CN219607787U - Shell-and-tube heat exchanger - Google Patents

Abstract

The utility model provides a shell-and-tube heat exchanger, and relates to the technical field of chemical equipment. The shell-and-tube heat exchanger comprises a shell, an upper tube box, a lower tube box and a sealing device, wherein a tube plate is arranged between the shell and the upper tube box as well as between the shell and the lower tube box, a plurality of through holes with stepped parts are formed in the tube plate, and two ends of a plurality of heat exchange tubes respectively penetrate through the corresponding through holes and are communicated with the upper tube box and the lower tube box. The sealing device comprises a compression ring and a sealing gasket which are connected to the outer side of the heat exchange tube in a surrounding mode, the sealing gasket is clamped on one side, far away from the shell, of the step portion, the heat exchange tube is preliminarily fixed and sealed relative to the tube plate, the compression ring is connected with one end, far away from the shell, of the through hole, the compression ring is abutted to the step portion through the sealing gasket, the sealing gasket is extruded, and the heat exchange tube is sealed relative to the tube plate again. Through the arrangement, excessive clamping force is not required to be applied to the heat exchange tube, the tightness of the joint of the heat exchange tube and the tube plate can be ensured, and corrosive mediums in the upper tube box and the lower tube box are prevented from leaking into the shell.

Description

Shell-and-tube heat exchanger

Technical Field

The utility model relates to the technical field of chemical equipment, in particular to a shell-and-tube heat exchanger.

Background

In the chemical industry field, heat exchangers are commonly used for exchanging heat for corrosive mediums, so that the physical form of the heat exchanger is changed, and a heat exchange tube filled with the corrosive mediums needs to be made of nonmetallic materials such as glass, ceramic and the like. For example, high-temperature strong corrosion steam is introduced into a glass heat exchange tube arranged in heat exchange equipment, and the glass heat exchange tube is placed in cold air, so that a hot strong corrosive medium is condensed into liquid after being cooled.

In this case, since the material of the nonmetallic material such as glass or ceramic is brittle, the glass heat exchange tube cannot be applied with an excessive clamping force when being connected with the tube plate, but if a gap exists between the glass heat exchange tube and the tube plate, corrosive medium in the pipe is leaked.

Disclosure of Invention

The utility model aims to overcome the defect that in the prior art, a gap exists between a glass heat exchange tube in a heat exchanger and a tube plate, so that corrosive medium in a pipeline leaks.

The utility model solves the technical problems by the following technical scheme:

the shell-and-tube heat exchanger comprises a shell, an upper tube box and a lower tube box, wherein a tube plate is arranged between the shell and the upper tube box as well as between the shell and the lower tube box, a plurality of through holes are formed in the tube plate, step parts are arranged in the through holes, and two ends of a plurality of heat exchange tubes respectively penetrate through the corresponding through holes and are communicated with the upper tube box and the lower tube box; the shell-and-tube heat exchanger further comprises a sealing device, the sealing device comprises a compression ring and a sealing gasket which are connected with the outer side of the heat exchange tube in a surrounding mode, the sealing gasket is clamped on one side, far away from the shell, of the step portion, the compression ring is connected with one end, far away from the shell, of the through hole, and the compression ring is abutted to the step portion through the sealing gasket.

In this scheme, through seting up a plurality of through-holes on the tube sheet, the heat transfer pipe passes through the through-hole intercommunication upper tube case and the lower tube case of corresponding seting up, and is provided with step portion in the inside of through-hole, keeps away from one side of casing with sealed pad joint in step portion, carries out preliminary fixed seal to the heat transfer pipe, and the one end that the casing was kept away from to reuse clamping ring and through-hole is connected, and through sealed pad butt in step portion, realizes the further extrusion to sealed pad. Through the arrangement, excessive clamping force is not required to be applied to the heat exchange tube, the tightness of the joint of the heat exchange tube and the tube plate can be ensured, and corrosive mediums in the upper tube box and the lower tube box are prevented from leaking into the shell.

Preferably, one end of the through hole, which is far away from the shell, is connected with the outer surface of the compression ring through threaded fit.

In this scheme, through screw-thread fit's mode for the clamping ring can the zonulae occludens in the one end of through-hole, and realizes reciprocating in the through-hole, and more makes things convenient for the clamping ring to pass through sealed pad butt and step.

Preferably, the pressing ring is provided with a protruding part in a surrounding manner, and the protruding part extends outwards along the radial direction of the pressing ring and is positioned on one side of the surface of the tube plate away from the shell; the sealing device further comprises a gasket, the gasket is arranged on the surface, far away from the shell, of the tube plate, and the protruding part is abutted to the tube plate through the gasket.

In the scheme, when the compression ring is abutted to the step part through the sealing gasket, the protruding part can be abutted to the surface of the tube plate through the gasket, and when the compression ring is in threaded connection with the through hole, leakage caused by gaps at the threaded connection part can be prevented; on the other hand, the gasket can play a certain buffering role on the pressing ring, so that the convex part of the pressing ring is prevented from being directly abutted on the tube plate, and abrasion is caused after the pressing ring is used for a long time.

Preferably, the radial dimension of the heat exchange tube at the end is greater than the radial dimension of the heat exchange tube at the middle section, and the radial dimension of the heat exchange tube at the end is greater than the inner diameter dimension of the compression ring.

In this scheme, the clamping ring encircles the middle section that sets up at the heat exchange tube, and the heat exchange tube is greater than the heat exchange tube simultaneously at the radial dimension of middle section and the internal diameter size of clamping ring for the tip of heat exchange tube can direct butt at the tip of clamping ring, further fixes the heat exchange tube, prevents that the heat exchange tube from producing to remove and causing the leakage.

Preferably, the end part of the heat exchange tube and the middle section of the heat exchange tube form curved surface transition, and are abutted to the compression ring at the transition joint.

In this scheme, utilize the curved surface transition of heat exchange tube tip and middle section for the curved surface butt of transition forms the line contact on the clamping ring between with the clamping ring, for the tip direct butt of heat exchange tube at the tip of clamping ring, can prevent simultaneously that the heat exchange tube from producing axial motion and radial motion for the through-hole, fixed effect is better.

Preferably, the pressing ring is provided with a connecting part, the connecting part is arranged on the end surface of the pressing ring far away from the shell and extends towards the direction far away from the end surface, the connecting part and the pressing ring are coaxially arranged, the inner diameter size of the connecting part is larger than that of the pressing ring, and the inner surface of the connecting part is provided with an annular groove; the sealing device further comprises a glass fiber rope, wherein the glass fiber rope is arranged on the outer side of the heat exchange tube in a surrounding mode and is clamped in the annular groove.

In this scheme, extend on the terminal surface that the casing was kept away from to the clamping ring and be provided with connecting portion, connecting portion and the coaxial setting of clamping ring, and the internal diameter size of connecting portion is greater than the internal diameter size of clamping ring, and annular groove sets up in the internal surface of connecting portion, sets up glass fiber rope between annular groove and heat exchange tube, plays the effect of further fixed and protection heat exchange tube.

Preferably, the sealing device further comprises a sealing ring, the sealing ring is connected to the outer side of the heat exchange tube in a surrounding mode, the sealing ring is arranged between the sealing gasket and the pressing ring, and the hardness of the sealing ring is larger than that of the sealing gasket.

In the scheme, the pressing ring, the sealing gasket and the stepped part of the tube plate form a hard and soft structure, the sealing ring bears the force of the pressing ring and is transmitted to the sealing gasket, and the sealing gasket is further pressed and deformed to form sealing with the stepped part and the heat exchange tube.

Preferably, the shell-and-tube heat exchanger further comprises a plurality of support plates, wherein the plurality of support plates are arranged in the shell and are sequentially arranged along the extending direction of the shell; and a part of the outer peripheral edges of the supporting plates are connected to the inner wall of the shell, a gap is formed between the outer peripheral edges of the other parts of the supporting plates and the inner wall of the shell, and each heat exchange tube penetrates through the supporting plate at the corresponding position.

In this scheme, through setting up a plurality of backup pads in the inside of casing, a plurality of backup pads are arranged in proper order along the extending direction of casing in the inside of casing, can increase the inside medium of casing and heat exchange tube's area of contact and contact time, further improve the efficiency of heat transfer.

Preferably, the shell, the inner surfaces of the upper pipe box and the lower pipe box, the surface of the pipe plate and the inside of the through hole formed in the pipe plate are all covered with corrosion-resistant materials.

In this scheme, through setting up corrosion-resistant material, not only the inside corrosive medium that can let in of heat exchange tube, also can let in corrosive heat exchange medium in the inside of casing. Compared with the traditional shell-and-tube heat exchanger, the shell-and-tube heat exchanger has the advantages that corrosive media cannot be introduced into the shell, and the application range of the shell-and-tube heat exchanger is further expanded on the premise that the heat exchange tube and the tube plate are sealed.

Preferably, the corrosion-resistant material is polytetrafluoroethylene.

In the scheme, in the chemical field, the temperature tolerance of polytetrafluoroethylene can reach about 160 ℃, the general low-temperature heat exchange occasion can be met, the cost is low, the materials are available conveniently, and the polytetrafluoroethylene is a better choice of corrosion-resistant medium.

The utility model has the positive progress effects that:

the heat exchange tube is communicated with the upper tube box and the lower tube box through holes formed in the tube plates, so that medium circulation in the upper tube box and the lower tube box is realized. A step part is arranged in the through hole, and the sealing gasket is clamped to realize the first sealing of the heat exchange tube relative to the tube plate; a sealing ring is tightly arranged on the sealing gasket to form a second sealing structure; the third sealing of the heat exchange tube relative to the tube plate is realized by arranging a compression ring to be connected with one end of the through hole far away from the shell, and abutting the sealing ring and the sealing gasket on the step part and further extruding the sealing gasket; then a gasket is inserted between the convex part extending radially of the compression ring and the tube plate to form a fourth sealing structure; finally, a glass fiber rope is arranged in the annular groove of the connecting part, and a fifth sealing structure is formed between the compression ring and the heat exchange tube. Through the arrangement, excessive clamping force is not required to be applied to the heat exchange tube, the tightness of the joint of the heat exchange tube and the tube plate can be fully ensured, and corrosive mediums in the upper tube box and the lower tube box are prevented from leaking into the shell.

Drawings

Fig. 1 is a schematic overall sectional view of a shell-and-tube heat exchanger according to an embodiment of the present utility model.

FIG. 2 is a schematic partial cross-sectional view of a heat exchange tube and tube sheet and sealing device after assembly in accordance with an embodiment of the present utility model.

FIG. 3 is a schematic partial cross-sectional view of a tubesheet according to an embodiment of the present utility model.

FIG. 4 is a schematic cross-sectional view of a press ring according to an embodiment of the utility model.

Reference numerals illustrate:

housing 100

Shell side media inlet 110

Shell side media outlet 120

Upper pipe box 200

Tube side media outlet 220

Down pipe box 300

Tube side medium inlet 320

Upper tube sheet 400

Through hole 410

Step 420

Lower tube plate 500

Heat exchange tube 600

Compression ring 710

Protrusion 711

Connection portion 712

Annular groove 7120

Gasket 720

Gasket 730

Glass fiber rope 740

Seal ring 750

Support plate 800

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The embodiment provides a shell-and-tube heat exchanger, which is applied to the technical field of chemical equipment. As shown in fig. 1, the shell-and-tube heat exchanger mainly comprises a shell 100, an upper tube box 200 and a lower tube box 300, wherein the top and the bottom of the shell 100 are in an opening structure, a shell side medium inlet 110 and a shell side medium outlet 120 are arranged on the surface of the shell 100, the bottom of the upper tube box 200 and the top of the lower tube box 300 are also in an opening structure, an exhaust port and a tube side medium outlet 220 are arranged on the upper tube box 200, and a clean outlet and a tube side medium inlet 320 are arranged on the lower tube box 300.

In addition, an upper tube plate 400 is disposed between the bottom of the upper tube box 200 and the top of the housing 100, the upper tube box 200 and the housing 100 are connected and fixed by using the upper tube plate 400, a lower tube plate 500 is disposed between the top of the lower tube box 300 and the bottom of the housing 100, and the lower tube box 300 and the housing 100 are connected and fixed by using the lower tube plate 500, and a specific fixed connection manner is a prior art and will not be described herein. The upper tube plate 400 and the lower tube plate 500 are respectively provided with a plurality of through holes 410, the through holes 410 are structured as shown in fig. 3, heat exchange tubes 600 are arranged between the through holes 410 at corresponding positions of the upper tube plate 400 and the lower tube plate 500 in a penetrating way, the heat exchange tubes 600 are fixed, the heat exchange tubes 600 are made of glass, the structure is a tubular structure with hollow inside, the top ends of the heat exchange tubes 600 extend out of the upper tube plate 400, the bottom ends of the heat exchange tubes 600 extend out of the lower tube plate 500, and the upper tube box 200 and the lower tube box 300 are communicated.

When the high-temperature corrosive medium enters the lower tube box 300 through the tube side medium inlet 320 on the lower tube box 300, the high-temperature corrosive medium enters the inside of the heat exchange tubes 600 and passes through the inner cavities of the heat exchange tubes 600 from bottom to top, in the process, the heat exchange medium enters the shell 100 through the shell side medium inlet 110 on the shell 100 to be in contact with the heat exchange tubes 600 in the shell 100, and exchanges heat with the high-temperature corrosive medium in the heat exchange tubes 600, for example, the high-temperature corrosive medium is cooled to be liquefied, the liquefied high-temperature corrosive medium flows into the lower tube box 300 along the heat exchange tubes 600, can be discharged through the discharge port on the lower tube box 300, the rest of non-liquefied corrosive medium can be discharged to other devices through the tube side medium outlet 220 on the upper tube box 200, and the heat exchange medium is discharged from the shell side medium outlet 120 on the shell 100.

In this embodiment, a plurality of through holes 410 are formed at corresponding positions on the upper tube plate 400 and the lower tube plate 500, step portions 420 are formed inside the plurality of through holes 410, and two ends of the plurality of heat exchange tubes 600 are respectively disposed through the corresponding through holes 410 and are communicated with the upper tube box 200 and the lower tube box 300. As shown in fig. 2 and 3, the inside of the through hole 410 is extended inward in the radial direction to form a stepped portion 420, the inner surface of the stepped portion 420 is of a smooth hole structure, and the inner diameter of the stepped portion 420 is the same as the middle diameter of the heat exchange tube 600, so that the heat exchange tube 600 can pass through the through hole 410 on the tube plate, and the heat exchange tube 600 can be initially positioned and fixed by using the stepped portion 420. The lower surface of the stepped portion 420 is flush with the end surface of the tube sheet near the shell 100 so that the inside of the through hole 410 is provided in a stepped-like structure. Of course, in other embodiments, the step 420 is provided entirely as desired, and may be provided at any position inside the through hole 410, as long as it can form a step with an end of the through hole 410 remote from the housing 100.

In this embodiment, the shell-and-tube heat exchanger further comprises a sealing device, wherein the sealing device comprises a compression ring 710, a sealing gasket 720, a sealing ring 750, a gasket 730 and a glass fiber rope 740 which are connected around the outer side of the heat exchange tube 600.

As shown in fig. 2, 3 and 4, the sealing pad 720 is clamped at one side of the step portion 420 away from the housing 100, and one end of the through hole 410 away from the housing 100 is connected with the outer surface of the pressing ring 710 through screw fit, and abuts against the step portion 420 through the sealing pad 720. Specifically, the inner diameter of the sealing pad 720 is the same as the outer diameter of the heat exchange tube 600, the outer diameter of the sealing pad 720 is the same as the diameter of the through hole 410, the height is 5 mm, the sealing pad 720 is a non-metal ring pad, and one or more structures of polytetrafluoroethylene material, flexible graphite material, silica gel and rubber are adopted, so that the service life is long. By the structural arrangement of the sealing gasket 720, the sealing gasket 720 can be caught at the side of the stepped portion 420 away from the housing 100.

An internal thread structure is provided at one end of the through hole 410 far away from the casing 100, an external thread structure is provided on the outer surface of the press ring 710, the inner diameter of the section of the press ring 710 provided with external threads is greater than the outer diameter of the joint with the heat exchange tube 600 by 4 mm to 6 mm, the thickness dimension is specifically 5 mm in the embodiment, the height dimension is 6 mm to 8 mm, specifically 6 mm in the embodiment, and the press ring 710 can move in the through hole 410 in a threaded connection manner and is abutted on the step part 420, so that further extrusion of the sealing gasket 720 is realized. With this arrangement, excessive clamping force is not required to be applied to the heat exchange tube 600, and the sealing property of the joint between the heat exchange tube 600 and the tube sheet can be ensured, so that the corrosive medium in the upper tube box 200 and the lower tube box 300 is prevented from leaking into the casing 100.

Of course, in other embodiments, the end of the through hole 410 away from the housing 100 and the pressing ring 710 may be connected in other manners, so long as the pressing ring 710 can be connected inside the through hole 410 and can abut against the step 420. For example, a clamping hole may be formed in the through hole 410, and a clamping portion may be formed on an outer surface of the pressing ring 710, such that the clamping portion and the clamping hole are matched with each other, and the pressing ring 710 may abut against the step 420 at the matched position. However, compared with other connection modes, the compression ring 710 can be tightly connected to one end of the through hole 410 by means of threaded fit, and can move up and down in the through hole 410, and the compression ring 710 can be abutted against the step part 420 through the sealing pad 720 more conveniently.

Further, a seal ring 750 is provided between the seal 720 and the pressing ring 710, and the hardness of the seal ring 750 is greater than that of the seal 720. As shown in fig. 2, the inner diameter of the sealing ring 750 is the same as the outer diameter of the heat exchange tube 600, the outer diameter of the sealing ring 750 is the same as the inner diameter of the through hole 410, and the height is 3 mm. The sealing ring 750 is a nonmetal ring gasket like the sealing gasket 720, and one or more of polytetrafluoroethylene materials, flexible graphite materials, silica gel and rubber are adopted for combination, so that the service life is long, but the hardness of the sealing ring 750 is higher than that of the sealing gasket 720, so that the pressing ring 710, the sealing ring 750, the sealing gasket 720 and the step part 420 of the tube plate form a hard, soft and hard structure, the sealing ring 750 bears the force of the pressing ring 710 to be transmitted to the sealing gasket 720, and the sealing gasket 720 is further pressed and deformed and forms sealing with the step part 420 and the heat exchange tube 600.

As shown in fig. 2 and 4, the pressing ring 710 is provided with a protrusion 711 in a surrounding manner, the protrusion 711 extends outwards along the radial direction of the pressing ring 710 and is located at one side of the surface of the tube plate away from the shell 100, the gasket 730 is disposed on the surface of the tube plate away from the shell 100, and the protrusion 711 abuts against the tube plate through the gasket 730.

Specifically, the press ring 710 is connected with the internal thread inside the through hole 410 through the external thread at the lower end, after the press ring 710 abuts against the step part 420, the protruding part 711 on the press ring 710 is located outside the through hole 410, and the protruding part 711 extends outwards along the radial direction of the press ring 710 and is located at one side of the surface of the tube plate far away from the shell 100, the protruding part 711 is used as the outer edge of the press gasket 730 on the press ring 710, and the thickness of the protruding part 711 is 5 mm. The gasket 730 is disposed on a surface of the tube plate far away from the housing 100, the protrusion 711 is abutted against the tube plate by the gasket 730, the outer diameter of the gasket 730 is the same as the outer diameter of the protrusion 711, and the inner diameter of the gasket 730 is 2 mm to 4 mm greater than the outer diameter of the section of the compression ring 710 with threads, which is specifically 3 mm in this embodiment. By providing the protrusion 711 and the spacer 730, when the pressure ring 710 is abutted against the step 420 through the seal ring 750 and the seal gasket 720, the protrusion 711 can be abutted against the surface of the tube sheet through the spacer 730, and when the pressure ring 710 is screwed with the through hole 410, leakage caused by a gap generated at the screwed connection position can be prevented; on the other hand, the gasket 730 may play a certain role in buffering the press ring 710, so as to prevent the protrusion 711 of the press ring 710 from directly abutting against the tube sheet, and from wearing after long-term use.

As shown in fig. 2 and 4, the pressure ring 710 is further provided with a connection portion 712, the connection portion 712 is disposed on an end surface of the pressure ring 710 away from the housing 100 and extends in a direction away from the end surface, the connection portion 712 and the pressure ring 710 are coaxially disposed, an inner diameter of the connection portion 712 is larger than an inner diameter of the pressure ring 710, an annular groove 7120 is formed in an inner surface of the connection portion 712, and the glass fiber rope 740 is disposed around an outer side of the heat exchange tube 600 and is clamped in the annular groove 7120.

Specifically, on the end surface of the compression ring 710 away from the housing 100, a connection portion 712 is formed by extending outward along the axial direction, the connection portion 712 is also in a circular cylindrical shape, the connection portion 712 and the compression ring 710 are coaxially disposed, the inner diameter of the connection portion 712 is larger than the inner diameter of the compression ring 710, and the thickness of the connection portion 712 is between 5 mm and 8 mm, specifically 6 mm in this embodiment. A wrench groove is provided on the outer circumferential surface of the connection part 712, and an annular groove 7120 is provided on the inner circumferential surface of the connection part 712, and a glass fiber rope 740 is circumferentially provided on the outer side of the heat exchange tube 600 and is tightly clamped in the annular groove 7120, thereby playing a role in further fixing and protecting the heat exchange tube 600.

As shown in fig. 2 and fig. 4, the radial dimension of the heat exchange tube 600 at the end is greater than the radial dimension of the heat exchange tube 600 at the middle section, and the radial dimension of the heat exchange tube 600 at the end is greater than the inner diameter dimension of the press ring 710, so that the end of the heat exchange tube 600 can be directly abutted against the end of the press ring 710 to fix the press ring 710, thereby preventing the press ring 710 from moving axially relative to the tube plate and the heat exchange tube 600. Further, the end of the heat exchange tube 600 and the middle section of the heat exchange tube 600 form a curved surface transition, and are abutted to the compression ring 710 at the transition connection, and the curved surface of the transition is abutted to the compression ring 710 in a curved surface transition mode to form line contact with the compression ring 710, so that the heat exchange tube 600 can be prevented from generating axial movement and radial movement relative to the through hole 410 relative to the surface contact between the end of the heat exchange tube 600 and the end of the compression ring 710, and the fixing effect is better.

The sealing process of the sealing device on the shell-and-tube heat exchanger in the embodiment specifically comprises the following steps:

firstly, the heat exchange tube 600 is penetrated through the plurality of through holes 410 on the tube plate, after the heat exchange tube 600 is penetrated, the sealing gasket 720 is plugged into the step part 420 in the through holes 410, and a first sealing structure is formed among the sealing gasket 720, the heat exchange tube 600 and the tube plate. And then the sealing ring 750 is plugged in, and the sealing ring 750 is tightly combined with the first sealing structure to form a second sealing structure. The press ring 710 is then screwed in, and the press ring 710 presses the seal 720 and the seal ring 750, forming a third seal structure. A gasket 730 is inserted between the protruding part 711 of the pressing ring 710 extending out of the tube plate and the tube plate, so as to form a fourth sealing structure. Finally, the glass fiber rope 740 is inserted, a fifth sealing structure is formed between the compression ring 710 and the heat exchange tube 600, and the heat exchange tube 600 is further fixed and protected. Through the arrangement, a sealing structure with good sealing performance is formed by adopting a quintuple sealing and reinforcing mode, the sealing performance between the tube plate and the heat exchange tube 600 is improved, leakage and heat loss are reduced, the structure is simple, the service life is long, the heat exchange tube 600 is easy to replace, and the heat exchange tube 600 can be effectively protected.

As shown in fig. 1, in the present embodiment, the shell-and-tube heat exchanger further includes four support plates 800, the four support plates 800 are disposed inside the housing 100 and sequentially arranged along the extending direction of the housing 100, a portion of the outer peripheral edges of the four support plates 800 are connected to the inner wall of the housing 100, a gap is formed between another portion of the outer peripheral edges of the four support plates 800 and the inner wall of the housing 100, and each heat exchange tube 600 is disposed through at least two support plates 800 at corresponding positions.

Specifically, four support plates 800 are staggered on the inner wall of the shell 100, the upper tube plate 400, the lower tube plate 500, the inner wall of the shell 100 and the four support plates 800 form a medium channel in a shape of a letter ", the shell side medium inlet 110 of the shell 100 is positioned on the upper end side wall of the shell 100, the shell side medium outlet 120 of the shell 100 is positioned on the lower end side wall of the shell 100, and a heat exchange medium enters the shell 100 through the shell side medium inlet 110, so that the contact area and contact time between the heat exchange medium inside the shell 100 and the heat exchange tube 600 can be increased by utilizing the support plates 800 in the shell 100, and the heat exchange efficiency is further improved.

In the present embodiment, the inner surfaces of the casing 100, the upper tube box 200 and the lower tube box 300, the surface of the tube sheet, and the inside of the through-hole 410 formed in the tube sheet are covered with a corrosion-resistant material having a thickness of 2 mm. With this arrangement, not only the interior of the heat exchange tube 600 but also the interior of the housing 100 may be filled with a corrosive medium. Compared with the traditional shell-and-tube heat exchanger, the shell-and-tube heat exchanger has the advantages that corrosive heat exchange medium cannot be introduced into the shell 100, and the use range of the shell-and-tube heat exchanger is further enlarged on the premise that the heat exchange tube 600 is sealed with a tube plate. Furthermore, the corrosion-resistant material is polytetrafluoroethylene, the temperature resistance of the polytetrafluoroethylene can reach about 160 ℃ in the chemical industry, the general low-temperature heat exchange occasion can be met, the cost is low, the materials are convenient to obtain, and the corrosion-resistant material is a better choice of corrosion-resistant media.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. The utility model provides a shell-and-tube heat exchanger, includes casing, goes up pipe case and lower pipe case, be provided with tube sheet, its characterized in that between casing and last pipe case, the lower pipe case:

the tube plate is provided with a plurality of through holes, step parts are arranged in the through holes, and two ends of the heat exchange tubes respectively penetrate through the corresponding through holes and are communicated with the upper tube box and the lower tube box;

the shell-and-tube heat exchanger further comprises a sealing device, the sealing device comprises a compression ring and a sealing gasket which are connected with the outer side of the heat exchange tube in a surrounding mode, the sealing gasket is clamped on one side, far away from the shell, of the step portion, the compression ring is connected with one end, far away from the shell, of the through hole, and the compression ring is abutted to the step portion through the sealing gasket.

2. The shell and tube heat exchanger as set forth in claim 1 wherein the end of the through bore remote from the housing is threadably connected to the outer surface of the pressure ring.

3. The shell-and-tube heat exchanger according to claim 2, wherein the pressure ring is provided with a bulge in a surrounding manner, the bulge extends outwards along the radial direction of the pressure ring and is positioned on the side of the surface of the tube plate away from the shell;

the sealing device further comprises a gasket, the gasket is arranged on the surface, far away from the shell, of the tube plate, and the protruding part is abutted to the tube plate through the gasket.

4. The shell and tube heat exchanger as set forth in claim 1, wherein the heat exchange tube has a radial dimension at the end that is greater than a radial dimension of the heat exchange tube at the intermediate section and the heat exchange tube has a radial dimension at the end that is greater than an inner diameter dimension of the pressure ring.

5. The shell-and-tube heat exchanger as set forth in claim 4, wherein the end of the heat exchange tube and the middle section of the heat exchange tube are in curved transition and are abutted against the compression ring at the transition joint.

6. The shell-and-tube heat exchanger according to claim 1, wherein a connecting part is arranged on the pressure ring, the connecting part is arranged on the end surface of the pressure ring far away from the shell and extends in the direction far away from the end surface, the connecting part and the pressure ring are coaxially arranged, the inner diameter size of the connecting part is larger than that of the pressure ring, and an annular groove is formed in the inner surface of the connecting part;

the sealing device further comprises a glass fiber rope, wherein the glass fiber rope is arranged on the outer side of the heat exchange tube in a surrounding mode and is clamped in the annular groove.

7. The shell and tube heat exchanger as set forth in claim 1, wherein the sealing means further comprises a sealing ring circumferentially connected to the outside of the heat exchange tube and disposed between the packing and the pressure ring, the sealing ring having a hardness greater than that of the packing.

8. The shell-and-tube heat exchanger according to claim 1, further comprising a plurality of support plates disposed inside the housing and arranged in sequence along the extending direction of the housing;

and a part of the outer peripheral edges of the supporting plates are connected to the inner wall of the shell, a gap is formed between the outer peripheral edges of the other parts of the supporting plates and the inner wall of the shell, and each heat exchange tube penetrates through the supporting plate at the corresponding position.

9. The shell and tube heat exchanger as claimed in any one of claims 1 to 8, wherein the inner surfaces of the shell, the upper and lower tube boxes, the surface of the tube sheet and the inside of the through holes formed in the tube sheet are covered with a corrosion-resistant material.

10. The shell and tube heat exchanger as set forth in claim 9 wherein the corrosion resistant material is polytetrafluoroethylene.