CN210036409U - Corrosion-resistant composite structure heat exchange tube and heat exchanger with same - Google Patents

Abstract

The application discloses corrosion-resistant composite construction heat exchange tube, this heat exchange tube include at least one section of infusing, and each section of infusing includes inner tube and the outer tube that coaxial cover was established to have certain clearance between the pipe wall of inner tube and outer tube, wherein, one in inner tube and the outer tube is the tubular metal resonator, and the other is non-metallic pipe, and it has pasty thermal interface material to fill in the clearance. The application also discloses a heat exchanger comprising the heat exchange tube. The heat exchange tube is composed of the sleeve consisting of the metal tube and the nonmetal tube, and the thermal interface material is filled in the gap of the sleeve, so that the heat exchange tube has the advantages of adapting to the corrosion characteristic of a medium and efficiently transferring heat, has better deformation performance, thermal conductivity and filling performance, and is beneficial to eliminating the thermal stress when the metal tube and the nonmetal tube are used in a compounding way.

Description

Corrosion-resistant composite structure heat exchange tube and heat exchanger with same

Technical Field

The utility model relates to a heat exchanger, especially heat exchange tube of heat exchanger. Specifically, the utility model relates to a corrosion-resistant, heat exchange tube that has composite construction.

Background

The heat exchanger is important heat exchange equipment in various industries, is quite wide in application and has obvious importance. For the application occasions of heat exchangers with corrosion, the corrosion of the heat exchanger is an important reason for the failure of the heat exchanger, so that the problem of good corrosion can be solved, namely the problem of the damage of the heat exchanger is solved, and good social benefit and economic benefit are realized.

The metal material has good thermal property, processing property and mechanical property, while the non-metal material has good corrosion resistance. However, the thermal expansion coefficients of the non-metal material and the metal material are greatly different, and the connecting process is difficult; when the two materials are used in a composite mode, stress which is mutually restricted can be generated at a thermal interface, so that the difficulty in combining the two materials for use is high. The existing conventional technology for compositely using metal and non-metal materials, such as enamel, glass lining, plastic coating and the like, cannot well solve the problem.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, it is an object of the present invention to provide a heat exchange tube of corrosion-resistant composite structure, which combines a metal material and a non-metal material to form a composite heat exchange tube having corrosion resistance, and effectively solves the problem of thermal stress generated at a thermal interface between the non-metal material and the metal material.

The utility model discloses a further purpose provides a make convenient, the reliable and stable corrosion-resistant composite construction heat exchange tube of structure.

According to an aspect of the utility model, a heat exchange tube of corrosion-resistant composite construction is provided, it includes at least one section of pouring into, and each section of pouring into includes inner tube and the outer tube that coaxial cover was established to have certain clearance between the pipe wall of inner tube and outer tube, wherein, one in inner tube and the outer tube is the tubular metal resonator, and the other is non-metallic pipe, and it has pasty thermal interface material to fill in the clearance.

In some embodiments, an annular resilient seal may be provided in the gap at the end of at least one of the irrigation sections, a groove being formed in the wall of at least one of the inner and outer tubes for receiving the resilient seal, and the resilient seal being in sealing engagement with the walls of the inner and outer tubes.

Preferably, the resilient sealing member comprises two resilient sealing members axially spaced apart and coated with a sealant at the end of the priming section.

In some embodiments, the inner tube extends beyond the outer tube at both ends of the heat exchange tube, and the heat exchange tube further comprises a first elastic expansion bladder in the shape of a ring at each end thereof, both ends of the first elastic expansion bladder are respectively hooped on the outer surfaces of the inner and outer tubes, and a middle portion is elastically bulged, thereby separating the gap at the end of the heat exchange tube from the outside.

In some embodiments, the heat exchange pipe may include at least two perfusion sections, and two ends of two adjacent perfusion sections opposite to each other are provided with a second elastic expansion bladder in a ring shape, the two ends of the second elastic expansion bladder are respectively hooped on the outer pipes of the ends of the two adjacent perfusion sections, and the middle portion is elastically bulged, thereby separating the gap of the opposite ends from the outside.

In some embodiments, an intermediate support may be provided in the gap between the two ends of each infusion section for maintaining the gap between the inner and outer tubes, the intermediate support being a resilient metal member.

In some embodiments, the inner tube is a metal tube, and the metal tube of at least one of the perfusion sections may include a main tube and at least one metal short tube welded to an end of the main tube, the metal short tube being provided with a first through hole and a second through hole which are axially spaced apart, the first through hole being exposed from the outer tube, and the second through hole being covered by the outer tube; and the heat exchange tube may further comprise at least one flow guide member having a circular ring structure with a substantially U-shaped cross section, and an open side of the U-shaped cross section of the flow guide member is sealingly welded to an inner wall of the short metal tube such that the first and second through holes communicate with an annular space defined by the flow guide member and the short metal tube.

Preferably, the second through hole comprises a plurality of holes evenly distributed along the circumference of the metal short pipe.

Preferably, at least one annular groove is provided on the outer surface of the metal stub between the first and second through holes for receiving at least one annular resilient seal in sealing engagement with the walls of the inner and outer tubes.

In some embodiments, the heat exchange tube may include at least two impregnated sections, and the at least one metal short tube may include a common metal short tube disposed between two adjacent impregnated sections and simultaneously welded to an end of the main tube in the two impregnated sections, the common metal short tube being provided with a first through hole located at a middle in an axial direction and second through holes located at both sides, and the at least one flow guide may include a common flow guide disposed between two adjacent impregnated sections and welded to the common metal short tube.

According to another aspect of the present invention, there is also provided a heat exchanger, which includes a housing and the heat exchange tube arranged in the housing.

The heat exchanger can be a gas-liquid heat exchanger, wherein liquid flows in the heat exchange tube, and gas flows in the space between the heat exchange tube and the shell.

According to the utility model discloses heat exchange tube comprises the concentric sleeve pipe that metal pipe and non-metallic pipe are constituteed to pack Thermal Interface Material (TIM) in the sleeve pipe clearance. The composite sleeve structure of the metal pipe and the nonmetal pipe can give full play to the respective performance characteristics of the metal material and the nonmetal material, and achieves the advantages of adapting to the medium corrosion characteristic and efficiently transferring heat. Moreover, the thermal interface material has better deformation performance, thermal conductivity and filling performance, and the shape can be changed along with the thermal deformation of the interface of the metal pipe and the nonmetal pipe when the temperature is changed, wherein the part contacted with the metal pipe is changed along with the change of the shape of the metal pipe, and the part contacted with the nonmetal pipe is changed along with the change of the shape of the nonmetal pipe. Therefore, the thermal stress generated by the temperature change when the metal pipe and the nonmetal pipe are used in a compounding way can be eliminated, the working safety of the heat exchange pipe and the heat exchanger is improved, and the heat transfer efficiency is also improved.

Drawings

Other features, objects and advantages of the invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings. Wherein:

fig. 1 is a schematic structural diagram of a heat exchange tube according to a first embodiment of the present invention;

FIG. 2 is an enlarged partial cross-sectional view of an end portion of the heat exchange tube of FIG. 1;

fig. 3 is a partial enlarged view of a heat exchange tube according to a modification of the first embodiment of the present invention;

FIG. 4 is an end view of the heat exchange tube of FIG. 3;

fig. 5 is a schematic structural view of a heat exchange tube according to a second embodiment of the present invention;

FIG. 6 is an enlarged partial cross-sectional view of an end portion of the heat exchange tube of FIG. 1;

FIG. 7 is a cross-sectional view taken along section line A-A of FIG. 6;

fig. 8 is a schematic structural diagram of a heat exchange tube according to a second variation of the embodiment of the present invention;

fig. 9 is a schematic structural view of a heat exchange tube according to a third embodiment of the present invention;

FIG. 10 is an enlarged cross-sectional view of a portion B of the heat exchange tube of FIG. 9; and

fig. 11 is a schematic structural diagram of a heat exchange tube according to a third embodiment of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

Figure 1 schematically shows the structure of a heat exchange tube 1 according to a first embodiment of the invention,

fig. 2 shows an enlarged partial cross-sectional view of the end of the heat exchange tube 1. As shown in fig. 1 and 2, the heat exchange tube 1 has a composite structure, and includes an inner tube 10 and an outer tube 20 coaxially sleeved with each other, a gap is formed between the tube walls of the inner tube 10 and the outer tube 20, and the gap is filled with a paste-like Thermal Interface Material (TIM) 30.

In the example shown in fig. 1 and 2, the inner tube of the heat exchange tube 1 is a non-metal tube, and the outer tube 20 is a metal tube; however, as will be further explained below, the present invention is not limited thereto, and the inner pipe and the outer pipe may be a metal pipe and a non-metal pipe, respectively. The non-metal tube may be a tube made of a material having corrosion resistance such as a glass tube, a ceramic tube, or a PTFE tube, and the cross-sectional shape thereof may be a circular, elliptical, or rectangular shape, which is useful for improving the heat transfer effect.

The composite sleeve structure of the metal pipe and the nonmetal pipe can give full play to the respective performance characteristics of the metal material and the nonmetal material, and achieves the advantages of adapting to the medium corrosion characteristic and efficiently transferring heat.

In addition, according to application conditions, the heat exchange medium with high pressure and weak corrosivity can be arranged to contact the metal pipe, and the heat exchange medium with low pressure and strong corrosivity can contact the non-metal pipe capable of resisting corrosion of the metal pipe, so that a large amount of precious metals are saved, and the heat exchange device has the advantages of low cost, simple structure and convenience in use, and can bring good economic benefits.

The thermal interface material may be, for example, thermally conductive silicone grease, thermally conductive gel, thermally conductive paste, or the like. The thermal interface material has good deformation performance, thermal conductivity and filling performance, and the shape can be changed along with the thermal deformation of the interface of the metal pipe and the nonmetal pipe when the temperature is changed, wherein the part contacted with the metal pipe is changed along with the change of the shape of the metal pipe, and the part contacted with the nonmetal pipe is changed along with the change of the shape of the nonmetal pipe. Therefore, the thermal stress generated by the temperature change when the metal pipe and the nonmetal pipe are used in a compounding way can be eliminated, the working safety of the heat exchange pipe and the heat exchanger is improved, and the heat transfer efficiency is also improved.

In the example shown in fig. 1, through-holes 20a are opened in the outer tube 20 at both ends of the heat exchange tube 1. Preferably, the through hole 20a at one end may be used to fill the thermal interface material 30 into the gap when the heat exchange tube 1 is manufactured, and the through hole 20a at the other end may be used to exhaust the gas in the gap when it is poured. In other examples, the heat exchange pipe 1 may have the above-described through hole 2a only at one end thereof. The through holes 2a for injecting the thermal interface material are preferably threaded holes for connection to an external infusion device.

After the thermal interface material pouring is completed, the through-hole 2a may be closed with, for example, a sealant.

As shown in fig. 1 and 2, at the end of the heat exchange pipe 1, the inner pipe 10 may extend beyond the outer pipe 20, and the ends of the inner pipe 10 and the outer pipe 20 may be provided with a first elastic expansion bladder 40 having a ring shape, both ends of the first elastic expansion bladder 40 being respectively bound to the outer surfaces of the inner pipe 10 and the outer pipe 20, and a middle portion being elastically bulged, thereby separating a gap at the end of the heat exchange pipe from the outside. After the thermal interface material infusion is complete, a first elastomeric bladder 40 is fitted over the ends of the heat exchange tubes as above. Such an arrangement is advantageous in preventing leakage of thermal interface material in a composite construction heat exchange tube; in addition, the end part of the heat exchange tube is protected in the process of mounting and dismounting the heat exchange tube, so that the damage caused by collision and the like is reduced.

Referring to fig. 2, fig. 2 shows the structure of the heat exchange tube 1 more clearly. As shown in fig. 2, at the end of the heat exchange tube 1, an annular elastic seal member 51 is provided in the gap between the tube walls of the inner tube 10 and the outer tube 20, and the elastic seal member 51 is brought into sealing engagement with the tube walls of both the inner tube 10 and the outer tube 20, thereby sealing the thermal interface material 30 in the gap between the inner tube 10 and the outer tube 20. In the preferred example shown in fig. 2, a groove is provided in the outer wall of the inner tube 10 for receiving the resilient seal 51. This helps to improve the sealing effect and facilitates the assembly and manufacture of the heat exchange tube. In other examples, grooves may also be provided, for example, on the inner wall of the outer tube 20; the present invention is not limited in this respect.

Preferably, as shown in fig. 2, the heat exchange tube 1 may be provided at one end with two elastic seals 51 spaced apart in the axial direction to provide more effective and reliable sealing. In other examples, more than two resilient seals may be provided.

Further, although not shown, according to a preferred example of the embodiment of the present invention, the end of the heat exchange pipe may be further coated with a sealant. The first elastomeric bladder 40 may be at least partially wrapped around the applied sealant.

The heat exchange tube 1' shown in fig. 3 and 4 is a modification of the heat exchange tube 1 shown in fig. 1 and 2. In the heat exchange tube 1', the inner tube 10 is a metal tube, the outer tube 20 is a non-metal tube, and an injection connector 20b is attached to the outer circumference of the through-hole 20a of the non-metal outer tube 20. The injection connector 20b may have a threaded hole for communicating an external perfusion apparatus with the through hole 20 a. The injection connector 20b may be attached to the outer tube 20 by, for example, adhesive and/or snap-fit.

Since the outer tube 20 is a non-metal tube in the heat exchange tube 1', and a non-metal material generally has poor mechanical strength, attaching the injection connector 20b, which is specially used for communication with an external perfusion apparatus, around the through hole 20a is advantageous to protect the outer tube 20 of the non-metal material.

In some cases, the injection connector 20b may be removed from the heat exchange pipe 1' after completion of filling the thermal interface material.

A heat exchange tube according to a second embodiment of the present invention and its modifications will be described below with reference to fig. 5 to 8.

Fig. 5 is a schematic structural diagram of a heat exchange tube 2 according to a second embodiment of the present invention, and fig. 6 is an enlarged partial sectional view of an end portion of the heat exchange tube 2. According to the utility model discloses heat exchange tube 2 of embodiment two and according to the utility model discloses heat exchange tube 1 of embodiment one has basically the same structure, and the difference lies in, still is provided with the injection subassembly at the tip of heat exchange tube 2, and this injection subassembly includes the metal nozzle stub of inner tube 10 tip and welds the water conservancy diversion spare to this nozzle stub. The inject assembly will be described in more detail below in conjunction with the figures.

As shown in fig. 5 and 6, in the heat exchange tube 2, the inner tube 10 is a metal tube including a main tube 11 and short metal tubes 12 welded to ends of the main tube 11, the short metal tubes 12 are provided with first through holes 12a and second through holes 12b axially spaced apart, the first through holes 12a are exposed from the outer tube 20, and the second through holes 12b are covered by the outer tube 20. The heat exchange tube 2 further comprises a flow guide 60, the flow guide 60 has a circular ring structure with a substantially "U" shaped cross section, and the open side of the "U" shaped cross section of the flow guide 60 is sealingly welded to the inner wall of the short metal tube 12 such that the first and second through holes 12a and 12b communicate with an annular space enclosed by the flow guide 60 and the short metal tube 12.

The heat exchange tube 2 shown in fig. 5 is provided with injection assemblies at both ends, i.e., a metal short tube 12 welded to a main tube 11 is provided at both ends of a metal tube inner tube 10, and flow guides 60 are welded on the inner walls of the metal short tube 12. In manufacturing the heat exchange tube 2, an injection assembly at one end may be used to inject a thermal interface material into the gap between the inner and outer tubes. At this time, the first elastic expansion bladder 40 is not installed, the first through hole 12a is connected to an external perfusion apparatus, and the thermal interface material enters the annular space formed by the metal short tube 12 and the fluid guide member 60 through the first through hole 12a, and then enters the gap between the inner tube 10 and the outer tube 20 through the second through hole 12b, as shown in fig. 6. The other end of the injection assembly may be used to outwardly exhaust the gas in the gap.

Here, the use of a separate metal stub is primarily for the convenience of welding the baffle to the inner wall of the metal tube. Specifically, in the case of the metal short pipe, the baffle member may be easily welded to the inner wall of the metal short pipe first, and then the metal short pipe may be welded to the end of the main body pipe of the metal inner pipe. In contrast, if a short metal pipe is not used and the flow guide is directly welded to the metal pipe, the welding near the inner side is difficult to perform and the sealing performance of the weld is difficult to guarantee. According to the utility model discloses heat exchange tube two is more convenient in the manufacturing, and sealing performance can be more excellent moreover.

Fig. 7 is a cross-sectional view taken along section line a-a of fig. 6. As shown in fig. 7, preferably, the second through holes 12b of the metal short pipe 12 may include a plurality of holes uniformly distributed along the circumference of the metal short pipe 12, which facilitates more uniform filling of the thermal interface material in the gap between the inner pipe 10 and the outer pipe 20 while avoiding bubbles caused by non-uniform filling. The bubbles are very disadvantageous to the heat exchange efficiency and the working safety of the heat exchange pipe.

As shown in fig. 6, it is preferable that the first elastic expansion bladder 40 is installed to cover the first through hole 12 a.

Further, in the example shown in fig. 6, an intermediate support member 52 may be further provided between both ends of the heat exchange pipe 2. Intermediate support members 52 are positioned in the gap between the inner and outer tubes and function to ensure concentricity of the inner and outer tubes and to enhance the thermal conductivity of the thermal interface material 30. The intermediate support 52 may be a metallic material, a metallic composite material, or a high thermal conductivity non-metallic elastic material; which may be spaced apart or may be continuous within the gap. The intermediate support 52 may be a tubular braided mesh, a spiral wire wound or longitudinal ribbed member, or the like. In some examples, it is preferred that the intermediate support 51 be a resilient metal member.

Fig. 8 is a simple schematic diagram of a heat exchange tube 2' according to a second embodiment of the present invention. The heat exchange tube 2 'has substantially the same structure as the heat exchange tube 2 except that a through-hole 20a is provided at the middle of the outer tube of the heat exchange tube 2'. In filling the thermal interface material, the injection assemblies at both ends of the heat exchange pipe 2' may be used to inject the thermal interface material into the gap between the inner and outer pipes, and the through-hole 20a at the middle of the outer pipe 20 may be used to discharge the gas in the gap. After the completion of the pouring, the through-hole 20a may be closed with a sealant, for example.

It will be understood that although the heat exchange tubes shown in fig. 5 and 8 include injection assemblies at both ends thereof, heat exchange tubes according to other embodiments of the present invention may include injection assemblies at only one end thereof; the other end of the heat exchange tube may be directly provided with a through hole in the outer tube to achieve air exhaust, or the gap between the inner tube and the outer tube at the other end may not be sealed before the filling of the thermal interface material is completed, so as to facilitate air exhaust.

A heat exchange tube according to a third embodiment of the present invention will be described with reference to fig. 9 and 10.

As shown in fig. 9, the heat exchange tube 3 according to the third embodiment of the present invention has substantially the same structure as the heat exchange tube 2 according to the second embodiment of the present invention, except that the heat exchange tube 3 includes two filling sections, and the heat exchange tube 2 includes only one filling section. Here, the potting section refers to a portion of the heat exchange tube between the inner tube and the outer tube containing a heat interface material potting space (gap) sealed end to end.

As shown in fig. 9, the heat exchange pipe 3 includes a first potting section 100 and a second potting section 200, each of which includes an inner pipe 10 and an outer pipe 20, respectively, and a paste-like thermal interface material 30 filled in a gap between the inner and outer pipes, wherein a common short metal pipe 40' and a common flow guide 60 are disposed between the first potting section 100 and the second potting section 200. A common metal stub 40' is welded simultaneously to the ends of the main body tube 11 of the metal inner tube 10 of the two adjacent infusion sections. As shown more clearly in fig. 10, the common metal short pipe 40' is provided with a first through hole 12a located in the middle in the axial direction and second through holes 12b located on both sides. The common baffle 60 is welded to the inner wall of the common short metal pipe 40 'such that the first through hole 12a and the second through hole 12b are both communicated with the annular space enclosed by the common short metal pipe 40' and the common baffle 60.

When the thermal interface material is filled, the thermal interface material may be filled using the injection members at both ends of the heat exchange pipe 3, and the gas may be discharged using the injection member in the middle; alternatively, an injection assembly in the middle of the heat exchange tube 3 may be used to inject the thermal interface material, while injection assemblies at both ends may be used to exhaust the gas.

The heat exchange tube 3 according to the third embodiment of the present invention is particularly advantageous for providing a heat exchange tube with a corrosion-resistant composite structure with a large length, because when the length of the heat exchange tube is increased, the difficulty of filling a thermal interface material between the inner tube and the outer tube is large, and the uniformity of filling is difficult to ensure; the heat exchange tube is divided into a plurality of pouring sections, so that the heat exchange tube is beneficial to filling of thermal interface materials, the heat exchange tube is convenient to manufacture, and the quality of the heat exchange tube is also beneficial to improvement, for example, the heat exchange efficiency and the working safety of the heat exchange tube are provided by uniformly and effectively filling the thermal interface materials.

Fig. 11 schematically shows a heat exchange tube according to a variation of the third embodiment of the present invention. The heat exchange tube 3 'shown in fig. 11 has substantially the same structure as the heat exchange tube 3 shown in fig. 9, except that the heat exchange tube 3' includes more potting sections. It will be appreciated that the heat exchange tube may include three or more different numbers of infusion sections depending on the needs of the application and the specifics of the heat exchange tube construction, and that some of the infusion assemblies may be selected for infusion of the thermal interface material and some for venting of the gas during the thermal interface material filling.

Referring back to fig. 1, 5 and 8, it can be seen that in the examples shown in these figures, the heat exchange tubes each comprise only one potting section 100; however, it should be understood that the present invention is not limited thereto. In other embodiments according to the present invention, the heat exchange tube may include more than one priming section, and at least one of the priming sections may have the same structure as the one priming section of the heat exchange tube described above with reference to fig. 1, 5 and 8.

Furthermore, although not shown in the drawings, the present invention also relates to a heat exchanger, which comprises a housing and a heat exchange tube arranged in the housing, as described above, according to an embodiment of the present invention. In some embodiments, the heat exchanger is a gas-liquid heat exchanger, wherein liquid is circulated in the heat exchange tube and gas is circulated in the space between the heat exchange tube and the shell.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (12)

1. A corrosion-resistant composite structure heat exchange tube comprises at least one pouring section, wherein each pouring section comprises an inner tube and an outer tube which are coaxially sleeved, a certain gap is formed between the tube walls of the inner tube and the outer tube, one of the inner tube and the outer tube is a metal tube, the other one of the inner tube and the outer tube is a non-metal tube, and a pasty thermal interface material is filled in the gap.

2. A heat exchange tube according to claim 1, wherein an annular resilient seal is provided in said gap at the end of at least one of said potting sections, and a groove is formed in the wall of at least one of said inner and outer tubes for receiving said resilient seal and which is in sealing engagement with the walls of the inner and outer tubes.

3. The heat exchange tube of claim 2, wherein the elastomeric seal comprises two elastomeric seals axially spaced apart and coated with a sealant at the ends of the potting section.

4. A heat exchange tube according to any one of claims 1 to 3, wherein the inner tube extends beyond the outer tube at both ends thereof, and the heat exchange tube further comprises a first elastic expansion bladder in the form of a ring at each end thereof, both ends of the first elastic expansion bladder being respectively hooped on the outer surfaces of the inner and outer tubes, and a middle portion being elastically bulged so as to separate the gap at the end of the heat exchange tube from the outside.

5. The heat exchange tube according to claim 4, wherein the heat exchange tube comprises at least two impregnated sections, and two ends of the adjacent impregnated sections, which are opposite to each other, are provided with a second elastic expansion bladder having a ring shape, both ends of which are respectively hooped on the outer tubes of the ends of the adjacent two impregnated sections, and a middle portion thereof is elastically bulged, thereby separating the gap of the opposite ends from the outside.

6. A heat exchange tube according to claim 1 or 2, wherein an intermediate support is provided in the gap between the two ends of each impregnated section for maintaining the gap between the inner and outer tubes, the intermediate support being a resilient metal member.

7. The heat exchange tube of claim 1, wherein the inner tube is a metal tube, the metal tube of at least one of the impregnated sections comprises a main tube and at least one metal short tube welded to an end of the main tube, the metal short tube being provided with a first through hole and a second through hole axially spaced apart, the first through hole being exposed from the outer tube, and the second through hole being covered by the outer tube; and is

The heat exchange tube further comprises at least one flow guide piece, the flow guide piece is of a circular ring structure with a cross section of a roughly U-shaped shape, and the opening side of the U-shaped cross section of the flow guide piece is welded to the inner wall of the metal short tube in a sealing mode, so that the first through hole and the second through hole are communicated with an annular space formed by the flow guide piece and the metal short tube in a surrounding mode.

8. The heat exchange tube of claim 7, wherein the second through-holes comprise a plurality of holes evenly distributed along the circumference of the metal short tube.

9. The heat exchange tube of claim 7, wherein at least one annular groove is provided on the outer surface of the metal stub between the first and second throughbores for receiving at least one annular elastomeric seal in sealing engagement with the walls of the inner and outer tubes.

10. A heat exchange tube according to any one of claims 7 to 9, wherein the heat exchange tube comprises at least two impregnated sections, and the at least one metal short tube comprises a common metal short tube disposed between two adjacent impregnated sections and welded to the ends of the main tube in the two impregnated sections at the same time, the common metal short tube is provided with a first through hole located at the middle in the axial direction and second through holes located at both sides, and the at least one flow guide comprises a common flow guide disposed between two adjacent impregnated sections and welded to the common metal short tube.

11. A heat exchanger comprising a shell and a heat exchange tube disposed inside the shell, wherein the heat exchange tube is the heat exchange tube as recited in any one of claims 1 to 10.

12. The heat exchanger of claim 11, wherein the heat exchanger is a gas-to-liquid heat exchanger, wherein the heat exchange tube is in fluid communication with the interior of the heat exchange tube, and wherein the space between the heat exchange tube and the shell is in fluid communication with the interior of the shell.

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