CN114440665A - Heat Exchangers and Gas Heating Water Heaters - Google Patents

Abstract

Embodiments of the present invention relate to the technical field of heat exchangers, and 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 main body of the heat exchanger includes 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 arranged side by side, and the third heat exchange group is arranged in the first heat exchange group. between the heat exchange group and the second heat exchange group; the first connection box is sleeved on one end of the heat exchanger body; the first connection box has a water inlet cavity and a first communication cavity, and the water inlet cavity communicates with the first heat exchange group The first communication cavity is communicated with the second heat exchange group and the third heat exchange group; the second connection box is sleeved on the other end of the heat exchanger body; the second connection box has a water outlet cavity and a second communication cavity, and the water outlet cavity is connected with The second heat exchange group is in communication; the second communication cavity is in communication with the first heat exchange group and the third heat exchange group. The heat exchanger reduces the pipeline resistance and improves the heat exchange efficiency through the side-by-side pipeline design.

Description

Heat Exchangers and Gas Heating Water Heaters

technical field

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

Background technique

A heat exchanger, also known as a heat exchanger, is a device that transfers heat from a high temperature fluid to a low temperature fluid to meet specified process requirements. It is an industrial application of heat convection, heat radiation and heat conduction. The gas heating water heater uses natural gas as fuel. The natural gas is burned by the burner to generate high-temperature flue gas. The high-temperature flue gas flows through the heat exchanger, and the heat energy of the high-temperature flue gas is transferred to the low-temperature system circulating water through the heat exchanger for heat exchange, and then The fan discharges the low-temperature flue gas after heat exchange to the outside, and circulates the system water through the circulating pump to take away the heat absorbed by the system water from the heat exchanger in time. The finned heat exchanger is commonly used as a heat exchanger in the gas heating water heater. The finned heat exchanger is a heat exchanger for heat exchange between gas and liquid. To achieve the purpose of strengthening heat transfer, the heat exchange process is mainly convection heat exchange and radiation heat exchange, so as to increase the heat exchange area between the high temperature flue gas and the main heat exchanger, increase the heat exchange efficiency, and transfer the heat to the pipes in the pipeline. system water.

The heat exchange tubes used in the existing heat exchangers are generally single-tube series-connected structures. The heat-exchange tubes of the single-tube series-connected structure need to be connected by welding U-shaped tubes at both ends of the straight tubes. The resistance of the tortuous system is large, and a larger circulating pump power is required to overcome the resistance generated by the pipeline, which leads to a large throttling effect in the high-temperature water after heat exchange, which causes heat loss and reduces heat exchange efficiency. In addition, this type of structure has higher requirements on the dimensional accuracy of the U-shaped pipe interface, so it has higher requirements on the pipe expansion process, and at the same time, there are many interfaces that need to be welded, resulting in a higher risk of water leakage at the interface and poor heat exchanger products. high rate.

SUMMARY OF THE INVENTION

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

The present invention also provides a gas heating water heater using the above heat exchanger.

A technical solution adopted by the present invention is to provide a heat exchanger, which includes a heat exchanger body, a first connection box and a second connection box. Wherein, the main body of the heat exchanger includes a plurality of heat exchange tubes and fins; each of the heat exchange tubes is a first heat exchange group, a second heat exchange group and a second heat exchange group arranged side by side and forming a first flow direction The third heat exchange group in the direction of It is provided on the heat exchange tubes and separates the heat exchange tubes. The first connection box is sleeved on one end of the heat exchanger body; the first connection box has a water inlet cavity and a first communication 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. The second connection box is sleeved on the other end of the heat exchanger body; the second connection box has a water outlet cavity and a second communication cavity, and the water outlet cavity is communicated with the second heat exchange group; the The second communication 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 oval tube, a flat tube, and a special-shaped tube.

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

Optionally, the fins are provided with a first convex hull, a flanging hole and a mounting hole, and the first convex hull and the flanging hole flanging all protrude toward the same side of the fin and are located adjacent to each other. Between the installation holes, the flanging hole is located above the first convex hull; the installation hole is used for the heat exchange tube to pass through, and the installation hole has a connection with the first convex hull or a flip-up hole. The mounting hole on the same side of the side hole is flanged, and the mounting hole flanging, the first convex hull and the flanging hole flanging form a turbulent flow structure between the adjacent fins.

Optionally, the first convex hull is a circular convex hull structure, the flanging hole is an inverted triangular structure, and the height of the top of the flanging hole is higher than the height of the top of the mounting hole.

Optionally, the fin is further provided with a welding rod hole communicating with the mounting hole, and the welding rod hole is arranged in a semicircle.

Optionally, the fins are also provided with oppositely arranged long waist hole flanging, the long waist hole flanging is close to the top of the mounting hole flanging and is turned away from the long waist hole from the flanging hole. One side of the side is set parallel.

Optionally, the fins are further provided with arc-shaped first notch, second notch, third notch and fourth notch, the first notch is located above the installation hole, and the second notch is located at the 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 fins are also provided with oppositely arranged sealing flanges, the sealing flanges are arranged in strips and the flange width of the sealing flanges is larger than that of the flanged holes or the flanges of the mounting holes. side width.

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

The heat exchanger of the present invention changes the traditional single-tube series structure, adopts multiple tubes in parallel to form a heat exchange group, 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, which helps It is used to reduce the resistance of the pipeline and improve the heat exchange efficiency of the heat exchanger.

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

The heat exchanger of the present invention adopts a connection box structure to communicate between the first heat exchange group and the third heat exchange group, and between the second heat exchange group and the third heat exchange group. Compared with the traditional U-shaped tube, the connection box, The process step of pipe-raising in which the pipe is aligned with the center of the pipe is omitted, and the welding method between the pipe and the pipe is changed to the welding method of the pipe and the plane, the water box and the plane, which reduces the difficulty of welding and effectively reduces the defect rate of the product. At the same time, it can reduce the bending of the pipeline, thereby reducing the pipeline resistance of the heat exchanger, and solve the problems that the existing heat exchanger system has high resistance, easy scaling or even plugging, which leads to poor system circulation and heat exchanger noise.

The heat exchanger of the present invention optimizes the fin structure to improve the heat exchange efficiency. On the premise of ensuring performance and service life, the fin thickness is not reduced, and the heat exchange efficiency of the heat exchanger is improved by optimizing the fin structure.

Description of drawings

In order to more clearly describe the specific embodiments of the present invention or the technical solutions in the prior art, the specific embodiments will be briefly introduced below. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. In the drawings, each element or section is not necessarily drawn to actual scale.

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

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

Figure 3 is a schematic plan view of the heat exchanger.

Figure 4 is a schematic diagram of the flow of water in the heat exchanger.

5 is a schematic perspective view of a fin.

FIG. 6 is a schematic diagram of the flow of air on the surface of the fin.

FIG. 7 is a cross-sectional view of A-A in FIG. 6 .

FIG. 8 is a cross-sectional view of B-B in FIG. 6 .

In the figure: 10, main body of heat exchanger; 11, heat exchange tube; 12, fins; 12a, first convex hull; 12b, flanging hole; 12c, mounting hole; 12d, long waist hole flanging; 12e, sealing Flanging; 12f, electrode hole; 12g, first notch; 12h, second notch; 12i, third notch; 12j, fourth notch; 13, first heat exchange group; 14, second heat exchange group; 15, The third heat exchange group;

20, the first connection box; 20a, the water inlet cavity; 20b, the first communication cavity; 21, the top cover of the water box; 21a, the large convex hull; 21b, the small convex hull; 22, the bottom plate of the water box; 22a, the heat exchange tube jack;

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

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element, or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terms used in the description of the present invention are only for the purpose of describing specific embodiments, and are not used to limit the present invention. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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

Please refer to FIG. 1 , FIG. 2 , FIG. 3 , and FIG. 4 together, which respectively show a three-dimensional schematic diagram, an exploded schematic diagram, a schematic plan view, and the first heat exchange group 13 and the second heat exchange group of the heat exchanger according to the embodiment of the present invention. 14. A schematic diagram of the connection between the third heat exchange group 15 and the first connection box 20 and the second connection box 30 . The heat exchanger includes a heat exchanger body 10 , a first connection box 20 and a second connection box 30 . Each part 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, so as to realize the heat exchange process. The fins 12 increase the heat exchange area, and at the same time use their structure to increase the collision chance of the high-temperature airflow with the fins 12 and the heat exchange tubes 11, thereby further improving the heat exchange efficiency. In this embodiment, the fins 12 are sleeved on the heat exchange tubes 11 at intervals along the length direction of the heat exchange tubes 11 and separate the heat exchange tubes 11 so that the airflow can pass along the fins 12 and the heat exchange tubes. 11. Outflow from the gap formed between the connection boxes to increase the heat exchange efficiency of convection heat exchange and radiation heat exchange.

3 and 4, a plurality of heat exchange tubes 11 are arranged side by side and are 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 in the first heat exchange group 13. Between the first heat exchange group 13 and the second heat exchange group 14 . The basis of the grouping is that the fluid flow directions of the heat exchange tubes 11 of each heat exchange group are consistent, wherein the liquid flow directions in the tubes of the first heat exchange group 13 and the second heat exchange group 14 are the same, which is defined as the first flow direction; The flow direction of the liquid in the tubes of the heat exchange group 15 is the second flow direction. The first flow direction and the second flow direction completely constitute the direction of the meandering flow of the water flow in the tube. In this specific embodiment, the first circulation direction and the second circulation direction are opposite. In other embodiments, the first circulation direction and the second circulation direction may also be other curved shapes, which are not limited in this specific embodiment. . It is worth mentioning that the heat exchange tube 11 can be an elliptical tube or a flat tube, or a special-shaped tube. During the process, the contact area between the above several tube types and the hot air flow is larger. Taking an elliptical tube as an example, its long axis is set in the vertical direction, so that the surface of the tube can be more fully contacted with the airflow. That is, the elliptical tube has higher thermal efficiency than the circular tube for the tube section under the same area. Among these types of tubes, the water flow resistance and the air flow heat exchange efficiency are comprehensively considered. In the preferred embodiment, the heat exchange tube 11 is an elliptical tube.

Please refer to FIG. 2 , the first connection box 20 is sleeved on one end of the heat exchanger body 10 . The first connection box 20 is composed of two parts: the top cover 21 of the water box and the bottom plate 22 of the water box. The bottom plate 22 of the water box is provided with a number of heat exchange tube insertion holes 22a, which are installed in an interference fit with the heat exchange tube 11 to achieve rapid mixing of the water flow in the heat exchange tube 11, and the interference part can pierce the wall of the heat exchange tube 11. A few air bubbles are formed to reduce the generation of air bubbles, and then they are fixed and sealed by welding. The water box bottom plate 22 is provided with water box flanging around it, and its function is to press the four sides of the water box top cover 21 to form a sealed cavity. The top cover 21 of the water box is provided with two convex hulls, namely a large convex hull 21a and a small convex hull 21b, the large convex hull 21a encloses a first communication cavity 20b, and the small convex hull 21b forms a water inlet cavity 20a. The small convex hull 21b is also provided with a flanging round hole, which is installed in an interference fit with the water inlet joint, and is then fixed and sealed by welding. In another embodiment, the top cover 21 of the water box is further provided with a first buffer cavity and a second buffer cavity. The first buffer cavity is provided on opposite sides of the small convex hull 21b and communicates with the water inlet cavity 20a. The two buffer cavities are disposed on opposite sides of the large convex hull 21a and communicate with the first communication cavity 20b, so as to facilitate the welding of the heat exchange tubes 11 and further reduce the resistance of water flow in the connection box. In one embodiment, the connection between the top cover 21 of the water box and the bottom plate 22 of the water box is by applying solder paste around the bottom plate 22 of the water box, and then sealing and fixing the top cover 21 of the water box by crimping to form a large convex hull 21a and the structure of the two channels of the small convex hull 21b.

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

Please continue to refer to FIG. 2 , the structure of the second connection box 30 is similar to that of the first connection 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 cavity 30a and a second communication cavity 30b. The water outlet cavity 30a communicates with the second heat exchange group 14 and is provided with a water outlet for water outlet. The second communication cavity is communicated with the first heat exchange group 13 and the third heat exchange group 15 respectively. Similarly, the cavity size of the water inlet cavity 20a and the second communication cavity 30b should match the number of the communication heat exchange tubes 11 . Further, in order to reduce the water flow resistance, the inner walls of the water inlet cavity 20a, the first communication cavity 20b, the water outlet cavity 30a, and the second communication cavity 30b are all arranged in a smooth shape. Further, the length of the first communication cavity 20b is greater than that of the water inlet cavity 20a, in particular, the length of the water outlet cavity 30a is equal to the length of the water inlet cavity 20a, and the length of the second communication cavity 30b is equal to the length of the first communication cavity 20b. In this way, the bottleneck effect can be avoided in the water flow process. Referring to FIG. 4, the water flow enters the water inlet cavity 20a from the water inlet, and flows through the first heat exchange group 13 along the first flow direction; then the water flow flows into the second communication cavity 30b, and flows through the third heat exchange group along the second flow direction 15; Next, the water flow flows into the first communication cavity 20b, and flows through the second heat exchange group 14 along the first flow direction; and finally flows into the water outlet cavity 30a and flows out of the water outlet to complete the entire heat exchange process.

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 two or more heat exchange tubes 11 connected in parallel, and each heat exchange group may be the same or The number of different tube groups is connected in parallel.

In this 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 . The heat exchange group formed by a plurality of heat exchange tubes 11 will help to reduce the pipeline resistance. When the fluid in one channel of the dual channels flows normally, while the fluid flow in the other channel is blocked, or there are obstacles or the fluid is mixed with impurities, the flow rate of the two channels is different. According to Bernoulli's principle, a channel with a fast flow rate has a lower pressure, and a channel with a slow flow rate has a higher pressure. At the intersection of the two channels, namely the first communication chamber 20b or the second communication chamber 30b or the water inlet chamber 20a or the water outlet chamber 30a, the fluid with high pressure will rush to the fluid with low pressure, and then the pressure and flow rate of the channel with fast flow rate will increase. The pressure at the port of the slow channel will tend to balance, which means that the fluid in the channel with the slow flow rate will show the phenomenon of increasing the flow rate. That is, the fluid in the channel with fast flow can drive the fluid in the channel with slow flow to overcome its resistance to flow. Therefore, the dual-channel fluid heat exchange technology reduces the resistance of the side walls of the fluid passage, impurities or other obstacles to the fluid, enhances the heat exchange efficiency, and saves the energy consumption of the equipment. Similarly, this principle is also applicable to similar technical solutions such as three-channel, four-channel, etc., which will not be repeated in this embodiment. That is, the multi-tube parallel heat exchange group structure helps to reduce the resistance of the pipeline.

Please refer to FIG. 5 , FIG. 6 , FIG. 7 and FIG. 8 , which respectively show a three-dimensional schematic diagram of the fin 12 , a schematic diagram of the airflow of the fin 12 , A-A cross-sectional view and B-B cross-sectional view, and then referring to FIG. 2 , the fins 12 are provided with There is a spoiler structure. Specifically, the fin 12 includes a first convex hull 12a, a flanging hole 12b and a mounting hole 12c. It is arranged between adjacent mounting holes 12c. Specifically, the flanged 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 allow the hot air to collide more on the fins 12, 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 flanging of the mounting hole and the first convex hull 12a. The flanging holes 12b are flanged to form a turbulent flow structure between the adjacent fins 12 . Meanwhile, the flanging of the mounting holes simplifies the welding process between the fins 12 and the heat exchange tubes 11 , so that the fins 12 can be smoothly installed along the length direction of the heat exchange tubes 11 .

Preferably, the first convex hull 12a is a circular convex hull structure. In order to enhance the turbulence effect, the flanged hole 12b has an inverted triangular structure and the height of the top of the flanged hole 12b can be higher than or equal to the height of the top of the installation hole 12c. Further, the fins 12 are also provided with oppositely arranged long waist hole flanging 12d. The long waist hole flanging 12d is close to the top of the flanging of the mounting hole 12c and is far from the long waist hole flanging with the flanging hole 12b. One side of 12d is set parallel. Further, the fins 12 are also provided with oppositely arranged sealing flanges 12e, the sealing flanges 12e are arranged in strips and the flange width of the sealing flanges 12e is larger than the flanged holes 12b or the mounting hole flanges. The sealing flange 12e is used to make the air flow along the adjacent fins 12 of the heat exchanger main body 10 to form a better radiation heat transfer effect. In one embodiment, the height of the protruding portion of the first protruding shell 12a is lower than the flange width of the flanged hole 12b or the flange of the mounting hole, so that part of the airflow collides with the first protruding shell 12a and then folds over to the mounting hole Flange for heat exchange, then fold to the flanging hole 12b, and then fold to the mounting hole for flanging heat exchange, and fold back and forth to increase the heat exchange efficiency; part of the airflow directly hits the flanging hole 12b, and then Folded over to the flange of the mounting hole to form different turbulent path effects, so that the high-temperature airflow can fully transfer heat to the fins 12 and the heat exchange tubes 11 . Preferably, the height of the protruding portion of the first convex hull 12a is 1/2-3/4 of the flange width of the flanged hole 12b or the flange of the mounting hole, so that the effect of turbulence is better. The flanging width of the flanging hole 12b is the same as the flanging width of the mounting hole flanging and the long waist hole flanging 12d.

In addition, the fins 12 and the heat exchange tubes 11 can be fixed by welding in addition to being tightly connected. Specifically, the fins 12 are provided with electrode holes 12f that communicate with the mounting holes 12c. The electrode holes 12f are semicircular and are used to pass through electrodes, and the fins 12 are fixed on the heat exchange tubes 11 by the electrodes.

It is worth mentioning that the fins 12 are further provided with arc-shaped first notches 12g and second notches 12h. The first notch 12g is located above the mounting hole 12c, and the second notch 12h is located below the first boss 12a. Preferably, the fins 12 are made of copper or stainless steel with better thermal conductivity. In addition, the fins 12 are also provided with arc-shaped third notches 12i and fourth notches 12j. The third notch 12 i is located at the lower end of the fin 12 , and the fourth notch 12 j 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, the mounting hole flanging, etc. When flowing, the collision chance of the airflow in the fins 12 and the heat exchange tubes 11 can be increased, and the heat exchange efficiency can be increased. The spoiler structure has greater power, and the number of collisions is further increased. The arrangement of the third gap 12i, because it is connected to the bottom of the sealing flange 12e and is located in the middle and lower part of the flange of the installation hole, can increase the guidance of the air flow and make the The high temperature airflow can flow into the heat exchanger body 10 better. The arrangement of the first notch 12g and the fourth notch 12j can quickly flow the low-temperature airflow out of the heat exchanger main body 10 to avoid lowering the temperature of the upper part of the heat exchanger main body 10 and reduce the overall heat exchange efficiency. In addition, from the viewpoint of saving materials, the protrusions arranged alternately with the second notches 12h can be complementary to the first notches 12g, that is, the design of the first notches 12g and the second notches 12h can save materials. The third notch 12i and the fourth notch 12j are designed so that the sharp corners on the fins 12 are blunt, so as to prevent the sharp corners of the fins 12 from scratching the operator.

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

The heat exchanger includes a heat exchanger body, a first connection box and a second connection box. The main body of the heat exchanger changes the traditional single-tube series structure, and adopts multiple tubes in parallel to form a heat exchange group. 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, which helps to reduce The resistance of the small pipeline improves the heat exchange efficiency of the heat exchanger.

Secondly, the multi-tube parallel structure is beneficial to enhance the reliability of the product. That is, when one or more heat exchange tubes are blocked, as long as one heat exchange tube in the heat exchange group is in a circulating state, the whole group of heat exchange tubes can still continue to work, and the heat exchanger as a whole can still work.

Again, the connection box structure is used between the first heat exchange group and the third heat exchange group, the second heat exchange group and the third heat exchange group. In the process of pipe expansion, the center of the pipe is aligned, and the welding method between the pipe and the pipe is changed to the welding method of the pipe and the plane, the water box and the plane, which reduces the difficulty of welding and effectively reduces the defect rate of the product. At the same time, it can reduce the bending of the pipeline, thereby reducing the pipeline resistance of the heat exchanger, and solve the problems that the existing heat exchanger system has high resistance, easy scaling or even plugging, which leads to poor system circulation and heat exchanger noise.

Finally, the heat exchanger of the present invention optimizes the fin structure to improve the heat exchange efficiency. On the premise of ensuring performance and service life, the fin thickness is not reduced, and the heat exchange efficiency of the heat exchanger is improved by optimizing the fin structure. .

The present invention also provides a specific embodiment of the gas heating water heater, which includes the heat exchanger of any of the above specific embodiments. Because the heat exchanger has the technical effects of reducing pipeline resistance, improving heat exchange efficiency, improving reliability, reducing product defect rate and reducing the probability of pipeline blockage, the gas heating water heater can also achieve the above technical effects.

It should be noted that the description of the present invention and the accompanying drawings provide preferred embodiments of the present invention, however, the present invention can be implemented in many different forms, and is not limited to the embodiments described in this specification. These examples are not intended as additional limitations to the content of the present invention, and are provided for the purpose of providing a more thorough and complete understanding of the present disclosure. In addition, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present invention; further, for those of ordinary skill in the art, they can be improved or transformed according to the above description. , and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (10)

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.

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