A gas pressure test tool for welding plate heat exchanger pairs for nuclear power

Abstract

The utility model discloses a grouped air pressure test tool for welded plate heat exchanger pairs for nuclear power, including a water collection tank, a lower clamping plate that can be raised and lowered is installed in the water collection tank, and the edge of the lower clamping plate is distributed with clamping positioning parts for clamping the heat exchanger plate pair to be tested, and a reversible upper clamping plate is installed on the rear side of the lower clamping plate through a hinge shaft, and also includes a group of sealing devices 1 and 2 for use in conjunction, and the sealing devices 1 and 2 respectively include sealing blocks, and the sealing blocks are sealed and fitted with the edges of the internal channels of the heat exchanger plate pair to be tested. The utility model realizes the grouped air pressure test of welded plate heat exchanger pairs for nuclear power after laser welding is completed, fills the gap of the sealing pressure test tool for welded plate heat exchanger plates with irregular edges for nuclear power, and realizes the automation degree and operation efficiency of the grouped air pressure test of welded plate heat exchanger pairs for nuclear power.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger plate pair processing production test, in particular to a nuclear power welded plate heat exchanger plate pair grouping air pressure test tool. Background Art

[0002] At present, a welded plate heat exchanger suitable for the cooling of spent fuel pools and heat removal of processing systems in pressurized water reactor nuclear power plants has been widely used. It can replace the original detachable plate heat exchanger with its advantages of high nuclear safety, low failure maintenance rate, no nuclear waste, high pressure and high temperature resistance, and small footprint. The core heat exchange component of this welded plate heat exchanger is the heat exchange core, which is welded by multiple bundles of heat exchange plate pairs, and the heat exchange plate pairs are formed by laser welding of two heat exchange plates.

[0003] In order to ensure the laser weld strength and sealing performance of each group of heat exchange plate pairs before the heat exchange core is assembled and welded, it is necessary to perform an air pressure test on the heat exchanger plate pairs. For example, the patent publication number is: CN 217275755 U, which discloses a universal rapid internal leakage detection device for welded plate heat exchangers, including a water pressure test device, a hydraulic pipe with a gate valve and a pressure gauge is installed at the outlet of the water pressure test device, and the other end of the hydraulic pipe is sealed and passed through the hydraulic pipe holes on the head and tail sections of the rubber sleeve provided in the input pipe flange and is fixed in the rubber sleeve, and the hydraulic pipe extends out of the tail end of the rubber sleeve and enters the heat exchanger flow channel.

[0004] During the test, the patent tests whether the pressure can be maintained after water pressure is injected into one side of the welded plate heat exchanger. However, during the test, the installation position needs to be constantly changed to determine the specific location of the internal leakage defect. This is cumbersome and the test efficiency is low. In addition, the sealing position of the edge of the heat exchanger plate is irregular, which makes it difficult to seal. If the seal is not tight, test errors will occur, and the readiness of the test cannot be ensured. Therefore, this application provides a tooling structure for grouping air pressure tests on welded plate heat exchangers for nuclear power. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects and shortcomings of the prior art and to provide a gas pressure test fixture for grouping plate pairs of welded plate heat exchangers for nuclear power, which can test ten pairs of plates without the need for overall welding of the heat exchange core before the test. If the gas pressure test fails, the laser welded plate pairs can be grouped and processed without the need to process the entire batch of heat exchange cores.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A grouping air pressure test tool for welded plate heat exchanger pairs for nuclear power, including a water collecting trough, a liftable lower clamping plate installed in the water collecting trough, clamping positioning parts for clamping the heat exchanger plate pair to be tested are distributed at the edge of the lower clamping plate, a flippable upper clamping plate is installed on the rear side of the lower clamping plate through a hinge shaft, and also includes a group of sealing devices 1 and 2 used in conjunction, the sealing devices 1 and 2 respectively include sealing blocks, and the sealing blocks are sealed and fitted with the edges of the internal channels of the heat exchanger plate pair to be tested.

[0008] The clamping positioning member comprises a plurality of L-shaped positioning plates, which are installed at intervals on the rear end surface and the corners on both sides of the lower pressing plate.

[0009] The lifting and lowering of the lower clamping plate is driven by hydraulic cylinder lifting devices at both ends. The hydraulic cylinder lifting devices include hydraulic cylinders arranged at both ends of the water collecting trough. The cylinder body of the hydraulic cylinder is supported and fixed by a fixed seat. The extended end of the piston rod of the hydraulic cylinder is connected to the two ends of the lower clamping plate through a pull rod. Guide columns for auxiliary lifting and guiding limits are also installed in the water collecting trough at the rear ends of both sides of the lower clamping plate.

[0010] The flipping of the upper clamping plate is driven by an inclined cylinder stretching device on one side of the upper clamping plate, and the cylinder stretching device includes two inclined and symmetrically arranged cylinders, the protruding ends of the piston rods of the cylinders are hingedly connected to the rear end faces of the upper clamping plate, and the cylinder body ends of the cylinders are mounted and fixed on an inclined fixing frame at the rear, and the inclined fixing frame is fixed at the rear of the water collecting trough, and an upper clamping plate anti-falling pull rod is arranged between the cylinders.

[0011] The front and rear sides of the lower clamping plate are respectively installed with clamping assemblies for clamping the upper and lower clamping plates, and the clamping assemblies include a plurality of pressure plate flip arms hingedly installed at intervals behind the lower clamping plate, and a plurality of tie rod studs hingedly installed in front of the lower clamping plate. The front end face of the upper clamping plate is provided with a tie rod fixing groove corresponding to the tie rod stud.

[0012] The sealing device 1 and the sealing device 2 respectively include a reciprocating fixed seat 2 and a sealing block. The fixed seat 2 is installed on the lower clamping plate through fixed guide bolts on both sides of the rear end face. The fixed guide bolts are installed on the fixed seat 2 through a linear bearing flange. A sealing block is installed on the front end face of the fixed seat 2. A sealing rubber pad is arranged on the sealing block. The screw rod is installed on the fixed seat 2 through a thrust bearing flange. The rear end of the screw rod is provided with a handle for convenient operation.

[0013] An inflation pipe for inflating the heat exchanger plate pair to be tested is installed on the fixing seat 2 of the sealing device 2, an air inlet valve and a pressure gauge are installed on the inflation pipe, a ventilation flow channel connected to the inflation pipe is provided in the sealing block, and a groove is provided on the inflation port position on the sealing rubber pad.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model facilitates the taking and placing of the heat exchanger plate pairs before and after the test by means of the structure of the lower pressing plate that can be lifted and lowered and the structure of the upper pressing plate that can be flipped, and at the same time improves the operating efficiency of the opening and closing of the pressing plate and the lifting and lowering of the whole machine in the water tank;

[0016] Through the structure of sealing device 1 and sealing device 2, the sealing block can be completely fitted with the irregular edge of the plate. At the same time, the fitting accuracy between the sealing block and the plate edge is controlled by the screw and linear bearing propulsion device to ensure the sealing performance of the plate edge during the air pressure test and avoid the test error caused by loose sealing.

[0017] In summary, the utility model realizes the grouped air pressure test of the welded plate heat exchanger plate pairs for nuclear power after laser welding is completed, fills the gap in the sealing pressure test tooling for the irregular edge shape of the welded plate heat exchanger plate for nuclear power, realizes the automation degree and operation efficiency of the grouped air pressure test of the welded plate heat exchanger plate pairs for nuclear power, and the tooling structure and material meet the technical requirements for the cleanliness of nuclear-grade product plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 is a schematic diagram of the structure of the heat exchanger plate pair to be tested;

[0020] Figure 3 Schematic diagram of the structure of the upper pressing plate;

[0021] Figure 4 A schematic diagram of the structure of the lower pressing plate, the upper pressing plate turning axis and the tilting fixing frame;

[0022] Figure 5 for Figure 4 A top view of

[0023] Figure 6 is a structural schematic diagram of a sealing device 1;

[0024] Figure 7 It is a structural schematic diagram of the sealing device from another perspective;

[0025] Figure 8 is a structural schematic diagram of the sealing device 2;

[0026] Fig. 9 is a structural schematic diagram of the sealing device 2 from another perspective;

[0027] Fig.10It is a structural schematic diagram of the pressure plate flip arm;

[0028] Fig.11 It is a structural schematic diagram of the water collecting tank and the hydraulic cylinder lifting device.

[0029] Reference numerals:

[0030] 1. Water collecting trough; 2. Lower clamping plate; 3. Clamping locating piece; 4. Heat exchanger plate pair to be tested; 5. Upper clamping plate; 6. Sealing device 1; 7. Sealing device 2; 8. Hydraulic cylinder; 9. Fixing seat 1; 10. Pull rod; 11. Guide column; 12. Cylinder; 13. Tilt fixing frame; 14. Upper clamping plate anti-fall pull rod; 15. Pressing plate flip arm; 16. Pull rod stud; 17. Pull rod fixing groove; 21. Sealing block; 22. Fixing seat 2; 23. Screw rod; 24. Sealing rubber pad; 25. Handle; 26. Inflating pipe; 27. Inlet valve; 28. Pressure gauge; 29. ​​Slot; 30. Fixing guide bolt; 31. Linear bearing flange; 32. Thrust bearing flange DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See attached Figure 1-11 ;

[0033] A nuclear power welded plate heat exchanger plate pair grouping air pressure test tool, including a water collection tank 1, a liftable lower clamping plate 2 is installed in the water collection tank 1, and the edge of the lower clamping plate 2 is distributed with a clamping positioning piece 3 for clamping the heat exchanger plate pair 4 to be tested. The clamping positioning piece 3 includes a plurality of L-shaped positioning plates, which are installed at intervals on the rear end surface and the corners on both sides of the lower clamping plate 2. A flippable upper clamping plate 5 is installed on one side of the lower clamping plate 2 through a hinge shaft. It also includes a group of sealing devices 1 6 and sealing devices 2 7 used in conjunction with each other. The sealing devices 1 6 and the sealing devices 2 7 respectively include sealing blocks 21, and the sealing blocks 21 are sealed and fitted with the edges of the internal channels of the heat exchanger plate pair 4 to be tested.

[0034] Furthermore, the lifting of the lower clamping plate 2 is driven by the hydraulic cylinder lifting device at both ends. The hydraulic cylinder lifting device includes a hydraulic cylinder 8 arranged at both ends of the water collecting tank 1. The cylinder body of the hydraulic cylinder 8 is supported and fixed by a fixing seat 9. The extended end of the piston rod of the hydraulic cylinder 8 is connected to the two ends of the lower clamping plate 2 through a pull rod 10. The water collecting tank 1 is also equipped with guide pillars 11 located at the rear ends of both sides of the lower clamping plate 2 to assist in lifting and guiding the limit. The flipping of the upper clamping plate 5 is driven by the cylinder stretching device arranged obliquely on one side thereof. The cylinder stretching device includes two obliquely symmetrically arranged cylinders 12. The extended end of the piston rod of the cylinder 12 is hingedly connected to the rear end surface of the upper clamping plate 5. The cylinder body end of the cylinder 12 is fixed on the rear inclined fixing frame 13. The inclined fixing frame 13 is fixed to the rear of the water collecting tank 1. An upper clamping plate anti-falling pull rod 14 is arranged between the cylinders 12.

[0035] Furthermore, the outer structure of the upper clamping plate and the lower clamping plate is the same as the outer structure of the heat exchanger plate pair to be tested. The front and rear sides of the lower clamping plate 2 are respectively installed with clamping assemblies for clamping the upper and lower clamping plates. The clamping assemblies include a plurality of clamping plate flip arms 15 hingedly installed at intervals behind the lower clamping plate, and a plurality of tie rod studs 16 hingedly installed in front of the lower clamping plate. The front end surface of the upper clamping plate 5 is provided with a tie rod fixing groove 17 corresponding to the tie rod studs 16. The pressure plate flip arm 15 is installed on the hinge shaft behind the lower clamping plate through a connecting frame, and a screw sleeve is provided on it, in which a screw rod is installed, and a screw handle is installed at the end of the screw rod. A pressure plate for fitting the screw rod is installed on the edge of the upper clamping plate, and the height of the upper clamping plate can be fine-tuned by rotating the screw handle; the bottom end of the pull rod stud 16 is hingedly installed on one side of the lower clamping plate through a hinge rod, and a screw nut handle is provided on the top of the pull rod stud 16. Rotate the pull rod stud 16 to make it snap into the pull rod fixing groove, and rotate the nut handle on the top of the pull rod stud to clamp and fix the upper clamping plate.

[0036] Further, if Figure 6-9 As shown: the sealing device 1 6 and the sealing device 2 7 respectively include a reciprocating fixed seat 22 and a sealing block 21, the fixed guide bolt 30 is installed on the fixed seat 22 through a linear bearing flange 31, the fixed seat 22 is fixedly installed on the lower clamping plate 2 through the fixed guide bolts 30 on both sides of the rear end face, the front end face of the fixed seat 22 is respectively installed with a sealing block 21, the sealing block 21 is provided with a sealing rubber pad 24, the screw rod 23 is installed on the fixed seat 22 through a thrust bearing flange 32, and the rear end of the screw rod 23 is provided with a handle 25 for convenient operation. The fixed seat 22 of the sealing device 2 7 is installed with an inflation pipe 26 for inflating the heat exchanger plate pair to be tested, the inflation pipe 26 is installed with an air inlet valve 27 and a pressure gauge 28, the sealing block 21 is provided with a ventilation flow channel connected to the inflation pipe, and the inflation port position on the sealing rubber pad 24 is provided with a slot 29 to ensure sealing without affecting the test inflation.

[0037] Before conducting the gas pressure test on the plate pairs of welded plate heat exchangers for nuclear power, operate the hydraulic cylinder lifting device (such as Fig.11 ), pressurize the hydraulic cylinder to extend the cylinder rod, lift the air pressure test fixture, and send water to the water collection tank (such as Fig.11 ) is injected with a certain level of softened water for nuclear power.

[0038] The specific process of the test is:

[0039] (1) Place the ten pairs of heat exchanger plates to be tested (such as Figure 2 ) on the lower clamping plate 2 ( Figure 4 ) on the upper surface, an L-shaped limiting plate 3 is used for positioning and stabilization.

[0040] (2). Operate the cylinder stretching device ( Figure 1 As shown), pressurize the cylinder 12 to extend the cylinder rod, so that the upper clamping plate 5 ( Figure 3 ) and adjust the pressure plate flip arm 15 ( Figure 7 ) middle screw, level the upper clamping plate 5 until it fits perfectly with the top plate. Figure 4 ) The tie rod stud 16 is placed in the upper clamping plate 5 ( Figure 3 ) In the pull rod groove 17, rotate the pull rod nut 16 to clamp the upper and lower pressure plates.

[0041] (3) Operate the sealing device 1 6 and the sealing device 2 7 respectively, rotate the advancing screw 23, and fix the guide bolt 30 to make the sealing gasket 24 of the sealing block 21 fit tightly with the opposite edge of the plate with the linear bearing as the guide.

[0042] (4) Operate the hydraulic cylinder lifting device to release the pressure in the hydraulic cylinder to lower the air pressure test tooling.

[0043] (5) Open the air inlet valve 27 of the second sealing device to inflate the plate pair bundle. When the pressure on the pressure gauge 28 reaches the test pressure, close the air inlet valve to maintain the pressure. During the pressure maintenance period, check whether there are bubbles at the laser weld around the plate pair. If there are no bubbles, it proves that the laser weld of the plate pair meets the welding requirements.

[0044] (6) After the air pressure test, open the air inlet valve to release the pressure; operate the hydraulic cylinder lifting device ( Fig.11 As shown), pressurize the hydraulic cylinder to extend the cylinder rod and lift the air pressure test fixture out of the water; loosen the lower clamping plate ( Figure 4 ) tie rod nut; then operate the cylinder stretching device, the cylinder pressure is released to retract the cylinder rod, and the upper clamping plate ( Figure 3 )Open;

[0045] Finally, turn and loosen the screw rod and the lower clamping plate of the sealing device 1 and the sealing device 2 ( Figure 4 ) Pull rod nut and take out the pressure test plate pair.

[0046] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0047] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A gas pressure test tool for plate pairs of welded plate heat exchangers for nuclear power, characterized in that: The invention comprises a water collecting trough (1), wherein a lower pressing plate (2) which can be raised and lowered is installed in the water collecting trough (1), and a clamping positioning piece (3) for clamping a heat exchanger plate pair (4) to be tested is distributed at the edge of the lower pressing plate (2), and a flippable upper pressing plate (5) is installed on the rear side of the lower pressing plate (2) via a hinge shaft, and further comprises a set of sealing devices 1 (6) and 2 (7) for use together, wherein the sealing devices 1 (6) and 2 (7) respectively comprise sealing blocks (21), and the sealing blocks (21) are sealed and fitted with the edges of the internal channels of the heat exchanger plate pair (4) to be tested.

2. The gas pressure test fixture for plate pair groups of welded plate heat exchangers for nuclear power according to claim 1, characterized in that: The clamping positioning member (3) comprises a plurality of L-shaped positioning plates, which are installed at intervals on the rear end surface and the corners on both sides of the lower pressing plate (2).

3. The gas pressure test fixture for plate pair groups of welded plate heat exchangers for nuclear power according to claim 1, characterized in that: The lifting of the lower clamping plate (2) is driven by hydraulic cylinder lifting devices at both ends, and the hydraulic cylinder lifting devices include hydraulic cylinders (8) arranged at both ends of the water collecting trough (1). The cylinder body of the hydraulic cylinder (8) is supported and fixed by a fixing seat (9), and the extended end of the piston rod of the hydraulic cylinder (8) is connected to the two ends of the lower clamping plate (2) through a pull rod (10). The water collecting trough (1) is also equipped with guide columns (11) located at the rear ends of both sides of the lower clamping plate (2) to assist in lifting and guiding.

4. The gas pressure test fixture for plate pair groups of welded plate heat exchangers for nuclear power according to claim 1, characterized in that: The turning of the upper clamping plate (5) is driven by an inclined cylinder stretching device on one side thereof, wherein the cylinder stretching device comprises two inclined and symmetrically arranged cylinders (12), the piston rod protruding ends of the cylinders (12) are hingedly connected to the rear end surface of the upper clamping plate (5), the cylinder body end of the cylinder (12) is mounted and fixed on an inclined fixing frame (13) at the rear, and the inclined fixing frame (13) is fixed at the rear of the water collecting tank (1), and an upper clamping plate anti-falling pull rod (14) is arranged between the cylinders (12).

5. The gas pressure test fixture for plate pair groups of welded plate heat exchangers for nuclear power according to claim 1, characterized in that: The front and rear sides of the lower clamping plate (2) are respectively provided with clamping assemblies for clamping the upper and lower clamping plates, and the clamping assemblies include a plurality of clamping plate flip arms (15) hingedly installed at intervals behind the lower clamping plate, and a plurality of tie rod studs (16) hingedly installed in front of the lower clamping plate, and the front end face of the upper clamping plate (5) is provided with a tie rod fixing groove (17) corresponding to the tie rod studs (16).

6. The gas pressure test fixture for plate pair groups of welded plate heat exchangers for nuclear power according to claim 1, characterized in that: The sealing device 1 (6) and the sealing device 2 (7) respectively include a reciprocating fixed seat 2 (22) and a sealing block (21); the fixed seat 2 (22) is mounted on the lower clamping plate (2) via fixed guide bolts (30) on both sides of the rear end face; the fixed guide bolts (30) are mounted on the fixed seat 2 (22) via a linear bearing flange (31); a sealing block (21) is mounted on the front end face of the fixed seat 2 (22); a sealing rubber pad (24) is arranged on the sealing block (21); a screw rod (23) is mounted on the fixed seat 2 (22) via a thrust bearing flange (32); and a handle (25) for convenient operation is arranged at the rear end of the screw rod (23).

7. The gas pressure test fixture for plate pair groups of welded plate heat exchangers for nuclear power according to claim 6, characterized in that: An air charging pipe (26) for charging the heat exchanger plate pair to be tested is installed on the second fixing seat (22) of the second sealing device (7), an air inlet valve (27) and an air pressure gauge (28) are installed on the air charging pipe (26), a ventilation flow channel connected to the air charging pipe is provided in the sealing block (21), and a slot (29) is provided at the air charging port position on the sealing rubber pad (24).

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