Five-pipe main heat exchanger with water box structure and energy-saving water heater

Abstract

The utility model discloses a five-pipe main heat exchanger with a water box structure and an energy-saving water heater, the main heat exchanger comprises a heat exchange main body, the water box structure and a plurality of silencing pieces, the heat exchange main body comprises heat exchange pipes and fins, each silencing piece comprises a body part, a plurality of first turbulent flow parts and a plurality of second turbulent flow parts, a plurality of silencing holes are evenly distributed in the body part in the length direction, and the first turbulent flow part and the second turbulent flow part are arranged in a staggered mode so that Y-shaped turbulent flow structures can be formed on the two opposite sides of the body part respectively. The water box structure of the main heat exchanger can reduce pipeline resistance and reduce air resistance, the Y-shaped turbulent flow structures of the silencing pieces can prolong the retention time of fluid in a pipeline, increase the contact frequency of the fluid and the pipe wall, fully absorb heat, improve heat transfer efficiency and prevent boiling noise caused by local overheating or low temperature, and the service life of the main heat exchanger is prolonged. Fatigue damage caused by thermal stress of the heat exchanger is reduced, and reflection of sound waves can be dispersed and destroyed in cooperation with a structure formed by the silencing holes, so that the noise level is lowered.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a five-tube main heat exchanger with a water box structure and an energy-saving hot water boiler. Background Technology

[0002] The main heat exchanger is primarily made of copper, though stainless steel is also sometimes used. It is a crucial component of gas-fired heating and hot water boilers, transferring heat to the heating system or bathroom water system to meet indoor heating or hot water needs. Typically, the main heat exchanger consists of a set of pipes and heat-absorbing fins. The pipes connect the heat exchanger to the heating system or bathroom water system, while the heat-absorbing fins are fitted onto the pipes and positioned above the burner. By absorbing heat from the high-temperature flue gas, they transfer the heat to the hot water within the pipes. The reheated hot water is then delivered to the heating system, or, via the heat exchanger, transferred to the bathroom water system on one side of the heat exchanger.

[0003] In existing technologies, the main heat exchanger includes a main body and a turbulence section installed inside the main body. The turbulence section helps to achieve better heat exchange between the system water and the main body. However, the flow of system water within the main body generates significant flow noise, which cannot be solved by ordinary turbulence sections. In addition, the main heat exchanger adopts a single-tube series structure, where straight tubes at both ends of the heat exchanger are connected by U-shaped tubes to form a hot water exchange circuit. However, this type of structure has complex manufacturing processes, high processing costs, tortuous pipes, and high system resistance. At the same time, the U-shaped tube interface requires high dimensional accuracy and high tube expansion technology, and there are many joints that need to be welded, resulting in a high risk of water leakage at the joints and a high product defect rate. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a five-tube main heat exchanger with a water box structure to solve the above-mentioned traditional problems.

[0005] The second objective of this utility model is to provide an energy-saving hot water boiler that uses the five-tube main heat exchanger with a water box structure.

[0006] One of the objectives of this utility model is achieved through the following technical solution:

[0007] A five-tube main heat exchanger with a water box structure includes a heat exchange body, water box structures sleeved at opposite ends of the heat exchange body, and multiple sound-absorbing plates installed inside the heat exchange body. The heat exchange body includes multiple heat exchange tubes and multiple fins. Each heat exchange tube is sequentially connected through the water box structure to form a water flow channel. Each fin is spaced along the length of the heat exchange tube and separates the heat exchange tubes to form a flue gas flow channel. Each sound-absorbing plate includes a main body, multiple first turbulence portions and multiple second turbulence portions extending outward from opposite sides of the main body. The main body has multiple sound-absorbing holes evenly distributed along its length. The first turbulence portions and the second turbulence portions are staggered to form Y-shaped turbulence structures on opposite sides of the main body.

[0008] Preferably, the angle formed by the first and second turbulence portions is 80°-110°.

[0009] Preferably, the angle formed by the first and second turbulence portions is 90°.

[0010] Preferably, the silencing hole is one or more of the following: square hole, round hole, and triangular hole.

[0011] Preferably, one side of the fin is provided with a flange mounting hole, a turbulence protrusion, a folded edge, and a welding rod hole. The flange mounting hole is used for the heat exchange tube to pass through. The turbulence protrusion is located between two adjacent flange mounting holes. The folded edge is located at opposite ends of the fin. The welding rod hole is located at the top of the flange mounting hole.

[0012] Preferably, the turbulence protrusion has an inverted triangular structure; the folded edge is strip-shaped; and the welding rod hole is semi-circular.

[0013] Preferably, the flange width of the flange mounting hole is greater than the protrusion width of the turbulence protrusion; the flange width of the folded edge is greater than the flange width of the flange mounting hole.

[0014] Preferably, the water box structure includes a water box base plate and a water box top cover that is sealed to the water box base plate. The water box base plate is provided with mounting holes for interference fit with heat exchange tubes. The end of the mounting hole facing away from the heat exchange tube is provided with a sleeve flange. The water box top cover is provided with multiple connecting protrusions, a water inlet protrusion, and a water outlet protrusion. Each of the connecting protrusions is used to connect adjacent heat exchange tubes to form a water flow channel. The water inlet protrusion is equipped with a water inlet connector, and the water outlet protrusion is equipped with a water outlet connector.

[0015] Preferably, the bottom plate of the water box has a peripheral flange, the connecting protrusion is a square structure, the water inlet protrusion is an elliptical structure, the water outlet protrusion is an elliptical structure, the water inlet protrusion has a first flanged round hole, and the water outlet protrusion has a second flanged round hole.

[0016] The second objective of this utility model is achieved by the following technical solution:

[0017] An energy-saving hot water boiler includes the five-tube main heat exchanger with a water box structure as described above.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The five-tube main heat exchanger of this utility model, through the cooperation of the heat exchange body, water box structure and sound-absorbing plate, etc., the water box structure can reduce pipe resistance and reduce air resistance formation, the Y-shaped turbulence structure of the sound-absorbing plate can prolong the residence time of fluid in the pipe, increase the contact frequency with the pipe wall, fully absorb heat, improve heat transfer efficiency, prevent local overheating or low temperature from causing boiling noise, reduce fatigue damage caused by thermal stress of the heat exchanger, and the structure formed by the sound-absorbing holes can disperse and destroy the reflection of sound waves, thereby achieving the goal of reducing noise level.

[0020] 2. The five-tube main heat exchanger of this utility model connects the heat exchange tubes through the water box bottom plate and the water box top cover, replacing the existing heat exchanger structure that uses a U-shaped tube structure for connection. This reduces pipe resistance and reduces water leakage problems caused by poor welding. It optimizes the assembly method of single-channel heat exchangers. Using a water box structure instead of a U-shaped tube can reduce welding joints, reduce the risk of water leakage and the failure rate of heat exchangers. In addition, the water box has better sealing performance and is simpler to assemble, which can effectively reduce processing time and processing costs. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the five-tube main heat exchanger of this utility model;

[0022] Figure 2 for Figure 1 An exploded view of the five-tube main heat exchanger shown;

[0023] Figure 3 for Figure 2 A cross-sectional view of the water box structure shown;

[0024] Figure 4 for Figure 2 A cross-sectional view of the water inlet connector shown;

[0025] Figure 5 for Figure 2 A schematic diagram of the front structure of the fins shown;

[0026] Figure 6 for Figure 5 A top view of the fins shown;

[0027] Figure 7 for Figure 2 A schematic diagram of the three-dimensional structure of the sound-absorbing sheet is shown;

[0028] Figure 8 for Figure 7 The side view of the sound-absorbing sheet shown.

[0029] In the diagram: 10. Heat exchanger body; 11. Heat exchanger tube; 12. Fin; 120. Flanged mounting hole; 121. Turbulence protrusion; 122. Folded edge; 123. Welding rod hole; 20. Water box structure; 21. Water box bottom plate; 22. Water box top cover; 220. Connecting protrusion; 221. Water inlet protrusion; 222. Water outlet protrusion; 223. Water inlet connector; 224. Water outlet connector; 30. Silencing plate; 31. Body part; 32. First turbulence part; 33. Second turbulence part; 34. Silencing hole. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In the description of this utility model, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0033] Please see Figures 1-8This invention relates to a preferred embodiment of a five-tube main heat exchanger with a water box structure 20, used in a gas-fired heating hot water boiler or an energy-saving hot water boiler to improve the heat exchange effect of the system water during combustion and reduce the noise generated by the water flow in the main heat exchanger. Specifically, the five-tube main heat exchanger includes a heat exchange body 10, water box structures 20 sleeved at opposite ends of the heat exchange body 10, and multiple sound-absorbing plates 30 installed inside the heat exchange body 10. The heat exchange body 10 includes multiple heat exchange tubes 11 and multiple fins 12. Each heat exchange tube 11 is sequentially connected through the water box structure 20 to form a water flow channel to reduce pipe resistance and reduce air resistance. Each fin 12 is spaced along the length of the heat exchange tube 11 and separates the heat exchange tubes 11 to form a flue gas flow channel, allowing the high temperature to be absorbed. The flue gas flows out after exchanging heat with the water flow along the flue gas flow channel. The sound-absorbing plate 30 includes a main body 31, a plurality of first turbulence-inducing parts 32 and a plurality of second turbulence-inducing parts 33 extending outward from opposite sides of the main body 31. The main body 31 has a plurality of sound-absorbing holes 34 evenly distributed along its length. The first turbulence-inducing parts 32 and the second turbulence-inducing parts 33 are staggered to form Y-shaped turbulence structures on opposite sides of the main body 31. The staggered Y-shaped turbulence structure can prolong the residence time of the fluid in the pipe, increase the contact frequency with the pipe wall, fully absorb heat, improve heat transfer efficiency, prevent local overheating or low temperature from causing boiling noise, and reduce fatigue damage caused by thermal stress of the heat exchanger. At the same time, the structure formed by the Y-shaped turbulence structure and the sound-absorbing holes 34 can disperse and destroy the reflection of sound waves, thereby reducing the noise level.

[0034] In this embodiment, the angle formed by the first turbulence-disrupting part 32 and the second turbulence-disrupting part 33 is 80°-110°, such as 80°, 90°, 100°, 110°, etc. Preferably, the angle formed by the first turbulence-disrupting part 32 and the second turbulence-disrupting part 33 is 90°. Their length is matched with the structure of the heat exchange tube 11 so that they can abut against the heat exchange tube 11, facilitating the heat transfer of the heat from the heat exchange tube 11 through the silencing plate 30. In one embodiment, on the same side, the first turbulence-disrupting part 32 and the second turbulence-disrupting part 33 are staggered. On opposite sides (i.e., at the relative positions of the upper and lower sides of the silencing plate 30), the upper end of the main body 31 is the first turbulence-disrupting part 32, and the lower end of the main body 31 is the second turbulence-disrupting part 33. That is, the orientation of the turbulence-disrupting parts at the relative positions of the upper and lower sides is different, so as to form a staggered structure, which makes its turbulence and silencing effect better.

[0035] Optionally, the silencing hole 34 is generally one or more of the following: square hole, round hole, and triangular hole. Preferably, the silencing hole 34 is a square hole to facilitate the flow of water on both sides.

[0036] In one embodiment, the heat exchange tube 11 is at least one of an elliptical tube, a flat tube, or a shaped tube. Under the same flow rate, these tube types have a larger contact area with the hot airflow as the hot airflow moves upward. In this embodiment, the heat exchange tube 11 is an elliptical tube.

[0037] The fin 12 is formed by stamping a thin metal sheet using a die. One side of the fin 12 has a flanged mounting hole 120, a turbulence-inducing protrusion 121, a folded edge 122, and a welding rod hole 123. The flanged mounting hole 120 is for the heat exchange tube 11 to pass through, facilitating better contact with the fin 12 for heat exchange. The turbulence-inducing protrusion 121 is located between two adjacent flanged mounting holes 120. The turbulence-inducing protrusion 121 has a roughly inverted triangular structure to cooperate with the flanged mounting hole 120, folded edge 122, and other structures to turbulent the airflow and reduce heat loss. The flue gas flow velocity is slowed down, the heat exchange area is increased, and the heat transfer effect is improved. Folded edges 122 are located at opposite ends of the fins 12. The folded edges 122 are strip-shaped, forming a relatively sealed flue gas flow channel. Welding rod holes 123 are located at the top of the flange mounting holes 120. The welding rod holes 123 are semi-circular and are used to pass welding rods through. During brazing, the welding rods melt and flow evenly along the elliptical tube to weld with the fins 12, thus fixing the fins 12 to the heat exchange tube 11. In this embodiment, as... Figure 6 As shown, the flange width of the flange mounting hole 120 is greater than the protrusion width of the turbulence protrusion 121, so that some of the flue gas can flow out from the surface of the turbulence protrusion 121 to increase the heat exchange area of ​​the fin 12. The flange width of the folded edge 122 is greater than the flange width of the flange mounting hole 120.

[0038] like Figures 2-4As shown, the water box structure 20 includes a water box base plate 21 and a water box top cover 22 that is sealed to the water box base plate 21. The water box base plate 21 is provided with mounting holes for interference fit with the heat exchange tubes 11. The end of the mounting hole facing away from the heat exchange tubes 11 is provided with a sleeve flange. The water box top cover 22 is provided with multiple connecting protrusions 220, a water inlet protrusion 221 and a water outlet protrusion 222. Each connecting protrusion 220 is used to connect adjacent heat exchange tubes 11 to form a water flow channel. The water inlet protrusion 221 is equipped with a water inlet connector 223, and the water outlet protrusion 222 is equipped with a water outlet connector 224. Its assembly is simple. Replacing the U-shaped tube can reduce welding joints, reduce the risk of water leakage and reduce the defect rate of heat exchanger products. Furthermore, through the action of solder paste and welding ring, the water box has better sealing performance, which can effectively reduce processing costs and shorten the delivery cycle. In this embodiment, the water box bottom plate 21 has a peripheral flange to facilitate pressing with the four sides of the water box top cover 22 to form a sealed cavity. The connecting protrusion 220 is roughly square, the inlet protrusion 221 is roughly elliptical, and the outlet protrusion 222 is roughly elliptical. The inlet protrusion 221 has a first flanged circular hole, and the outlet protrusion 222 has a second flanged circular hole to facilitate coaxial interference fit installation with the inlet and outlet water connectors, followed by welding for sealing. The inlet and outlet water connectors are formed from copper pipes through processes such as bending, expanding, and pressing the flanged steps. The large cylindrical channel of the inlet and outlet water connector is used to install the inlet and outlet water pipes, and an O-ring is used to form a seal. The large cylindrical step is used to fix the connection between the main valve and the inlet and outlet water pipes with clips. The small cylindrical channel is used to connect the circular flanged hole of the water box, and the step is used for positioning and limiting.

[0039] In another embodiment, the five-tube main heat exchanger can be made of copper or stainless steel, preferably stainless steel.

[0040] This utility model also provides an energy-saving hot water heater according to a specific embodiment, which includes the five-tube main heat exchanger of any of the above specific embodiments. Because the five-tube main heat exchanger has technical effects such as reducing water flow noise, reducing pipe resistance, improving heat exchange efficiency, improving reliability, reducing product defect rate, and reducing the probability of pipe blockage, this energy-saving hot water heater can also achieve the above technical effects.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A five-tube main heat exchanger with a water box structure, characterized in that, The device includes a heat exchange body, water box structures fitted at opposite ends of the heat exchange body, and multiple silencing plates installed within the heat exchange body. The heat exchange body includes multiple heat exchange tubes and multiple fins. Each heat exchange tube is sequentially connected through the water box structure to form a water flow channel. Each fin is spaced along the length of the heat exchange tube and is fitted onto the heat exchange tube at intervals, separating the heat exchange tubes to form a flue gas flow channel. Each silencing plate includes a main body, multiple first turbulence portions and multiple second turbulence portions extending outward from opposite sides of the main body. The main body has multiple silencing holes evenly distributed along its length. The first and second turbulence portions are staggered to form Y-shaped turbulence structures on opposite sides of the main body.

2. The five-tube main heat exchanger with a water box structure according to claim 1, characterized in that, The angle formed by the first and second turbulence parts is 80°-110°.

3. The five-tube main heat exchanger with a water box structure according to claim 2, characterized in that, The angle formed by the first and second turbulence portions is 90°.

4. The five-tube main heat exchanger with a water box structure according to claim 1, characterized in that, The silencing hole is one or more of the following: square hole, round hole, and triangular hole.

5. The five-tube main heat exchanger with a water box structure according to claim 1, characterized in that, One side of the fin is provided with a flange mounting hole, a turbulence protrusion, a folded edge, and a welding rod hole. The flange mounting hole is used for the heat exchange tube to pass through. The turbulence protrusion is located between two adjacent flange mounting holes. The folded edge is located at opposite ends of the fin. The welding rod hole is located at the top of the flange mounting hole.

6. The five-tube main heat exchanger with a water box structure according to claim 5, characterized in that, The turbulence protrusion has an inverted triangular structure; the folded edge is strip-shaped; and the welding rod hole is semi-circular.

7. The five-tube main heat exchanger with a water box structure according to claim 5, characterized in that, The flange width of the flange mounting hole is greater than the protrusion width of the turbulence protrusion; the flange width of the folded edge is greater than the flange width of the flange mounting hole.

8. The five-tube main heat exchanger with a water box structure according to claim 1, characterized in that, The water box structure includes a water box base plate and a water box top cover that is sealed to the water box base plate. The water box base plate is provided with mounting holes for interference fit with heat exchange tubes. The end of the mounting hole facing away from the heat exchange tube is provided with a sleeve flange. The water box top cover is provided with multiple connecting protrusions, water inlet protrusions and water outlet protrusions. Each of the connecting protrusions is used to connect adjacent heat exchange tubes to form a water flow channel. The water inlet protrusion is equipped with a water inlet connector, and the water outlet protrusion is equipped with a water outlet connector.

9. The five-tube main heat exchanger with a water box structure according to claim 8, characterized in that, The bottom plate of the water box is provided with a perimeter flange, the connecting protrusion is a square structure, the water inlet protrusion is an elliptical structure, the water outlet protrusion is an elliptical structure, the water inlet protrusion has a first flanged round hole, and the water outlet protrusion is provided with a second flanged round hole.

10. An energy-saving hot water boiler, characterized in that, Includes a five-tube main heat exchanger with a water box structure as described in any one of claims 1-9.

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