Pressure test tool for floating head heat exchanger

Abstract

The utility model discloses a pressure test tool for a floating head heat exchanger, which comprises an outer cylinder, flanges are respectively fixed at two ends of the outer cylinder, and the outer cylinder is hermetically connected with a flange in a heat exchanger cylinder through a flange at the left end; a flange is fixed at one end of the inner cylinder, and the other end is combined with the inner wall of the outer cylinder and connected through the flange; the elastic sealing piece is arranged at the contact end of the inner cylinder and the outer cylinder; and the floating tube plate is coaxially arranged at the inner ends of the outer cylinder and the inner cylinder and is sealed and fixed through an elastic sealing piece. According to the pressure test tool, the floating tube plate is conveniently limited and sealed through the outer cylinder, the inner cylinder and the elastic sealing piece, so that the floating tube plate is fixed in the cylinder body, and a pressure test is conveniently carried out.

Description

Technical Field

[0001] The utility model relates to the field of heat exchanger pressure testing, in particular to a pressure testing tool for a floating head type heat exchanger. Background Art

[0002] During the manufacturing process of heat exchanger equipment, after the equipment is completed, it is necessary to perform a pressure test on the shell and tube side of the equipment to verify the equipment strength and whether the welds are leaking. For example, the pressure test of a traditional fixed tube-sheet heat exchanger can be completed by simply passing gas or liquid into the corresponding pipe openings of the sealed shell and tube side.

[0003] In petrochemical equipment, the floating head heat exchanger is one of the many heat exchangers. Due to its special structure and different product specifications and sizes, the pressure test of its tube bundle requires the preparation of special pressure test tooling, which has a high production cost. At the same time, since the tube bundle of the floating head heat exchanger, together with the floating head, can freely expand and contract along the axial direction to eliminate temperature difference stress, the floating tube sheet needs to be exposed during the pressure test to facilitate the observation of the tube head weld for leakage, and the free expansion and contraction point also needs to be sealed.

[0004] The traditional floating head heat exchanger pressure test tooling uses a conical cylinder to weld the outer head cover side flange to the floating tube sheet. After the pressure test, the conical cylinder is cut off and the connecting welds on the outer head cover side flange and the floating tube sheet are ground flat. The workload of welding and cutting the conical cylinder and grinding the welds is very large. In addition, the welds between the floating tube sheet and the heat exchanger are easily cracked due to uneven stress and heat during the welding, cutting and grinding process, thereby affecting product quality. In addition, the problems of weld porosity and slag inclusion during welding lead to poor sealing effect. Utility Model Content

[0005] Therefore, in order to address at least one of the above-mentioned deficiencies, the present invention provides a pressure test fixture for a floating head heat exchanger. The pressure test fixture facilitates the placement of the floating tube sheet inside the outer tube and the inner tube, and provides a seal at the connection between the outer tube and the inner tube. The seal elastically deforms and contacts the outer wall of the floating tube sheet, thereby achieving sealing of the floating tube sheet and facilitating pressure testing.

[0006] The utility model is realized by constructing a pressure test fixture for a floating head heat exchanger, comprising an outer cylinder, flanges are fixed at both ends of the outer cylinder and the flange at the left end is kept in a sealed connection with the flange inside the heat exchanger cylinder;

[0007] The inner cylinder has a flange fixed on one end and the other end is coupled to the inner wall of the outer cylinder and connected via the flange;

[0008] an elastic sealing member, provided on the contact end between the inner cylinder and the outer cylinder;

[0009] The floating tube sheet is coaxially arranged at the inner ends of the outer tube and the inner tube and is sealed and fixed by elastic sealing members.

[0010] Specifically, a notch is provided on one side of the inner wall of the outer cylinder, one end of the inner cylinder is inserted into the notch and combined with the inner wall of the outer cylinder, and the elastic seal is arranged between the notch of the outer cylinder and the end of the inner cylinder.

[0011] Specifically, when the inner cylinder is inserted into the notch of the outer cylinder, the inner wall of the inner cylinder is flush with the inner wall of the outer cylinder.

[0012] Specifically, the elastic sealing member is an O-ring.

[0013] Specifically, the flanges are connected by bolts and nuts.

[0014] Specifically, a sealing groove is provided on the flange end surface where the outer cylinder is connected to the cylinder flange, and a sealing ring is fixed in the sealing groove.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The test fixture can facilitate the fixing of the floating tube sheet inside the cylinder by setting up the outer cylinder, the inner cylinder and the elastic seal. At the same time, the elastic deformation of the elastic seal realizes the sealing and fixation of the floating tube sheet to the inner wall of the outer cylinder and the inner wall of the inner cylinder, thereby ensuring the accuracy of the pressure test and facilitating the pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the specific embodiments of the present invention, they are used to explain the present invention but do not constitute any limitation to the present invention. In the accompanying drawings:

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

[0019] Figure 2 This is a schematic diagram of the structure of the outer cylinder and the flanges at both ends of the utility model;

[0020] Figure 3 This is a schematic structural diagram of the inner cylinder and flange in the present invention;

[0021] Figure 4 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0022] In the figure: 1. Outer tube; 1.1. Notch; 2. Flange; 3. Inner tube; 4. Elastic seal; 5. Floating tube sheet; 6. Sealing groove. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be further described in detail below through specific embodiments and in combination with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention in any way. The accompanying drawings in the present invention are only used to assist in the description of the embodiments and to facilitate understanding and are not intended to limit the present invention in any way.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0025] As described in the background technology, the existing test tooling welds the conical cylinder on the floating tube sheet and the outer head cover side flange. Due to the generation of air holes and slag inclusions during the welding process, the sealing effect is poor, which affects the accuracy of the pressure test. At the same time, after the pressure test, the conical cylinder is cut off, and the connecting welds on the outer head cover side flange and the floating tube sheet are ground flat. The workload of welding and cutting the conical cylinder and grinding the welds is very large. In addition, during the welding, cutting and grinding process, the welds between the floating tube sheet and the heat exchanger are easily caused to crack due to uneven stress and heat, thereby affecting product quality.

[0026] For the reasons mentioned above, please refer to the attached Figure 1 ~Attached Figure 4 The present invention provides a pressure test fixture for a floating head heat exchanger, comprising an outer cylinder 1, with flanges 2 fixed at both ends (the fixing method is welding and sealing, and the attached Figure 2 It can be seen that after welding, the inner wall of the flange is in contact with the inner wall of the outer cylinder) and is connected to the flange inside the cylinder (i.e., the shell of the floating head heat exchanger) through the flange 2 at the left end;

[0027] The inner tube 3 has a flange 2 fixed on one end and the other end is coupled to the inner wall of the outer tube 1 and connected via the flange 2;

[0028] The elastic sealing member 4 is provided on the contact end between the inner tube 3 and the outer tube 1;

[0029] The floating tube sheet 5 is coaxially arranged at the inner ends of the outer tube 1 and the inner tube 3 and is sealed and fixed by an elastic seal 4 .

[0030] In order to solve the problem that the elastic seal cannot be fixed inside the outer cylinder, a feasible solution is provided here. Please refer to the attached Figure 1 ~Attached Figure 4Specifically, a slot 1.1 is provided on one side of the inner wall of the outer cylinder 1, one end of the inner cylinder 3 is inserted into the slot 1.1 and combined with the inner wall of the outer cylinder 1, and the elastic seal 4 is arranged between the slot 1.1 of the outer cylinder 1 and the end of the inner cylinder 3.

[0031] The lateral expansion margin of the elastic seal 4, due to the positive pressure of the tooling (i.e., the compression of the elastic seal by the inner tube after insertion into the notch of the outer tube), presses against the side surface of the floating tube sheet 5, generating friction. This prevents the lateral expansion margin from deforming and shifting due to the positive stress from the shell (i.e., the fluid pressure at the inner ends of the outer and inner tubes), thereby achieving the effect of sealing and fixing the floating tube sheet within the inner and outer tubes.

[0032] In order to realize the floating tube sheet can move on the inner wall of the outer tube and the inner tube, and realize the elastic deformation of the elastic seal to seal the floating tube sheet to the inner wall of the outer tube and the inner tube, a feasible solution is provided. Please refer to the attached Figure 1 and attached Figure 4 Specifically, when the inner cylinder 3 is inserted into the notch 1.1 of the outer cylinder 1, the inner wall of the inner cylinder 3 is flush with the inner wall of the outer cylinder 1.

[0033] In order to achieve elastic deformation and sealing effect of the elastic seal, a feasible solution is provided herein. Specifically, the elastic seal 4 is an O-ring.

[0034] In order to facilitate the sealing and fixing of the floating tube sheet during the pressure test of the heat exchanger, and also facilitate the release of the floating tube sheet after the test, a feasible solution is provided herein. Specifically, the flanges 2 are connected by bolts and nuts. The bolt and nut connection not only facilitates disassembly, but also allows adjustment of the pre-tightening force during the connection, thereby squeezing the elastic seal 4 to deform and fill the gap between the floating tube sheet 5 and the outer tube and the inner wall of the inner tube, thereby achieving sealing and fixing of the floating tube sheet 5.

[0035] In order to facilitate the sealed connection between the outer cylinder and the internal flange of the heat exchanger, thereby ensuring the accuracy of the pressure test, a feasible solution is provided herein. Specifically, a sealing groove 6 is provided on the end face of the flange 2 that connects the outer cylinder and the cylinder flange, and a sealing ring is fixed in the sealing groove 6.

[0036] Specifically, the floating-head heat exchanger has a conventional structure, specifically including a shell component (i.e., an outer shell with openings at both ends and a tube box movably connected to the openings at both ends of the shell), a tube bundle component (i.e., a tube bundle for fixing the internal heat exchange tubes, specifically including a fixed tube sheet and a floating tube sheet 5), heat exchange tubes, and flanges. This pressure test fixture only installs the floating tube sheet 5, so that it is sealed and fixed inside the heat exchanger shell for pressure testing. The fixed tube sheet is directly fixed to the flange at the other end of the heat exchanger shell via a flange plate and maintains a seal.

[0037] Before the test, the test fixture is pre-inserted into the shell component, and the flange preset on the fixed tube sheet is maintained in a sealed connection with the flange inside the heat exchanger cylinder. Then the test fixture is installed. During installation, the outer tube 1 is first sleeved on the outer end of the floating tube sheet 5 and the left end flange of the outer tube 1 is maintained in a sealed connection with the flange inside the heat exchanger cylinder (i.e., the shell component of the heat exchanger) through the sealing ring placed in the sealing groove 6 (bolts and nuts are passed through the outer tube and the flange inside the cylinder to keep it tight). Then, the elastic seal 4 is inserted into the notch 1.1 of the outer tube 1 and squeezed into the inside of the notch 1.1 through the end of the inner tube 3 to press the elastic seal 4 against the notch. 1.1, keeping the outer portion of the floating tube sheet 5 on the elastic seal 4. Finally, bolts and nuts are passed through the flange 2 between the outer tube 1 and the inner tube 3 to connect them. During the connection process, the elastic seal 4 is squeezed and deformed. Because the ends of the elastic seal 4 are respectively limited by the inner end of the notch 1.1 and the end of the inner tube 3, and the outer end of the elastic seal 4 is limited by the inner wall of the notch 1.1, it moves toward the floating tube sheet 5 during the deformation process, thereby filling the gaps between the floating tube sheet 5 and the inner walls of the outer tube 1 and the inner tube 3, completing the sealing and fixation of the floating tube sheet 5. Finally, a pressure test can be performed (this pressure test can be performed using air pressure or hydraulic pressure).

[0038] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit suggested by the present invention should fall within the scope of the patent covered by the present invention.

Claims

1. A pressure test fixture for a floating head heat exchanger, characterized by: include The outer cylinder has flanges fixed at both ends and is tightly connected to the flange inside the heat exchanger cylinder through the flange at the left end; The inner cylinder has a flange fixed on one end and the other end is coupled to the inner wall of the outer cylinder and connected via the flange; an elastic sealing member, provided on the contact end between the inner cylinder and the outer cylinder; The floating tube sheet is coaxially arranged at the inner ends of the outer tube and the inner tube and is sealed and fixed by elastic sealing members.

2. The pressure test fixture for a floating head heat exchanger according to claim 1, characterized in that: A notch is provided on one side of the inner wall of the outer cylinder, one end of the inner cylinder is inserted into the notch and combined with the inner wall of the outer cylinder, and the elastic sealing member is arranged between the notch of the outer cylinder and the end of the inner cylinder.

3. The pressure test fixture for a floating head heat exchanger according to claim 1, characterized in that: When the inner cylinder is inserted into the notch of the outer cylinder, the inner wall of the inner cylinder is flush with the inner wall of the outer cylinder.

4. The pressure test fixture for a floating head heat exchanger according to claim 1 or 2, characterized in that: The elastic sealing member is an O-ring.

5. The pressure test fixture for a floating head heat exchanger according to claim 1, characterized in that: The flanges are connected by bolts and nuts.

6. The pressure test fixture for a floating head heat exchanger according to claim 1, characterized in that: A sealing groove is provided on the flange end surface where the outer cylinder is connected to the cylinder flange, and a sealing ring is fixed in the sealing groove.

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