JP2003270107A - Method and device for pressure-proof test of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a required filling time from the start of filling a liquid filled in a pipe up to the finish of the filling. <P>SOLUTION: This method includes a process wherein the liquid is supplied into the pipe A from one end of the pipe A of which the both ends are laid laterally, using a liquid supplying body having a supplied-liquid outlet 31b faced to an inner bottom in a position in the vicinity of the inner bottom of the pipe, so as to heighten a liquid level in the pipe A, and a process for increasing liquid pressure in the pipe A filled with the liquid by heightening the liquid level. The liquid is supplied from the supplied-liquid outlet 31b toward the inner bottom a of the pipe A to reduce entrainment of remaining air left inside the pipe A until the supplied-liquid outlet 31b is submerged, the supplied-liquid outlet is submerged in a low liquid level, and the liquid is supplied continuously without generating the entrainment of the remaining air, after the supplied-liquid outlet 31b is submerged. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure resistance test method and pressure resistance test apparatus for a pipe to which internal pressure is applied such as a liquid feed pipe for feeding a pressure liquid generated by a pressure liquid source such as a pump.

[0002]

2. Description of the Related Art A pipe such as a liquid feeding pipe to which an internal pressure is applied is filled with a liquid after completion of manufacturing, and a pressure test is performed by increasing the liquid pressure in the pipe.

FIG. 4 is a schematic diagram showing the structure of a conventional withstand voltage test apparatus. This pressure resistance test apparatus includes a liquid supply unit 10 communicating with a liquid supply source 102 via a liquid supply pipe 100 and an opening / closing valve 101.
3, a first sealing body 104 that seals one end of a pipe A that is horizontally placed so that both ends are located on the left and right, and an on-off valve 105.
A second sealing body 107 that has an exhaust hole 106 that is opened and closed by means of the second sealing body 107 that seals the other end of the pipe A, and the inside of the pipe A that is connected in the middle of the liquid supply pipe 100 and is filled with liquid. And a pressure increasing means 108 for increasing the liquid pressure. The liquid supply section 10
The liquid supply outlet 103a of No. 3 is located at the central portion of the sealing portion of the first sealing body 104, in other words, at the central portion of the pipe A.
Open in the longitudinal direction. Further, the pressure increasing means 108 is
The rod-shaped fluid pressure cylinder 109 and the reservoir 110 in which the rod 110 of the fluid pressure cylinder 109 is inserted and the inside of which is filled with a liquid are provided, and the capacity of the reservoir 110 is changed by the rod 110. The liquid pressure in the pipe A is increased via the liquid in the liquid reservoir 111 and the liquid supply pipe 100.

Then, the withstand pressure test of the pipe A is performed by the withstand pressure test apparatus constructed as described above. This pressure resistance test is performed in the next step. FIG. 5 is a schematic view showing a step in the middle of a conventional withstand voltage test method. (1) The first sealing body 1 is attached to one end of a pipe A whose both ends are placed horizontally.
04 is fitted and fixed, the second sealing body 107 is fitted and fixed to the other end, and both ends of the pipe A are sealed. Further, the on-off valve 1
The exhaust hole 106 is opened by 05. (2) Next, the liquid supply source 102 to the liquid supply pipe 100 and the opening / closing valve 10
1 and the liquid supply unit 103 to supply the liquid from the center of the pipe A to the inside of the pipe A to increase the internal liquid level in the radial direction and discharge the residual air inside from the exhaust hole 106 to the outside.
The tube A is filled with the liquid. (3) Thereafter, the exhaust port 10 is opened by the on-off valve 105.
6 is closed and the liquid supply unit 103 is opened by the on-off valve 101.
Then, the fluid pressure cylinder 109 of the pressure increasing means 108 is operated to increase the fluid pressure in the pipe A filled with the fluid. Then, the pass / fail of the pipe A is determined by the presence or absence of liquid leakage, liquid bleeding, cracks, etc., based on the result of the pressure resistance test.

[0005]

However, when liquid is supplied to the inside of the pipe A from the liquid supply outlet 103a that is opened in the axial direction of the pipe A at the central position of the pipe A as in the conventional case,
The liquid is jetted from the liquid supply outlet 103a toward the entire inner circumference of the pipe A (see FIG. 4), and this jet entrains the residual air in the pipe A, and this residual air mixes with the liquid, and Since it becomes difficult for the air to be exhausted from the exhaust hole 106, after supplying a predetermined amount of liquid, this liquid supply is stopped, and after the liquid in the pipe A and the residual air are separated, the liquid supply is restarted. Even at the time of this restart, the jet flow ejected from the liquid supply outlet 103a into the pipe A entrains the residual air in the pipe A, and the residual air mixes with the liquid. ,
This liquid supply is suspended again. Since the liquid is filled into the pipe A by repeating the supply of liquid into the pipe A and the rest, the filling time required from the start of filling to the completion of filling becomes relatively long, and the pressure resistance test efficiency is improved. Was requested.

The present invention has been made in view of the above circumstances, and by supplying a liquid by using a liquid supply having a liquid supply outlet at a position near the inner bottom of a pipe whose both ends are placed horizontally,
It is possible to reduce the entrainment of residual air until the liquid supply outlet is submerged, and it is possible to cause the liquid supply outlet to submerge at a low liquid level, without the residual air being entrained after the liquid supply outlet is submerged. It is possible to supply liquid continuously,
An object of the present invention is to provide a pressure resistance test method and pressure resistance test apparatus capable of shortening the required filling time.

[0007]

A pressure resistance test method according to a first aspect of the invention is a method for testing a pressure resistance of a pipe by filling a liquid inside a pipe whose both ends are laterally placed and testing the pressure resistance of the pipe. A step of supplying a liquid to the inside of the pipe using a liquid supply having a liquid supply outlet in the vicinity of the inner bottom of the pipe, and raising the liquid level without entraining residual air in the pipe after the liquid supply outlet is submerged; The step of increasing the liquid pressure in the tube filled with the liquid by increasing the pressure.

According to the first aspect of the invention, when the liquid is supplied from the liquid supply section into the pipe, the liquid supply outlet of the liquid supply section is located at a position near one end of the pipe and near the inner bottom of the pipe. Since it jets out to a position near the inner bottom of the pipe, the liquid surface will be wavy until the liquid supply outlet submerges, but it is possible to reduce the entrapment of residual air in the pipe and discharge the residual air from the exhaust hole. The liquid supply outlet can be submerged easily at a low liquid level. After the liquid supply outlet is submerged, the liquid can be continuously supplied without entraining residual air, and the pipe can be quickly filled with the liquid. After the liquid is filled, the pressure resistance test of the pipe can be performed by increasing the liquid pressure in the pipe by the pressure increasing device with the exhaust hole closed by the opening / closing device.

The pressure resistance test method according to the second aspect of the present invention is a method for testing the pressure resistance of a pipe by filling the inside of a pipe whose both ends are placed sideways with liquid, and supplying the liquid from one end of the pipe facing the inner bottom of the pipe. A liquid is supplied to the inside of the pipe using a liquid supply having a liquid outlet, and after the liquid supply outlet is submerged, a step of increasing the liquid level without entraining residual air in the pipe; Increasing the hydraulic pressure in the filled tube.

According to the second aspect of the invention, when the liquid is supplied from the liquid supply unit into the pipe, the liquid supply outlet of the liquid supply unit faces the inner bottom of the pipe, and the liquid supply outlet faces the inner bottom of the pipe. Since the water is jetted out, it is possible to reduce the waviness of the liquid surface until the liquid supply outlet is submerged, and it is possible to reduce the entrapment of the residual air in the pipe, and to easily discharge the residual air from the exhaust hole, Moreover, the liquid supply outlet can be submerged without reducing the diameter of the liquid supply outlet. After the liquid supply outlet is submerged, the liquid can be continuously supplied without entraining residual air, and the pipe can be quickly filled with the liquid. After the liquid is filled, the pressure resistance test of the pipe can be performed by increasing the liquid pressure in the pipe by the pressure increasing device with the exhaust hole closed by the opening / closing device.

In the pressure resistance test method according to the third invention, in the step of increasing the liquid pressure in the pipe, a rod body is inserted into the pipe from one end or the other end of the pipe to reduce the liquid filling volume in the pipe, and the rod. A pressure intensifier having a moving mechanism for moving the body is used.

In the third aspect of the invention, since the tube for performing the pressure resistance test also functions as the liquid reservoir of the above-described conventional pressure increasing means, the pressure resistance test can be performed without using the liquid reservoir.

A pressure resistance test apparatus according to a fourth aspect of the present invention includes a first sealing body which has a liquid supply portion and seals one end of the pipe, a second sealing body which seals the other end of the pipe, and an opening / closing mechanism. Pressure test of a pipe provided with an exhaust hole which is opened and closed by a means and is provided in the first sealing body and / or the second sealing body, and a pressure increasing means for increasing the liquid pressure in the pipe filled with the liquid. In the apparatus, the liquid supply part has a liquid supply outlet opening at one position in the circumferential direction at a position near the inner peripheral surface of the pipe when the first sealing body seals one end of the pipe.

According to the fourth aspect of the invention, when the first sealing body seals one end of the pipe, the liquid supply outlet of the liquid supply portion opens at a position near the inner peripheral surface of the pipe, and the liquid supply portion moves from the liquid supply portion to the pipe. When supplying liquid to the inside, the liquid can be jetted from the liquid supply outlet along the inner bottom of the pipe, so the liquid surface will be wavy until the liquid supply outlet submerges, but the liquid remains inside the pipe. Air entrapment can be reduced, residual air can be easily discharged from the exhaust hole, and the liquid supply outlet can be submerged at a low liquid level. After the liquid supply outlet is submerged, the liquid can be continuously supplied without entraining residual air, and the pipe can be quickly filled with the liquid. After the liquid is filled, the pressure resistance test of the pipe can be performed by increasing the liquid pressure in the pipe by the pressure increasing device with the exhaust hole closed by the opening / closing device.

A pressure resistance test apparatus according to a fifth aspect of the present invention includes a first sealing body which has a liquid supply portion and seals one end of a pipe, a second sealing body which seals the other end of the pipe, and an opening / closing mechanism. Pressure test of a pipe provided with an exhaust hole which is opened and closed by a means and is provided in the first sealing body and / or the second sealing body, and a pressure increasing means for increasing the liquid pressure in the pipe filled with the liquid. In the apparatus, the liquid supply part has a liquid supply outlet facing the inner peripheral surface of the pipe at one position in the peripheral direction of the pipe when the first sealing body seals one end of the pipe.

In the fifth aspect of the invention, when the first sealing body seals one end of the pipe, the liquid supply outlet can face the inner bottom of the pipe. In this way, when liquid is supplied from the liquid supply part to the inside of the pipe with the liquid supply outlet facing the inner bottom of the pipe, the liquid can be jetted from the liquid supply outlet toward the inner bottom of the pipe. , It is possible to reduce the waving of the liquid surface until the liquid supply outlet is submerged, and it is possible to reduce the entrapment of the residual air in the pipe, which makes it easier to discharge the residual air from the exhaust hole, and The liquid supply outlet can be submerged without reducing the diameter of the outlet. After the liquid supply outlet is submerged, the liquid can be continuously supplied without entraining residual air, and the pipe can be quickly filled with the liquid. After the liquid is filled, the pressure resistance test of the pipe can be performed by increasing the liquid pressure in the pipe by the pressure increasing device with the exhaust hole closed by the opening / closing device.

In the pressure resistance test apparatus according to a sixth aspect of the present invention, the liquid supply section is provided with a liquid supply passage having a liquid supply inlet, and between a position communicating with the liquid supply passage and the liquid supply outlet. It is characterized in that it is composed of a curved tubular body.

In the sixth aspect of the invention, since the liquid supply outlet portion of the liquid supply portion is formed of a cylindrical body, it is possible to obtain the liquid supply outlet facing the inner peripheral surface of the pipe by mounting this cylindrical body. It is possible to reduce the cost of the withstand voltage test device.

In a pressure resistance test apparatus according to a seventh aspect of the present invention, the pressure increasing means moves a rod body that penetrates the first sealing body or the second sealing body and is inserted into the pipe, and the rod body. And a moving mechanism for moving.

In the seventh aspect of the invention, since the pipe for performing the pressure resistance test also serves as the liquid reservoir of the above-mentioned conventional pressure boosting means, a pressure resistance testing apparatus is provided as compared with a device using the pressure boosting means having the liquid reservoir. The structure can be simplified and the cost can be reduced.

A pressure resistance test apparatus according to an eighth aspect of the present invention is characterized in that the liquid supply portion and the exhaust hole are provided in the first sealing body or the second sealing body through which the rod does not penetrate.

According to the eighth aspect of the invention, since the first sealing body or the second sealing body can be provided with a penetrating hole for the rod regardless of the liquid supply portion and the exhaust hole, it corresponds to the pipe. It is possible to use rods having different thicknesses, and it is possible to increase the pressure without increasing the amount of movement of the rods.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings showing the embodiments thereof. First Embodiment FIG. 1 is a schematic diagram showing the configuration of the first embodiment of the pressure resistance testing apparatus for a pipe according to the present invention.

This pressure resistance tester tests the pressure resistance of a circular pipe A to which internal pressure is applied, such as a liquid feed pipe for feeding a pressure liquid generated by a pressure liquid source such as a pump, and is used for supplying water to a water tank or the like. Liquid source 1
A liquid supply pipe 2 and an opening / closing valve 1 provided in the middle of the liquid supply pipe 2
0 has a liquid supply part 31 communicating with each other and has a first sealing body 3 that seals one end of the pipe A whose both ends are horizontally placed, and an exhaust hole 51 that is opened and closed by an opening / closing valve 4. A second sealing body 5 for sealing the other end of the pipe A, and a pressure increasing means 6 connected in the middle of the liquid supply pipe 2 for increasing the liquid pressure inside the pipe A filled with the liquid. Is equipped with.

The first sealing body 3 is provided with a sealing portion 32 for sealing one end of the pipe A on one side, and has a liquid supply inlet 31a on the upper surface thereof, and is vertically moved from the liquid supply inlet 31a. A long liquid inlet passage 33a and a liquid outlet passage 33b having a lower end of the liquid inlet passage 33a and a liquid outlet passage 33b penetrating the sealing portion 32. Liquid supply outlet 31b
And a cylindrical body 34 that is curved between the two, and the liquid supply inlet 31 a is connected to the liquid supply source 1 via the liquid supply pipe 2. The tubular body 34 is formed of an elbow, and one end of the elbow is attached to the outlet passage 33b by an attachment means such as press fitting so that the other end of the elbow, in other words, the liquid supply outlet 31b is located near the inner bottom of the pipe A. It is arranged to face the inner bottom a. The position near the inner bottom is a position which is about 1/4 or less of the inner diameter of the pipe A, but the inner bottom a depends on the inner diameter of the pipe A, the inner diameters of the liquid supply passage 33 and the cylinder 34, and the like. Set the position for. In addition, the 1st sealing body 3 comprises the liquid supply.

The second sealing body 5 is provided with a sealing portion 52 for sealing the other end of the pipe A on one side, and has an exhaust outlet 51a on the upper surface, and the exhaust outlet 51a is provided above and below the exhaust outlet 51a. The long outlet side passage 51b, the inlet side passage 51c penetrating the sealing portion 52 from the lower end of the outlet side passage 51b, and the exhaust inlet 51d included in the tubular body 53 fitted in the inlet side passage 51c. Exhaust hole 5
Have one. The exhaust hole 51 has an exhaust inlet 51d opened in the longitudinal direction of the pipe A at a position near the ceiling of the pipe A.

The pressure increasing means 6 comprises a single rod type fluid pressure cylinder 61 and a cylindrical liquid reservoir 63 in which the rod 62 of the fluid pressure cylinder 61 is inserted from one end and the inside is filled with liquid. The other end of the liquid reservoir 63 communicates with the middle of the liquid supply pipe 2 via the communication pipe 7, and the capacity of the liquid reservoir 63 is reduced by the advancing movement of the rod 62, The liquid pressure in the liquid container 63 and the liquid pressure in the pipe A communicating with the liquid storage device 63 are increased.

The pressure resistance test apparatus configured as described above is
It is used to test the pressure resistance of a circular tube A to which internal pressure is applied. FIG. 2 is a cross-sectional view showing a state where the tube is filled with the liquid. The withstand voltage test method by this withstand voltage test apparatus is performed in the following steps. (1) The sealing portion 32 of the first sealing body 3 is pressed against one end of the pipe A whose both ends are laterally placed to seal one end of the pipe A, and the second end is attached to the second end.
The sealing portion 52 of the sealing body 5 is pressed to seal the other end of the pipe A (see FIG. 1). (2) With the opening / closing valve 4 opening the exhaust hole 51, the opening / closing valve 10 is opened to supply the liquid from the liquid supply source 1 to the liquid supply part 31. In this case, since the liquid supply outlet 31b of the liquid supply unit 31 faces the inner bottom a at a position near the inner bottom of the pipe A, it is possible to eject the liquid from the liquid supply outlet 31b toward the inner bottom a of the pipe A. . As a result, it is possible to reduce the undulation of the liquid surface until the liquid supply outlet 31b is submerged, and it is possible to significantly reduce the entrainment of the residual air in the pipe A,
The residual air can be easily discharged from the exhaust hole 51 that opens near the ceiling of the pipe A, and moreover, the liquid supply outlet 31b can be submerged at a low liquid level without reducing the diameter of the liquid supply outlet 31b. After the liquid supply outlet 31b is submerged, the liquid supplied to the liquid supply unit 31 is supplied to the liquid supply outlet 31b.
From the liquid in the pipe A, in other words, it can be jetted toward the inner bottom a below the liquid surface. As a result, the residual air inside can be continuously supplied to the inside of the pipe A without being engulfed, and the liquid level can be rapidly increased. With the increase in the liquid level, the residual air is discharged from the exhaust hole 51. Is discharged to the outside,
The liquid can be quickly filled in the pipe A. (3) After filling the inside of the pipe A with the liquid, the exhaust hole 51 is closed by the open / close valve 4, and the rod 62 of the fluid pressure cylinder 61 is moved forward with the open / close valve 10 closed.
The hydraulic pressure inside the liquid reservoir 63 and the pipe A communicating with the liquid reservoir 63 is increased to the test pressure. Then, by maintaining this state for a predetermined time, it is determined whether the pipe A can withstand the test pressure,
For example, if there is liquid leakage, liquid bleeding, cracks, etc., the pipe A
Judge pass or fail. (4) After a lapse of a predetermined time, the pressure increase by the fluid pressure cylinder 61 is stopped, the opening / closing valve 4 opens the exhaust hole 51, and the hydraulic pressure in the pipe A is reduced. After this, the first sealing body 3 and the second sealing body 5
Remove from tube A and finish the test.

As described above, the pressure resistance test of the pipe A is performed from the liquid supply outlet 31b facing the inner bottom a of the pipe A to the inner bottom a of the pipe A.
Since the liquid is supplied toward the pipe, it is possible to reduce the undulation of the liquid surface until the liquid supply outlet 31b is submerged, and it is possible to reduce the entrainment of the residual air in the pipe A, and Exhaust hole 5 that opens at a position near the ceiling of A
It is easy to drain the liquid from No. 1, and the liquid supply outlet 31b can be submerged at a low liquid level. After the liquid supply outlet 31b is submerged, the liquid can be continuously supplied without entraining the residual air and the liquid can be filled inside the pipe A. It is possible to shorten the required filling time from the start of filling to the completion of filling as compared with the case of performing.

Embodiment 2 FIG. 3 is a schematic diagram showing the structure of Embodiment 2 of the tube pressure resistance test apparatus according to the present invention. In the pressure resistance test apparatus according to the second embodiment, instead of using the pressure increasing means 6 having the liquid reservoir 63 as in the first embodiment, the tube A is inserted into the tube A from one end,
A rod body 64 for reducing the liquid filling volume in the pipe A, and the rod body 6
A pressure booster 6a having a moving mechanism 65 for moving 4 is used, and further, the second sealing body 5 is opened at a position near the inner bottom of the pipe A and at a position near the ceiling of the pipe A. The exhaust holes 51 are provided so as to be separated from each other in the radial direction of the pipe A.

In the second embodiment, the moving mechanism 65
Is a one rod type fluid pressure cylinder, and the rod of the fluid pressure cylinder is the rod body 64. One end of the fluid pressure cylinder is attached to a first sealing body 3a that seals one end of the pipe A, and a through hole 35 that penetrates the sealing portion 32a is formed in the first sealing body 3a. The rod 64 is inserted into the through hole 35. Further, the through hole 35 is provided with a sealing ring 8 formed of an O-ring that contacts the peripheral surface of the rod body 64.

The liquid supply part 31 has a liquid supply inlet 31a on the lower surface of the second sealing body 5, and an inlet side passage 33a which is vertically long from the liquid supply inlet 31a, and the upper end of the inlet side passage 33a is used for the sealing. A tube having a liquid supply passage 33 formed of an outlet passage 33b penetrating the portion 32, and a liquid supply outlet 31b fitted in the liquid supply passage 33 and opened in the longitudinal direction of the pipe A at a position near the inner bottom of the pipe A. The liquid supply inlet 31 a is connected to the liquid supply source 1 via the liquid supply pipe 2 and the opening / closing valve 10. The position near the inner bottom is
The position is about 1/4 or less of the inner diameter of the pipe A, but the position with respect to the inner bottom a is set according to the inner diameter of the pipe A, the inner diameters of the liquid supply passage 33 and the cylinder 36, and the like.

The exhaust hole 51 has an exhaust outlet 51a on the upper surface of the second sealing body 5, and an outlet passage 51b vertically long from the exhaust outlet 51a, and the sealing portion 52 from the lower end of the outlet passage 51b. The exhaust outlet 5 includes an inlet side passage 51c penetrating therethrough and an exhaust inlet 51d included in a tubular body 53 fitted in the inlet side passage 51c.
The on-off valve 4 is connected to 1a.

In the second embodiment, the breakdown voltage test is performed in the steps (1) to (4) described in the first embodiment. Then, in the step (2), the liquid supply outlet 31b of the liquid supply portion is located near the inner bottom of the pipe A, and the liquid supply outlet 31b is connected to the pipe A through the liquid supply outlet 31b.
Since the liquid is jetted in the longitudinal direction of the pipe A at a position near the inner bottom of the pipe, the liquid surface will be wavy until the liquid supply outlet 31b is submerged, but the entrainment of residual air in the pipe A can be reduced. Therefore, the residual air can be easily discharged from the exhaust hole 51 opening near the ceiling of the pipe A, and the liquid supply outlet 31b can be submerged at a low liquid level. And the liquid supply outlet 3
After 1b is submerged, the liquid supplied to the liquid supply part 31 can be ejected from the liquid supply outlet 31b into the liquid in the pipe A. As a result, the residual air inside can be continuously supplied to the inside of the pipe A without being engulfed, and the liquid level can be quickly raised. As the liquid level rises, the residual air is discharged from the exhaust hole 51. The liquid is discharged to the outside and the inside of the pipe A can be quickly filled with the liquid.

Further, in the step (3), after filling the inside of the pipe A with the liquid, the exhaust hole 51 is closed by the opening / closing valve 4, and the rod body 64 of the moving mechanism 65 is moved forward with the opening / closing valve 10 closed. By doing so, the hydraulic pressure inside the pipe A is increased to the test pressure. Then, by maintaining this state for a predetermined time, it is determined whether or not the pipe A can withstand the test pressure. For example, the pass / fail of the pipe A is determined by the presence or absence of liquid leakage, liquid bleeding, cracks, and the like.

Since other configurations and operations are the same as those in the first embodiment, the same parts are designated by the same reference numerals,
The detailed explanation and the explanation of the action and effect are omitted.

In the first embodiment described above, the liquid supply passage 33 having the liquid supply inlet 31a is curved from the position communicating with the liquid supply passage 33 to the liquid supply outlet 31b. Although the liquid supply part 31 including the cylindrical body 34 is provided, the liquid supply part 31 does not include the cylindrical body 34, and a portion corresponding to the cylindrical body 34 is integrally formed with the sealing portion 32. Alternatively, a tubular portion that is long in the longitudinal direction of the pipe A may be provided in the sealing portion 32, and one tubular portion may be provided on one side in the radial direction or a plurality of feeding portions may be spaced apart in the longitudinal direction. The liquid outlet 31b may be provided, and the structure of the liquid supply unit 31 is not particularly limited.

[0038]

As described above in detail, according to the first invention and the fourth invention, since the liquid is discharged from one end of the pipe to the position near the inner bottom of the pipe from the liquid supply outlet located at the position near the inner bottom of the pipe, Although the liquid surface will be wavy until the liquid supply outlet is submerged, it is possible to reduce the entrapment of residual air in the pipe, to easily discharge the residual air from the exhaust hole, and to supply liquid at a low liquid level. The outlet can be submerged, and after this submersion, continuous liquid supply can be performed without involving residual air. The required filling time can be shortened.

According to the second invention and the fifth invention, since the liquid is supplied from the liquid supply outlet facing the inner bottom of the pipe toward the inner bottom of the pipe, the liquid surface is corrugated until the liquid supply outlet is submerged. It is possible to reduce the amount of entrainment of residual air in the pipe, to easily discharge the residual air from the exhaust hole, and to submerge the liquid supply outlet without reducing the diameter of the liquid supply outlet. After this submersion, it is possible to continuously supply liquid without entraining residual air, shortening the required filling time from the start of filling to the completion of filling compared to the case where filling is repeated by supplying and stopping the liquid. can do.

According to the third aspect of the invention, since the pipe for performing the pressure resistance test also serves as the liquid reservoir of the pressure increasing means, the pressure resistance test can be performed without using the liquid reservoir.

According to the sixth aspect of the invention, the liquid supply outlet facing the inner peripheral surface of the pipe can be obtained by attaching the cylindrical body,
The cost of the withstand voltage test device can be reduced.

According to the seventh aspect of the invention, since the pipe for performing the pressure resistance test also serves as the reservoir of the pressure boosting means, the structure of the pressure resistance testing device can be simplified as compared with the case of using the pressure boosting means having the reservoir. The cost can be reduced.

According to the eighth aspect of the present invention, since the through hole for the rod body can be provided in the first sealing body or the second sealing body regardless of the liquid supply portion and the exhaust hole, it corresponds to the pipe. A thick rod can be used, and the pressure can be increased without increasing the amount of movement of the rod.

[Brief description of drawings]

FIG. 1 is a first embodiment of a tube pressure resistance test apparatus according to the present invention.
It is a schematic diagram which shows the structure of.

FIG. 2 is a schematic diagram showing a state in which a pipe is filled with a liquid by the pressure resistance testing device for a pipe according to the present invention.

FIG. 3 is a second embodiment of the tube pressure resistance test apparatus according to the present invention.
It is a schematic diagram which shows the structure of.

FIG. 4 is a schematic diagram showing a configuration of a conventional withstand voltage test apparatus.

FIG. 5 is a schematic view showing a step in the middle of a conventional withstand voltage test method.

[Explanation of symbols]

A pipe 3,3a First sealed body 31 Liquid Supply Department 31b Liquid supply outlet 4 Opening / closing means (open / close valve) 5 Second sealed body 51 Exhaust hole 6 Pressure increasing means 6a Pressure booster 64 bars 65 moving mechanism

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Claims (8)

[Claims] 1. A method for testing the pressure resistance of a pipe by filling the interior of a pipe, the ends of which are horizontally placed, with a liquid supply having a liquid supply outlet from one end of the pipe to a position near the inner bottom of the pipe. Supply the liquid to the inside of the pipe by using the step of increasing the liquid level without entraining the residual air in the pipe after the liquid supply outlet is submerged, and the liquid pressure in the pipe filled with the liquid by increasing the liquid level. And a pressure increasing test method for a pipe. 2. A method for testing the pressure resistance of a pipe by filling the inside of a pipe whose both ends are placed horizontally with a liquid supply liquid having a liquid supply outlet facing the inner bottom of the pipe from one end of the pipe. To supply the liquid to the inside of the pipe and increase the liquid level without entraining the residual air in the pipe after the liquid supply outlet is submerged, and to increase the liquid level to increase the liquid pressure in the pipe filled with the liquid. A pressure resistance test method for a pipe, comprising a step of increasing pressure. 3. The step of increasing the liquid pressure in the pipe includes a rod body that is inserted into the pipe from one end or the other end of the pipe to reduce the liquid filling volume in the pipe, and a moving mechanism that moves the rod body. The pressure resistance test method for a pipe according to claim 1, wherein a pressure booster provided therein is used. 4. A first sealing body which has a liquid supply part and seals one end of the pipe, a second sealing body which seals the other end of the pipe, and the first sealing body which is opened and closed by an opening / closing means. In a pipe pressure resistance test apparatus comprising an exhaust hole provided in a stopper and / or a second sealing body, and a pressure increasing means for increasing the liquid pressure in the liquid-filled pipe, the liquid supply section is A pressure resistance testing device for a pipe, characterized in that when the first sealing body seals one end of the pipe, it has a liquid supply outlet opening at one position in the circumferential direction at a position near the inner peripheral surface of the pipe. 5. A first sealing body having a liquid supply part for sealing one end of the tube, a second sealing body for sealing the other end of the tube, and the first sealing body opened and closed by an opening / closing means. In a pipe pressure resistance test apparatus comprising an exhaust hole provided in a stopper and / or a second sealing body, and a pressure increasing means for increasing the liquid pressure in the liquid-filled pipe, the liquid supply section is A pressure resistance test apparatus for a pipe, characterized in that it has a liquid supply outlet facing the inner peripheral surface of the pipe at one position in the circumferential direction of the pipe when the first sealing body seals one end of the pipe. 6. The liquid supply part includes a liquid supply passage having a liquid supply inlet, and a cylindrical body which communicates with the liquid supply passage and is curved from a position communicating with the liquid supply passage to the liquid supply outlet. Item 5. A pressure resistance test apparatus for a pipe according to item 5. 7. The pressure increasing means has a rod body that penetrates the first sealing body or the second sealing body and is inserted into the pipe, and a moving mechanism that moves the rod body. 4. The tube pressure resistance test apparatus according to any one of 4 to 6. 8. The pressure resistance test apparatus for a pipe according to claim 7, wherein the liquid supply portion and the exhaust hole are provided in the first sealing body or the second sealing body through which the rod does not penetrate.