CN212179644U - Heat exchange tube, heat exchanger and hot water equipment - Google Patents

Abstract

The application discloses heat exchange tube, heat exchanger and hot water equipment. The heat exchange tube comprises a tube body and a plurality of fins fixedly sleeved outside the tube body; a flow guide structure is arranged on the outer edge of part of the fin; and a flow guide flue is formed between the flow guide structure and the outer wall of the pipe body. The application provides a heat exchange tube, heat exchanger and hot water equipment can improve flue gas flow path, promotes heat exchange efficiency.

Description

Heat exchange tube, heat exchanger and hot water equipment

Technical Field

The application relates to the technical field of hot water equipment, in particular to a heat exchange tube, a heat exchanger and hot water equipment.

Background

The heat exchanger of the existing gas water heater is provided with a heat exchange tube for exchanging heat with flue gas. For increase outside of tubes heat transfer area, increase the heat transfer volume of heat exchange tube, the heat exchange tube generally adopts the finned tube, and a lot of fins are processed on the finned tube passes through the surface of body for original surface obtains the extension, promotes heat transfer area, promotes the heat transfer volume.

However, the fins of the existing finned tube and the interval gaps among the fins are outwards opened, so that the contact between the flue gas flow and the tube body is insufficient, and the heat exchange efficiency is not high.

In addition, for promoting the heat exchange efficiency of finned tube, through establish the flue gas separation blade in some water heaters in addition on one side of the finned tube for flue gas and finned tube fully contact and avoid the flue gas to flow too fast, promote heat exchange efficiency, but this will lead to manufacturing cost to increase, and in addition, the position of flue gas separation blade need be installed in the clearance export one side of adjacent two rings of finned tubes, and installation accuracy control is more difficult, and the installation degree of difficulty is great, but if the mounted position of flue gas separation blade is inaccurate then can influence heat exchange efficiency by a wide margin.

SUMMERY OF THE UTILITY MODEL

In view of the above insufficiency, an object of the present application is to provide a heat exchange pipe, a heat exchanger and a hot water device, so as to improve a flue gas flow path and improve heat exchange efficiency.

Another object of the present application is to provide a heat exchange pipe, a heat exchanger, and a hot water apparatus that can reduce costs and are easy to install.

In order to achieve at least one of the above purposes, the following technical scheme is adopted in the application:

the heat exchange tube comprises a tube body and a plurality of fins fixedly sleeved outside the tube body; a flow guide structure is arranged on the outer edge of part of the fin; and a flow guide flue is formed between the flow guide structure and the outer wall of the pipe body.

As a preferred embodiment, the fin has a first portion provided with the flow guide structure at an outer edge and a second portion not provided with the flow guide structure at an outer edge; in the case where a part of the fins is cut at the same central angle, the heat exchange area of the cut portion of the first section is larger than that of the cut portion of the second section.

In a preferred embodiment, in the case that a part of the fins is cut at the same central angle, the difference between the heat exchange area of the cut part of the first part and the heat exchange area of the cut part of the second part is approximately the heat exchange area of the flow guiding structure of the cut part.

As a preferred embodiment, at least part of the length of the flow guiding structure has a preset width; the width direction is the spacing direction of two adjacent fins; the preset width is more than 0.9 time of the distance between two adjacent fins.

In a preferred embodiment, in two adjacent fins, the flow guide structure of one fin is in contact fit with the other fin.

As a preferable embodiment, the ratio of the attaching length of the flow guide structure to the length of the entire flow guide structure is 0.8 or more.

In a preferred embodiment, at least part of the length of the flow directing structure is of constant width as it extends around the tubular body.

In a preferred embodiment, the flow-guiding flue extends around the pipe body over at least part of its length with a constant flow area.

In a preferred embodiment, the distance between the outer edge of the fin without the flow guide structure and the outer wall of the tube body is L1, and the distance between the flow guide structure and the tube body is L2, wherein 0.5L1 is equal to or less than L2 is equal to or less than 1.5L 1.

As a preferred embodiment, a flue gas inlet and a flue gas outlet which are communicated with the diversion flue are arranged between two adjacent fins; wherein the heat exchange tube has an incident flow side facing the flue gas and a back flow side facing away from the flue gas; the flue gas outlet is located the back flow side, the water conservancy diversion structure is located the circumference both sides of flue gas outlet.

In a preferred embodiment, the lengths of the flow guiding structures at the two circumferential sides of the flue gas outlet are equal.

As a preferred embodiment, the flue gas inlet is located on the upstream side; the length of the smoke inlet along the circumferential direction is greater than that of the smoke outlet.

In a preferred embodiment, the flow guiding structure is located on the back flow side, and the length of the flow guiding structure is more than half of the length of the flow guiding structure.

In a preferred embodiment, the flow guide structure extends in the circumferential direction.

As a preferred embodiment, the flow guide structure and the fin are an integral structure, and the flow guide structure is a flow guide flange located at the outer edge of the fin.

As a preferred embodiment, the length of the flue gas inlet in the circumferential direction is less than half of the circumference of the outer edge of the fin.

In a preferred embodiment, the distance between the flow guide structure and the pipe body is L2; the length of the smoke outlet along the direction surrounding the pipe body is 0.5L2-3L 2. (whether there is a range of ratios)

In a preferred embodiment, the length of the guide flange is 0.3-0.7 of the length of the outer edge of the fin along the direction surrounding the tube body.

In a preferred embodiment, the flue gas outlets of the first part of the number of fins are aligned in the arrangement direction on the pipe body; the smoke outlets of the fins of the second part number are aligned along the arrangement direction and staggered with the smoke outlets of the first part number in the circumferential direction.

As a preferred embodiment, the flue gas outlets of the first part number of fins and the flue gas outlets of the second part number of fins are circumferentially staggered by 90 degrees.

A heat exchanger, the heat exchange tube that the spiral is coiled; the heat exchange tube comprises a tube body and a plurality of fins fixedly sleeved outside the tube body; a flow guide structure is arranged on the outer edge of part of the fin; and a flow guide flue is formed between the flow guide structure and the outer wall of the pipe body.

As a preferred implementation mode, the outer edges of the fins of two adjacent circles of heat exchange tubes are attached.

In a preferred embodiment, the heat exchange tube comprises an inner layer coil and an outer layer coil surrounding the inner layer coil; a partition plate is arranged between the inner-layer coil pipe and the outer-layer coil pipe; and the smoke outlet of the diversion flue of the inner-layer coil pipe faces the partition plate.

In a preferred embodiment, the outer coil is helically coiled about a central axis; the direction of the smoke outlet of the outer layer coil pipe is parallel to the central axis.

In a preferred embodiment, in the outer-layer coil, the flue gas outlet of the diversion flue of one circle of heat exchange tubes faces the flue gas inlet of the diversion flue of the next circle of heat exchange tubes.

A water heating apparatus, comprising: a heat exchanger as claimed in any one of the preceding embodiments.

Has the advantages that:

the heat exchange tube that this application embodiment provided utilizes the water conservancy diversion structure on the fin to form the water conservancy diversion flue, and this water conservancy diversion flue can avoid the flue gas to spread outward between the fin with flue gas water conservancy diversion to the body surface of heat exchange tube, promotes the heat exchange efficiency of heat exchange tube.

In addition, the heat exchange tube provided by the embodiment does not need to install a smoke baffle in the heat exchanger, reduces the installation difficulty, and has practical value.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a cross-sectional view of a heat exchanger provided in an embodiment of the present application;

FIG. 2 is a schematic view of the heat exchange tube of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a schematic view of the fin structure of FIG. 2;

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a schematic exterior view of a portion of the heat exchange tube of FIG. 1;

FIG. 7 is another view of FIG. 6;

FIG. 8 is a smoke flow path diagram of the inner layer coil of FIG. 2;

figure 9 is a smoke flow path diagram of the outer layer coil of figure 2.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1 to 9. An embodiment of the present application provides a heat exchange tube 500, the heat exchange tube 500 includes the body 20 and fixed cover locates a plurality of fins 1 outside the body 20. A part of the outer edge 8 of the fin 1 is provided with a flow guide structure 3; a flow guide flue 6 is formed between the flow guide structure 3 and the outer wall of the pipe body 20.

The heat exchange tube 500 provided by this embodiment utilizes the flow guide structure 3 on the fin 1 to form the flow guide flue 6, and the flow guide flue 6 can guide the flue gas to the surface of the tube body 20 of the heat exchange tube 500, so as to prevent the flue gas from diffusing outwards between the fins 1 and improve the heat exchange efficiency of the heat exchange tube 500.

In addition, the heat exchange tube 500 that adopts this embodiment to provide need not to install the flue gas separation blade in the heat exchanger, reduces the installation degree of difficulty, has practical value very much.

In the present embodiment, as shown in fig. 4 and 5, the fin 1 may include a ring-shaped body 2, and a flow guiding structure 3 located on a part of an outer edge 8 of the ring-shaped body 2. The annular body 2 is preferably circular, but may be other shapes, such as rectangular ring, other polygonal ring, and the like. The surfaces of the annular bodies 2 of two adjacent fins 1 are parallel and can be both approximately perpendicular to the outer surface of the tube body 20.

A gap is formed between two adjacent annular bodies 2, the flow guiding structure 3 covers the gap at the outer edge 8 of the annular bodies 2, and the flow guiding structure 3, the (walls of the) two adjacent annular bodies 2, and the outer wall of the tube 20 may form a flow guiding flue 6. The diversion structure 3 can prevent the flue gas from entering the diversion flue 6 to diffuse outwards, ensure the flue gas to exchange heat with the fins 1 and the pipe body 20 as much as possible, and further improve the heat exchange efficiency.

In this embodiment, the flow guiding structure 3 extends along the outer edge 8 of the annular main body 2, the flow guiding structure 3 and the annular main body 2 may form a bending structure, and the flow guiding structure 3 and the annular main body 2 may be perpendicular to each other, and of course, may also be an acute angle or an obtuse angle, which is not limited in this application.

As shown in fig. 4 and 5, the flow guide structure 3 extends along the circumferential direction, the flow guide structure 3 is an arc-shaped structure and extends along the circumferential direction at the outer edge 8 of the annular main body 2, and at this time, the flow guide structure 3 is a rectangular strip in the flat state. The flow guide structure 3 and the fin 1 are of an integral structure, and the flow guide structure 3 is a flow guide flanging positioned at the outer edge 8 of the fin 1. Preferably, the fin 1 is formed by stamping. In other embodiments, the baffle structure 3 may be a non-flanged structure, which may be a shielding strip welded to the outer edge 8 of the annular main body 2.

The fin 1 further has an inner ring 7, and one end of the inner ring 7 has a plurality of positioning protrusions 9 in the circumferential direction. As shown in fig. 4 and 5, the fin 1 has three positioning protrusions 9 on the inner ring 7. Two adjacent fins 1 can be positioned through the positioning protrusions 9, and the target distance between the two adjacent fins 1 is guaranteed. Certainly, the adjacent fins 1 of the heat exchange tube 500 of the embodiment can also be attached and positioned through the flow guide structure 3, and the fins 1 can be combined with the inner ring 7 through the flow guide structure 3 to perform the dual positioning protrusion 9 on the tube body 20, so that the accurate positioning between the adjacent fins 1 can be ensured, and the installation is convenient.

The heat exchange area of the fin 1 can be increased by additionally arranging the flow guide structure 3, and then the heat exchange efficiency of the heat exchange tube 500 is increased. Specifically, the fin 1 has a first portion with an outer edge 8 provided with the flow guide structure 3 and a second portion with the outer edge 8 not provided with the flow guide structure 3, and when one portion of the fin 1 is cut at the same central angle α, the heat exchange area of the cut portion of the first portion is larger than that of the cut portion of the second portion.

Further, in the case that a part of the fins 1 is cut at the same central angle, the difference between the heat exchange area of the cut part of the first part and the heat exchange area of the cut part of the second part is approximately the heat exchange area of the cut part of the flow guiding structure 3.

For ease of understanding, the schematic nature is exemplified by: as shown in fig. 5, taking a central angle of 30 degrees (α is 30 degrees) as an example, a part of the flow guiding structure 3 (corresponding to the central angle of 30 degrees) is added in the cut part of the first part compared with the cut part of the second part, and accordingly, the heat exchange area of the part of the flow guiding structure 3 is increased, and the heat exchange efficiency is improved.

In this embodiment, at least part of the length of the flow guiding structure 3 has a predetermined width. The width direction is a distance direction between two adjacent fins 1, and is an H direction in fig. 7. The whole diversion flue 6 except the flue gas inlet 4 and the flue gas outlet 5 is a substantially closed flow channel, so that the flue gas is prevented from overflowing outwards in the flowing process of the diversion flue 6, and the heat exchange efficiency of the heat exchange tube 500 is ensured.

In order to form a closed flow passage and avoid the overflow of smoke, the preset width is more than 0.9 time of the distance between two adjacent fins 1. Of course, the width direction of the flow guide structure 3 may be the extending direction/length direction of the pipe body 20, and is the H direction in fig. 7. The length direction of the flow guide structure 3 is along the direction surrounding the tube body 20, and is perpendicular to the width direction thereof, and in the case that the fin 1 has a circular ring body, the length direction of the flow guide structure 3 may be along the circumferential direction.

The preset width may be a range value or a fixed value, and may be understood as: the width of the flow-guiding structure 3 varies over part of its length in the circumferential direction, for example the width of the flow-guiding structure 3 varies over at least part of its length between 0.9L-L (L being the spacing between two fins 1). Alternatively, at least part of the length of the flow directing structure 3 may extend around the tube 20 with a constant width. For example, the width of the flow guiding structure 3 is L for the entire length, and the flow guiding structure 3 is a rectangular strip when laid flat. The length of at least part of the flow guide structure 3 may be more than 0.5 times of the total length of the flow guide structure 3, and further, in this embodiment, the flow guide structure 3 of the whole length has a preset width equal to the distance between the two fins 1.

Of course, in other embodiments, the width of the flow guiding structure 3 may be even greater than the distance between two fins 1, and the flow guiding structure 3 may overlap adjacent fins 1.

In this embodiment, in two adjacent fins 1, the guide structure 3 of one fin 1 contacts and attaches to another fin 1, so can avoid flue gas excessive to the utmost, promote heat exchange efficiency, form confined water conservancy diversion flue 6. Moreover, the guide structure 3 is attached to the fin 1, so that the fin 1 can be positioned when being installed, and the fin is convenient to install. In order to ensure that the flue gas flows around the pipe body 20 as much as possible and avoid outward diffusion, the attachment length of the flow guide structure 3 accounts for the whole length ratio of the flow guide structure 3 to be more than 0.8. Preferably, the flow guide structures 3 with the whole length are attached to the fins 1.

To avoid an increase in the resistance to the flow of flue gases, the flow area is constant over at least part of the length of the flue duct 6 extending around the tube 20. The radial dimension of the flow guiding flue 6 does not change when extending around the pipe body 20. Specifically, as shown in fig. 5, a distance between the outer edge 8 of the fin 1, where the flow guide structure 3 is not disposed, and the outer wall of the tube body 20 is L1, and a distance between the flow guide structure 3 and the tube body 20 is L2, where L2 is 0.5L1 or more and 1.5L1 or more. In the present embodiment, the distance between the flow guiding structure 3 and the tube body 20 is equal to the distance between the fin 1 without the outer edge 8 of the flow guiding structure 3 and the outer wall of the tube body 20, that is, L2-L1.

As shown in fig. 6 and 7, a flue gas inlet 4 and a flue gas outlet 5 which are communicated with the diversion flue 6 are arranged between two adjacent fins 1. The outer edges of two adjacent fins 1, which are not provided with the diversion structures 3, participate in forming the flue gas inlet 4. Wherein the heat exchange tube 500 has an incident flow side 10 facing the flue gas and a back flow side 11 facing away from the flue gas. The flue gas outlet 5 is located the side 11 that flows backwards, and flue gas inlet 4 is located and meets the side 10, water conservancy diversion structure 3 is located the circumference both sides of flue gas outlet 5. The lengths of the flow guide structures 3 positioned at the two circumferential sides of the flue gas outlet 5 are equal.

To the incident flow side 10 of the heat exchange tube 500, the flue gas flows towards the surface thereof, and then has a better heat exchange effect, and to the back flow side 11, under the condition that the diversion structure 3 is not arranged, the flue gas continues to flow forward after passing through the incident flow side 10 and is difficult to contact with the back flow side 11 for heat exchange, resulting in a poor heat exchange effect of the back flow side 11, the diversion structure 3 and the diversion flue 6 formed by the diversion structure are arranged in the embodiment, so that the flue gas enters the diversion flue 6 after passing through the incident flow side 10 and is not diffused in a free flow manner, the flue gas exchanges heat with the fin 1 and the tube body 20 in the flowing process of the diversion flue 6, and the overall heat exchange efficiency of the heat exchange tube 500 is improved. Wherein the flow guiding structure 6 covers more than half of the back flow side in a direction around the tube body 20. Correspondingly, the guide flue 6 covers more than half of the back flow side 11 in the direction around the tube body 20. As shown in fig. 5 and 6, the parts of the back flow side 11 except the flue gas outlet 5 are covered with the flow guiding structure 3.

Bearing in mind the above, the flue gas inlet 4 is located on the incident flow side 10. The length of the flue gas inlet 4 in the circumferential direction is greater than that of the flue gas outlet 5. More than half the length of the flow guiding structure 3 is located at the back flow side 11. In the case of the tube 20 being a circular tube, half of the tube 20 is the incident flow side 10 (corresponding to a central angle of 180 degrees), and the other half is the back flow side 11. Preferably, all the flow guiding structures 3 are located on the back flow side 11, the flue gas inlet 4 is located on the incident flow side 10, and the covered central angle is also 180 degrees. In order to improve the flue gas gathering and flow guiding effect, the length of the flue gas inlet 4 along the circumferential direction (circumferential direction) is less than half of the circumference of the outer edge 8 of the fin 1. In this embodiment the length of the flue gas inlet 4 in the circumferential direction is half the circumference of the outer edge 8 of the fin 1.

In this embodiment, the distance between the flow guiding structure 3 and the pipe body is L2; the length of the smoke outlet 5 in the direction around the tube 20 is 0.5L2-3L2(0.5 times L2 to 3 times L2). For example: the length of the fume outlet 5 is 3mm-10mm in the direction around the tube body 20. The flue gas outlet 5 is positioned between the two diversion flanges (diversion structures 3). The diversion structure 3 constructs a diversion flue 6 between the flue gas outlet 5 and the flue gas inlet 4 to communicate the flue gas outlet 5 and the flue gas inlet 4. The ratio of the length of the flow guiding structure 3 to the length of the outer edge 8 of the fin 1 in the direction around the tube body 20 is 0.3-0.7. Preferably, the distance between the flow guide structure and the pipe body is L2; the length of the smoke outlet in the direction around the pipe body is 0.5L2-3L2 and is more than 0.5.

In the tube body 20, the flue gas outlets 5 of the first partial number of fins 1 are aligned in the direction of arrangement. The fume outlets 5 of the second part number of fins 1 are aligned along the arrangement direction and staggered with the fume outlets 5 of the first part number in the circumferential direction. Specifically, the flue gas outlets 5 of the first partial number of fins 1 and the flue gas outlets 5 of the second partial number of fins 1 are staggered by 90 degrees in the circumferential direction. When the heat exchange tube 500 is coiled, the heat exchange tubes with the lengths corresponding to the first part number of the fins 1 can form an inner layer coil, and the heat exchange tubes with the lengths corresponding to the second part number of the fins 1 can form an outer layer coil.

Based on the same conception, the embodiment of the present invention further provides a heat exchanger and a water heating device, as described in the following embodiments. Because the principle of the heat exchanger and the water heating device for solving the problems and the technical effect which can be obtained are similar to the heat exchange tube 500, the implementation of the heat exchanger and the water heating device can refer to the implementation of the heat exchange tube 500, and repeated parts are not described again.

Please continue to refer to fig. 1 to 9. An embodiment of the present application also provides a heat exchanger, a spirally wound heat exchange tube 500. The heat exchange tube 500 includes a tube body 20 and a plurality of fins 1 fixedly sleeved outside the tube body 20. A part of the outer edge 8 of the fin 1 is provided with a flow guide structure 3; a flow guide flue 6 is formed between the flow guide structure 3 and the outer wall of the pipe body 20. The heat exchange tube 500 can be the heat exchange tube 500 described in any of the above embodiments, and the repeated descriptions are omitted.

In order to avoid the flue gas from escaping between the heat exchange tubes 500 and facilitate the flue gas to enter the diversion flue 6, the outer edges 8 of the fins 1 of the heat exchange tubes 500 are attached to each other in two adjacent circles. The joint position on the inner-layer coil pipe 300 can be the end part of the flow guide structure 3 or the boundary position of the flow guide structure 3 and the flue gas inlet 4. So can avoid forming other flue gas exhaust route between adjacent two circles of heat exchange tubes 500 for the flue gas is in the best all entering into water conservancy diversion flue 6 after flue gas inlet 4, makes whole flue gas participate in the heat transfer of back flow side 11 body 20 and fin 1, promotes heat exchange efficiency.

In this embodiment, as shown in fig. 1, 2 and 3, the heat exchange tube 500 includes an inner layer coil 300 and an outer layer coil 400 surrounding the inner layer coil 300. A spacer plate 600 is arranged between the inner layer coil 300 and the outer layer coil 400. The flue gas outlet 5 of the diversion flue 6 of the inner-layer coil 300 faces the partition plate 600. The heat exchange pipe 500 of the heat exchanger can be divided into a combustion section and a condensation section by providing the partition plate 600.

The heat exchanger has a casing 100, and the casing 100 has a hollow cylindrical shape as a whole. The partition plate 600 is a cylindrical structure in the casing 100 and is located between the outer coil 400 and the inner coil 300. The enclosure 100 has an exhaust port 700 in a side wall thereof, the exhaust port 700 being located at substantially one end of the enclosure 100 and opening into the interior of the enclosure 100. An outer space for accommodating the outer coil 400 is formed between the partition plate 600 and the case 100. In order to prevent the flue gas from flowing outside the heat exchange tube 500, so that the flue gas flows in the diversion flue 6 as much as possible, and the heat exchange effect is improved, the distance between the shell 100 and the partition plate 600 may be equal to the outer diameter of the heat exchange tube 500 (the outer diameter of the outer edge 8 of the fin 1). The outer coil 400 is attached to the inner wall of the casing 100 and the outer wall of the partition 600.

The outer coil 400 is helically coiled about a central axis. Accordingly, the inner coil 300 is also helically coiled about the central axis. The flue gas outlet 5 of the outer layer coil 400 is oriented parallel to the central axis. Specifically, in the outer-layer coil 400, the flue gas outlet 5 of the diversion flue 6 of one heat exchange tube 500 faces the flue gas inlet 4 of the diversion flue 6 of the next heat exchange tube 500. Wherein the flue gas outlet 5 of the outer layer spiral coil faces perpendicular to the flue gas outlet 5 of the inner layer coil 300. The flue gas outlet 5 of the inner layer coil 300 is oriented perpendicular to the partition plate 600. The flue gas outlet 5 of the outer layer coil 400 is parallel to the partition 600.

The partition plate 600 in the heat exchanger of this embodiment is only required to be placed between the outer layer coil 400 and the inner layer coil 300, and is relatively easy to install. The inner coil 300 is internally provided with the combustion chamber 200, and the inner coil 300 surrounds the combustion chamber 200. The flue gas flows outwardly from the inner coil 300 with the opening of the flue gas inlet 4 facing inwardly and the opening of the flue gas outlet 5 facing outwardly. The flue gas firstly enters the diversion flues 6 at the upper side and the lower side (in the direction facing to the figure 8) through the flue gas inlet 4, so that the flue gas flows around the pipe body 20 to perform sufficient heat exchange with the pipe body 20 and the fins 1 while avoiding outward diffusion, and the heat exchange efficiency is improved. When the flue gas is outwards discharged from the flue gas outlet 5, most of the pipe bodies 20 can be seen to be in contact with the flue gas for heat exchange, so that the heat exchange of the upstream side 10 and the back flow side 11 of the pipe bodies 20 is avoided to be uneven, the temperature difference is large, and the heat exchange efficiency is influenced.

In the present embodiment, as shown in fig. 8 and fig. 9, a flue gas flowing gap 601 is formed between the partition plate 600 and the inner-layer coil 300, and the flue gas discharged from the flue gas outlet 5 enters the flue gas flowing gap 601, flows down to the diversion flue 6 of the bottom heat exchange tube 500, enters the external space through the flue gas outlet 5 of the bottom heat exchange tube 500, enters the diversion flue 6 of the heat exchange tube 500 from the flue gas inlet 4 which is open downwards, and flows around the tube body 20 through the diversion flue 6 until the flue gas outlet 5 is discharged. The flue gas outlet 5 is opposite to the middle position of the flue gas inlet 4 of the next circle of heat exchange tubes 500, the edge discharged from the flue gas outlet 5 enters the flue gas inlet 4 and flows to the two sides of the flue gas inlet around the tube body 20 until entering the diversion flue 6, and finally is discharged from the flue gas outlet 5, the flue gas flows step by step until flowing out of the uppermost heat exchange tube 500, and finally is discharged out of the heat exchanger through the smoke outlet 700.

An embodiment of the present application also provides a water heating apparatus, including: a heat exchanger as claimed in any one of the preceding embodiments. The water heating device can be a gas water heating device, more specifically, the water heating device can be a gas water heater, a wall-mounted furnace or a condensing water heater, and of course, the water heating device can also be a heating furnace.

Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed inventive subject matter.

Claims (26)

1. The heat exchange tube is characterized by comprising a tube body and a plurality of fins fixedly sleeved outside the tube body; a flow guide structure is arranged on the outer edge of part of the fin; and a flow guide flue is formed between the flow guide structure and the outer wall of the pipe body.

2. The heat exchange tube of claim 1, wherein the fin has a first portion having an outer edge provided with the flow directing structure and a second portion having an outer edge not provided with the flow directing structure; in the case where a part of the fins is cut at the same central angle, the heat exchange area of the cut portion of the first section is larger than that of the cut portion of the second section.

3. The heat exchange tube of claim 2, wherein the difference between the heat exchange area of the first sectioned portion and the heat exchange area of the second sectioned portion is approximately the heat exchange area of the sectioned flow guide structure in the case where a portion of the fins is sectioned at the same central angle.

4. The heat exchange tube of claim 1, wherein at least part of the length of the flow directing structure has a predetermined width; the width direction is the spacing direction of two adjacent fins; the preset width is more than 0.9 time of the distance between two adjacent fins.

5. The heat exchange tube of claim 1, wherein the flow guide structure of one of the fins is attached in contact with the other of the fins in two adjacent fins.

6. The heat exchange tube of claim 5, wherein the length ratio of the attached length of the flow guide structure to the entire flow guide structure is more than 0.8.

7. A heat exchange tube according to claim 1, wherein at least part of the length of the flow directing structure is of constant width as it extends around the tube body.

8. A heat exchange tube according to claim 1, wherein at least part of the length of the draft flue has a constant flow area as it extends around the tube.

9. The heat exchange tube of claim 1, wherein the distance between the outer edge of the fin where the flow guide structure is not provided and the outer wall of the tube body is L1, and the distance between the flow guide structure and the tube body is L2, wherein 0.5L1 ≤ L2 ≤ 1.5L 1.

10. The heat exchange tube of claim 1, wherein a flue gas inlet and a flue gas outlet which are communicated with the diversion flue are arranged between two adjacent fins; wherein the heat exchange tube has an incident flow side facing the flue gas and a back flow side facing away from the flue gas; the flue gas outlet is located the back flow side, the water conservancy diversion structure is located the circumference both sides of flue gas outlet.

11. The heat exchange tube of claim 10, wherein the flow guide structures on both circumferential sides of the flue gas outlet are of equal length.

12. The heat exchange tube of claim 10, wherein the flue gas inlet is located on the incident flow side; the length of the smoke inlet along the circumferential direction is greater than that of the smoke outlet.

13. The heat exchange tube of claim 10, wherein more than half the length of the flow directing structure is on the back flow side.

14. The heat exchange tube of claim 1, wherein the flow directing structure extends in a circumferential direction.

15. The heat exchange tube of claim 1, wherein the flow directing structure and the fin are a unitary structure, and the flow directing structure is a flow directing bead located at an outer edge of the fin.

16. The heat exchange tube of claim 10, wherein the flue gas inlet has a length in the circumferential direction of less than half of the circumference of the outer edge of the fin.

17. The heat exchange tube of claim 10, wherein the flow directing structure is spaced from the tube body by a distance L2; the length of the smoke outlet along the direction surrounding the pipe body is 0.5L2-3L 2.

18. The heat exchange tube of claim 10, wherein the length of the deflector flange in the direction around the tube body is in the range of 0.3 to 0.7 in proportion to the length of the outer edge of the fin.

19. The heat exchange tube of claim 10, wherein the flue gas outlets of the first partial number of fins are aligned in the direction of the row on the tube body; the smoke outlets of the fins of the second part number are aligned along the arrangement direction and staggered with the smoke outlets of the first part number in the circumferential direction.

20. The heat exchange tube of claim 10, wherein the flue gas outlets of the first partial number of fins and the flue gas outlets of the second partial number of fins are circumferentially staggered by 90 degrees.

21. A heat exchanger, characterized by a helically coiled heat exchange tube; the heat exchange tube comprises a tube body and a plurality of fins fixedly sleeved outside the tube body; a flow guide structure is arranged on the outer edge of part of the fin; and a flow guide flue is formed between the flow guide structure and the outer wall of the pipe body.

22. The heat exchanger of claim 21, wherein the outer edges of the fins of two adjacent turns of the heat exchange tube are abutted.

23. The heat exchanger of claim 21, wherein the heat exchange tubes comprise an inner coil and an outer coil surrounding the inner coil; a partition plate is arranged between the inner-layer coil pipe and the outer-layer coil pipe; and the smoke outlet of the diversion flue of the inner-layer coil pipe faces the partition plate.

24. The heat exchanger of claim 23, wherein the outer layer coil is helically wound about a central axis; the direction of the smoke outlet of the outer layer coil pipe is parallel to the central axis.

25. The heat exchanger of claim 23, wherein the flue gas outlet of the diversion flue of one turn of heat exchange tubes faces the flue gas inlet of the diversion flue of the next turn of heat exchange tubes in the outer coil.

26. A water heating apparatus, comprising: a heat exchanger as claimed in any one of claims 21 to 25.

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