CN219161074U - Heat exchange tube, heat exchanger and sealing buckle for heat exchange tube - Google Patents

Abstract

The application discloses heat exchange tube, it includes upper panel and lower panel relatively and spaced apart each other and sets up the sealed buckle in at least one side department of panel, sealed buckle includes body and last chucking flank and lower chucking flank that stretches out towards first side from upper edge and lower edge of body, goes up chucking flank and lower chucking flank and relatively and form the draw-in groove with the body together each other, and the side of upper panel and lower panel is received in the draw-in groove to by last chucking flank and lower chucking flank chucking. According to the embodiment of the utility model, the sealing buckle is used for clamping the two panels at the edge of the heat exchange tube, so that the sealing structure of the heat exchange tube is maintained, the service life of the heat exchange tube is prolonged, and the stable operation of the heat exchanger is facilitated.

Description

Heat exchange tube, heat exchanger and sealing buckle for heat exchange tube

Technical Field

The utility model relates to a gas-gas heat exchange technology, in particular to a heat exchange tube and a heat exchanger for gas-gas heat exchange and a sealing buckle for the heat exchange tube.

Background

And a gas-gas heat exchanger is needed to be adopted in the flue gas waste heat recovery device or the flue gas cooling device to realize heat exchange between flue gas and air. Such gas-gas heat exchangers may be, for example, air preheaters, flue gas air coolers, etc., depending on the application. In order to maximize energy recovery or obtain a better cooling effect, it is generally desirable that the temperature of the flue gas after heat exchange is lower and that the air temperature is higher. However, when the temperature of the flue gas is reduced below the condensation dew point, acid dew is generated, corrosion is caused to the heat exchange tube, and the service life of the heat exchanger is reduced.

For this purpose, chinese patent application No. 201711288625.2 entitled "heat exchange tube, heat exchanger including the same, and method of manufacturing the heat exchange tube" proposes a heat exchange tube made of corrosion resistant materials such as glass and ceramic, wherein heat exchange panels and side baffles enclose an inner channel of the heat exchange tube defining a flat shape, and are sealingly bonded together by an adhesive. The heat exchange tube can overcome the problem of corrosion of the heat exchange tube caused by flue gas condensation, and is simple and convenient to manufacture. However, this technique is not without drawbacks. The connection formed by bonding in the heat exchange tube is easily damaged and failed due to the high temperature and corrosiveness of the flue gas, so that the tightness of the heat exchange tube is difficult to maintain.

Disclosure of Invention

The utility model aims to provide a heat exchange tube, a heat exchanger and a sealing buckle for the heat exchange tube, so as to at least partially overcome the defects in the prior art.

According to one aspect of the present utility model, there is provided a heat exchange tube comprising upper and lower panels opposed to and spaced apart from each other and a sealing clip provided at least one side edge of the upper and lower panels, the sealing clip comprising a body and upper and lower clamping wings projecting from upper and lower edges of the body towards a first side, the upper and lower clamping wings being opposed to each other and forming a clamping groove with the body, the side edges of the upper and lower panels being received in the clamping groove so as to be clamped by the upper and lower clamping wings.

Advantageously, the body has an arcuate profile on a second side opposite to the first side.

In some embodiments, the sealing clasp further comprises an intermediate spacer portion extending from the body to the first side, the intermediate spacer portion being located between the upper and lower clamping wings and forming an upper and lower clamping groove with the upper and lower clamping wings, respectively; and the side edge of the upper panel is clamped into the upper clamping groove, and the side edge of the lower panel is clamped into the lower clamping groove.

Advantageously, the intermediate spacer comprises an upper spacer flank and a lower spacer flank, the upper clamping groove being formed between the upper spacer flank and the upper clamping flank, the lower clamping groove being formed between the lower spacer flank and the lower clamping flank.

Advantageously, the upper clamping flap and the lower clamping flap comprise a plurality of flaps spaced apart in the extension direction of the upper edge and the lower edge, respectively.

Advantageously, in the up-down direction, the upper edge of the body of the sealing clasp is lower than or flush with the upper surface of the upper panel and the lower edge of the body of the sealing clasp is higher than or flush with the lower surface of the lower panel, thereby forming a recess between the plurality of tabs.

Advantageously, the length of the plurality of fins in the extending direction is 20% or less of the length of the upper panel and the lower panel in the extending direction.

In some embodiments, the heat exchange tube further comprises a side baffle disposed at the at least one side edge of the upper and lower panels, the side baffle comprising a separation structure for being sandwiched between the upper and lower panels to maintain a spacing therebetween, the side baffle enclosing with the upper and lower panels an interior channel of the heat exchange tube.

In some embodiments, the sealing clip encloses with the upper and lower panels to form an interior channel of the heat exchange tube.

According to another aspect of the present utility model, there is provided a heat exchanger comprising a housing having an interior space and a plurality of heat exchange tubes supported on and passing through the interior space of the housing, wherein at least one of the heat exchange tubes is a heat exchange tube as described above.

Advantageously, the housing comprises two sealing plates arranged opposite to each other, on which a plurality of mounting through holes are formed respectively, the two ends of at least one heat exchange tube are fitted and connected in a sealing manner with the mounting through holes, and the body of the sealing buckle has an arc-shaped profile adapted to the mounting through holes on a second side opposite to the first side.

According to a further aspect of the present utility model there is provided a sealing clip for a heat exchange tube as described above comprising a body and upper and lower clamping wings projecting from the upper and lower edges of the body towards a first side, the upper and lower clamping wings being opposite each other and forming a clamping groove with the body.

According to the embodiment of the utility model, the sealing buckle is used for clamping the two panels at the edge of the heat exchange tube, so that the sealing structure of the heat exchange tube is maintained, the service life of the heat exchange tube is prolonged, and the stable operation of the heat exchanger is facilitated.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings in which:

fig. 1 is a perspective view of an example of a heat exchanger according to an embodiment of the present utility model;

fig. 2 is a perspective view of an example one of a heat exchange tube according to a first embodiment of the present utility model;

FIG. 3 is a partially exploded view of the heat exchange tube of FIG. 2;

FIG. 4 illustrates different cross-sectional shapes of sealing catches that may be used with the heat exchange tube according to the first embodiment of the utility model;

fig. 5 is a perspective view of an example two of a heat exchange tube according to a first embodiment of the present utility model;

fig. 6 is a perspective view of an example three of a heat exchange tube according to a first embodiment of the present utility model;

FIG. 7 is a partially exploded view of the heat exchange tube of FIG. 6;

fig. 8 is a perspective view of an example four of a heat exchange tube according to a first embodiment of the present utility model;

FIG. 9 is a partially exploded view of the heat exchange tube of FIG. 8;

fig. 10 is a partial enlarged view of an example five of a heat exchange tube according to a first embodiment of the utility model;

fig. 11 is a perspective view of an example one of a heat exchange tube according to a second embodiment of the present utility model;

FIG. 12 illustrates different cross-sectional shapes of sealing snaps that may be used in a heat exchange tube according to a second embodiment of the present utility model;

fig. 13 is a perspective view of an example two of a heat exchange tube according to a second embodiment of the present utility model;

FIG. 14 is a partially exploded view of the heat exchange tube of FIG. 13;

fig. 15 is a partial enlarged view of an example three of a heat exchange tube according to a second embodiment of the present utility model;

fig. 16 is a perspective view of an example four of a heat exchange tube according to a second embodiment of the present utility model;

fig. 17 is a partially enlarged view of an example five of a heat exchange tube according to a second embodiment of the present utility model and a sealing clip used therein.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. For convenience of description, only parts related to the utility model are shown in the drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

Fig. 1 is a perspective view of an example of a heat exchanger according to an embodiment of the present utility model. As shown in fig. 1, a heat exchanger 1 according to an embodiment of the present utility model includes a housing 1a and a plurality of heat exchange tubes 10. The housing 1a has an inner space, and the heat exchange tube 10 is supported on the housing 1a and passes through the inner space of the housing 1 a.

In some embodiments, as shown in fig. 1, the housing 1a may include two sealing plates 1b disposed opposite to each other, and a plurality of mounting through holes 1c are formed in the sealing plates 1b, respectively, through which both ends of the heat exchange tube 10 pass and are in sealing connection therewith. When the heat exchanger 1 works, the first gas flows through the internal channel of the heat exchange tube 10, and the second gas flows through the space between the heat exchange tube 10 and the shell 1a, so that the first gas and the second gas realize partition wall heat exchange inside and outside the heat exchange tube 10.

First, a heat exchange tube according to a first embodiment of the present utility model for a heat exchanger 1 will be described with reference to fig. 2 to 10.

Fig. 2 is a perspective view of an example one of a heat exchange tube according to a first embodiment of the present utility model, and fig. 3 is a partially exploded view of the heat exchange tube shown in fig. 2. As shown in fig. 2 and 3, the heat exchange tube 10A includes a pair of panels (including an upper panel and a lower panel) 11 opposed to each other and spaced apart from each other, and sealing snaps 100A provided at the sides of the panels 11.

The heat exchange tube 10A may further include side baffles 12 provided at the sides of the panels 11 for enclosing the inner channels 10A of the heat exchange tube 10A with a pair of panels 11. In the example shown in fig. 2 and 3, the side guards 12 integrally form a separation structure sandwiched between two panels to maintain the separation between the panels.

According to the present embodiment, as more clearly shown in fig. 3, the sealing clip 100A includes a body 110 and upper and lower clamping wings 121 and 122 protruding from upper and lower edges of the body 110 toward a first side (a side toward the inside of the heat exchange tube), the upper and lower clamping wings 121 and 122 being opposite to each other and forming a clamping groove g together with the body 110. In the assembled state, the side edges of the pair of panels 11 are received in the catching groove g so as to be caught up and down by the upper and lower catching wings 121 and 122.

In the examples shown in fig. 2 and 3, the heat exchange tube comprises two side baffles arranged on both sides of the panel, both the two panels and the two side baffles being separated from each other and sealingly connected together; accordingly, sealing snaps are provided at both sides opposite to each other to clamp two panels at both sides. It should be understood that the present utility model is not limited to the above. For example, two of the panels may be continuous or fixedly joined. This can be achieved, for example, by folding a glass sheet in half when it is in the hot-melt state to form a folded structure having a "U" shaped cross section. In this way, the two panels need to be spaced apart from each other at only one side by the side dams and sealingly connected to the side dams, for example by adhesive bonding; accordingly, according to other embodiments of the utility model, sealing snaps may be provided at only one side of the two panels.

The heat exchange tube 10 may further include intermediate spacers 13, as shown in fig. 2 and 3, for providing intermediate support to the panel 11, and for separating the internal channels of the heat exchange tube into different heat exchange channels, according to an embodiment of the present utility model.

According to the embodiment of the utility model, preferably, the panel and the side baffle in the heat exchange tube are made of glass, ceramic, graphite or silicon carbide and other corrosion-resistant materials so as to improve the corrosion resistance of the heat exchange tube and the heat exchanger, thereby improving the heat exchange efficiency. Preferably, the sealing clasp is made of metal.

In the example shown in fig. 2 and 3, the second side of the body 110 of the sealing clip 100A has a generally semi-circular profile. However, the utility model is not limited thereto and the cross-sectional profile of the sealing clasp and body may have other shapes. Fig. 4 shows different cross-sectional shapes of sealing catches that may be used with the heat exchange tube according to the first embodiment of the utility model, wherein the left side graph (a) shows that the second side of the body may have an arcuate profile of a smaller arc than a semicircle, the middle graph (b) shows that the second side of the body may have a straight profile, and the right side graph (c) shows that the second side of the body may have a substantially straight profile and form a rounded profile at the corners intersecting the upper and lower clamping flanks. Preferably, the body of the sealing clasp has an arcuate profile on a second side opposite the first side.

Although the sealing clip 100A is shown in fig. 2 and 3 as extending over a portion of the length of the side edge of the panel 11, it should be appreciated that the sealing clip may have a smaller or larger length, depending on the embodiment, as long as an up-and-down clamping action on the panel 11 is enabled. For example, the length of the sealing catch may be the same or substantially the same as the length of the side edge of the panel. As another example, the length of the sealing clasp may be significantly less than the length of the side edges of the panel, so that more than two sealing clasps may be used to clasp the panel at a single side edge.

Preferably, the body of the sealing clip has an arcuate profile on the second side that is adapted to the mounting through-hole of the sealing plate. In this way, in the case where the sealing clip is mounted to extend to the end of the heat exchange tube, the arcuate profile of the sealing clip facilitates the fitting and sealing connection of the heat exchange tube with the mounting through hole of the sealing plate.

Fig. 5 shows an example two of a heat exchange tube according to the first embodiment of the present utility model. As shown in fig. 5, in the heat exchange tube 10B, the length of the sealing clip 100B is significantly smaller than the length of the side edge of the panel 11, so that three sealing clips 100B are used at intervals on a single side edge to clip the panel 11. Apart from the difference in length, the sealing clip 100B may have the same or partially the same structure as the sealing clip 100A described above and/or in other examples described below.

In addition, in the example shown in fig. 5, seals 14 are provided at both ends of the side shields 12 at both sides of the heat exchange tube 10B. The seal 14 may have the same structure as the seal 14 shown in fig. 7. As shown more clearly in fig. 7, the body of the seal 14 is a rail portion 14a, which rail portion 14a may have an arcuate profile on the side remote from the interior of the heat exchange tube to mate and seal with mounting holes in the seal plate. Preferably, a slightly protruding fitting portion 14b may also be formed in the middle of the rail portion 14a toward the inside of the heat exchange tube for fitting between the two panels 11, thereby better positioning the sealing member 14 with respect to the panels.

Fig. 6 and 7 show an example three of a heat exchange tube according to the first embodiment of the present utility model. The heat exchange tube 10C shown in fig. 6 and 7 has substantially the same structure as the heat exchange tube 10A shown in fig. 2 and 3, except that: the upper chucking wing 121 of the sealing clip 100C in the heat exchange tube 10C includes a plurality of fins 121a spaced apart in the extending direction of the upper edge, and the lower chucking wing 122 includes a plurality of fins 122a spaced apart in the extending direction of the lower edge. Preferably, the plurality of wings 121a of the upper chucking side wing 121 are provided in pairs up and down with the plurality of wings 122a of the lower chucking side wing 122.

Preferably, in the up-down direction, the upper edge of the body 110 of the sealing clip 100C is lower than or flush with the upper surface of the upper panel 11a, and the lower edge of the body 110 of the sealing clip 100C is higher than or flush with the lower surface of the lower panel 11b, thereby forming a recess (e.g., recess 121b shown in fig. 7) between the plurality of tabs. Preferably, the length of the plurality of fins 121a, 122a in the extending direction is 20% or less of the length of the upper panel 11a, the lower panel 11b in the extending direction of the corresponding side edges. Therefore, the influence of the clamping side wings of the sealing buckle on the effective flow area of the heat exchange medium outside the heat exchange tube can be reduced, and the tight arrangement of the heat exchange tube in the heat exchanger is facilitated.

Fig. 8 is a perspective view of an example four of a heat exchange tube according to a first embodiment of the present utility model, and fig. 9 is a partially exploded view of the heat exchange tube shown in fig. 8.

As shown in fig. 8 and 9, in the heat exchange tube 10D, the side baffle 12 includes a partition structure 12a and a rail structure 12b. The partition structure 12a is sandwiched between and respectively abuts against the two panels 11 to keep the panels 11 spaced apart by a predetermined distance. The rail structure 12b is integrally formed with or fixed to the partition structure 12a and is located on the opposite side of the inner passage 10a of the heat exchange tube 10D with respect to the partition structure 12 a. The rail structure 12b has a larger dimension relative to the partition structure 12a in a direction perpendicular to the panel 11 so as to abut against the edge of the panel 11 in a direction parallel to the panel 11. In the example shown in fig. 8 and 9, the side guards 12 have the same length as the corresponding sides of the panel 11.

In this example, the sealing clip 100D of the heat exchange tube 10D has a generally C-shaped cross section, with the body 110, the upper clamping flank 121 and the lower clamping flank 122 forming a smoothly continuous, curled sheet-like structure in shape. In addition, as shown in fig. 9, the length of the sealing clip 100D is significantly smaller than the length of the corresponding side of the panel 11. Such a sealing clip 100D is very easy to manufacture.

Fig. 10 is a partial enlarged view of an example five of a heat exchange tube according to a first embodiment of the present utility model. The heat exchange tube 10E shown in fig. 10 has substantially the same structure as the heat exchange tube 10A shown in fig. 2 and 3, except that: in the heat exchange tube 10E, the sealing clip 100E is formed with a boss portion 110a on a first side (side facing the inside of the heat exchange tube) of the body 110 for fitting between the two panels 11, and may abut against the side baffle 12, so that the sealing clip 100E is more stably mounted on the heat exchange tube.

Next, a heat exchange tube according to a second embodiment of the present utility model will be described with reference to the accompanying drawings.

Fig. 11 is a perspective view of an example one of a heat exchange tube according to a second embodiment of the present utility model. As shown in fig. 11, the heat exchange tube 10A' includes a pair of panels 11 (including upper and lower panels) opposite to and spaced apart from each other and a sealing clip 200A provided at sides of the panels 11 (including upper and lower panels 11a and 11 b), and according to the present embodiment, the sealing clip 200A includes a body 210 and upper and lower clip wings 221 and 222 protruding from upper and lower edges of the body 210 toward a first side (a side toward an inside of the heat exchange tube). The sealing clip 200A also includes an intermediate spacer 230 extending from the body 210 to the first side. The cross section of the sealing clip 200A is shown enlarged in the dashed circle of fig. 11, and as shown, the middle spacer 230 is located between the upper clamping wing 221 and the lower clamping wing 222, and forms an upper clamping groove g1 and a lower clamping groove g2 with the upper clamping wing 221 and the lower clamping wing 222, respectively. In the assembled state, the side edge of the upper panel 11a is locked into the upper locking groove g1, and the side edge of the lower panel 11b is locked into the lower locking groove g2.

As shown in fig. 11, the intermediate spacer 230 may be formed with an upper abutment surface 231 and a lower abutment surface 232 for abutting and supporting the upper and lower panels 11a and 11b, respectively.

According to this embodiment, the sealing clip may enclose the inner channels of the heat exchange tube with a pair of panels, as shown in fig. 11. In this case, the sealing clasp may be sealingly connected to the panel by an adhesive.

Although not shown, it should be understood that the heat exchange tube according to the second embodiment may further include a side baffle plate disposed inside a sealing clip (e.g., sealing clip 200A) for separating and sealing-connecting a pair of panels to enclose an inner channel of the heat exchange tube.

Similar to what has been discussed above in connection with the first embodiment, the sealing clip and its body may have different cross-sectional shapes/contours in the heat exchange tube according to the second embodiment. In addition to the body 210 shown in fig. 11 having a substantially semicircular cross-sectional profile on a second side opposite the first side, the body may also have an arcuate profile of less curvature than a semicircle on the second side (see figure 12 (a)), a straight profile, or a substantially straight profile with rounded corners (see figures 12 (b) and (c)), as shown in fig. 12. Furthermore, according to the second embodiment, the length of the intermediate spacer protruding towards the first side may be the same as or different from the upper clamping wing and the lower clamping wing. For example, as shown in graph (d) of fig. 12, the intermediate spacer may extend a greater length toward the first side to increase the support of the panel or to increase the contact area for bonding and sealing with the panel.

Fig. 13 is a perspective view of an example two of a heat exchange tube according to a second embodiment of the present utility model, and fig. 14 is a partially exploded view of the heat exchange tube shown in fig. 13. The heat exchange tube 10B 'shown in fig. 13 and 14 has substantially the same structure as the heat exchange tube 10A' shown in fig. 11, except that: in the heat exchange tube 10B', the seal members 14 are used in cooperation with both ends of the seal clip 200B. Here, the sealing member 14 may have the same structure as the sealing member 14 described above with reference to fig. 5 and 7, and the sealing clip 200B may have the same structure as the sealing clip 200A shown in fig. 11, and will not be described again. The heat exchange tube 10B' of the present example can be well adapted to different heat exchanger housings by selecting the sealing member 14 adapted to the mounting through hole 1c on the sealing plate 1B without customizing different sealing buckles due to slight differences in the shape or size of the mounting through hole 1c, which is advantageous in simplifying the manufacture of the heat exchange tube and reducing the cost.

In other cases, the heat exchange tube 10C' in example three shown in fig. 15 may also be employed for fitting with the mounting through hole on the sealing plate of the heat exchanger. The difference between the sealing clip 200C employed in the heat exchange tube 10C' and the sealing clips 200A, 200B is that: the end a of the sealing clip 200C does not form an upper clamping wing or a lower clamping wing. In other words, the upper chucking wing 221 and the lower chucking wing 222 formed by the sealing clip 200C do not extend to the ends thereof. In this way, the ends of the sealing clasp may form a continuous smooth cross-sectional profile with the upper and lower panels to facilitate mating and connection with the mounting through-holes.

Fig. 16 is a perspective view of an example four of a heat exchange tube according to a second embodiment of the present utility model. The heat exchange tube 10D 'shown in fig. 16 has substantially the same structure as the heat exchange tube 10A' shown in fig. 11, except that: the upper chucking wing 221 of the sealing clip 200D in the heat exchange tube 10D' includes a plurality of fins 221a spaced apart in the extending direction of the upper edge, and the lower chucking wing 222 includes a plurality of fins 222a spaced apart in the extending direction of the lower edge. Preferably, the plurality of wings 221a of the upper chucking wing 221 are provided in pairs up and down with the plurality of wings 222a of the lower chucking wing 222.

Preferably, in the up-down direction, the upper edge of the body 210 of the sealing clip 200D is lower than or flush with the upper surface of the upper panel 11a, and the lower edge of the body 210 of the sealing clip 200D is higher than or flush with the lower surface of the lower panel 11b, thereby forming a recess (e.g., recess 221b shown in fig. 16) between the plurality of tabs. Preferably, the length of the plurality of fins 221a, 222a in the extending direction is 20% or less of the length of the upper panel 11a, the lower panel 11b in the extending direction of the corresponding side edges. Therefore, the influence of the clamping side wings of the sealing buckle on the effective flow area of the heat exchange medium outside the heat exchange tube can be reduced, and the tight arrangement of the heat exchange tube in the heat exchanger is facilitated.

Although not shown, it should be understood that the heat exchange tube 10B 'and the ends of the heat exchange tube's sealing clasp in other examples may also be used with a seal (e.g., seal 14 shown in fig. 7), as the utility model is not limited in this respect.

Fig. 17 is a right-hand side view (b) showing a partially enlarged view of an example five of a heat exchange tube according to a second embodiment of the present utility model, and fig. 17 is a left-hand side view (a) showing a partially enlarged view of a sealing clip used in the example. In the heat exchange tube 10E' of the present example, as shown in fig. 17, the middle spacer portion of the sealing clip 200E includes an upper spacer wing 230a and a lower spacer wing 230b, an upper clamping groove g1 is formed between the upper spacer wing 230a and the upper clamping wing 221, and a lower clamping groove g2 is formed between the lower spacer wing 230b and the lower clamping wing 222. The heat exchange tube 10E' of the present example is advantageous in increasing the effective area of the inner passage 10a of the heat exchange tube, and improving the heat exchange efficiency.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the utility model. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (12)

1. A heat exchange tube comprising upper and lower panels opposed to each other and spaced apart, and a sealing clasp provided at least one side of the upper and lower panels, the sealing clasp comprising a body and upper and lower clamping wings projecting from the upper and lower edges of the body towards a first side, the upper and lower clamping wings being opposed to each other and forming a clamping groove with the body, the sides of the upper and lower panels being received in the clamping groove so as to be clamped by the upper and lower clamping wings.

2. The heat exchange tube of claim 1, wherein the body has an arcuate profile on a second side opposite the first side.

3. The heat exchange tube of claim 1, wherein the sealing clip further comprises an intermediate spacer extending from the body to the first side, the intermediate spacer being located between the upper and lower clamping wings and forming upper and lower clip slots with the upper and lower clamping wings, respectively; and is also provided with

The side edge of the upper panel is clamped into the upper clamping groove, and the side edge of the lower panel is clamped into the lower clamping groove.

4. A heat exchange tube according to claim 3 wherein said intermediate spacer includes upper and lower spacer wings, said upper spacer wing and said upper clamping wing defining said upper clamping slot therebetween, and said lower spacer wing and said lower clamping wing defining said lower clamping slot therebetween.

5. The heat exchange tube of any one of claims 1-4, wherein the upper clamping wing and the lower clamping wing include a plurality of fins spaced apart in the direction of extension of the upper edge and lower edge, respectively.

6. The heat exchange tube of claim 5, wherein an upper edge of the body of the sealing clip is lower than or flush with an upper surface of the upper panel and a lower edge of the body of the sealing clip is higher than or flush with a lower surface of the lower panel in an up-down direction, thereby forming a recess between the plurality of fins.

7. The heat exchange tube of claim 6, wherein the plurality of fins have a length in the extension direction that is 20% or less of the length of the upper and lower panels in the extension direction.

8. The heat exchange tube of any one of claims 1-4, further comprising a side barrier disposed at the at least one side edge of the upper and lower panels, the side barrier including a separation structure for sandwiching between the upper and lower panels to maintain a spacing therebetween, the side barrier enclosing with the upper and lower panels an interior channel of the heat exchange tube.

9. The heat exchange tube of claim 3 or 4, wherein the sealing clip encloses the upper and lower panels to form an interior channel of the heat exchange tube.

10. A heat exchanger comprising a housing having an interior space and a plurality of heat exchange tubes supported on and passing through the interior space of the housing, wherein at least one of the heat exchange tubes is a heat exchange tube as claimed in any one of claims 1 to 9.

11. The heat exchanger of claim 10, wherein the housing comprises two sealing plates disposed opposite to each other, a plurality of mounting through holes are formed in the sealing plates, two ends of the at least one heat exchange tube are engaged with the mounting through holes and are connected in a sealing manner, and the body of the sealing buckle has an arc-shaped profile adapted to the mounting through holes on a second side opposite to the first side.

12. A sealing clip for a heat exchange tube as set forth in claim 1, including a body and upper and lower clamping wings extending from upper and lower edges of the body toward the first side, the upper and lower clamping wings being opposite each other and forming a clip groove with the body.

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