JPH047503Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for filling a separately evacuated pressure vessel with a fluid such as a refrigerant liquid, for example, by filling the same container twice or thrice. The present invention relates to a fluid filling device that prevents a filling device (hereinafter referred to as a charging gun) inserted into a pressure vessel from becoming difficult to open due to an increase in the internal pressure of the container when filling the pressure vessel with fluid, and allows fluid filling to be carried out smoothly.

[Technical background of the invention] Conventionally, when filling an air conditioner with a refrigerant liquid such as Freon, the inside of the filling container is evacuated in advance, and then a fluid filling device connected to the filling port of the container is used to fill the space. I try to fill it in a fixed amount.

A conventional fluid filling device is constructed as shown in FIG. In this figure, reference numeral 51 denotes an inlet for fluid to flow in. Fluid is fed under pressure from a pump (not shown), etc., and passes through a valve 52, a filter 53, a check valve 54, and a pipe 55 to one end of a cylinder 56. It is configured to be press-fitted into the cylinder 56 from above. In addition, pipe 55
A pressure control valve 106 is attached via a valve 105 to the pressure control valve 106 . The cylinder 56 is provided with a piston 57 that can reciprocate within the cylinder. The piston 57 is provided with a sliding rod 58, which extends outward from one end of the cylinder 56, and an engagement protrusion 59 provided at the tip thereof engages the filling amount setting mechanism 60. It can move between the stop switches 61 and 62 and engage with these switches. These stop switches 6
When the engaging protrusion 59 comes into contact with 1 and 62, a switch is activated and the reciprocating movement is stopped.

Further, the cylinder 56 is configured to be supplied with hydraulic pressure by a hydraulic device 63 from the other end thereof. That is, the hydraulic pump 64 is connected to the motor 6
5, the strainer 67 is driven from the oil tank 66.
The oil is sucked in through the cylinder 56 through the check valve 68, the three-way valve 69, and the flow control valve 107.
It is configured so that it can be supplied from below as shown in the figure. Note that a pressure control valve 108 is attached to the discharge path of the hydraulic pump 64. Also, three-way valve 6
9 is provided with a pipe 70 that is open to the oil tank 66 for discharging the oil in the cylinder 56. The three-way valve 69 is configured to be driven by a solenoid 71, and the solenoid 71 is driven by the motor 6.
5 and is connected to a control means (not shown), and is controlled based on output signals from stop switches 61 and 62.

The fluid pumped from the cylinder 56 is
It is arranged so as to be supplied to a pressure vessel 75 and the like via a pipe 55, a filter 72, a valve 73, and a charging gun 74. The valve 76 is
This is a valve used for gas purge, etc.

The charging gun 74 is equipped with a pressure valve that opens when the pressure of the fluid pumped from the cylinder 56 exceeds a certain value (cracking pressure).

In the fluid filling device configured in this way, the fluid press-ined from the inflow port 51 is filled into the cylinder 56, and then the pressure oil sent from the hydraulic pump 64 operates the hydraulic cylinder 56 and increases the hydraulic pressure. Therefore, the fluid in the cylinder 56 is forced to the charging gun 74. In this case, since the hydraulic pressure is made higher than the fluid pressure from the inlet 51, the hydraulic fluid is transferred to the inlet 51 by the check valve 54.
It does not flow in the direction of the charging gun 74, but is pumped only in the direction of the charging gun 74. The pressure vessel 75 into which the charging gun 74 is inserted is evacuated in advance by a vacuum device (not shown), so if the hydraulic fluid pressure exceeds the cracking pressure of the charging gun 74, charging will occur. The gun gun 74 opens its valve and fills the pressure vessel 75 with fluid. For example, the pressure of the fluid supplied into the cylinder 56 from the inlet 51 is 18 Kg·f/cm ² , the cracking pressure of the charging gun 74 is 28 Kg·f/cm ² , and the fluid is fed from the cylinder 56 to the charging gun 74 The pressure of the fluid is usually 40Kg·f/cm ² . Filling progresses in this manner, and the flow rate preset by the setting mechanism 60 is filled.

[Problems with the background art] By the way, in the above-mentioned filling device, depending on the state of the pressure vessel 75 inserted into the charging gun 74, the filling may be repeated two or three times after a certain amount has been filled. There may be cases where it is necessary to do so.
In such a case, since the pressure container 75 has been filled once, the pressure inside the container is much higher than the vacuum state, for example, about 12 kg・f/cm ² , and therefore the next filling is performed. At the same time, there was a problem that the valve of the charging gun 74 could not be fully opened with the same hydraulic pressure, resulting in a slow filling speed. On the other hand, in order to increase the filling speed, it is necessary to further increase the hydraulic pressure of the cylinder to increase the filling pressure and fully open the charging gun 74, which makes the filling operation cumbersome.

[Purpose of the invention] In view of the above-mentioned points, the purpose of the invention is to prevent the filling speed from slowing down even if the pressure vessel is filled once and then again for a second or third time. To provide a fluid filling device that can be filled smoothly without increasing pressure.

[Summary of the invention] The invention has a structure in which a piston mechanism is provided connected to the valve shaft of a crack-type filling pressure valve installed in a charging gun, and a piston mechanism is provided to pressurize fluid into the filling pressure valve. By supplying pressurized oil or pressurized air to the piston mechanism, the filling pressure valve can be easily opened even at a low filling pressure.

[Embodiments of the invention] Hereinafter, embodiments of the invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view showing the internal structure of a charging gun of a fluid filling device according to the present invention.

In this figure, a charging gun 1 is composed of a port block 2, a main body block 3, a lower block 4, and a discharge part 5, and the port block 2, main body block 3, and lower block 4 are integrally assembled. connected to. The discharge portion 5 is connected to the lower block 4 through a nipple 6, and a stem rod 7 and a coupler 8 are connected to the tip of the nipple 6. The port block 2 is equipped with a filling connection port 9 and a pressure oil (or air) blowing port 11. It is provided. The cylinder 12 is formed to have a larger diameter than the diameter of the passage communicating with the blowing port 11, and a piston 13 is disposed therein so as to be able to reciprocate. The piston 13 has a hollow cylindrical shape with the bottom facing upward in the figure, and a connecting member 14 is disposed in the hollow portion to connect the valve shaft 15. A spring receiver 16 is fixed to the lower side of the connecting member 14 in the drawing, and a sleeve 17 that penetrates the main body block 3 in a cylindrical shape is formed below the spring receiver 16. A valve stem 15 is disposed within this sleeve 17, and the valve stem 15 is disposed so as to pass through a shaft sealing member 18 fixed below the main body block 3 so as to be movable up and down. Shaft sealing member 18
is fixed within the sleeve 17 of the main body block 3,
It has a filling passage 19 inside, a protruding seal part 20 at its lower end, and a spring receiver 21 fixed to its upper end. A coiled spring 22 is disposed between the spring receivers 16 and 21 so as to surround the valve shaft 15.
Rubber packing 23a on the upper surface of the lower end of the valve stem 15
A valve body 23 having a diameter is connected to the valve body 23. This valve body 2
3 is arranged within a valve chamber 24 formed in the lower block 4. The valve chamber 24 is the valve body 23
It is formed to have a wider diameter than the diameter of the pipe, and is designed to also serve as a filling passage. Thus, the filling passage is such that the passage 10 formed in the port block 2 and the main body block 3 and the passage 19 formed in the shaft sealing member 18 are always in communication with each other, and when the valve body 23 moves downward in the figure, the passage is 19 and the valve chamber 24 communicate with each other. Further, the valve chamber 24 is connected to the passage 6 of the nipple 6.
a and a through passage 7a formed in the stem rod 7, and communicates with a discharge port 8a of the coupler 8 through a filling passage on the outer periphery of the stem rod 7. Note that an O-ring 8b is attached to the inner peripheral surface of the discharge port 8a.

2 shows a top view of the port block 2 of FIG. 1, and FIG. 3 shows a plan view taken from the - line in FIG. As shown in FIG. 2, a fluid filling connection port 9 is formed on the upper surface of the port block 2, and a pressure oil (or air) injection port 11 for piston operation is formed on the outer peripheral side. or,
As shown in FIG. 3, a seal portion 20 is formed on the lower surface of the main body block 3 and protrudes from the shaft seal member 18, and a filling passage 1 provided at the center of the shaft seal member 18 is formed.
A valve shaft 15 passes through the interior of the valve 9 .

In such a configuration, first, pressure oil or air is not blown into the blowing port 11 and the piston 1
3 is not performed, the valve body 23 attached to one end of the valve shaft 15 is moved by the spring 22.
The upper surface of the valve body is forced upward in the illustrated direction by the shaft sealing member 1.
8 and has a cracking pressure set by a spring 22.
In this state, when fluid is filled through the connection port 9 and the filling passages 10 and 19, if the filling pressure exceeds the cracking pressure of the valve body 23, the pressure causes the valve body 23 to move downward in the figure. The upper surface thereof is separated from the seal portion 20, and the fluid is filled into the discharge portion 5 side through the valve chamber 24. The above operation is the same as that of a conventional charging gun. On the other hand, when operating fluid such as pressure oil or air is blown into the blowing port 11, the piston 13 and the valve shaft 15 are pushed down, and the crack-type valve body 23 can be forcibly opened. In this case, since the pressing surface of the piston 13 disposed in the cylinder 12 is formed to have a large area compared to the cross-sectional area of the inflow path of the operating fluid, a large pressing force can be obtained with a small suction pressure, and the valve body
3 can be forcibly opened. Therefore, even if the pressure of the fluid pumped through the filling connection port 9 and the filling passages 10 and 19 is below the cracking pressure of the valve body 23, the valve body 23 is forcibly opened to perform fluid filling. be able to. For example, the discharge part 5
In cases where the pressure vessel inserted at the tip is filled once and then filled again two or three times,
Even if the pressure inside the container increases during the first filling, the valve body 23 can be forced down against the high internal pressure on the side of the discharge part 5, and fluid filling can be performed smoothly.

FIG. 4 is a block diagram showing an example of a fluid filling device constructed using the charging gun 1 described above. Briefly, fluid such as refrigerant liquid is supplied to the inlet 25 from a booster pump (not shown) or the like, and is forced into the cylinder 31 through the valve 26, the filter 27, the switching valve 28, the check valve 29, and the pulp 30. The inflow pressure at this time is, for example, 18
Kg・f/ ^cm2 . Note that a pressure control valve 102 is attached to the pipe 30 via a valve 101. The cylinder 31 has a piston 32 that can freely reciprocate, and a sliding rod 33 is attached to the piston 32 so as to extend outward from one end of the cylinder 31. The piston 32 is pushed down in the figure by the fluid press-fitted into the cylinder 31, and as a result, the engaging protrusion 3 at the tip of the sliding rod 33
4 is also pushed down so that the protrusion 34 engages with the stop switch 36 of the setting mechanism 35. Another stop switch 37 is attached to the setting mechanism 35 so that the filling amount can be set when the piston 32 is raised to fill the fluid. Filling with fluid is performed by flowing pressure oil into the other end of the cylinder 31 from the hydraulic device 38. That is, a hydraulic pump 40 driven by a motor 39 sucks oil from an oil tank 41 through a strainer 42 and transfers it to a check valve 43 and a three-way valve 4.
4 and the flow rate control valve 103 into the cylinder 31. Note that a pressure control valve 104 is attached to the discharge path of the hydraulic pump 40. or,
Pressure oil discharged from the hydraulic system 38 is simultaneously supplied to the injection port 11 of the charging gun 1 via a valve 45. Therefore, the piston 32 is pushed upward in the figure by the pressure oil, and the fluid in the cylinder 31 is pushed up into the pipe 3.
0, is fed under pressure to the filling connection port 9 of the charging gun 1 through the filter 46 and valve 47, while pressure oil at the same pressure is sent to the blowing port 11 of the charging gun 1. In this case, for example, assuming that the cracking pressure of the valve body 23 of the charging gun 1 is 28 Kg·f/cm ² , in the conventional charging gun, the hydraulic pressure from the hydraulic system during filling exceeds the above-mentioned cracking pressure, for example.
40Kg・f/cm ² was required, but in the charging gun 1 of the present invention, the above hydraulic pressure is, for example, 15Kg・f/cm 2.
f/ ^cm2 is sufficient. This is because the valve body 23 is
In addition to the hydraulic pressure of 15Kg・f/ ^cm2 , the piston 13
Since the same hydraulic pressure is applied to the valve body 23, this level of hydraulic pressure is sufficient to push down the valve shaft 15 against the biasing force of the spring 22 and open the valve body 23. When the charging passage of the charging gun 1 is opened in this way, the cylinder 3
Fluid pumped from inside 1 (15 kg in the above example)
The fluid (f/cm ² ) is smoothly filled into the pressure vessel 48. Therefore, not only during the first filling when the inside of the pressure vessel 48 is previously evacuated, but also when filling is performed a second or third time, the filling can be carried out smoothly without increasing the filling pressure of the fluid. The valve 49 is a valve used for gas purge, etc., and the three-way valve 44 has a pipe 5 opened to the oil tank 41 for discharging the oil in the cylinder 31.
0 is connected. Further, the three-way valve 44 is driven by a solenoid 44a,
The switching valve 28 can also be switched by a solenoid 28a. These solenoids 44
a, 28a and motor 39 are connected to a control circuit (not shown), and this control circuit is connected to stop switches 36, 3
The three-way valve 44, the switching valve 28, and the motor 39 are controlled by receiving the output signal from the three-way valve 7. Switching valve 28
In this case, the pressure of the fluid supplied from the inlet 25 to the cylinder 31 is, for example, 18 kg·f/cm ² , and the pressure of the fluid pumped from the cylinder 31 to the charging gun 1 during filling is, for example, 15 kg·f/cm ² . If there is,
The check valve 29 is inserted to prevent the fluid of 18 kg·f/cm ² from flowing into the charging gun 1 when it is opened during filling. That is, when filling, switching valve 2
8 is closed by driving the solenoid 28a. The setting mechanism 35 is configured such that the set amount can be changed by changing the interval between the stop switches 36 and 37.

In Fig. 4, the crack-type filling valve of the charging gun 1 is forcibly opened by supplying pressure oil from the hydraulic system to the piston inside the gun. This may be carried out by supplying compressed air from a pneumatic device instead of oil. Furthermore, although the above-mentioned device is mainly used to fill a pressure vessel of an air conditioner with refrigerant liquid,
The present invention is not limited to this, but can be applied to an apparatus for filling fluid, such as when filling brake oil into a brake oil pipe of an automobile.

[Effects of the invention] As described above, according to the invention, a piston part is provided connected to the valve shaft of a crack-type filling pressure valve, and pressurized fluid for operation is applied to the piston part to lower the pressure valve. The structure allows the circuit to open easily even at filling pressure, so it is possible to fill the pressure vessel with fluid such as refrigerant twice.
When filling the container three times, the pressure valve is opened and the filling is performed smoothly even if the internal pressure inside the container has increased due to the pressure of the fluid that has already been filled. Therefore,
The filling pressure of the fluid to be filled may be less than the cracking pressure of the pressure valve, and even when filling is performed twice or three times, the necessary filling speed can be secured without increasing the filling pressure. There are advantages.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the internal structure of a charging gun of a fluid filling device according to the present invention, Fig. 2 is a top view of Fig. 1, and Fig. 3 is a plan view taken from the - line in Fig. 1. 4 is a block diagram showing an embodiment of the fluid filling device according to the present invention, and FIG. 5 is a block diagram showing a conventional fluid filling device. 1...Charging gun, 9...Filling connection port, 10, 19, 6a, 7a...Filling passage,
8a...Discharge port, 11...Operation fluid injection port, 12...Cylinder, 13...Piston,
14... Connection member, 15... Valve stem, 17... Sleeve, 18... Shaft sealing member, 20... Seal portion, 2
2... Spring, 23... Valve body, 24... Valve chamber.

Claims (1)

[Scope of utility model registration request] It includes a filling connection port, a filling passage communicating with this port, and a discharge port communicating with this passage, and a valve chamber is formed in the filling passage, and the valve chamber is normally closed by the biasing force of a spring. A cylinder in which a valve body is disposed in close contact with a seal portion to close a filling passage, fluid pressure due to the inflow of filling fluid into the passage is applied in a direction in which the valve body opens the passage, and pressurized fluid for operation is supplied. A piston connected to the valve body is disposed within the cylinder, and the valve body is operated by the fluid pressure of the operating pressurized fluid supplied into the cylinder in addition to the fluid pressure of the filling fluid. A fluid filling device characterized in that the circuit is opened.