Heat exchanger tube head welding seam pressure test tool

Abstract

The utility model provides a heat exchanger tube head welding seam pressure test tool which comprises a shell pass, a connecting piece, a sealing ring and a tube plate. A connecting piece is arranged on one side of the shell pass, a tube plate is clamped on the free side of the connecting piece through a sealing ring, and a through hole is formed in the connecting piece close to the sealing ring and faces the shell pass in a penetrating mode. The shell pass, the connecting piece, the sealing ring and the tube plate are matched with one another, gas or water is blown to the tube plate through the shell pass, part of gas or water extrudes the sealing ring through the through hole to enable the sealing ring to clamp the tube plate, and at the moment, whether the pressure test of the welding seam of the tube head is qualified or not can be determined by observing whether the welding seam of the tube plate and the heat exchange tube leaks gas or water or not. The pressure test can be conveniently and efficiently carried out on the pipe head welding seam.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger manufacturing, specifically a pressure testing fixture for the weld seam of a heat exchanger tube head. Background Technology

[0002] Floating head heat exchangers are widely used heat exchange equipment in industrial production. During the manufacturing process, the weld seams of the tube heads (heat exchange tubes and tube sheets) need to be pressure tested. Due to the structural form of the floating head heat exchanger, special pressure testing tools are required when performing this test on the tube head weld seams.

[0003] Common Method 1: Using a dedicated sealing gasket and pressure testing fixture, a separate pressure testing system is started before the pressure test to increase the pressure of the sealing gasket cavity to above the test pressure at the pipe head, so as to achieve a seal between the sealing gasket, the tube sheet, and the test device. Then, the main pressure testing pump is started according to the normal procedure to test the pressure at the pipe head. This method requires a separate pressure lifting system, including pipeline control instruments, pressure source, and buffer system. The sealing gasket can easily be damaged if not handled carefully. Common Method 2: Using a packing compression type sealing structure, which requires dedicated connectors, packing compression devices, and standard connecting parts, and is not suitable for higher test pressures. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to conveniently and efficiently conduct pressure tests on pipe head welds.

[0005] This utility model solves the above-mentioned technical problems through the following technical means:

[0006] A pressure testing fixture for heat exchanger tube head welds includes a shell side (1), a connector (2), a sealing ring (3), and a tube sheet (4); a connector (2) is provided on one side of the shell side (1), and the tube sheet (4) is clamped on the free side of the connector (2) by the sealing ring (3), and a through hole (232) is provided in the connector (2) near the sealing ring (3) and extending through the shell side (1).

[0007] Beneficial effects: Through the cooperation of the shell side, connectors, sealing rings, and tube sheet, air or water is blown or passed through the shell side towards the tube sheet. Some of the gas or water will squeeze the sealing ring through the through hole, causing the sealing ring to lock the tube sheet. At this time, it can be determined whether the pressure test at the tube head weld is qualified by observing whether there is air or water leakage at the weld between the tube sheet and the heat exchange tube. It can be conveniently and efficiently carried out pressure test on the tube head weld.

[0008] Furthermore, the shell side (1) and the connecting member (2) are fixed by bolts.

[0009] Furthermore, the shell side (1) is made of steel.

[0010] Furthermore, the shell side (1) is made of 16MnⅡ.

[0011] Furthermore, the connector (2) includes a mounting ring (21), a connecting ring (22), and a retaining ring (23). The mounting ring (21) is fixed to the outer side of the connecting ring (22) near the shell side (1), and the retaining ring (23) is fixed to the inner side of the connecting ring (22) away from the shell side (1). The mounting ring (21) is fixed on the shell side (1), and the tube sheet (4) is clamped in the annular notch of the retaining ring (23).

[0012] Furthermore, the mounting ring (21), connecting ring (22), and retaining ring (23) are welded and fixed in sequence.

[0013] Furthermore, the retaining ring (23) has a circumferentially oriented mounting opening (231) near the tube sheet (4). The mounting opening (231) is circular. The mounting ring (21) has a through hole (232) that extends through the shell side (1) near the mounting opening (231). A sealing ring (3) is placed inside the mounting opening (231).

[0014] Furthermore, the vertical cross-section of the sealing ring (3) is U-shaped.

[0015] Beneficial effects: By designing the shape of the sealing ring, the concave opening can trap gas or water, allowing the sealing ring to generate greater compressive force.

[0016] Furthermore, the mounting ring (21) and retaining ring (23) are made of 16MnⅡ or Q235B, and the connecting ring (22) is made of Q345R.

[0017] Furthermore, the tube sheet (4) is made of 16MnⅡ and the sealing ring (3) is made of silicone rubber. Attached Figure Description

[0018] Figure 1 This is a partial front sectional view of the pressure testing fixture for the heat exchanger tube head weld in Embodiment 1 of this utility model;

[0019] Figure 2 for Figure 1 A magnified view of A in the middle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Example 1

[0022] like Figure 1 As shown, this embodiment provides a pressure testing fixture for the weld seam of a heat exchanger tube head, including a shell side 1, a connector 2, a sealing ring 3, and a tube sheet 4.

[0023] like Figure 1 As shown, the shell side 1 is arranged in a circular ring. A connecting piece 2 is fixed on one side of the shell side 1. In this embodiment, the shell side 1 and the connecting piece 2 are fixed by bolts. The other side of the shell side 1 can be installed on a pressurizing mechanism (not shown in the figure). The pressurizing mechanism can pressurize by adding air or water. The shell side 1 is made of steel. In this embodiment, the shell side 1 is made of 16MnⅡ.

[0024] like Figure 1 , Figure 2 As shown, the connector 2 includes a mounting ring 21, a connecting ring 22, and a retaining ring 23. The mounting ring 21 is fixed to the outer side of the connecting ring 22 near the shell side 1, and the retaining ring 23 is fixed to the inner side of the connecting ring 22 away from the shell side 1. In this embodiment, the mounting ring 21, connecting ring 22, and retaining ring 23 are welded and fixed in sequence, and the mounting ring 21 is bolted to the shell side 1. A tube sheet 4 is fitted into the annular notch of the retaining ring 23. A circumferentially circumferentially opening 231 is provided in the center of the retaining ring 23 near the tube sheet 4. The opening 231 is circular. A through hole 232 is provided in the mounting ring 21 near the opening 231, extending towards the shell side 1. A sealing ring 3 is placed in the opening 231. The vertical cross-section of the sealing ring 3 is U-shaped. When the pressurizing mechanism fills the shell side 1 with air or water, the gas or water flows from the through hole 232 to the sealing ring 3. The tube sheet 4 is clamped for sealing. Heat exchange tubes (not shown) are welded to the free side of the tube sheet 4. If the weld between the tube sheet 4 and the heat exchange tubes is leak-proof when gas or water is added, the pressure test is considered successful. The connecting piece 2 and the tube sheet 4 are made of steel, and the sealing ring 3 is made of rubber. In this example, the tube sheet 4 is made of 16MnII, the mounting ring 21 and retaining ring 23 are made of 16MnII or Q235B, the connecting ring 22 is made of Q345R, and the sealing ring 3 is made of silicone rubber. The sealing ring 3 and the tube sheet 4 form a self-tightening seal. Through a through hole 232 on the other side of the sealing ring 3, one side of the sealing ring 3 is always kept consistent with the pressure inside the shell side 1. Thus, under the pressure on one side, the sealing ring 3 forms an effective seal with the tube sheet 4. Different sealing materials can be selected for the sealing ring 3 according to the test pressure to suit different test pressures.

[0025] During use, the shell side 1 is sealed to the pressurizing mechanism. The pressurizing mechanism fills the shell side 1 with air or water. Most of the gas or water flows towards the tube sheet 4, while a small amount of gas or water flows from the through hole 232 to the sealing ring 3, causing the sealing ring 3 to lock the tube sheet 4 for sealing. Then, observe whether there is any air or water leakage at the weld between the tube sheet 4 and the heat exchange tube. If there is no air or water leakage at the weld between the tube sheet 4 and the heat exchange tube, the tube head weld pressure test is qualified.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressure testing fixture for the weld seam of a heat exchanger tube head, characterized in that, Includes shell side (1), connector (2), sealing ring (3), tube sheet (4); A connector (2) is provided on one side of the shell side (1). The tube sheet (4) is clamped on the free side of the connector (2) by a sealing ring (3). A through hole (232) is provided in the connector (2) near the sealing ring (3) and extends through the shell side (1).

2. The pressure testing fixture for heat exchanger tube head welds according to claim 1, characterized in that: The shell side (1) and the connecting part (2) are fixed by bolts.

3. The pressure testing fixture for heat exchanger tube head welds according to claim 1, characterized in that: The shell side (1) is made of steel.

4. The pressure testing fixture for heat exchanger tube head welds according to claim 3, characterized in that: The shell side (1) is made of 16MnⅡ.

5. The pressure testing fixture for heat exchanger tube head welds according to claim 1, characterized in that: The connector (2) includes a mounting ring (21), a connecting ring (22), and a retaining ring (23). The mounting ring (21) is fixed to the outer side of the connecting ring (22) near the shell side (1), and the retaining ring (23) is fixed to the inner side of the connecting ring (22) away from the shell side (1). The mounting ring (21) is fixed on the shell side (1), and the tube sheet (4) is clamped in the annular notch of the retaining ring (23).

6. The pressure testing fixture for heat exchanger tube head welds according to claim 5, characterized in that: The mounting ring (21), connecting ring (22), and retaining ring (23) are welded and fixed in sequence.

7. The pressure testing fixture for heat exchanger tube head welds according to claim 5, characterized in that: The retaining ring (23) has a circumferentially oriented mounting opening (231) near the tube sheet (4). The mounting opening (231) is circular. The mounting ring (21) has a through hole (232) that extends through the shell side (1) near the mounting opening (231). A sealing ring (3) is placed inside the mounting opening (231).

8. The pressure testing fixture for heat exchanger tube head welds according to claim 7, characterized in that: The vertical cross-section of the sealing ring (3) is U-shaped.

9. The pressure testing fixture for heat exchanger tube head welds according to claim 5, characterized in that: The mounting ring (21) and retaining ring (23) are made of 16MnⅡ or Q235B, and the connecting ring (22) is made of Q345R.

10. The pressure testing fixture for the weld seam of a heat exchanger tube head according to claim 1, characterized in that: The tube sheet (4) is made of 16MnⅡ and the sealing ring (3) is made of silicone rubber.

Images