Heat exchange device and water heater thereof
By providing through holes and guide parts on the heat exchange plate, the problems of water cooling coil corrosion and insufficient utilization of high-temperature flue gas are solved, efficient heat exchange and structural simplification are achieved, and costs are reduced.
Patent Information
- Application Number
- CN202422560852.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-23
AI Technical Summary
The water-cooled coil structure of existing gas water heaters is prone to corrosion in areas with poor water quality, leading to water leakage problems. In addition, the high-temperature flue gas of the traditional heat exchange device cannot be fully utilized, resulting in low heat exchange efficiency and complex structure and high cost.
A heat exchange device is designed. By arranging multiple through holes side by side on the heat exchange plate and providing a guide part between the through holes, the guide part is used to concentrate the high-temperature flue gas to flow around the heat exchange tube, ensuring that the high-temperature flue gas can fully exchange heat with the back of the heat exchange tube, thereby improving the heat exchange efficiency.
The high-temperature flue gas is made to flow evenly around the heat exchange tube, which improves the heat exchange efficiency, simplifies the structure and reduces the cost.
Smart Images
Figure CN223388742U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of kitchen appliances, in particular to a heat exchange device and a water heater thereof. Background Art
[0002] The heat exchanger used in gas water heaters transfers heat from a hot fluid to a cold fluid to meet user hot water needs. Water-cooled coil-type heat exchangers are prone to corrosion due to high levels of impurities in water in areas with poor water quality, leading to quality issues such as leaks.
[0003] In traditional heat exchangers, high-temperature flue gas exchanges heat with the heat transfer medium within the heat exchange tubes. Most of the high-temperature flue gas can only exchange heat with the windward side of the tubes, leaving the back of the tubes unable to exchange heat with the high-temperature flue gas, resulting in low heat exchange efficiency. To meet heat exchange performance requirements, common heat exchangers on the market often have four, five, or even more heat exchange tubes, resulting in a complex overall heat exchange structure and high costs. Summary of the Invention
[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a heat exchange device with a simple structure that can concentrate high-temperature flue gas around the heat exchange tube to improve heat exchange efficiency.
[0005] According to the heat exchange device provided above, it is implemented through the following technical solutions:
[0006] A heat exchange device includes a fin group, the fin group includes a plurality of heat exchange fins arranged side by side at intervals, the heat exchange fins are provided with a plurality of through holes arranged side by side at intervals in the front-to-back direction, a first guide portion is provided between two adjacent through holes, the center of the first guide portion is higher than the center of the through hole, and second guide portions higher than the through holes are provided on both sides of the upper end of the first guide portion.
[0007] In some embodiments, the first guide portion is a V-shaped guide plate or a guide flange hole, the diameter of the guide flange hole is greater than 1 / 3 of the distance between two adjacent through holes, and the diameter of the guide flange hole is less than 1 / 2 of the distance between two adjacent through holes.
[0008] In some embodiments, the angle between two adjacent second guide portions is an obtuse angle.
[0009] In some embodiments, it is characterized in that the second guide portion includes two strip-shaped guide plates that are enclosed to form an "eight" shape, and the two strip-shaped guide plates are respectively arranged on both sides above the through hole.
[0010] In some embodiments, a third guide portion is provided at a position on the top of the heat exchange plate corresponding to the first guide portion; and / or fourth guide portions are provided at the front and rear ends of the heat exchange plate, respectively, and all the through holes are located between the two fourth guide portions.
[0011] In some embodiments, the maximum length of the third guide portion is greater than 1 / 2 of the distance between two adjacent through holes, and the maximum length of the third guide portion is less than the distance between two adjacent through holes.
[0012] In some embodiments, the third guide portion is a V-shaped diverter, and the angle of the V-shaped diverter is 110°-130°.
[0013] In some embodiments, the angle of the V-shaped flow splitter is the same as or similar to the angle between two adjacent second flow guide portions.
[0014] In some embodiments, it further includes two side plates and a plurality of heat exchange tubes, the two side plates are respectively arranged on the left and right outer sides of the fin group, and openings for the heat exchange tubes to pass through are opened at positions of the side plates corresponding to the through holes, the plurality of heat exchange tubes are arranged one-to-one correspondingly to the plurality of through holes on the heat exchange plates, and the heat exchange tubes are respectively transversely passed through the openings of the two side plates and the through holes on the heat exchange plates.
[0015] In some embodiments, guide plates are provided on both the front and rear outer sides of the fin group, respectively, and the guide plates are used to guide the high-temperature flue gas from the guide plates to the fin group.
[0016] In some embodiments, the guide plate includes a vertical section, a lower guide section and an upper guide section in an "L" shape, the vertical section is vertically arranged on the front outer side or the rear outer side of the fin group, the lower end of the vertical section is bent in the direction away from the fin group to form the lower guide section, and the upper end of the vertical section is bent upward in the direction away from the fin group to form the upper guide section.
[0017] According to the water heater provided above, it is implemented through the following technical solution: a water heater, which includes a heat exchange device as described above.
[0018] Compared with the prior art, the present invention has at least the following beneficial effects:
[0019] The heat exchange device of the present invention provides a plurality of through holes arranged side by side at intervals on the heat exchange plate, and provides a first guide portion located between the upper ends of two adjacent through holes, and a second guide portion located outside the upper end of the first guide portion and higher than the through holes on the heat exchange plate. With the cooperation of the through holes, the first guide portion and the second guide portion, the high-temperature flue gas can be concentrated to flow around the heat exchange tube, ensuring that the high-temperature flue gas can flow to the back of the heat exchange tube as much as possible for heat exchange, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a right side view of the heat exchanger in the embodiment of the present utility model;
[0021] Figure 2 This is a schematic structural diagram of a heat exchange device in an embodiment of the present utility model;
[0022] Figure 3 It is a side view of a dishwasher in an embodiment of the present utility model;
[0023] Figure 4 It is a structural schematic diagram of another heat exchange device in an embodiment of the present utility model.
[0024] In the figure: 1-heat exchange fin, 11-through hole, 12-first guide part, 13-second guide part, 14-third guide part, 15-fourth guide part; 2-side plate, 21-opening, 22-perforation, 23-side flange, 231-fixing hole; 3-heat exchange tube; 4-guide plate, 41-vertical section, 42-lower guide section, 43-upper guide section, 44-flange; 51-water inlet pipe, 52-water outlet pipe, 53-water connecting pipe. DETAILED DESCRIPTION
[0025] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.
[0026] Example 1
[0027] refer to Figure 1-2This embodiment provides a heat exchange device, including a fin group, two side plates 2, and a plurality of heat exchange tubes 3. The fin group is sandwiched between the two side plates 2. The fin group includes a plurality of heat exchange fins 1 arranged side by side in a left-right direction. The heat exchange fins 1 are formed by stretching a plate-like material. Each heat exchange fin 1 is provided with a plurality of through holes 11 arranged side by side in a front-to-back direction. Each through hole 11 is configured to allow a heat exchange tube 3 to pass through horizontally. In this embodiment, the number of through holes 11 is three, and the central axes of the three through holes 11 are located on the same horizontal plane. Each through hole 11 is preferably a circular flanged hole. Correspondingly, the number of heat exchange tubes 3 is also three, and the three heat exchange tubes 3 are respectively arranged horizontally through the three through holes 11. Compared with heat exchangers with more than four heat exchange tubes on the market, the heat exchange device of this embodiment has a simple structure, no coils, and a small number of heat exchange tubes. While meeting the product's heat exchange performance, it also better reduces costs.
[0028] A first guide portion 12 is provided between two adjacent through-holes 11. The center of the first guide portion 12 is higher than the center of the through-hole 11. The first guide portion 12 is used to guide the high-temperature flue gas flowing between the two adjacent through-holes 11 to the periphery of the upper end of the heat exchange tube 3, so that the high-temperature flue gas flows to the back of the heat exchange tube 3. Second guide portions 13 are provided on the left and right outer sides of the upper end of the first guide portion 12, respectively, and are located above the through-hole 11. The second guide portion 13 is used to flow the high-temperature flue gas to the back of the heat exchange tube 3 (i.e., the top of the heat exchange tube). It can be seen that with the cooperation of the through-hole 11, the first guide portion 12, and the second guide portion 13, the high-temperature flue gas can be concentrated to flow around the heat exchange tube 3, ensuring that the high-temperature flue gas can flow to the back of the heat exchange tube 3 as much as possible for heat exchange, thereby improving the heat exchange efficiency.
[0029] Optionally, the first guide portion 12 is formed integrally with the heat exchange plate 1, and the first guide portion 12 is a V-shaped guide plate or a guide flange hole. Figure 1 In this embodiment, the first guide portion 12 is taken as a guide flange hole as an example. The diameter D of the guide flange hole is greater than 1 / 3 of the distance a between two adjacent through holes 11, and the diameter D of the guide flange hole is less than 1 / 2 of the distance a between two adjacent through holes 11, that is, D∈(a / 3, a / 2). In this way, the heat exchange plate 1 has a better heat exchange structure and better heat exchange efficiency. The flow velocity of the high-temperature flue gas from the bottom to the top is V. The flow velocity V of the high-temperature flue gas can be better maintained consistent in each circulation channel, with good heat exchange efficiency and low exhaust resistance. If the distance D≥a / 2 or D≤a / 3, the velocity V changes greatly, then in the process of dynamic and static pressure conversion, additional energy loss will be generated, affecting the heat exchange effect. In particular, the first guide portion 12 can also be runway-shaped, triangular or polygonal, or can be a non-through-hole convex hull shape to further increase the heat exchange area and improve the heat exchange efficiency.
[0030] Optionally, the second guide portion 13 is integrally formed with the heat exchange fin 1, and the angle θ2 between adjacent second guide portions 13 is an obtuse angle. In this embodiment, the angle θ2 is preferably 110°-130°. The second guide portion 13 includes two strip-shaped guide fins that enclose each other to form an "eight" shape. The two strip-shaped guide fins are respectively disposed on the front and rear sides above the through hole 11 to direct the high-temperature flue gas to the back of the heat exchange tube 3.
[0031] refer to Figure 1 Furthermore, a third guide portion 14 is provided at a position on the top of the heat exchange plate 1 corresponding to the first guide portion 12, and is located above the first guide portion 12. The third guide portion 14 is integrally formed with the heat exchange plate 1, and is used to make the high-temperature flue gas more concentrated to flow around the heat exchange tube 3 (or through hole 11), so as to delay the separation of the high-temperature flue gas from the heat exchange tube 3; and / or fourth guide portions 15 are respectively provided at the front and rear ends of the heat exchange plate 1, and all the through holes 11 are located between the two fourth guide portions 15. The fourth guide portion 15 is configured to reduce the loss of flue gas on both sides of the heat exchange plate and improve the heat exchange efficiency. In this embodiment, the fourth guide portion 15 is composed of a plurality of small flanged holes arranged at intervals in the upper and lower directions.
[0032] Optionally, the maximum length b of the third guide portion 14 is greater than 1 / 2 of the distance a between two adjacent through holes 11, and the maximum length b of the third guide portion 14 is less than the distance a between two adjacent through holes 11, that is, b∈(a / 2, a), so that the high-temperature flue gas flow velocity V can be better maintained consistent in the circulation channel and the exhaust resistance is low.
[0033] The third flow guide 14 is preferably a V-shaped flow divider with an angle θ1 of 110°-130°. This allows the high-temperature flue gas to be more concentrated around the heat exchange tube 3 (or through hole 11), delaying its separation from the heat exchange tube 3, enhancing heat exchange intensity while reducing heat loss. This allows the high-temperature flue gas to flow to the back of the heat exchange tube 3 as much as possible for heat exchange, thereby improving heat exchange efficiency. In this embodiment, the angle θ1 of the V-shaped flow divider is the same as or similar to the angle θ2 between adjacent second flow guides 13. This ensures that the high-temperature flue gas flow velocity V is more consistent within the heat exchange channel, resulting in better heat exchange efficiency and low exhaust resistance.
[0034] refer to Figure 2-3The two side panels 2 are respectively arranged on the left and right outer sides of the fin group. Each side panel is formed by bending a plate-shaped stainless steel material. An opening 21 for the heat exchange tube 3 to pass through is opened at the position of the side panel 2 corresponding to the through hole 11. The opening 21 is used to support the heat exchange tube 3. The multiple heat exchange tubes 3 are arranged in a one-to-one correspondence with the multiple through holes 11 on the heat exchange plate 1. The heat exchange tubes 3 are respectively transversely passed through the openings 21 of the two side panels 2 and the through holes 11 on the heat exchange plate 1, so that the multiple heat exchange tubes 3 can be reliably supported by the two side panels 2. With the cooperation of the two side panels and the multiple heat exchange tubes 3, the fin group can be reliably supported. Optionally, a spoiler is installed in the heat exchange tube 3 to disturb the water in the heat exchange tube 3, improve the water flow noise, and prevent the water in the heat exchange tube from forming a laminar flow at the bottom of the heat exchange tube, which eventually causes the water flow along the wall to vaporize and produce abnormal noise while affecting the heat exchange efficiency.
[0035] Side flanges 23 extending away from the fin group are respectively provided at the front and rear ends of the side panel 2. Fixing holes 231 are provided on the side flanges 23 to facilitate the fixed installation of the heat exchange device on the upper part of the burner assembly of the water heater, effectively reducing the surface temperature of the front and rear sides of the burner assembly, while improving the combustion and heat exchange efficiency.
[0036] Furthermore, the heat exchange device also includes a water inlet pipe 51, a water outlet pipe 52 and a water connecting pipe 53. The water inlet pipe 51 is connected to the water inlet end of the heat exchange tube 3 arranged at the rear, and the water outlet pipe 52 is connected to the water outlet end of the heat pipe 3 arranged at the front. The water inlet end of the heat exchange tube is connected to the water outlet end of the adjacent heat exchange tube through the water connecting pipe 53 to realize water flow reversal.
[0037] This embodiment also provides a water heater, comprising the heat exchange device described above. When the water heater is operating, high-temperature flue gas flows upward from the underside of the heat exchange plate 1. Heat around the heat exchange plate is conducted through the walls of the heat exchange tube 3 into the cooling fluid within the heat exchange tube. After sufficient heat exchange, the heat exchange tube 3 is discharged from the upper side of the heat exchange plate. The heat exchange tube 3 serves as the water passage of the heat exchange device and, in conjunction with the heat exchange plate 1, heats the water flow by absorbing heat from the high-temperature flue gas generated by the combustion of the gas.
[0038] Example 2
[0039] refer to Figure 4 The difference between this embodiment and embodiment 1 is that it further includes two guide plates 4, which are respectively arranged on the front and rear outer sides of the fin group. The left and right ends of each guide plate 4 are respectively connected and fixed to the two side plates 2. The guide plates 4 are used to guide the high-temperature flue gas from the guide plates 4 to the fin group to improve the heat exchange effect.
[0040] The guide plate 4 includes a vertical section 41, a lower guide section 42, and an L-shaped upper guide section 43. The vertical section 41 is vertically arranged on the front or rear outer side of the fin group and is connected and fixed to the two side panels. The lower end of the vertical section 41 is bent away from the fin group to form the lower guide section 42, and the upper end of the vertical section 41 is bent upward away from the fin group to form the upper guide section 43. In this embodiment, the vertical section 41 is arranged in the middle of the height direction of the fin group. Flange edges 44 extending away from the fin group are respectively provided at the left and right ends of the vertical section 41. Through holes 22 for fasteners (such as screws) to pass through are provided at the positions of the side panels 2 corresponding to the flange edges 44. During installation, the fasteners are inserted from the outside to the inside through the through holes 22 of the side panels 2 and are fastened to the flange edges 44, thereby connecting and fixing the two ends of the guide plate 4 to the two side panels.
[0041] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.
Claims
1. A heat exchange device, characterized in that: The invention comprises a fin group, wherein the fin group comprises a plurality of heat exchange fins (1) arranged side by side at intervals, the heat exchange fins (1) are provided with a plurality of through holes (11) arranged side by side at intervals in the front-to-back direction, a first air guide (12) is provided between two adjacent through holes (11), the center of the first air guide (12) is higher than the center of the through hole (11), and second air guides (13) higher than the through hole (11) are provided on both sides of the upper end of the first air guide (12).
2. A heat exchange device according to claim 1, characterized in that: The first guide portion (12) is a V-shaped guide plate or a guide flange hole, the diameter of the guide flange hole is greater than 1 / 3 of the distance between two adjacent through holes (11), and the diameter of the guide flange hole is less than 1 / 2 of the distance between two adjacent through holes (11).
3. A heat exchange device according to claim 1, characterized in that: The included angle between two adjacent second flow guide portions (13) is an obtuse angle.
4. A heat exchange device according to claim 1 or 3, characterized in that: The second guide portion (13) comprises two strip-shaped guide plates that are enclosed to form an "eight" shape, and the two strip-shaped guide plates are respectively arranged on both sides above the through hole (11).
5. The heat exchange device according to claim 1, characterized in that: A third guide portion (14) is provided at a position on the top of the heat exchange plate (1) corresponding to the first guide portion (12); and / or fourth guide portions (15) are provided at the front and rear ends of the heat exchange plate (1), respectively, and all the through holes (11) are located between the two fourth guide portions (15).
6. A heat exchange device according to claim 5, characterized in that: The maximum length of the third guide portion (14) is greater than 1 / 2 of the distance between two adjacent through holes (11), and the maximum length of the third guide portion (14) is less than the distance between two adjacent through holes (11).
7. A heat exchange device according to claim 5 or 6, characterized in that: The third guide portion (14) is a V-shaped diverter plate, and the angle of the V-shaped diverter plate is 110°-130°.
8. A heat exchange device according to claim 7, characterized in that: The angle of the V-shaped diverter piece is the same as or similar to the angle between two adjacent second guide portions (13).
9. The heat exchange device according to claim 1, characterized in that: The heat exchange tube (3) further comprises two side plates (2) and a plurality of heat exchange tubes (3), wherein the two side plates (2) are respectively arranged on the left and right outer sides of the fin group, and openings (21) for the heat exchange tubes (3) to pass through are provided at positions of the side plates (2) corresponding to the through holes (11), and the plurality of heat exchange tubes (3) are arranged in a one-to-one correspondence with the plurality of through holes (11) on the heat exchange plate (1), and the heat exchange tubes (3) are respectively transversely passed through the openings of the two side plates (2) and the through holes (11) on the heat exchange plate (1).
10. A heat exchange device according to claim 1 or 9, characterized in that: Guide plates (4) are respectively provided on the front and rear outer sides of the fin group, and the guide plates (4) are used to guide high-temperature flue gas from the guide plates (4) to the fin group.
11. A water heater, characterized in that: The heat exchange device comprises a heat exchange device as described in any one of claims 1 to 10.