JP2669211B2 - Gas filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for filling gas in a specific gas container such as a gas cylinder into a gas storage, and more particularly to a pump for pumping gas in a gas container having a pressure lower than the final filling pressure of the gas storage. The present invention relates to a gas filling apparatus which is configured to perform pressure filling at a pressure.

[0002]

2. Description of the Related Art For example, there is a so-called blow-down type hydraulic power source device mounted on the body side of a rocket having a structure shown in FIG. The hydraulic power source device 1 is roughly composed of an air storage device 2 and an oil tank 3.
The gas reservoir 2 having a capacity of about 0 liter is filled with, for example, helium gas at a pressure of 315 kgf / cm ² . Then, after the pressure of the air storage device 2 is adjusted to, for example, 210 kgf / cm ² by the regulator 4, the main valve 5
And pressurizes the flow piston 6 in the oil tank 3 with helium gas pressure. As a result, the oil 3a in the oil tank 3 is pushed out by the flow piston 6, and functions as, for example, an operating oil pressure of an actuator that drives a movable nozzle of a rocket.

[0003] When the helium gas is charged into the gas reservoir 2 of such a hydraulic power source device 1, for example, 150 kgf / cm
^The gas cylinder 7 pressurized to 2 is connected to the gas accumulator 2 via the check valve 8, and the differential pressure between the gas cylinder 7 and the gas accumulator 2 is used until the pressure in the gas cylinder 7 and the pressure in the gas accumulator 2 are balanced. The reservoir 2 is filled with helium gas.

After the gas cylinder 7 and the gas accumulator 2 are in pressure equilibrium, the plunger pump 9 is driven by an air compressor to pressurize the gas from the gas cylinder 7 and then the gas accumulator 2 is charged to the final filling pressure P. ₁ (for example, 315 kgf / c
helium gas is charged until the pressure reaches m ² ).

[0005]

In the above conventional structure, when the plunger pump 9 fills the gas accumulator 2 with helium gas, the gas accumulator 2 side downstream of the check valve 8 is closed. first check valve 8 will open when the discharge pressure of the plunger pump 9 is increased by cracking pressure (opening pressure) P ₂ minutes of the check valve 8 the pressure of the. Therefore, since the upstream side and the downstream side of the check valve 8 only have a pressure difference corresponding to the cracking pressure P ₂ of the check valve 8, the behavior of the valve body of the check valve 8 is unstable. At the moment when the valve is opened, the check valve 8 is closed due to the pressure drop on the upstream side of the check valve 8. When the valve is closed, the pressure on the upstream side increases again, and the valve opens again. Occur. As a result, the durability of the check valve 8 is extremely deteriorated, and the reliability of the air storage facility cannot be improved due to early deterioration of the check valve function due to damage to the seat surface or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a structure in which chattering of a check valve is completely prevented from occurring.

[0007]

According to the present invention, when filling the gas in the gas container into the gas reservoir, the gas in the gas container having a pressure lower than the final filling pressure of the gas reservoir is pressurized by a pump. In a gas filling device configured to fill a gas storage via a check valve, an electromagnetic valve provided between the pump and the check valve, a pressure downstream of the check valve and a discharge of the pump A differential pressure from the side pressure is obtained, and when the differential pressure reaches a set differential pressure value that is set higher by a predetermined amount in advance than the cracking pressure of the check valve, the solenoid valve is closed, and the pump is operated. And a valve opening / closing control means for opening the solenoid valve when the discharge side pressure reaches a set pressure value obtained by adding the set differential pressure value to the final filling pressure of the gas accumulator.

[0008]

According to this structure, when the gas is filled in the air accumulator while being pressurized by the pump, the pressure on the discharge side of the pump is set to the final filling pressure P ₁ of the air accumulator by the set differential pressure value P ₃ (the cracking pressure P _The solenoid valve is opened and gas is filled only when the set pressure value P ₄ is obtained by adding a predetermined amount ΔP higher than ₂ ) to the upstream side of the check valve. When the pressure difference between the side (pump discharge side) and the downstream side is set differential pressure value P ₃ is closed solenoid valve filling of gas is stopped. Gas is filled in the gas蓄器this operation to a final fill pressure P ₁ by repeating a plurality of times.

That is, at the start of filling the gas in the gas accumulator, a high set pressure value P ₄ is always added to the final filling pressure P ₁ plus the cracking pressure P _{2 of the} check valve, and the check is performed during the gas filling. are those immediately stop the filling of the gas when the pressure difference between an upstream side and a downstream side of the valve reaches a set differential pressure value P ₃ shrunk, thus setting pressure value P ₃ itself previously cracking pressure P _{2 and} a predetermined amount ΔP (for example, 1 kgf
/ Cm ² ), the pressure difference between the upstream side and the downstream side of the check valve does not become less than or equal to the set differential pressure value P ₃ , which causes chattering of the check valve. There is no occurrence.

[0010]

FIG. 1 is a view showing an embodiment of the present invention, in which parts common to those in FIG. 2 are denoted by the same reference numerals.

As shown in FIG. 1, in the gas filling passage 10 connecting the gas accumulator 2 and the plunger pump 9, on the upstream side of the check valve 8, about 10 liters, which has a significantly smaller capacity than the gas accumulator 2, is provided. An intermediate tank 11 and a solenoid valve 12 having the following capacity are provided. Then, the differential pressure between the pressure on the gas accumulator 2 side downstream of the check valve 8 and the discharge side pressure of the plunger pump 9 upstream of the check valve 8 is detected by the differential pressure detection device 13, while the pressure difference of the plunger pump 9 is detected. Pressure detection device 1 for discharge side pressure
4 for detection.

The differential pressure detecting device 13 described above uses a solenoid valve via a relay 15 when the differential pressure between the pressure on the gas accumulator 2 side and the pressure on the discharge side of the plunger pump 9 reaches a set differential pressure value P _3. 1
2 is provided with a valve closing signal.
The set differential pressure value P ₃ is set to a value obtained by adding the pressure ΔP of about 1 kgf / cm ^2, for example, in cracking pressure P ₂ of the check valve 8, for example. The pressure sensing device 14, to the solenoid valve 12 via the relay 15 when the discharge pressure of the plunger pump 9 reaches the set pressure value P ₄ intended to impart the valve opening signal, setting of the pressure sensing device 14 The pressure value P ₄ is, for example, the final filling pressure P ₁ of the gas storage 2 (31 in this embodiment).
5 kgf / cm ² ) and a value obtained by adding the cracking pressure P ₂ of the check valve 8. The differential pressure detecting device 13, the pressure detecting device 14, and the relay 15 form a valve opening / closing control unit 16 for the electromagnetic valve 12.

Here, the cracking pressure P ₂ of the check valve 8
Is determined by the spring constant of the spring that biases the valve element in the closing direction, and is generally 3.5 kgf / cm ² ,
4.5 kgf / cm ^2, the values of such 6 kgf / cm ² is used.

In the gas filling device thus constructed, the solenoid valve 12 is kept open at the beginning of filling the gas accumulator 2 with the gas cylinder 7 and the gas accumulator without driving the plunger pump 9. The helium gas is filled in the gas storage device 2 using the pressure difference between the storage device 2 and the storage device 2.

After the gas reservoir 2 and the gas cylinder 7 are pressure-balanced, the plunger pump 9 is driven to fill the gas reservoir 2 while increasing the gas pressure. That is, the plunger pump 9 sucks in the helium gas on the side of the gas cylinder 7, pressurizes it, and then discharges it. However, the discharge side pressure of the plunger pump 9 is the set pressure value P ₄ (final filling pressure P of the gas accumulator 2). ₁ (315 kgf / cm ² ) plus the cracking pressure P ₂ of the check valve 8), and when this is detected by the pressure detecting device 14, the solenoid valve 12 opens for the first time.
At the same time, the check valve 8 is opened and the gas reservoir 2 is filled with helium gas.

On the other hand, during the above gas filling, the pressure difference between the pressure on the discharge side of the plunger pump 9 and the pressure on the side of the gas reservoir 2 gradually decreases, and the above pressure difference becomes the set pressure difference value P ₃ (check When the differential pressure detecting device 13 detects the cracking pressure P ₂ of the valve 8 plus a pressure ΔP of about 1 kgf / cm ² ), the solenoid valve 12 closes, and the check valve accordingly. The valve 8 is also closed, and the filling of the gas in the gas reservoir 2 is temporarily stopped.

Even if the solenoid valve 12 is closed and the charging of the gas to the gas accumulator 2 is temporarily interrupted, the plunger pump 9 is still operating continuously, and eventually the discharge side pressure of the plunger pump 9 becomes equal to the set pressure. When the value P ₄ is reached, the solenoid valve 12
It opens, helium gas is filled such an operation care蓄器2 to a final fill pressure P ₁ by repeating a plurality of times.

As described above, according to this embodiment, when charging the gas accumulator 2 with helium gas while increasing the pressure by the plunger pump 9, the check valve 8 is always brought to the final charging pressure P ₁ when the solenoid valve 12 is opened. of while performing stretch filled under cracking pressure P ₂ higher set pressure value P ₄ obtained by adding the, when it becomes an upstream-side and downstream-side setting pressure value P _3, reducing its pressure difference of the check valve 8 the temporarily interrupt the filling of helium gas, in which the upstream side of the discharge pressure of the plunger pump 9 of the check valve 8 is to wait for to recover to the set pressure value P _4.

Therefore, since the set differential pressure value P ₃ itself is set in advance higher than the cracking pressure P ₂ by the predetermined amount ΔP, the pressure difference between the upstream side and the downstream side of the check valve 8 is the set differential pressure value. without it becomes P ₃ below, whereby the chattering of the check valve 8 can be completely prevented.

Here, in the above embodiment, the differential pressure detecting device 1
Although the pressure difference between the upstream side and the downstream side of the check valve 8 is directly detected by 3, the pressure detecting device in place of the differential pressure detecting device 13 detects the pressure on the downstream side of the check valve 8, for example.
The differential pressure is determined while comparing this value with the value of the pressure detection device 14 on the other upstream side, and this differential pressure is determined as the set differential pressure value P ₃
The electromagnetic valve 12 may be closed when it becomes equal to.

Further, the gas filling device shown in the above-mentioned embodiment is for the ground functional test of the rocket hydraulic power source device, and therefore, the test is carried out while the gas filling passage 10 and the like are connected during the test. Become. Further, the gas filling at the launch site of the actual rocket is performed by using a large pressure accumulator (for example, 450 kgf / cm ² ) from the pressure accumulator 2.
Therefore, the problem such as the chattering phenomenon of the check valve does not occur unlike the case of the function test on the ground.

[0022]

As described above, according to the present invention, the differential pressure between the pressure on the downstream side of the check valve and the pressure on the discharge side of the pump is set to be higher than the cracking pressure of the check valve by a predetermined amount in advance. When the set differential pressure value reaches the set differential pressure value, the solenoid valve is closed, and when the discharge side pressure of the pump reaches the set pressure value obtained by adding the set differential pressure value to the final filling pressure of the gas accumulator, the electromagnetic valve is closed. By configuring the valve to open, the pressure difference between the upstream side and the downstream side of the check valve does not become less than the set pressure difference value, and the chattering phenomenon of the check valve can be completely prevented. As a result, there is no functional deterioration due to damage or the like of the seal surface of the check valve, and the reliability of the air storage facility including the check valve is improved.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 2 is a structural explanatory view showing an example of a conventional gas filling device.

[Explanation of symbols]

 2 ... gas storage 7 ... gas cylinder (gas container) 8 ... check valve 9 ... plunger pump 12 ... solenoid valve 13 ... differential pressure detecting device 14 ... pressure detecting device 15 ... relay 16 ... valve opening / closing control means

Claims (1)

(57) [Claims] 1. When filling a gas accumulator with gas in a gas container, the gas in the gas container having a pressure lower than the final filling pressure of the gas accumulator is boosted by a pump and then accumulated through a check valve. In a gas filling device adapted to fill a vessel, an electromagnetic valve provided between the pump and a check valve, and a differential pressure between a pressure downstream of the check valve and a discharge side pressure of the pump is obtained. The solenoid valve is closed when the differential pressure reaches a set differential pressure value that is higher than the cracking pressure of the check valve by a predetermined amount in advance, and the discharge side pressure of the pump is reduced And a valve opening / closing control means for opening the electromagnetic valve when a set pressure value obtained by adding the set differential pressure value to the final filling pressure is added.