KR101019191B1 - Pressure test apparatus and method for corrugated membrane - Google Patents

Abstract

The apparatus for testing the pressure resistance of a membrane according to an embodiment of the present invention includes a tunnel housing having a base on which a membrane can be placed, a receiving space accommodating a bend to cover the bend, and an inner surface and a bend of the tunnel housing. A pressure bag disposed in the receiving space to be disposed between the outer surface, and a fluid compressor for supplying fluid to the pressure bag. The pressure bag has a chamber for accommodating the fluid and an inlet connected to the chamber for injecting the fluid, and a deformable body whose shape can be modified according to the pressure change inside the chamber. When the fluid compressor supplies fluid to the chamber through the inlet, the variable body may expand and pressurize the bend. The apparatus for testing the pressure resistance of a membrane according to the present invention can easily test and evaluate the pressure resistance characteristics of a membrane having a bend by using simple fixtures and equipment such as a tunnel-type housing, a pressure bag, and a fluid compressor.

Description

PRESSURE TEST APPARATUS AND METHOD FOR CORRUGATED MEMBRANE}

The present invention relates to a pressure resistance test apparatus for a membrane having a bent portion of the present invention, and more particularly, to a pressure resistance test apparatus and a pressure resistance of a membrane having a bent portion, which can be easily understood by using a jig and a fluid pressure device having a simple structure. It relates to the test method.

Membrane having a corrugation is used in various fields requiring thermal shock absorption due to structural strength and temperature change, such as the inner wall of a storage tank for storing cryogenic fluids such as LNG. In the case of a storage tank for liquefied natural gas storage, when the cryogenic fluid comes into contact with the metal membrane, the bent portion is stretched to the side, thereby reducing local stress generated in the weld portion of the membrane. The higher the height of the bend, the less stress is generated in the weld when the membrane heat shrinks, but the pressure limit can be lowered. Therefore, the design of the membrane must be accompanied by an evaluation of the pressure resistance characteristics of the bend.

As a method for evaluating the pressure resistance characteristics of the membrane bent portion, there is a method using a finite element analysis tool. This method predicts the deformation behavior of the membrane against pressure through finite element analysis.

Another method for evaluating the pressure resistance characteristics of the membrane bend is to evaluate the pressure resistance characteristic of the membrane bend by using a pressurized fluid. In order to understand the pressure resistance characteristics of the membrane, first, a portion of the membrane is cut and placed inside the fluid chamber, and the jig bottom and bottom are completely welded and sealed to generate a pressure difference between the upper and lower parts. And the pressure resistance of the membrane can be evaluated by filling the upper with the fluid and pressurized using a pump.

However, the conventional method of evaluating the pressure resistance characteristics of a membrane bend using a finite element analysis tool has a problem that does not involve experimental verification.

In addition, the method of evaluating the pressure resistance characteristics of the membrane by placing a portion of the membrane inside the fluid chamber and applying a pressure is very cumbersome and requires a long time, such as cutting a portion of the membrane and welding the bottom of the jig. There is a problem that costs are large.

The present invention is to solve the problems of the conventional membrane pressure test method as described above, using a simple jig and equipment with a pressure resistance test apparatus and a pressure test method of the membrane having a bent portion that can easily grasp the pressure resistance characteristics of the membrane. The purpose is to provide.

An apparatus for testing the pressure resistance of a membrane according to an embodiment of the present invention for achieving the above object includes a tunnel-type housing having a base on which a membrane can be placed, and a receiving space accommodating the bend to cover the bend; And a pressure bag disposed in the accommodation space to be disposed between an inner surface of the tunnel-shaped housing and an outer surface of the bent portion, and a fluid compressor for supplying fluid to the pressure bag. The pressure bag has a chamber for accommodating a fluid and an inlet connected to the chamber for fluid injection, and a deformable body whose shape can be changed according to a pressure change in the chamber. The fluid compressor may pressurize the bent portion by expanding the variable body by supplying a fluid to the chamber through the injection port.

The apparatus for testing the internal pressure of the membrane according to the embodiment of the present invention may further include a pressure gauge for measuring the pressure in the chamber.

The apparatus for testing a pressure resistance of a membrane according to an embodiment of the present invention may further include a deformation amount measuring device for measuring a deformation amount of the bent portion.

The tunnel housing may be formed with a coupling hole connected to the injection hole, the pressure resistance test apparatus of the membrane according to an embodiment of the present invention, once through the coupling hole to connect the injection hole and the fluid compressor Silver is coupled to the inlet and the other end may further include an injection tube protruding out of the tunnel-type housing.

The apparatus for testing the pressure resistance of a membrane according to an embodiment of the present invention may further include fixing means for fixing the tunnel housing to the base while covering the bent portion.

The apparatus for testing the pressure resistance of a membrane according to an embodiment of the present invention may further include a lubricating material laminated on the surface of the pressure bag in contact with the outer surface of the bend to reduce friction between the outer surface of the bend and the surface of the pressure bag. have.

At least one of both ends of the tunnel-shaped housing may be formed with an opening through which the bent portion can pass, the pressure resistance test apparatus of the membrane according to an embodiment of the present invention, a portion of the compression bag through the opening The cover member may further include a cover member coupled to an end at which the opening of the tunnel housing is formed so as not to escape to the outside of the tunnel housing and having a groove corresponding to the bent portion.

Here, the cover member may have a protrusion protruding toward the accommodation space to press the edge of the compression bag into the interior of the accommodation space.

In addition, the chamber may be asymmetrically disposed to one side in the interior of the variable body so that the compression bag can press only a portion of the outer surface of the bent portion.

In addition, the chamber is divided into a first partial chamber and a second partial chamber are formed separately from each other in the interior of the variable body, so that the compression bag can simultaneously press the outer surface of the bent portion at different pressures, The injection port may be divided into a first inlet connected to the first partial chamber and a second inlet connected to the second partial chamber.

The apparatus for testing a pressure resistance of a membrane according to an embodiment of the present invention may further include a pressing member disposed inside the curved portion to pressurize the inner surface of the curved portion in an outward direction to resist the pressing force of the pressure bag.

Here, the pressing member may be made of an elastic material that can expand when fluid is introduced therein so as to change the internal pressure of the bent portion.

The apparatus for testing a pressure resistance of a membrane according to an embodiment of the present invention may further include a reinforcing member disposed inside the bent part to support the bent part so as to reinforce the structural strength of the bent part.

The apparatus for testing a pressure resistance of a membrane according to an embodiment of the present invention may further include a support panel disposed on the base to support at least a portion of the membrane including a peripheral portion of the bent portion.

According to an embodiment of the present invention, a method of testing a pressure resistance of a membrane having a bent portion includes: a) placing the membrane on a base; and b) a tunnel having a receiving space for accommodating the bent portion. Disposing a pressure bag having a variable body covering the bent portion with a cylindrical housing, the volume of which is expandable between the bent portion and the tunnel-shaped housing by fluid injection; and c) placing the tunnel-shaped housing on the membrane. Squeezing and d) pressurizing the bent portion by inflating the pressure tube by supplying a fluid to the pressure bag.

Here, step c) may fix the tunnel-type housing to the base by using a fixing means.

In the method of testing the internal pressure of the membrane according to an embodiment of the present invention, before the step d), the pressure member may be disposed inside the bent portion to pressurize the inner surface of the bent portion in an outward direction to resist the pressing force of the pressure bag. The method may further include varying an internal pressure of the curved portion by supplying and expanding the pressurizing member.

The internal pressure test method of the membrane according to an embodiment of the present invention further includes the step of disposing a reinforcing member supporting the bent portion inside the bent portion to reinforce the structural strength of the bent portion before the step d). can do.

The method of testing the pressure resistance of a membrane according to an embodiment of the present invention further includes, before the step (a), disposing a support panel on the base, which may affect the pressure resistance characteristics of the membrane, and (a) The step may place the membrane on the base such that at least a portion of the membrane comprising the periphery of the bend is placed on the support panel.

The internal pressure test method of the membrane according to an embodiment of the present invention may further include measuring the deformation amount of the bent portion by using the deformation amount measuring device after step d).

The apparatus for testing the pressure resistance of a membrane according to the present invention can easily test and evaluate the pressure resistance characteristics of a membrane having a bend by using simple fixtures and equipment such as a tunnel-type housing, a pressure bag, and a fluid compressor.

In addition, the apparatus for testing the internal pressure of the membrane according to the present invention can evaluate the structural strength of the membrane against dynamic pressure as well as static pressure by adjusting the pressure and velocity of the fluid injected into the pressure bag.

In addition, the apparatus for testing the pressure resistance of a membrane according to the present invention can evaluate the pressure resistance characteristics of a curved portion under various conditions such as when an asymmetrical pressure is applied to the curved portion or when the internal pressure of the curved portion is greater than or equal to atmospheric pressure.

Hereinafter, a pressure resistance test apparatus and a pressure test method of a membrane according to various embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings, the size and shape of the components, etc. may be exaggerated or simplified to aid in understanding the invention.

According to various embodiments of the present disclosure, an apparatus for testing a pressure resistance of a membrane and a method for testing a pressure resistance of the membrane easily pressurizes the bending portion 11 of the membrane 10 and then measures the deformation amount of the bending portion 11 to facilitate the pressure resistance characteristics of the bending portion 11. I can figure it out. As a means for applying pressure to the outer surface of the bent portion 11, a flexible pressure bag 23 that can be expanded by fluid injection is used.

As shown in Figure 1 and 2, the pressure resistance test apparatus 20 of the membrane according to an embodiment of the present invention, the base 21, the bent portion on which the membrane 10 having the bent portion 11 can be placed Fluid is supplied to the tunnel housing 22 in which the receiving space 38 is formed to cover 11, the pressure bag 23 having the variable body 47 capable of contraction and expansion, and the pressure bag 23. It includes a fluid compressor 24 for the purpose of.

The base 21 is composed of a base panel 31 and spacers 32 stacked on the base panel 31. The spacer 32 forms a space for accommodating the support panel 25, which will be described later, and may be omitted in some cases. Each of the base panel 31 and the spacer 32 is provided with a plurality of through holes 33 and 34 through which a plurality of bolts 44 to be described later penetrate.

An accommodating groove 35 is formed in the spacer 32, and a supporting panel 25 made of a material different from that of the base 21 is accommodated in the accommodating groove 35. When the membrane 10 rests on the spacer 32, at least a portion of the membrane 10, including the periphery of the bend 11, is positioned over the support panel 25 such that the support panel 25 is supported by the membrane 10. The effect on the pressure resistance characteristics of the

For example, in the pressure resistance test of the membrane 10 used as the primary barrier of the LNG storage tank, a plywood supporting the primary barrier may be used as the support panel 25. When the pressure is applied to the membrane 10 used as the primary barrier in the state where the plywood is placed underneath, it is possible to examine how the plywood affects the pressure resistance characteristics of the membrane 10 and stores the liquefied natural gas. It is possible to simulate the situation where the primary barrier of the LNG storage tank is pressurized by the LNG. In the present invention, the spacer 32 can be omitted, in which case the membrane 10 is placed on the base panel 31.

The tunnel-shaped housing 22 serves to keep the pressure bag 23 in close contact with the bent portion 11 when the pressure bag 23 is supplied with the fluid and expands therein. Tunnel-type housing 22 has a length that can cover at least a portion of the bent portion 11, the pressure bag 23 is made of a material with a high rigidity such as metal that does not deform when expanded and pressurizes it. Openings 37 through which the bent portion 11 can pass are formed at both ends of the tunnel-shaped housing 22, respectively. The opening 37 is preferably formed in a shape corresponding to the bent portion 11. Although the tunnel-shaped housing 22 is illustrated as being formed in a rectangular box shape in the drawing, the tunnel-type housing 22 is not limited to the rectangular box shape, and various pressure-adhesive bags 23 may be in close contact with the bent portion 11. It can be made in shape.

As shown in FIG. 2, an accommodation space 38 capable of accommodating the bent portion 11 is formed in the tunnel-shaped housing 22. The accommodation space 38 is disposed at the center of the tunnel-type housing 22 in a size that can accommodate the bent portion 11 and the pressure bag 23. The size of the accommodation space 38 is preferably such that the gap between the inner surface of the tunnel-shaped housing 22 and the outer surface of the curved portion 11 is as small as possible under the condition of accommodating the curved portion 11 and the pressure bag 23. . If the distance between the inner surface of the tunnel-shaped housing 22 and the outer surface of the bend 11 is small, it is possible to apply sufficient pressure to the bend 11 with a small amount of fluid. A coupling hole 39 connected to the accommodation space 38 is formed in the center of the tunnel housing 22. This coupling hole 39 is for coupling an injection tube 54 for injecting fluid into the pressure bag 23. The position of the accommodation space 38 and the coupling hole 39 is not limited to the center of the tunnel-shaped housing 22 can be variously changed.

The tunnel housing 22 is fixed to the base 21 by fastening means 43 having a plurality of bolts 44 and nuts 45. A plurality of through holes 41 are formed at both sides of the tunnel housing 22 so that the plurality of bolts 44 can pass therethrough. The bolt 44 is sequentially penetrated through the through holes 33 and 34 of the base 21, the through hole 13 of the membrane 10, and the through hole 41 of the tunnel-shaped housing 22, and then the bolt ( The tunnel-shaped housing 22 can be fixed to the base 21 by screwing the nut 45 to the end of 44.

In the present invention, as the fixing means 43, in addition to the bolt 44 and the nut 45 as shown, other mechanisms capable of fixing the tunnel-like housing 22 to the base 21, such as a clamp mechanism, may be used. Can be. In addition, the fixing means 43 may be omitted. In this case, when the fluid is injected into the pressure bag 23, by pressing the tunnel-type housing 22 toward the base 21, an even pressing force may be applied to the outer surface of the bent portion 11. When the fixing means 43 are omitted, pressing means such as a hydraulic device may be used to press the tunnel-type housing 22.

As shown in FIG. 2, the pressure bag 23 is accommodated in the receiving space 38 of the tunnel-shaped housing 22, and an upper surface thereof may be attached to the inner surface around the receiving space 38, or separated. It may be. The pressure bag 23 has a variable body 47 that expands when the internal pressure rises and contracts to its original state when the internal pressure decreases. The variable body 47 is sized to cover the bent portion 11 and the portion around the bent portion 11 of the membrane 10, and the chamber 48 and the inlet connected to the chamber 48 to accommodate the fluid ( 49).

The variable body 47 is a flexible material that can expand more than its original volume, such as urethane rubber, silicone rubber, rubber materials such as natural rubber for tires, and rubber synthetic materials that include reinforcing materials in rubber. It can be made of a flexible material that can shrink and expand according to the change in the internal pressure. The variable body 47 is closed except for the inlet 49, so that when the compressed fluid is introduced into the chamber 48, the variable body 47 may press the curved portion 11 while expanding firmly.

The reinforcement part 51 is provided in the center of the variable body 47 in which the injection hole 49 is formed. The reinforcement part 51 reinforces the thickness of the part in which the injection hole 49 of the variable body 47 is formed. A fixing groove 52 is formed in the reinforcing portion 51, and a fixing portion 55 provided at the end of the injection tube 54 is inserted into the fixing groove 52. The fixing part 55 is formed in the shape of a disk having a centrally bent portion, and the fixing groove 52 has a disk shape corresponding to the shape of the fixing part 55. Since the fixing part 55 of the injection tube 54 is inserted into the fixing groove 52, the injection tube 54 is not easily separated from the pressure bag 23. In the present invention, the coupling structure of the injection tube 54 and the pressure bag 23 is not limited to that shown and described, and the injection tube 54 may be coupled to prevent the fluid leakage from the pressure bag 23. It may be changed to another structure.

An example is a bag in which two elastic rectangular members are sealed with the pressure bag 23. This type of bag has four corners sealed and a chamber is formed between the two rectangular members to accommodate the fluid without leakage. In addition, an injection hole is formed at the center of the rectangular member positioned at the upper side of the two rectangular members, and the center of the rectangular member positioned at the lower portion includes a curved surface corresponding to the top portion 14 of the curved portion 11. Since a portion of the bag is formed of a curved surface, the bag may be closely attached to the bent portion 11 without a gap. In addition to the form of such a stretchable bag, the pressure bag 23 may be formed in various forms capable of expanding the pressurizing portion 11 when the fluid bag 23 is received in the receiving space 38 and supplied with fluid.

The fluid compressor 24 compresses the fluid and supplies the compressed fluid to the pressure bag 23. The fluid compressor 24 is coupled to a fluid supply tube 57 which can be detachably coupled to the injection tube 54. The compressed fluid generated in the fluid compressor 24 is supplied to the pressure bag 23 through the fluid supply pipe 57 and the injection pipe 54 to inflate the pressure bag 23. Compressed fluids that can be used to inflate the pressure bag 23 can be air or other gases, or water or other liquids. The pressure gauge 58 is provided in the fluid supply pipe 57, and the internal pressure of the pressure bag 23 can be measured. A pressure gauge 58 for measuring the pressure of the fluid supplied to the pressure bag 23 may be installed in the injection tube 54.

As shown in FIG. 2, a strain gauge 59 is provided on the inner surface of the bent portion 11. The strain gauge 59 is for measuring the amount of deformation of the bent portion 11 when the bent portion 11 pressurized by the pressure bag 23 is deformed. The strain gauge 59 outputs the measured value to an output device not shown, and the user can check the deformation amount of the bent part 11 through the output device. In the present invention, the strain gauge 59 may be changed to another type of displacement measuring device installed in contact or non-contact on the inner surface of the bent portion (11). When a digital pressure gauge is mounted between the injection pipe 54 and the fluid supply pipe 57 and collected at the same time as the strain gauge 59 signal, the deformation behavior of the membrane 10 according to the pressure applied to the bend 11 can be data-formed. Can be.

Hereinafter, a process of inspecting the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to an embodiment of the present invention will be described.

First, as shown in FIGS. 1 and 2, the membrane 10 having the bent part 11 is placed on the base 21, and the flat part around the bent part 11 and the bent part 11 of the membrane 10. (12) A part is covered with the tunnel housing 22. The membrane 10 to be tested may be various membranes made of metals or materials other than metals. In the process of covering the bend 11 with the tunnel-type housing 22, the pressure bag 23 is first coupled to the receiving space 38 of the tunnel-type housing 22, and then the bend 11 with the tunnel-type housing 22. It may cover, or may first cover the bent portion 11 with a pressure bag 23, and then cover the pressure bag 23 with a tunnel-type housing (22). Thus, the tunnel-shaped housing 22 is fixed to the base 21 using the fixing means 43 in the state in which the bent part 11 is covered with the tunnel-type housing 22 so that the pressure bag 23 is disposed on the bent part 11. do.

Thereafter, the fluid supply pipe 57 is coupled to the injection pipe 54 and the compressed fluid of the fluid compressor 24 is injected into the pressure bag 23. When the fluid is injected into the pressure bag 23, the pressure bag 23 expands while the internal pressure of the pressure bag 23 rises. The inflating pressure bag 23 presses the bent portion 11 while filling the space between the inner surface of the tunnel-shaped housing 22 and the outer surface of the bent portion 11, whereby an even pressure is applied to the entire outer surface of the bent portion 11. Is approved. When the bent portion 11 is deformed under pressure from the pressure bag 23, the strain gauge 59 can determine the breakdown voltage characteristic of the membrane 10 by measuring the deformation amount of the bent portion 11.

In the internal pressure test of the membrane, by adjusting the internal pressure of the pressure bag 23 by changing the pressure or injection amount of the compressed fluid, it is possible to determine the internal pressure characteristics of the membrane 10 under various pressure conditions.

Figure 3 shows a method for examining the pressure resistance characteristics of the membrane by using a pressure resistance test apparatus according to another embodiment of the present invention. In the pressure resistant test apparatus according to another embodiment of the present invention, most of the configuration is the same as the pressure resistant test apparatus 20 shown in FIG. 2, except that the outer surface of the bent portion 11 and the surface of the pressure bag 23 facing the same. There is a difference in that the lubricating material 61 for reducing friction is interposed therebetween. The lubricating material 61 may be interposed between the bent part 11 and the pressure bag 23 when the pressure bag 23 covers the bent part 11 while being stacked on the surface of the pressure bag 23.

The lubricating material 61 reduces the friction between the bend 11 and the pressure bag 23, so that the shear stress is generated on the outer surface of the bend 11 when the pressure bag 23 expands by fluid injection. It can prevent. As the lubricating material 61, a liquid lubricant or a solid lubricant film may be used.

4 and 5 are a side cross-sectional view and a front view showing the main configuration of the pressure resistance test apparatus of the membrane according to another embodiment of the present invention. In the pressure resistance test apparatus shown in FIG. 4, most of the configuration is the same as that of the pressure resistance test apparatus 20 shown in FIG. 2, except that the cover member 63 is coupled to each of both ends of the tunnel-type housing 22. There is a difference. The cover member 63 is coupled to each of both ends of the tunnel-shaped housing 22, so that a part of the pressure bag 23 passes through the opening 37 of the tunnel-type housing 22 to the outside of the tunnel-type housing 22. Prevents escape

When the pressure bag 23 interposed between the inner surface of the tunnel-shaped housing 22 and the outer surface of the bend 11 expands, a portion of the pressure bag 23 can escape through the opening 37. In this case, the pressure limit of the pressure bag 23 is reduced, and a problem arises in that the fluid supply amount must be increased to evenly press the outer surface of the bent portion 11. This problem can be solved by covering the opening 37 with the cover member 63 to close the gap between the bend 11 and the tunnel-shaped housing 22.

The cover member 63 is fixed to the end of the tunnel-shaped housing 22 by fastening means such as a bolt 64. As shown in FIGS. 4 and 5, the cover member 63 has a through hole 65 for engaging the bolt 64, and the bolt 64 is screwed at the end of the tunnel-shaped housing 22. A screw hole 66 that can be engaged is formed. In addition to the bolt 64, various mechanisms for detachably coupling the cover member 63 to the tunnel-type housing 22 may be used as the fastening means.

The cover member 63 is sized to cover the opening 37 and does not need to be equal to or larger than the end width of the tunnel-shaped housing 22. In addition, the cover member 63 has a groove 67 corresponding to the bent portion 11 and a protrusion 68 for pressing the edge of the pressure bag 23 into the interior of the receiving space 38. As shown in FIG. 4, the protrusion 68 protrudes toward the receiving space 38 on the rear surface of the cover member 63 so that the cover member 63 is coupled to the end of the tunnel-shaped housing 22. Compress the edge of the pressure bag (23). In this way, the protrusion 68 compresses the edge of the pressure bag 23 to the inner surface of the tunnel-shaped housing 22, so that the edge where stress concentration occurs may be reinforced. In the case of the compression bag in which the seal is formed at the corner, the protrusion 68 prevents the edge seal of the pressure bag 23 from being damaged at high pressure, thereby contributing to improved reliability of the experimental apparatus.

Figure 6 shows a method for examining the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention. Most of the pressure resistance test apparatus shown in FIG. 6 is the same as the pressure resistance test apparatus 20 shown in FIG. 2, but there is a difference in the shape of the pressure bag 71. In the pressure bag 71 of the internal pressure test apparatus according to the present embodiment, the chamber 73 is asymmetrically disposed to one side inside the variable body 72 so as to press only a portion of the outer surface of the bent portion 11. .

Accordingly, the right side of the bent portion 11 may be in close contact with the pressure bag 71 based on the top portion 14 of the bent portion 11, and the left side of the bent portion 11 may be separated from the pressure bag 71. No pressure A space 74 is formed between the right side of the bent portion 11 and the pressure bag 71. When the pressure bag 71 expands, the bent portion 11 may be deformed in the lateral direction. In the internal pressure test apparatus according to the present embodiment, it is possible to simulate the case where the pressure acts only on a part of the bent portion 11. In the present embodiment, the position of the chamber 73 is not limited to that shown, and may be changed to various positions inside the variable body 72 under conditions that apply pressure to only a part of the bent portion 11.

Figure 7 shows a method for examining the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention. The pressure test apparatus shown in FIG. 7 is the same as most of the pressure test apparatus 20 shown in FIG. 2, and the pressure bag 76 and the tunnel-type housing 22 are structurally modified. The pressure bag 76 of the internal pressure test apparatus according to the present embodiment includes a first partial chamber 78a and a second partial chamber in which chambers 78 formed in the variable body 77 are separated from each other to receive fluid. The injection port 79 for fluid injection is divided into a first inlet 79a connected to the first partial chamber 78a and a second inlet 79b connected to the second partial chamber 78b. have.

A first injection tube 81 and a second injection tube 82 are coupled to each of the first and second inlets 79a and 79b. The first injection tube 81 extends outside of the tunnel-type housing 22 through the first coupling hole 83 formed in the tunnel-type housing 22, and the second injection tube 82 is tunnel-type. It extends to the outside of the tunnel-shaped housing 22 through the second engagement hole 84 formed in the housing 22. Although not shown, each of the first and second injection pipes 81 and 82 is connected to one fluid compressor capable of supplying fluids of different pressures or two fluid compressors capable of supplying fluids of different pressures. .

In the internal pressure test apparatus according to the present exemplary embodiment having such a configuration, pressures of different pressures are respectively supplied to each of the first and second partial chambers 78a and 78b, thereby partially compressing the outer surface of the bent portion 11. Can be pressurized at the same time. Therefore, it is possible to simulate the case where the membrane bend 11 is subjected to an asymmetrical pressure.

Figure 8 shows a method for examining the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention. The internal pressure test apparatus shown in FIG. 8 is the same as most of the pressure test apparatus 20 shown in FIG. 2, except that the pressure member capable of pressing the inner surface of the curved portion 11 inside the curved portion 11 ( The difference is that 86 are installed more. When the pressure bag 23 is inflated by pressing the inner surface of the bent portion 11 in the outward direction with the pressing member 86, the effect of the internal pressure of the bent portion 11 on the pressure resistance characteristics of the bent portion 11 can be seen. .

The pressure member 86 may be made of a stretchable material capable of contracting and expanding according to a change in internal pressure and expanding when the fluid is supplied to press the inner surface of the bent portion 11. When the pressing member 86 is made of an elastic material, the pressure conditions inside the bent part 11 may be variously changed by adjusting the pressure of the compressed fluid supplied to the pressing member 86. In addition to the elastic material, the pressing member 86 may be made of a material that structurally supports the inner surface of the bent part 11 due to rigidity such as metal, plastic, and rubber.

Here, instead of the pressing member 86, it is also possible to arrange a reinforcing member that can reinforce the bent portion 11 inside the bent portion (11). When the internal pressure test is performed with the structural strength of the bent portion 11 reinforced by the reinforcing member, the structural strength change of the membrane curved portion 11 according to the reinforcing member and the structural strength of the reinforcing member used at this time may be evaluated.

As described above, the pressure resistance test apparatus of the membrane according to the present invention uses the simple jig and equipment such as a tunnel-type housing, a pressure bag, a fluid compressor, and the like to test the pressure resistance characteristics of the membrane 10 having the bent portion 11. You can simply check it. In addition, by adjusting the pressure and speed of the fluid injected into the pressure bag, it is possible to evaluate the structural strength of the bent portion 11 with respect to the dynamic pressure as well as the static pressure. In addition, when the asymmetrical pressure is applied to the bent portion 11 or the internal pressure of the bent portion 11 or more can be simulated experiments in which the bent portion 11 receives the pressure under various conditions.

The present invention described above is not limited to the configuration and operation as shown and described. That is, the present invention is capable of various changes and modifications within the spirit and scope of the appended claims.

1 is a perspective view schematically showing a pressure resistance test apparatus of a membrane according to an embodiment of the present invention.

2 is a cross-sectional view showing a method of testing the pressure resistance characteristics of the membrane using the pressure resistance test apparatus of the membrane shown in FIG.

3 is a cross-sectional view showing a method of inspecting the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention.

4 and 5 are a side cross-sectional view and a front view showing the main configuration of the pressure resistance test apparatus of the membrane according to another embodiment of the present invention.

Figure 6 is a cross-sectional view showing a method for examining the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention.

7 is a cross-sectional view showing a method of inspecting the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention.

8 is a cross-sectional view showing a method of inspecting the pressure resistance characteristics of the membrane by using the pressure resistance test apparatus of the membrane according to another embodiment of the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

10 membrane 11 bend

20: pressure resistance test apparatus 21: base

22 tunnel housing 23, 71, 76 pressure bag

24 fluid compressor 25 support panel

43: fixing means 47, 72, 77: variable body

48, 73, 78: chamber 54: injection tube

58: pressure gauge 59: strain gauge

61: lubricant 63: cover member

68: protrusion 81, 82: first, second injection tube

86: pressure member

Claims (20)

In the pressure resistance test apparatus of the membrane for inspecting the pressure resistance characteristics of the membrane having a bend, A base on which the membrane can be placed; A tunnel housing having an accommodation space for accommodating the bent portion to cover the bent portion; It is disposed in the receiving space so as to be disposed between the inner surface of the tunnel-shaped housing and the outer surface of the bent portion, a chamber for accommodating the fluid and an injection port connected to the chamber for the fluid injection is formed and according to the pressure change in the chamber A pressure bag having a variable body whose shape can be deformed; And a fluid compressor for supplying a fluid to the chamber through the injection hole so as to expand the pressure bag to pressurize the bent portion. The method of claim 1, Pressure testing apparatus further comprises a pressure gauge for measuring the pressure in the chamber. The method of claim 1, Pressure resistance test apparatus further comprises a deformation amount measuring device for measuring the amount of deformation of the bent portion. The method of claim 1, The tunnel-shaped housing is formed with a coupling hole connected to the inlet, The pressure test apparatus, characterized in that the inlet through the coupling hole so as to connect the inlet and the fluid compressor, one end is coupled to the inlet and the other end protrudes out of the tunnel-type housing. The method of claim 1, And a fixing means for fixing the tunnel-shaped housing to the base while covering the bent portion. The method of claim 1, And a lubricating material laminated on the surface of the pressure bag in contact with the outer surface of the bent portion to reduce friction between the outer surface of the bent portion and the surface of the pressure bag. The method of claim 1, At least one of both ends of the tunnel-shaped housing is formed with an opening through which the bent portion can pass, And a cover member coupled to an end at which the opening of the tunnel-shaped housing is formed so that a portion of the compression bag does not escape through the opening to the outside of the tunnel-type housing, and having a groove corresponding to the bent portion. Pressure test device. The method of claim 7, wherein The cover member is a pressure resistance test apparatus characterized in that it has a protrusion projecting toward the accommodation space to press the edge of the compression bag into the interior of the accommodation space. The method of claim 1, And the chamber is asymmetrically disposed to one side in the interior of the variable body so that the compression bag can press only a portion of the outer surface of the bent portion. The method of claim 1, The chamber is divided into a first partial chamber and a second partial chamber which are formed separately from each other in the inside of the variable body so that the compression bag can simultaneously press the outer surface of the bent portion at different pressures simultaneously. Is a first inlet connected to said first sub-chamber and a second inlet to said second inlet connected to said subchamber. The method of claim 1, And a pressurizing member disposed inside the bend to resist the pressing force of the pressure bag so as to press the inner surface of the bend in an outward direction. The method of claim 11, The pressure member is a pressure resistance test apparatus, characterized in that made of a flexible material that can expand when fluid is introduced therein so as to change the internal pressure of the bent portion. The method of claim 1, And a reinforcement member disposed inside the bend to support the bend to reinforce the structural strength of the bend. The method of claim 1, And a support panel disposed on the base to support at least a portion of the membrane including the peripheral portion of the bend. In the pressure resistance test method of the membrane for inspecting the pressure resistance characteristics of the membrane having a bend, a) placing the membrane on a base; b) covering the bent portion with a tunnel-type housing having an accommodating space for accommodating the bent portion, and arranging a pressure bag having a variable body capable of expanding the volume by fluid injection between the bent portion and the tunnel-type housing. Making a step; c) pressing the tunnel-like housing to the membrane; d) pressurizing the bent portion by expanding the pressure tube by supplying a fluid to the pressure bag. The method of claim 15, Step c) is the internal pressure test method of the membrane, characterized in that for fixing the tunnel-type housing to the base using a fixing means. The method of claim 15, Before the step d), the pressure member is disposed in the interior of the curved part to resist the pressing force of the pressure bag to press the inner surface of the curved part in an outward direction, and to supply the fluid to expand the pressure member inside the curved part The pressure resistance test method of the membrane, characterized in that it further comprises the step of varying the pressure. The method of claim 15, Before the step d), the internal pressure test method of the membrane further comprising the step of arranging a reinforcing member for reinforcing the structural strength of the bent by supporting the bent portion. The method of claim 15, Before the step (a), further comprising disposing a support panel on the base that can affect the pressure resistance characteristics of the membrane, The step (a) of claim 1, wherein the membrane is placed on the base such that at least a portion of the membrane including the periphery of the bend is placed on the support panel. The method of claim 15, After the step d), using the strain measuring device further comprises the step of measuring the amount of deformation of the bent portion of the membrane.

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