Heat exchanger and heat exchanger

Abstract

The present invention relates to a heat exchange plate and a heat exchanger. During use, high-temperature flue gas entering the heat exchange shell contacts the first heat conducting part and flows through the first heat conducting part. When flowing through the first heat conducting part, the high-temperature flue gas will exchange heat with it. Since the distance L0 between the heat conducting surface and the hole wall of the first mounting hole gradually increases along the direction of flue gas flow, the portion of the heat conducting surface that first contacts the high-temperature flue gas is the shortest distance from the first mounting hole. As the flue gas flows, the portion that contacts the heat conducting surface becomes increasingly distant from the first mounting hole. Since the flue gas temperature gradually decreases as it flows, the flue gas temperature in the portion that contacts the shortest distance from the first mounting hole is the highest, and the flue gas temperature in the portion that is longer from the first mounting hole is the second lowest, so that the temperature on the plate body reaches equilibrium, ensuring that the temperature on the heat exchange plate is evenly distributed, and avoiding the generation of local high temperature on the plate body, which is beneficial to improving the thermal efficiency and corrosion resistance of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to a heat exchanger, in particular to a heat exchange plate and a heat exchanger. Background Art

[0002] Traditional heat exchangers utilize pure copper for their heat exchanger fins. Since pure copper is easily oxidized and corroded in high temperatures and acidic flue gases, heat exchangers can easily become clogged during use, even damaging hot water equipment. Stainless steel, with its excellent oxidation and corrosion resistance, is an ideal alternative to copper for heat exchanger fins. However, stainless steel suffers from low heat transfer coefficients and efficiency, making it susceptible to localized high temperatures that can cause intergranular corrosion, severely degrading its corrosion resistance. Summary of the Invention

[0003] The first technical problem solved by the present invention is to provide a heat exchange plate, which can effectively solve the problem of local high temperature on the heat exchange plate, make the temperature evenly distributed, and improve the thermal efficiency and corrosion resistance of the heat exchanger.

[0004] The second technical problem solved by the present invention is to provide a heat exchanger that can effectively solve the problem of local high temperature on the heat exchange plate, make the temperature evenly distributed, and improve the thermal efficiency and corrosion resistance of the heat exchanger.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A heat exchange plate, comprising a plate body, a first heat conducting portion being provided on one side of the plate body, the first heat conducting portion being used to be arranged toward the smoke inlet of the heat exchange shell, a first mounting hole being provided on the plate body for mounting a heat exchange tube, the first heat conducting portion being arranged around the first mounting hole, the first heat conducting portion including two oppositely arranged heat conducting surfaces on the side facing away from the first mounting hole, and the distance L0 between the heat conducting surfaces and the hole wall corresponding to the first mounting hole gradually increasing along the direction of smoke flow.

[0007] The heat exchanger plate of the present invention offers advantages over the prior art. During use, the plate body is installed within the heat exchange shell of the heat exchanger, with the first heat-conducting portion facing the smoke inlet of the shell. The heat exchange tube is then secured in the first mounting hole. High-temperature flue gas entering the heat exchange shell then contacts and flows through the first heat-conducting portion. While flowing through the first heat-conducting portion, the high-temperature flue gas exchanges heat with the first heat-conducting portion. Because the distance L0 between the heat-conducting surface and the wall of the first mounting hole gradually increases along the direction of flue gas flow, the portion of the heat-conducting surface that first contacts the high-temperature flue gas is the shortest from the first mounting hole. As the flue gas flows, the portion contacting the heat-conducting surface moves further away from the first mounting hole. Furthermore, because the flue gas temperature gradually decreases as it flows, the flue gas temperature is maintained at the portion shortest from the first mounting hole, while the flue gas temperature is maintained at the lowest from the portion farther from the first mounting hole. This ensures that the temperature on the plate body reaches equilibrium, ensuring uniform temperature distribution across the plate body and preventing localized high temperatures on the plate body. This improves the thermal efficiency and corrosion resistance of the heat exchanger.

[0008] In one embodiment, the heat-conducting surface is a portion of an elliptical cylinder, the ratio of the short axis to the long axis of the cross-sectional profile of the elliptical cylinder where the heat-conducting surface is located is a first ratio D1, the first mounting hole is an elliptical hole, the long axis of the first mounting hole is arranged along the direction of the flue gas flow, the ratio of the short axis to the long axis of the first mounting hole is a second ratio D2, and the first ratio D1 is greater than the second ratio D2.

[0009] In one embodiment, the center of the ellipse of the first heat conducting portion coincides with the center of the ellipse of the first mounting hole, and the first ratio D1 is 1.25 to 1.5 of the second ratio D2.

[0010] In one embodiment, there are at least two of the first heat-conducting parts and the first mounting holes. The first heat-conducting parts are arranged at intervals along one side of the sheet body, and a first notch is provided between two adjacent first heat-conducting parts. The sheet body is provided with a second mounting hole for mounting the heat exchange tube, and the second mounting hole is arranged opposite to the first notch.

[0011] In one embodiment, the short axis endpoints of the cross-sectional profile of the elliptical cylinder where two adjacent heat-conducting surfaces are located are respectively connected with an end point of the long axis of the second mounting hole away from the first notch to form a third boundary line and a fourth boundary line respectively, and the first notch extends from the third boundary line to the fourth boundary line.

[0012] In one embodiment, a heat conducting hole is provided on the sheet body, the heat conducting hole is located between the first notch and the second mounting hole, the heat conducting hole extends along the periphery of the second mounting hole, and the heat conducting hole is communicated with the first notch.

[0013] In one embodiment, a hole wall of the heat conducting hole close to the second mounting hole is a portion of an elliptical cylinder, the second mounting hole is an elliptical hole, the major axis of the second mounting hole is arranged along the direction of the flue gas flow, and the ratio D3 of the minor axis to the major axis of a hole wall of the heat conducting hole is 1.35 to 1.55 of the ratio D4 of the minor axis to the major axis of the second mounting hole.

[0014] In one embodiment, a long axis endpoint of the first mounting hole close to the second mounting hole is a boundary endpoint, the boundary endpoints on both sides of the first notch are connected to the center line of the second mounting hole, and form a first boundary line and a second boundary line respectively, and the thermal conductive hole extends from the first boundary line to the second boundary line.

[0015] In one embodiment, a guide edge is provided on the sheet body, the guide edge is arranged around the periphery of the second mounting hole, and a second notch for smoke exhaust is provided on the guide edge.

[0016] In one embodiment, first flanges are provided at opposite ends of the sheet body, and a distance L1 between the first flanges and the centers of adjacent first mounting holes is less than half of a distance L2 between the centers of two adjacent first mounting holes.

[0017] In one embodiment, the sheet body is further provided with a second flange, and the second flange is arranged around the edge of the first mounting hole.

[0018] In one embodiment, a guide portion is provided on the sheet body, and the guide portion is located between one end of the sheet body and the first mounting hole.

[0019] The second technical problem mentioned above is solved by the following technical solution:

[0020] A heat exchanger comprises a heat exchange shell, a heat exchange tube and the heat exchange plate described in any one of the above items, wherein the plate body is installed in the heat exchange shell, and the first heat conducting part faces the smoke inlet of the heat exchange shell, and the heat exchange tube is inserted into the first mounting hole.

[0021] The heat exchanger described in the present invention has the following beneficial effects compared with the background technology: using the above heat exchange plate, during use, the plate body is installed in the heat exchange shell of the heat exchanger, so that the first heat-conducting part is arranged toward the smoke inlet of the heat exchange shell; and then the heat exchange tube is fixed in the first mounting hole. At this time, the high-temperature flue gas entering the heat exchange shell contacts the first heat-conducting part and flows through the first heat-conducting part. When flowing through the first heat-conducting part, the high-temperature flue gas will exchange heat with it. Since the distance L0 between the heat-conducting surface and the hole wall of the first mounting hole gradually increases along the direction of flue gas flow, the part of the heat-conducting surface that first contacts the high-temperature flue gas is the shortest distance from the first mounting hole. As the flue gas flows, the part in contact with the heat-conducting surface becomes farther and farther away from the first mounting hole. Since the flue gas temperature gradually decreases as it flows, the flue gas temperature in the part with the shortest distance from the first mounting hole is the highest, and the flue gas temperature in the part with the longest distance from the first mounting hole is second, so that the temperature on the plate body reaches equilibrium, ensuring uniform temperature distribution on the heat exchange plate, avoiding local high temperature on the plate body, and thus helping to improve the thermal efficiency and corrosion resistance of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A perspective view of a heat exchange fin structure according to an embodiment;

[0025] Figure 2 Another perspective view of the heat exchange fin structure in one embodiment;

[0026] Figure 3 Schematic diagram of the heat exchange plate structure in another embodiment;

[0027] Figure 4 This is a thermal field analysis diagram of a traditional heat exchanger in one embodiment;

[0028] Figure 5 This is a thermal field analysis diagram of the heat exchange plate of the present application in one embodiment.

[0029] Reference numerals:

[0030] 100. Heat exchange plate, 110. Plate body, 111. First mounting hole, 1111. Second flange, 1112. Boundary endpoint, 112. First notch, 113. Heat conduction hole, 114. Second mounting hole, 1141. Third flange, 115. Third notch, 120. First heat conduction part, 121. Heat conduction surface, 130. Second heat conduction part, 131. Guide edge, 132. Second notch, 140. First flange, 150. Guide part, 160. First boundary line, 170. Second boundary line, 180. Third boundary line, 190. Fourth boundary line. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In one embodiment, please refer to Figure 1 and Figure 2 A heat exchange plate 100 includes a plate body 110. A first heat conducting portion 120 is provided on one side of the plate body 110. The first heat conducting portion 120 is used to be arranged toward the smoke inlet of the heat exchange shell. A first mounting hole 111 for mounting a heat exchange tube is provided on the plate body 110. The first heat conducting portion 120 is arranged around the first mounting hole 111. The side of the first heat conducting portion 120 facing away from the first mounting hole 111 includes two oppositely arranged heat conducting surfaces 121. The distance L0 between the heat conducting surface 121 and the hole wall corresponding to the first mounting hole 111 gradually increases along the direction of smoke flow.

[0033] During use of the above-mentioned heat exchange plate 100, the plate body 110 is installed in the heat exchange shell of the heat exchanger so that the first heat-conducting part 120 is arranged toward the smoke inlet of the heat exchange shell; and then the heat exchange tube is fixed in the first mounting hole 111. At this time, the high-temperature flue gas entering the heat exchange shell contacts the first heat-conducting part 120 and flows through the first heat-conducting part 120. When flowing through the first heat-conducting part 120, the high-temperature flue gas will exchange heat with it. Since the distance L0 between the heat-conducting surface 121 and the hole wall of the first mounting hole 111 gradually increases along the direction of flue gas flow, the part of the heat-conducting surface 121 that first contacts the high-temperature flue gas is the shortest at the first mounting hole 111. As the flue gas flows, the part in contact with the heat-conducting surface 121 becomes farther and farther away from the first mounting hole 111. Since the flue gas temperature gradually decreases as it flows, the flue gas temperature in the part with the shortest distance from the first mounting hole 111 is ensured to be the highest, and the flue gas temperature in the part with a longer distance from the first mounting hole 111 is second, so that the temperature on the plate body 110 reaches equilibrium, ensuring that the temperature on the heat exchange plate 100 is evenly distributed, avoiding local high temperature on the plate body 110, and thus helping to improve the thermal efficiency and corrosion resistance of the heat exchanger.

[0034] It should be noted that a heat exchanger is a device that converts heat from high-temperature flue gas into heat from water. This heat transfer occurs through the following processes: 1. Heat is transferred to the heat exchange fins 100, which then transfer it to the heat exchange tubes; 2. Heat is transferred directly to the heat exchange tubes. Since the area of ​​the heat exchange fins 100 is generally more than 10 times that of the heat exchange tubes, the primary pathways for heat transfer are: high-temperature flue gas, the heat exchange fins 100, the heat exchange tubes, and water. Therefore, improving the heat transfer between the high-temperature flue gas and the heat exchange fins 100 is crucial to the heat exchange efficiency of the heat exchanger.

[0035] The temperature of the high-temperature flue gas is highest before it contacts the heat exchange plate 100. Therefore, the temperature of the first heat transfer portion 120 that contacts the high-temperature flue gas is highest. As the flue gas flows along the surface of the heat exchange plate 100, the temperature of the flue gas gradually decreases, and the heat exchanged with the first heat transfer portion 120 also gradually decreases. According to Fourier's law (1):

[0036] Φ=λ×dt×A / δ (1)

[0037] Where: Φ is the heat conduction / W; λ is the thermal conductivity coefficient / m·K; dt is the temperature difference k; A is the heat transfer surface area; δ is the material thickness.

[0038] Therefore, once the material type and thickness are determined, the heat conduction amount is proportional to the temperature difference and the heat exchange surface area, respectively. Thus, this embodiment rationally controls the distance between the first heat conducting portion 120 and the first mounting hole 111, ensuring that the flue gas temperature is highest at the portion closest to the first mounting hole 111, and lowest at the portion further from the first mounting hole 111. This balances the temperature across the heat exchange fin 100 and prevents localized high temperatures within the fin 100.

[0039] It should be noted that the first heat conducting part 120 includes two heat conducting surfaces 121 arranged opposite to each other on one side, which should be understood as follows: the first heat conducting part 120 has two heat conducting surfaces 121 with different directions on the left and right relative to the first mounting hole 111. It can also be understood as follows: the first heat conducting part 120 has two heat conducting surfaces 121 with different curvatures on one side, and the connection between the two heat conducting surfaces 121 has an inflection point, where the inflection point is the definition of a mathematical function, also known as an inflection point. Mathematically, it refers to the point where the curve changes its upward or downward direction. Intuitively, the inflection point is the point where the tangent line passes through the curve. At the same time, in order to facilitate the understanding of the flue gas flow direction of this embodiment, Figure 2 For example, the direction of flue gas flow is Figure 2 The S in the figure indicates the direction.

[0040] Specifically, please refer to Figure 2 During the assembly process, the position design of the first heat-conducting part 120 will be consistent or basically consistent with the direction of smoke flow, that is, from the end of the first heat-conducting part 120 away from the sheet body 110 to the end of the first heat-conducting part 120 close to the sheet body 110, the distance L0 between the heat-conducting surface 121 and the hole wall corresponding to the first mounting hole 111 gradually increases along the direction of smoke flow.

[0041] It should also be noted that there are multiple ways to determine the spacing L0 between the thermally conductive surface 121 and the wall of the first mounting hole 111. It is sufficient to be able to qualitatively represent the spacing between the thermally conductive surface 121 and the corresponding wall of the first mounting hole 111. For example, points can be taken on the thermally conductive surface 121 in sequence and tangent lines can be drawn at these points; then, a perpendicular line can be drawn through these points to determine the length of the perpendicular line between the thermally conductive surface 121 and the first mounting hole 111, which can be the spacing L0; alternatively, points can be drawn on the thermally conductive surface 121 and the first mounting hole 111 to divide the points equally; then, corresponding lines can be connected to obtain the length of the connected line, which can also be the spacing L0; alternatively, different straight lines can be drawn outward from the center of the first mounting hole 111, and the length of the straight lines between the thermally conductive surface 121 and the first mounting hole 111 can be the spacing L0, etc.

[0042] For further information, please refer to Figure 1 and Figure 2, the heat-conducting surface 121 is a portion of an elliptical cylinder. The ratio of the short axis to the long axis of the cross-sectional profile of the elliptical cylinder where the heat-conducting surface 121 is located is a first ratio D1, and the first mounting hole 111 is an elliptical hole. The long axis of the first mounting hole 111 is arranged along the direction of flue gas flow, and the ratio of the short axis to the long axis of the first mounting hole 111 is a second ratio D2, and the first ratio D1 is greater than the second ratio D2. Since the long axis of the first mounting hole 111 is arranged along the direction of flue gas flow, and the D1 ratio of the heat-conducting surface 121 is greater than the D2 ratio of the first mounting hole 111, it is ensured that the distance between the heat-conducting surface 121 and the first mounting hole 111 gradually increases along the direction of flue gas flow, making the temperature distribution on the first heat-conducting part 120 more uniform, effectively avoiding the generation of local high temperature, and thus allowing the heat on the first heat-conducting part 120 to be better transferred to the heat exchange tube, which is beneficial to improving the thermal efficiency and corrosion resistance of the heat exchanger.

[0043] For further information, please refer to Figure 1 and Figure 2 The center of the ellipse of the first heat conducting portion 120 coincides with the center of the ellipse of the first mounting hole 111, and the first ratio D1 is 1.25 to 1.5 of the second ratio D2. Thus, this embodiment rationally controls the dimensional parameters between the first heat conducting portion 120 and the first mounting hole 111, ensuring a reasonable spacing between the first heat conducting portion 120 and the first mounting hole 111, ensuring a more uniform temperature distribution in the first heat conducting portion 120 and further improving the heat exchange effect. D1 is the ratio of the semi-minor axis a1 to the semi-major axis b1 of the first heat conducting portion 120; D2 is the ratio of the semi-minor axis a2 to the semi-major axis b2 of the first mounting hole 111.

[0044] In one embodiment, please refer to Figure 1 and Figure 2 The distance L3 between the long axis end point of the first heat conducting part 120 and the long axis end point of the corresponding first mounting hole 111 is 1.5 mm to 3 mm, which reduces the length of the heat exchange plate 100 that first contacts the flue gas, reasonably reduces the temperature of the heat exchange plate 100, and avoids local high temperature of the heat exchange plate 100.

[0045] In one embodiment, please refer to Figure 1There are at least two first heat-conducting parts 120 and at least two first mounting holes 111. The first heat-conducting parts 120 are spaced apart along one side of the sheet body 110, and a first notch 112 is provided between two adjacent first heat-conducting parts 120. The sheet body 110 is provided with a second mounting hole 114 for mounting a heat exchange tube. The second mounting hole 114 is arranged opposite the first notch 112. As can be seen, the second mounting holes 114 and the first mounting holes 111 of this embodiment are staggered. This hinders the flow of high-temperature flue gas on the heat exchange sheet 100, ensuring full contact between the high-temperature flue gas and the heat exchange tube, thereby improving the heat exchange effect between the flue gas and the heat exchange tube. At the same time, the portion between two adjacent first heat-conducting parts 120 is far away from the heat exchange tube and is directly washed by the high-temperature flue gas, which is prone to local high temperatures and intergranular corrosion. Therefore, removing this portion can effectively avoid the generation of local high temperatures, making the temperature of the heat exchange sheet 100 uniform and improving thermal efficiency.

[0046] It should be noted that the relative arrangement of the second mounting hole 114 and the first notch 112 can be understood as: the position of the second mounting hole 114 on the sheet body 110 is opposite to the position of the first notch 112 on the sheet body 110, or it can be understood as: the second mounting hole 114 is located between two adjacent first mounting holes 111.

[0047] Specifically, please refer to Figure 2 The heat conducting surface 121 is an elliptical cylinder, and the second mounting hole 114 is an elliptical hole. The minor axis endpoints of the cross-sectional profile of the elliptical cylinder where the two adjacent heat conducting surfaces 121 are located are respectively connected with an end point of the major axis of the second mounting hole 114 away from the first notch 112 to form a third boundary line 180 and a fourth boundary line 190 respectively. The first notch 112 extends from the third boundary line 180 to the fourth boundary line 190. In this way, while removing the part generating local high temperature, as much area of ​​the heat exchange plate 100 as possible is retained, thereby improving the heat exchange efficiency between the heat exchange plate 100 and the flue gas.

[0048] For further information, please refer to Figure 1, a heat conducting hole 113 is provided on the plate body 110. The heat conducting hole 113 is located between the first notch 112 and the second mounting hole 114. The heat conducting hole 113 extends along the periphery of the second mounting hole 114 and is connected to the first notch 112. Because the area enclosed by the second mounting hole 114 and the two first mounting holes 111 is large and heat is concentrated, it is easy to generate local high temperature and cause crystalline corrosion. Therefore, in this embodiment, a heat conducting hole 113 is provided between the first notch 112 and the second mounting hole 114 to eliminate the high temperature concentration area and ensure a uniform temperature distribution on the heat exchange plate 100. At the same time, through the connection between the first notch 112 and the heat conducting hole 113, the flue gas is guided to the periphery of the second mounting hole 114, so that the flue gas exchanges heat with the plate body 110 around the second mounting hole 114, thereby improving the heat exchange efficiency between the heat exchange plate 100 and the heat exchange tube, which is conducive to improving the overall heat exchange effect of the heat exchanger.

[0049] For further information, please refer to Figure 1 and Figure 2 , a hole wall of the heat conducting hole 113 close to the second mounting hole 114 is a part of an elliptical cylinder. The second mounting hole 114 is an elliptical hole, and the long axis of the second mounting hole 114 is set along the direction of flue gas flow. The ratio D3 of the short axis to the long axis of a hole wall of the heat conducting hole 113 is 1.35 to 1.55 of the ratio D4 of the short axis to the long axis of the second mounting hole 114. Similarly, the distance between a hole wall of the heat conducting hole 113 and the second mounting hole 114 gradually increases along the direction of flue gas flow, so that the heat exchange plate 100 with the shortest spacing contacts the flue gas with a higher temperature, and the heat exchange plate 100 with a longer spacing contacts the flue gas with a lower temperature, balancing the temperature on the heat exchange plate 100, effectively avoiding the heat exchange plate 100 from generating local high temperature, thereby making the temperature on the heat exchange plate 100 uniform, and improving the thermal efficiency and corrosion resistance of the heat exchanger. Wherein, D3 is the ratio of the short semi-axis a3 to the long semi-axis b3 of the heat conducting hole 113 ; and D2 is the ratio of the short semi-axis a4 to the long semi-axis b4 of the second mounting hole 114 .

[0050] Specifically, the conventional heat exchanger 100 and the heat exchanger 100 of this embodiment are subjected to thermal field analysis respectively. Figure 4 and Figure 5 Analysis and comparison show that the temperature distribution on the conventional heat exchanger fin 100 is uneven, with large temperature differences. Furthermore, localized high temperatures, reaching as high as 890°C, occur between the mounting holes and on both sides of the heat exchanger fin 100. However, the heat exchanger fin 100 of the present application has a uniform temperature distribution, with minimal temperature differences across the heat transfer surface 121. There are no localized high temperatures, and the highest temperature on both sides is approximately 630°C.

[0051] In one embodiment, please refer to Figure 2The long-axis endpoint of the first mounting hole 111 near the second mounting hole 114 is a boundary endpoint 1112. The boundary endpoints 1112 on both sides of the first notch 112 are connected to the center of the second mounting hole 114, forming a first boundary line 160 and a second boundary line 170, respectively. The heat conduction holes 113 extend from the first boundary line 160 to the second boundary line 170. This effectively removes the areas generating localized high temperatures while retaining more of the plate body 110, ensuring uniform temperature and higher thermal efficiency for the heat exchange plate 100.

[0052] It should be noted that the major axis endpoints are the points where the major axis of the ellipse intersects the elliptic curve respectively; the minor axis endpoints are the points where the minor axis of the ellipse intersects the elliptic curve respectively.

[0053] In one embodiment, please refer to Figure 1 The sheet body 110 is provided with a guide edge 131. The guide edge 131 is arranged around the periphery of the second mounting hole 114 and is provided with a second notch 132 for exhausting the flue gas. In this way, the guide edge 131 changes the flow direction of the high-temperature flue gas, allowing the flue gas to directly contact the heat exchange tubes, thereby increasing the contact time between the flue gas and the heat exchange tubes and effectively improving the heat exchange efficiency of the heat exchanger.

[0054] For further information, please refer to Figure 1 At least two second heat-conducting parts 130 are provided on the side of the sheet body 110 away from the first heat-conducting part 120. The second heat-conducting parts 130 surround the periphery of the second mounting hole 114, and the guiding edge 131 extends along the edge of the second heat-conducting part 130. In this way, the flue gas is guided to the heat exchange tube in the second mounting hole 114 as much as possible before flowing out of the heat exchange sheet 100, so as to increase the heat exchange time between the flue gas and the heat exchange tube.

[0055] In one embodiment, please refer to Figure 1 First flanges 140 are provided at opposite ends of the fin body 110. The distance L1 between the first flanges 140 and the center of adjacent first mounting holes 111 is less than half the distance L2 between the centers of two adjacent first mounting holes 111. Thus, the first flanges 140 maintain a certain distance between two stacked heat exchange fins 100, ensuring the consistency of the fins 100 within the heat exchanger. This also reduces the flue gas flow from the first flanges 140 on both sides to the nearest heat exchange tube, increasing the airflow between the fins 100 and improving the thermal efficiency of the heat exchanger.

[0056] In one embodiment, please refer to Figure 1 The sheet body 110 is further provided with a second flange 1111. The second flange 1111 is provided around the edge of the first mounting hole 111. This not only helps to increase the welding area between the heat exchange sheet 100 and the heat exchange tube, but also helps to improve the heat exchange efficiency between the two.

[0057] Specifically, the sheet body 110 is further provided with a third flange 1141 , which is arranged around the edge of the second mounting hole 114 .

[0058] In one embodiment, please refer to Figure 2 and Figure 3 The sheet body 110 is provided with a guide portion 150. The guide portion 150 is located between one end of the sheet body 110 and the first mounting hole 111. In this way, the flue gas flow from both sides of the heat exchange sheet 100 to the nearest heat exchange tube is further reduced, the gas flow in the middle is increased, and the thermal efficiency is improved. The guide portion 150 can be a flange structure or a flange hole structure. The flange structure is a sheet structure bent on the sheet body 110 to form an L-shaped structure. Please refer to Figure 3 ; The flange hole structure is cylindrical, please refer to Figure 2 Of course, a guide portion 150 is also provided between one side of the plate body 110 and the second mounting hole 114, which similarly reduces the flue gas flow from both sides of the heat exchange plate 100 to the nearest heat exchange tube and increases the gas flow in the middle.

[0059] In one embodiment, please refer to Figure 1 and Figure 2 A heat exchanger includes a heat exchange shell, heat exchange tubes, and a heat exchange plate 100 according to any of the above embodiments. The plate body 110 is mounted within the heat exchange shell, with the first heat conducting portion 120 facing the smoke inlet of the heat exchange shell. The heat exchange tubes are inserted into the first mounting holes 111.

[0060] The above-mentioned heat exchanger uses the above-mentioned heat exchange plate 100. During use, the plate body 110 is installed in the heat exchange shell of the heat exchanger so that the first heat-conducting part 120 is arranged toward the smoke inlet of the heat exchange shell; and then the heat exchange tube is fixed in the first mounting hole 111. At this time, the high-temperature flue gas entering the heat exchange shell contacts the first heat-conducting part 120 and flows through the first heat-conducting part 120. When flowing through the first heat-conducting part 120, the high-temperature flue gas will exchange heat with it. Since the distance L0 between the heat-conducting surface 121 and the hole wall of the first mounting hole 111 gradually increases along the direction of flue gas flow, the part of the heat-conducting surface 121 that first contacts the high-temperature flue gas is the shortest at the first mounting hole 111. As the flue gas flows, the part in contact with the heat-conducting surface 121 becomes farther and farther away from the first mounting hole 111. Since the flue gas temperature gradually decreases as it flows, the flue gas temperature in the part with the shortest distance from the first mounting hole 111 is ensured to be the highest, and the flue gas temperature in the part with a longer distance from the first mounting hole 111 is second, so that the temperature on the plate body 110 reaches equilibrium, ensuring that the temperature on the heat exchange plate 100 is evenly distributed, avoiding local high temperature on the plate body 110, and thus helping to improve the thermal efficiency and corrosion resistance of the heat exchanger.

[0061] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0062] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "periphery", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0064] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0066] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0067] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

Claims

1. A heat exchange plate (100), characterized in that: The heat exchange plate (100) comprises a plate body (110), a first heat conducting portion (120) is provided on one side of the plate body (110), the first heat conducting portion (120) is used to be arranged toward the smoke inlet of the heat exchange shell, a first mounting hole (111) for mounting a heat exchange tube is provided on the plate body (110), the first heat conducting portion (120) is arranged around the first mounting hole (111), and the side of the first heat conducting portion (120) facing away from the first mounting hole (111) comprises two heat conducting surfaces (121) arranged opposite to each other, and a distance L0 between the heat conducting surface (121) and the hole wall corresponding to the first mounting hole (111) gradually increases along the direction of smoke flow; There are at least two of the first heat-conducting parts (120) and the first mounting holes (111). The first heat-conducting parts (120) are arranged at intervals along one side of the sheet body (110), and a first notch (112) is provided between two adjacent first heat-conducting parts (120). The sheet body (110) is provided with a second mounting hole (114) for mounting the heat exchange tube, and the second mounting hole (114) is arranged opposite to the first notch (112). The sheet body (110) is provided with a heat conducting hole (113), the heat conducting hole (113) is located between the first notch (112) and the second mounting hole (114), the heat conducting hole (113) is extended along the periphery of the second mounting hole (114), and the heat conducting hole (113) is communicated with the first notch (112); The heat-conducting surface (121) is a portion of an elliptical cylinder, the first mounting hole (111) is an elliptical hole, a long axis endpoint of the first mounting hole (111) close to the second mounting hole (114) is a boundary endpoint (1112), the boundary endpoints (1112) on both sides of the first notch (112) are connected to the center line of the second mounting hole (114), and respectively form a first boundary line (160) and a second boundary line (170), and the heat-conducting hole (113) extends from the first boundary line (160) to the second boundary line (170).

2. The heat exchange fin (100) according to claim 1, characterized in that: The ratio of the short axis to the long axis of the cross-sectional profile of the elliptical cylinder where the heat-conducting surface (121) is located is a first ratio D1, the long axis of the first mounting hole (111) is arranged along the direction of flow of the flue gas, the ratio of the short axis to the long axis of the first mounting hole (111) is a second ratio D2, and the first ratio D1 is greater than the second ratio D2.

3. The heat exchange fin (100) according to claim 2, characterized in that: The ellipse center of the first heat conducting portion (120) coincides with the ellipse center of the first mounting hole (111), and the first ratio D1 is 1.25 to 1.5 of the second ratio D2.

4. The heat exchange fin (100) according to claim 2, characterized in that: The minor axis endpoints of the cross-sectional profile of the elliptical cylinder where two adjacent heat-conducting surfaces (121) are located are respectively connected to an end point of the major axis of the second mounting hole (114) away from the first notch (112) to form a third boundary line (180) and a fourth boundary line (190), respectively; the first notch (112) extends from the third boundary line (180) to the fourth boundary line (190).

5. The heat exchange fin (100) according to claim 2, characterized in that: A hole wall of the heat conducting hole (113) close to the second mounting hole (114) is a part of an elliptical cylinder, the second mounting hole (114) is an elliptical hole, the major axis of the second mounting hole (114) is arranged along the flow direction of the flue gas, and a ratio D3 of the minor axis to the major axis of a hole wall of the heat conducting hole (113) is 1.35 to 1.55 of a ratio D4 of the minor axis to the major axis of the second mounting hole (114).

6. The heat exchange fin (100) according to claim 2, characterized in that: The sheet body (110) is provided with a guide edge (131), the guide edge (131) is arranged around the periphery of the second mounting hole (114), and the guide edge (131) is provided with a second notch (132) for exhausting smoke.

7. The heat exchange fin (100) according to claim 6, characterized in that: At least two second heat-conducting parts (130) are provided on a side of the sheet body (110) away from the first heat-conducting part (120), the second heat-conducting parts (130) surround the periphery of the second mounting hole (114), and the guide edge (131) is extended along the edge of the second heat-conducting part (130).

8. The heat exchange fin (100) according to any one of claims 1 to 7, characterized in that: The sheet body (110) is provided with first flanges (140) at opposite ends, and a distance L1 between the first flanges (140) and the center of adjacent first mounting holes (111) is less than half of a distance L2 between the centers of two adjacent first mounting holes (111).

9. The heat exchange fin (100) according to any one of claims 1 to 7, characterized in that: The sheet body (110) is further provided with a second flange (1111), and the second flange (1111) is arranged around the edge of the first mounting hole (111).

10. A heat exchanger, characterized in that: It comprises a heat exchange shell, a heat exchange tube and a heat exchange plate (100) according to any one of claims 1 to 9, wherein the plate body (110) is installed in the heat exchange shell, and the first heat conducting portion (120) faces the smoke inlet of the heat exchange shell, and the heat exchange tube is inserted into the first mounting hole (111).

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