CN114440665A

CN114440665A - Heat exchanger and gas heating water heater

Info

Publication number: CN114440665A
Application number: CN202210002849.7A
Authority: CN
Inventors: 陈永钊; 陶龙礼; 熊磊明
Original assignee: Guangzhou Devotion Home Environment Technology Co ltd
Current assignee: Guangzhou Devotion Home Environment Technology Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-05-06

Abstract

The embodiment of the invention relates to the technical field of heat exchangers, in particular to a heat exchanger and a gas heating water heater. The heat exchanger includes a heat exchanger body, a first connection box, and a second connection box. The heat exchanger main body comprises a plurality of heat exchange tubes and fins; each heat exchange tube is a first heat exchange group, a second heat exchange group and a third heat exchange group which are arranged in parallel, and the third heat exchange group is arranged between the first heat exchange group and the second heat exchange group; the first connecting box is sleeved at one end of the heat exchanger main body; the first connecting box is provided with a water inlet cavity and a first communicating cavity, and the water inlet cavity is communicated with the first heat exchange group; the first communicating cavity is communicated with the second heat exchange group and the third heat exchange group; the second connecting box is sleeved at the other end of the heat exchanger main body; the second connecting box is provided with a water outlet cavity and a second communicating cavity, and the water outlet cavity is communicated with the second heat exchange group; the second communicating cavity is communicated with the first heat exchange group and the third heat exchange group. The heat exchanger reduces the resistance of the pipeline through the design of the parallel pipelines and improves the heat exchange efficiency.

Description

Heat exchanger and gas heating water heater

Technical Field

The embodiment of the invention relates to the technical field of heat exchange equipment, in particular to a heat exchanger and a gas heating water heater.

Background

Heat exchangers, also known as heat exchangers, are an industrial application of heat convection, heat radiation and heat conduction, where the heat is transferred from a high temperature fluid to a low temperature fluid to meet specified process requirements. The gas heating water heater takes natural gas as fuel, the natural gas generates high-temperature flue gas after being combusted by a combustor, the high-temperature flue gas flows through a heat exchanger, heat energy of the high-temperature flue gas is transferred to low-temperature system circulating water through the heat exchanger for heat exchange, then a fan discharges the low-temperature flue gas after the heat exchange outdoors, the system water flows in a circulating mode through a circulating pump, and the heat absorbed by the system water from the heat exchanger is taken away in time. The common finned heat exchanger in the gas heating water heater is used as a heat exchanger, the finned heat exchanger is a heat exchanger for exchanging heat between gas and liquid, the purpose of enhancing heat transfer is achieved by additionally arranging fins on a common base pipe, the heat exchange process mainly comprises convection heat exchange and radiation heat exchange, so that the heat exchange area of high-temperature flue gas and a main heat exchanger is increased, the heat exchange efficiency is increased, and heat is transferred to system water in a pipeline.

Heat exchange tubes used by the existing heat exchanger are generally of a single-tube series connection structure, the heat exchange tubes of the single-tube series connection structure need to be connected by welding U-shaped tubes at two ends of a straight tube, the structure process is complex and high in processing cost, the resistance of a pipeline tortuous system is large, larger circulating pump power is needed to overcome the resistance generated by the pipeline, high-temperature water after heat exchange is easy to generate a large throttling effect in the high-temperature water, heat is lost, and the heat exchange efficiency is reduced. In addition, the structure has higher requirements on the size precision of the U-shaped pipe interface, so the structure has higher requirements on the pipe expanding process, and simultaneously, more interfaces need to be welded, so the risk of water leakage at the interfaces is higher, and the reject ratio of a heat exchanger product is high.

Disclosure of Invention

The invention aims to provide a heat exchanger, which aims to reduce the pipeline resistance of the heat exchanger and improve the heat exchange efficiency.

The invention also provides a gas heating water heater adopting the heat exchanger.

The invention adopts a technical scheme that: a heat exchanger is provided that includes a heat exchanger body, a first connection box, and a second connection box. The heat exchanger main body comprises a plurality of heat exchange tubes and fins; each heat exchange tube is a first heat exchange group, a second heat exchange group and a third heat exchange group, wherein the first heat exchange group, the second heat exchange group and the third heat exchange group are arranged side by side and form a first circulation direction, and the third heat exchange group is arranged between the first heat exchange group and the second heat exchange group; the fins are sleeved on the heat exchange tube at intervals along the length direction of the heat exchange tube and separate the heat exchange tube. The first connecting box is sleeved at one end of the heat exchanger main body; the first connecting box is provided with a water inlet cavity and a first communicating cavity, and the water inlet cavity is communicated with the first heat exchange group; the first communicating cavity is communicated with the second heat exchange group and the third heat exchange group. The second connecting box is sleeved at the other end of the heat exchanger main body; the second connecting box is provided with a water outlet cavity and a second communicating cavity, and the water outlet cavity is communicated with the second heat exchange group; the second communicating cavity is communicated with the first heat exchange group and the third heat exchange group.

Optionally, the heat exchange tube is at least one of an elliptical tube, a flat tube and a special-shaped tube.

Optionally, the length of the first communicating cavity is greater than the length of the water inlet cavity or the water outlet cavity, and the length of the second communicating cavity is equal to the length of the first communicating cavity.

Optionally, the fin is provided with a first convex hull, a flanging hole and mounting holes, the first convex hull and the flanging hole flanging are both protruded towards the same side of the fin and are arranged between the adjacent mounting holes, and the flanging hole is positioned above the first convex hull; the mounting hole is used for the heat exchange tube to penetrate through, the mounting hole is provided with a mounting hole flanging which is at the same side as the first convex hull or the flanging hole flanging, and the mounting hole flanging is adjacent to the first convex hull and the flanging hole flanging to form a turbulence structure between the fins.

Optionally, the first convex hull is of a round convex hull structure, the flanging hole is of an inverted triangle structure, and the height of the top end of the flanging hole is higher than that of the top end of the mounting hole.

Optionally, a welding rod hole communicated with the mounting hole is further formed in the fin, and the welding rod hole is arranged in a semicircular shape.

Optionally, the fin is further provided with a long waist hole flanging which is arranged oppositely, and the long waist hole flanging is close to the top of the mounting hole flanging and is arranged in parallel with one side of the flanging hole, which is far away from the long waist hole flanging.

Optionally, the fin is further provided with a first notch, a second notch, a third notch and a fourth notch, the first notch is located above the mounting hole, the second notch is located below the first convex hull, the third notch is located at the lower end of the fin, and the fourth notch is located at the upper end of the fin.

Optionally, the fin is further provided with a sealing flange which is arranged oppositely, the sealing flange is arranged in a strip shape, and the flange width of the sealing flange is larger than that of the flange hole or the flange of the mounting hole.

Compared with the prior art, the heat exchanger provided by the embodiment of the invention has the following beneficial effects:

the heat exchanger provided by the invention changes the traditional single-tube series structure, adopts a heat exchange group formed by connecting multiple tubes in parallel, and the first heat exchange group, the third heat exchange group and the second heat exchange group are connected in series to form a pipeline structure, so that the resistance of the pipeline is reduced, and the heat exchange efficiency of the heat exchanger is improved.

The multi-tube parallel structure of the heat exchanger of the present invention is advantageous to enhance the reliability of the product. When one or more heat exchange tubes are blocked, the whole heat exchange tube group can still work as long as one heat exchange tube of the heat exchange group is in a circulation state, and the whole heat exchanger can still work.

According to the heat exchanger, the first heat exchange group is communicated with the third heat exchange group, and the second heat exchange group is communicated with the third heat exchange group by adopting the connecting box structure, compared with a traditional U-shaped pipe, the connecting box omits a pipe expanding process step of aligning the centers of pipes, the welding mode between the pipes is changed into a pipe-plane welding mode, and a water box-plane welding mode, so that the welding difficulty is reduced, and the reject ratio of products is effectively reduced. Meanwhile, the bending of the pipeline can be reduced, so that the pipeline resistance of the heat exchanger is reduced, and the problems that the existing heat exchanger is large in system resistance, easy to scale and even plugged, so that the system circulation is not good and the noise of the heat exchanger is low are solved.

The heat exchanger provided by the invention has the advantages that the fin structure is optimized, the heat exchange efficiency is improved, the thickness of the fins is not reduced on the premise of ensuring the performance and prolonging the service life, and the heat exchange efficiency of the heat exchanger is improved by optimizing the fin structure.

Drawings

To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly describe the embodiments. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic perspective view of a heat exchanger according to an embodiment of the present invention.

Fig. 2 is an exploded schematic view of the heat exchanger.

Fig. 3 is a schematic plan view of a heat exchanger.

Fig. 4 is a schematic view of the flow of water within the heat exchanger.

Fig. 5 is a perspective view of a fin.

Fig. 6 is a schematic view of the flow of air over the fin surfaces.

Fig. 7 is a cross-sectional view a-a of fig. 6.

Fig. 8 is a sectional view of B-B in fig. 6.

In the figure: 10. a heat exchanger main body; 11. a heat exchange pipe; 12. a fin; 12a, a first convex hull; 12b, flanging holes; 12c, mounting holes; 12d, flanging the long waist hole; 12e, sealing and flanging; 12f, welding rod holes; 12g, a first notch; 12h, a second gap; 12i and a third gap; 12j, a fourth gap; 13. a first heat exchange set; 14. a second heat exchange group; 15. a third heat exchange group;

20. a first junction box; 20a, a water inlet cavity; 20b, a first communicating cavity; 21. a water box top cover; 21a, a large convex hull; 21b, small convex hulls; 22. a water box bottom plate; 22a and heat exchange tube jacks;

30. a second connection box; 30a, a water outlet cavity; 30b, a second communication chamber.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" 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," "inner," "outer," and the like as used herein are for purposes of description only.

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 in the description of the invention herein 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.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, a schematic perspective view, an exploded schematic view, a schematic plan view and a schematic connection manner of the first heat exchange set 13, the second heat exchange set 14, the third heat exchange set 15, the first connection box 20 and the second connection box 30 are respectively shown. The heat exchanger includes a heat exchanger main body 10, a first connection box 20, and a second connection box 30. The individual components of the heat exchanger will be described separately below.

The heat exchanger body 10 includes a plurality of heat exchange tubes 11 and fins 12. The heat is conducted to the heat exchange tube 11 and then transferred to the water in the heat exchange tube 11, thereby realizing the heat exchange process. The fins 12 increase the heat exchange area, and meanwhile, the structure of the heat exchange tube is also utilized, so that the collision chance of high-temperature airflow with the fins 12 and the heat exchange tube 11 is increased, and the heat exchange efficiency is further improved. In this embodiment, each fin 12 is sleeved on the heat exchange tube 11 at intervals along the length direction of the heat exchange tube 11 and separates each heat exchange tube 11, so that the air flow can flow out along the gaps formed between the fins 12 and the heat exchange tube 11 and between the fins and the connecting box, thereby increasing the heat exchange efficiency of the convection heat exchange and the radiation heat exchange.

Referring to fig. 3 and 4, the plurality of heat exchange tubes 11 are arranged side by side and divided into a first heat exchange group 13, a second heat exchange group 14 and a third heat exchange group 15, wherein the third heat exchange group 15 is arranged between the first heat exchange group 13 and the second heat exchange group 14. The grouping is based on the fact that the flow direction of the fluid composing the heat exchange tubes 11 of each heat exchange group is the same, wherein the flow direction of the liquid in the tubes of the first heat exchange group 13 is the same as that of the liquid in the tubes of the second heat exchange group 14, and is defined as a first flow direction; the liquid flow direction in the tubes of the third heat exchange set 15 is defined as the second flow direction. The first and second flow directions completely constitute the direction in which the water flow meanders within the tube. In this embodiment, the first flow direction and the second flow direction are opposite, in other embodiments, the first flow direction and the second flow direction may also be other curved shapes, and this embodiment is not limited herein. It should be mentioned that the heat exchange tube 11 may be an elliptical tube or a flat tube, or a special tube, and compared with a circular tube, the tubes have larger contact area with the hot air flow in the process of upward flowing of the hot air flow under the same flow rate. Taking an elliptical tube as an example, the long axis of the elliptical tube is arranged in the vertical direction, so that the surface of the elliptical tube can be in more sufficient contact with the airflow. That is, an elliptical tube has a higher thermal efficiency than a circular tube for a tube section of the same area. Among these tube types, the water flow resistance and the air flow heat exchange efficiency are considered comprehensively, and the heat exchange tube 11 is an elliptical tube in the most preferred embodiment.

Referring to fig. 2, the first connection box 20 is sleeved on one end of the heat exchanger main body 10. The first connection box 20 is composed of a water box top cover 21 and a water box bottom plate 22. The water box bottom plate 22 is provided with a plurality of heat exchange tube jacks 22a which are arranged in interference fit with the heat exchange tubes 11 to realize rapid mixing of water flow in the heat exchange tubes 11, the interference parts can puncture the tube walls of the heat exchange tubes 11 to form a few bubbles, so that the bubbles are reduced, and then the water box bottom plate 22 is fixed and sealed by welding, and the water box bottom plate 22 is provided with water box flanges all around, and has the function of forming a sealed cavity by pressing with four sides of the water box top cover 21. Two convex hulls, namely a large convex hull 21a and a small convex hull 21b, are arranged on the top cover 21 of the water box, the large convex hull 21a is enclosed to form a first communicating cavity 20b, and the small convex hull 21b is enclosed to form a water inlet cavity 20 a. The small convex hull 21b is also provided with a flanging round hole which is arranged in interference fit with the water inlet joint and then is fixedly sealed by welding. In another embodiment, the water box top cover 21 is further provided with a first buffer chamber and a second buffer chamber, the first buffer chamber is disposed on two opposite sides of the small convex hull 21b and is communicated with the water inlet chamber 20a, and the second buffer chamber is disposed on two opposite sides of the large convex hull 21a and is communicated with the first communication chamber 20b, so that the welding of the heat exchange tube 11 is facilitated and the resistance of the water flow in the connection box is further reduced. In one embodiment, the water box top cover 21 and the water box bottom plate 22 are connected by coating solder paste on the periphery of the water box bottom plate 22, and then the water box top cover 21 is fixed by crimping and sealing to form a structure with two channels of a large convex hull 21a and a small convex hull 21 b.

The water inlet cavity 20a is communicated with the first heat exchange group 13, and the water inlet cavity 20a is further provided with a water inlet for water inlet. The first communicating cavity 20b is respectively communicated with the second heat exchange group 14 and the third heat exchange group 15. It is worth mentioning that the sizes of the water inlet cavity 20a and the first communicating cavity 20b should match the number of the communicating heat exchange tubes 11.

With continued reference to fig. 2, the second junction box 30 is similar in structure to the first junction box 20. Specifically, the second connection box 30 is sleeved on the other end of the heat exchanger main body 10. The second connection box 30 has a water outlet chamber 30a and a second communication chamber 30 b. The water outlet cavity 30a is communicated with the second heat exchange group 14 and is provided with a water outlet for water outlet. The second communicating cavity is respectively communicated with the first heat exchange group 13 and the third heat exchange group 15. Similarly, the sizes of the water inlet cavity 20a and the second communicating cavity 30b should match the number of the communicating heat exchange tubes 11. Further, in order to reduce the resistance of the water flow, the inner walls of the water inlet cavity 20a, the first communicating cavity 20b, the water outlet cavity 30a and the second communicating cavity 30b are all arranged in a smooth manner. Further, the first communicating chamber 20b has a length greater than that of the inlet chamber 20a, and particularly, the outlet chamber 30a has a length equal to that of the inlet chamber 20a, and the second communicating chamber 30b has a length equal to that of the first communicating chamber 20 b. Therefore, the water can not generate bottleneck effect in the flowing process. Referring to fig. 4, the water flow enters the water inlet chamber 20a from the water inlet and flows through the first heat exchange set 13 in the first flow direction; then the water flows into the second communication cavity 30b and flows through the third heat exchange set 15 along the second flow direction; subsequently, the water flows into the first communicating chamber 20b and flows through the second heat exchange set 14 in the first flow direction; and finally flows into the water outlet cavity 30a and flows out of the water outlet, and the whole heat exchange process is completed.

In one embodiment, the first heat exchange group 13, the second heat exchange group 14, and the third heat exchange group 15 are formed by connecting two or more heat exchange tubes 11 in parallel, and each heat exchange group may be formed by connecting the same or different number of tube groups in parallel.

In the present embodiment, the first heat exchange group 13, the second heat exchange group 14 and the third heat exchange group 15 are respectively provided with two heat exchange tubes 11, and in this case (i.e. two channels), the heat exchange group formed by the plurality of heat exchange tubes 11 will help to reduce the resistance of the pipeline. When one channel of the two channels normally flows and the other channel is blocked, or an obstacle or impurities are mixed in the fluid, the flow speed of the two channels is different. According to the bernoulli principle, a channel with a fast flow rate exhibits a lower pressure, and a channel with a slow flow rate exhibits a higher pressure. At the intersection of the two channels, i.e. the first communicating cavity 20b or the second communicating cavity 30b or the water inlet cavity 20a or the water outlet cavity 30a, the fluid with high pressure will flow toward the fluid with low pressure, and then the pressure at the channel opening with high flow speed and the pressure at the channel opening with low flow speed will tend to be balanced, which means that the flow in the channel with low flow speed will exhibit the phenomenon of increasing flow speed. That is, the fluid in the channel with high flow rate can drive the fluid in the channel with low flow rate to flow against the resistance of the fluid. Therefore, the double-channel fluid heat exchange technology reduces the resistance of the side wall of the fluid passage, impurities or other obstacles to the fluid, enhances the heat exchange efficiency and saves the energy consumption of equipment. Similarly, the principle is also applicable to three channels, four channels, and other similar technical solutions, and this embodiment is not described herein in detail. That is, the structure of the heat exchange group with the parallel multiple pipes helps to reduce the resistance of the pipeline.

Referring to fig. 5, fig. 6, fig. 7 and fig. 8, which respectively show a schematic perspective view, a schematic view, an a-a sectional view and a B-B sectional view of the fin 12, and referring to fig. 2, the fin 12 is provided with a spoiler structure, specifically, the fin 12 includes a first convex hull 12a, a flanging hole 12B and a mounting hole 12c, and both flanges of the first convex hull 12a and the flanging hole 12B protrude toward the same side of the fin 12 and are disposed between adjacent mounting holes 12 c. Specifically, the flanging hole 12b is located above the first convex hull 12a, and the mounting hole 12c is used for the heat exchange tube 11 to pass through. In order to enable hot air flow to collide with the fins 12 more, the mounting hole 12c has a mounting hole flanging on the same side as the flanging of the first convex hull 12a or the flanging hole 12b, and the mounting hole flanging, the first convex hull 12a and the flanging hole 12b form a turbulent flow structure between adjacent fins 12. Meanwhile, the mounting hole flanging simplifies the welding process between the fin 12 and the heat exchange tube 11, so that the fin 12 can be smoothly mounted in the length direction of the heat exchange tube 11.

Preferably, the first convex hull 12a is a circular convex hull structure. In order to enhance the turbulent flow effect, the flanged hole 12b has an inverted triangle structure and the height of the top of the flanged hole 12b may be higher than or equal to the height of the top of the mounting hole 12 c. Further, the fin 12 is also provided with a long waist hole flanging 12d which is arranged oppositely, and the long waist hole flanging 12d is close to the top of the flanging of the mounting hole 12c and is arranged in parallel with one side of the flanging hole 12b far away from the long waist hole flanging 12 d. Furthermore, the fins 12 are also provided with sealing flanges 12e which are oppositely arranged, the sealing flanges 12e are arranged in a strip shape, the flange width of the sealing flanges 12e is greater than that of the flange hole 12b or the mounting hole, and the sealing flanges 12e are used for enabling air flow to flow between the adjacent fins 12 of the heat exchanger main body 10, so that a good radiation heat transfer effect is formed. In one embodiment, the height of the protruding part of the first convex hull 12a is lower than the flanging width of the flanging hole 12b or the flanging of the mounting hole, so that part of the air flow collides with the first convex hull 12a, then is turned over to the flanging of the mounting hole for heat exchange, then is turned over to the flanging hole 12b, then is turned over to the flanging of the mounting hole for heat exchange, and is turned over back and forth, and the heat exchange efficiency is increased; part of the air flow directly hits the flanging hole 12b and then is turned over to the mounting hole flanging, so that different turbulent flow path effects are formed, and the high-temperature air flow fully transfers the heat to the fins 12 and the heat exchange tube 11. Preferably, the height of the protruding part of the first convex hull 12a is 1/2-3/4 of the flanging width of the flanging hole 12b or the flanging of the mounting hole, so that the turbulent flow effect is better. The flange width of the flange hole 12b is the same as the flange width of the mounting hole flange and the long waist hole flange 12 d.

In addition, the fins 12 and the heat exchange tube 11 can be fixed in a welding manner besides being tightly connected. Specifically, the fin 12 is provided with a welding rod hole 12f communicated with the mounting hole 12c, and the welding rod hole 12f is semicircular and used for penetrating a welding rod, and the fin 12 is fixed on the heat exchange tube 11 through the welding rod.

It is worth mentioning that the fin 12 is further provided with a first notch 12g and a second notch 12h which are arranged in an arc shape. The first notch 12g is located above the mounting hole 12c, and the second notch 12h is located below the first convex hull 12 a. Preferably, the fins 12 are made of copper or stainless steel having good thermal conductivity. The fin 12 is further provided with a third notch 12i and a fourth notch 12j which are provided in an arc shape. The third notch 12i is located at the lower end of the fin 12, and the fourth notch 12j is located at the upper end of the fin 12. As shown in fig. 6, through the arrangement of the above-mentioned structures such as the first convex hull 12a, the flanging hole 12b, the long waist hole flanging 12d, the sealing flanging 12e, and the mounting hole flanging, when the high-temperature air flows on the surface of the fin 12, the collision chance of the air flow in the fin 12 and the heat exchange tube 11 can be increased, and the heat exchange efficiency can be increased, meanwhile, the arrangement of the second notch 12h can reduce the resistance of the air flow at the lower end of the fin 12, so that the air flow has greater power in the turbulent flow structure, the collision frequency is further increased, and the arrangement of the third notch 12i can increase the direction of the air flow because it is connected with the bottom of the sealing flanging 12e and is located at the middle lower part of the mounting hole flanging, so that the high-temperature air flow can better flow into the heat exchanger main body 10. The first gap 12g and the fourth gap 12j are arranged to allow low-temperature air to rapidly flow out of the heat exchanger main body 10, thereby preventing the temperature of the upper portion of the heat exchanger main body 10 from being reduced, and reducing the overall heat exchange efficiency. In addition, the protrusions arranged at intervals with the second notches 12h may be complementary to the first notches 12g in view of saving material, i.e., the first notches 12g and the second notches 12h may be designed to save material. The third notch 12i and the fourth notch 12j are designed to blunt the sharp corner on the fin 12, so as to prevent the sharp corner of the fin 12 from scratching an operator.

the heat exchanger includes a heat exchanger body, a first connection box, and a second connection box. The heat exchanger main part changes traditional single tube series structure, adopts the multitube to connect in parallel and constitutes the heat transfer group, and first heat transfer group, third heat transfer group and second heat transfer group establish ties the structure that forms the pipeline, help reducing the resistance of pipeline, improve heat exchanger's heat exchange efficiency.

Secondly, the structure of parallel connection of multiple tubes is beneficial to enhancing the reliability of products. That is, when one or more heat exchange tubes are blocked, the whole set of heat exchange tubes can still work as long as one heat exchange tube of the heat exchange set is in a circulation state, and the whole heat exchanger can still work.

Thirdly, adopt the connecting box structure intercommunication between first heat transfer group and third heat transfer group, second heat transfer group and third heat transfer group, the connecting box is compared in traditional U-shaped pipe, has saved the tub process step that rises that aligns with the pipe center, changes the welding mode between tub and the pipe for tub and plane, water box and planar welding mode, has reduced the welding degree of difficulty, has reduced the defective rate of product effectively. Meanwhile, the bending of the pipeline can be reduced, so that the pipeline resistance of the heat exchanger is reduced, and the problems that the existing heat exchanger is large in system resistance, easy to scale and even plugged, so that the system circulation is not good and the noise of the heat exchanger is low are solved.

Finally, the heat exchanger optimizes the fin structure, improves the heat exchange efficiency, does not reduce the thickness of the fins on the premise of ensuring the performance and the service life, and improves the heat exchange efficiency of the heat exchanger by optimizing the fin structure.

The invention also provides a gas heating water heater of any embodiment, which comprises the heat exchanger of any embodiment. Because the heat exchanger has the technical effects of reducing pipeline resistance, improving heat exchange efficiency, improving reliability, reducing the reject ratio of products, reducing the probability of pipeline blockage and the like, the gas heating water heater can also realize the technical effects.

It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims

1. A heat exchanger, comprising:

the heat exchanger comprises a heat exchanger main body, a heat exchanger and a heat exchanger fin; each heat exchange tube is a first heat exchange group, a second heat exchange group and a third heat exchange group, wherein the first heat exchange group, the second heat exchange group and the third heat exchange group are arranged side by side and form a first circulation direction, and the third heat exchange group is arranged between the first heat exchange group and the second heat exchange group; the fins are sleeved on the heat exchange tubes at intervals along the length direction of the heat exchange tubes and separate the heat exchange tubes;

the first connecting box is sleeved at one end of the heat exchanger main body; the first connecting box is provided with a water inlet cavity and a first communicating cavity, and the water inlet cavity is communicated with the first heat exchange group; the first communication cavity is communicated with the second heat exchange group and the third heat exchange group; and

the second connecting box is sleeved at the other end of the heat exchanger main body; the second connecting box is provided with a water outlet cavity and a second communicating cavity, and the water outlet cavity is communicated with the second heat exchange group; the second communicating cavity is communicated with the first heat exchange group and the third heat exchange group.

2. The heat exchanger of claim 1, wherein the heat exchange tube is at least one of an oval tube, a flat tube, and a profiled tube.

3. The heat exchanger of claim 1, wherein the first communication chamber has a length greater than a length of the inlet or outlet chamber, and the second communication chamber has a length equal to the length of the first communication chamber.

4. The heat exchanger of claim 1, wherein the fin is provided with a first convex hull, a flanging hole and mounting holes, the flanging of the first convex hull and the flanging hole are both protruded towards the same side of the fin and are arranged between the adjacent mounting holes, and the flanging hole is positioned above the first convex hull; the mounting hole is used for the heat exchange tube to penetrate through, the mounting hole is provided with a mounting hole flanging which is at the same side as the first convex hull or the flanging hole flanging, and the mounting hole flanging is adjacent to the first convex hull and the flanging hole flanging to form a turbulence structure between the fins.

5. The heat exchanger of claim 4, wherein the first convex hull is a circular convex hull structure, the burring hole is an inverted triangular structure, and the height of the top end of the burring hole is higher than that of the top end of the mounting hole.

6. The heat exchanger as claimed in claim 4, wherein said fin is further provided with a welding rod hole communicating with said mounting hole, and said welding rod hole is semicircular.

7. The heat exchanger of claim 4, wherein the fins are further provided with oppositely arranged long waist-hole flanges, and the long waist-hole flanges are close to the tops of the mounting-hole flanges and are arranged in parallel with one sides of the flanging holes far away from the long waist-hole flanges.

8. The heat exchanger as claimed in claim 4, wherein the fin further has a first notch, a second notch, a third notch and a fourth notch arranged in an arc shape, the first notch is located above the mounting hole, the second notch is located below the first convex hull, the third notch is located at a lower end of the fin, and the fourth notch is located at an upper end of the fin.

9. The heat exchanger of claim 4, wherein the fins are further provided with oppositely arranged sealing flanges, the sealing flanges are arranged in a strip shape, and the flange width of the sealing flanges is larger than that of the flanges of the flanging holes or the mounting holes.

10. A gas-fired water heater comprising the heat exchanger of any one of claims 1 to 9.