Inspection Equipment

Abstract

To conduct a leak detection of a welded part between a flange and a tube.SOLUTION: A detection device for detecting a welding failure of a joint obtained by welding a cylindrical work 20 and a flange 11, and comprises: an insertion member 110 inserted inside the work, held in the inner periphery of the work, and sealing the inner peripheral surface of the work; a cap 120 having an inner diameter larger than the outer diameter of the work on the side in contact with the flange, and having a sealing part 122 in contact with the flange surface of the flange outside the outer periphery of the work to seal the space with the flange; an injection part 160 for injecting gas into a welding area which is a space surrounded by the cap, the insertion member, the work and the flange; and a measurement part 164 for measuring the pressure of the welding area.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a testing device for testing for leaks. [Background technology]

[0002] Cited Document 1 discloses an inspection device that detects leaks in welded joints between pipes. This inspection device provides rubber seals that expand with gas at predetermined positions on the inner and outer periphery of the pipe, injects helium gas into the pipe after sealing, and evacuates the inner periphery of the pipe to inspect for leaks in the welds. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-132784 A Summary of the Invention [Problem to be solved by the invention]

[0004] The inspection device described in Patent Document 1 cannot perform a leak inspection of the welded portion between the flange and the tube when one of the members to be welded is a flange. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present disclosure, an inspection device is provided for inspecting a weld defect of a joint formed by welding a cylindrical workpiece and a flange. The inspection device includes an insert member that is inserted inside the workpiece and held on the inner circumference of the workpiece and seals the inner circumference surface of the workpiece, a cap that has an inner diameter larger than the outer diameter of the workpiece on the side that contacts the flange and has a seal portion that contacts the flange surface of the flange outside the outer circumference of the workpiece to seal between the flange and the cap, an injection portion that injects gas into a welding area that is a space surrounded by the cap, the insert member, the workpiece, and the flange, and a measurement portion that measures the pressure of the welding area. The inspection device of the above embodiment seals the inner circumference side of the workpiece with the insert member and seals the flange surface with the seal portion of the cap, thereby making the welding area surrounded by the cap, the workpiece, the flange, and the insert member into a closed space. As a result, a leak inspection of the weld between the workpiece and the flange can be performed by injecting gas into the welding area and measuring the pressure of the welding area thereafter. (2) In the inspection device of the above aspect, the insertion member may be a clamper that is radially expandable by gas. The inspection device of this aspect can seal the inner peripheral surface of the workpiece with a simple structure of a clamper that is radially expandable by gas. (3) The present disclosure may be realized in various forms other than an inspection device, such as an inspection device that inspects for welding defects in a joint formed by welding a cylindrical workpiece and a flange. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an explanatory diagram showing a shell-and-tube type heat exchanger. [Diagram 2] FIG. 2 is a plan view of a shell-and-tube type heat exchanger. [Diagram 3] FIG. 3 is an explanatory diagram showing a cross section taken along line III-III of FIG. 2. [Figure 4] FIG. 1 is an explanatory diagram showing an inspection device according to a first embodiment. [Diagram 5] FIG. 4 is an explanatory diagram showing a clamper expansion control unit. [Figure 6] FIG. 2 is an explanatory diagram showing an injection section and a measurement section. [Figure 7] FIG. 11 is an explanatory diagram showing a process of inspecting the welded portion for leaks. [Figure 8] FIG. 11 is an explanatory diagram showing an inspection device according to a second embodiment. [Figure 9] FIG. 11 is an explanatory view showing a sleeve used in the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A. Shell and tube type heat exchanger: 1 is an explanatory diagram showing a shell-and-tube type heat exchanger 10. The shell-and-tube type heat exchanger 10 is inserted and disposed between two pipes 200, 202, and is a heat exchanger that exchanges heat between a fluid flowing through the two pipes 200, 202 and a heat medium.

[0009] Fig. 2 is a plan view of the shell-and-tube type heat exchanger 10. Fig. 3 is an explanatory diagram showing a cross section taken along line III-III of Fig. 2. The shell-and-tube type heat exchanger 10 includes a pair of flanges 11, a side surface 15, a plurality of tubes 20 which are cylindrical workpieces, a heat medium supply port 30, and a heat medium discharge port 31. The side surface 15 shown in Fig. 3 is a cylindrical member having a cylindrical shape, and the flanges 11 having a disk shape are attached to both ends of the side surface 15.

[0010] The flange 11 has a plurality of holes 13 on the inside of the position where the side surface 15 is attached. As shown in Fig. 3, a tube 20 is inserted into each of the plurality of holes 13. The inside of the tube 20 forms a fluid flow path 21 through which the fluid flowing from the pipe 200 flows. In the example shown in Fig. 2, for convenience of illustration, the number of tubes 20 is shown as 19, but 19 is just one example, and the number of tubes 20 may be several tens to several hundreds or more.

[0011] In the flange 11, the surface opposite to the surface to which the side surface 15 is attached is called the flange surface 14. As shown in Fig. 3, on the inner circumference of the hole 13, the end of the tube 20 in the longitudinal direction and the flange surface 14 are welded by a welded portion 25. That is, the shell-and-tube type heat exchanger 10 is a joint formed by welding the cylindrical tube 20 and the flange 11. As shown in Fig. 2, the welded portion 25 has a circular shape along the inner circumference of the hole 13.

[0012] As shown in FIG. 3, the heat medium supply port 30 is provided on the side surface 15 at a position close to the flange 11 on the pipe 202 side, and the heat medium discharge port 31 is provided on the side surface 15 at a position close to the flange 11 on the pipe 200 side. The heat medium passes through the heat medium flow path 22 formed by the side surface 15, the two flanges 11, and the outside of the tube 20 from the heat medium supply port 30, and is discharged from the heat medium discharge port 31. In the first embodiment, the flow direction of the fluid flowing through the fluid flow path 21 and the flow direction of the heat medium flowing through the heat medium flow path 22 are counter flows in the opposite directions. Note that the flow direction of the fluid flowing through the fluid flow path 21 and the flow direction of the heat medium flowing through the heat medium flow path 22 may be parallel flows in the same direction. The shell-and-tube type heat exchanger 10 exchanges heat between the fluid flowing through the fluid flow path 21 inside the tube 20 and the heat medium flowing through the heat medium flow path 22 outside the tube 20.

[0013] An outer edge portion 12 is provided on the outer edge of the flange surface 14. The outer edge portion 12 is used to connect the shell-and-tube type heat exchanger 10 to the pipes 200, 202. Note that the shell-and-tube type heat exchanger 10 may have a flange 11 with a large outer diameter without the outer edge portion 12, and the flange 11 and the pipes 200, 202 may be connected to each other.

[0014] B. Inspection apparatus according to the first embodiment: 4 is an explanatory diagram showing an inspection device 100 according to the first embodiment. The inspection device 100 is an inspection device that inspects the presence or absence of a leak in a welded portion 25 between a tube 20 and a flange surface 14. The inspection device 100 includes a clamper 110, a cap 120, a shaft 130, and a nut 140.

[0015] The clamper 110 is an insertion member that is inserted into the inside of the tube 20 from the flange surface 14 side. The clamper 110 is formed of an elastic member such as rubber. The outer diameter of the clamper 110 is smaller than the inner diameter of the tube 20. When gas is injected into the clamper 110, the clamper 110 expands. The expanded clamper 110 comes into contact with the inner peripheral surface of the tube 20 as shown by the dashed line in FIG. 4, and the contact pressure at this time holds and fixes the clamper 110 to the tube 20 at a position where the central axis of the clamper 110 is approximately aligned with the central axis O of the tube 20. At this time, the contact pressure of the clamper 110 seals between the inner peripheral surface of the tube 20 and the clamper 110.

[0016] The shaft 130 is a hollow cylindrical member, and one end (the lower end in FIG. 3) is connected to the end of the clamper 110. A connector 134 is connected to the other end of the shaft 130. Gas for inflating the clamper 110 is supplied to the clamper 110 from the connector 134 through the shaft 130. A male thread 132 is cut on the outer periphery of the shaft 130.

[0017] The cap 120 is a hollow cylindrical member. The cap 120 is disposed on the outside of the shaft 130. That is, an open cylindrical surface 121 is formed at the end of the cap 120 opposite to the flange 11, and the shaft 130 is inserted into this cylindrical surface 121. A circumferential groove 126 is formed in the cylindrical surface 121, and an O-ring 128 is disposed in the circumferential groove 126 to seal between the cap 120 and the shaft 130. On the flange 11 side of the cap 120, the inner diameter of the cap 120 is larger than the outer diameter of the tube 20. On the end face of the cap 120 on the flange 11 side, a face seal portion 122 that contacts the flange surface 14 is provided. The face seal portion 122 has a disk shape with a hole in the center. The inner diameter of this hole is larger than the outer diameter of the tube 20. The outer diameter of the face seal portion 122 is large enough not to come into contact with the welded portion 25 of the tube 20 adjacent to the tube 20 to be inspected. It is noted that the outer diameter of the face seal portion 122 is sized so as not to come into contact with the weld 25 of the tube 20 adjacent to the tube 20 being inspected; however, as long as the face seal portion 122 can be used to seal around the weld 25 of the tube 20 being inspected, the face seal portion 122 may come into contact with the adjacent tube 20 or the weld 25 of the adjacent tube 20 outside the sealing position.

[0018] A communication hole 123 that communicates between the inside and outside of the cap 120 is provided on the side of the cap 120. A connector 124 is connected to the communication hole 123. The communication hole 123 and the connector 124 are used to supply gas to a welding area 150, which is a space surrounded by the cap 120, the clamper 110, the tube 20, the flange 11, and the shaft 130, or to exhaust gas from the welding area 150.

[0019] The nut 140 has a female thread 142 that screws into the male thread 132 of the shaft 130. When an operator tightens the nut 140, the face seal portion 122 of the cap 120 is pressed against the flange surface 14, thereby forming a seal between the face seal portion 122 and the flange surface 14. The nut 140 may be provided with a handle 144 for turning the nut.

[0020] FIG. 5 is an explanatory diagram showing the clamper expansion control unit 135. The clamper expansion control unit 135 includes a pump 136 and a clamper valve 137. The pump 136 supplies gas to the clamper 110 of the inspection device 100 through the clamper valve 137 and the connector 134 connected to the shaft 130. This increases the pressure inside the clamper 110, causing the clamper 110 to expand. The clamper valve 137 includes an EXH that closes when the clamper valve 137 is open and opens when the clamper valve 137 is closed. When the clamper valve 137 is open, the EXH is closed and the pressure inside the clamper 110 is maintained. On the other hand, when the clamper valve 137 is closed, the EXH is opened and the pressure inside the clamper 110 is released. As a result, the clamper 110 is not expanded.

[0021] FIG. 6 is an explanatory diagram showing the injection unit 160 and the measurement unit 164. The injection unit 160 supplies gas to the welding area 150 or discharges gas from the welding area 150 via the connector 124. The injection unit 160 includes a pump 161, an inspection valve 162, and a residual pressure exhaust valve 163. With the injection unit 160 in a state where the inspection valve 162 is open and the residual pressure exhaust valve 163 is closed, the operator supplies gas from the pump 161 to the welding area 150 via the inspection valve 162 and the connector 124, and makes the pressure in the welding area 150 equal to or higher than atmospheric pressure. In this state, the operator closes the inspection valve 162, measures the pressure in the welding area 150 with the measurement unit 164, and inspects for the presence or absence of a leak. The measurement unit 164 is a pressure gauge that measures the pressure in the welding area 150. After completing the leak inspection, the worker opens the residual pressure exhaust valve 163 to exhaust gas from the welding area 150 through the residual pressure exhaust valve 163 .

[0022] 7 is an explanatory diagram showing the process of inspecting the welded portion 25 for leaks. In step S100, an operator inserts the clamper 110 into the tube 20 until the face seal portion 122 of the cap 120 presses against the flange surface 14. In this state, the seal between the face seal portion 122 and the flange surface 14 does not have to be completely sealed.

[0023] In step S110, the worker opens the clamper valve 137 and injects gas from the pump 136 into the clamper 110 via the connector 134 and the shaft 130. As a result, the clamper 110 expands radially around its central axis and comes into contact with the inner circumferential surface of the tube 20. The clamper 110 is held and fixed to the tube 20 at a position where the central axis of the clamper 110 is approximately aligned with the central axis O of the tube 20, as shown by the dashed line in FIG. 4. At this time, the clamper 110 seals the inner circumferential surface of the tube 20 by the contact pressure with the tube 20. Here, when the clamper 110 expands radially, the clamper 110 shrinks slightly in the direction along the central axis. As a result, a force that moves the cap 120, the shaft 130, and the nut 140 toward the flange surface 14 is generated, and the sealing performance between the face seal portion 122 and the flange surface 14 is improved.

[0024] In step S120, the worker tightens the nut 140 (FIG. 4) to further press the face seal portion 122 of the cap 120 against the flange surface 14. This can further improve the sealing performance between the face seal portion 122 and the flange surface 14.

[0025] In step S130, the worker opens the inspection valve 162 (FIG. 6) to supply gas into the welding area 150, thereby increasing the pressure in the welding area 150.

[0026] In step S140, the worker closes inspection valve 162 (FIG. 6) to make the welding area 150 a closed space. If there is no leak in the welded portion 25, the pressure inside the welding area 150 is maintained, whereas if there is a leak in the welded portion 25, the pressure inside the welding area 150 decreases.

[0027] In step S150, after a certain time has elapsed since step S140, the worker uses measuring unit 164 (FIG. 6) to measure the pressure inside welding area 150 and determines whether the pressure inside welding area 150 has decreased. If the pressure inside welding area 150 has not decreased, the worker transitions the process to step S160, and if the pressure inside welding area 150 has decreased, the worker transitions the process to step S170.

[0028] In step S160, the operator determines that there is no leak in the welded portion 25 between the tube 20 and the flange 11 to be inspected, and proceeds to step S180. In step S170, the operator determines that there is a leak in the welded portion 25 between the tube 20 and the flange 11 to be inspected, and proceeds to step S180.

[0029] In step S180, the worker opens the residual pressure exhaust valve 163 to reduce the pressure within the welding area 150.

[0030] In step S190, the worker opens the clamper valve 137, exhausts air from the EXT of the clamper valve 137, and releases the residual pressure in the clamper 110. In this way, the worker puts the clamper 110 into an unexpanded state.

[0031] In step S200, the operator pulls out the clamper 110 from the tube 20 to be inspected. If the operator wishes to inspect the next tube 20, the operator returns to step S100 and executes the processes from step S100 to step S200.

[0032] As described above, the inspection device 100 of the first embodiment includes the clamper 110 that is inserted inside the tube 20, which is the workpiece of the shell-and-tube type heat exchanger 10, and is held on the inner circumference of the tube 20 while sealing the inner circumference of the tube 20, the cap that has an inner diameter larger than the outer diameter of the tube 20 on the side that contacts the flange 11 and has a face seal portion 122 that contacts the flange surface 14 of the flange 11 outside the outer circumference of the tube 20, and the nut that presses the cap 120 against the flange surface 14 to seal the face seal portion 122 and the flange 11. As a result, the operator can seal the inner circumference side of the tube 20 with the clamper 110, which is an insertion member, and seal the flange surface 14 of the flange 11 with the face seal portion 122 of the cap 120, thereby making the welding area 150 surrounded by the cap 120, the tube 20, the flange 11, and the clamper 110 into a closed space. An operator can perform a leak inspection of the welded portion 25 between the tube 20 and the flange 11 by injecting gas into the welding area 150 and measuring the pressure in the welding area 150 thereafter. Note that the shell-and-tube type heat exchanger 10 used in the first embodiment is described as an example of a structure having a welded portion 25 between the tube 20 and the flange 11. A user can use the inspection device 100 to inspect a welded portion between a tube and a flange for a leak of a structure other than the shell-and-tube type heat exchanger 10 as long as the structure has a welded portion between a tube and a flange.

[0033] The inspection device 100 of the first embodiment seals the inner circumference of the tube 20 on the side where the clamper 110 is inserted, thereby making the welding area 150 a closed space. Note that the inner circumference side of the tube 20 on the side where the clamper 110 is not inserted may be in an open state. This allows an operator to approach from one side and inspect the welded portion 25 on one side for leaks.

[0034] According to the inspection device 100 of the first embodiment, since the clamper 110 grips the inner circumference of the tube 20, the central axis of the clamper 110 can be centered on the central axis O of the tube 20.

[0035] According to the inspection device 100 of the first embodiment, when the clamper 110 expands and is held and fixed to the tube 20, a downward axial force is generated in the inspection device 100, and the face seal portion 122 of the cap 120 is strongly pressed against the flange surface 14. As a result, the sealing performance between the face seal portion 122 and the flange surface 14 can be improved.

[0036] According to the inspection device 100 of the first embodiment, an operator tightens the nut 140 to press the face seal portion 122 of the cap 120 against the flange face 14. As a result, the tubes 20 are arranged closely together, and sufficient sealing can be ensured even if the contact area between the flange face 14 of the flange 11 and the cap 120 is small.

[0037] According to the inspection device 100 of the first embodiment, the outer diameter of the clamper 110 in an unexpanded state is smaller than the inner diameter of the tube. Therefore, the clamper 110 can be easily inserted into the tube 20, and workability is high. Furthermore, burrs and beads of the tube 20 are likely to occur on the inner periphery of the end of the tube 20. Since the outer diameter of the clamper 110 in an unexpanded state is smaller than the inner diameter of the tube, an operator can insert the clamper 110 to a position where there are no burrs or beads and expand it, thereby performing inspection without being affected by burrs or beads. The operator can prevent damage to the inspection device caused by burrs and beads.

[0038] In step S150 (FIG. 7) of the first embodiment, the worker measures the pressure inside welding area 150 using measurement unit 164 (FIG. 6) a fixed time after step S140, and determines whether the pressure in welding area 150 has decreased. In this regard, in the first embodiment, the volume of welding area 150 can be configured to be the minimum volume, so that if a pressure fluctuation occurs in welding area 150, the worker can detect the pressure fluctuation in a shorter time than the fixed time without waiting for the fixed time.

[0039] According to the inspection device 100 of the first embodiment, leak inspection can be performed in parallel with welding work, so that any defective welds can be corrected immediately on the spot. As a result, the quality stability of the shell-and-tube type heat exchanger 10 can be improved, and the productivity can be improved. Similarly, the quality stability of the structure can be improved and the productivity can be improved even for structures having welded parts between tubes and flanges other than the shell-and-tube type heat exchanger 10.

[0040] C. Inspection apparatus according to the second embodiment: 8 is an explanatory diagram showing an inspection device 100b according to the second embodiment. The inspection device 100 of the first embodiment expands the clamper 110 to generate a radial force, and holds and fixes the clamper 110 to the inner circumference of the tube 20, thereby holding and fixing the inspection device 100. In contrast, the inspection device 100b of the second embodiment generates a radial force using a taper and an axial force.

[0041] The inspection device 100b of the second embodiment includes a clamper 110 and a bolt 170 and a sleeve 180 instead of the shaft 130. The sleeve 180 is disposed on the outer periphery of the bolt 170.

[0042] The bolt 170 includes a cylindrical portion 171 and a tapered portion 175. The cylindrical portion 171 is not inserted into the inside of the tube 20, but the tapered portion 175 is inserted into the inside of the tube 20. The cylindrical portion 171 has a constant outer diameter along the longitudinal direction. A male thread 172 is cut on the outer periphery of the cylindrical portion 171. The female thread 142 of the nut 140 can be screwed into the male thread 172. A handle 178 is attached to the end of the cylindrical portion 171 opposite the tapered portion 175.

[0043] The outer diameter of tapered portion 175 at the boundary with cylindrical portion 171 is approximately equal to the outer diameter of cylindrical portion 171 , but the outer diameter of tapered portion 175 increases toward end portion 176 , forming a tapered shape.

[0044] 9 is an explanatory diagram showing a sleeve 180 used in the second embodiment. The sleeve 180 includes a cylindrical portion 181 and a tapered portion 185. The cylindrical portion 181 has a constant inner diameter in the longitudinal direction. A female thread 182 that screws into the male thread 172 of the bolt 170 is cut on the inner circumference of the cylindrical portion 181.

[0045] Tapered portion 185 has a tapered shape in which the inner diameter of tapered portion 185 at the boundary with cylindrical portion 181 is approximately equal to the inner diameter of cylindrical portion 181, but the inner diameter becomes larger toward end portion 186. Tapered portion 185 is formed with a plurality of slits 187 in the longitudinal direction from end portion 186. Two circumferential grooves 188 are formed on the outer periphery of tapered portion 185 along the circumference, and O-rings 189 are fitted into circumferential grooves 188.

[0046] A cylindrical surface 121b that opens to the inner periphery is formed at the end of cap 120b opposite face seal portion 122b, and sleeve 180 is inserted into this cylindrical surface 121b. A circumferential groove 126b is formed in cylindrical surface 121b, and an O-ring 128b is disposed in circumferential groove 126b to provide a seal between cap 120 and sleeve 180.

[0047] With the male thread 172 of the bolt 170 and the female thread 182 of the sleeve 180 screwed together, the worker inserts the bolt 170 and the sleeve 180 into the tube 20 until the two O-rings 189 are positioned inside the tube 20. At this time, the worker does not need to attach the cap 120b and the nut 140 to the inspection device 100b.

[0048] The operator fixes sleeve 180, and while sleeve 180 is fixed, turns bolt 170 using handle 178 to move bolt 170 upward relative to sleeve 180. Tapered portion 175 of bolt 170 expands the diameter of tapered portion 185 of sleeve 180. As a result, O-ring 189 is pressed against the inner periphery of tube 20, and bolt 170 is held and fixed to tube 20 at a position where the central axis of bolt 170 approximately coincides with central axis O of tube 20. At this time, O-ring 189 seals between the inner periphery of tube 20 and sleeve 180.

[0049] The worker attaches the cap 120b and the nut 140 to the inspection device 100b, and tightens the nut 140 to press the face seal portion 122b of the cap 120b against the flange surface 14, sealing between the cap 120b and the flange surface 14 and forming a welding area 150b, which is a closed space.

[0050] As in the first embodiment, the worker performs a leak inspection of the welded portion 25 between the tube 20 and the flange 11 by injecting gas into the welded area 150b and measuring the pressure in the welded area 150b thereafter.

[0051] According to the inspection device 100b of the second embodiment, the bolt 170 and the sleeve 180 serving as the insertion members each include the tapered portions 175 and 185. Therefore, when an operator inserts the bolt 170 and the sleeve 180 into the tube 20 and moves the bolt 170 upward along the axis relative to the sleeve 180, a radial force is generated in the tapered portion 185, and the gap between the inner peripheral surface of the tube 20 and the sleeve 180 can be sealed by the O-ring 189 provided on the outer periphery of the sleeve 180.

[0052] In the second embodiment, the inspection device 100b forms a male thread 172 on the outer periphery of the cylindrical portion 171 of the bolt 170, and forms a female thread 182 on the inner periphery of the cylindrical portion 181 of the sleeve 180. However, it is also possible to form a male thread that is a tapered thread on the outer periphery of the tapered portion 175 of the bolt 170, and form a female thread that is a tapered thread on the inner periphery of the tapered portion 185 of the sleeve 180.

[0053] In the second embodiment, the shell-and-tube type heat exchanger 10 to be inspected is also an example. A user can inspect a structure other than the shell-and-tube type heat exchanger 10 for leaks in the welded portion between the tube and the flange by using the inspection device 100b of the second embodiment, as long as the structure has a welded portion between the tube and the flange.

[0054] The inspection device 100 of the first embodiment and the inspection device 100b of the second embodiment use face seal portions 122, 122b to seal between the caps 120, 120b and the flange surface 14, but an O-ring may be used instead of the face seal portions 122, 122b.

[0055] The inspection device 100 of the first embodiment and the inspection device 100b of the second embodiment use the pressing force generated by screwing the nut 140 to seal between the caps 120, 120b and the flange surface 14, but the caps 120, 120b may also be pressed against the flange surface 14 by using the pressing force of air or a spring to seal.

[0056] In the inspection device 100 of the first embodiment and the inspection device 100b of the second embodiment, the welding areas 150, 150b are subjected to a positive pressure higher than atmospheric pressure during inspection, but may be subjected to a negative pressure lower than atmospheric pressure. If the welding areas 150, 150b are subjected to a negative pressure, when an operator manually presses the caps 120, 122 against the flange surface 14, the negative pressure allows the caps 120, 122 to be tightly attached to the flange surface 14.

[0057] In the first and second embodiments, the worker inspects the welded portion between the flange 11 and the tube 20 for leaks, but this welding may include brazing and soldering. Moreover, the object of inspection is not limited to welding. For example, the object of inspection may be various bonded structures other than welding, such as bonding with a sealant or bonding with an adhesive.

[0058] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0059] 10...shell and tube type heat exchanger, 11...flange, 12...outer edge, 13...hole, 14...flange surface, 15...side, 20...tube, 21...fluid flow path, 22...heat medium flow path, 25...weld, 30...heat medium supply port, 31...heat medium discharge port, 100, 100b...inspection device, 110...clamper, 120...cap, 120b...cap, 121, 121b...cylindrical surface, 122, 122b...face seal portion, 123...communication hole, 124...connector, 126, 126b...circumferential groove, 128, 128b...O-ring, 130...shaft, 132...male thread, 134...connector, 135...Clamper expansion control section, 136...Pump, 137...Clamper valve, 140...Nut, 142...Female thread, 144...Handle, 150, 150b...Welding area, 160...Injection section, 161...Pump, 162...Inspection valve, 163...Residual pressure exhaust valve, 164...Measurement section, 170...Bolt, 171...Cylindrical section, 172...Male thread, 175...Tapered section, 176...End, 178...Handle, 180...Sleeve, 181...Cylindrical section, 182...Female thread, 185...Tapered section, 186...End, 187...Slit, 188...Circumferential groove, 189...O-ring, 200, 202...Pipe

Claims

[Claim 1] An inspection device for inspecting a joint formed by welding a cylindrical workpiece and a flange, comprising: An insert member that is inserted inside the workpiece, held on the inner periphery of the workpiece, and seals the inner periphery of the workpiece; a cap having an inner diameter larger than an outer diameter of the workpiece on a side in contact with the flange, and a seal portion on the outer side of the outer periphery of the workpiece that contacts a flange surface of the flange to seal between the flange and the cap; an injection part that injects gas into a welding area, which is a space surrounded by the cap, the insertion member, the workpiece, and the flange; A measuring unit for measuring a pressure in the welding area; An inspection device comprising:

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