Detachable quick leaking stoppage connector for heat exchange tube

Abstract

A detachable quick leaking stoppage connector for a heat exchange tube is characterized by comprising a core rod (1), an O-shaped sealing ring (2), an inner sleeve (3), an expansion tube (4), a jackscrew tube (5) and a fastening nut (6). One end of the core rod (1) is of a T-shaped structure, an annular groove is formed in the T-shaped end, an operation face is arranged at the other end of the core rod (1), and the O-shaped sealing ring (2) is arranged at the front end of the inner sleeve (3) in a sleeved mode. The rear end of the inner sleeve (3) is of a conical structure; one end of the expansion pipe (4) is of a petal-shaped structure capable of being opened, the petal-shaped structure is opened and tightly abuts against the inner wall of the heat exchange pipe after being matched with the conical structure of the inner sleeve (3), internal threads are arranged at the other end of the expansion pipe (4) and matched with external threads of the jackscrew pipe (5), the internal threads of the jackscrew pipe (5) are matched with external threads on the core rod (1), and the fastening nut is screwed on the external threads of the core rod (1). The detachable quick leaking stoppage connector structure can achieve two-way sealing, reliable plugging can be provided for a heat exchange tube of a tubular heat exchanger, and the detachable quick leaking stoppage connector structure is simple in structure, convenient to install and detach, capable of being repeatedly used and convenient to further maintain and replace.

Description

Technical Field

[0001] The utility model relates to a leak-proofing technology for a heat exchanger, in particular to a leak-proofing technology for a heat exchange tube constituting the heat exchanger, specifically to a detachable quick leak-proofing joint for the heat exchange tube. Background Art

[0002] Heat exchangers account for more than half of all chemical equipment. Most heat exchangers have hundreds to tens of thousands of heat exchange tubes. Heat exchange tube leakage is a common and very troublesome problem in chemical plants.

[0003] Once a heat exchange tube leaks, the usual treatment method is to seal the heat exchange tube and no longer use the leaking heat exchange tube. There are generally two methods for sealing: one is welding sealing, and the other is plugging with a conical plug.

[0004] Welding plugging Figure 1 As shown, the advantage is firm welding, but the disadvantage is that welding is difficult, which is mainly reflected in two aspects: first, there is a medium that is difficult to remove on the back of the heat exchange tube, which will affect the welding quality and even cause new leakage; second, the technical requirements for welding are very high, especially for heat exchange tubes made of non-ferrous metals, which have high requirements on the technical skills and cleanliness of welders.

[0005] Conical plug plugging Figure 2 As shown, the advantage is that it is easy to operate, but it also has several fatal disadvantages: first, it requires soft metal materials, such as copper, which may not be suitable for the medium of the heat exchanger, and because of the potential difference, it may cause galvanic corrosion; second, the plugging is unreliable and is not applicable when the operating temperature is high and the shell side pressure is higher than the tube side pressure. Moreover, whether it is welding plugging or conical plugging, it is difficult to disassemble, and it is very difficult to replace the plug or plugging method. Utility Model Content

[0006] The purpose of the utility model is to design a detachable quick leak-plugging joint for heat exchange tubes which can reliably plug and easily install and disassemble, in view of the inconvenience of operation of the existing welding type heat exchange tube plugging technology and the low reliability of the plugging type leak-plugging technology, as well as the inconvenience of disassembly and replacement of both.

[0007] The technical solution adopted by the utility model is:

[0008] A detachable quick leak-proof joint for a heat exchange tube, characterized in that it comprises a core rod 1, an O-shaped sealing ring 2, an inner sleeve 3, an expansion tube 4, a top screw tube 5 and a fastening nut 6; one end of the core rod 1 is in a T-shaped structure, the T-shaped end is provided with an annular groove for the front end boss of the inner sleeve 3 to be inserted, the other end of the core rod 1 is provided with an operating surface for driving its rotation, the O-shaped sealing ring 2 is sleeved on the front end of the inner sleeve 3 and deforms under the extrusion of the T-shaped end face of the core rod 1 and the end face of the inner sleeve 3 to seal the inner cavity of the heat exchange tube 8; the rear end of the inner sleeve 3 is in a conical structure; one end of the expansion tube 4 is in a petal-like structure that can be opened, and the petal-like structure is opened and pressed against the inner wall of the heat exchange tube after cooperating with the conical structure of the inner sleeve 3, the other end of the expansion tube 4 is provided with an internal thread, the internal thread is matched with the external thread of the top screw tube 5, the internal thread of the top screw tube 5 is matched with the external thread on the core rod 1, and the fastening nut 6 is screwed onto the external thread of the core rod 1.

[0009] The front end of the core rod is provided with a T-shaped end, and an annular groove is provided at the back of the T-shaped end and the matching position of the inner sleeve. The front end of the inner sleeve is provided with a boss, and a groove for installing an O-shaped sealing ring is provided on the boss. The boss at the front end of the inner sleeve can extend into the annular groove on the back of the T-shaped end. The O-shaped sealing ring is sleeved on the boss at the front end of the inner sleeve. In the free state, the T-shaped end and the front end boss are separated on both sides by the O-shaped sealing ring, and there is a certain gap. When there is an external force, this gap can be compressed, and the O-shaped sealing ring is squeezed and elastically deformed, but it will not be damaged. The deformed O-shaped sealing ring generates force with the core rod, the inner sleeve and the pipe wall at the same time to achieve a sealing effect.

[0010] The tail end of the expansion tube 4 is divided into four petals along the circumference, and the outer wall of the petal is processed with a circumferential anti-slip groove. One end of the expansion tube 4 located outside the heat exchange tube is provided with a mounting boss with a diameter larger than the outer tube of the heat exchange tube.

[0011] The core rod 1 , the inner sleeve 3 , the expansion tube 4 , the jackscrew tube 5 and the fastening nut 6 are metal products made of the same material as the heat exchange tube 8 .

[0012] The O-shaped sealing ring 2 is a flexible non-metal that can be compressed and deformed and has good elasticity, such as PTFE, fluororubber, and polyurethane products. They must have no adverse reactions in the heat exchange medium and can be used for a long time.

[0013] The operating surface at one end of the core rod 1 is a small hexagonal surface or other multi-plane structure that can be operated with a wrench or a socket.

[0014] The beneficial effects of the utility model are:

[0015] The detachable quick leak-plugging joint structure of the utility model can realize bidirectional sealing, can provide reliable sealing for the heat exchange tubes of the tubular heat exchanger, has a simple structure, is easy to install and disassemble, and can be reused, so it is convenient for further maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the existing heat exchanger welding plugging structure;

[0017] Figure 2 It is a schematic diagram of the existing heat exchanger tapered plug sealing structure;

[0018] Figure 3 It is a structural schematic diagram of the utility model detachable quick leak plugging joint;

[0019] Figure 4 This is a schematic diagram of the installation process of the detachable quick leak-proof joint of the utility model;

[0020] Figure 5 The utility model is a schematic diagram of the disassembly process of the detachable quick leak-stopping joint.

[0021] In the figure: 1-core rod; 2-○-shaped sealing ring; 3-inner casing; 4-expansion tube; 5-jackscrew tube; 6-fastening nut; 7-heat exchanger tube sheet; 8-heat exchange tube. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 3 shown.

[0024] A detachable quick leak-proof joint for a heat exchanger comprises a core rod 1, an O-shaped sealing ring 2, an inner sleeve 3, an expansion tube 4, a jacking screw tube 5 and a fastening nut 6; the O-shaped sealing ring 2 is mounted on the inner sleeve 3, the expansion tube 4 is provided with an internal thread, the jacking screw tube 5 is provided with an external thread, the jacking screw tube 5 is threadedly connected with the expansion tube 4, the inner sleeve 3 and the jacking screw tube are connected with the core rod 1 in a sling-like manner, and the fastening nut 6 is threadedly connected with the core rod 1. The front end of the core rod 1, the front end of the inner sleeve 3 and the O-shaped sealing ring 2 form a sealing structure. The material of the O-shaped sealing ring 2 is preferably a non-metal with flexibility, which can be compressed and deformed and has good elasticity. The front end of the core rod 1 is provided with a T-shaped end, and an annular groove is provided at the back of the T-shaped end and the matching position of the inner sleeve 3. The front end of the inner sleeve 2 is provided with a boss, and a groove for installing the O-shaped sealing ring 2 is provided on the boss. The boss at the front end of the inner sleeve 2 can extend into the annular groove on the back of the T-shaped end, and the O-shaped sealing ring 2 is sleeved on the boss at the front end of the inner sleeve 3. In the free state, the T-shaped end and the front end boss are separated on both sides by the O-shaped sealing ring 2, and there is a certain gap. When an external force acts, this gap can be compressed, and the O-shaped sealing ring 2 is squeezed and elastically deformed, but it will not be damaged. The deformed O-shaped sealing ring 2 and the core rod 1, the inner sleeve 3 and the tube wall of the heat exchange tube 8 simultaneously generate a force to achieve a sealing effect. The tail end of the core rod 1 is provided with an external thread, which is threadedly connected to the fastening nut 6; the outer wall of the inner sleeve 3 is an oblique cone structure. By controlling the tightness of the contact between the core rod 1, the inner sleeve 3, and the O-shaped sealing ring 2, the O-shaped sealing ring 2 after being installed in place can achieve a self-tightening sealing effect under the pressure on either side, that is, the greater the pressure, the better the sealing. The tightening nut 6, the expansion tube 4, the top screw tube 5 and the inner sleeve 3 form a locking structure. The tail end of the expansion tube 4 is divided into four petals along the circumference, and an anti-slip groove (circumferential groove to enhance friction) is processed on the outer wall. The front end of the expansion tube 4 is provided with a mounting boss. Figure 3 As shown, before installation, assemble the leak-proof joint of the utility model, put the O-shaped sealing ring 2 into the groove of the front end boss of the inner sleeve 3, screw the top screw pipe 5 into the expansion tube 4 at will, then put the core rod 1 into the inner sleeve 3, and then put the inner sleeve 3 into the expansion tube 4, and install the fastening nut 6 at the tail end of the core rod 1. The tail of the core rod 1 is processed with a small hexagonal head, and the installation boss end of the expansion tube 4 and the front end of the top screw pipe 5 are processed with a large hexagonal head. The fastening nut 6 is a hexagonal nut, which is convenient to use a wrench knob or fix. The materials used for the core rod 1, the inner sleeve 3, the expansion tube 4, the top screw pipe 5 and the fastening nut 6 are the same as the heat exchange tube materials; the material of the O-shaped sealing ring 2 can be PTFE, fluororubber, polyurethane, etc., and must have no adverse reactions in the heat exchange medium and can be used for a long time.

[0025] The installation steps of this utility model are as follows:

[0026] like Figure 4 shown.

[0027] (1) The leak-proof joint of the utility model is placed into the heat exchange tube 8, the mounting boss at the front end of the expansion tube 4 supports the outer end of the heat exchange tube, and the heat exchange tube 8 is limited in the heat exchanger shell by the tube sheet 7.

[0028] (2) Rotate the jack screw tube 5 outward to reserve enough space for the core rod 1 and the inner sleeve 3 to rotate outward, and then limit the jack screw tube 5 with the tightening nut 6.

[0029] (3) Use a wrench or other external tool to fix the top screw tube 4 so that it remains stationary. At this time, the expansion tube 4 that supports the outer end of the heat exchange tube 8 also remains stationary.

[0030] (4) By rotating the fastening nut 6, the core rod 1 and the inner sleeve 3 are pulled outward, and the diameters of the four petals of the expansion tube 4 continue to increase under the action of the oblique cone of the inner sleeve 3 until they contact the inner wall of the heat exchange tube 8 and continue to generate pressure. Then, the anti-slip grooves on the outer surfaces of the petals of the expansion tube 4 are used to fix them to the inner wall of the heat exchange tube 8.

[0031] (5) The front end boss of the inner sleeve 3 extends into the annular groove of the core rod 1, squeezing the O-shaped sealing ring 2 to deform and closely contact the inner wall of the heat exchange tube 8, thereby achieving the sealing of the heat exchange tube.

[0032] When fixing and sealing are achieved at the same time, it is in working state.

[0033] The disassembly steps of the utility model are as follows:

[0034] like Figure 5 shown.

[0035] First loosen the fastening nut 6, then screw the top screw 5 into the heat exchange tube 8, push the inner sleeve 3 out of the expansion tube 4, and separate it from the expansion tube 4. The petals of the expansion tube 4 rebound and there is no force acting on the inner wall of the heat exchange tube 8, so you can easily remove the leak-proof joint.

[0036] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A detachable quick leak plugging joint for heat exchange tubes, Its characteristics are: It comprises a core rod (1), an O-shaped sealing ring (2), an inner sleeve (3), an expansion tube (4), a jackscrew tube (5) and a fastening nut (6); one end of the core rod (1) is in a T-shaped structure, the T-shaped end is provided with an annular groove for inserting a front end boss of the inner sleeve (3), the other end of the core rod (1) is provided with an operating surface for driving the core rod to rotate, the O-shaped sealing ring (2) is sleeved on the front end of the inner sleeve (3) and deforms under the extrusion of the T-shaped end face of the core rod (1) and the end face of the inner sleeve (3) to transfer heat. The inner cavity of the tube (8) is sealed; the rear end of the inner sleeve (3) is in a conical structure; one end of the expansion tube (4) is in an openable petal-shaped structure, and the petal-shaped structure cooperates with the conical structure of the inner sleeve (3) and opens to tightly abut against the inner wall of the heat exchange tube; the other end of the expansion tube (4) is provided with an internal thread, and the internal thread cooperates with the external thread of the jack screw tube (5); the internal thread of the jack screw tube (5) cooperates with the external thread on the core rod (1); and the fastening nut (6) is screwed onto the external thread of the core rod (1).

2. The detachable quick leak plugging joint for heat exchange tube according to claim 1, Its characteristics are: The tail end of the expansion tube (4) is divided into four petals along the circumference, and the outer wall of the petal is processed with a circumferential anti-slip groove. The end of the expansion tube (4) located outside the heat exchange tube is provided with a mounting boss with a diameter larger than the outer tube of the heat exchange tube.

3. The detachable quick leak plugging joint for heat exchange tube according to claim 1, Its characteristics are: The core rod (1), inner sleeve (3), expansion tube (4), jacking screw tube (5) and fastening nut (6) are metal products made of the same material as the heat exchange tube (8).

4. The detachable quick leak plugging joint for heat exchange tube according to claim 1, Its characteristics are: The O-shaped sealing ring (2) is made of PTFE, fluororubber or polyurethane.

5. The detachable quick leak plugging joint for heat exchange tube according to claim 1, Its characteristics are: The operating surface at one end of the core rod (1) is a small hexagonal surface.

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