CN219995977U - Single tube Cheng Fu head type heat exchanger - Google Patents

Abstract

The utility model relates to a single-tube Cheng Fu head type heat exchanger, which comprises a shell; the head cover is connected to one end of the shell; the floating head pipe box is internally provided with a heat exchange pipe, the whole floating head pipe box is arranged in the shell, and one end of the floating head pipe box, which is close to the head cover, is provided with a medium outlet; the floating head outlet connector is connected to the medium outlet of the floating head pipe box; the method is characterized in that: the peripheral wall of one side of the shell, which is close to the head cover, is connected with a tube side outlet connector in a sealing way, an inlet of the tube side outlet connector is arranged in the shell, and an outlet of the tube side outlet connector is arranged outside the shell; the single-tube Cheng Fu head type heat exchanger further comprises an expansion assembly, one end of the expansion assembly is detachably connected with the floating head outlet connector through a first flange assembly, and the other end of the expansion assembly is detachably connected with an inlet of the tube side outlet connector through a second flange assembly. Compared with the prior art, the utility model is convenient to assemble and disassemble.

Description

Single tube Cheng Fu head type heat exchanger

Technical Field

The utility model relates to heat exchange equipment, in particular to a single-tube Cheng Fu head type heat exchanger.

Background

A heat exchanger is a device that transfers a portion of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. The heat exchanger plays an important role in chemical industry, petroleum, power, food and other industrial production, and can be used as a heater, a cooler, a condenser, an evaporator, a reboiler and the like in the chemical industry, so that the heat exchanger has wide application range.

The heat exchanger may be classified into a floating head type heat exchanger, a fixed tube plate type heat exchanger, a U-shaped tube plate type heat exchanger, a plate type heat exchanger, etc. according to the structure. The fixed tube-plate heat exchanger is structurally characterized in that a tube bundle is arranged in a shell, two ends of the tube bundle are used for fixing tubes on tube plates by welding or expansion joint, the tube plates at the two ends are directly welded with the shell, inlet and outlet tubes of a shell pass are directly welded on the shell, the outer circumference of the tube plate is fastened with a seal head flange by bolts, the inlet and outlet tubes of the tube pass are directly welded with the seal head, and a plurality of baffle plates are arranged in the tube bundle according to the length of the heat exchange tubes. The tube side of the heat exchanger can be divided into any number of passes by a partition plate. The tube plate at one end of the floating head type heat exchanger is fixed with the shell, the tube plate at the other end can float freely in the shell, and the shell and the tube bundle are free to expand, so that when the temperature difference between the two mediums is large, no temperature difference stress is generated between the tube bundle and the shell.

The single tube Cheng Fu head type heat exchanger has the advantages of a fixed tube plate heat exchanger and a common floating head type heat exchanger, is suitable for working conditions such as large tube shell side temperature difference, easy blockage of heat exchange tubes due to solid particles in a medium, and the like, and can be extracted and cleaned, so that the single tube Cheng Fu head type heat exchanger is widely applied to devices such as coal chemical industry, methanol and the like.

In the existing single-tube Cheng Fu head type heat exchanger, in order to realize the integral disassembly of the tube bundle and facilitate the hydrostatic test, the floating head end is required to be provided with a plurality of groups of bolt-nut connection joints. The connecting structure is complex and inconvenient to assemble and disassemble. In addition, the joint is positioned in the shell, and can not be connected through a stud and a double nut due to the structure, but only one flange can be provided with a threaded hole, one end of the stud is screwed into the threaded hole, and the other end of the stud is connected by a nut tightening method. This tends to lead to two problems:

(1) Compared with the bolt holes, the threaded holes have higher centering requirements on the matched flanges, and the small radial or circumferential dislocation in the assembly process can possibly lead to the failure of smooth installation;

(2) Because the threaded hole is positioned in the shell, the threaded hole is easy to rust due to the long-term effect of corrosive media in the shell, so that the stud can not be unscrewed during maintenance, and sometimes even the stud can be damaged for disassembly. The broken end of the stud is clamped into the threaded hole and cannot be discharged, so that the flange of the threaded hole is scrapped.

Taking the existing patent of the utility model of a novel single tube side floating head heat exchanger (application number 201420591577.X, grant number CN 204202439U) as an example, a pair of connecting structures, namely a flange and a clamping plate, are required to be arranged at the tail end of a floating head outlet connector for realizing the purpose of drawing a tube bundle. In addition, the joint is located inside the shell, the expansion joint is arranged on the shell side outlet connecting pipe, and due to structural reasons, the flange and the clamping plate cannot be connected by adopting a stud-double nut, but only a threaded hole can be formed in the flange, one end of the stud is screwed into the threaded hole, and the other end of the stud is screwed up by using the nut. Compared with the bolt hole, the threaded hole has higher alignment requirement on the matched flange, and the small radial or circumferential dislocation in the assembly process can possibly lead to the failure of smooth installation, so that the circumferential relative position of the flange and the clamping plate needs to be continuously adjusted when the tube bundle is installed, and the stud can be normally screwed into the threaded hole, thereby consuming time and labor. In addition, because the threaded hole is located inside the shell, corrosion is easy to occur due to the long-term effect of corrosive media inside the shell, the stud can not be unscrewed during maintenance, sometimes even the stud can be detached by being damaged, even if the stud is unscrewed smoothly during maintenance, the stud is difficult to tighten during reinstallation, and the problem of leakage in the media at the side of the tube shell is very easy to occur.

For another example, the utility model patent (201320508279.5, CN 203518706U) discloses a floating head-like methanol inlet-outlet tower heat exchanger, wherein the floating head outlet is connected with the upper pipe box, and two connecting flanges are arranged at two ends of the expansion joint for realizing the purpose of disassembling the expansion joint, and two pairs of flanges are respectively formed by the two connecting flanges, the shell side shell equipment flange and the flange positioned at the tail end of the lining barrel. Due to the structural reasons, the two pairs of flanges cannot be connected by adopting a stud-double nut, but threaded holes can be formed in the shell side shell equipment flange and the tail end of the lining barrel respectively, one end of the stud is screwed into the threaded hole, and the other end of the stud is tightened by using the nut. Because the equipment shell is welded with the tube bundle, the requirements of the assembly welding process on the circumferential relative positions of the equipment shell and the tube bundle are extremely high in order to meet the installation requirements of the detachable expansion joint. Once circumferential misalignment occurs, the expansion joint can only be assembled by forcibly twisting the expansion joint, which is extremely disadvantageous to the expansion joint. In addition, the threaded hole is corroded by a tube side medium for a long time, and once rusting occurs, the stud is difficult to unscrew; sometimes even the destruction of the stud is required. The broken end of the stud is clamped into the threaded hole and cannot be discharged, so that the flange of the threaded hole is scrapped and the threaded hole is corroded and damaged. When the stud is installed again, the stud is difficult to tighten, and the problem of internal leakage is very easy to occur. And the shell side shell equipment flange and the flange positioned at the tail end of the lining barrel are respectively welded with the shell side shell and the inner cone, so that the shell side shell equipment flange and the flange positioned at the tail end of the lining barrel are difficult to replace once the threaded holes are corroded and damaged.

Accordingly, improvements in the expansion assembly and connection structure of existing heat exchangers are needed.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a single tube Cheng Fu head type heat exchanger which is convenient to assemble and disassemble.

The technical scheme adopted for solving the technical problems is as follows: a single tube Cheng Fu head heat exchanger comprising

A housing;

a head cover connected to one end of the housing;

the floating head pipe box is internally provided with a heat exchange pipe, the whole floating head pipe box is arranged in the shell, and one end of the floating head pipe box, which is close to the head cover, is provided with a medium outlet;

the floating head outlet connector is connected to the medium outlet of the floating head pipe box;

the method is characterized in that: the peripheral wall of one side of the shell close to the head cover is connected with a tube side outlet connector in a sealing manner, an inlet of the tube side outlet connector is arranged in the shell, and an outlet of the tube side outlet connector is arranged outside the shell;

the single-tube Cheng Fu head type heat exchanger further comprises an expansion assembly in a bent shape, one end of the expansion assembly is detachably connected with the floating head outlet connector, and the other end of the expansion assembly is detachably connected with the inlet of the tube side outlet connector.

As an improvement, the expansion assembly comprises an elbow in communication with the inlet of the tube side outlet fitting.

Preferably, the bent pipe is a bent pipe with an included angle of 90 degrees between the inlet and the outlet.

In order to facilitate compensation of the displacement produced by the cartridge Cheng Wencha, the expansion assembly preferably further comprises an expansion joint communicating the floating head outlet connector with the elbow.

The bent pipe can be formed by not selecting an included angle of 90 degrees between the inlet and the outlet, the bending angle of the bent pipe only needs to meet the whole requirement, and the inlet and the outlet of the expansion assembly are perpendicular.

In order to make the expansion assembly detachable and facilitate maintenance or replacement of the expansion joint, preferably, the floating head outlet joint is a first flange, one end of the expansion assembly is provided with a second flange, and the first flange and the second flange are detachably connected through one or more groups of stud nuts; the expansion assembly is characterized in that a third flange is arranged at the other end of the expansion assembly, a fourth flange is arranged at the inlet of the tube side outlet joint, and the third flange and the fourth flange are detachably connected through one or more groups of stud nuts.

In order to allow the expansion assembly to rotate slightly relative to the floating head outlet joint and the tube side outlet joint, preferably, the second flange and/or the third flange are loose sleeve flanges, so that the relative positions of the first flange and the second flange can be conveniently adjusted, the sealing surfaces of the first flange and the second flange are ensured to be parallel, and/or the relative positions of the third flange and the fourth flange can be conveniently adjusted, the sealing surfaces of the third flange and the fourth flange are ensured to be parallel, the reliability of the sealing surfaces is ensured, torsion of the expansion joint caused by forced assembly can be avoided, and the expansion joint is effectively protected.

The head cover can be directly welded at one end of the shell, a manhole can be arranged on the head cover at the moment, and the size of the manhole meets the requirement that the expansion assembly can freely enter and exit the shell from the manhole.

The head cover may also be removably attached to one end of the housing. When the head cover is detached, the floating head outlet connector of the floating head pipe box and the whole expansion assembly are both positioned at visible positions, on one hand, operators can check the reliability of all the connecting connectors in the whole pipe side hydraulic test process, and on the other hand, operators can simply align when installing the floating head outlet connector and the expansion assembly of the heat exchanger, so that the installation difficulty is reduced.

In order to make the detachable connection structure between the housing and the head cover have both operational convenience and installation reliability, it is preferable that one end of the housing is provided with a fifth flange, the inside of the head cover is provided with a sixth flange, and the fifth flange and the sixth flange are detachably connected through one or more groups of stud nuts.

Compared with the prior art, the utility model has the advantages that: the tube side outlet joint is arranged on the side wall of the shell and is not connected to the head cover; an operator can see the connection part of the floating head outlet connector and the expansion assembly from the head cover, so that the floating head outlet connector and the expansion assembly can be conveniently assembled and disassembled; through being the expansion assembly of buckling form and communicating floating head outlet connection and locating the tube side outlet connection on the casing lateral wall, can dismantle the skull, also can get into the casing with expansion assembly from the skull department, be convenient for install and dismantle, improve packaging efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a single tube Cheng Fu head heat exchanger according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an expansion assembly according to a first embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a single tube Cheng Fu head heat exchanger according to a second embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in further detail below.

Example 1

As shown in fig. 1 and 2, a preferred embodiment of the present utility model is shown. The single tube Cheng Fu head heat exchanger in the embodiment comprises a shell 1, a head cover 2, a floating head tube box 3 and an expansion assembly 4 which is bent. Wherein the casing 1 is a hollow tubular body, the head cover 2 is connected to one end of the casing 1, the other end of the casing 1 is generally connected to a tail cover or a rear pipe box, and the floating head pipe box 3 and the expansion assembly 4 are integrally located inside the casing 1.

The head cover 2 is detachably attached to one end of the housing 1. A fifth flange 13 is arranged at one end of the shell 1, a sixth flange 21 is arranged at the inner side of the head cover 2, and the fifth flange 13 and the sixth flange 21 are detachably connected through a plurality of groups of studs and double nuts; in this embodiment, the head cover 2 has a hollow semi-spherical cylindrical structure, and in other embodiments, the head cover 2 may be a flat cover.

The inside heat exchange tube that is equipped with of floating head pipe case 3 for the heat transfer medium circulation, the one end that floating head pipe case 3 is close to skull 2 is equipped with the medium export, and this medium exit is connected with floating head outlet connection 31, and floating head outlet connection 31 is first flange.

The expansion assembly 4 in a bent shape comprises an expansion joint 42 and an elbow 41, a second flange 43 which is matched and connected with the first flange is arranged at the first end of the expansion joint 42, and the first flange and the second flange 43 are detachably connected through a plurality of groups of studs and double nuts, so that the first end of the expansion joint 42 is detachably communicated with the floating head outlet joint 31. The bent pipe 41 is a bent pipe with an included angle of 90 degrees between an inlet and an outlet, and the inlet of the bent pipe 41 is welded with the second end of the expansion joint 42; the outlet of the elbow 41 is provided with a third flange 44, the inlet of the tube side outlet joint 11 is provided with a fourth flange 12, and the fourth flange 12 and the third flange 44 are detachably connected through a plurality of groups of stud-double nuts, so that the second end of the expansion joint 42 is communicated with the inlet of the tube side outlet joint 11 through the elbow 41, and the floating head outlet joint 31 is communicated with the inlet of the tube side outlet joint 11 through the expansion assembly 4.

In this embodiment, the second flange 43 and the third flange 44 are loose flanges, so that the expansion assembly 4 can rotate slightly relative to the floating head outlet joint 31 and the tube side outlet joint 11, so as to adjust the relative positions of the first flange and the second flange 43 and the third flange 44 and the fourth flange 12, ensure that the sealing surfaces of the first flange and the second flange 43 are parallel, ensure that the sealing surfaces of the third flange 44 and the fourth flange 12 are parallel, ensure the reliability of the sealing surfaces, and also avoid torsion of the expansion joint 42 caused by forced assembly, and effectively protect the expansion joint 42. Since the first end of the expansion joint 42 is detachably connected with the floating head outlet joint 31, the inlet of the tube side outlet joint 11 is detachably connected with the outlet of the elbow 41, so that the whole expansion assembly 4 is detachable, and the expansion joint 42 is convenient to repair or replace.

When the single tube Cheng Fu head heat exchanger in this embodiment is assembled, the head cover 2 is opened, the expansion assembly 4 is pushed into the housing 1, the first flange and the second flange 43 are connected by a plurality of sets of stud-double nuts, and the fourth flange 12 and the third flange 44 are connected by a stud-double nut structure. The second flange 43 is a loose flange, and in the assembly process, the expansion assembly 4 can rotate around the axis of the second flange 43 by a small margin to adjust the relative position of the third flange 44 and the fourth flange 12, so that the sealing surfaces of the third flange 44 and the fourth flange 12 can be ensured to be parallel without forcibly twisting the expansion joint 42, and the purposes of ensuring reliable sealing and effectively protecting the expansion joint 42 are achieved. The third flange 44 is a loose flange, and the fourth flange 12 is connected with the shell 1 through the tube side outlet joint 11 into a whole, so that the flange plate connected with the third flange 44 can be rotated by a small margin, the bolt holes connected with the third flange 44 and the fourth flange 12 are not misplaced, the reliability of flange connection is ensured, and the installation is convenient.

After the installation, the shell side is kept in an open state without installing the head cover 2, the hydraulic test can be independently carried out on the pipe side, and operators can conveniently check the tightness of each connecting joint. And after the hydrostatic test is qualified, connecting the head cover 2 with the shell 1 through bolts and nuts.

The order of disassembly of the heat exchangers is the reverse of the order of installation.

When the shell 1, the expansion assembly 4 and the floating head pipe box 3 are assembled, the head cover 2 is disassembled to enable the connection part of the expansion assembly 4 and the floating head outlet joint 31 and/or the pipe side outlet joint 11 to be in a visible position, and an operator can check the reliability of all the connection joints in the whole pipe side hydrostatic test process.

Example two

As shown in fig. 3, another preferred embodiment of the present utility model is different from embodiment 1 in that: the shell 1 and the head cover 2 are connected through welding, and the head cover 2 is provided with a manhole 22, wherein the size of the manhole 22 is enough for the expansion assembly 4 to freely enter and exit the shell 1 from the manhole 22.

Claims (10)

1. A single tube Cheng Fu head heat exchanger comprising

A housing (1);

a head cover (2) connected to one end of the housing (1);

the floating head pipe box (3) is internally provided with a heat exchange pipe, the floating head pipe box (3) is integrally arranged in the shell (1), and one end of the floating head pipe box (3) close to the head cover (2) is provided with a medium outlet;

the floating head outlet connector (31) is connected to the medium outlet of the floating head pipe box (3);

the method is characterized in that: the peripheral wall of one side, close to the head cover, of the shell (1) is connected with a tube side outlet connector (11) in a sealing mode, an inlet of the tube side outlet connector (11) is arranged in the shell (1), and an outlet of the tube side outlet connector (11) is arranged outside the shell (1);

the single-tube Cheng Fu head type heat exchanger further comprises an expansion assembly (4) which is bent, one end of the expansion assembly (4) is detachably connected with the floating head outlet connector (31), and the other end of the expansion assembly (4) is detachably connected with the inlet of the tube side outlet connector (11).

2. A single tube Cheng Fu head heat exchanger according to claim 1, wherein: the expansion assembly (4) comprises an elbow (41) in communication with the inlet of the tube side outlet fitting (11).

3. A single tube Cheng Fu head heat exchanger according to claim 2, wherein: the bent pipe (41) is a bent pipe with an included angle of 90 degrees between an inlet and an outlet.

4. A single tube Cheng Fu head heat exchanger according to claim 2, wherein: the expansion assembly (4) further comprises an expansion joint (42) which is communicated with the floating head outlet joint (31) and the elbow pipe (41).

5. A single tube Cheng Fu head heat exchanger according to claim 2, wherein: the inlet and the outlet of the expansion assembly (4) are vertical.

6. A single tube Cheng Fu head heat exchanger according to claim 1, wherein: the floating head outlet joint (31) is a first flange, one end of the expansion assembly (4) is provided with a second flange (43), and the first flange and the second flange (43) are detachably connected through one or more groups of stud nuts; the other end of the expansion assembly (4) is provided with a third flange (44), the inlet of the tube side outlet joint (11) is provided with a fourth flange (12), and the third flange (44) and the fourth flange (12) are detachably connected through one or more groups of stud nuts.

7. A single tube Cheng Fu head heat exchanger according to claim 6, wherein: the second flange (43) and/or the third flange (44) are loose flange.

8. A single tube Cheng Fu head heat exchanger according to claim 1, wherein: the head cover (2) is welded at one end of the shell (1); the manhole (22) is arranged on the head cover (2), and the size of the manhole (22) meets the requirement that the expansion assembly (4) can freely enter and exit the shell (1) from the manhole (22).

9. A single tube Cheng Fu head heat exchanger according to claim 1, wherein: the head cover (2) is detachably connected to one end of the shell (1).

10. A single tube Cheng Fu head heat exchanger according to claim 9, wherein: one end of the shell (1) is provided with a fifth flange (13), the inner side of the head cover (2) is provided with a sixth flange (21), and the fifth flange (13) and the sixth flange (21) are detachably connected through one or more groups of stud nuts.