CN217032168U - Pipeline vortex structure, heat exchange assemblies and water heater - Google Patents

Abstract

The utility model discloses a pipeline turbulence structure, a heat exchange assembly and a water heater, wherein the pipeline turbulence structure comprises: the spoiler, the spoiler is the slice, the spoiler extends along the helix on length direction, the spoiler is formed with a plurality of sawtooth at least one side border of width direction, the sawtooth is protruding towards the inner wall of pipeline, and is a plurality of the sawtooth is in interval arrangement in length direction of spoiler. According to the pipeline turbulence structure, the turbulence sheet extending along the spiral line is arranged in the length direction of the turbulence sheet, so that water passing through the turbulence sheet generates rotational flow, high-temperature water on a fire-facing surface and low-temperature water at other positions are fully disturbed and mixed, local high temperature is reduced, the vaporization degree is reduced, the boundary layer of the inner wall surface of the heat exchange pipe is damaged by arranging the sawteeth on one side of the width direction of the turbulence sheet facing the inner wall of the pipeline, a part of steam bubbles are punctured, the generation of large steam bubbles is inhibited, the vaporization noise is reduced, and the risk of dry combustion and cracking of the heat exchange pipe is avoided.

Description

Pipeline vortex structure, heat exchange assembly and water heater

Technical Field

The utility model relates to the technical field of heat exchangers, in particular to a pipeline turbulence structure, a heat exchange assembly and a water heater.

Background

In the related art, it is pointed out that the gas water heater can achieve higher load compared with the electric heating water storage type water heater, i.e. the gas water heater can heat water and has large water volume, and the gas water heater becomes one of the main water heaters in the market. However, because the load is high and the heat flow density is high, the heat exchanger is easy to generate a process cold boiling phenomenon, vaporization noise similar to that of water boiling of a kettle is generated, the user experience is influenced by a light person, and the pipe is cracked and leaked due to dry burning caused by plunger flow generated by a serious person. Supercooling boiling refers to the phenomenon that the temperature of a liquid main body is lower than the saturation temperature under corresponding pressure, the temperature of a wall surface is higher than the saturation temperature, when the temperature difference between the two reaches a certain value, bubbles begin to be generated on the inner wall of a pipe, vaporization occurs, and condensation disappears when the bubbles contact with under-heated water. The heat exchanger vibrates and generates noise due to water flow disturbance caused by motion factors such as generation, growth, separation, collapse and the like of steam bubbles. When the vaporization is serious, large-section bubbles are generated in the tube, liquid-phase water is blocked by the bubbles to form plug flow, so that dry burning is formed at the bubble position, and the tube is cracked for a long time and fails.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a pipeline turbulence structure, wherein a spoiler extending along a spiral line is arranged in the length direction of the spoiler, so that water passing through the spoiler generates rotational flow, high-temperature water on a fire-facing surface and low-temperature water at other positions are fully disturbed and mixed, local high temperature is reduced, and the vaporization degree is reduced.

The utility model also provides a heat exchange assembly with the pipeline turbulent flow structure.

The utility model also provides a water heater with the heat exchange assembly.

The duct spoiler structure according to the first aspect of the present invention includes: the spoiler, the spoiler is the slice, the spoiler extends along the helix on length direction, the spoiler is formed with a plurality of sawtooth at least one side border of width direction, the sawtooth is protruding towards the inner wall of pipeline, and is a plurality of the sawtooth is in interval arrangement in length direction of spoiler.

According to the pipeline turbulence structure, the turbulence sheet extending along the spiral line is arranged in the length direction of the turbulence sheet, so that water passing through the turbulence sheet generates rotational flow, high-temperature water on a fire-facing surface and low-temperature water at other positions are fully disturbed and mixed, local high temperature is reduced, the vaporization degree is reduced, the boundary layer of the inner wall surface of the heat exchange pipe is damaged by arranging the sawteeth on one side of the width direction of the turbulence sheet facing the inner wall of the pipeline, a part of steam bubbles are punctured, the generation of large steam bubbles is inhibited, the vaporization noise is reduced, and the risk of dry combustion and cracking of the heat exchange pipe is avoided.

In some embodiments, the width direction of the spoiler at any position is perpendicular to a center line of the spoiler spiral extension.

In some embodiments, a plurality of concave grooves are formed at both side edges of the spoiler in the width direction, and the serrations are formed between two adjacent grooves.

In some embodiments, the serrations are rectangular, trapezoidal, triangular, or arcuate in shape.

In some embodiments, the height of the saw teeth is 0.1mm-3mm, the width of the saw teeth is 0.1mm-3mm, and/or the distance between two adjacent saw teeth is 1mm-3 mm.

In some embodiments, the spoiler has a twist ratio of 1-10.

In some embodiments, a spoiler portion is formed on the spoiler, the spoiler portion is a spoiler protrusion, a spoiler rib and/or a spoiler flange protruding from the surface of the spoiler, and/or the spoiler portion is a spoiler hole penetrating through the spoiler in the thickness direction.

In some embodiments, further comprising: the spoiler is in a spiral coil shape and sleeved with the spoiler, and the spoiler is fixed on the spoiler.

The heat exchange assembly comprises a heat exchange tube and the tube turbulence structure, wherein the tube turbulence structure is arranged in the heat exchange tube, and the free ends of the sawteeth extend to the inner wall of the heat exchange tube.

According to the heat exchange assembly, the overall performance of the heat exchange assembly is improved by arranging the pipeline turbulence structure in the first aspect.

In some embodiments, the inner surface of the heat exchange tube is formed with a raised rib extending along a spiral line in the length direction of the heat exchange tube.

The water heater according to the third aspect of the utility model comprises the heat exchange assembly according to the second aspect of the utility model.

According to the water heater, the heat exchange assembly in the second aspect is arranged, so that the overall performance of the water heater is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic view of a heat exchange assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the heat exchange assembly shown in FIG. 1;

FIG. 3 is an enlarged view at A shown in FIG. 2;

FIG. 4 is a schematic view of the spoiler shown in FIG. 3;

FIG. 5 is a hair growth diagram at B shown in FIG. 4;

FIG. 6 is a top view of the spoiler shown in FIG. 3;

figure 7 is a right side view of the spoiler shown in figure 3.

Reference numerals:

1000. a heat exchange assembly;

100. a heat exchange tube;

200. a pipeline turbulence structure;

210. a spoiler; 211. saw teeth; 211a, a spoiler; 212. a groove;

220. a spoiler;

300. a heat exchanger.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

First, referring to fig. 1-2, a heat exchange assembly 1000 according to an embodiment of the second aspect of the present invention will be briefly described, where the heat exchange assembly 1000 includes a heat exchange tube 100 and a tube turbulator structure 200 according to an embodiment of the first aspect of the present invention, and the tube turbulator structure 200 is disposed in the heat exchange tube 100.

A duct spoiler structure 200 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 and 7.

As shown in fig. 2, the duct spoiler structure 200 according to the embodiment of the first aspect of the present invention includes a spoiler 210.

Specifically, the spoiler 210 is sheet-shaped, in the length direction of the spoiler 210, the spoiler 210 extends along a spiral line, and thus, when water in the heat exchange tube 100 flows through the spoiler 210, the water may generate a rotational flow, so that high-temperature water on the fire-facing surface (which means the side of the heat exchange tube 100 close to the heat source) and low-temperature water at other positions are sufficiently stirred and mixed, thereby avoiding local high temperature, and simultaneously slowing down the vaporization degree, in the width direction of the spoiler 210, at least one side edge is formed with a plurality of saw teeth 211, the saw teeth 211 protrude toward the inner wall of the tube, and the plurality of saw teeth 211 are arranged at intervals in the length direction of the spoiler 210, so that the boundary layer of the inner wall of the heat exchange tube 100 is damaged by the saw teeth protruding toward the inner wall of the tube, thereby puncturing a part of steam bubbles, suppressing the generation of large steam bubbles, reducing the vaporization noise, and avoiding the dry burning and cracking of the heat exchange tube 100.

It should be noted that, the part of the heat exchange tube 100 close to the heat source is the fire-facing side, the tube wall temperature is higher, the temperature at other positions is lower, when the temperature difference between the two reaches a certain value, the inner wall of the heat exchange tube 100 on the fire-facing side starts to generate vapor bubbles to vaporize, and the water flow disturbance is caused by the generation, growth, separation, collapse and the like of the vapor bubbles, so that the water heater vibrates and generates noise. When the vaporization is serious, large bubbles are generated in the tube, and liquid-phase water is blocked by the bubbles, so that dry burning is formed at the bubble position, and the tube is cracked for a long time and fails.

For example, as shown in fig. 4, in the width direction of the spoiler 210, a plurality of saw teeth 211 are formed at both side edges, the plurality of saw teeth 211 are arranged at intervals in the length direction of the spoiler 210, and the saw teeth 211 face the inner wall of the pipe, so that when water flows through the spoiler 210, the water flow can generate a rotational flow, and further the water flows at different positions are mixed, thereby avoiding the occurrence of local high temperature, and meanwhile, due to the existence of the saw teeth 211, bubbles formed on the inner wall of the heat exchange pipe 100 can be further destroyed, the generation of large bubbles is inhibited, vaporization noise is reduced, and the heat exchange pipe 100 is prevented from being cracked due to dry combustion.

According to the pipe turbulence structure 200 provided by the utility model, the turbulence sheet 210 extending along the spiral line is arranged in the length direction of the turbulence sheet 210, so that water passing through the turbulence sheet 210 generates rotational flow, high-temperature water on the fire-facing side and low-temperature water at other positions are fully disturbed and mixed, local high temperature is reduced, the vaporization degree is reduced, the sawtooth 211 is arranged on one side of the width direction of the turbulence sheet 210 facing the inner wall of the pipe, the boundary layer of the inner wall surface of the heat exchange pipe 100 is damaged, a part of steam bubbles are punctured, the generation of large steam bubbles is inhibited, the vaporization noise is reduced, and the risk of dry combustion and cracking of the heat exchange pipe 100 is avoided.

In one embodiment of the present invention, as shown in fig. 4, the width direction of the spoiler 210 at any position is perpendicular to the spirally extending center line of the spoiler 210, so that it can be ensured that a plurality of saw teeth 211 on the spoiler 210 are protruded toward the inner wall of the heat exchange tube 100, which is beneficial to destroy bubbles formed on the inner wall of the heat exchange tube 100, and further, vaporization noise can be reduced.

In one embodiment of the present invention, as shown in fig. 5, a plurality of concave grooves 212 are formed at both side edges of the spoiler 210 in the width direction, and a serration 211 is formed between two adjacent grooves 212, so that the serration 211 is formed in the width direction of the spoiler 210, which is advantageous for breaking bubbles formed on the inner wall of the heat exchange tube 100.

In one embodiment of the present invention, referring to fig. 1, the serrations 211 have a rectangular, trapezoidal, triangular or arcuate shape, so that it is possible to achieve destruction of bubbles formed on the inner wall of the heat exchange tube 100, thereby reducing vaporization noise.

For example, as shown in fig. 5, the teeth 211 of the spoiler 210 are formed in a rectangular shape, so that when the water flow passes through the spoiler 210 to form a swirling flow, bubbles formed by vaporization of the water flow near the inner wall of the heat exchange pipe 100 are broken by the rectangular teeth 211, thereby suppressing the generation of large bubbles and reducing vaporization noise.

In one embodiment of the present invention, as shown in fig. 5, the height of the saw teeth 211 is 0.1mm to 3mm, that is, if the height of the saw teeth 211 is a (e.g., a shown in fig. 5), the value of a ranges from 0.1mm to 3mm, and in a specific implementation, the height of the saw teeth 211 can be set to 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3 mm; the width of the saw teeth 211 is 0.1mm to 3mm, that is, if the width of the saw teeth 211 is b (e.g., b shown in fig. 5), the value of b ranges from 0.1mm to 3mm, and in a specific implementation, the width of the saw teeth 211 may be set to 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3 mm; and/or if the distance between two adjacent saw teeth 211 is 1mm to 3mm, that is, if the distance between two adjacent saw teeth 211 is c (for example, c shown in fig. 5), the value of c ranges from 1mm to 3mm, and in a specific implementation, the distance between two saw teeth 211 may be set to be 1mm, 1.5mm, 2mm, 2.5mm, and 3 mm.

In an embodiment of the present invention, as shown in fig. 4, the twist ratio of the spoiler 210 is 1-10, it should be noted that, the twist ratio is too large, the spoiler effect is weak, and the vaporization noise reduction effect is not obvious; distortion ratio undersize, the resistance is too big, and water pressure is fixed time, and discharge reduces, influences the user and uses experience.

Wherein, the twist ratio of the spoiler 210 refers to a ratio of a pitch (e.g., d shown in fig. 4) of the spoiler 210 to a width (e.g., e shown in fig. 4) of the spoiler 210.

In specific implementation, the twist ratio of the spoiler 210 can be set to 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10, so that a certain spoiler effect can be ensured, and the influence on the use experience of a user due to overlarge resistance can be avoided under the condition of reducing vaporization noise.

For example, as shown in fig. 4, the twist ratio of the spoiler 210 is set to 5, so that a certain spoiler effect can be ensured, and the influence on the user experience due to too large resistance can be avoided under the condition of reducing vaporization noise.

Further, referring to fig. 4, the thickness of the spoiler 210 is 0.5mm to 2mm, and it should be noted that if the thickness of the spoiler 210 is less than 0.5mm, the spoiler 210 is easily deformed due to being too thin, and the service life of the spoiler 210 is affected; if the thickness of the spoiler 210 is greater than 2mm, the material waste due to the excessive thickness of the deflector increases the cost.

In a specific implementation, the thickness of the spoiler 210 may be set to 0.5mm, 1mm, 1.5mm, and 2mm, for example, in a specific implementation, the thickness of the spoiler 210 is set to 1.5mm, so that the spoiler 210 may ensure sufficient strength, avoid deformation during use, and prolong the service life of the spoiler 210.

In an embodiment of the present invention, as shown in fig. 4, a spoiler 211a is formed on the spoiler 210, the spoiler 211a is a spoiler protrusion, a spoiler rib, and/or a spoiler flange protruding from a surface of the spoiler 210, and/or the spoiler 211a is a spoiler hole penetrating through the spoiler 210 in the thickness direction, that is, the spoiler 211a may be formed as a protrusion and a rib, and may also be formed as a flange, and may also be formed as a spoiler hole penetrating through the spoiler 210 at the same time, so that the spoiler 211a may achieve an effect of breaking bubbles in the inner wall of the heat exchange tube 100.

Wherein, the spoiler 210 is a high temperature resistant member, and the spoiler 220 is a stainless steel member, a copper member or an aluminum member.

For example, referring to fig. 4, the spoiler 220 is a stainless steel member, and the spoiler 211a is formed as a spoiler flange, so that when water flows through the spoiler 210 to form a rotational flow, bubbles formed by vaporization of the water flow near the inner wall of the heat exchange tube 100 are destroyed by the spoiler flange, thereby suppressing generation of large bubbles and reducing vaporization noise.

In an embodiment of the present invention, as shown in fig. 3, the pipe spoiler structure 200 may further include a spoiler 220, the spoiler 220 is in a spiral coil shape and is sleeved outside the spoiler 210, and the spoiler 210 is fixed on the spoiler 220, so that the spoiler 220 further improves the damage of the pipe spoiler structure 200 to bubbles on the inner wall of the heat exchange pipe 100, and improves the uniformity of water flow heat exchange in the heat exchange pipe 100.

For example, as shown in fig. 4, the spoiler 220 is configured as a spring, the spring is sleeved outside the spoiler 210, and the spring is connected to the inner walls of the spoiler 210 and the heat exchange tube 100 by welding, on one hand, the spoiler 220 is fixed, so that the spoiler 210 or the spoiler 220 can be effectively prevented from moving relatively when being impacted by water flow, noise generation due to movement can be avoided, or noise generation due to unstable turbulence caused by movement that water flow directly impacts the inner wall of the heat exchange tube 100 can be avoided, or noise generation due to unstable turbulence formed in a local area in the heat exchange tube 100 can be avoided, on the other hand, the contact area between the pipe spoiler structure 200 and the inner wall of the heat exchange tube 100 can be increased, the spoiler effect can be further increased, the purpose of noise reduction can be achieved, and the use experience of a user can be improved.

The heat exchange assembly 1000 according to the second aspect of the present invention includes a heat exchange tube 100 and the tube turbulent flow structure 200 according to the first aspect of the present invention, the tube turbulent flow structure 200 is disposed in the heat exchange tube 100, and the free ends of the saw teeth 211 extend to the inner wall of the heat exchange tube 100 for destroying bubbles formed on the inner wall of the heat exchange tube 100.

According to the heat exchange assembly 1000 of the embodiment of the present invention, by providing the pipe turbulent flow structure 200 of the first aspect embodiment, the overall performance of the heat exchange assembly 1000 is improved.

In an embodiment of the present invention, referring to fig. 2, a raised rib is formed on the inner surface of the heat exchange tube 100, and the raised rib extends along a spiral line in the length direction of the heat exchange tube 100, so that when water flows through the heat exchange tube 100, the water flows through the spoiler 210 to generate a rotational flow, and the water in the rotational flow collides with the raised rib on the inner surface of the heat exchange tube 100, which can destroy bubbles formed on the inner surface of the heat exchange tube 100, thereby reducing bubbles formed on the inner surface of the heat exchange tube 100, suppressing generation of large bubbles, reducing vaporization noise, and avoiding the risk of dry burning and cracking of the heat exchange tube 100.

In one embodiment of the present invention, as shown in fig. 1, the heat exchange assembly 1000 according to an embodiment of the present invention may further include a heat exchanger 300 for transferring heat of gas combustion into the heat exchange pipe 100 for heating water flow in the heat exchange pipe 100.

The water heater according to the third aspect embodiment of the utility model comprises the heat exchange assembly 1000 according to the second aspect embodiment of the utility model.

Other components of a water heater according to embodiments of the present invention, such as the housing and power cord, etc., and operation are known to those of ordinary skill in the art and will not be described in detail herein.

According to the water heater provided by the embodiment of the utility model, the heat exchange assembly 1000 of the embodiment of the second aspect is arranged, so that the overall performance of the water heater is improved.

A heat exchange assembly 1000 according to one embodiment of the present invention will be described with reference to fig. 1-7.

Referring to fig. 1, a heat exchange assembly 1000 according to an embodiment of the present invention may include: a heat exchange tube 100 and a tube turbulator structure 200 according to an embodiment of the first aspect of the present invention, the tube turbulator structure 200 being provided inside the heat exchange tube 100.

The inner surface of the heat exchange tube 100 is formed with a convex rib extending along a spiral line in the length direction of the heat exchange tube 100.

The duct spoiler structure 200 may include a spoiler 210 and a spoiler 220, the spoiler 210 being a sheet, the spoiler 210 extending in a length direction along a spiral line, the spoiler 210 being formed with a plurality of serrations 211 at both side edges of a width direction, the serrations 211 protruding toward an inner wall of the duct, the plurality of serrations 211 being arranged at intervals in the length direction of the spoiler 210.

The shape of the saw teeth 211 is formed in a rectangular shape, the height of the saw teeth 211 is 2mm, the width of the saw teeth 211 is 2mm, the interval between two adjacent saw teeth 211 is 2mm, and the twist ratio of the spoiler 210 is 5.

The spoiler 220 is a spring.

Specifically, as shown in fig. 2, the spoiler 220 is disposed in the heat exchange tube 100, the spoiler 220 is connected with the spoiler 210 and the inner wall of the heat exchange tube 100 by welding, the spoiler 210 is disposed in the heat exchange tube 100, when water flows through the spoiler 210, rotational flow is generated, so that water flows at different positions are mixed, occurrence of local high temperature is avoided, and meanwhile, due to the existence of the sawtooth 211 and the spoiler 220, bubbles formed on the inner wall of the heat exchange tube 100 can be further destroyed, generation of large bubbles is inhibited, vaporization noise is reduced, and dry burning cracking of the heat exchange tube 100 is avoided.

According to the pipe spoiler structure 200 of the present invention, the spoiler 210 extending along the spiral line is disposed in the length direction of the spoiler 210, so that the water passing through the spoiler 210 generates a rotational flow, and the high temperature water on the fire-facing surface and the low temperature water at other positions are fully disturbed and mixed, thereby reducing the local high temperature and slowing down the vaporization degree, and the serration 211 is disposed at one side of the width direction of the spoiler 210 facing the inner wall of the pipe, so as to destroy the boundary layer of the inner wall surface of the heat exchange pipe 100, puncture a part of the vapor bubbles, inhibit the generation of the large vapor bubbles, reduce the vaporization noise, and avoid the risk of the heat exchange pipe 100 from being dried and cracked.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings.

The features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise specifically defined and limited, the terms "connected" and "fixed" and the like are to be construed broadly, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A piping turbulator structure, comprising:

the spoiler, the spoiler is the slice, the spoiler extends along the helix in length direction, the spoiler is formed with a plurality of sawtooth at least one side border of width direction, the sawtooth is protruding towards the inner wall of pipeline, and is a plurality of the sawtooth is in interval arrangement in length direction of spoiler.

2. The duct spoiler structure according to claim 1, wherein a width direction of the spoiler at any position is perpendicular to a center line of the spoiler spiral extension.

3. The duct spoiler structure according to claim 1, wherein a plurality of inwardly recessed grooves are formed at both side edges of the spoiler in a width direction thereof, and the serrations are formed between adjacent two of the grooves.

4. The duct spoiler structure according to claim 1, wherein the serrations are rectangular, trapezoidal, triangular, or arcuate in shape.

5. The conduit flow perturbation structure of claim 1 wherein the height of the serrations is 0.1mm-3mm, the width of the serrations is 0.1mm-3mm, and/or the spacing between two adjacent serrations is 1mm-3 mm.

6. The duct spoiler structure according to claim 1, wherein a twist ratio of the spoiler is 1 to 10.

7. The pipe spoiler structure according to claim 1, wherein a spoiler portion is formed on the spoiler, the spoiler portion protruding from a spoiler protrusion, a spoiler rib and/or a spoiler flange on the surface of the spoiler, and/or the spoiler portion is a spoiler hole penetrating through the spoiler in the thickness direction.

8. The duct spoiler structure according to claim 1, further comprising: the spoiler is in a spiral coil shape and sleeved with the spoiler, and the spoiler is fixed on the spoiler.

9. A heat exchange assembly, comprising: the heat exchange tube and the tube turbulent flow structure as set forth in any one of claims 1 to 8, wherein the tube turbulent flow structure is arranged in the heat exchange tube, and the free ends of the saw teeth extend to the inner wall of the heat exchange tube.

10. A heat exchange assembly as claimed in claim 9, wherein the inner surface of the heat exchange tube is formed with a raised rib extending in a helical line along the length of the heat exchange tube.

11. A water heater comprising the heat exchange assembly of claim 9 or 10.

Images