JPH039101A - Gas pressure/fluid pressure conversion mechanism - Google Patents

Abstract

PURPOSE:To prevent damage to the packing part due to leak of liquid by providing means for storing overflows of liquid from respective air tanks for taking in and out liquid from first, second chambers of a cylinder in first, second flow tanks, and for returning the liquid to the respective chambers and tanks. CONSTITUTION:First, second air tanks T1, T2 for supplying/discharging liquid to/from first, second chambers Q1, Q2 of a cylinder partitioned by a piston 2 are provided, and overflows of liquid from overflow ports FP1, FP2 are stored in first second flow tanks F1, F2. When the liquid stored in the first, second flow tanks F1, F2 reach a specified volume, first, second floating ball valves B1, B2 are opened to return the liquid in the course of F1 T2, F2 T1. Thus, damage to the packing part due to the shortage of liquid volume caused by lead of liquid from the packing part of the piston 2 can be prevented.

Description

[Detailed description of the invention] [　Industrial application field　]

The present invention relates to a gas pressure/liquid positive conversion mechanism configured to transmit a pressure signal transmitted using gas as a medium to a liquid, and to operate a cylinder by the liquid.

[Conventional technology]

A conventional pneumatic/liquid positive conversion mechanism, for example, a pneumatic/hydraulic conversion mechanism configured to operate a hydraulic cylinder using air pressure, is a double-acting cylinder that is divided into a first chamber and a second chamber by a piston. A first air tank that takes oil in and out of the first chamber by air pressure and a second air tank that takes oil in and out of the second chamber by air pressure are connected, and a pneumatic signal is supplied to the first air tank, and a second air tank is connected to the second air tank that takes oil in and out of the first chamber. The double-acting cylinder was caused to reciprocate by a pneumatic signal supplied to the cylinder.

[Problem to be solved]

However, in the conventional gas pressure/liquid positive conversion mechanism,
If there is a lot of oil leaking from the piston seal,
There is a problem in that the amount of oil in one of the air tanks decreases and air gets mixed into the hydraulic cylinder, causing the hydraulic cylinder to no longer function properly. There is also the problem that it is necessary to replace the damaged piston gasket and return the oil that has migrated due to the leak. In order to prevent such oil leaks, the material of the seal and the inner surface of the cylinder and piston must be extremely precisely machined, but this only increases costs and completely prevents high-pressure oil leaks. It was impossible to prevent it.

[Means to solve the problem]

Therefore, in the gas pressure/liquid positive conversion mechanism according to the present invention, there is provided a cylinder that is divided into a first chamber and a second chamber by a piston, and a cylinder that is divided into a first chamber and a second chamber by a piston. a first air tank that takes liquid in and out of the chamber; a second air tank that takes liquid in and out of the second chamber by gas pressure;
A first overflow port provided at a predetermined position of the air tank, a second overflow port provided at a predetermined position of the second air tank, and a first flow tank that stores liquid overflowing from the first overflow port. a second flow tank that stores the liquid overflowing from the second overflow port; a first return means that returns only the liquid stored in the first flow tank to the second air tank or the second chamber; A measure was taken to include a second return means for returning only the liquid stored in the second flow tank to the first air tank or the first chamber.

[Effect]

In the gas pressure/liquid positive conversion mechanism according to the present invention, when liquid leaks and moves from the first chamber to the second chamber at the packing part of the piston, the amount of liquid in the second air tank increases. A second
When the water passes over the overflow boat, it overflows from the second overflow port and is stored in the second flow tank. The liquid stored in the second flow tank is returned to the first air tank or the first chamber by the second return means. In this way, the liquid that leaked from the first chamber to the second chamber at the seal portion of the piston is returned to the first air tank or the first chamber by the second return means. Conversely, if liquid leaks and moves from the second chamber to the first chamber at the gasket part of the piston, the amount of liquid in the first air tank increases, so the first overflow port provided at a predetermined position of the first air tank increases. When it exceeds this amount, it overflows from the first overflow port and is stored in the first flow tank. The liquid stored in the first flow tank is returned to the second air tank or the second chamber by the first return means. In this way, the liquid that leaked from the second chamber to the first chamber at the piston packing portion is returned to the second air tank or the second chamber by the first return means. As described above, the liquid that leaked between the first chamber side and the second chamber side and moved to the opposite side in the packing part of the piston is returned to the original first chamber by the first return means or the second return means. It is sent back to the side or the second room side.

【 Example 】

The gas pressure/liquid positive conversion mechanism according to the present invention will be explained in detail below based on the drawings. FIG. 1 is a block diagram of a gas pressure/liquid pressure conversion mechanism according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing the operating state of the open gas pressure/liquid pressure conversion mechanism. In the drawings, 1 is a hydraulic cylinder; 2 is a piston that reciprocates within the hydraulic cylinder 1; the interior of the hydraulic cylinder 1 is divided by the piston 2 into a first chamber Q1 and a second chamber Q2. T1 is a first air tank, T2 is a second air tank,
The first chamber Q1 is connected to the bottom of the first air tank T1 by a first boat P1, and the second chamber Q2 is connected to the bottom of the second air tank T2 by a second port P2. Fl is a first flow tank, and oil overflowing from the first overflow port FP1 passes through the first flow tank F1 and is injected into the second air tank T2 from the second injection valve 2. In the first flow tank Fl, there is a floating ball valve B1 which is a sphere having a specific gravity smaller than that of oil.
It comes into close contact with the seat portion S1 and enters a blocking state. F2 is a second flow tank, and oil overflowing from the second overflow port FP2 passes through the second flow tank F2 and is injected into the first air tank T1 from the first injection valve V1. Inside the second flow tank F2 is a spherical floating ball valve B having a specific gravity smaller than that of the oil.
2, and if oil is present in the second flow tank F2, it will be in a floating state of circulation, and if no oil is present, it will be in close contact with the second sheet portion S2 at the bottom and will be in a blocking state. The first.
It constitutes a second return means. In the gas pressure/liquid positive conversion mechanism configured as described above, the first
Air piping for control is connected to the first person's cover X of the air tank TI and the second person's cover Y of the second air tank T2, and dry air A is supplied thereto. Then, when the piston 2 is at the left end return limit position, the first air tank T1 is filled with oil H up to the level of the first overflow port FP1, and the second air tank T2 is filled with the second injection valve V2. Oil H until it is immersed.
is filled, and the first seat portion S1 and the second injection valve
2, and the second sheet portion S2 and the first
The piping 4 between the injection valve ■l is also filled with oil H. At this time, when the piston 2 is moved to the right forward movement limit position R, the second air tank T2 is filled with oil H up to the level of the second overflow port FP2, and the first air tank T2 is filled with oil H to the level of the second overflow port FP2.
The air tank TI is filled with oil H to the point where the first injection valve (1) is immersed. Therefore, when the air pressure of the first human-powered port Move in the direction of the movement limit position. The gas pressure/liquid positive conversion mechanism of the present invention basically operates in the same manner as the conventional one as described above, but in these cylinders, due to manufacturing precision, wear, etc. Oil H may leak to the low pressure side. For example, when the piston 2 is located at the position shown in FIG. 1, if the oil level of the first air tank T1 is
The oil level in the second air tank T2 rises by an amount corresponding to the leaked oil d. When such leaks overlap and the oil amount in the second air tank T2 increases, when the piston 2 is moved toward the right end return movement limit position R, 1. The leaked oil H overflows from the second overflow port FP2, flows into the second flow tank F2, and floats the second floating pole valve B2. Next, when the pressure in the second air tank Y is increased, the oil level in the second air tank T2 decreases, as shown in FIG. At the same time, the leaked oil accumulated in the second flow tank F2 is pushed out to the first air tank T1 through the first injection valve v1, and the second floating ball valve B2 is lowered to 2. It comes into close contact with the second sheet portion S2. In this way, oil leaked from the first chamber Q1 side to the second chamber Q2 side is transferred to the second air tank T2 and the second flow tank F2.
Since the oil is returned to the first air tank T1 through the air tank T1, movement of oil due to leakage is offset. The above explanation is based on the case where leakage occurs from the first chamber Q1 side to the second chamber Q2 side, but conversely, from the second chamber Q2 side to the first chamber Q2 side.
The case where the leakage occurs to the first side can be explained in the same manner as above, so the explanation will be omitted. As described above, according to the gas pressure/liquid positive conversion mechanism according to the present invention, the oil leaked between the first chamber and the second chamber in the piston packing part is returned to the original part, so that the oil leakage is prevented. Oil migration due to this will be compensated. Therefore, it is possible to prevent the oil amount from decreasing in either of the air tanks Tl or T2, causing air to enter the first chamber Q1 or the second chamber Q2 of the cylinder L, which would prevent the cylinder from functioning properly and damage the gasket. . Therefore, it is possible to provide an extremely reliable gas pressure/liquid positive conversion mechanism. Further, since it is not necessary to process the packing material and the inner surface of the cylinder 1 and the piston 2 with extreme precision, it is possible to provide the gas pressure/liquid positive conversion mechanism that achieves the above effects at a low cost.

【 effect 】

According to the gas pressure/liquid positive conversion mechanism according to the present invention, the oil leaked between the first chamber and the second chamber in the piston packing part is returned to the original part, so that the liquid in either air tank is returned to the original part. It is possible to prevent gas from entering the cylinder and causing the cylinder to malfunction and damage the seal. Therefore, it is possible to provide an extremely reliable gas pressure/liquid positive conversion mechanism. Further, since it is not necessary to process the packing material, the inner surface of the cylinder, and the piston extremely precisely, it is also possible to provide the gas pressure/liquid positive conversion mechanism that achieves the above-mentioned effects at a low cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a gas pressure/liquid pressure conversion mechanism according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing the operating state of the open gas pressure/liquid pressure conversion mechanism. 1... Hydraulic cylinder 2... Piston, Ql...
・First chamber, Q 2-...Second chamber, TI...First air tank, T2...Second air tank, F 1-...First flow tank, F2...Second flow tank, F P 1
-...First overflow port, FP2...Second overflow port, B1...First floating ball valve (first return means), B2...Second floating pole valve (second return means) .

Claims (1)

[Claims] (1) A cylinder that is divided into a first chamber and a second chamber by a piston, a first air tank that moves liquid into and out of the first chamber by gas pressure, and a liquid that moves liquid into and out of the second chamber by gas pressure. a second air tank, a first overflow port provided at a predetermined position of the first air tank, a second overflow port provided at a predetermined position of the second air tank, and overflow from the first overflow port. a first flow tank that stores liquid; a second flow tank that stores liquid overflowing from the second overflow port; and only the liquid stored in the first flow tank to the second air tank or the second chamber. A gas pressure/liquid pressure conversion characterized by comprising: a first return means for returning liquid; and a second return means for returning only the liquid stored in the second flow tank to the first air tank or the first chamber. mechanism.