Heat exchanger and gas water heater

Abstract

This utility model relates to the field of gas water heater technology, and discloses a heat exchanger and a gas water heater. The heat exchanger includes a shell, multiple heat exchange tubes, a cold water inlet pipe, and a hot water outlet pipe. The shell has a heat exchange zone inside, with an outlet at one end along a first direction and an inlet at the other end along the same first direction. Multiple heat exchange tubes are sequentially arranged within the heat exchange zone along a second direction. These multiple heat exchange tubes are connected in parallel with the cold water inlet pipe and the hot water outlet pipe. Because the flue gas flows through the heat exchange zone in the first direction, and this first direction is perpendicular to the second direction, it ensures that the flue gas can directly and fully scour each heat exchange tube. The multiple heat exchange tubes divide the cold water into multiple independent streams, allowing simultaneous and large-area direct contact with the high-temperature flue gas, increasing the effective heat exchange area and heat exchange opportunities, and achieving efficient recovery and full utilization of flue gas heat. This solves the technical problem of low heat exchange rate in heat exchangers, which leads to serious waste of flue gas heat.

Description

Technical Field

[0001] This utility model relates to the field of gas water heater technology, specifically to heat exchangers and gas water heaters. Background Technology

[0002] A gas water heater is a machine that quickly produces hot water by exchanging heat between the high-temperature flue gas generated from burning natural gas and copper pipes. In the current working process of a gas water heater's heat exchanger, cold water enters the heat exchange zone from one end of the copper pipe in a single-channel manner, then spirals along the flue gas flow direction within a spiral tube, finally exiting from the other end. When the cold water first enters the heat exchange zone, due to the large temperature difference with the flue gas, the heat exchange rate between the low-temperature water and the flue gas is rapid, and the cold water temperature rises quickly. However, as the hot water continues to flow back and forth along the flue gas flow direction, the temperature difference between it and the flue gas gradually decreases. Because the hot water cannot fully absorb the heat from the flue gas, the heat exchange rate decreases, resulting in a significant waste of heat from the flue gas. Utility Model Content

[0003] In view of this, the present invention provides a heat exchanger and a gas water heater to solve the problem of low heat exchange rate of the heat exchanger, which causes serious waste of flue gas heat.

[0004] In a first aspect, this utility model provides a heat exchanger, comprising:

[0005] The housing has an internal heat exchange zone, an air outlet at one end along a first direction, and an air inlet at the other end along the first direction. The air inlet is used to communicate with the burner.

[0006] Multiple heat exchange tubes are arranged sequentially in the heat exchange zone along the second direction;

[0007] A cold water inlet pipe is provided, and multiple heat exchange tubes are connected in parallel with the cold water inlet pipe.

[0008] A hot water outlet pipe, and multiple heat exchange tubes are connected in parallel with the hot water outlet pipe;

[0009] Wherein, the first direction is perpendicular to the second direction.

[0010] Beneficial effects: By installing multiple heat exchange tubes arranged along the second direction within the heat exchange zone, cold water flows in from the cold water inlet pipe and is then distributed to each heat exchange tube. Since the flue gas flows through the heat exchange zone in the first direction, perpendicular to the second direction, it ensures that the flue gas can directly and fully wash the outer surface of each heat exchange tube. The multiple heat exchange tubes arranged along the second direction divide the cold water into several independent streams, allowing for simultaneous and large-area direct contact with the high-temperature flue gas. This significantly increases the effective heat exchange area and heat exchange opportunities, achieving efficient recovery and full utilization of flue gas heat. Therefore, it solves the technical problem of low heat exchange rate in heat exchangers, which leads to serious waste of flue gas heat.

[0011] In one optional embodiment, both the cold water inlet pipe and the hot water outlet pipe are disposed on one side of the housing along a third direction; the third direction is the extension direction of the heat exchange tube; and the third direction forms an angle with both the first direction and the second direction; the heat exchange tube includes:

[0012] The water inlet pipe is connected to the cold water inlet pipe;

[0013] The return water pipe is connected at one end to the end of the inlet pipe away from the cold water inlet pipe, and at the other end to the hot water outlet pipe.

[0014] Beneficial effects: Because the cold water inlet and hot water outlet are located on the same side of the shell, and the heat exchange tubes use a structure where the inlet pipe is connected to the cold water inlet pipe, and the return pipe is connected to the inlet pipe and the hot water outlet pipe at both ends respectively, cold water enters the heat exchange tubes through the cold water inlet pipe, undergoes heat exchange in the heat exchange zone, and then flows back and forth at least once through the return pipe before finally being discharged through the hot water outlet pipe. During this round trip, the cold water is ensured to have sufficient flow time and a longer heat exchange path in the heat exchange zone, allowing for full contact with the flue gas and thus more effectively absorbing waste heat from the flue gas, improving the efficiency of waste heat recovery. Furthermore, placing both the cold water inlet and hot water outlet on one side of the shell along a third direction makes the pipe connections of the heat exchanger more concentrated and compact, facilitating installation and maintenance.

[0015] In one alternative embodiment, the water inlet pipe is a spiral pipe extending spirally along the third direction.

[0016] Beneficial effects: By designing the inlet pipe as a spiral tube, the spiral structure significantly increases the effective length and total heat exchange area of ​​the inlet pipe within a limited space. This allows for more thorough heat exchange between the cold water and the surrounding environment as it flows through the inlet pipe, extending the contact time between the cold water and the high-temperature flue gas, resulting in more complete heat absorption. Furthermore, the spiral structure transforms the water flow into turbulent flow, effectively disrupting the laminar boundary layer near the pipe wall, increasing the convective heat transfer coefficient between the fluid and the pipe wall, making heat transfer more efficient, and maximizing the efficiency of flue gas heat recovery within a compact space.

[0017] In one alternative embodiment, the inlet pipe is arranged around the outer periphery of the corresponding return pipe.

[0018] Beneficial Effects: By circling the corresponding return water pipe around its outer periphery, the internal spatial structure of the heat exchanger is optimized. This achieves efficient integration of the inlet and return water pipes within a limited space, avoiding cluttered pipework and making the overall layout more compact and rational, saving space. Furthermore, since the return water pipe carries a fluid with a relatively high temperature after heat exchange, there is usable residual heat around it. The inlet pipe's circumference allows the cold water in the inlet pipe to absorb this residual heat more directly and efficiently, extending the contact time and area between the cold water and the residual heat, thus significantly improving heat exchange efficiency. This allows the cold water to heat up faster, increasing the energy utilization rate of the entire heat exchange process. Moreover, the outer inlet pipe acts as a heat shield, significantly reducing heat loss from the inner return water pipe and effectively suppressing the temperature drop of the hot water during flow, ensuring the temperature of the hot water flowing into and exiting the pipe.

[0019] In one alternative implementation, the return water pipe is a straight pipe extending in a straight line along the third direction.

[0020] Beneficial effects: The straight-lined pipe minimizes water flow resistance in the return pipe. When hot water flows in the return pipe, there is no additional energy loss due to pipe bends or turns, resulting in smoother and more stable water flow. It also achieves the shortest path for hot water output, minimizing heat loss during transport and ensuring efficient flow of hot water from the return pipe to the outlet pipe, thus improving water delivery efficiency. Furthermore, the straight-pipe structure eliminates the need for complex bending and connecting operations during installation, significantly reducing installation difficulty and time costs, improving installation efficiency, facilitating inspection and maintenance, reducing the complexity and workload of maintenance work, and lowering maintenance costs.

[0021] In one optional embodiment, a reversing pipe is also included, which is disposed on one side of the housing and connected to both the inlet pipe and the return pipe.

[0022] Beneficial effect: By setting up a reversing pipe to connect the end of the inlet pipe and the beginning of the return pipe, the fluid can smoothly change its flow direction through the reversing pipe after completing the flow in the inlet pipe, and transition from the inlet pipe to the return pipe, thus completing the reversing operation of the fluid between the inlet pipe and the return pipe.

[0023] In one optional implementation, the commutator includes:

[0024] The first connecting pipe extends along the second direction and is connected in parallel with the plurality of water inlet pipes;

[0025] The second connecting pipe is spaced apart from the first connecting pipe along the first direction, the second connecting pipe extends along the second direction, and is connected to the plurality of the return water pipes;

[0026] The third connecting pipe is connected at both ends to the first connecting pipe and the second connecting pipe, respectively.

[0027] Beneficial effects: The first connecting pipe extends along the second direction and connects in parallel with multiple inlet pipes, efficiently and evenly integrating and converging water flows from multiple inlet pipes. The second connecting pipe extends along the second direction and connects with multiple return pipes, ensuring that water flow can be distributed to multiple return pipes. Furthermore, since both the first and second connecting pipes extend parallel to each other along the second direction and are spaced apart, and the two ends of the third connecting pipe are connected to the first and second connecting pipes respectively, a complete and smooth fluid diversion channel is formed, ensuring that water flow smoothly transitions from the first connecting pipe to the second connecting pipe, and the pipeline layout is clear and orderly.

[0028] In one alternative embodiment, a first connecting pipe is further included, which is disposed on the outside of the housing, extends along the second direction, and is connected to the plurality of water inlet pipes and the cold water inlet pipe.

[0029] Beneficial effects: By placing the first connecting pipe on the outside of the housing, the space outside the housing is utilized, avoiding the congestion and interference caused by arranging too many pipes in the limited space inside the housing, making the internal structure of the housing more compact, simple, and orderly; it also facilitates connection with an external cold water source, reducing the difficulty and cost of installation and maintenance, and improving the efficiency of installation and maintenance. Furthermore, the first connecting pipe is simultaneously connected to multiple inlet pipes and the cold water inlet pipe, realizing centralized distribution of the cold water source; and because the first connecting pipe extends along the second direction, it provides a stable flow path for the cold water after entering from the cold water inlet pipe, which can evenly and efficiently distribute the cold water to multiple inlet pipes, ensuring that each inlet pipe receives a sufficient and balanced supply of cold water.

[0030] In an optional embodiment, a second connecting pipe is further included, which is disposed on the outside of the housing, extends along the second direction, and is connected to the plurality of return water pipes and the hot water outlet pipe.

[0031] Beneficial effects: By placing the second connecting pipe on the outside of the casing, the space outside the casing is utilized, avoiding the congestion and interference caused by arranging too many pipes in the limited space inside the casing, making the internal structure of the casing more compact, simple, and orderly; it also facilitates the connection with the hot water outlet pipe, reduces the difficulty and cost of installation and maintenance, and improves the efficiency of installation and maintenance. Since the second connecting pipe extends along the second direction and connects with multiple return water pipes and hot water outlet pipes, it provides a smooth collection channel for hot water in the return water pipes, which can efficiently and evenly collect hot water from multiple return water pipes and then centrally transport it to the hot water outlet pipe; it ensures that hot water can flow out stably and orderly, avoiding pressure fluctuations and water flow turbulence caused by poor collection of hot water in the return water pipes, and ensuring the stability and continuity of hot water output.

[0032] In one optional embodiment, the cross-sectional area of ​​the air inlet is larger than the cross-sectional area of ​​the air outlet.

[0033] Beneficial effects: When flue gas enters the heat exchange zone from the inlet, the large inlet area allows the flue gas to flow in smoothly and quickly, accelerating its entry into the heat exchange zone. Conversely, when the flue gas flows from the heat exchange zone to the outlet, the relatively small outlet area restricts its flow, slowing its exit speed and prolonging its residence time within the heat exchange zone. This increased residence time effectively enhances the contact time and area between the flue gas and the heat exchange tubes, creating more opportunities for contact and heat exchange. This contributes to more efficient heat transfer and improves the overall heat exchange efficiency of the heat exchanger.

[0034] Secondly, this utility model also provides a gas water heater, including the heat exchanger described above. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a front view of a heat exchanger according to an embodiment of the present utility model;

[0037] Figure 2 This is a schematic diagram of the heat exchanger from another perspective of an embodiment of the present utility model;

[0038] Figure 3 This is an exploded view of the heat exchanger according to an embodiment of the present invention;

[0039] Figure 4 This is a bottom view of the heat exchanger according to an embodiment of the present utility model;

[0040] Figure 5 This is a side view of the heat exchanger according to an embodiment of the present utility model;

[0041] Figure 6 This is a top view of the heat exchanger according to an embodiment of the present utility model;

[0042] Figure 7 for Figure 6 The sectional view of BB in the image.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Shell;

[0045] 11. Heat exchange zone; 12. Air outlet; 13. Air inlet;

[0046] 2. Heat exchanger tubes;

[0047] 21. Inlet pipe; 22. Return pipe;

[0048] 3. Cold water inlet pipe;

[0049] 4. Hot water outlet pipe;

[0050] 5. Commutating pipe;

[0051] 51. First connecting pipe; 52. Second connecting pipe; 53. Third connecting pipe;

[0052] 6. First connecting tube;

[0053] 7. Second connecting tube. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0055] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0058] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0059] According to an embodiment of this utility model, a heat exchanger is provided, including a shell 1, multiple heat exchange tubes 2, a cold water inlet pipe 3, and a hot water outlet pipe 4. The shell 1 has a heat exchange zone 11 inside, with an outlet 12 at one end along a first direction and an inlet 13 at the other end along the first direction, the inlet 13 being used to communicate with a burner. Multiple heat exchange tubes 2 are sequentially arranged within the heat exchange zone 11 along a second direction. The multiple heat exchange tubes 2 are connected in parallel with the cold water inlet pipe 3; the multiple heat exchange tubes 2 are also connected in parallel with the hot water outlet pipe 4. The cold water in the multiple heat exchange tubes 2 undergoes sufficient heat exchange with the high-temperature flue gas within the heat exchange zone 11, and after heat exchange, it converges and flows out through the hot water outlet pipe 4. The first direction is perpendicular to the second direction.

[0060] In the above embodiment, by setting multiple heat exchange tubes 2 arranged along the second direction within the heat exchange zone 11, cold water flows in from the cold water inlet pipe 3 and is then distributed to each heat exchange tube 2. Since the flue gas flows through the heat exchange zone 11 in the first direction, and the first direction is perpendicular to the second direction, it is ensured that the flue gas can directly and fully wash the outer surface of each heat exchange tube 2. The multiple heat exchange tubes 2 arranged along the second direction divide the cold water into multiple independent branches, allowing it to simultaneously and over a large area directly contact the high-temperature flue gas, significantly increasing the effective heat exchange area and heat exchange opportunities, and achieving efficient recovery and full utilization of flue gas heat; therefore, the technical problem of low heat exchange rate of the heat exchanger, resulting in serious waste of flue gas heat, is solved.

[0061] Specifically, since current gas water heaters generally adopt a finned design, adding fins to the heat exchange tube 2 effectively increases the heat exchange area, thereby improving heat exchange efficiency. However, the increase in fins increases the weight of the heat exchanger, making the overall equipment bulky, which brings great inconvenience to installation and transportation. The manufacturing process of fins is complex, with high material costs and processing costs. The thickness of the fins is about 0.1mm, and a gas water heater's heat exchanger is usually composed of up to 150 fins. Due to the dense distribution of fins, the actual flue gas passage becomes relatively narrow. Moreover, dust in the air easily accumulates on the fin surface, further compressing the flue gas passage. This blockage leads to insufficient heat exchange of the flue gas, ultimately resulting in a higher temperature of the discharged flue gas. At the same time, the maintenance of the heat exchanger is also more difficult due to this complex structure. Furthermore, during long-term operation, the fins may deform or even fall off due to thermal expansion and vibration, which will undoubtedly affect the service life of the heat exchanger. The design of multiple parallel heat exchange tubes 2 in this application not only effectively increases the heat exchange area and improves the heat exchange efficiency, but also reduces the overall weight of the equipment, simplifies the processing technology, reduces manufacturing costs, and makes cleaning and maintenance more convenient.

[0062] Specifically, both the air inlet 13 and the air outlet 12 are connected to the heat exchange zone 11; the air outlet 12 is connected to the fan, and the flue gas generated by the burner enters the heat exchange zone 11 through the air inlet 13, and the flue gas entering the heat exchange zone 11 is drawn out by the fan through the air outlet 12.

[0063] Specifically, heat exchange tube 2 is a copper tube.

[0064] Specifically, there is no limit to the number of heat exchange tubes 2; two, four, or six heat exchange tubes 2 can be installed.

[0065] In one embodiment, both the cold water inlet pipe 3 and the hot water outlet pipe 4 are located on one side of the housing 1 along a third direction; and the third direction is provided with an angle between it and the first direction and the second direction; the third direction is the extension direction of the heat exchange pipe 2; the heat exchange pipe 2 includes an inlet pipe 21 and a return pipe 22; the inlet pipe 21 is connected to the cold water inlet pipe 3; one end of the return pipe 22 is connected to the end of the inlet pipe 21 away from the cold water inlet pipe 3, and the other end is connected to the hot water outlet pipe 4.

[0066] In the above embodiment, since the cold water inlet pipe 3 and the hot water outlet pipe 4 are located on the same side of the shell 1, and the heat exchange tube 2 adopts a structure in which the inlet pipe 21 is connected to the cold water inlet pipe 3, and the two ends of the return pipe 22 are connected to the inlet pipe 21 and the hot water outlet pipe 4 respectively, cold water enters the heat exchange tube 2 from the cold water inlet pipe 3 through the inlet pipe 21, undergoes heat exchange in the heat exchange zone 11, and then flows back and forth at least once through the return pipe 22, finally being discharged through the hot water outlet pipe 4. During the round trip, it is ensured that the cold water has a more sufficient flow time and a longer heat exchange path in the heat exchange zone 11, and can fully contact the flue gas, thereby more effectively absorbing the waste heat of the flue gas and improving the waste heat recovery efficiency of the flue gas. Furthermore, by setting both the cold water inlet pipe 3 and the hot water outlet pipe 4 on one side of the shell 1 along the third direction, the pipe connection of the heat exchanger is more concentrated and compact, which facilitates installation and maintenance.

[0067] In one embodiment, the water inlet pipe 21 is a spiral pipe extending spirally along the third direction.

[0068] In the above embodiment, by setting the water inlet pipe 21 as a spiral pipe, the spiral structure significantly increases the effective length and total heat exchange area of ​​the water inlet pipe 21 within a limited space. This allows the cold water to have more sufficient heat exchange contact with the surrounding environment when flowing inside the water inlet pipe 21, prolonging the contact time between the cold water and the high-temperature flue gas, and making heat absorption more complete. Furthermore, the spiral structure can transform the water flow into turbulent flow, effectively disrupting the laminar boundary layer near the pipe wall, increasing the convective heat transfer coefficient between the fluid and the pipe wall, making heat transfer more efficient, effectively improving heat exchange efficiency, and maximizing the efficiency of flue gas heat recovery within a compact space.

[0069] Specifically, the diameter of the spiral tube is 60 mm.

[0070] In one embodiment, the inlet pipe 21 is arranged around the outer periphery of the corresponding return pipe 22.

[0071] In the above embodiment, by arranging the inlet pipe 21 around the outer periphery of the corresponding return pipe 22, the internal spatial structure of the heat exchanger is optimized. This achieves efficient integration of the inlet pipe 21 and return pipe 22 within a limited space, avoiding cluttered pipe arrangements and making the overall layout of the device more compact and rational, saving space. Furthermore, since the return pipe 22 carries a fluid with a relatively high temperature after heat exchange, there is usable residual heat around it. The arrangement of the inlet pipe 21 around the outer periphery of the return pipe 22 allows the cold water in the inlet pipe 21 to absorb this residual heat more directly and efficiently, extending the contact time and contact area between the cold water and the residual heat, thereby significantly improving heat exchange efficiency. This allows the cold water to heat up faster, improving the energy utilization rate of the entire heat exchange process. Moreover, the outer inlet pipe 21 acts as a heat shield layer, significantly reducing heat loss from the inner return pipe 22, effectively suppressing the temperature drop of the hot water in the return pipe 22 during flow, and ensuring the temperature of the hot water flowing into the hot water outlet pipe 4.

[0072] In specific implementation methods, such as Figure 4 As shown, adjacent spiral tubes are arranged in an interlaced manner to form intersections, which maximizes space utilization and ensures the compactness of the entire structure.

[0073] In one embodiment, the return water pipe 22 is a straight pipe extending in a straight line along the third direction.

[0074] In the above embodiment, the straight pipe extends in a straight line, minimizing the resistance of water flow within the return pipe 22. When hot water flows within the return pipe 22, there is no additional energy loss due to pipe bends or turns, resulting in smoother and more stable water flow. This achieves the shortest path for hot water output, minimizing heat loss during transport and ensuring efficient flow of hot water from the return pipe 22 to the hot water outlet pipe 4, thus improving water transport efficiency. Furthermore, the straight pipe structure eliminates the need for complex bending and connecting operations during installation, significantly reducing installation difficulty and time costs, improving installation efficiency, facilitating inspection and maintenance, reducing the complexity and workload of maintenance work, and lowering maintenance costs.

[0075] Specifically, the diameter of the straight pipe is 16mm.

[0076] In one embodiment, a reversing pipe 5 is also included, which is disposed on the other side of the housing 1 along the third direction and is connected to both the inlet pipe 21 and the return pipe 22.

[0077] In the above embodiment, by setting a reversing pipe 5 to connect the end of the inlet pipe 21 and the beginning of the return pipe 22, the fluid can smoothly change its flow direction through the reversing pipe 5 after completing the flow in the inlet pipe 21, and transition from the inlet pipe 21 to the return pipe 22, thereby completing the reversing operation of the fluid between the inlet pipe 21 and the return pipe 22.

[0078] In one embodiment, the reversing pipe 5 includes a first connecting pipe 51, a second connecting pipe 52, and a third connecting pipe 53; the first connecting pipe 51 extends along the second direction and is connected in parallel with multiple water inlet pipes 21; the second connecting pipe 52 is spaced apart from the first connecting pipe 51 along the first direction, and the second connecting pipe 52 extends along the second direction and is connected to multiple water return pipes 22; the two ends of the third connecting pipe 53 are respectively connected to the first connecting pipe 51 and the second connecting pipe 52.

[0079] In the above embodiment, the first connecting pipe 51 extends along the second direction and is connected in parallel with multiple inlet pipes 21, which can efficiently and evenly integrate and converge the water flow from the multiple inlet pipes 21. The second connecting pipe 52 extends along the second direction and is connected with multiple return pipes 22, which can ensure that the water flow can be diverted to the multiple return pipes 22; and since the first connecting pipe 51 and the second connecting pipe 52 both extend parallel to each other along the second direction and are spaced apart, and the two ends of the third connecting pipe 53 are connected to the first connecting pipe 51 and the second connecting pipe 52 respectively, a complete and smooth fluid diversion channel is formed, which can ensure that the water flow smoothly transitions from the first connecting pipe 51 to the second connecting pipe 52, and the pipeline route is clear and orderly.

[0080] In some embodiments, the third connecting pipe 53 is connected to the ends of the first connecting pipe 51 and the second connecting pipe 52.

[0081] In some embodiments, multiple inlet pipes 21 are evenly arranged and connected along the first connecting pipe 51, and multiple return pipes 22 are evenly arranged and connected along the second connecting pipe 52; a third connecting pipe 53 is connected at the midpoint between the first connecting pipe 51 and the second connecting pipe 52. This ensures that the multiple inlet pipes 21 and multiple return pipes 22 are evenly and symmetrically distributed on both sides of the third connecting pipe 53, guaranteeing uniform fluid distribution and balanced flow.

[0082] In one embodiment, a first connecting pipe 6 is also included. The first connecting pipe 6 is disposed on the outside of the housing 1, extends along the second direction, and is connected to the plurality of water inlet pipes 21 and the cold water inlet pipe 3.

[0083] In the above embodiments, by placing the first connecting pipe 6 on the outside of the housing 1, the space outside the housing 1 is utilized, avoiding the congestion and interference caused by arranging too many pipes in the limited space inside the housing 1. This makes the internal structure of the housing 1 more compact and orderly. It also facilitates connection with an external cold water source, reducing the difficulty and cost of installation and maintenance, and improving the efficiency of installation and maintenance. Furthermore, the first connecting pipe 6 is simultaneously connected to multiple water inlet pipes 21 and cold water inlet pipes 3, realizing centralized distribution of cold water source. Since the first connecting pipe 6 extends along the second direction, it provides a stable flow path for cold water after entering from the cold water inlet pipe 3, which can evenly and efficiently distribute cold water to multiple water inlet pipes 21, ensuring that each water inlet pipe 21 receives a sufficient and balanced supply of cold water.

[0084] In some embodiments, the cold water inlet pipe 3 is connected to the end of the first connecting pipe 6.

[0085] In some embodiments, multiple inlet pipes 21 are evenly arranged and connected along the first connecting pipe 6; the cold water inlet pipe 3 is connected in the middle of the first connecting pipe 6, ensuring that the cold water entering the inlet pipe 21 can be evenly distributed to both sides along the pipe body of the first connecting pipe 6, ultimately ensuring that the cold water flow distribution into each inlet pipe 21 is more uniform, avoiding the problem of some inlet pipes 21 having excessive flow and some inlet pipes 21 having insufficient flow due to uneven cold water distribution, providing good conditions for subsequent heat exchange operations, and helping to improve the heat exchange efficiency and working stability of the entire heat exchanger.

[0086] In one embodiment, a second connecting pipe 7 is also included. The second connecting pipe 7 is disposed on the outside of the housing 1, extends along the second direction, and is connected to the plurality of return water pipes 22 and the hot water outlet pipe 4.

[0087] In the above embodiment, by placing the second connecting pipe 7 on the outside of the housing 1, the space outside the housing 1 is utilized, avoiding the congestion and interference caused by arranging too many pipes in the limited space inside the housing 1. This makes the internal structure of the housing 1 more compact and orderly. It also facilitates the connection with the hot water outlet pipe 4, reduces the difficulty and cost of installation and maintenance, and improves the efficiency of installation and maintenance. Since the second connecting pipe 7 extends along the second direction and connects with multiple return water pipes 22 and the hot water outlet pipe 4, it provides a smooth collection channel for the hot water in the return water pipes 22. It can efficiently and evenly collect the hot water in multiple return water pipes 22 and then centrally transport it to the hot water outlet pipe 4. This ensures that the hot water can flow out stably and orderly, avoids pressure fluctuations and water flow disturbances caused by poor collection of hot water in the return water pipes 22, and ensures the stability and continuity of hot water output.

[0088] In some embodiments, the hot water outlet pipe 4 is connected to the end of the second connecting pipe 7.

[0089] In some embodiments, multiple return water pipes 22 are evenly arranged and connected along the second connecting pipe 7; the hot water outlet pipe 4 is connected to the middle position of the first connecting pipe 6, so that the hot water collected from each return water pipe 22 can be more evenly gathered to the hot water outlet pipe 4, thereby ensuring that the hot water can be stably and evenly discharged from the hot water outlet pipe 4, and avoiding problems such as local pressure fluctuations and flow differences caused by uneven hot water collection.

[0090] In one embodiment, the cross-sectional area of ​​the air inlet 13 is larger than the cross-sectional area of ​​the air outlet 12.

[0091] In the above embodiment, when the flue gas enters the heat exchange zone 11 from the inlet 13, the flue gas can flow in smoothly and quickly due to the large inlet area, which speeds up the entry of the flue gas into the heat exchange zone 11. However, when the flue gas flows from the heat exchange zone 11 to the outlet 12, the flue gas flow is somewhat restricted due to the relatively small outlet area, and the speed of the flue gas flowing out of the heat exchange zone 11 slows down, thus prolonging the residence time of the flue gas in the heat exchange zone 11. As the residence time of the flue gas in the heat exchange zone 11 increases, the contact time and contact area between the flue gas and the heat exchange tube 2 are effectively improved, thereby creating more sufficient contact and heat exchange opportunities between the flue gas and the heat exchange tube 2, which helps to achieve heat transfer more efficiently and improve the overall heat exchange efficiency of the heat exchanger.

[0092] In some embodiments, the housing 1 includes a top plate and four side plates; the four side plates are connected end to end in sequence, and the top plate is fixed to one side of the four side plates along a first direction, forming a heat exchange zone 11 with the four side plates. An air outlet 12 is disposed on the top plate, and an air inlet 13 is disposed opposite to the air outlet 12. An opening on the other side of the housing 1 along the first direction serves as the air inlet 13.

[0093] In some embodiments, such as Figure 3 As shown, the heat exchange tube 2 extends along a third direction, and the third direction is perpendicular to both the first and second directions. A side plate along the third direction is designated as the first side plate, with a first through hole and a second through hole. The inlet pipe 21 is connected to the first connecting pipe 51 through the first through hole. The return pipe 22 is connected to the second connecting pipe 52 through the second through hole. A side plate along the other side of the third direction is designated as the second side plate, with a third through hole and a fourth through hole. The inlet pipe 21 is connected to the first connecting pipe 6 through the third through hole. The return pipe 22 is connected to the second connecting pipe 7 through the fourth through hole.

[0094] In a specific implementation, high-temperature flue gas enters the heat exchange zone 11 through the inlet 13, and after sufficient heat exchange with the heat exchange tube 2, it is drawn out by the fan from the outlet 12. Cold water enters the first connecting pipe 6 through the cold water inlet pipe 3, and is diverted through the first connecting pipe 6 to multiple water inlet pipes 21 to exchange heat with the high-temperature flue gas. Then, after being diverted through the reversing pipe 5, it is diverted to multiple return water pipes 22 and re-enters the heat exchange zone 11 to exchange heat with the high-temperature flue gas, further absorbing the waste heat of the flue gas. Then, the hot water in the multiple return water pipes 22 flows into the second connecting pipe 7, and after being integrated and converged through the second connecting pipe 7, it flows into the hot water outlet pipe 4, and finally flows out from the hot water outlet pipe 4.

[0095] According to an embodiment of the present invention, another aspect provides a gas water heater including the heat exchanger described above.

[0096] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A heat exchanger, characterized in that, include: The shell (1) has a heat exchange zone (11) inside, an air outlet (12) at one end along the first direction, and an air inlet (13) at the other end along the first direction. The air inlet (13) is used to communicate with the burner. Multiple heat exchange tubes (2) are arranged sequentially in the heat exchange zone (11) along the second direction; A cold water inlet pipe (3) is provided, and multiple heat exchange tubes (2) are connected in parallel with the cold water inlet pipe (3); Hot water outlet pipe (4), and multiple heat exchange pipes (2) are connected in parallel with the hot water outlet pipe (4); Wherein, the first direction is perpendicular to the second direction.

2. The heat exchanger according to claim 1, characterized in that, The cold water inlet pipe (3) and the hot water outlet pipe (4) are both located on one side of the shell (1) along a third direction; the third direction is the extension direction of the heat exchange tube (2); and the third direction has an angle with both the first direction and the second direction; the heat exchange tube (2) includes: Water inlet pipe (21) is connected to the cold water inlet pipe (3); The return water pipe (22) is connected at one end to the end of the inlet pipe (21) away from the cold water inlet pipe (3), and at the other end to the hot water outlet pipe (4).

3. The heat exchanger according to claim 2, characterized in that, The water inlet pipe (21) is a spiral pipe that extends spirally along the third direction.

4. The heat exchanger according to claim 3, characterized in that, The inlet pipe (21) is arranged around the outer periphery of the corresponding return pipe (22).

5. The heat exchanger according to claim 2, characterized in that, The return water pipe (22) is a straight pipe extending in a straight line along the third direction.

6. The heat exchanger according to any one of claims 2 to 5, characterized in that, It also includes a reversing pipe (5), which is disposed on the other side of the housing (1) along the third direction and is connected to both the water inlet pipe (21) and the water return pipe (22).

7. The heat exchanger according to claim 6, characterized in that, The commutator (5) includes: The first connecting pipe (51) extends along the second direction and is connected in parallel with the plurality of water inlet pipes (21); The second connecting pipe (52) is spaced apart from the first connecting pipe (51) along the first direction. The second connecting pipe (52) extends along the second direction and is connected to the plurality of return water pipes (22). The third connecting pipe (53) is connected at both ends to the first connecting pipe (51) and the second connecting pipe (52), respectively.

8. The heat exchanger according to any one of claims 2 to 5 or 7, characterized in that, It also includes a first connecting pipe (6), which is disposed on the outside of the housing (1), extends along the second direction, and is connected to the multiple water inlet pipes (21) and the cold water inlet pipe (3).

9. The heat exchanger according to any one of claims 2 to 5 or 7, characterized in that, It also includes a second connecting pipe (7), which is disposed on the outside of the housing (1), extends along the second direction, and is connected to the multiple return water pipes (22) and the hot water outlet pipe (4).

10. The heat exchanger according to any one of claims 1 to 5 or 7, characterized in that, The cross-sectional area of ​​the air inlet (13) is larger than the cross-sectional area of ​​the air outlet (12).

11. A gas water heater, characterized in that, The heat exchanger includes any one of claims 1 to 10.

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