JP2893675B2 - Pressure gauge inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure gauge testing device used for calibrating a high pressure Bourdon tube pressure gauge, pressure sensor, or the like.

[0002]

2. Description of the Related Art Conventionally, a pressure gauge inspection apparatus of this type inspects a pressure gauge by pressurizing with a liquid such as oil or water. Also, a high-pressure gas such as a high-pressure nitrogen gas is supplied to one of the bellows that partitions the casing, and a liquid such as oil or water is provided to the other of the bellows. There is also a pressure gauge inspection apparatus for applying the pressure of the pressure gauge to the pressure gauge to inspect the pressure gauge. However, the pressure gauge inspection apparatus using the high-pressure gas has a problem that it is large-scale, expensive, and uncommon.

[0003]

In the prior art for directly inspecting a pressure gauge with the liquid, for example, in the case of a Bourdon tube pressure gauge, there is a possibility that a liquid such as oil or water may flow into the Bourdon tube. Cannot be used under oil-free and water-free conditions. In addition, in the case of this conventional technique, there is a problem that reduction in size and weight cannot be achieved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pressure gauge inspection apparatus which can solve the above problems and can be inspected in oil-free and water-inhibited states, and can be reduced in size and weight.

[0005]

According to a first aspect of the present invention, there is provided a pressure gauge inspection apparatus, wherein a first piston is provided in a first cylinder chamber, and the first piston communicates with a tip of the first cylinder chamber. A second cylinder chamber having the same diameter as the first cylinder chamber, a second piston capable of pressing the first piston is provided in the second cylinder chamber, and a base end of the first cylinder chamber is provided. Is connected to an oil pump, and a gas discharge passage communicating with a measurement pressure gauge and a gas supply source is connected to a base end side of the second cylinder chamber.

[0006] A pressure gauge inspection device according to a second aspect of the present invention provides a pressure gauge inspection device comprising:
A first end of a second cylinder chamber having the same diameter as the first cylinder chamber is provided in communication with a first end of the first cylinder chamber.
A piston is provided from the cylinder chamber to the second cylinder chamber, an oil pump is connected to the base end of the first cylinder chamber, and a measurement pressure gauge and a gas supply source are connected to the base end of the second cylinder chamber. Is connected to a gas discharge passage communicating with the gas discharge passage.

[0007]

According to the structure of the first aspect, when a high pressure gas is supplied from a gas supply source by attaching a measurement pressure gauge to the gas flow passage, the second piston presses the first piston, and the first piston is pressed. It is pushed down to the proximal end. Thereafter, when the gas supply source is closed and the first piston is pressed by the oil pump, the first piston presses the second piston, and a compressed gas having a higher pressure than the high-pressure gas is generated in the second cylinder chamber. The compressed gas can be supplied to the measurement pressure gauge via the gas discharge path to perform a pressure test.

According to the second aspect of the present invention, when a high pressure gas is supplied from a gas supply source by attaching a measurement pressure gauge to the gas flow passage, the piston is pushed down to the base end side of the first cylinder chamber. Then, when the gas supply source is closed and the piston is pressed by the oil pump, the piston moves to the base end side of the second cylinder chamber, and a compressed gas having a higher pressure than the high-pressure gas is generated in the second cylinder chamber. Is supplied to the measurement pressure gauge through the gas discharge path, and the pressure can be checked.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. A first cylinder chamber 2 is provided on one side of the cylinder 1, and a second cylinder chamber 3 having the same diameter is provided on the other side of the cylinder 1.
The tip of the cylinder chamber 2 and the tip of the second cylinder chamber 3 communicate with each other. Screws 2A and 3A are formed on the outer periphery of the base end of the first cylinder chamber 2 and the second cylinder chamber 3 of the cylinder 1. Reference numerals 4 and 5 denote plugs for closing the first cylinder chamber 2 and the second cylinder chamber 3. Reference numerals 43 and 53 denote lids for fixing the plugs 4 and 5, respectively. One end of each of the plugs 4 and 5 has a diameter substantially the same as that of the cylinder chamber, and grooves 41 and 51 are formed in the outer periphery thereof.
Is installed. On the other hand, the other end has a small diameter, and an oil suction passage 11 is connected to the first cylinder chamber 2 side, and a gas discharge passage 12 is connected to the second cylinder chamber 3 side. One side of the lids 43, 53 has a diameter slightly smaller than the outer diameters of the first and second cylinder chambers 2, 3, and the inner surface thereof has the screws 2A, 3A at the base end of the cylinder 3 and the screws. Formable screw grooves 43A, 53A are formed, and on the other side are formed opening portions 44, 54 and taps 45, 55 which can be fitted to the other side of the plugs 4, 5. I have. Here, 46 and 56 are screws for fixing the lids 43 and 53.

In the first cylinder chamber 2, a first piston 6 is slidably provided. A second piston 7 is slidably provided in the second cylinder chamber 3. Further, a first communication hole 13 to which an oil flow passage 11 is connected is formed at a base end side of the first cylinder chamber 2, and a gas flow passage is formed in the lid 5 of the second cylinder chamber 3.
A second communication hole 14 to which the connection 12 is made is formed. 61, 71
Is a sealing material such as an O-ring that keeps the first cylinder chamber 2 and the second cylinder chamber 3 airtight. Further, an annular joint 8 that connects the first and second cylinder chambers 2 and 3 is provided at a position where the first and second cylinder chambers 2 and 3 come into contact with each other. 81 is an exhaust hole.

Next, the flow paths of the high-pressure nitrogen gas as a high-pressure gas and the oil will be described. First, a description will be given of an oil flow path. A first pipe 16 is connected to an oil pump 15, and a tip of the first pipe 16 is connected to the first communication hole 13. The first pipe 16 has a first branch pipe.
The first branch pipe 17 is provided with a first manual valve 18. The tip of the branch pipe 17 is an oil pump.
It is connected to 15 oil tanks 15A. Then, an oil supply path 11 from the oil pump 15 to the first communication hole 13 is formed. Reference numeral 151 denotes a handle of the oil pump 15, 152 denotes a cylinder, and 153 denotes a link mechanism. In this oil pump 15, handle 15
When 1 is moved up and down via the link mechanism 153, oil is pumped from the oil tank 15A to the cylinder 152 and supplied to the oil supply path 11. To describe the flow path of the high-pressure nitrogen gas, a second pipe 21 having a second manual valve 22 is connected to a gas cylinder 19 of the high-pressure nitrogen gas via a pressure reducing valve 20. It is connected to the second communication hole 14. The second tube 22 has a second
A standard pressure gauge 24 and a measurement pressure gauge 25 are connected to the second branch pipe 23, and the measurement pressure gauge 25 is provided with a third manual valve 26. I have. The gas discharge passage 12 extending from the second communication hole 14 to the standard pressure gauge 24
Is formed.

The operation of the above configuration will be described. First, the first manual valve 18 is opened, and the pressure reducing valve 20 of the gas cylinder 19 is adjusted to a predetermined pressure while the second manual valve 22 and the third manual valve 26 are closed. Next, the second manual valve 22 is opened while the first manual valve 21 is opened. For this purpose, high-pressure nitrogen gas is supplied to the second cylinder chamber 3 via the second pipe 21,
The second piston 7 moves to the first cylinder chamber 2 side,
Finally, the first piston 6 contacts the first piston 6.
And both move integrally to the first cylinder chamber 2 side. At this time, the air between the first piston 6 and the second piston 7 is exhausted from the exhaust hole 81. Since the first manual valve 18 is open, the oil O in the first cylinder chamber 2 flows through the first communication hole 13, the first pipe 16, and the first branch pipe 17 to the oil tank 15A. Refluxed. Next, when the first manual valve 18 and the second manual valve 22 are closed and the oil pump 15 is operated, the first piston 6 presses the second piston 7, and both are integrally formed as the first piston. The high-pressure nitrogen gas moving to the second cylinder chamber 3 side and remaining in the second cylinder chamber 3 is compressed to a higher pressure, and this high-pressure nitrogen gas flows through the compressed gas discharge passage 12 and the second branch pipe 23. Via standard pressure gauge
32. The pressure is transmitted to the measurement pressure gauge 25, and a pressure test can be performed by comparing these indicated pressures. At this time, since the first cylinder chamber 2 is pressurized by the oil pump 15, the high-pressure nitrogen gas on the second cylinder chamber 3 side can be pressurized according to the capacity of the oil pump 15. The oil pump 15 has a maximum compression capacity of 250 kg / cm.
A material having a pressure of about 2 G (gauge pressure), preferably about 350 kg / cm 2 G is used. Thus, for example, a maximum compression capacity of 350 kg
If an oil pump of / cm2G is used, the pressure rise on the side of the second cylinder chamber 3 can be within a range of up to 350 kg / cm2. When the first manual valve 18 is opened after the inspection for the pressure increase is sequentially performed in this manner, the oil in the first cylinder chamber 2 is discharged and reduced in pressure, and at the same time, the standard pressure gauge 24 and the measured pressure are measured. A pressure drop test can be performed by comparing the indicated pressures of the total 25. Note that by opening the third manual valve 26, it can be replaced with another measurement pressure gauge (not shown). After the end of the test, the main valve 19A or the pressure reducing valve 20 of the gas cylinder 19 is closed, the third manual valve 26 is opened, and the inside of the second cylinder chamber 3 and the second pipe 21 and the second branch pipe are opened. The nitrogen gas in 23 is released into the atmosphere, the presence or absence of residual pressure in the device is confirmed, and the inspection is completed.

As described above, in the above embodiment, the first
A first piston 6 is provided in the cylinder chamber 2 of the
A second cylinder chamber 3 having the same diameter as the first cylinder is provided in communication with the front end of the second cylinder chamber 2, and the second piston is capable of pressing the first piston against the second cylinder chamber 3. A piston 7 is provided, an oil pump 15 is connected to the base end of the first cylinder chamber 2, and a gas cylinder 19 and a measuring pressure gauge 25 are set to the base end of the second cylinder chamber 3.
The first piston 6 is pressed by an oil pump 15 to compress the high-pressure nitrogen gas in the second cylinder chamber 3 to a higher pressure, and this is compressed by a measuring pressure gauge 25. Can be inspected in oil-free and water-free conditions. Further, since the high-pressure nitrogen gas in the second cylinder chamber 3 is compressed by the oil pump 15, the high-pressure nitrogen gas can be compressed to an extremely high pressure. Also, by performing compression by the pressure of the oil bomb 15,
The device can be further miniaturized, and the device can be simplified.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The second embodiment of the present invention is the same as FIG. 2 in the first embodiment. The feature of the second embodiment lies in its piston.

In the second embodiment of the present invention, a piston 60 is slidably provided in both the first cylinder chamber 2 and the second cylinder chamber 3. The piston 60
In the first cylinder chamber 2 side, a sealing material such as an O-ring
61 are provided in two layers so as to keep the second cylinder chamber 3 filled with oil tight. Also,
A sealing material 62 such as an O-ring is also provided on the second cylinder chamber 3 side.
Is provided.

The operation of the above configuration will be described. First, the first manual valve 18 is opened, and the pressure reducing valve 20 of the gas cylinder 19 is adjusted to a predetermined pressure while the second manual valve 22 and the third manual valve 26 are closed. Next, the second manual valve 22 is opened while the first manual valve 21 is opened. For this purpose, high-pressure nitrogen gas is supplied to the second cylinder chamber 3 via the second pipe 21,
The piston 60 moves to the first cylinder chamber 2 side. At this time, since the first manual valve 18 is in the open state, the oil O in the first cylinder chamber 2 flows through the first communication hole 13, the first pipe 16, the first pipe 16,
Is returned to the oil tank 15A through the branch pipe 17. Next, when the first manual valve 18 and the second manual valve 22 are closed and the oil pump 15 is operated, the piston 60 moves to the second cylinder chamber 3 side and remains in the second cylinder chamber 3. The high-pressure nitrogen gas that has been compressed is further compressed to a higher pressure, and this high-pressure nitrogen gas is transmitted to the standard pressure gauge 32 and the measurement pressure gauge 25 via the compressed gas discharge path 12 and the second branch pipe 23, and
A pressure test can be performed by comparing these indicated pressures. When the first manual valve 18 is opened after the inspection for the pressure increase is sequentially performed in this manner, the oil in the first cylinder chamber 2 is discharged and reduced in pressure, and at the same time, the standard pressure gauge 24 is opened.
And the indicated pressures of the measurement pressure gauge 25 are compared to perform a pressure drop test. Note that by opening the third manual valve 26, it can be replaced with another measurement pressure gauge (not shown). After the test, the main valve 19A or the pressure reducing valve 20 of the gas cylinder 19 is closed, the third manual valve 26 is opened, and the second
, A second pipe 21 and a second branch pipe 23
The nitrogen gas in the inside is released to the atmosphere, the presence or absence of residual pressure in the apparatus is confirmed, and the inspection is terminated.

As described above, in the second embodiment, the tip of the second cylinder chamber 3 having the same diameter as the first cylinder is provided so as to communicate with the tip of the first cylinder chamber 2. A piston 60 is provided from the cylinder chamber 2 to the second cylinder chamber 3, an oil pump 15 is connected to the base end of the first cylinder chamber 2, and a gas cylinder is connected to the base end of the second cylinder chamber 3. 19 is connected to the gas discharge passage 12 communicating with the measurement pressure gauge 25, and the piston 60 is pressed by the oil pump 15 so that the second cylinder chamber 3
The high-pressure nitrogen gas inside is further compressed to a higher pressure and transmitted to the measuring pressure gauge 25, whereby the inspection can be performed in oil-free and water-free conditions. Further, since the high-pressure nitrogen gas in the second cylinder chamber 3 is compressed by the oil pump 15, the high-pressure nitrogen gas can be compressed to an extremely high pressure. Further, by performing the compression by the pressure of the oil pump 15, the size of the device can be further reduced, and further, the device can be simplified. In addition, since only one piston 60 is required, the number of parts of the apparatus can be reduced.

The present invention is not limited to the first and second embodiments, but can be variously modified within the scope of the present invention. For example, it is also possible to provide a manual valve immediately before the through hole 12 of the gas discharge path 14. By providing a manual valve at such a position, both the standard pressure gauge 24 and the measurement pressure gauge 25 can be replaced. Further, in the first and second embodiments, the first cylinder chamber 2 and the second cylinder chamber 3 are formed by separate members and are joined by the joints 8. The chamber 2 and the second cylinder chamber 3 may be formed integrally.

[0019]

According to a first aspect of the present invention, a first piston is provided in a first cylinder chamber, and a second piston having the same diameter as the first cylinder chamber communicates with a tip of the first cylinder chamber. Providing a tip of a cylinder chamber, a second piston capable of being pressed by the first piston in the second cylinder chamber, and connecting an oil pump to a base end side of the first cylinder chamber; A pressure testing device in which a measurement pressure gauge and a gas discharge passage communicating with a gas supply source are connected to a base end side of a second cylinder chamber, wherein a base end side of the first cylinder chamber has a groove on an outer periphery. A plug provided with a sealing material in the groove and having a communication hole connected to the oil pump is inserted therein, and is further closed by screwing a lid on the outside of the plug. The proximal end of the second cylinder chamber is A plug having a groove on the outer periphery and provided with a sealing material in the groove and having a communication hole connected to the gas discharge passage is inserted, and a lid is screwed to the outside of the plug. Therefore, the inspection can be performed in the oil-free and water-free state, and the size and weight can be further reduced. Particularly, since the gas in the second cylinder chamber is compressed by the oil pump, the gas can be compressed to an extremely high pressure. Further, by compressing the gas in the second cylinder chamber by the pressure of the oil bomb, the size of the apparatus can be further reduced, and the apparatus can be simplified.

The second cylinder chamber may be provided with a tip of a second cylinder chamber having the same diameter as the first cylinder chamber in communication with the tip of the first cylinder chamber. A piston is provided across the cylinder chamber, an oil pump is connected to the base end of the first cylinder chamber, and a gas discharge passage communicating with a measurement pressure gauge and a gas supply source is provided at the base end of the second cylinder chamber. Wherein the base end side of the first cylinder chamber has a groove on the outer periphery, a sealing material is provided in the groove, and a communication hole connected to the oil pump is formed. The plug body is inserted and further closed by screwing a lid body on the outside of the plug body. The base end side of the second cylinder chamber has a groove on the outer periphery and seals the groove. Material is provided and said A plug with a communication hole connected to the body discharge passage is inserted, and further closed by screwing a lid on the outside of the plug. It is possible to further reduce the size and weight. Particularly, since the gas in the second cylinder chamber is compressed by the oil pump, the gas can be compressed to an extremely high pressure. Also, by compressing the gas in the second cylinder chamber by the pressure of the oil bomb,
The device can be further miniaturized, and the device can be simplified. In particular, the number of parts can be reduced as compared with the first aspect.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a first embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing the first embodiment of the present invention.

FIG. 4 is a schematic explanatory view showing a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a second embodiment of the present invention.

[Explanation of Signs] 2 First cylinder chamber 3 Second cylinder chamber 4,5 Plug 6 First piston 7 Second piston 11 High-pressure gas supply path 12 Gas discharge path 19 Gas cylinder (gas supply source) 25 Measurement Pressure gauge 41, 51 Groove 42, 52 Seal material 43, 53 Lid

Claims (2)

(57) [Claims] 1. A first piston is provided in a first cylinder chamber, and a front end of a second cylinder chamber having the same diameter as the first cylinder chamber is provided in communication with a front end of the first cylinder chamber. A second piston pressable by the first piston is provided in the second cylinder chamber, and an oil pump is connected to a base end of the first cylinder chamber, and a base end of the second cylinder chamber is provided. a pressure test apparatus connected to the gas discharge passage that communicates with the measured pressure gauge and a gas supply source to the side
The base end side of the first cylinder chamber has a groove on the outer periphery.
A sealing material is provided in the groove and the oil
A plug with a communication hole connected to the pump is inserted,
Furthermore, the lid is screwed to the outside of the stopper to close it.
And the proximal end of the second cylinder chamber is
With a groove on the circumference and a sealant provided in the groove
A plug having a communication hole connected to the gas discharge path is inserted.
And the lid is screwed to the outside of the plug.
Pressure gauge inspection device characterized by being blocked by a pressure gauge
Place. 2. A second cylinder chamber having the same diameter as the first cylinder chamber is provided in communication with the first cylinder chamber, and a piston extends from the first cylinder chamber to the second cylinder chamber. And a pressure test in which an oil pump is connected to the base end of the first cylinder chamber, and a measurement pressure gauge and a gas discharge passage communicating with a gas supply source are connected to the base end of the second cylinder chamber. A device,
The proximal end side of the first cylinder chamber has a groove on the outer periphery.
A seal material is provided in the groove and the oil pump
The plug with the communication hole connected to the plug is inserted and
Is closed by screwing the lid outside the stopper.
The base end side of the second cylinder chamber is located on the outer periphery.
A groove having a sealing material provided in the groove;
A plug with a communication hole connected to the gas exhaust passage is inserted.
And a lid is screwed onto the outside of the plug.
A pressure gauge inspection device characterized by being closed.