KR100529251B1 - Tube Leak Tester and Tube Leak Test Method using it - Google Patents

Abstract

The present invention relates to a tube leak test equipment for sealing the tube ends and pressurizing the air during the leak test of the tube used in the equipment, such as heat exchanger, whether the leak according to the change in the internal pressure, the equipment of the present invention Is connected to receive air to two places, the pneumatic device 140 having a plurality of valves for supplying or exhausting air, and a plurality of pressure setting switch for setting the pressure to be supplied or exhausted, and the supply from the pneumatic device An air distributor 110 having a plurality of first and second air supply ports communicating with the two supply passages and the supply passages so as to receive the supplied air, respectively, and distribute the supplied air to several places; and the first and second air supplies. Connected to the spheres, each of which receives air from the air distributor, pressurizes one side of the tube and seals, and supplies a plurality of test air to check for leakage inside the tube. A plurality of sealing plugs 130 connected to the pressure plug 120 and the second air supply port to receive air from the air distributor and pressurize and seal the other side of the tube, and are connected to the pneumatic device to control the pneumatic device and It includes a control device that checks the pressure inside and detects and displays whether the tube leaks. The present invention has the effect of improving the workability, because the multi-tube test at the same time, as well as sealing, pressurizing, maintaining, and automatically performing the remote control operation.

Description

Tube Leak Test Equipment and Tube Leak Test Method Using It {Tube Leak Tester and Tube Leak Test Method using it}

The present invention relates to a leak test equipment of the tube, and in particular, during the leak test of the tube used in the equipment, such as heat exchanger sealing the both ends of the tube and pressurized the air inside the tube to determine whether the leakage according to the internal pressure change It relates to leak test equipment. The present invention also relates to a method for testing the leakage of a tube using the above equipment.

Tubes used in equipment such as heat exchangers may leak due to rupture, pinhole formation, and corrosion defects with prolonged use. Thus, the tube is leak-tested at regular intervals to check the integrity of the tube.

Conventionally, as a method for a tube leakage test, the cylindrical packings are respectively mounted at the inlet and outlet of the tube, and then the rods penetrating the packing center are longitudinally pulled to seal the inlet and outlet of the tube by compressing and expanding the packing. At this time, a pressurized flow path is formed at the central portion of the rod extending the packing. When the inlets and outlets of the tubes were sealed as described above, the integrity of the tubes was tested for pressure for a predetermined time after pressurizing the inside of the tubes through the pressure passage.

In addition, conventionally, a method of expanding a packing by pulling a lever and using a tool of an air gun type configured to move the rod forward and backward as a packing expansion method for sealing and manually operating a pressure valve inside the tube was mainly used.

However, the conventional techniques are not only inconvenient because the work is operated by manually operating the air injection valve after installing the device in the tube, but also has the disadvantage of increasing the fatigue of the operator when working for a long time. In addition, since the conventional technologies are limited to individual test methods of tubes, multi-thermal tests are required to reduce manpower in facilities requiring a large number of tests (for example, 4,000 to 8,000 per unit in a nuclear power plant). There is a problem that is difficult to apply. In addition, since the prior art visually checks whether the tube is leaked through an analog pressure gauge, it is difficult to detect a pressure change when a minute leak occurs, which makes it difficult to determine whether the leak is accurate.

Therefore, the present invention has been made in order to solve the problems of the prior art as described above, by artificially sealing the inlet and outlet of the tube to apply pressure to the inside to detect the leakage after a certain time to check the integrity of the tube The purpose of the present invention is to provide a tube leakage test equipment and a tube leak test method using the same, in which multiple tubes are tested at the same time as well as sealing, pressurizing, maintaining, and automatically performing remote control.

The present invention for achieving the above object is to provide a leak test equipment of the tube for leak testing a plurality of tubes at the same time, is connected to receive air from the air supply to two places, a plurality of valves for supplying or exhausting air And a pneumatic device having a plurality of pressure setting switches for setting the pressure to be supplied or exhausted, and each of the two supply passages and the supply passages so as to receive and supply air supplied from the pneumatic apparatuses to each other. An air distributor having a plurality of first and second air supply ports communicating therewith, and connected to the first and second air supply holes, respectively, to receive air from the air distributor and pressurize one side of the tube to seal the tube. A plurality of pressurized plugs for supplying test air for checking whether there is leakage inside the air, and connected to the second air supply port A plurality of sealing plugs which receive air from the distributor and pressurize the other side of the tube to seal the other side; Characterized in that.

In addition, the present invention provides a leak test method for testing the leakage of the tube using the leak test equipment of the tube configured as described above, by operating the pneumatic device to supply air through the first air supply port Sealing both ends of the tube with the pressure plug and the sealing plug, and determining whether the tube is sealed through the control device; and supplying pressurized air to the inside of the tube through the second air supply port to maintain the inside of the tube. Determining whether the tube is leaked by pressurizing for a time period, and stopping when the leak test is completed.

In the following, with reference to the accompanying drawings a preferred embodiment of the tube leakage test equipment and the tube leakage test method using the same according to the present invention will be described in detail.

The leak test equipment of the tube according to the present invention is fixed to the air distributor 110 and the air distributor 110 configured to distribute and supply air to various places, respectively, and receives air from the air distributor 110, the tube (T). A plurality of pressure plugs 120 and sealing plugs 130 for pressing and sealing both ends of the) and air from the external air supply device to supply air to the air distributor 110 to pressurize the plug 120 And a pneumatic device 140 for sealing the tube T through the sealing plug 130 and supplying air therein, and controlling the pneumatic device 140 and checking the pressure in the tube T to check the tube T. ) It is composed of a control unit that detects and displays whether or not leakage is detected.

1 is a schematic diagram of an air distributor constituting the leak test equipment of the tube according to the present invention. As shown in FIG. 1, the air distributor 110 has a plurality of holes 111 each supporting the pressure plug 120 and the sealing plug 130 so that a plurality of tubes T can be tested at the same time. It is formed at intervals. In addition, the air distributor 110 has air supply passages 112 formed in the vertical direction thereof, respectively. The air supply passage 112 is formed with first and second air supply ports 113 and 114 respectively corresponding to the number of holes 111. And, both ends of the air distributor 110 is formed with a handle 115 for convenient transport, respectively.

Figure 2 is a cross-sectional view showing the configuration of the pressure plug constituting the equipment of the present invention. As shown in FIG. 2, the pressure plug 120 is provided with a pressure cylinder 121 providing a sealing force of the tube by compressing and expanding the packing by installing a rubber packing around the cylinder rod 122, and the cylinder rod. The rubber packing 123 is formed around the 122 and can be inserted into the tube T to be tested, and the rubber rod 123 is fixed to the end of the cylinder rod 122 to fix the rubber packing 123. In the installation) is guided for easy insertion and after the installation in the tube consists of a nozzle guide portion 124 to serve as an auxiliary for supporting the pressure plug 120 horizontally.

The pressurized cylinder 121 is configured to provide a sufficient sealing force (for example 45kgf) to be applied to a wide range of test pressures using air (for example, 8㎏ / ㎠) used in a general industrial site As the end of the cylinder rod 122, a thread is formed so that the nozzle guide portion 124 is screwed, and the rear end of the cylinder 121 may be screwed to the hole 111 of the air distributor 110. It is configured to. In addition, the pressurized cylinder 121 operates a cylinder rod 122 to pressurize the air supply port 125 for supplying air for compressing and expanding the rubber packing 123, and test air for a tube leakage test of the cylinder rod ( Test air supply ports 126 for supplying along the inside of 122 are respectively formed. At this time, the pressurized air supply port 125 and the test air supply port 126 are connected to the first and second air supply ports 113 and 114 of the air distributor 110 by a tube (not shown). In addition, a flow path through which air can flow is formed in the cylinder rod 122, and the flow path communicates with the test air supply port 126.

In addition, the rubber packing 123 provides a frictional force such that the pressure plug 120 does not come out due to an impact acting when pressurizing the test pressure inside the tube or a mistake of an operator. Is thicker than the tube to contact the end of the tube to provide a higher sealing force. That is, when inserted into the tube (T), one side of the rubber packing 123 is in surface contact with the end of the tube and the other portion has a form that is inserted into the tube.

In addition, the nozzle guide part 124 is configured to have the same diameter as the rubber packing 123, and an internal thread is formed to be assembled to the end of the cylinder rod 122 in one side. In addition, the nozzle guide portion 124 has a flow path through which air can flow along the inside thereof is formed along the center thereof, and the tip is configured in a conical shape to facilitate insertion into the tube. This flow path is in communication with the flow path of the cylinder rod 122.

3 is a cross-sectional view showing the configuration of the sealing plug constituting the equipment of the present invention. As shown in FIG. 3, the sealing plug 130 only supplies air for sealing the tube and does not need to supply test air for leak testing of the tube. It is configured in the same manner as the pressure plug 120 except that there is no need to form a test air supply port for supply and no flow path is formed in the cylinder rod 132.

Figure 4a is a schematic diagram showing the configuration of the pneumatic device constituting the equipment of the present invention. As shown in Figure 4a, the pneumatic device 140 of the present invention is the air for sealing the both ends of the tube (T) and the test air for testing whether the tube leaks the pressure plug 120 and the sealing plug 130 Are respectively supplied.

That is, the pneumatic device 140 is connected to the first and second air regulators 141 and 142 and the first air regulator 141 which is supplied by distributing the supplied air into two, and pressurizes both ends of the tube T. And the first and second solenoid valves S / V1 and S / V2 for supplying or exhausting air through the sealing cylinders 121 and 131 to pressurize and seal the air, and the second air regulator 142 to connect the tubes. And the third and fourth solenoid valves (S / V3, S / V4) for supplying or exhausting the test air for testing the leakage of the gas. In addition, the pneumatic device 140 is installed in the lines of the first and second solenoid valves (S / V1, S / V2) and the first air pressure setting switch (Ps1) for setting the air pressure supplied along the line and And second and third air pressure setting switches Ps2 and Ps3 installed in the line of the third solenoid valve S / V3 to set the air pressure supplied or exhausted along the line. In addition, the pneumatic device 40 is pressurized to press and seal both ends of the tube (T), the first time setting timer (Tr1) for setting the minimum operating time of the sealing cylinder (121, 131), and whether the tube leaks And a second time setting timer Tr2 for setting a minimum supply time of test air for testing, and a third time setting timer Tr3 for setting a test holding time for leaking of a tube.

The pneumatic device 140 configured as described above operates as shown in Table 1.

Operation mode Pressurized / Sealed Air Supply Leakage test air supply Leakage test Leakage test air exhaust Pressurized / Sealed Air Exhaust Setting switch, timer Ps1, Tr1 Ps2, Tr2 Ps2, Tr3 Ps3, Tr4 Ps3, Tr5 S / V1 work work work work S / V2 work S / V3 work S / V4 work

In Table 1, Tr4 and Tr5 are set to PLC of controller to remove residual pressure of air used for leakage of tube, and pressurize and seal both ends of tube T through pressurization and sealing cylinders 121 and 131. Each means a set timer to remove the residual pressure of the air.

4B shows the operation relationship of the pneumatic device 140 in a graph. Figure 4b is a diagram showing the operation of the pneumatic device shown in Figure 4a.

And, the control device of the present invention is configured to remotely control by using a PLC to automatically perform sealing, pressurization, test time maintenance, pressure change detection of both ends of the tube (T), pressure, test of the pneumatic device 140 Air pressurization pressure, pressurization time, holding time after pressurization, fluctuations in test pressure during holding time, visual and audible indications for leak detection, power loss or cylinder pressure loss of pressurizing and sealing plugs 120 and 130 during testing. Interlock device for safety accident prevention, 1 cycle automatic configuration function.

The control panel of these controls includes the Power Lamp (Power On / Off), Power On / Off (Power Switch), E / M Stop (Emergency Stop Button), Auto / Manual (1 Cycle Manual and Auto Select Switch), Auto Start (1 Cycle auto operation button in Auto Mode), Stop BTN (stop operation and device reset button), ERR Lamp (lights when the seal is abnormal due to cylinder leakage, etc.), OK Lamp (lights when the test result is OK), LEAK Lamp ( Test results light up when leaking), Cyl Fixing BTN (Pressure and sealing cylinder operation button in manual mode), Test_Air In BTN (Tube press operation button in manual mode), Test_Time Delay (Pressure holding operation button in manual mode), Buzzer (ERR Alarm when lighted), Loader (Program Loader Connector), Fixing Timer (Pressure and Seal Cylinder Operation Time Setting Timer), Test_Air In Timer (Test Air Press Time Setting Timer), Test_Delay Timer (Test Time Hold Setting Timer), Fixture Pr S / W (Pressure and Seal Cylinder Pressure Display and Control Pressure Set pressure gauge), Test Pr S / W (test pressure display and control pressure set pressure gauge), Fixture Air Regu (pressurized and sealed cylinder operating pressure regulator-first air regulator (141)), Test Air Regu (test pressure regulator-first) 1 Air Regulator (142)), Fixture Air Out Port (Pressure and Seal Cylinder Air Supply Port), Test Air Out Port (Test Air Supply Port), Main Air In Port (Main Air Supply Port), and Main Power Socket ( Main power socket is formed.

In addition, the control device of the present invention does not pressurize the test air when the pressure of the pressure plug 120 and the sealing plug 130, the sealing cylinder (121, 131) does not operate normally, in the pressurized state of the test air, The program is configured so that the operating air of the sealing cylinders 121 and 131 is not exhausted. In addition, the control apparatus of the present invention exhausts, pressurizes, and seals the test air in consideration of safety when the pressurization and sealing cylinders 121 and 131 are abnormal during the pressurization test or when the 1 cycle test is completed or when the stop and emergency stop buttons are operated. The program is configured to operate in the exhaust sequence of the device cylinders 121, 131. The control unit is programmed to generate an alarm sound in all modes together with an error alarm in case of abnormality (including test tube leakage).

The control device of the present invention configured as described above has to reach the set pressure of the first air pressure setting switch Ps1 within the time specified by the first time setting timer Tr1 after the cylinder fixing P / B operation to proceed to the next operation. If not, Error lamp is turned on (buzzing). If the step operates with the normal signal, the OK lamp is turned on when the set pressure of the second air pressure setting switch Ps2 is reached within the time specified by the second time setting timer Tr2 after the Test Air In P / B operation. Leak lamp is lit (buzzing). If the normal operation is performed with the OK lighting signal of the above step, the OK lamp is maintained when the set pressure of the second air pressure setting switch Ps2 is maintained for a predetermined time in the third time setting timer Tr3 after the Test Time Delay P / B operation. Lights up continuously, and if the pressure is not maintained and it turns out to be a leak, the Leak lamp lights up and the buzzer sounds.

The present invention configured as described above is configured to generate an alarm sound together with an error alarm even when the sealing state of any one of the tubes is poor or leaks when multiple tubes are simultaneously leaked.

In the following, a method of testing the leakage of the tube using the tube leakage test equipment of the present invention configured as described above will be described.

First, the test method according to the manual operation of the operator will be described as follows. 5a is a flowchart illustrating a process of manually inspecting whether a tube leaks using a leak test apparatus of the tube according to the present invention.

As shown in FIG. 5A, first, power is connected to a 220V single phase (S111), and an Air line is connected to an air main input port. Then, turn on the power ON / Off selection switch (S112), manually switch the selection switch for manual and automatic selection (S113), and then press Cyl Fixing P / B in the push BTN for operation (S114). At this time, if the condition is not satisfied, error light and alarm sound will be sounded. In this case, check the timer setting and check the set pressure (for example, 6kg / ㎠). Then, the Test Air In P / B of the push Push BTN for operation (S115). At this time, if the condition is not satisfied, error light and alarm sound will be sounded. In this case, check the timer setting and check the set pressure (for example, 3kg / ㎠). If there is no abnormality, the tube is leaked. Then, press the Test Time Delay P / B of the push BTN for operation (S116). As a result, if the test result is unsatisfactory, an error light and an alarm sound. At this time, the set pressure is checked. If there is no abnormality, the tube leaks. During the test, press P / B in reverse order to cancel the operation mode step by step. When the test is completed, press Stop P / B to return all functions to the initial ready state (S117).

Next, the test method according to the automatic operation of the operator will be described as follows. Figure 5b is a flow chart showing a process of automatically checking the leakage of the tube using the tube leak test equipment according to the present invention.

As shown in Figure 5b, first, the power supply is connected to the 220V two-phase (S121), the air line is connected to the air main input port. Then, turn on the power ON / Off selection switch (S122), and automatically switch the selection switch for manual and automatic selection (S123), and then press the Auto Start P / B of the push Push BTN for operation (S124). At this time, if there is no error (ON) Fixing Lamp On (S125), if there is an error, the STOP P / B lamp is turned on and an alarm sounds. If there is any problem, check the Auto Start P / B operation and check the power shortage. Then, if there is no error (ON) Test Air In Lamp On (S126), if there is an error, an error light and an alarm sound. If there is a problem like this, check the timer setting and check the set pressure (for example, 6kg / ㎠).

Then, if there is no error (OK Lamp ON) Test Time Delay Lamp On (S127), if there is an error, OK Lamp OFF and alarm sounds. If there is a problem like this, check the timer setting and check the set pressure (for example, 3kg / ㎠). If there is no abnormality, the tube is leaked. Then, if there is no error (keep OK Lamp ON), the lamp is turned off in the reverse order (S128), and if there is an error, an error light and an alarm sound sound. If there is a problem like this, check the timer setting and check the set pressure (for example, 3kg / ㎠). If there is no abnormality, the tube is leaked. In this way, when the leak test is completed, the STOP P / B is turned on (S129).

As described in detail above, the present invention artificially seals the inlet and outlet of the tube and then applies pressure therein to detect leakage after a certain time to check the integrity of the tube. Since the operation is automatically performed by remote operation, maintenance and determination, workability is improved.

In addition, the present invention has the advantage that the accuracy of the inspection is improved and the working speed is faster because it detects the pressure change by the digital pressure sensor automatically determines whether the leak.

In addition, the present invention has the effect of reducing the risk of safety accidents because the plug is sealed on both ends of the tube and automatically tested by remote operation.

Although the technical details of the leak test equipment of the tube of the present invention and the leak test method of the tube using the same have been described with the accompanying drawings, this is by way of example and not by way of limitation. .

In addition, it is obvious that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

1 is a schematic diagram of an air distributor constituting the leak test equipment of the tube according to the present invention,

2 and 3 are cross-sectional views showing the configuration of the pressure plug and the sealing plug constituting the equipment of the present invention, respectively,

Figure 4a is a schematic diagram showing the configuration of the pneumatic device constituting the equipment of the present invention,

Figure 4b is a graph showing the operating relationship of the pneumatic device shown in Figure 4a,

5a and 5b is a flow chart illustrating a process of manually and automatically inspecting whether the tube leaks using the leak test equipment of the tube according to the present invention.

  ♠ Explanation of symbols on the main parts of the drawing ♠

110: air distributor 111: hole

112: air supply passage 113: first air supply port

114: second air supply port 115: the handle

120: pressure plug 121: pressure cylinder

122: cylinder rod 123: rubber packing

124: nozzle guide portion 125: pressurized air supply port

126: test air supply port 130: sealing plug

131: sealing cylinder 140: pneumatic device

141: first air regulator 142: second air regulator

Claims (8)

Leakage test equipment for tubes that leak test several tubes at the same time, A pneumatic device, connected to receive air from two air supply devices, having a plurality of valves for supplying or exhausting air, a plurality of pressure setting switches for setting a pressure to be supplied or exhausted, and a supply from the pneumatic device An air distributor having two supply passages and a plurality of first and second air supply ports respectively communicating with the supply passages so as to receive the supplied air and distribute the same to various places; and the first and second air supply holes. A plurality of pressure plugs connected to the plurality of pressurized plugs to supply air from the air distributor, respectively, to pressurize and seal one side of the tube and to check whether there is a leak inside the tube, and to the second air supply port. A plurality of sealing plugs which receive air from the air distributor and pressurize the other side of the tube to seal the air; and a pneumatic device connected to the pneumatic device Control value, and the leakage test equipment of the tube, characterized in that to check the pressure in the tube and a control device for displaying by sensing whether there is any leak from the tube. According to claim 1, wherein the pressure plug has a cylinder rod formed along the center of the flow path for the test air flows from the second air supply port, the cylinder rod is supplied air from the first air supply port A pressurized cylinder configured to operate by; A rubber packing installed around the cylinder rod to compressively expand and seal the end of the tube according to the operation of the pressure cylinder; It is installed at the end of the cylinder rod to fix the rubber packing, the tube leakage test equipment, characterized in that it comprises a nozzle guide portion formed along the center flow path communicating with the flow path of the cylinder rod. 2. The sealing apparatus of claim 1, wherein the sealing plug has a cylinder rod, the sealing rod configured to operate by the air supplied from the first air supply port; A rubber packing installed around the cylinder rod to compress and expand according to the operation of the sealing cylinder to seal the end of the tube; And a nozzle guide part installed at the end of the cylinder rod to fix the rubber packing. According to claim 2 or 3, Leak test equipment of the tube, characterized in that one side of the rubber packing has a thickness thicker than the tube to be in surface contact with the end of the tube. According to claim 1, wherein the air distributor is formed with a plurality of holes for fixing the pressure plug or the sealing plug, characterized in that the circumference of the pressure plug or the sealing plug is screwed to the hole. Leakage test equipment for tubes. A leak test method for testing a leak of a tube by using the leak test equipment of the tube according to claim 1, Operating the pneumatic device to supply air through the first air supply port to seal both ends of the tube with the pressure plug and the sealing plug, and determining whether the air is sealed through the control device; Supplying pressurized air to the inside of the tube through a sphere and pressurizing the inside of the tube for a predetermined time to determine whether the tube is leaked, and stopping the tube, characterized in that the step of stopping when the leak test is complete; Test Methods. The method of claim 6, wherein an error light and an alarm sound when a leakage occurs through the pressure plug or the sealing plug. The method of claim 6, wherein an error light and an alarm sound when the tube leaks.