JPH0792301B2 - Connector for fluid filling - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filling connector, and more particularly to a filling connector used for filling a cooler circuit of a cooler device with a refrigerant such as CFC gas.

[0002]

2. Description of the Related Art In automobile coolers and domestic cooler devices, a refrigerant (for example, chlorofluorocarbon) that has decreased due to aging.
In the case of an automobile cooler, for example, a filling connector 1 as shown in FIG. 3 is used to connect the Freon service can 2 and the low pressure side of the compressor 3 as shown in FIG. As a result, Freon gas was replenished. As shown in FIG. 3, a conventional filling connector 1 is a main body 1
a, a shaft 1b having a threaded portion 1h that is screwed into the inner cylindrical surface of the main body 1a, a valve body 1i mounted below the threaded portion 1h of the shaft 1b, and the valve body 1i Therefore, a valve seat 1j formed on the inner cylindrical surface of the main body 1a, a cutter 1e mounted below the valve body 1i and integrally rotated with the shaft 1b and the valve body 1i by rotation of the handle 1c, and a filling connection. Ingredient 1
Connection part 1 for screwing the CFC service can 2 onto the mouth
d, a packing 1f that seals the fluorocarbon gas so that the fluorocarbon gas does not leak when the fluorocarbon service can 2 is screwed onto the fluorocarbon service can 2, and a hose mounting portion 1g for mounting the charge hose 4 (FIG. 4). There is.

The operation of filling the cooler circuit of the compressor 3 with the CFC gas in the CFC service can 2 is performed as follows. First, the connecting portion 1 of the filling connector 1
By screwing d into a screw provided at the mouth of the Freon service can 2, the filling connector 1 and the Freon service can 2 are attached.
And connect. Next, the other end of the charge hose 4 having the charge nipple 5 (FIG. 4) attached to one end is attached to the hose attachment portion 1g of the filling connector 1 (in the above-described state, the charge nipple 5 is still attached to the compressor 3). Is not connected and is in a free state). Next, by rotating the handle 1c of the filling connector 1, the shaft 1b is rotated.
The cutter 1e attached to the tip of the
To make a hole in the CFC service can 2 (at this time, the valve body 1i and the valve seat 1j are seated, and the valve is in a closed state). Next, by rotating the handle 1c in the opposite direction, the valve is opened and the CFC gas in the CFC service can 2 is discharged from the charge nipple 5 attached to the tip of the charge hose 4 to expel the air in the charge hose 4. Perform air purge work. Finally, while discharging the CFC gas from the charge nipple 5, the charge nipple 5 is connected to the low pressure side of the compressor 3. As a result, the cooler circuit of the compressor 3 is filled with CFC gas.

[0004]

Problems to be Solved by the Invention When the above-described filling work is performed using the conventional filling connector 1, the following problems occur. First, when the last work, that is, when the charge nipple 5 is connected to the low-pressure side of the compressor 3, there is a risk that the CFC gas blown out from the charge nipple 5 may touch the operator's hand and cause frostbite. This is because the oil (snili oil) mixed in the service can 2 scatters and soils the equipment in the engine room and the hands of workers.

Generally, when air is mixed in the cooler circuit when the CFC gas is filled, the compression efficiency of the CFC gas is reduced and the cooling capacity of the cooler device is reduced.
It is necessary to prevent the entry of air. For this reason, the above-mentioned air purging work is performed, but the discharge of the CFC gas cannot be stopped in order to expel the air in the charge hose 4. Therefore, even when the charge nipple 5 is attached to the compressor 3, It was necessary to continue to discharge CFC gas from No. 5, and the above problems were unavoidable.

Secondly, if the charging nipple 5 is erroneously connected to the high pressure side of the compressor 3 because the check valve is not provided in the filling connector 1, the chlorofluorocarbon gas causes the cooler circuit. There is a risk that it will flow back into the Freon service can 2 and burst the Freon service can 2. Therefore, it is an object of the present invention to provide a fluid filling connector which can solve all the above problems.

[0007]

SUMMARY OF THE INVENTION In order to achieve such a technical problem, the present invention comprises a first tubular member and a second tubular member arranged in series in the axial direction. The tubular member is formed by a casing in which opposed ends that are adjacent to each other are airtightly fitted to each other and are allowed to approach each other by a predetermined stroke in the axial direction, and an internal space of the first tubular member and the second tubular member. Fluid passage extending in the axial direction, a valve accommodating chamber formed in the fluid passage in the second tubular member, a valve seat formed on the first tubular member side in the valve accommodating chamber, and the valve accommodating chamber. When the valve body housed in the chamber extends from the first tubular member toward the valve housing chamber through the fluid passage and the first tubular member and the second tubular member are brought close to each other. The first protrusion protrudes into the valve accommodating chamber and is forcibly separated from the valve seat. A rod retreating from the valve accommodating chamber when the Jo member was separated and the second tubular member, is the valve body as a configuration including a spring for urging in a direction to seat the valve seat.

[0008]

The operation of the present invention having the above-described structure will be described by way of example in which the fluid filling connector of the present invention is applied to the operation of filling the cooler compressor with the supplementary CFC gas contained in the CFC service can. First, the fluid tubular opening on the second tubular member side of the fluid filling connector of the present invention is
Connect to the low pressure side of the cooler compressor. In the fluid filling connector of the present invention, when the first tubular member and the second tubular member side are in a state of being brought close to each other, the rod projects into the valve accommodating chamber and the valve body is separated from the valve seat, In other words, since the valve is open, the freon gas of the compressor circuit pushes the air in the connecting hose toward the fluid filling connector and the second tubular member passes through the hose when the connection is made. The fluid flows from the side fluid passage into the fluid passage inside the fluid filling connector, and further into the valve accommodating chamber formed in the second tubular member. The chlorofluorocarbon further pushes the air into the fluid passage on the side of the first tubular member, and releases this air into the atmosphere from the open end of the fluid passage of the first tubular member.

At this time, the operator is required to use the first tubular member and the second tubular member.
Separate the tubular members. As a result, the rod retreats from the valve accommodating chamber, the valve body can function as a valve body, and the pressure of the CFC gas from the compressor side causes it to sit on the valve seat and form a valve closed state. By this valve closing, the air purging in the hose is completed, and the hose, the fluid passage of the second tubular member, and the valve accommodating chamber are filled with the CFC gas flowing out from the compressor.

Next, when the fluid passage opening of the first tubular member is connected to the Freon service can and the compressor is operated, the first tubular member side has a positive pressure and the second tubular member side has a negative pressure. The valve element separates from the valve seat. As a result, the gas in the service can fills the compressor through the fluid passage of the first tubular member, the valve accommodating chamber, the fluid passage of the second tubular member, and the connecting hose.

If the first and second tubular members are separated from each other (that is, after the manual purging operation is stopped), the CFC service can is erroneously placed on the high pressure side of the compressor via the fluid filling connector. When connected, that is, when the pressure on the side of the second tubular member is much higher than the pressure on the Freon service can, the valve body is kept seated due to this large pressure difference, and the fluid filling connection is made. The tool will perform the function of a check valve.

During the air purging, since the operator can hold the casing of the fluid filling connector and work, the fluorocarbon gas does not come into contact with the operator's hand and there is no risk of frostbite. Also, after the completion of purging, the release of CFCs can be stopped while preventing the intrusion of air into the connecting hoses, etc., and the CFC service can and compressor can be connected in this state, so CFCs are unnecessarily discharged into the atmosphere. Never. Since the air purging operation is performed by discharging the CFCs on the compressor side, the oil mixed in the CFC service can (sunny oil) does not cause the inside of the engine room to be contaminated. Furthermore, when it is mistakenly connected to a high pressure area such as the high pressure side of the compressor in a region of relatively high pressure, it has a check valve function that instantly closes the valve, so that due to an erroneous operation etc. It becomes possible to solve all the conventional problems that it is possible to prevent the service can from being damaged by backflowing to the service can.

[0013]

The present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, in the fluid filling connector 120 of the first embodiment of the present invention, a casing is formed by the first tubular member 14 and the second tubular member 12, and both tubular shapes are provided. Axial passages 12a and 14a are formed in the centers of the members 12 and 14 to allow passage of a fluid (a CFC gas when the CFC circuit is filled with CFC gas). Further, the tubular members 12 and 14 are fitted (i.e., loosely fitted) to each other so as to be relatively movable in the axial direction. A position where the tip of the screw 16 provided on the first tubular member 14 enters the annular groove 12b formed on the outer periphery of the second tubular member 12 but does not contact the outer peripheral surface of the annular groove 12b. Has just entered. Therefore, in both the tubular members 12 and 14, the threaded portion of the screw 16 is the shoulder portion 12c of the annular groove 12b of the second tubular member 12.
Can move relative to each other until it comes into contact with.

A valve seat 12d is formed in the fluid passage 12a of the second tubular member 12, and the valve seat 12d is formed.
A ball 18 is housed in cooperation with which constitutes a valve to prevent backflow of fluid (when the fluid flows from right to left in FIG. 1 is backflow). A rod 30 is provided on the left side of the ball 18, and a spring 2 is provided on the right side.
4 is provided. The rod 30 has the first tubular member 14
To the valve accommodating chamber through the fluid passage, and its tip is in contact with the ball 18 as a valve element. Further, the union 20 is screwed to the end of the second tubular member 12, and the ball 18 is attached in the direction in which it is seated on the valve seat 12d by the spring 24 interposed between the union 20 and the ball 18. Energized. The union 20 is in contact with one end of the spring 24, and by adjusting the screwing amount of the union 20 with respect to the second tubular member 12, the pressing force with respect to the spring 24 is changed and the gap between the ball 18 and the valve seat 12d is changed. Can be adjusted to change the pressure at which the air coming from the union 20 is purged. Also,
The pressure for filling the cooler circuit with CFC gas can be appropriately adjusted. One end of a charge hose as shown in FIG. 4 is connected to the union, and a charge nipple for connecting to a compressor is attached to the other end of the charge hose. On the other hand, a cylindrical cutter 23 is attached to the end of the first tubular member 14 at a position surrounding the fluid passage 14a. Further, a screw 25 is formed on the inner peripheral surface of the tip portion of the first tubular member 14, and the screw 25 can be screwed onto the screw provided at the mouth of the Freon service can. The number 26 indicates that when the first tubular member 14 of the fluid filling connector 10 is screwed into the mouth of the Freon service can, CFC gas or oil leaks from between the mouth and the first tubular member 14. Packing to prevent it, number 2
Reference numeral 8 is an O-ring that seals between the tubular members 12 and 14.

Therefore, when the first tubular member 14 and the second tubular member 12 are close to each other (state of FIG. 1), the ball 30 is forcibly opened by the rod 30. The ball 18 does not move toward the first tubular member 14 even when pressure is applied from the second tubular member 12 side. In order to cause the ball 18 to be seated on the valve seat 12d and to cause the valve closing action, that is, to cause the ball 18 to function as a valve body, the first tubular member 14 and the second tubular member 12 are axially aligned with each other. The free end of the rod 30 (second
It is necessary to retract the tubular member side end portion) from the accommodation chamber.
In the state where the free end is retracted from the valve accommodating chamber, the ball is caused only by the balance between the pressure on the first tubular member 14 side, the pressure on the second tubular member 12 side, and the biasing force of the spring 24. It is seated on and off from the valve seat 12d.

Next, the working state of the first embodiment will be described by taking as an example the work of filling the CFC compressor from the CFC service can with CFC gas using the fluid charging connector 120. First, the fluid tubular opening of the fluid filling connector 120 on the second tubular member 12 side is connected to the low pressure side of the cooler compressor by a hose or the like. As mentioned above,
In the fluid filling connector of the present embodiment, when the first tubular member 14 and the second tubular member 12 are in the close state, the rod 30 forces the ball 18 to be in the state of being separated from the valve seat 12d. That is, since the valve is forcibly opened, when the above-mentioned connection is made, the CFC gas in the compressor circuit passes through the inside of the hose while pushing the air in the hose for connection toward the fluid filling connector 120. The fluid flows from the second tubular member 12 side fluid passage into the fluid passage inside the fluid filling connector 120, and further into the valve accommodating chamber formed in the second tubular member 12. Then, the air is pushed out into the fluid passage on the side of the first tubular member 14 by the chlorofluorocarbon gas, and is discharged into the atmosphere from the open end of the fluid passage of the first tubular member 14.

At this time, the operator separates the first tubular member 14 and the second tubular member 12 from each other in the axial direction. As a result, the ball 18 that functions as a valve body is acted upon by the pressure of the CFC gas from the compressor side, and the ball 18
Sit down and close the valve. By this valve closing, the air purging in the hose is completed, and the hose, the fluid passage of the second tubular member 12, and the valve accommodating chamber are filled with the CFC gas flowing out from the compressor.

Next, when the fluid passage opening of the first tubular member 14 is connected to the chlorofluorocarbon service can and the compressor is operated, the first tubular member 14 side becomes positive pressure and the second tubular member 12 side becomes negative pressure. Therefore, the ball 18 separates from the valve seat 12d. As a result, the gas in the service can fills the compressor through the fluid passage of the first tubular member 14, the valve accommodating chamber, the fluid passage of the second tubular member 12, and the connecting hose.

If the first and second tubular members 14 and 12 are separated from each other (that is, the purge is manually and forcibly terminated), the CFC service can is opened via the fluid filling connector 120. When the ball 18 is erroneously connected to the high-pressure side of the compressor, that is, when the pressure on the second tubular member 12 side is extremely higher than the pressure on the Freon service can, the ball 18 is seated due to this large pressure difference. And the fluid-filling connector 120 acts as a check valve, preventing backflow from the high pressure side of the compressor to the Freon service can.

The fluid filling connector 130 of the second embodiment shown in FIG. 2 uses the rod 30 and the spring 32 in common. The spring 32 has a function of increasing the force for sliding both the tubular members 12 and 14, and in this case as well, the same filling operation as in the first embodiment can be performed.

The fluid filling connector according to the present invention has been mainly described for the case of filling the CFC gas. However, in addition to this, an air release valve in a pipe of a water pipe or a gas pipe or a water intake prevention valve of an industrial device is used. Etc. can also be used.

[0022]

As is apparent from the above description, the fluid filling connector of the present invention can solve all the conventional problems. Further, according to the present invention, it is possible to solve the contradictory problems of fluid discharge such as purging and fluid backflow with the same device. That is, although the manual operation is accompanied by the flow of the fluid from the same direction, in some cases, the discharge of the fluid is permitted, and in some cases, the outflow of the fluid is prohibited. It is possible to provide a fluid filling connector that solves various problems.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of a fluid filling connector of the present invention.

FIG. 2 is a partial sectional view showing a second embodiment of the fluid filling connector of the present invention.

FIG. 3 is a partial cross-sectional view showing the structure of a conventional fluid filling connector.

FIG. 4 is a perspective view showing a method of filling the compressor of the cooler device with CFC gas using the fluid filling connector shown in FIG. 3;

[Simple explanation of symbols]

 120 ... Fluid filling connector 12 ... Second tubular member 14 ... First tubular member 18 ... Ball 24 ... Spring 30 ... Rod

Claims (1)

[Claims] 1. A first tubular member (14) and a second tubular member (12), which are arranged in series in the axial direction, wherein both tubular members are airtight at their opposing ends. A casing fitted and capable of approaching with a predetermined stroke in the axial direction, and the first tubular member (14) and the second tubular member (1)
2) A fluid passage (12a, 14a) formed in the internal space and extending in the axial direction, and the fluid passage (12a) in the second tubular member (12).
A valve accommodating chamber formed in the valve accommodating chamber, a valve seat (12d) formed on the first cylindrical member side in the valve accommodating chamber, a valve body (18) accommodated in the valve accommodating chamber, and the first cylinder. From the member (14) to the fluid passage (12a,
14a) extending toward the valve accommodating chamber,
When the cylindrical member (14) and the second cylindrical member (12) are brought close to each other, the cylindrical member (14) projects into the valve housing chamber to forcibly separate the valve body (18) from the valve seat (12d), and A rod (30) that retracts from the valve accommodating chamber when the first tubular member (14) and the second tubular member (12) are separated from each other, and the valve body (18) includes the valve seat (12d). And a spring (24) for urging the seat to be seated on the fluid filling connector.