push up the valve portion 15. Furthermore, pressure equalizing pipe 1
When the refrigerant gradually flows through 7, and the pressure difference before and after the second on-off valve 11 disappears, the valve portion 14 is lowered by gravity, and the second on-off valve 11 is opened. In this state, the first on-off valve 4
When the valve is opened, the refrigerant charging work can be continued again.

As described above, in the refrigerant-filled cylinder according to the present embodiment, the liquid level is detected by the float, and the second opening / closing valve is opened only when the liquid level is equal to or higher than a certain level, so that the refrigerant can be charged. However, a gas refrigerant having a large composition change is not enclosed in an air conditioner or the like. Further, by providing the pressure equalizing pipe, even if the second opening / closing valve is once closed due to an erroneous operation, the work can be continued by returning to the normal state. Also,
By making the shapes of the connecting joints of the first air supply / exhaust port and the second air supply / exhaust port different, it is possible to prevent accidentally connecting the hose to the second air supply / exhaust port during the filling operation.

Another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a vertical cross-sectional view showing the gas refrigerant entrapment prevention device according to this embodiment.

In the present embodiment, a spring 18 is provided between the float 10 and the float retainer 15 so that the float 10 is constantly pushed downward with a force smaller than the buoyancy of the float 10. Other parts are the same as those shown in FIGS. 1 and 2.

When attempting to fill the refrigerant into the air conditioner or the like with the refrigerant-filled cylinder 1 falling, the axial force of the siphon pipe 5 of the float 10 is only the spring 18, and the siphon pipe 5 moves downward along the siphon pipe 5 in FIG. When the valve portion 14 moves, the valve portion 14 is brought into contact with the valve seat 12, and the second opening / closing valve 11 is closed. When the refrigerant is charged in other states, the same operation as in the above embodiment is performed.

Therefore, in this embodiment, in addition to the effects of the above-described embodiment, when the refrigerant-filled cylinder is in the tumbling state, the refrigerant can be surely stopped from filling regardless of the state of the refrigerant.

Still another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a vertical sectional view showing the gas refrigerant entrapment prevention device according to this embodiment.

In this embodiment, the magnet 19 is provided inside the float 10.
The second float retainer 20 at a position where the valve portion 14 is brought into contact with the valve seat 12 when the float 10 is lowered.
Each has a valve retainer 21 to prevent the fall of
Parts other than the valve portion 14 are made of a non-magnetic material such as copper alloy. These parts perform the same operation as the parts shown in FIGS.

When the liquid refrigerant in the refrigerant charging cylinder 1 is above the liquid level A, the float 10 is in contact with the float restraint 16 by the buoyancy. The valve portion 14 is attracted by the magnetic force of the magnet 19, but since the magnet 19 and the valve portion 14 are separated from each other by a distance smaller than the gravity acting on the valve portion 14,
The valve portion 14 is held by the valve portion retainer 21, and the second opening / closing valve 11
Is open. Therefore, when the first on-off valve 4 is opened in this state, the liquid refrigerant can be supplied to the device. When the liquid surface is lowered and the float 10 is in the range from the liquid surface A to the liquid surface B, the float 10 is lowered according to the liquid surface,
Since the gravity is larger than the magnetic force acting on the valve portion 14, the liquid refrigerant is continuously supplied. When the liquid level further decreases and reaches the liquid level B, when the magnet 19 and the valve portion 14 approach each other, the magnetic force acting on the valve portion 14 becomes larger than the gravity, and the valve portion 14 rises due to the magnetic force and the valve seat 12 is formed. Upon contact, the second on-off valve 11 is closed and the supply of refrigerant is stopped. At this time, since the float 10 comes into contact with the second float restraint 20, even if the liquid level further decreases, it does not drop any further, and the contact state between the valve portion 14 and the valve seat 12 is maintained.

When the refrigerant-filled cylinder 1 is turned upside down, the valve portion 14 comes into contact with the valve portion 12 due to gravity and the flow of the gravity and the magnetic force exerted by the magnet 19 in the float 10 that comes into contact with the restraining member 16 to act on the valve portion 14. The second on-off valve 11 is closed, and no refrigerant is supplied even if the first on-off valve 4 is opened.

Further, when the sealing work is performed in the overturned state, the valve portion 14 comes into contact with the valve seat 12 due to the pressure loss and the magnetic force of the refrigerant passing between the guide vanes 13, so that the second opening / closing valve 11 is opened. It becomes closed and the supply of refrigerant is stopped. Therefore,
In this embodiment, the moving part has only the float and the valve part, and has the same effect as the above embodiment.

[0026]

According to the present invention, when a refrigerant is charged from a refrigerant-filled cylinder filled with a non-azeotropic mixed refrigerant into an air conditioner or the like, the gas refrigerant is sealed so that the inlet / exhaust port inlet is open only when it is a liquid refrigerant. With the prevention device, a refrigerant having a predetermined composition can be filled without accidentally filling the gas refrigerant.

[0027]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the structure of a refrigerant-filled cylinder according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a gas refrigerant entrapment prevention device of the present embodiment.

FIG. 3 is a vertical cross-sectional view showing a gas refrigerant sealing prevention device according to another embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a gas refrigerant enclosure prevention device according to still another embodiment of the present invention.

FIG. 5 is a diagram showing a composition change of a refrigerant when the refrigerant is charged.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Refrigerant filling cylinder, 2 ... 1st refrigerant supply / exhaust port, 4 ... 1st opening / closing valve, 5 ... Siphon tube, 6 ... Gas refrigerant encapsulation prevention device, 10 ... Float, 11 ... 2nd opening / closing valve, 12 ... Valve seat, 14 ... Valve section, 15 ... Lever, 17 ... Equalizing tube, 18 ...
Spring, 19 ... Magnet.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kiyomitsu Kanno 1-13-9 Shibadaimon, Minato-ku, Tokyo Within Showa Denko KK

Claims (3)

[Claims] Claims: 1. A refrigerant-filled cylinder filled with at least two or more kinds of non-azeotropic mixed refrigerant and provided with a supply / exhaust port having a first opening / closing valve that can be opened and closed. A surface detector is provided, and a second opening / closing valve consisting of the liquid level detector, a valve section for opening / closing the supply / exhaust port, and a valve seat is provided, and the open / closed state of the second opening / closing valve is set to When the inlet is liquid refrigerant and when the detection position of the liquid level detector is above the set value, it is opened, when the detection position is below the set value it is closed, and when the inlet / outlet inlet is gas refrigerant A refrigerant-filled cylinder, comprising a gas refrigerant encapsulation prevention device including a drive mechanism that is closed regardless of a detection position. 2. A supply / exhaust port provided with a siphon pipe reaching a lower portion of the refrigerant charging cylinder, a liquid level detector composed of a float moved by the buoyancy of the liquid refrigerant, and one of which is always displaced in the direction of gravity and inside the siphon pipe. A valve seat provided on the other side, and the other is composed of a valve part that can come into contact with a lever that is displaced at the position of the float, and when the float reaches a position below a set value, the valve part is brought into contact with the valve seat via the lever. The refrigerant-filled cylinder according to claim 1, further comprising a gas refrigerant entrapment prevention device having a drive mechanism that is displaced. 3. A liquid surface comprising a supply / exhaust port provided with a siphon tube made of a non-magnetic material reaching the lower portion of the refrigerant filling cylinder, and a float having a magnet inside which is moved by the buoyancy of the liquid refrigerant. A detector, a valve seat provided in the siphon pipe, and a valve seat that is in contact with one of the valve seat and the other, and the other is capable of contacting with the valve restraint, and the valve has a distance between the float and the valve set. When the value is less than or equal to the value, the gas refrigerant entrapment prevention device is provided, which has a drive mechanism that is displaced in the direction of contacting the valve seat by the attraction force of the magnet in the float, and is displaced by gravity when the value is greater than or equal to the set value. Item 1. A refrigerant-filled cylinder according to Item 1.