Heat exchange tube pressure testing device

Abstract

The utility model relates to a heat exchange tube pressure testing device, which comprises a clamping device for clamping a heat exchange tube, the clamping device comprises two baffle blocks which are oppositely arranged and can adjust the relative distance, the middle parts of the two baffle blocks are respectively provided with a first positioning hole along the horizontal direction in a penetrating manner, and the back surfaces of the two baffle blocks, which are far away from each other, are respectively and fixedly connected with a baffle plate; second positioning holes coaxial with the first positioning holes are formed in the two baffles respectively in a penetrating mode, the hole diameter of the first positioning holes is larger than that of the second positioning holes, the two ends of the heat exchange pipe are embedded into the two opposite first positioning holes respectively and communicate with the pressurizing device in a sealed mode, and the pressurizing device provides high pressure for an inner cavity of the heat exchange pipe. According to the device, the two ends of the heat exchange tube are embedded into the positioning holes for fixing, and the sealing devices are additionally arranged at the two ends of the heat exchange tube, so that the end parts of the heat exchange tube can be prevented from being damaged, the sealing performance can be ensured, and nondestructive testing of the pressure test of the heat exchange tube is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power generation equipment, in particular to a heat exchange tube pressure testing device. Background Art

[0002] There are various forms of heat exchange tubes in the heat exchanger of the pressure vessel. Some heat exchange tubes are straight tubes, some are U-shaped tubes, and some are serpentine tubes. For U-shaped tubes and serpentine tubes, the straight tubes need to be bent at a certain angle according to the use requirements before assembly. In order to ensure that there is no leakage after the heat exchange tube is manufactured, it is necessary to carry out a pressure test according to the requirements of the drawing before assembly. The current practice for the pressure test of heat exchange tubes is to reserve a certain length at the end of each tube during procurement. After the heat exchange tube is bent, the two ends are welded to the pressure test tooling and then cut off after the pressure test is passed. The disadvantages of the above method are: first, due to the reservation of a part of the length, the procurement cost is increased; second, welding increases the manufacturing cost and takes more manufacturing time. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a heat exchange tube pressure testing device to solve the problem that the length margin needs to be increased during the pressure test of the heat exchange tube and welding work is required for fixing before the pressure test.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A heat exchange tube pressure testing device includes a clamping device for clamping the heat exchange tube, the clamping device includes two blocks that are arranged opposite to each other and can adjust the relative distance between them, the middle parts of the two blocks are respectively penetrated by a first positioning hole in the horizontal direction, the back sides of the two blocks that are separated from each other are respectively fixedly connected to a baffle, and the two baffles are respectively penetrated by a second positioning hole coaxially with the first positioning hole, the aperture of the first positioning hole is larger than that of the second positioning hole, the two ends of the heat exchange tube are respectively embedded in the two opposite first positioning holes, the two ends of the heat exchange tube are respectively connected to a pressurizing device in a sealed manner, and the pressurizing device provides high pressure to the inner cavity of the heat exchange tube.

[0006] As a preferred embodiment, the clamping device also includes two opposite first brackets and a second bracket, wherein the bottom of one group of connected baffles and blocks is fixed to the top of the first bracket, and the bottom of another group of baffles and blocks can be slid along the axial direction of the heat exchange tube and is arranged in the middle of the top of the second bracket. A positioning block and a fixed baffle are fixed on the top of the second bracket near the two side edges along the axial direction of the heat exchange tube. The positioning block is arranged on a side close to the first bracket, and the fixed baffle is arranged on a side away from the first bracket. A threaded hole is horizontally penetrated through the upper part of the fixed baffle, and an adjusting bolt passes through the threaded hole and abuts against the adjacent baffle to tightly connect the baffle and the baffle to the heat exchange tube.

[0007] As a preferred implementation scheme, protective sleeves are respectively attached to the inner circumferences of the two opposite first positioning holes, and the two protective sleeves are vertically contracted and extended around the second positioning holes at one end close to their respective baffles. The two ends of the heat exchange tube are respectively inserted into the protective sleeves, and the two circumferential end surfaces of the heat exchange tube abut against the protective sleeves around the second positioning holes. A high-strength core is inserted into the two ends of the heat exchange tube, and a through hole is provided on the horizontal axis of the high-strength core coaxial with the heat exchange tube. The outer ends of the high-strength cores on both sides are respectively extended into the second positioning holes, and high-pressure resistant rubber is arranged between the middle part of the outer circumference of the high-strength core and the inner wall of the heat exchange tube.

[0008] As a preferred embodiment, the pressurizing device includes a water tank, one side of the water tank is connected to a water inlet, a pressurizing pump is arranged on the top of the water tank, and two ports of the pressurizing pump are respectively connected to the high-strength core on both sides of the clamping device through high-pressure hoses to form a loop.

[0009] As a preferred embodiment, a pressure relief valve and a pressure gauge are provided on the path of the pressure pump close to one end of the first bracket.

[0010] As a preferred embodiment, the high-strength core on the first bracket is connected to a high-pressure hose via a high-pressure water connector.

[0011] The beneficial effects of the utility model are as follows: the clamping device is used to fix the heat exchange tube. For heat exchange tubes of the same size, only one device is needed to solve the problem of pressure resistance test of all heat exchange tubes, saving the welding allowance and welding process for fixing each heat exchange tube. For heat exchange tubes of different specifications, the pressure resistance test can be achieved by replacing the high-strength core and protective cover and other components in the device. Because the device adopts the positioning hole to embed the two ends of the heat exchange tube for fixing, adding sealing devices on both ends of the heat exchange tube can not only ensure that the ends of the heat exchange tube are not damaged, but also ensure the sealing, and realize the non-destructive detection of the pressure test of the heat exchange tube. The use of this device does not require welding when the two ends of the heat exchange tube are pressure tested, has universality, saves the cost of pressure resistance test, and for heat exchange tubes of different specifications, only the corresponding structure of the two ends of the heat exchange tube needs to be replaced, saving the cost of manufacturing tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a partial enlarged view of the utility model;

[0015] Figure 3 This is a partial enlarged view of the utility model without the heat exchange tube installed;

[0016] Figure 1-Figure 3 Explanation of the reference numerals in the accompanying drawings: 1. high-pressure hose; 2. first bracket; 21. second bracket; 3. high-pressure water joint; 4. high-strength core; 5. high-pressure resistant rubber; 6. baffle; 7. block; 8. protective cover; 9. heat exchange tube; 10. positioning block; 11. fixed baffle; 12. adjusting bolt; 13. pressure pump; 14. water inlet; 15. water tank; 16. pressure gauge; 17. pressure relief valve; 61. second positioning hole; 71. first positioning hole. DETAILED DESCRIPTION

[0017] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1-Figure 3 The heat exchange tube pressure testing device shown in the figure includes a clamping device for clamping the heat exchange tube 9, the clamping device includes two blocks 7 that are arranged opposite to each other and can adjust the relative distance between them, the middle parts of the two blocks 7 are respectively penetrated with first positioning holes 71 in the horizontal direction, the back sides of the two blocks 7 that are far away from each other are respectively fixedly connected to a baffle 6, and the two baffles 6 are respectively penetrated with second positioning holes 61 coaxially with the first positioning holes 71, the aperture of the first positioning hole 71 is larger than the second positioning hole 61, the two ends of the heat exchange tube 9 are respectively embedded in the two opposite first positioning holes 71, the two ends of the heat exchange tube 9 are respectively embedded in the two opposite first positioning holes 71, the two ends of the heat exchange tube 9 are sealed and connected with the pressurizing device, and the pressurizing device provides high pressure to the inner cavity of the heat exchange tube 9.

[0019] Specifically, the two ends of the heat exchange tube 9 are placed in two opposite first positioning holes 71 on the clamping device to fix the heat exchange tube 9. Sealing structures are provided at both ends of the heat exchange tube 9. The pressurizing device fills the heat exchange tube 9 with liquid to fill the inside of the heat exchange tube 9 with high pressure. The welds of the heat exchange tube 9 are inspected to see if there is any damage and whether the welding is firm. The distance between the two blocks 7 can be adjusted to detect heat exchange tubes 9 of different lengths.

[0020] like Figure 1The clamping device also includes two opposite first brackets 2 and second brackets 21, wherein the bottom of one group of connected baffles 6 and stoppers 7 is fixed on the top of the first bracket 2, and the bottom of another group of baffles 6 and stoppers 7 can be slidably arranged in the middle of the top of the second bracket 21 along the axial direction of the heat exchange tube 9. A positioning block 10 and a fixed baffle 11 are fixed on the top of the second bracket 21 near the edges on both sides along the axial direction of the heat exchange tube 9. The positioning block 10 is arranged on the side close to the first bracket 2, and the fixed baffle 11 is arranged on the side away from the first bracket 2. A threaded hole is horizontally penetrated through the upper part of the fixed baffle 11, and an adjusting bolt 12 passes through the threaded hole and abuts against the adjacent baffle 6, so that the baffle 6 and the stopper 7 are tightly connected to the heat exchange tube 9. The distance between the first bracket 2 and the second bracket 21 is adjusted according to the heat exchange tube 9, and the distance between the two first positioning holes 71 is adjusted to adapt to the length of different heat exchange tubes 9. One group of baffles 6 and stoppers 7 can move along the axial direction of the heat exchange tube 9 to adjust the distance, which is convenient for the installation and removal of the heat exchange tube 9.

[0021] like Figure 2 and Figure 3 , protective sleeves 8 are attached to the inner circumferences of the two opposite first positioning holes 71, and the ends of the two protective sleeves 8 close to their respective baffles 6 are vertically contracted and extended around the second positioning hole 61. The two ends of the heat exchange tube 9 are respectively inserted into the protective sleeves 8, and the two circumferential end faces of the heat exchange tube 9 abut against the protective sleeves 8 around the second positioning hole 61. The high-strength core 4 is inserted into the two ends of the heat exchange tube 9. A through hole is opened on the horizontal axis of the high-strength core 4 coaxially with the heat exchange tube 9. The outer ends of the high-strength core 4 on both sides extend into the second positioning hole 61 respectively, and a high-pressure resistant rubber 5 is arranged between the middle of the outer circumference of the high-strength core 4 and the inner wall of the heat exchange tube 9. Through the high-strength core 4 inside the two ends of the heat exchange tube 9 and the protective sleeve 8 outside, the pressurizing device is sealed and connected to the heat exchange tube 9, which can ensure the pressure inside the heat exchange tube 9.

[0022] like Figure 1 The pressurizing device includes a water storage tank 15, one side of the water storage tank 15 is connected to a water inlet 14, and a pressurizing pump 13 is arranged on the top of the water storage tank 15. The two ports of the pressurizing pump 13 are respectively connected to the high-strength core 4 on both sides of the clamping device through a high-pressure hose 1 to form a loop. The pressurizing pump 13 injects the water in the water storage tank 15 into the heat exchange tube 9 and can maintain a certain pressure to pressurize the inside of the heat exchange tube 9 to detect the sealing degree of the weld.

[0023] A pressure relief valve 17 and a pressure gauge 16 are provided on the path of the pressure pump 13 close to one end of the first bracket 2. The pressure gauge 16 detects the applied pressure, and the pressure relief valve 17 releases the pressure.

[0024] In addition, the high-strength core 4 on the first bracket 2 is connected to the high-pressure hose 1 through a high-pressure water connector 3. The high-pressure water connector 3 has a strong bearing capacity and is easy to disassemble.

[0025] The working process of the utility model is as follows:

[0026] According to the diagram 1- Figure 3 , weld two groups of baffles 6 and blocks 7 separately, and one group of baffles 6 and blocks 7 are welded to the first bracket 2 as an inseparable whole. The positioning block 10 and the fixed baffle 11 are welded to the second bracket 21 as an inseparable whole, and the other group of baffles 6 and blocks 7 welded together do not need to be welded to the second bracket 21. The top surface of the second bracket 21 between the fixed baffle 11 and the positioning block 10 needs to be processed smoothly to ensure that the baffle 6 and the block 7 can slide freely. During the pressure test, adjust the distance between the first bracket 2 and the second bracket 21 according to the length of the heat exchange tube 9. During the pressure test, ensure that the length of the heat exchange tube 9 is equal to the distance between the two baffles 6. First, Figure 1 The left protective sleeve 8 and the high-strength core 4 are installed into the first positioning hole 71, and then one end of a high-pressure hose 1 is connected to the pressure pump 13, and the other end of the high-pressure hose 1 is connected to the high-strength core 4 using a high-pressure water connector 3. Figure 1 The protective sleeve 8 and high-strength core 4 on the right end are installed into the first positioning hole 71 on the right side, and then one end of another high-pressure water joint 3 is connected to the other end of the booster pump 13, and the other end of the high-pressure hose 1 is connected to the high-strength core 4 on the right side using the high-pressure water joint 3. After the preliminary preparations are completed, the left end of the heat exchange tube 9 is inserted into the corresponding high-strength core 4, and the right end is inserted into the corresponding high-strength core 4. The baffle 6 and the block 7 on the top of the second bracket 21 are moved to ensure that there is no gap between the heat exchange tube 9 and the baffles 6 at both ends, and the baffle 6 is tightened with the adjusting bolt 12. Start the booster pump 13 to inject liquid into the heat exchange tube 9 to pressurize it. After reaching the test pressure, close the valve, maintain the pressure according to the process requirements, observe that there is no leakage, open the pressure relief valve 17 to relieve the pressure, and complete the pressure test of the heat exchange tube 9.

[0027] The above embodiments are only illustrative of the principles and effects of the invention of the utility model, as well as some embodiments of its application, and are not intended to limit the invention of the utility model. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A heat exchange tube pressure testing device, characterized in that: The invention comprises a clamping device for clamping a heat exchange tube (9), the clamping device comprising two blocks (7) arranged opposite to each other and having an adjustable relative distance therebetween, the middle parts of the two blocks (7) respectively penetrated with a first positioning hole (71) in a horizontal direction, the back sides of the two blocks (7) which are separated from each other are respectively fixedly connected to a baffle (6), the two baffles (6) respectively penetrated with a second positioning hole (61) coaxially with the first positioning hole (71), the aperture of the first positioning hole (71) is larger than that of the second positioning hole (61), the two ends of the heat exchange tube (9) are respectively embedded in the two opposite first positioning holes (71), the two ends of the heat exchange tube (9) are sealed and connected with a pressurizing device, and the pressurizing device provides high pressure to the inner cavity of the heat exchange tube (9).

2. The heat exchange tube pressure testing device according to claim 1, characterized in that: The clamping device further comprises two opposing first brackets (2) and second brackets (21), wherein the bottom of one group of connected baffles (6) and stoppers (7) is fixed to the top of the first bracket (2), and the bottom of another group of baffles (6) and stoppers (7) is slidably arranged in the middle of the top of the second bracket (21) along the axial direction of the heat exchange tube (9). A positioning block (10) and a fixed baffle (11) are fixed to the top of the second bracket (21) near the two side edges along the axial direction of the heat exchange tube (9). The positioning block (10) is arranged on a side close to the first bracket (2), and the fixed baffle (11) is arranged on a side away from the first bracket (2). A threaded hole is horizontally penetrated through the upper part of the fixed baffle (11), and an adjusting bolt (12) passes through the threaded hole and abuts against the adjacent baffle (6), thereby tightly connecting the baffle (6) and the stopper (7) to the heat exchange tube (9).

3. The heat exchange tube pressure testing device according to claim 1, characterized in that: Protective sleeves (8) are respectively attached to the inner circumferences of the two opposite first positioning holes (71); one end of the two protective sleeves (8) close to the respective baffles (6) is vertically contracted and extended around the second positioning hole (61); the two ends of the heat exchange tube (9) are respectively inserted into the protective sleeves (8); the two circumferential end surfaces of the heat exchange tube (9) abut against the protective sleeves (8) around the second positioning hole (61); a high-strength core (4) is inserted into the interior of the two ends of the heat exchange tube (9); a through hole is coaxially provided on the horizontal axis of the high-strength core (4) and the heat exchange tube (9); the outer ends of the high-strength core (4) on both sides extend into the second positioning hole (61) respectively; and a high-pressure resistant rubber (5) is provided between the middle of the outer circumference of the high-strength core (4) and the inner wall of the heat exchange tube (9).

4. The heat exchange tube pressure testing device according to claim 1, characterized in that: The pressurizing device comprises a water storage tank (15), one side of the water storage tank (15) is connected to a water inlet (14), a pressurizing pump (13) is arranged on the top of the water storage tank (15), and two ports of the pressurizing pump (13) are respectively connected to the high-strength core (4) on both sides of the clamping device through high-pressure hoses (1) to form a loop.

5. The heat exchange tube pressure testing device according to claim 4, characterized in that: A pressure relief valve (17) and a pressure gauge (16) are provided on a path of the pressure pump (13) close to one end of the first bracket (2).

6. The heat exchange tube pressure testing device according to claim 2, characterized in that: The high-strength core (4) on the first bracket (2) is connected to the high-pressure hose (1) via a high-pressure water joint (3).

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