Heat exchanger tube and tube plate helium leak detection test device

Abstract

The utility model relates to a detection technology for welding of a tube and a tube plate in the field of manufacturing of pressure vessel equipment, relates to a helium leak detection test device for a tube and a tube plate of a heat exchanger, and aims to overcome the defect of lack of a helium leak detection device which is simple and convenient to operate, compact in structure, reusable and low in cost. According to the technical scheme, a handle and a suction gun connector are fixed to the front face of a baffle, the suction gun connector is communicated with the baffle, the suction gun connector is used for being connected with a sniffing probe to detect helium leakage, and a sealing strip and a positioning mandrel are fixed to the back face of the baffle. The sealing strip is annular and fixed to the baffle along the outline of the sealing strip, the sealing strip is used for abutting against gaps between adjacent tube holes in a tube plate of a heat exchange tube so that the position, covered by the baffle, of the tube plate can be sealed, the positioning mandrel is used for being inserted into the tube holes in the tube plate of the heat exchange tube to position the baffle, and the whole device is easy to manufacture and operate. Large-range helium leakage detection of the tube plate can be realized and the efficiency is high.

Description

Technical Field

[0001] This invention relates to the detection technology of tube and tube sheet welding in the field of pressure vessel equipment manufacturing, specifically to a helium leak detection test device for heat exchanger tubes and tube sheets. Background Technology

[0002] In the manufacturing process of pressure vessel heat exchangers, the welding quality between tubes and tube sheets is crucial, especially the welds on the primary side of the tube-to-tube sheet joint. The quality of these welds directly affects the heat exchanger's heat exchange efficiency and the overall sealing performance of the equipment. Therefore, rigorous inspection of the welds is a key step in the heat exchanger manufacturing process.

[0003] While traditional weld inspection methods can meet inspection requirements to some extent, they are inadequate for large-scale equipment. With numerous tubes and thousands to tens of thousands of weld seams at the tube ends, the equipment's built-in helium leak detection devices are relatively small, only able to inspect nine tube holes simultaneously. This results in complex operation, low inspection efficiency, and high costs. Particularly in helium leak detection, traditional devices and methods often fail to guarantee the accuracy and reliability of the results. Currently, there is a lack of a simple, compact, reusable, and low-cost helium leak detection device to meet the needs of tube and tube sheet weld inspection during heat exchanger manufacturing. Utility Model Content

[0004] The purpose of this utility model patent is to overcome the technical problem of lacking a simple, compact, reusable and low-cost helium leak detection device to meet the needs of tube and tube sheet weld inspection in the manufacturing process of heat exchanger equipment. This invention proposes a helium leak detection test device for heat exchanger tubes and tube sheets.

[0005] The purpose of this utility model is achieved as follows: a helium leak detection test device for heat exchanger tubes and tube sheets, which includes a baffle, a handle, a sealing strip, a positioning mandrel, and a suction gun interface;

[0006] The handle and suction gun interface are fixed to the front of the baffle. The suction gun interface is connected to the baffle and is used to connect the sniffing probe to detect helium leakage. The sealing strip and positioning mandrel are fixed to the back of the baffle. The sealing strip is ring-shaped and fixed to the baffle along the outline of the sealing strip. The sealing strip is used to press against the gap between adjacent tube holes on the heat exchange tube sheet to form a seal at the tube sheet covered by the baffle. The positioning mandrel is used to insert into the tube hole on the heat exchange tube sheet to position the baffle.

[0007] Furthermore, the sealing strip and the baffle are bonded together with sealant.

[0008] Furthermore, there are at least two positioning spindles.

[0009] Furthermore, the handle is welded to the baffle.

[0010] Furthermore, the baffle is diamond-shaped.

[0011] Furthermore, the slope of the baffle is the same as the slope of the inclined arrangement of the tube holes on the tube sheet.

[0012] Beneficial effects:

[0013] This solution provides a helium leak detection test device for heat exchanger tubes and tube sheets. After fixing the suction gun interface to the baffle, a sniffing probe is connected, which expands the inspection range for each test. If there is no alarm, the test is completed after several coverage cycles. If an alarm is triggered, the range is narrowed down, which improves the speed of helium leak detection, saves production cycle time, and the device can be reused.

[0014] A baffle is located on the outer periphery of the tube-to-tube sheet weld, working together with the sealing strip to seal the tube end weld. A positioning mandrel connects to the tube sheet nozzle for positioning, providing a fulcrum for the suction gun interface and fixing it to the tube sheet. This heat exchanger tube-to-tube sheet helium leak detection device features an upper handle for easy assembly and disassembly. The entire device is simple to manufacture, easy to operate, and can achieve high efficiency in detecting helium leaks over a wide area of ​​the tube sheet. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a helium leak detection test device for heat exchanger tubes and tube sheets according to this utility model. Figure 1 .

[0016] Figure 2 This is a schematic diagram of a helium leak detection test device for heat exchanger tubes and tube sheets according to this utility model. Figure 2 .

[0017] In the diagram: Part 1 - baffle; Part 2 - handle; Part 3 - sealing strip; Part 4 - positioning mandrel; Part 5 - suction gun interface; Part 6 - olfactory probe. Detailed Implementation

[0018] Specific implementation method 1: A heat exchanger tube sheet helium leak detection test device, which includes a baffle 1, a handle 2, a sealing strip 3, a positioning mandrel 4, and a suction gun interface 5;

[0019] Handle 2 and suction gun interface 5 are fixed to the front of baffle 1. Suction gun interface 5 is connected to baffle 1 and is used to connect the sniffing probe 6 to detect helium leakage. Sealing strip 3 and positioning mandrel 4 are fixed to the back of baffle 1. Sealing strip 3 is annular and fixed to baffle 1 along the outline of sealing strip 3. Sealing strip 3 is used to press against the gap between adjacent tube holes on the heat exchange tube sheet to form a seal at the tube sheet covered by baffle 1. Positioning mandrel 4 is used to insert into the tube hole on the heat exchange tube sheet to position baffle 1.

[0020] In this embodiment: The helium leak detection device of the present invention mainly addresses the sniffing probe detection method in helium leak detection, and improves the sniffing probe. The complete device, in addition to the sniffing probe, also includes a helium mass spectrometer leak detector, a standard leak hole, a pressure gauge, the heat exchanger under test, connecting pipes, and other components. The sniffing probe is connected to the helium mass spectrometer leak detector, and the other end adopts a sealed cover structure (baffle + sealing strip) to form a sealed detection system with the component under inspection (tube sheet orifice). The standard leak hole is used for system sensitivity determination, the pressure gauge is used to detect the sealing performance of the device and measure the test pressure, and the connecting pipes are used to connect to the helium leak detector or a helium gas conduit.

[0021] The suction gun interface is used to connect the sniffing probe to detect helium leakage. The sealing strip is used to press against the gap between adjacent tube holes on the heat exchange tube sheet to form a seal at the tube sheet covered by the baffle 1. The positioning mandrel is used to insert into the tube hole on the heat exchange tube sheet to position the baffle 1.

[0022] Specific implementation method 2: A heat exchanger tube sheet helium leak detection test device, wherein the sealing strip 3 and the baffle 1 are bonded together by sealant.

[0023] In this embodiment: sealing strips are placed according to the hole size of the tube sheet holes to achieve a sealing effect. The sealing strips are then firmly fixed to the baffle with sealant, and the sealing effect is verified by testing.

[0024] Other implementation methods are the same as those in Specific Implementation Method 1.

[0025] Specific implementation method three: A heat exchanger tube sheet helium leak detection test device, wherein there are at least two positioning mandrels 4.

[0026] In this embodiment: two positioning mandrels are arranged according to the tube hole positions of the tube sheet to ensure that both positioning mandrels can be inserted into the tube hole of the tube sheet, thus ensuring the accurate position of the device. The positioning mandrels are fixedly connected to the baffle.

[0027] Other implementation methods are the same as those in Specific Implementation Method 1.

[0028] Specific implementation method four: A heat exchanger tube and tube sheet helium leak detection test device, wherein the handle 2 is welded to the baffle 1.

[0029] In this embodiment, the handle is welded to the baffle, and the welding is secure, making it convenient to operate the handle to move the baffle, so that the baffle can be disassembled and assembled at the tube sheet.

[0030] Other implementation methods are the same as those in Specific Implementation Method 1.

[0031] Specific Implementation Method 5: A heat exchanger tube sheet helium leak detection test device, wherein the baffle 1 is rhomboid.

[0032] In this embodiment: multiple adjacent pipe holes on the tube sheet are usually arranged in multiple rows at an angle, and the baffle is set in a rhombus shape and a sealing strip is installed to cover the rhombus area composed of multiple pipe holes.

[0033] Other implementation methods are the same as those in Specific Implementation Method 1.

[0034] Specific Implementation Method Six: A heat exchanger tube sheet helium leak detection test device, wherein the slope of the inclined side of the baffle 1 is the same as the slope of the inclined arrangement of the tube holes on the tube sheet.

[0035] In this embodiment: the baffle size is designed according to the hole layout of the product tube sheet. First, a row of horizontal tube holes is used as the reference, and then the slope of a row of obliquely arranged tube holes is used as the slope of the baffle.

[0036] Other implementation methods are the same as those in Specific Implementation Method 5.

[0037] Work process:

[0038] Production and use:

[0039] Step 1: Design the baffle size according to the hole layout of the product tube sheet, and cut and calibrate the material;

[0040] Step 2: Place the sealing strip according to the size of the fabric holes to achieve a sealing effect. Secure it firmly to the baffle with sealant and test to verify the sealing effect.

[0041] Step 3: Arrange two positioning mandrels according to the hole positions to ensure accurate device positioning, and fix the positioning mandrels to the baffle.

[0042] Step 4: Set the lower suction gun interface, connect it to the equipment suction gun during use, and seal it.

[0043] Step 5: Add an upper handle, weld it securely, and make it easy to assemble and disassemble.

[0044] Step Six: Test and verify the sealing effect, and fine-tune the relevant positions.

Claims

1. A helium leak detection test device for heat exchanger tubes and tube sheets, characterized in that: It includes a baffle (1), a handle (2), a sealing strip (3), a positioning spindle (4), and a suction gun interface (5). The handle (2) and the suction gun interface (5) are fixed on the front of the baffle (1). The suction gun interface (5) is connected to the baffle (1). The suction gun interface (5) is used to connect the sniffing probe (6) to detect helium leakage. The sealing strip (3) and the positioning mandrel (4) are fixed on the back of the baffle (1). The sealing strip (3) is in the shape of a ring and is fixed on the baffle (1) along the outline of the sealing strip (3). The sealing strip (3) is used to press against the gap between adjacent tube holes on the heat exchange tube tube sheet, so that the tube sheet covered by the baffle (1) forms a seal. The positioning mandrel (4) is used to insert into the tube hole on the heat exchange tube tube sheet to position the baffle (1).

2. The heat exchanger tube sheet helium leak detection test device according to claim 1, characterized in that: The sealing strip (3) and the baffle (1) are bonded together with sealant.

3. The heat exchanger tube sheet helium leak detection test device according to claim 1, characterized in that: There are at least two positioning mandrels (4).

4. The heat exchanger tube sheet helium leak detection test device according to claim 1, characterized in that: The handle (2) is welded to the baffle (1).

5. The heat exchanger tube sheet helium leak detection test device according to claim 1, characterized in that: The baffle (1) is rhomboid.

6. The heat exchanger tube sheet helium leak detection test device according to claim 5, characterized in that: The slope of the baffle (1) is the same as the slope of the pipe hole on the tube sheet.

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