Heat exchanger and gas water heater

Abstract

The utility model discloses a heat exchanger and gas water heater, the heat exchanger has multiple heat exchange pipes, the multiple heat exchange pipes include at least two kinds among corrugated heat exchange pipe, light pipe heat exchange pipe and fin heat exchange pipe, the quantity ratio of arbitrary two or three of corrugated heat exchange pipe, light pipe heat exchange pipe and fin heat exchange pipe is configured to match with the heat exchange efficiency of heat exchanger. Adopt this scheme, the heat exchange pipe in heat exchanger includes at least two kinds among the three types of heat exchange pipe of corrugated heat exchange pipe, light pipe heat exchange pipe and fin heat exchange pipe, compared with fin heat exchange pipe, the other two heat exchange pipes need less special design when configuration, and configuration is more convenient. When facing the heat exchange efficiency requirement of different heat exchanger, can satisfy through the quantity ratio of configuration at least two different heat exchange pipes. This mode can effectively reduce the cost spent when designing and manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange, and in particular to a heat exchanger and a gas water heater. Background Technology

[0002] In stainless steel gas water heaters, the heat exchanger is the core component. The industry standard for stainless steel heat exchangers involves heat exchange tubes with external fins for indirect heat exchange, thus heating water from high-temperature flue gas. However, adapting this method to new products requires a complete redesign and molding of the entire fin system, resulting in higher time and cost. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology of finned heat exchangers, which require complex redesign when facing different heat exchange efficiencies, and to provide a heat exchanger and a gas water heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A heat exchanger having a plurality of heat exchange tubes, the plurality of heat exchange tubes including at least two of corrugated heat exchange tubes, smooth heat exchange tubes, and finned heat exchange tubes.

[0006] The quantity ratio of any two or three of the corrugated heat exchange tubes, the smooth tube heat exchange tubes, and the finned heat exchange tubes is configured to match the heat exchange efficiency of the heat exchanger.

[0007] In this design, the heat exchanger uses at least two of three types of heat exchange tubes: corrugated heat exchange tubes, smooth heat exchange tubes, and finned heat exchange tubes. Compared to finned heat exchange tubes, the other two types require less specialized design and are easier to configure. Therefore, different heat exchange efficiency requirements can be met by configuring at least two different types of heat exchange tubes in varying proportions. This approach effectively reduces design and manufacturing costs.

[0008] Preferably, at least one of the plurality of heat exchange tubes is a corrugated heat exchange tube, and the remaining heat exchange tubes are one or both of the bare tube heat exchange tube and the finned heat exchange tube.

[0009] In this design, the inner wall of the corrugated heat exchanger tube has a streamlined shape, which allows the water flowing inside the tube to continuously scour the tube wall, thus preventing the accumulation of air bubbles caused by rising water temperature and preventing the water from boiling. The corrugated heat exchanger tube can be configured in combination with one or two of the other two types of heat exchanger tubes to meet the heat exchange efficiency requirements of the heat exchanger.

[0010] Preferably, the corrugated heat exchange tube has corrugated sections, and the ratio of one or two of the corrugated heat exchange tube, the smooth tube heat exchange tube, and the finned heat exchange tube, together with the heat exchange area of ​​the corrugated heat exchange tube, is configured to match the heat exchange efficiency of the heat exchanger, wherein the heat exchange area of ​​the corrugated heat exchange tube is related to the length, waveform, and spacing of the corrugated sections.

[0011] In this scheme, the heat exchange area of ​​the corrugated heat exchange tube can be adjusted by its waveform, spacing and length, so that based on the proportion of different heat exchange tubes, the corrugated heat exchange tube can be further finely adjusted to match the heat exchange efficiency.

[0012] Preferably, the multiple heat exchange tubes are connected in series to form at least one heat exchange layer.

[0013] Preferably, the heat exchange layer includes a finned heat exchange layer and a tube heat exchange layer, the finned heat exchange layer being formed by a plurality of finned heat exchange tubes, and the tube heat exchange layer including at least one of the corrugated heat exchange tube and the smooth tube heat exchange tube.

[0014] In this design, the heat exchanger is configured with both a finned heat exchange layer and a tube heat exchange layer, which facilitates the arrangement of the finned heat exchange tubes and results in higher heat exchange efficiency. The tube heat exchange layer can contain one or both corrugated and smooth heat exchange tubes. This simplifies the matching process for different heat exchange efficiencies by allowing the initial configuration of the ratio of corrugated to smooth heat exchange tubes in the tube heat exchange layer before configuring the heat exchange tubes according to different heat exchange efficiencies.

[0015] Preferably, the finned heat exchange layer is located upstream or downstream of the tube heat exchange layer along the direction of gas flow.

[0016] Preferably, the finned heat exchange layer includes multiple tubes and multiple fins, the multiple tubes are arranged side by side along the transverse direction of the heat exchanger, each fin is sleeved on the multiple tubes, and the multiple fins are arranged sequentially along the axial direction of the tubes.

[0017] Preferably, the tube heat exchange layer includes the corrugated heat exchange tube and the smooth heat exchange tube, and the corrugated heat exchange tube and the smooth heat exchange tube are arranged alternately in sequence along the direction of liquid flow in the heat exchange tube.

[0018] Alternatively, along the direction of liquid flow within the heat exchange tubes, one type of heat exchange tube (corrugated or smooth) can be arranged first, followed by the other type.

[0019] Preferably, the heat exchange layer of the tube body has multiple corrugated heat exchange tubes, and the heat exchange areas of the multiple corrugated heat exchange tubes are the same as each other, or different from each other, or partially the same.

[0020] In this solution, the heat exchange area of ​​multiple corrugated heat exchange tubes can also be configured according to requirements to meet the heat exchange efficiency requirements of the heat exchanger.

[0021] A gas water heater, characterized in that the gas water heater includes a heat exchanger as described above.

[0022] The significant advantages of this invention are as follows: the heat exchanger tubes include at least two of the following three types: corrugated heat exchanger tubes, smooth heat exchanger tubes, and finned heat exchanger tubes. Compared to finned heat exchanger tubes, the other two types require less specialized design and are more convenient to configure. Therefore, different heat exchange efficiency requirements can be met by configuring at least two different proportions of heat exchanger tubes. This approach effectively reduces design and manufacturing costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of the present utility model;

[0024] Figure 2 A schematic diagram of the structure of a corrugated heat exchanger tube provided in an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of the structure of a light tube heat exchanger provided in an embodiment of this utility model;

[0026] Figure 4 A schematic diagram of the structure of a finned heat exchanger tube provided in an embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of another heat exchanger provided in an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of another heat exchanger provided in an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of another heat exchanger provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] Heat exchanger 10, finned heat exchange layer 11, tube heat exchange layer 12, corrugated heat exchange tube 100, bare tube heat exchange tube 200, finned heat exchange tube 300, tube body 310, fins 320. Detailed Implementation

[0032] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0033] This invention provides a heat exchanger 10, which has multiple heat exchange tubes, including at least two types of corrugated heat exchange tubes 100, smooth heat exchange tubes 200, and finned heat exchange tubes 300. The quantity ratio of any two or three of the corrugated heat exchange tubes 100, smooth heat exchange tubes 200, and finned heat exchange tubes 300 is configured to match the heat exchange efficiency of the heat exchanger 10. The heat exchange tubes in the heat exchanger 10 include at least two of the three types of heat exchange tubes: corrugated heat exchange tubes 100, smooth heat exchange tubes 200, and finned heat exchange tubes 300. Compared to finned heat exchange tubes 300, the other two types of heat exchange tubes require less specialized design and are more convenient to configure. Therefore, when facing different heat exchange efficiency requirements of the heat exchanger 10, these requirements can be met by configuring at least two different heat exchange tubes in varying quantities. This method can effectively reduce the design and manufacturing costs.

[0034] In a gas water heater, high-temperature flue gas flows towards heat exchanger 10, heating the water inside the heat exchange tubes. Generally, the heat exchange capacity of finned heat exchange tube 300 is superior to that of corrugated heat exchange tube 100, and the heat exchange capacity of corrugated heat exchange tube 100 is superior to that of bare tube heat exchange tube 200. Therefore, based on the required heat exchange efficiency of heat exchanger 10, appropriate types and quantities of corrugated heat exchange tube 100, bare tube heat exchange tube 200, and finned heat exchange tube 300 can be selected. Compared to heat exchanger 10 having only one type of heat exchange tube, having two or more types of heat exchange tubes allows for the utilization of different heat exchange capacities to achieve the desired heat exchange efficiency.

[0035] Furthermore, compared to existing heat exchangers 10 with only a single heat exchange tube, such as finned heat exchange tubes 300, some of the finned heat exchange tubes 300 can be replaced with corrugated heat exchange tubes 100 and / or smooth heat exchange tubes 200. These two types of heat exchange tubes have lower air resistance, thus reducing fan speed while achieving the same heat exchange effect. They also avoid the complexity of finned heat exchange tube 300 design, which is beneficial for the flexible configuration of the heat exchanger 10. In addition, the tube body 310 and fins 320 of the finned heat exchange tube 300 need to be welded together with solder. At high temperatures, the solder melts and fills the gap between the fins 320 and the tube body 310 to achieve good heat exchange performance. Replacing some of the finned heat exchange tubes 300 with corrugated heat exchange tubes 100 and / or smooth heat exchange tubes 200 reduces the amount of stainless steel used, as these two types of heat exchange tubes do not require welding of fins 320; and the removal of fins 320 further reduces the use of solder. Therefore, it is also beneficial to the cost of heat exchanger 10.

[0036] Furthermore, it is understood that the heat exchange tubes in heat exchanger 10 can be configured as a combination of corrugated heat exchange tube 100 and smooth heat exchange tube 200, or corrugated heat exchange tube 100 and finned heat exchange tube 300, or smooth heat exchange tube 200 and finned heat exchange tube 300, or a combination of all three. The following embodiments further illustrate some feasible implementations of this utility model, but the scope of protection should not be limited to the following combinations, quantity selections, and quantity ratios.

[0037] In some implementations, such as Figure 1 , Figure 6 and Figure 7 As shown, at least one of the multiple heat exchange tubes is a corrugated heat exchange tube 100, and the remaining heat exchange tubes are one or both of the following: smooth tube heat exchange tubes 200 and finned heat exchange tubes 300. After the high-temperature flue gas heats the water inside the heat exchange tubes, under heavy load, the water temperature inside the tubes rises, generating a large number of bubbles. These bubbles first accumulate on the inner wall of the tubes, subsequently producing a significant noise, namely the sound of boiling water. The corrugated heat exchange tube 100 has a streamlined inner wall, which allows the water flow inside the tubes to continuously scour the tube wall during the flow process, thereby preventing the accumulation of bubbles generated by the rise in water temperature on the tube wall and thus preventing the water from boiling. The corrugated heat exchange tube 100 can be combined with one or both of the other two types of heat exchange tubes to meet the heat exchange efficiency requirements of the heat exchanger 10. Therefore, for the heat exchanger 10 equipped with the corrugated heat exchange tube 100, the generation of noise can be effectively reduced. In addition, compared with the existing method of adding corrugated plates and springs inside the corrugated heat exchange tube 100 to disperse air bubbles and reduce noise, configuring the corrugated heat exchange tube 100 can also reduce costs.

[0038] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the corrugated heat exchanger tube 100 has corrugated sections. The quantity ratio of one or two of the following—corrugated heat exchanger tube 100, smooth tube heat exchanger tube 200, and finned heat exchanger tube 300—is configured together with the heat exchange area of ​​the corrugated heat exchanger tube 100 to match the heat exchange efficiency of the heat exchanger 10. The heat exchange area of ​​the corrugated heat exchanger tube 100 is related to the length, waveform, and spacing of the corrugated sections. The heat exchange area of ​​the corrugated heat exchanger tube 100 can be adjusted by its waveform, spacing, and length. Specifically, when the fluid flows inside the corrugated heat exchanger tube 100, the flow cross-section changes continuously, and the magnitude and direction of the fluid velocity also change. The smaller the ratio of wavelength to peak value (i.e., the higher the peak value and the denser the corrugations), the higher the turbulence, the larger the heat exchange area, and the better the heat exchange effect. Therefore, based on different quantities of heat exchanger tubes, the corrugated heat exchanger tube 100 can be further finely adjusted to match the heat exchange efficiency.

[0039] The heat exchange layer 12 has multiple corrugated heat exchange tubes 100. The heat exchange areas of the multiple corrugated heat exchange tubes 100 may be the same, different, or partially the same. The heat exchange areas of the multiple corrugated heat exchange tubes 100 can also be configured according to requirements to meet the heat exchange efficiency requirements of the heat exchanger 10.

[0040] In other implementations, such as Figure 5 As shown, the multiple heat exchange tubes include a bare tube heat exchange tube 200 and a finned heat exchange tube 300.

[0041] like Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, multiple heat exchange tubes are connected in series to form at least one heat exchange layer. Furthermore, the two ends of each heat exchange tube can be connected to the end walls of the heat exchanger 10, and connected in series on the outside of the end walls via U-shaped connecting pipes. The multiple heat exchange layers are arranged layer by layer along the direction of high-temperature flue gas flow, allowing the flue gas to pass through each heat exchange layer and exchange heat with each of the different heat exchange layers.

[0042] In some embodiments, the heat exchange layer may include at least one tube heat exchange layer 12. Any tube heat exchange layer 12 may have only corrugated heat exchange tubes 100, or only smooth heat exchange tubes 200, or both corrugated heat exchange tubes 100 and smooth heat exchange tubes 200.

[0043] In other implementations, such as Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, the heat exchange layer may include a finned heat exchange layer 11 and a tube heat exchange layer 12. The finned heat exchange layer 11 is formed by multiple finned heat exchange tubes 300, and the tube heat exchange layer 12 includes at least one of corrugated heat exchange tubes 100 and smooth heat exchange tubes 200. Configuring the heat exchanger 10 with both the finned heat exchange layer 11 and the tube heat exchange layer 12 facilitates the arrangement of the finned heat exchange tubes 300 and results in higher heat exchange efficiency for the finned heat exchange tubes 300. The tube heat exchange layer 12 may contain one or both of the corrugated heat exchange tubes 100 and smooth heat exchange tubes 200. Therefore, when configuring heat exchange tubes according to different heat exchange efficiencies of the heat exchanger 10, the ratio of the number of corrugated heat exchange tubes 100 to smooth heat exchange tubes 200 in the tube heat exchange layer 12 can be configured first, thereby simplifying the matching process for different heat exchange efficiencies.

[0044] like Figure 2 As shown, the corrugated heat exchanger tube 100 is a heat exchanger tube with a corrugated section in the middle. Figure 3 As shown, the bare tube heat exchanger 200 is a heat exchanger tube with an outer diameter and inner diameter that are basically the same. For example... Figure 4 As shown, the finned heat exchange tube 300 is a heat exchange tube with fins 320 wrapped around the tube body 310.

[0045] Furthermore, such as Figure 4 As shown, the finned heat exchange tubes 300 are typically assembled into a single integral finned heat exchange layer 11. The finned heat exchange layer 11 includes multiple tube bodies 310 and multiple fins 320. The multiple tube bodies 310 are arranged side-by-side along the transverse direction of the heat exchanger 10, each fin 320 is fitted onto multiple tube bodies 310, and the multiple fins 320 are arranged sequentially along the axial direction of the tube bodies 310. Here, transverse direction refers to the direction perpendicular to the flow direction of the high-temperature flue gas.

[0046] like Figure 1 , Figure 5 and Figure 6 As shown, along the direction of gas flow, the finned heat exchange layer 11 is located upstream of the tube heat exchange layer 12. Alternatively, as... Figure 7 As shown, the finned heat exchange layer 11 is located downstream of the tube heat exchange layer 12.

[0047] When the heat exchange layer 12 of the tube body simultaneously has corrugated heat exchange tubes 100 and smooth heat exchange tubes 200, the arrangement of the corrugated heat exchange tubes 100 and smooth heat exchange tubes 200 can also be flexibly adjusted. In one embodiment, such as Figure 6 As shown, corrugated heat exchange tubes 100 and smooth heat exchange tubes 200 are arranged alternately along the direction of liquid flow within the heat exchange tubes. In another embodiment, along the direction of liquid flow within the heat exchange tubes, one type of corrugated heat exchange tube 100 and smooth heat exchange tube 200 is arranged first, followed by the other type of corrugated heat exchange tube 100 and smooth heat exchange tube 200.

[0048] In practical implementation, the number of finned heat exchange layer 11 and tube body heat exchange layer 12 can be configured according to requirements. Figure 1 , Figure 5 , Figure 6 and Figure 7 Taking the two heat exchange layers shown as an example, when facing different heat exchange efficiency requirements of heat exchanger 10, a finned heat exchange layer 11 can be configured first on the upstream or downstream side. Adjustments can be made by changing the type and proportion of heat exchange tubes in the tube heat exchange layer 12. For example, for heat exchanger 10 with relatively high heat exchange efficiency requirements, such as... Figure 1 As shown, all heat exchange tubes in the heat exchange layer 12 can be configured as corrugated heat exchange tubes 100; for heat exchangers 10 with relatively low heat exchange efficiency requirements, such as Figure 5 As shown, all heat exchange tubes in the heat exchange layer 12 can be configured as bare tube heat exchange tubes 200; for heat exchangers 10 with moderate heat exchange efficiency requirements, such as Figure 6As shown, a portion of the heat exchange tubes in the tube body heat exchange layer 12 can be configured as corrugated heat exchange tubes 100, and the other portion as smooth heat exchange tubes 200. For the corrugated heat exchange tubes 100, the heat exchange area of ​​each corrugated heat exchange tube 100 can be further configured to further adjust the heat exchange efficiency. Therefore, when designing different heat exchangers 10, the finned heat exchange layer 11 and related structures do not need to be modified; instead, the configuration can be achieved by replacing the heat exchange tubes within the tube body heat exchange layer 12, simplifying the design and manufacturing process and reducing costs.

[0049] This utility model embodiment also provides a gas water heater, which includes a heat exchanger 10 as described above.

[0050] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A heat exchanger, characterized in that, The heat exchanger contains multiple heat exchange tubes, which include at least two types of heat exchange tubes: corrugated heat exchange tubes, smooth heat exchange tubes, and finned heat exchange tubes. The quantity ratio of any two or three of the corrugated heat exchange tubes, the smooth tube heat exchange tubes, and the finned heat exchange tubes is configured to match the heat exchange efficiency of the heat exchanger.

2. The heat exchanger as described in claim 1, characterized in that, At least one of the multiple heat exchange tubes is a corrugated heat exchange tube, and the remaining heat exchange tubes are one or both of the smooth tube heat exchange tubes and the finned heat exchange tubes.

3. The heat exchanger as described in claim 2, characterized in that, The corrugated heat exchange tube has corrugated sections. The ratio of one or two of the corrugated heat exchange tubes, the smooth tube heat exchange tubes, and the finned heat exchange tubes, together with the heat exchange area of ​​the corrugated heat exchange tubes, is configured to match the heat exchange efficiency of the heat exchanger. The heat exchange area of ​​the corrugated heat exchange tubes is related to the length, waveform, and spacing of the corrugated sections.

4. The heat exchanger according to any one of claims 1-3, characterized in that, The multiple heat exchange tubes are connected in series to form at least one heat exchange layer.

5. The heat exchanger as described in claim 4, characterized in that, The heat exchange layer includes a finned heat exchange layer and a tube heat exchange layer. The finned heat exchange layer is formed by multiple finned heat exchange tubes, and the tube heat exchange layer includes at least one of the corrugated heat exchange tubes and the smooth tube heat exchange tubes.

6. The heat exchanger as described in claim 5, characterized in that, Along the direction of gas flow, the finned heat exchange layer is located upstream or downstream of the tube heat exchange layer.

7. The heat exchanger as described in claim 5, characterized in that, The finned heat exchange layer includes multiple tubes and multiple fins. The multiple tubes are arranged side by side along the transverse direction of the heat exchanger, each fin is fitted onto the multiple tubes, and the multiple fins are arranged sequentially along the axial direction of the tubes.

8. The heat exchanger as described in claim 5, characterized in that, The tube heat exchange layer includes the corrugated heat exchange tube and the smooth heat exchange tube, and the corrugated heat exchange tube and the smooth heat exchange tube are arranged alternately in sequence along the direction of liquid flow in the heat exchange tube. Alternatively, along the direction of liquid flow within the heat exchange tubes, one type of heat exchange tube (corrugated or smooth) can be arranged first, followed by the other type.

9. The heat exchanger as described in claim 5, characterized in that, The heat exchange layer of the tube body has multiple corrugated heat exchange tubes, and the heat exchange areas of the multiple corrugated heat exchange tubes are the same as each other, or different from each other, or partially the same.

10. A gas-fired water heater, characterized in that, The gas water heater includes a heat exchanger as described in any one of claims 1-9.

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