A heat exchanger tube leak inspection device

Abstract

The utility model discloses heat exchange tube leak point inspection device of heat exchanger, include: front fixed baffle, front jack, front water injection cylinder, rear fixed baffle, rear jack, rear flange block, the structure of front water injection cylinder includes: cylinder pipe, tail cover, front flange block, tail cover welds and closed the back end of cylinder pipe, and the front end of cylinder pipe is welded and closed by front flange block, and the water inlet and pressure detection mouth are seted up on the cylinder pipe, and the water inlet is welded with the connecting pipe, and the flange is welded on the connecting pipe port, and the internal thread is processed in the pressure detection mouth, and the pressure gauge detection unit is detachable and is connected in the pressure detection mouth, and the front end face of front flange block is processed with the butt joint recess, and the through -hole is still processed on the front flange block, the front end face of rear flange block is also processed with the butt joint recess, and the annular sealing gasket is arranged in the two butt joint recesses. Heat exchange tube leak point inspection device can check the heat exchange tube in heat exchanger gradually.

Description

Technical Field

[0001] This utility model relates to the field of pressure vessel manufacturing and processing, specifically to a heat exchanger tube leak detection device. Background Technology

[0002] As chemical plants become increasingly large-scale, heat exchangers are also becoming larger, resulting in a greater number and length of heat exchange tubes. During heat exchanger manufacturing, the heat exchange tube bundles need to be prefabricated. Due to their length and weight, if not properly controlled during manufacturing, the heat exchange tubes are prone to deformation and damage during hoisting and transportation. This can lead to media leakage during equipment operation, creating safety hazards and causing greater economic losses due to plant shutdowns. Furthermore, after the heat exchange tubes are welded to the tube sheet assembly, the outward extension length of the heat exchange tubes is no more than 5mm, making existing leak detection devices designed for inspecting individual heat exchange tubes ineffective for inspecting heat exchanger tubes throughout the entire system. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a heat exchanger tube leak detection device that can inspect each heat exchanger tube in the heat exchanger one by one.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a heat exchanger tube leak detection device, characterized in that it includes: a front fixed baffle, a front jack, a front water injection cylinder, a rear fixed baffle, a rear jack, and a rear flange block. Both the front and rear fixed baffles are used for fixing and supporting the jack. The front jack is used to push the front water injection cylinder, and the rear jack is used to push the rear flange block. The structure of the front water injection cylinder includes: a cylinder tube, a tail cap, and a front flange block. The tail cap is welded to seal the rear end of the cylinder tube, and the front flange block is welded to seal the cylinder tube. At the front end, a water inlet and a pressure detection port are provided on the tube. A connecting pipe is welded to the water inlet, and a flange is welded to the port of the connecting pipe. An internal thread is machined in the pressure detection port. The pressure gauge detection unit is detachably threaded and connected to the pressure detection port. A mating groove for inserting the heat exchange tube port is machined on the front end face of the front flange block. A through hole is also machined on the front flange block to connect the mating groove on it with the inner cavity of the tube. A mating groove for inserting the heat exchange tube port is also machined on the front end face of the rear flange block. An annular sealing gasket is provided in both mating grooves.

[0005] Furthermore, in the aforementioned heat exchanger tube leak detection device, the rear end of the front jack is fixed to the front fixed baffle, and the rear end of the rear jack is fixed to the rear fixed baffle.

[0006] Furthermore, in the aforementioned heat exchanger tube leak detection device, the annular sealing gasket is a flexible graphite gasket.

[0007] Furthermore, in the aforementioned heat exchanger tube leak detection device, the port of the mating groove is beveled with a guide bevel.

[0008] Furthermore, in the aforementioned heat exchanger tube leak detection device, the inner diameter of the mating groove is 2mm larger than the outer diameter of the heat exchanger tube.

[0009] The advantages of this utility model are: the heat exchange tube leak detection device is flexible and convenient, uses less material, and can save manufacturing costs. If a leak occurs during the pressure test of the heat exchanger, the heat exchange tube leak detection device can be used to perform a water pressure test on each heat exchange tube in the heat exchanger according to the approximate location of the leak point, thereby determining which heat exchange tube is leaking. Attached Figure Description

[0010] Figure 1 This is a schematic diagram showing the installation of the front fixed baffle, front jack, and front water injection cylinder in the heat exchanger tube leak detection device.

[0011] Figure 2 This is a schematic diagram of the installation of the rear fixed baffle, rear jack, and rear flange block in the heat exchanger tube leak detection device. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0013] like Figure 1 , Figure 2 As shown, a heat exchanger tube leak detection device includes: a front fixed baffle 1, a front jack 2, a front water injection cylinder 3, a rear fixed baffle 4, a rear jack 5, and a rear flange block 6. The front fixed baffle 1 and the rear fixed baffle 4 are used for fixing and supporting the jacks. The front jack 2 is used to push the front water injection cylinder 3, and the rear jack 5 is used to push the rear flange block 6. The front water injection cylinder 3 includes: a cylinder 7, a tail cap 8, and a front flange block 9. The tail cap 8 is welded to and seals the rear end of the cylinder 7, and the front flange block 9 is welded to and seals the front end of the cylinder 7. An inlet and a outlet are provided on the cylinder 7. The pressure testing port has a connecting pipe 10 welded to the inlet, and a flange welded to the port of the connecting pipe 10. The pressure testing port has internal threads. The pressure gauge testing unit 11 is detachably threaded and connected to the pressure testing port. The front flange block 9 has a mating groove 12 for the heat exchange tube 14 to be inserted into on its front end face. The front flange block 9 also has a through hole 13 that allows the mating groove 12 to communicate with the inner cavity of the cylinder 7. The rear flange block 6 also has a mating groove 12 for the heat exchange tube 14 to be inserted into on its front end face. Both mating grooves 12 are provided with annular sealing gaskets.

[0014] In this embodiment, the rear end of the front jack 2 is fixed to the front fixed baffle 1, and the rear end of the rear jack 5 is fixed to the rear fixed baffle 4. This arrangement makes installation and inspection more convenient. The annular sealing gasket is a flexible graphite gasket, which has better sealing performance and is more durable. The port of the mating groove 12 has a chamfered guide angle, which facilitates the insertion of the heat exchange tube into the mating groove 12. The inner diameter of the mating groove 12 is 2mm larger than the outer diameter of the heat exchange tube.

[0015] During inspection, the front fixed baffle 1 and the rear fixed baffle 4 are respectively fixed to the outer sides of the front and rear ends of the heat exchange tube assembly in the heat exchanger. The front water injection cylinder 3 is placed between the front jack 2 and the front end of the heat exchange tube 14 to be tested. The rear flange block 6 is placed between the rear jack 5 and the rear end of the heat exchange tube 14 to be tested. The front end of the heat exchange tube 14 is inserted into the mating groove 12 of the front flange block 9, and the rear end of the heat exchange tube 14 is inserted into the mating groove 12 of the rear flange block 6. Both mating grooves 12 are pre-filled with... A ring-shaped sealing gasket is placed. The front jack 2 extends and presses against the front water injection cylinder 3, and the rear jack 5 extends and presses against the rear flange block 6. Water is then injected into the front water injection cylinder 3 through the pipe 10. When the heat exchange tube 14 and the front water injection cylinder 3 are filled with water and water overflows from the pressure detection port, the water injection is stopped. The pressure gauge detection unit 11 is installed on the pressure detection port, and then the pressure is increased and maintained. If obvious leakage, abnormal noise, or pressure drop occurs, it can be determined that there is a leak in this heat exchange tube.

Claims

1. A device for detecting leaks in heat exchanger tubes, characterized in that: include: The system comprises a front fixed baffle, a front jack, a front water injection cylinder, a rear fixed baffle, a rear jack, and a rear flange block. Both the front and rear fixed baffles are used for fixing and supporting the jacks. The front jack pushes the front water injection cylinder, and the rear jack pushes the rear flange block. The front water injection cylinder consists of a cylinder tube, a tail cap, and a front flange block. The tail cap is welded to and seals the rear end of the cylinder tube, and the front flange block is welded to and seals the front end of the cylinder tube. An inlet and a pressure testing port are provided on the cylinder tube. A connecting pipe is welded to the inlet, and a flange is welded to the connecting pipe port. An internal thread is machined in the pressure testing port, and a detachable pressure gauge unit is threadedly connected to the pressure testing port. A mating groove for inserting a heat exchange tube port is machined on the front end face of the front flange block, and a through hole is also machined on the front flange block to connect the mating groove to the inner cavity of the cylinder tube. A mating groove for inserting a heat exchange tube port is also machined on the front end face of the rear flange block. An annular sealing gasket is provided in both mating grooves.

2. The heat exchanger tube leak detection device according to claim 1, characterized in that: The rear end of the front jack is fixed to the front fixed baffle, and the rear end of the rear jack is fixed to the rear fixed baffle.

3. A heat exchanger tube leak detection device according to claim 1 or 2, characterized in that: The annular sealing gasket is a flexible graphite gasket.

4. A heat exchanger tube leak detection device according to claim 1 or 2, characterized in that: The port of the mating groove has a guide bevel.

5. A heat exchanger tube leak detection device according to claim 1 or 2, characterized in that: The inner diameter of the mating groove is 2mm larger than the outer diameter of the heat exchange tube.

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