Turbulence generator, heat exchanger and water heater

Abstract

The utility model discloses a turbulent flow generator, heat exchanger and water heater relates to heat exchange equipment technical field, wherein turbulent flow generator includes turbulent flow plate and set up first deflector and second deflector on the turbulent flow plate, second end of second deflector and second end of first deflector incline the direction opposite. According to the technical scheme, the turbulence body is arranged to be in a plate shape, and the first flow deflector and the second flow deflector which are inclined and opposite in orientation are arranged on the plate-shaped turbulence body. Therefore, according to the technical scheme, longitudinal vortexes can be formed in the heat exchange tube, so that core fluid in the tube and boundary layer fluid near the tube wall are disturbed, a thermal boundary layer in the tube is thinned, thermal fluid on the tube wall and cold fluid in a middle core area can be fully mixed, the temperature gradient is reduced, the heat transfer performance of the heat exchange tube is enhanced, and the service life of the heat exchange tube is prolonged. The heat exchange efficiency of the heat exchange tube is improved, the growth of bubbles is inhibited, and gasification noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, and particularly relates to a turbulence generator, a heat exchanger and a water heater. Background Art

[0002] In the related prior art, a turbulence generator or the like is usually arranged in a heat exchange tube to improve the heat exchange efficiency. However, the existing turbulence generators have complex structures, high manufacturing and installation costs. At the same time, due to unreasonable designs, the heat exchange efficiency in actual use is low. In addition, the complex structures not only increase the production difficulty and cost, but also may cause an increase in fluid resistance, further affecting the heat exchange effect. Meanwhile, due to unreasonable designs, the effect of reducing gasification noise in actual use is limited. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a turbulence generator, a heat exchanger and a water heater, aiming to improve the heat exchange efficiency of the heat exchange tube and reduce the gasification noise.

[0004] To achieve the above object, the turbulence generator proposed by the utility model includes:

[0005] A turbulence plate extending along the length direction of the heat exchange tube;

[0006] A first guide vane arranged on the turbulence plate and extending along the fluid direction in the heat exchange tube; the first guide vane has opposite ends, the first end of the first guide vane is connected to the turbulence plate, and the second end of the first guide vane inclines away from the turbulence plate; and

[0007] A second guide vane arranged on the turbulence plate and extending along the fluid direction in the heat exchange tube, the second guide vane has opposite ends, the first end of the second guide vane is connected to the turbulence plate, and the second end of the second guide vane inclines away from the turbulence plate;

[0008] The inclination direction of the second end of the second guide vane is opposite to that of the second end of the first guide vane.

[0009] In one embodiment, the number of the first guide vanes is multiple, and the multiple first guide vanes are arranged at intervals along the length direction of the turbulence plate;

[0010] The number of the second guide vanes is multiple, and the multiple second guide vanes are arranged at intervals along the length direction of the turbulence plate.

[0011] In one embodiment, in the length direction of the turbulence plate, the first guide vane and the second guide vane are arranged in a staggered manner.

[0012] In one embodiment, the turbulator has opposite first and second sides;

[0013] On at least one of both the first side and the second side, the first flow guiding fins are provided, and on at least one of both the first side and the second side, the second flow guiding fins are provided.

[0014] In one embodiment, both the first side and the second side are provided with the first flow guiding fins and the second flow guiding fins;

[0015] The first flow guiding fins provided on the first side and the first flow guiding fins provided on the second side are alternately and spacedly distributed along the length direction of the turbulator;

[0016] And / or, the second flow guiding fins provided on the first side and the second flow guiding fins provided on the second side are alternately and spacedly distributed along the length direction of the turbulator;

[0017] And / or, the first flow guiding fins and the second flow guiding fins provided on the first side are alternately and spacedly distributed along the length direction of the turbulator;

[0018] And / or, the first flow guiding fins and the second flow guiding fins provided on the second side are alternately and spacedly distributed along the length direction of the turbulator.

[0019] In one embodiment, the turbulator is provided with a plurality of through openings, the through openings have opposite ends, at least one of the first flow guiding fins is provided at one end of the through opening, and at least one of the second flow guiding fins is provided at the other end.

[0020] In one embodiment, the number of the through openings is a plurality, and the plurality of through openings are spacedly distributed along the length direction of the turbulator;

[0021] Define the distance between two adjacent through openings as x, and x satisfies: x≧4.0mm.

[0022] In one embodiment, define the angle between the first flow guiding fin and the turbulator as α1, then it satisfies: 30°<α1<80°;

[0023] And / or, define the angle between the second flow guiding fin and the turbulator as α2, then it satisfies: 30°<α2<80°.

[0024] In one embodiment, the turbulator is provided with two bending portions, and the two bending portions extend along the length direction of the heat exchange tube; in the width direction of the turbulator, the first flow guiding fins and the second flow guiding fins are provided between the two bending portions.

[0025] The present utility model further provides a heat exchanger, which includes a heat exchange tube and the turbulator as described in any one of the foregoing embodiments, and is disposed inside the heat exchange tube.

[0026] The present utility model also provides a water heater, which includes the heat exchanger described in any of the foregoing embodiments.

[0027] In the technical solution of the present utility model, the main body of the turbulent flow is set to be plate-shaped, and the first guide vane and the second guide vane which are inclined and have opposite orientations are arranged on the plate-shaped main body of the turbulent flow. In this way, when the fluid flows through the heat exchange tube equipped with the turbulent flow generator provided by the present utility model, longitudinal vortices can be formed at the first guide vane and the second guide vane, thereby disturbing the core fluid in the tube and the boundary layer fluid near the tube wall, thinning the thermal boundary layer in the tube, enabling the hot fluid at the tube wall and the cold fluid in the middle core region to be fully mixed, reducing the temperature gradient, and further enhancing the heat transfer performance of the heat exchange tube and improving the heat exchange efficiency of the heat exchange tube.

[0028] In addition, since the research and development background of the present utility model is for gas water heaters, when heat exchange occurs in the heat exchange tube, bubbles are generated and grow in the high-temperature thermal boundary layer of the heat exchange tube wall. The technical solution of the present utility model, through the arrangement of the first guide vane and the second guide vane, can form a high-speed fluid in the tube. Under the scouring action of the high-speed fluid, the bubbles can quickly detach from the heat exchange tube wall, inhibiting the growth of bubbles and reducing the gasification noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0030] Figure 1 Structural schematic diagram of the first embodiment of the turbulent flow generator provided by the present utility model;

[0031] Figure 2 Structural schematic diagram of the second embodiment of the turbulent flow generator provided by the present utility model;

[0032] Figure 3 For Figure 2 side view;

[0033] Figure 4 Structural schematic diagram of the third embodiment of the turbulent flow generator provided by the present utility model;

[0034] Figure 5 For Figure 4 side view;

[0035] Figure 6 For Figure 5 partial enlarged view;

[0036] Figure 7 Structural schematic diagram of the fourth embodiment of the turbulence generator provided by the present utility model;

[0037] Figure 8 is Figure 7 side view of;

[0038] Figure 9 Structural schematic diagram of an embodiment of the heat exchanger provided by the present utility model;

[0039] Figure 10 Surface temperature distribution diagrams of a smooth heat exchange tube and a heat exchange tube applying the turbulence generator of the four foregoing embodiments of the present utility model;

[0040] Figure 11 Surface pressure distribution diagrams of a smooth heat exchange tube and a heat exchange tube applying the turbulence generator of the four foregoing embodiments of the present utility model;

[0041] Figure 12 Comparison diagram of the convective heat transfer coefficient and pressure drop inside the tubes of a smooth heat exchange tube and a heat exchange tube applying the turbulence generator of the four foregoing embodiments of the present utility model.

[0042] Explanation of the reference numerals in the drawings:

[0043] 1. Heat exchanger;

[0044] 10. Turbulence generator; 100. Turbulence plate; 101. Through port; 200. First guide vane; 300. Second guide vane;

[0045] 20. Heat exchange tube;

[0046] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0047] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0048] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0049] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0050] The present utility model provides a turbulence generator, which is applied inside a heat exchange tube and aims to improve the heat exchange efficiency of the heat exchange tube. For the convenience of understanding and description, in the attached Figures 1 to 9 drawings of the present utility model, the openings are indicated by solid arrows.

[0051] Please refer to Figures 1 to 9 , in an embodiment of the present utility model, the turbulence generator 10 includes a turbulence plate 100, a first guide vane 200, and a second guide vane 300. The turbulence plate 100 extends along the length direction of the heat exchange tube 20; the first guide vane 200 is arranged on the turbulence plate 100 and extends along the fluid direction inside the heat exchange tube 20; the first guide vane 200 has opposite ends, the first end of the first guide vane 200 is connected to the turbulence plate 100, and the second end of the first guide vane 200 is inclined away from the turbulence plate 100; the second guide vane 300 is arranged on the turbulence plate 100 and extends along the fluid direction inside the heat exchange tube 20, the second guide vane 300 has opposite ends, the first end of the second guide vane 300 is connected to the turbulence plate 100, and the second end of the second guide vane 300 is inclined away from the turbulence plate 100; the inclination direction of the second end of the second guide vane 300 is opposite to the inclination direction of the second end of the first guide vane 200.

[0052] Regarding the turbulence plate 100, the turbulence plate 100 is adapted to the shape of the heat exchange tube 20. The heat exchange tube 20 is usually oblong or long oval. Therefore, the turbulence plate 100 is usually arranged in a long strip shape. The turbulence plate 100 has two opposite plate surfaces, and a flow-through channel is formed between the plate surfaces and the tube wall of the heat exchange tube 20.

[0053] The turbulator plate 100 is provided with a first flow guiding vane 200. The first flow guiding vane 200 has a first end and a second end which are oppositely arranged along its length direction. Among them, the first end of the first flow guiding vane 200 is connected to the turbulator plate 100, and the second end of the first flow guiding vane 200 inclines away from the turbulator plate 100. That is, when the turbulator 10 is installed on the heat exchange tube 20, the second end of the first flow guiding vane 200 inclines towards the tube wall of the heat exchange tube 20. In some embodiments, it can be understood that the first end of the first flow guiding vane 200 is the connecting end and the second end is the free end. In this way, the first flow guiding vane 200 can guide the fluid flowing through the first flow guiding vane 200 to the tube wall of the heat exchange tube 20, thereby disturbing the fluid at the tube wall of the heat exchange tube 20, and thus thinning the boundary layer at the tube wall.

[0054] The turbulator plate 100 is provided with a second flow guiding vane 300. The second flow guiding vane 300 also has a first end and a second end which are oppositely arranged along its length direction. Among them, the first end of the second flow guiding vane 300 is connected to the turbulator plate 100, and the second end of the second flow guiding vane 300 inclines away from the turbulator plate 100. That is, when the turbulator 10 is installed on the heat exchange tube 20, the second end of the second flow guiding vane 300 inclines towards the tube wall of the heat exchange tube 20. It can be understood that the first end of the second flow guiding vane 300 is the connecting end and the second end is the free end. In this way, the second flow guiding vane 300 can guide the fluid flowing through the second flow guiding vane 300 to the tube wall of the heat exchange tube 20, thereby disturbing the fluid at the tube wall of the heat exchange tube 20, and thus thinning the boundary layer at the tube wall. In some embodiments.

[0055] Regarding the shape and structure of the first flow guiding vane 200 and the second flow guiding vane 300, the shape and structure of the first flow guiding vane 200 and the second flow guiding vane 300 can be the same or different. The shapes of the first flow guiding vane 200 and the second flow guiding vane 300 can be regular shapes such as square sheets or oval sheets, or other irregular shapes. Preferably, the first flow guiding vane 200 and the second flow guiding vane 300 are arranged as rectangular sheets.

[0056] Further, please refer to Figures 4 to 6 , the inclination direction of the second end of the second flow guiding vane 300 is opposite to the inclination direction of the second end of the first flow guiding vane 200. It should be understood that the inclination directions of the second flow guiding vane 300 and the first flow guiding vane 200 are opposite. If one inclines to the left, the other inclines to the right. Or if the upper end of one object inclines to the left, the upper end of the other object inclines to the right. However, the inclination angles are not necessarily equal. For example, Figure 6For example, the first flow deflector 200 inclines to the right, and the included angle ɑ1 between the first flow deflector 200 and the turbulence plate 100 is 40 degrees; the second flow deflector 300 inclines to the left, and the included angle ɑ2 between the second flow deflector 300 and the turbulence plate 100 is 45 degrees.

[0057] The technical solution of the present utility model sets the turbulence main body as a plate shape, and arranges the first flow deflector 200 and the second flow deflector 300 with opposite inclination directions on the plate-shaped turbulence main body. In this way, when the fluid flows through the heat exchange tube 20 equipped with the turbulence generator 10 provided by the present utility model, a longitudinal vortex can be formed in the heat exchange tube 20, thereby disturbing the core fluid in the tube and the boundary layer fluid near the tube wall, thinning the thermal boundary layer in the tube, enabling the hot fluid at the tube wall and the cold fluid in the middle core region to be fully mixed, reducing the temperature gradient, and further strengthening the heat transfer performance of the heat exchange tube 20 and improving the heat exchange efficiency of the heat exchange tube 20.

[0058] In addition, since the R & D background of the present utility model is for gas water heaters, when heat exchange occurs in the heat exchange tube, bubbles are generated and grow in the high-temperature thermal boundary layer of the heat exchange tube wall. The technical solution of the present utility model, through the arrangement of the first flow deflector and the second flow deflector, can form a high-speed fluid in the tube. Under the scouring action of the high-speed fluid, it can quickly break away from the heat exchange tube wall, inhibit the growth of bubbles, and reduce the gasification noise.

[0059] It should be noted that the included angles between the first flow deflector 200 and the second flow deflector 300 and the turbulence plate 100 directly affect the heat exchange effect of the heat exchange tube 20 and the resistance received by the fluid. If the first flow deflector 200 and the second flow deflector 300 cannot direct enough flow to the tube wall of the heat exchange tube 20, the effect of strengthening heat transfer is poor; and since the larger the included angles between the first flow deflector 200 and the second flow deflector 300 and the turbulence plate 100, the greater the resistance to the fluid, so when the included angles between the first flow deflector 200 and the second flow deflector 300 and the turbulence plate 100 are too large, the resistance of the fluid will be large.

[0060] In this embodiment, since the first flow deflector 200 and the second flow deflector 300 are arranged in a staggered manner up and down and front and back, and the flow guiding areas of the first flow deflector 200 and the second flow deflector 300 are small. Therefore, by controlling the included angle between the first flow deflector 200 and the turbulence plate 100 to be between 30° and 80°, and controlling the included angle between the second flow deflector 300 and the turbulence plate 100 to be between 30° and 80°, the resistance of the fluid can be reduced while ensuring the heat transfer strengthening effect.

[0061] In an exemplary embodiment, taking Figure 6For example, define the included angle between the first deflector 200 and the turbulence plate 100 as α1, then it satisfies: 30° < α1 < 80°, and the values of α1 include but are not limited to 31°, 33°, 37°, 39°, 42°, 45°, 50°, 52°, 56°, 60°, 63°, 68°, 70°, 72°, 75° or 79°, etc.

[0062] In another exemplary embodiment, taking Figure 6 as an example, define the included angle between the second deflector 300 and the turbulence plate 100 as α2, then it satisfies: 30° < α2 < 80°, and the values of α2 include but are not limited to 31°, 33°, 37°, 39°, 42°, 45°, 50°, 52°, 56°, 60°, 63°, 68°, 70°, 72°, 75° or 79°, etc.

[0063] Since the heat exchange tube 20 generally has a certain length, thus, in order to make the entire heat exchange tube 20 have a good heat exchange effect, the number of the first deflectors 200 is multiple, and the number of the second deflectors 300 is usually also multiple. The multiple first deflectors 200 are arranged at intervals along the length direction of the turbulence plate 100; the multiple second deflectors 300 are arranged at intervals along the length direction of the turbulence plate 100.

[0064] In one embodiment, the turbulence plate 100 has opposite first and second sides; in at least one of the first side and the second side, the first deflector 200 is provided, and in at least one of them, the second deflector 300 is provided. Among them, place the turbulence generator 10 as Figure 5 shown. The opposite first and second sides that the turbulence plate 100 has can be understood as taking the turbulence plate 100 itself as the dividing surface, the first side is the upper side, and the second side is the lower side.

[0065] In one embodiment, in the length direction of the turbulence plate 100, the first deflector 200 and the second deflector 300 are arranged in a staggered manner. The first deflector 200 and the second deflector 300 being arranged in a staggered manner should be understood as that in the orthographic projection pattern along the length direction of the turbulence plate 100, there are non-overlapping parts between the first deflector 200 and the second deflector 300.

[0066] Based on the previous embodiment, both the first side and the second side are provided with the first deflector 200 and the second deflector 300; the first deflectors 200 provided on the first side and the first deflectors 200 provided on the second side are alternately arranged at intervals along the length direction of the turbulence plate 100.

[0067] Based on any of the above embodiments, the first guide vane 200 and the second guide vane 300 are provided on both the first side and the second side; the second guide vanes 300 provided on the first side and the second guide vanes 300 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100.

[0068] In a preferred embodiment, please refer to Figures 4 to 6 , the first guide vane 200 and the second guide vane 300 are provided on both the first side and the second side; the first guide vanes 200 provided on the first side and the first guide vanes 200 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100; and, the second guide vanes 300 provided on the first side and the second guide vanes 300 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100. Thus, in this embodiment, the first guide vanes 200 and the second guide vanes 300 arranged in a staggered manner up and down can effectively guide the hot fluid on the wall surface of the heat exchange tube 20 to the cold fluid behind, so that the hot and cold fluids are mixed in the flow space, thereby enhancing the heat transfer performance of the heat exchange tube 20.

[0069] In an embodiment, the turbulence plate 100 has opposite first and second sides; among both the first side and the second side, at least one side is provided with the first guide vane 200, and at least one side is provided with the second guide vane 300. Among them, place the turbulence generator 10 as Figure 5 shown. The opposite first and second sides of the turbulence plate 100 can be understood as taking the turbulence plate 100 itself as the interface, the first side is the upper side, the second side is the lower side. In addition, the front of the turbulence plate 100 is close to the water inlet end, and the rear of the turbulence plate 100 is close to the water outlet end. In some embodiments, it can be understood as Figure 5 shown, the left side is the front and the right side is the rear.

[0070] Based on the above embodiment, the first guide vane 200 and the second guide vane 300 are provided on both the first side and the second side; the first guide vanes 200 and the second guide vanes 300 provided on the first side are alternately and spaced apart along the length direction of the turbulence plate 100.

[0071] Alternatively, based on the above embodiment, the first guide vane 200 and the second guide vane 300 are provided on both the first side and the second side; the first guide vanes 200 and the second guide vanes 300 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100.

[0072] Exemplarily, the first side and the second side are both provided with the first flow guiding fins 200 and the second flow guiding fins 300; the first flow guiding fins 200 and the second flow guiding fins 300 provided on the first side are alternately and spaced apart along the length direction of the turbulence plate 100; the first flow guiding fins 200 and the second flow guiding fins 300 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100. Thus, in this embodiment, the first flow guiding fins 200 and the second flow guiding fins 300 arranged alternately in the front and back can continuously reverse the hot fluid near the front part of the heat exchange tube 20 to the central cold fluid area of the rear part of the heat exchange tube 20, making the mixing of the front and rear parts more uniform and the heat transfer of the heat exchange tube 20 more uniform.

[0073] Based on any of the foregoing embodiments, please refer to Figure 1 , Figure 2 and Figure 9 , in an exemplary embodiment, the first side and the second side are both provided with the first flow guiding fins 200 and the second flow guiding fins 300. The first flow guiding fins 200 provided on the first side and the first flow guiding fins 200 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100. The second flow guiding fins 300 provided on the first side and the second flow guiding fins 300 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100. The first flow guiding fins 200 and the second flow guiding fins 300 provided on the first side are alternately and spaced apart along the length direction of the turbulence plate 100. The first flow guiding fins 200 and the second flow guiding fins 300 provided on the second side are alternately and spaced apart along the length direction of the turbulence plate 100.

[0074] Thus, first of all, the first flow guiding fins 200 and the second flow guiding fins 300 themselves can guide the fluid to the tube wall of the heat exchange tube 20, promoting the mixing of the hot fluid near the tube wall of the heat exchange tube 20 and the central cold fluid of the heat exchange tube 20, thereby strengthening heat transfer; secondly, the arrangement of the first flow guiding fins 200 and the second flow guiding fins 300 increases the flow time of the fluid in the heat exchange tube 20, further strengthening heat transfer; in addition, the first flow guiding fins 200 and the second flow guiding fins 300 are arranged in opposite directions, so that the flow in the heat exchange tube 20 can continuously reverse the hot fluid near the front part of the heat exchange tube 20 to the central cold fluid area of the rear part of the heat exchange tube 20, making the mixing of the front and rear parts more uniform and the heat transfer of the heat exchange tube 20 more uniform, preventing local overheating of the heat exchange tube 20 and causing subcooled boiling and vaporization phenomena, which affect the heat exchange efficiency, and thus further strengthening heat transfer.

[0075] Based on the above embodiments, the turbulence plate 100 is provided with a plurality of through holes 101. The through holes 101 have opposite ends. At least one of the first guide vanes 200 is provided at one end of the through hole 101, and at least one of the second guide vanes 300 is provided at the other end. With such a setting, the fluid on the first side and the fluid on the second side can flow between each other, which can expand the formation of longitudinal vortices between the first guide vane 200 and the second guide vane 300, further promoting the mixing of the hot fluid on the pipe wall and the cold fluid in the center, making the temperature more uniform.

[0076] Among them, the opposite ends correspond to the two ends of the turbulence plate 100. The front of the turbulence plate 100 is close to the water inlet end, and the rear of the turbulence plate 100 is close to the water outlet end. In some embodiments, it can be understood that Figure 5 As shown, the left side is the front and the right side is the rear. The through hole 101 can be a rectangular hole or other polygonal holes. Preferably, the through hole 101 is a rectangular hole, and the rectangular hole is convenient for processing and reduces the difficulty of the production process. It should be noted that the rectangular hole includes a rectangular opening and a square opening.

[0077] In one embodiment, the number of the through holes 101 is multiple, and the multiple through holes 101 are spaced apart along the length direction of the turbulence plate 100. It should be noted that since the first guide vane 200 and the second guide vane 300 are arranged at the edges of the through hole 101, when the distance between two adjacent through holes 101 is too small, the number of the first guide vane 200 and the second guide vane 300 will be too large, resulting in an increase in the resistance to the fluid.

[0078] Based on this, define the distance between two adjacent through holes 101 as x, and x satisfies: x≧4.0mm. Specifically, it can be 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm or more than 8.0mm.

[0079] It can be understood that if the distance between two adjacent through holes 101 is too large, the number of the first guide vane 200 and the second guide vane 300 will be too small, and not enough flow can be guided to the pipe wall of the heat exchange tube 20, resulting in a poor effect of enhanced heat transfer. However, this also needs to be determined in combination with the diameter of the heat exchange tube 20 and will not be limited here.

[0080] In this embodiment, in a manufacturing embodiment of the turbulence generator 10, a long strip-shaped substrate is used to stamp out the shapes of the first guide vane 200, the second guide vane 300 and the through hole 101. Then, the first guide vane 200 and the second guide vane 300 are pushed according to their corresponding angles and tilting orientations. This design has a simple structure, a simple processing process and strong practicability.

[0081] To prove the superiority of the present utility model, four solutions of selecting the light tube of the prior art and applying the technical concept of the present utility model are taken as cases for numerical simulation. Among them, the boundary conditions of the simulation cases are the same and the overall dimensions are the same.

[0082] Ansys Fluent is used to perform numerical calculations on the flow and heat transfer performance of the space-interleaved sine-wave vane type vortex generator turbulator and its deformed structure and the corresponding smooth heat exchange tube 20. The calculation conditions are as follows: the fluid is water, the inlet mass flow rate is 0.7 kg / s, the inlet temperature is 20 °C, the outlet pressure is 0, and the convective heat transfer coefficient of the wall is 1500 kW / m2˙K; the steady state and the Realizable k-ε model are adopted, and the SIMPLE algorithm is used for pressure and velocity. For the momentum and energy equations, the diffusion term adopts the central difference format, and the convection term adopts the second-order upwind difference format. When the residuals of the continuity equation, momentum equation, and energy equation are all less than 10 -6 , it is considered that the numerical calculation converges, and the numerical simulation results are as Figures 10 to 12 shown.

[0083] Figure 10 is the surface temperature distribution diagram of the smooth heat exchange tube and the heat exchange tubes applying the turbulators of the four foregoing embodiments of the present utility model; Figure 11 is the surface pressure distribution diagram of the smooth heat exchange tube and the heat exchange tubes applying the turbulators of the four foregoing embodiments of the present utility model; Figure 12 is the comparison diagram of the convective heat transfer coefficient and pressure drop inside the tubes of the smooth heat exchange tube and the heat exchange tubes applying the turbulators of the four foregoing embodiments of the present utility model.

[0084] In Figures 10 to 12 , (a) corresponds to the smooth heat exchange tube, (b) corresponds to the first embodiment ( Figure 1 shown), (c) corresponds to the second embodiment ( Figure 2 shown), (d) corresponds to the third embodiment ( Figure 4 shown), and (e) corresponds to the fourth embodiment ( Figure 7 shown).

[0085] The above numerical simulation results show that compared with the smooth heat exchange tube 20, the four solutions applying the technical concept of the present utility model as cases can effectively reduce the surface temperature of the heat exchange tube 20 and strengthen the heat transfer inside the tube. From Figure 10 the surface temperature distribution of the heat exchange tube 20; Figure 1 and Figure 2 the surface temperature of the heat exchange tubes in the shown embodiments is lower, indicating that these two structures have a stronger improvement on the heat transfer performance inside the heat exchange tube 20. However, from Figure 11 the surface pressure distribution of the heat exchange tube 20 shown and Figure 12 the comparison of the convective heat transfer coefficient and pressure drop, Figure 1The pressure drop of the shown implementation is smaller than that of Figure 2 the pressure drop of the shown embodiment. Considering temperature and pressure comprehensively, Figure 1 the comprehensive heat transfer enhancement performance of the shown implementation is stronger. Figure 4 and Figure 9 the shown embodiments are based on Figure 1 the shown implementation and have local improvements. Figure 4 and Figure 9 the comprehensive heat transfer enhancement performance of the shown embodiments is basically close to that of Figure 1 the shown implementation.

[0086] In one embodiment, the turbulator plate 100 is provided with two bent portions, and the two bent portions extend along the length direction of the heat exchange tube 20; in the width direction of the turbulator plate 100, the first guide vane 200 and the second guide vane 300 are arranged between the two bent portions.

[0087] In this way, the setting of the bent portions can facilitate the insertion of the turbulator 10 into the heat exchange tube 20, and avoid the cutting surface of the turbulator plate 100 from fitting with the tube wall of the heat exchange tube 20. The cutting surface of the turbulator plate 100 may have a relatively large roughness compared to its plate surface, and the direct contact between the turbulator plate 100 and the tube wall may introduce thermal stress, resulting in mechanical stress concentration. In addition, when the turbulator plate 100 and the heat exchange tube 20 are connected by welding, the setting of the bent portions can increase the connection area (such as the welding area) between the turbulator plate 100 and the tube wall of the heat exchange tube 20, that is, the turbulator plate 100 can be better fixed to the tube wall of the heat exchange tube 20 through the bent portions. Of course, the bent portions cannot be too large, otherwise it will affect the heat transfer of the heat exchange tube 20.

[0088] The present utility model also proposes a heat exchanger 1, which includes a heat exchange tube 20 and a turbulator 10. The specific structure of the turbulator 10 refers to the above embodiments. Since this heat exchanger 1 adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0089] In this embodiment, the heat exchanger 1 may have one heat exchange tube 20 or multiple heat exchange tubes 20. The multiple heat exchange tubes 20 can be arranged in parallel or in series, and at least one heat exchange tube 20 is provided with a turbulator 10. Preferably, all the heat exchange tubes 20 are provided with turbulators 10.

[0090] In one embodiment, the turbulator 10 can be fixedly connected to the tube wall of the heat exchange tube 20 by welding. In other embodiments, the turbulator 10 is also connected to the tube wall of the heat exchange tube 20 by interference fit.

[0091] The present utility model further provides a water heater, which includes a heat exchanger 1. The specific structure of the heat exchanger 1 refers to the above-mentioned embodiments. Since this water heater adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here.

[0092] In this embodiment, the water heater is usually a gas water heater. The water heater may further include a housing, an inner shell, a burner and a heat exchanger 1. The burner and the heat exchanger 1 are arranged inside the inner shell and form a combustion chamber. The inner shell is arranged inside the housing. The burner is used to burn gas to generate high-temperature flue gas in the combustion chamber. The high-temperature flue gas flows to the heat exchanger 1 and exchanges heat with the water in the heat exchange tube 20 of the heat exchanger 1 to heat the water flowing through the heat exchange tube 20.

[0093] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A turbulence generator for installation inside a heat exchange tube, characterized in that, The turbulence generator includes: a turbulence plate extending along the length direction of the heat exchange tube; a first flow guiding fin disposed on the turbulence plate and extending along the fluid direction in the heat exchange tube; the first flow guiding fin has opposite two ends, the first end of the first flow guiding fin is connected to the turbulence plate, and the second end of the first flow guiding fin inclines away from the turbulence plate; and a second flow guiding fin disposed on the turbulence plate and extending along the fluid direction in the heat exchange tube, the second flow guiding fin has opposite two ends, the first end of the second flow guiding fin is connected to the turbulence plate, and the second end of the second flow guiding fin inclines away from the turbulence plate; the inclination direction of the second flow guiding fin is opposite to that of the first flow guiding fin.

2. The turbulence generator according to claim 1, characterized in that, The number of the first flow guiding fins is multiple, and the multiple first flow guiding fins are arranged at intervals along the length direction of the turbulence plate; The number of the second flow guiding fins is multiple, and the multiple second flow guiding fins are arranged at intervals along the length direction of the turbulence plate.

3. The turbulence generator according to claim 2, characterized in that, In the length direction of the turbulence plate, the first flow guiding fin and the second flow guiding fin are arranged in a staggered manner.

4. The turbulator according to claim 2, wherein The turbulence plate has opposite first side and second side; Among the first side and the second side, at least one of them is provided with the first flow guiding fin, and at least one of them is provided with the second flow guiding fin.

5. The turbulator according to claim 4, characterized in that, Both the first side and the second side are provided with the first flow guiding fin and the second flow guiding fin; The first flow guiding fins disposed on the first side and the first flow guiding fins disposed on the second side are alternately arranged at intervals along the length direction of the turbulence plate; and / or, the second flow guiding fins disposed on the first side and the second flow guiding fins disposed on the second side are alternately arranged at intervals along the length direction of the turbulence plate; and / or, the first flow guiding fins and the second flow guiding fins disposed on the first side are alternately arranged at intervals along the length direction of the turbulence plate; and / or, the first flow guiding fins and the second flow guiding fins disposed on the second side are alternately arranged at intervals along the length direction of the turbulence plate.

6. The turbulator according to claim 2, characterized in that, The turbulence plate is provided with multiple through holes, each through hole has opposite two ends, at least one of the first flow guiding fins is disposed at one end of the through hole, and at least one of the second flow guiding fins is disposed at the other end of the through hole.

7. The turbulence generator according to claim 6, wherein The number of the through holes is multiple, and the multiple through holes are arranged at intervals along the length direction of the turbulence plate; Define the distance between two adjacent through holes as x, and x satisfies: x≧4.0mm.

8. The turbulence generator according to any one of claims 1 to 7, characterized in that, Define the angle between the first deflector and the turbulence plate as α1, and it satisfies: 30° < α1 < 80 ° ; And / or, define the included angle between the second flow guide vane and the turbulence plate as α2, then it satisfies: 30° < α2 < 80 ° .

9. The turbulator according to claim 8, wherein The turbulence plate is provided with two bending portions extending along the length direction of the heat exchange tube; In the width direction of the turbulence plate, the first flow guiding fin and the second flow guiding fin are disposed between the two bending portions.

10. A heat exchanger, characterized in that, including: a heat exchange tube; the turbulence generator according to any one of claims 1 to 9, disposed in the heat exchange tube.

11. A water heater, characterized in that, including the heat exchanger according to claim 10.

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