Heat exchanger for gas water heater

Abstract

The present invention relates to a heat exchange plate for a water heater, including a main board. On the one hand, two first spoiler flanges divide the high-temperature flue gas flowing between two adjacent first heat exchange holes into three parts, and the high-temperature flue gas flowing in the first channel can continue to flow forward to exchange heat with the walls of the heat exchange tubes in other rows of heat exchange holes; on the other hand, after the high-temperature flue gas contacts and exchanges heat with the heat exchange tubes and heat exchange plates of the first heat exchange holes, the temperature of the high-temperature flue gas will gradually decrease, and the volume will become smaller. If the flow rate is in a channel of the same size, it will become slower. However, the gradually narrowing second channel can keep the flow rate of the high-temperature flue gas relatively stable, which is conducive to maintaining a relatively high convection heat transfer coefficient, thereby achieving an enhanced heat exchange effect, and at the same time, it is also conducive to blowing away the dust particles generated by combustion, thereby ensuring that the second channel is unobstructed and maintaining the heat exchange effect. It can be seen that the heat exchange efficiency can be effectively improved, and materials can be saved and costs can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gas water heaters, and in particular to a heat exchange plate used for gas water heaters. Background Art

[0002] With the development of social economy, the energy-saving requirements of gas water heaters (including household gas water heaters and wall-mounted boilers) are getting higher and higher. The heat exchanger is the core component of the gas water heater and plays a key role in the utilization rate of gas. As the core part of the heat exchanger, the heat exchanger directly affects the heat exchange efficiency of the heat exchanger. The material utilization rate of the heat exchanger used in some heat exchangers on the market is not high, and the heat exchange efficiency is low; in order to improve the heat exchange efficiency, some heat exchangers on the market mainly increase the heat exchange efficiency by increasing the heat exchanger material, but this will increase the production cost of the heat exchanger. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a heat exchange plate for a gas water heater, which can effectively improve the heat exchange efficiency, save materials and reduce costs.

[0004] The above technical problems are solved by the following technical solutions:

[0005] A heat exchange plate for a gas water heater, the heat exchange plate comprising: a main board, the main board being divided into an air inlet end and an exhaust end according to the flow direction of the airflow at the pre-installed position, the main board being provided with a first row of heat exchange holes, the first row of heat exchange holes comprising at least two first heat exchange holes arranged in sequence at intervals, the first heat exchange holes being used to install heat exchange tubes, the main board being further provided with two first spoiler flanges located between two adjacent first heat exchange holes, the two first spoiler flanges being arranged at intervals to form a first channel; the first spoiler flange being used to cooperate with the wall of the heat exchange tube in the first heat exchange hole adjacent to it to form a second channel, the width of the second channel gradually decreasing along the flow direction of the airflow.

[0006] The heat exchanger plate for gas water heaters described in the present invention has the following beneficial effects compared with the background technology: after stacking and assembling two or more heat exchanger plates to form a heat exchange device, a flue gas channel is formed between two adjacent heat exchanger plates, and the high-temperature flue gas contacts and conducts heat with the heat exchange tube during the process of flowing through the flue gas channel. Since the main board is also provided with two first spoiler flanges located between two adjacent first heat exchange holes, the two first spoiler flanges are arranged at intervals to form a first channel, and the first spoiler flange is used to cooperate with the wall of the heat exchange tube in the adjacent first heat exchange hole to form a second channel, and the width of the second channel gradually decreases along the flow direction of the airflow. In this way, on the one hand, the two first spoiler flanges divide the high-temperature flue gas flowing between the two adjacent first heat exchange holes into three parts, one part of which flows through the first channel, and the other two parts of which flow through the second channel formed by the two first spoiler flanges and the walls of the heat exchange tubes in the adjacent first heat exchange holes. The high-temperature flue gas flowing through the second channel can better exchange heat with the heat exchange tubes installed in the first heat exchange holes, and the high-temperature flue gas flowing through the first channel can continue to flow forward and exchange heat with the walls of the heat exchange tubes in other rows of heat exchange holes; on the other hand, after the high-temperature flue gas contacts and exchanges heat with the heat exchange tubes and heat exchange plates of the first heat exchange holes, the temperature of the high-temperature flue gas will gradually decrease, and the volume will become smaller. If the flow rate is slow in the channel of the same size, however, the gradually narrowing second channel can keep the flow rate of the high-temperature flue gas relatively stable, which is conducive to maintaining a relatively high convection heat transfer coefficient, thereby achieving an enhanced heat exchange effect, and is also conducive to blowing away the dust particles generated by combustion, thereby ensuring that the second channel is unobstructed and maintaining the heat exchange effect. It can be seen that the heat exchange efficiency can be effectively improved, and materials can be saved and costs can be reduced.

[0007] In one embodiment, the first spoiler flange is an arc-shaped flange; the center of the first spoiler flange and the first heat exchange hole adjacent to the first spoiler flange are located on the same side of the first spoiler flange, and the center of the first spoiler flange is closer to the air inlet end than the center of the first heat exchange hole.

[0008] In one embodiment, the end of the first spoiler flange away from the air inlet end is the first end, and the end of the first spoiler flange close to the air inlet end is the second end; the distance from the intersection of the first end and the center of the first heat exchange hole adjacent to the first end with the edge of the first heat exchange hole to the first end is a; the distance from the intersection of the second end and the center of the first heat exchange hole adjacent to the second end with the edge of the first heat exchange hole to the second end is b; wherein a is less than b; the ratio of a to b is 0.7-0.9; and / or the distance between two adjacent second ends is n, and the ratio of b to n is 0.8-1.0.

[0009] In one of the embodiments, a first opening is provided on the main board in an area corresponding to the area between two first spoiler flanges located between two adjacent first heat exchange holes.

[0010] In one of the embodiments, a second opening corresponding to and connected to the first opening is further provided in an area between two adjacent first heat exchange holes on the main board, and the second opening is closer to the air inlet end than the first opening.

[0011] In one embodiment, a straight line passing through the centers of at least two of the first heat exchange holes is defined as a first auxiliary line; the end of the first spoiler flange away from the air inlet end is a first end, and the end of the first spoiler flange close to the air inlet end is a second end; a line connecting the first end and the center of the first heat exchange hole adjacent to the first end is defined as a first connecting line, and the first connecting line forms an angle r with the first auxiliary line; a line connecting the second end and the center of the first heat exchange hole adjacent to the second end is defined as a second connecting line, and the second connecting line forms an angle p with the first auxiliary line; wherein, 27°≦r≦40°, -5°≦p≦5°.

[0012] In one of the embodiments, a second row of heat exchange holes is further provided on the main board, and the second row of heat exchange holes is closer to the exhaust end than the first row of heat exchange holes. The second row of heat exchange holes includes at least two second heat exchange holes arranged in sequence and spaced apart from each other, and the second heat exchange holes are used to install heat exchange tubes. The main board is also provided with two second spoiler flanges located between two adjacent second heat exchange holes; the spacing between the two second spoiler flanges gradually increases in the direction from the intake end to the exhaust end; the second spoiler flange is used to cooperate with the wall of the heat exchange tube in the second heat exchange hole adjacent to it to form a third channel.

[0013] In one of the embodiments, a straight line passing through the centers of at least two of the second heat exchange holes is defined as a second auxiliary line; the end of the second spoiler flange away from the air inlet end is a third end, and the end of the second spoiler flange close to the air inlet end is a fourth end; the third end and the fourth end are respectively located on both sides of the second auxiliary line, and the fourth end is closer to the air inlet end relative to the second auxiliary line.

[0014] In one embodiment, the second spoiler flange includes a first arc-shaped flange and a second arc-shaped flange connected to each other, the first arc-shaped flange is closer to the exhaust end than the second arc-shaped flange; the center of the first arc-shaped flange and the second heat exchange hole adjacent to the second spoiler flange are both located on the same side of the second spoiler flange, and the center of the first arc-shaped flange is closer to the intake end than the center of the second heat exchange hole; the center of the second arc-shaped flange and the second heat exchange hole adjacent to the second spoiler flange are respectively located on different sides of the second spoiler flange.

[0015] In one of the embodiments, the end of the second spoiler flange away from the air inlet end is the third end, and the end of the second spoiler flange close to the air inlet end is the fourth end; the distance from the intersection of the third end and the center of the second heat exchange hole adjacent to the third end with the edge of the second heat exchange hole to the third end is c; the distance from the intersection of the fourth end and the center of the second heat exchange hole adjacent to the fourth end with the edge of the second heat exchange hole to the fourth end is d; wherein, c is smaller than d, and the width of the third channel gradually decreases along the flow direction of the airflow.

[0016] In one embodiment, the ratio of c to d is 0.6-0.8.

[0017] In one of the embodiments, the opposite side edges of the main board are provided with third spoiler flanges, and the third spoiler flanges are provided with a first exhaust port; the two spoiler flanges adjacent to the two sides of the second heat exchange hole are spaced apart at one end close to the exhaust end to form a second exhaust port; the two second spoiler flanges located at two adjacent second heat exchange holes are spaced apart at one end away from the exhaust end to form a third exhaust port.

[0018] In one embodiment, the distance between two second spoiler flanges located at two adjacent second heat exchange holes and one end away from the exhaust end is e, and the ratio of e to d is 0.6-0.8.

[0019] In one of the embodiments, a first guide flange is provided on the main board, and the first guide flange is located at the air outlet end of the second channel; a second guide flange is also provided on the main board, and the second guide flange is located in the area between one end of the first spoiler flange close to the air inlet end and the first smoke exhaust port.

[0020] In one embodiment, the number of first heat exchange holes in the first row of heat exchange holes is one more than the number of heat exchange holes in the second row, and the first heat exchange holes in the first row of heat exchange holes and the second heat exchange holes in the second row of heat exchange holes are alternately arranged in the direction from the air inlet end to the exhaust end. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] 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.

[0023] Figure 1 A schematic structural diagram of a heat exchange plate according to an embodiment of the present invention from one viewing angle;

[0024] Figure 2 A top view of a heat exchanger fin according to an embodiment of the present invention;

[0025] Figure 3 A top view of a heat exchange fin according to another embodiment of the present invention;

[0026] Figure 4 FIG. 4 is a top view of a heat exchange fin according to another embodiment of the present invention.

[0027] Reference numerals:

[0028] 10. Main board; 11. First heat exchange hole; 111. First auxiliary line; 12. First spoiler flange; 131. First channel; 132. Second channel; 133. Third channel; 134. Fourth channel; 135. Fifth channel; 141. First connecting line; 142. Second connecting line, 143. Third connecting line; 144. Fourth connecting line; 151. First opening; 152. Second opening; 153. Third opening; 16. Second heat exchange hole; 161. Second auxiliary line; 17. Second spoiler flange; 171. First arc flange; 172. Second arc flange; 18. Third spoiler flange; 181. First exhaust port; 182. Second exhaust port; 183. Third exhaust port; 191. First guide flange; 192. Second guide flange; 193. First positioning flange; 194. Process through hole. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0030] See also Figure 1 and Figure 2 , Figure 1 A schematic structural diagram of a heat exchange plate according to an embodiment of the present invention from one viewing angle is shown. Figure 2 FIG. 1 shows a top view of a heat exchanger according to an embodiment of the present invention. An embodiment of the present invention provides a heat exchanger, which includes a main board 10. The main board 10 is divided into an air inlet end (such as Figure 2 The lower end of the main board 10 shown in FIG. Figure 2 The main board 10 is provided with a first row of heat exchange holes (e.g. Figure 2 The first row of heat exchange holes includes at least two first heat exchange holes 11 arranged in sequence at intervals. The first heat exchange holes 11 are used to install heat exchange tubes. The main board 10 is also provided with two first spoiler flanges 12 located between two adjacent first heat exchange holes 11. The two first spoiler flanges 12 are arranged at intervals to form a first channel 131. The first spoiler flange 12 is used to cooperate with the wall of the heat exchange tube in the adjacent first heat exchange hole 11 to form a second channel 132. The width of the second channel 132 gradually decreases along the flow direction of the airflow.

[0031] It should be noted that the first spoiler flange 12 is used to cooperate with the wall of the heat exchange tube in the adjacent first heat exchange hole 11 to form the second channel 132 , and the “it” here refers to the first spoiler flange 12 .

[0032] After stacking and assembling two or more heat exchanger sheets to form a heat exchange device, a flue gas channel is formed between two adjacent heat exchanger sheets, and the high-temperature flue gas contacts and conducts heat with the heat exchange tube during the process of flowing through the flue gas channel. Since the main board 10 is also provided with two first spoiler flanges 12 located between two adjacent first heat exchange holes 11, the two first spoiler flanges 12 are arranged at intervals to form a first channel 131, and the first spoiler flanges 12 are used to cooperate with the heat exchange tube wall in the adjacent first heat exchange hole 11 to form a second channel 132, and the width of the second channel 132 gradually decreases along the flow direction of the airflow. In this way, on the one hand, the two first spoiler flanges 12 divide the high-temperature flue gas flowing between the two adjacent first heat exchange holes 11 into three parts, one part of the high-temperature flue gas flows in the first channel 131, and the other two parts of the high-temperature flue gas flow in the second channel 132 formed by the two first spoiler flanges 12 and the walls of the heat exchange tubes in the respective adjacent first heat exchange holes 11. The high-temperature flue gas flowing in the second channel 132 can better exchange heat with the heat exchange tubes installed in the first heat exchange holes 11, and the high-temperature flue gas flowing in the first channel 131 can continue to flow forward and exchange heat with the walls of the heat exchange tubes in other rows of heat exchange holes; on the other hand, after the high-temperature flue gas contacts and exchanges heat with the heat exchange tubes and heat exchange plates of the first heat exchange holes 11, the temperature of the high-temperature flue gas will gradually decrease and the volume will decrease. If the flow rate is in a channel of the same size, it will slow down. However, the gradually narrowing second channel 132 can keep the flow rate of the high-temperature flue gas relatively stable, which is conducive to maintaining a relatively high convection heat transfer coefficient, thereby achieving an enhanced heat transfer effect, and is also conducive to blowing away the dust particles generated by combustion, thereby ensuring that the second channel 132 is unobstructed and maintaining the heat transfer effect. It can be seen that the heat exchange efficiency can be effectively improved, and materials can be saved and costs can be reduced.

[0033] See also Figure 1 and Figure 2 , further, the first spoiler flange 12 is an arc-shaped flange. Optionally, the first spoiler flange 12 can also be a straight flange, or a spoiler flange combining a straight flange and an arc-shaped flange, which is not specifically limited here. When the first spoiler flange 12 is an arc-shaped flange, the high-temperature flue gas flowing in the second channel 132 can better exchange heat with the heat exchange tube installed in the first heat exchange hole 11.

[0034] See also Figure 1 and Figure 2 , further, the center of the first spoiler flange 12 and the first heat exchange hole 11 adjacent to the first spoiler flange 12 are located on the same side of the first spoiler flange 12, and the center of the first spoiler flange 12 is closer to the air inlet end than the center of the first heat exchange hole 11. Specifically, the direction of the line connecting the center of the first spoiler flange 12 and the center of the first heat exchange hole 11 is consistent with the direction from the air inlet end to the exhaust end.

[0035] Of course, it is understandable that, as an optional solution, the center of the first spoiler flange 12 and the center of the first heat exchange hole 11 may overlap with each other, or the center of the first spoiler flange 12 may be farther away from the air intake end than the center of the first heat exchange hole 11.

[0036] The end of the first spoiler flange 12 away from the air inlet end is the first end, and the end of the first spoiler flange 12 close to the air inlet end is the second end.

[0037] Optionally, the distance between the first end and the first connecting line 141 of the center of the first heat exchange hole 11 adjacent to the first end and the intersection with the edge of the first heat exchange hole 11 to the first end is a; the distance between the second end and the second end and the intersection with the edge of the first heat exchange hole 11 to the second end is b. Where a is smaller than b.

[0038] Generally speaking, if the ratio of a to b is too large, a portion of the high-temperature flue gas in the second channel 132 along the airflow direction will be discharged out of the second channel 132 before contacting the heat exchange tube, resulting in insufficient heat exchange, unsatisfactory heat exchange effect, and failure to achieve the ideal heat exchange convection coefficient, thus affecting the enhanced heat exchange effect; if the ratio of a to b is too small, the second channel 132 will be too narrow, the smoke resistance will be too large, and the smoke exhaust will be poor, resulting in poor combustion conditions and poor local heat exchange effect.

[0039] Furthermore, the ratio of a to b is 0.7-0.9. In this way, the range of the ratio of a to b is relatively suitable, which can achieve sufficient heat exchange between the high-temperature flue gas in the second channel 132 and the heat exchange tube, with a good heat exchange effect and smooth smoke exhaust. Specifically, the ratio of a to b is, for example, 0.7, 0.8 or 0.9, etc., which is not limited here and can be set according to actual conditions.

[0040] Generally speaking, the spacing between two adjacent first ends is m, and the spacing between two adjacent second ends is n. If the values ​​of m and n are too large, the amount of smoke diverted to the heat exchange tubes installed on the remaining rows of heat exchange holes (for example, the heat exchange tubes of the second row of heat exchange holes) will be too large, and part of the smoke will not be able to exchange heat with the heat exchange tubes of the second row of heat exchange holes in time and will flow to the smoke exhaust port; at the same time, the amount of smoke diverted to the second channel 132 is relatively reduced, resulting in too small a heat exchange rate between the heat exchange tubes of the first row of heat exchange holes and the smoke in the first channel 131. On the contrary, if the values ​​of m and n are too small, the amount of smoke diverted to the heat exchange tubes of the second row of heat exchange holes will be too small, resulting in too small a heat exchange rate between the smoke on both sides of the heat exchange tubes of the second row of heat exchange holes and the heat exchange tubes. At the same time, the amount of smoke diverted to the second channel 132 will be too large, and the smoke in the second channel 132 will not be able to exchange heat with the heat exchange tubes of the first row of heat exchange holes in time and will flow to the smoke exhaust port.

[0041] In one embodiment, the spacing between two adjacent second ends is n, and the ratio of b to n is 0.8-1.0. In this way, the airflow passing between two adjacent first heat exchange holes 11 can be relatively reasonably divided into three parts. The airflow on both sides enters the second channel 132 and the side of the heat exchange tube of the first heat exchange hole 11 along the first spoiler flange 12, and fully exchanges heat with the leeward side of the heat exchange tube under the action of the first spoiler flange 12. The middle part of the airflow flows through the first channel 131. In addition, after the middle part of the airflow passes through the first channel 131, it can continue to flow forward and exchange heat with the walls of the heat exchange tubes in other rows of heat exchange holes. Specifically, the ratio of b to n is, for example, 0.8, 0.9 or 1.0, etc., which is not limited here and can be set according to actual conditions.

[0042] As an example, the diameter of the first heat exchange hole 11 or the second heat exchange hole 16 is k, and the ratio of m to k is, for example, 0.9-1.1.

[0043] In one embodiment, a first opening 151 is provided on the main board 10 in an area corresponding to the area between the two first spoiler flanges 12 located between two adjacent first heat exchange holes 11. Thus, on the one hand, the area between the two first spoiler flanges 12 on the main board 10 is provided to form the first opening 151, that is, there is no sheet material at the first opening 151 and it is hollow, thereby saving the material of the heat exchange plate and reducing the cost; on the other hand, since there is no sheet material at the first opening 151, the high-temperature flue gas will not be heated to form a high-temperature area due to the presence of the sheet material when passing through, thereby extending the service life of the heat exchange plate.

[0044] It should be noted that the first spoiler flange 12 is specifically formed by folding the sheet material at the first opening 151, that is, the first spoiler flange 12 and the main board 10 are made into an integrated structure, and then folded to form a spoiler flange while forming the first opening 151 on the main board 10. Of course, as an optional solution, the first opening 151 can be directly formed on the main board 10, and the first spoiler flange 12 can be welded on the main board 10, or the first spoiler flange 12 can be installed at the edge of the first opening 151 by using connectors such as screws, bolts, and clamps, which are not limited here.

[0045] Since the distance between the two first spoiler flanges 12 gradually increases in the direction from the air intake end to the exhaust end, that is, the opening width of the first opening 151 gradually increases in the direction from the air intake end to the exhaust end, the shape of the first opening 151 is similar to an inverted figure eight. Among them, the opening width of the first opening 151 corresponds to the width of the first channel 131, that is, the distance between the two first spoiler flanges 12.

[0046] See also Figure 1 and Figure 2In one embodiment, the area between two adjacent first heat exchange holes 11 on the main board 10 is also provided with a second opening 152 corresponding to and connected to the first opening 151. The second opening 152 is closer to the air inlet end than the first opening 151. In this way, on the one hand, the area between the two first heat exchange holes 11 on the main board 10 is opened to form the second opening 152, that is, there is no sheet material at the second opening 152 and it is hollow, so that the material of the heat exchange plate can be saved and the cost can be reduced; on the other hand, since there is no sheet material at the second opening 152, the high-temperature flue gas will not be heated to form a high-temperature area due to the presence of the sheet material when passing through, so that the service life of the heat exchange plate can be extended. Specifically, the opening width of the second opening 152 gradually decreases in the direction from the air inlet end to the exhaust end. Of course, the opening width of the second opening 152 can also remain unchanged, or gradually increase in the direction from the air inlet end to the exhaust end, which is not limited here.

[0047] As an optional solution, the area between two adjacent first heat exchange holes 11 on the main board 10 does not need to be provided with the first opening 151 and / or the second opening 152 .

[0048] In one embodiment, the main board 10 is further provided with a second row of heat exchange holes (such as Figure 2 The second row of heat exchange holes is closer to the exhaust end than the first row of heat exchange holes, and the second row of heat exchange holes includes at least two second heat exchange holes 16 arranged in sequence. The second heat exchange holes 16 are used to install heat exchange tubes. The main board 10 is also provided with two second spoiler flanges 17 located between two adjacent second heat exchange holes 16. The spacing between the two second spoiler flanges 17 gradually increases in the direction from the intake end to the exhaust end. The second spoiler flange 17 is used to cooperate with the wall of the heat exchange tube in the adjacent second heat exchange hole 16 to form a third channel 133.

[0049] It should be noted that the second spoiler flange 17 is used to cooperate with the wall of the heat exchange tube in the adjacent second heat exchange hole 16 to form the third channel 133 , and the “it” here refers to the second spoiler flange 17 .

[0050] In this way, after the high-temperature flue gas contacts and exchanges heat with the heat exchange tube and heat exchange plate installed in the second heat exchange hole 16, the temperature of the high-temperature flue gas will gradually decrease, and the volume will become smaller. If it is in a channel of the same size, the flow rate will be slower. However, the gradually narrowing third channel 133 can keep the flow rate of the high-temperature flue gas relatively stable, which is conducive to maintaining a relatively high convection heat transfer coefficient, thereby achieving an enhanced heat exchange effect, and at the same time, it is also conducive to blowing away the dust particles generated by combustion, thereby ensuring that the third channel 133 is unobstructed and maintaining the heat exchange effect.

[0051] It should be noted that the second spoiler flange 17 can be a straight flange, a curved flange, a combination of a straight flange and a straight flange, a combination of a curved flange and a curved flange, a combination of a straight flange and a curved flange, etc., which is not limited here.

[0052] In one embodiment, the second spoiler flange 17 includes a first arc-shaped flange 171 and a second arc-shaped flange 172 connected to each other. The first arc-shaped flange 171 is closer to the exhaust end than the second arc-shaped flange 172. The center of the first arc-shaped flange 171 and the second heat exchange hole 16 adjacent to the second spoiler flange 17 are both located on the same side of the second spoiler flange 17, and the center of the first arc-shaped flange 171 is closer to the intake end than the center of the second heat exchange hole 16. The center of the second arc-shaped flange 172 and the second heat exchange hole 16 adjacent to the second spoiler flange 17 are respectively located on different sides of the second spoiler flange 17. That is, the center of the second arc-shaped flange 172 is located on one side of the second spoiler flange 17, and the second heat exchange hole 16 adjacent to the second spoiler flange 17 is located on the other side of the second spoiler flange 17.

[0053] The end of the second spoiler flange 17 away from the air inlet end is the third end, and the end of the second spoiler flange 17 close to the air inlet end is the fourth end.

[0054] Optionally, the distance between the third end and the third connecting line 143 of the center of the second heat exchange hole 16 adjacent to the third end and the intersection with the edge of the second heat exchange hole 16 to the third end is c; the distance between the fourth end and the fourth connecting line 144 of the center of the second heat exchange hole 16 adjacent to the fourth end and the intersection with the edge of the second heat exchange hole 16 to the fourth end is d. Among them, c is smaller than d, and the width of the third channel 133 gradually decreases along the flow direction of the airflow. In this way, after the high-temperature flue gas contacts and exchanges heat with the heat exchange tube and heat exchange plate of the second heat exchange hole 16, the temperature of the high-temperature flue gas will gradually decrease, the volume will decrease, and the flow rate will slow down if it is in a channel of the same size. However, the gradually narrowing third channel 133 can keep the flow rate of the high-temperature flue gas relatively stable, which is conducive to maintaining a relatively high convective heat transfer coefficient, thereby achieving an enhanced heat exchange effect, and is also conducive to blowing away the dust particles generated by combustion, thereby ensuring that the third channel 133 is unobstructed and maintaining the heat exchange effect.

[0055] Generally speaking, if the ratio of c to d is too large, a portion of the high-temperature flue gas in the third channel 133 along the airflow direction will be discharged out of the third channel 133 before contacting the heat exchange tube, resulting in insufficient heat exchange, unsatisfactory heat exchange effect, and failure to achieve the ideal heat exchange convection coefficient, thus affecting the enhanced heat exchange effect; if the ratio of c to d is too small, the third channel 133 will be too narrow, the smoke resistance will be too large, the smoke exhaust will be poor, resulting in poor combustion conditions and poor local heat exchange effect.

[0056] Furthermore, the ratio of c to d is 0.6-0.8. In this way, the range of the ratio of c to d is relatively suitable, which can achieve sufficient heat exchange between the high-temperature flue gas in the third channel 133 and the heat exchange tube, with a good heat exchange effect and smooth smoke exhaust. Specifically, the ratio of c to d is, for example, 0.6, 0.7 or 0.8, etc., which is not limited here and can be set according to actual conditions.

[0057] See also Figure 2 , further, a straight line passing through the centers of at least two first heat exchange holes 11 is defined as a first auxiliary line 111. The end of the first spoiler flange 12 away from the air inlet end is the first end, and the end of the first spoiler flange 12 close to the air inlet end is the second end; the line connecting the first end and the center of the first heat exchange hole 11 adjacent to the first end is defined as a first connecting line 141, and the first connecting line 141 forms an angle r with the first auxiliary line 111. In addition, the line connecting the second end and the center of the first heat exchange hole 11 adjacent to the second end is defined as a second connecting line 142, and the second connecting line 142 forms an angle p with the first auxiliary line. Among them, 27°≦r≦40°, -5°≦p≦5°.

[0058] It should be noted that when p is a negative number less than 0, such as -1°, -3° or -5°, it indicates that the second end is closer to the air inlet end relative to the first auxiliary line 111. Figure 2 As shown, the second connecting line 142 is located below the first auxiliary line 111, and at this time the second connecting line 142 is closer to the air inlet end relative to the first auxiliary line 111. On the contrary, when p is a positive number greater than 0, such as 1°, 3° or 5°, it indicates that the second end is further away from the air inlet end relative to the first auxiliary line 111, that is, at this time, the second connecting line 142 is located above the first auxiliary line 111, and at this time the second connecting line 142 is further away from the air inlet end relative to the first auxiliary line 111.

[0059] Thus, the first spoiler flange 12 is arranged in this way, under the action of the first spoiler flange 12, the high-temperature flue gas can be gathered more in the second channel 132, and fully exchange heat with the wall of the heat exchange tube installed in the first heat exchange hole 11, which can greatly improve the heat exchange effect.

[0060] Furthermore, a straight line passing through the centers of at least two second heat exchange holes 16 is defined as a second auxiliary line 161. The end of the second spoiler flange 17 away from the air inlet end is the third end, and the end of the second spoiler flange 17 close to the air inlet end is the fourth end. The third end and the fourth end are respectively located on both sides of the second auxiliary line 161, and the fourth end is closer to the air inlet end relative to the second auxiliary line 161. In this way, on the one hand, the second spoiler flange 17 can be made long enough so that the smoke is more concentrated in the third channel 133, and can exchange heat with the wall of the heat exchange tube installed in the second heat exchange hole 16 more, and the heat exchange effect is better; on the other hand, because the second spoiler flange 17 is long enough, accordingly, the opening area between two adjacent second spoiler flanges 17 can be made large enough, thereby saving the material of the heat exchange plate and greatly reducing the cost.

[0061] See also Figure 1 and Figure 2 , further, a third opening 153 is provided on the main board 10 in the area between the two second spoiler flanges 17 located between the two adjacent second heat exchange holes 16. In this way, there is no sheet material at the third opening 153, which is hollow, thereby saving the material of the heat exchange plate and reducing the cost. In addition, similar to the formation method of the first opening 151 and the first spoiler flange 12, the second spoiler flange 17 is specifically formed by folding the sheet material at the third opening 153, that is, the second spoiler flange 17 and the main board 10 are made into an integrated structure, and then folded to form two spoiler flanges while forming the third opening 153 on the main board 10. Of course, as an optional solution, it is also possible to directly open the third opening 153 on the main board 10, and weld the second spoiler flange 17 on the main board 10, or use a connector such as a screw, a screw, a clamping member, etc. to install the second spoiler flange 17 at the edge of the third opening 153, which is not limited here.

[0062] See also Figure 1 and Figure 2 Furthermore, the plate edges on both sides of the main board 10 are provided with third spoiler flanges 18. The third spoiler flange 18 is provided with a first exhaust port 181. The two spoiler flanges adjacent to the two sides of the second heat exchange hole 16 are spaced apart at one end close to the exhaust end to form a second exhaust port 182. The two second spoiler flanges 17 located at the two adjacent second heat exchange holes 16 are spaced apart at one end away from the exhaust end to form a third exhaust port 183. In this way, after the smoke exchanges heat with the heat exchange tubes of the first row of heat exchange holes, part of the smoke continues to exchange heat with the heat exchange tubes of the second row of heat exchange holes (and also continues to exchange heat with the main board 10), and then flows out from the second smoke exhaust port. In order to allow the smoke after heat exchange from the heat exchange tubes of the first row of heat exchange holes to have a better heat exchange with the heat exchange tubes of the second row of heat exchange holes without causing excessive smoke resistance, a small part of the smoke can be discharged outward through the first smoke exhaust port and the third smoke exhaust port.

[0063] It should be noted that the size and number of the first exhaust ports 181 on the third spoiler flange 18 are not limited and can be flexibly set according to actual needs.

[0064] It should be noted that the third spoiler flange 18 is located at the side of the main board 10, that is, it is arranged adjacent to the first heat exchange hole 11 and the second heat exchange hole 16 which are closest to the side of the main board 10. The third spoiler flange 18 forms a fourth channel 134 with the heat exchange tube installed in the first heat exchange hole 11 located at the side of the main board 10, and forms a fifth channel 135 with the heat exchange tube installed in the second heat exchange hole 16 located at the side of the main board 10. When the airflow flows through the fourth channel 134 and the fifth channel 135, the third spoiler flange 18 can guide the smoke to the middle part of the main board 10 and contact the back part of the heat exchange tube to improve the heat exchange effect. At the same time, the third spoiler flange 18 can prevent the smoke from staying on the two sides of the main board 10, which will cause the local temperature on both sides of the main board 10 to be too high, thereby affecting the service life of the heat exchange plate. In addition, the third spoiler flange 18 is inclined relative to the center line of the first row of heat exchange holes, and there is no need to set the main board 10 as a square main board 10 as traditionally, which can greatly reduce the material usage of the main board 10 and reduce costs.

[0065] It should be noted that the back of the heat exchange tube refers to the portion of the heat exchange tube facing away from the air inlet end.

[0066] In one embodiment, the distance between two second spoiler flanges 17 located at two adjacent second heat exchange holes 16 and away from the exhaust end is e, and the ratio of e to d is 0.6-0.8.

[0067] See also Figure 1 and Figure 2 In one embodiment, a first flow-guiding flange 191 is disposed around the main board 10, and the first flow-guiding flange 191 is located at the outlet end of the second channel 132. A second flow-guiding flange 192 is also disposed around the main board 10, and the second flow-guiding flange 192 is located in the area between one end of the first spoiler flange 12 close to the air inlet end and the first smoke exhaust port. In this way, the first flow-guiding flange 191 and / or the second flow-guiding flange 192 helps to guide the smoke flowing through the second channel 132 to the leeward side of the first row of heat exchange holes and the back of the heat exchange tube for heat exchange, thereby enhancing the heat exchange effect and making the smoke more fully contact with the heat exchange tubes installed in the first row of heat exchange holes, and the heat exchange effect will be improved. And this part of the smoke is diverted and directed to the first channel 131, so that the smoke passing through the heat exchange plate maintains a relatively uniform speed to ensure its better convection heat exchange coefficient and ensure sufficient heat exchange.

[0068] It is understandable that the portion on the main board 10 corresponding to the area enclosed by the first guide flange 191 can be a hollow opening, and the portion on the main board 10 corresponding to the area enclosed by the second guide flange 192 can also be a hollow opening, thereby saving materials and reducing costs.

[0069] In one embodiment, the first heat exchange hole 11 is formed with a first positioning flange 193 at its edge. The first positioning flange 193 is used to closely contact the heat exchange tube inserted into the first heat exchange hole 11, and is connected as a whole, so as to enhance the heat exchange effect. Similarly, the second heat exchange hole 16 is formed with a second positioning flange, and the second positioning flange is used to closely contact the heat exchange tube inserted into the second heat exchange hole 16, and is connected as a whole, so as to enhance the heat exchange effect.

[0070] In addition, optionally, process through holes 194 are provided on the adjacent sides of the main board 10 corresponding to the first heat exchange hole 11 and the second heat exchange hole 16. The process through holes 194 are used to insert welding rods during manufacturing, and can reduce the material usage of the main board 10 and reduce the local high temperature in the area where it is located, which is beneficial to improving the material utilization and service life of the heat exchange plate.

[0071] See also Figure 1 or Figure 2 In one embodiment, the number of the first heat exchange holes 11 in the first row of heat exchange holes is one more than the number of the second row of heat exchange holes, and the first heat exchange holes 11 in the first row of heat exchange holes and the second heat exchange holes 16 in the second row of heat exchange holes are arranged alternately in the direction from the air intake end to the exhaust end. In this way, after the high-temperature flue gas flows through the second channel 132 and exchanges heat with the heat exchange tube installed in the first heat exchange hole 11, the high-temperature flue gas continues to flow forward and flows to the third channel 133, guided by the second spoiler flange 17, so that the high-temperature flue gas can better exchange heat with the heat exchange tube installed in the second heat exchange hole 16 during the process of passing through the third channel 133, which can improve the heat exchange efficiency and ensure the heat exchange effect.

[0072] In another embodiment, see Figure 3 , Figure 3 FIG. 1 shows a top view of a heat exchanger according to another embodiment of the present invention. Figure 3 Relative to Figure 1 and Figure 2 In terms of Figure 3 The number of the first heat exchange holes 11 in the first row of heat exchange holes is 4, which is Figure 2 The first heat exchange hole 11 of the first row of heat exchange holes shown in FIG. 1 has one more first heat exchange hole 11. In addition, Figure 3 The number of the second heat exchange holes 16 in the second row of heat exchange holes is 3, which is Figure 2The second heat exchange hole 16 of the second row of heat exchange holes shown in the figure has one more. It can be understood that the first heat exchange holes 11 of the first row of heat exchange holes can also be 5, 6 or other numbers, which are not limited here. Similarly, the number of the second heat exchange holes 16 of the second row of heat exchange holes can also be 4, 5 or other numbers, which are not limited here.

[0073] In yet another embodiment, see Figure 4 , Figure 4 FIG. 4 shows a top view of a heat exchange plate according to another embodiment of the present invention. Figure 4 Relative to Figure 1 and Figure 2 In terms of Figure 4 The second row of heat exchange holes Figure 2 The second row of heat exchange holes in are the same, except that: Figure 4 The first row of heat exchange holes may be more than one row, it may be more than two rows, and the number of the first heat exchange holes 11 in the more than two rows of first rows of heat exchange holes increases one by one in the direction from the exhaust end to the intake end, and the first heat exchange holes 11 of two adjacent first rows of heat exchange holes are staggered in the direction from the intake end to the exhaust end.

[0074] Please refer to Figure 1 and Figure 2 In one embodiment, a heat exchange device is provided. Specifically, the heat exchange device may be a heat exchanger or a gas water heater. The heat exchange device includes the heat exchange plate of any of the above embodiments.

[0075] In the above heat exchange device, after stacking and assembling two or more heat exchange plates to form a heat exchange device, a flue gas channel is formed between two adjacent heat exchange plates, and the high-temperature flue gas contacts and conducts heat with the heat exchange tube during the process of flowing through the flue gas channel. Since the main board 10 is also provided with two first spoiler flanges 12 located between two adjacent first heat exchange holes 11, the two first spoiler flanges 12 are arranged at intervals to form a first channel 131, and the first spoiler flanges 12 are used to cooperate with the heat exchange tube wall in the adjacent first heat exchange hole 11 to form a second channel 132, and the width of the second channel 132 gradually decreases along the flow direction of the airflow. In this way, on the one hand, the two first spoiler flanges 12 divide the high-temperature flue gas flowing between the two adjacent first heat exchange holes 11 into three parts, one part of the high-temperature flue gas flows in the first channel 131, and the other two parts of the high-temperature flue gas flow in the second channel 132 formed by the two first spoiler flanges 12 and the walls of the heat exchange tubes in the respective adjacent first heat exchange holes 11. The high-temperature flue gas flowing in the second channel 132 can better exchange heat with the heat exchange tubes installed in the first heat exchange holes 11, and the high-temperature flue gas flowing in the first channel 131 can continue to flow forward and exchange heat with the walls of the heat exchange tubes in other rows of heat exchange holes; on the other hand, after the high-temperature flue gas contacts and exchanges heat with the heat exchange tubes and heat exchange plates of the first heat exchange holes 11, the temperature of the high-temperature flue gas will gradually decrease and the volume will decrease. If the flow rate is in a channel of the same size, it will slow down. However, the gradually narrowing second channel 132 can keep the flow rate of the high-temperature flue gas relatively stable, which is conducive to maintaining a relatively high convection heat transfer coefficient, thereby achieving an enhanced heat transfer effect, and is also conducive to blowing away the dust particles generated by combustion, thereby ensuring that the second channel 132 is unobstructed and maintaining the heat transfer effect. It can be seen that the heat exchange efficiency can be effectively improved, and materials can be saved and costs can be reduced.

[0076] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0078] 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", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0082] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. A heat exchanger for a gas water heater, characterized in that: The heat exchanger comprises: A main board (10), the main board (10) being divided into an air inlet end and an air outlet end according to the flow direction of the airflow at the pre-installed position, the main board (10) being provided with a first row of heat exchange holes, the first row of heat exchange holes comprising at least two first heat exchange holes (11) arranged in sequence and spaced apart, the first heat exchange holes (11) being used to install heat exchange tubes, the main board (10) being further provided with two first spoiler flanges (12) located between two adjacent first heat exchange holes (11), the two first spoiler flanges (12) being spaced apart to form a first channel (131); the first spoiler flanges (12) being used to cooperate with the wall of the heat exchange tube in the adjacent first heat exchange hole (11) to form a second channel (132), the width of the second channel (132) gradually increasing along the airflow direction. The first spoiler flange (12) is a first end, and the first spoiler flange (12) is a second end. The first end and the first heat exchange hole (11) adjacent to the first end have a first connection line (141) whose center is the first heat exchange hole (11) and whose edge is the first heat exchange hole (11). The second end and the second end have a second connection line (142) whose center is the first heat exchange hole (11) adjacent to the second end and whose edge is the first heat exchange hole (11). The second end and the second end have a second connection line (142) whose center is the first heat exchange hole (11) adjacent to the second end. The second end and the second end have a second connection line (142) whose center is the first heat exchange hole (11) ... adjacent to the second end. The second end and the second end have a second connection line (142) whose center is the first heat exchange hole (11) and whose edge is the first heat exchange hole (11). The second end and the second end have a second connection line (142) whose center is the second heat exchange hole (11) and whose edge is the first heat exchange hole (11). The second end and the second end have a second connection line (142) whose center is the second heat exchange hole (11). The second end and the second end have a second connection line (142) whose center is the first heat exchange hole (11) adjacent to the second end. The second end and the first end have a second connection line (141) whose center is the first heat exchange hole (11). The second end and the second end have a second connection line (141) whose center is the first heat exchange hole (11). The second end and the second end have a second connection line (141) whose center is the first heat exchange hole (11). A straight line passing through the centers of at least two of the first heat exchange holes (11) is defined as a first auxiliary line (111); an end of the first spoiler flange (12) away from the air inlet end is defined as a first end, and an end of the first spoiler flange (12) close to the air inlet end is defined as a second end; a line connecting the first end and the center of a first heat exchange hole (11) adjacent to the first end is defined as a first connecting line (141), and the first connecting line (141) forms an angle r with the first auxiliary line (111); A line connecting the second end and the center of the first heat exchange hole (11) adjacent to the second end is defined as a second connecting line (142), and the second connecting line (142) forms an angle p with the first auxiliary line; Among them, 27°≦r≦40°, -5°≦p≦5°.

2. The heat exchange plate according to claim 1, characterized in that: The first spoiler flange (12) is an arc-shaped flange; the center of the first spoiler flange (12) and the first heat exchange hole (11) adjacent to the first spoiler flange (12) are located on the same side of the first spoiler flange (12), and the center of the first spoiler flange (12) is closer to the air inlet end than the center of the first heat exchange hole (11).

3. The heat exchange plate according to claim 1, characterized in that: A first opening (151) is provided on the main board (10) in an area corresponding to the area between two first spoiler flanges (12) located between two adjacent first heat exchange holes (11).

4. The heat exchange plate according to claim 3, characterized in that: A second opening (152) corresponding to and connected to the first opening (151) is also provided in an area between two adjacent first heat exchange holes (11) on the main board (10); the second opening (152) is closer to the air inlet end than the first opening (151).

5. The heat exchange plate according to claim 1, characterized in that: The main board (10) is also provided with a second row of heat exchange holes, the second row of heat exchange holes being closer to the exhaust end than the first row of heat exchange holes, the second row of heat exchange holes comprising at least two second heat exchange holes (16) arranged in sequence and spaced apart, the second heat exchange holes (16) being used to install heat exchange tubes, the main board (10) is also provided with two second spoiler flanges (17) located between two adjacent second heat exchange holes (16); the spacing between the two second spoiler flanges (17) gradually increases in the direction from the intake end to the exhaust end; the second spoiler flange (17) is used to cooperate with the wall of the heat exchange tube in the adjacent second heat exchange hole (16) to form a third channel (133).

6. The heat exchange plate according to claim 5, characterized in that: A straight line passing through the centers of at least two of the second heat exchange holes (16) is defined as a second auxiliary line (161); an end of the second spoiler flange (17) away from the air inlet end is a third end, and an end of the second spoiler flange (17) close to the air inlet end is a fourth end; the third end and the fourth end are respectively located on both sides of the second auxiliary line (161), and the fourth end is closer to the air inlet end than the second auxiliary line (161).

7. The heat exchange plate according to claim 5, characterized in that: The second spoiler flange (17) comprises a first arc-shaped flange (171) and a second arc-shaped flange (172) connected to each other, the first arc-shaped flange (171) being closer to the exhaust end than the second arc-shaped flange (172); the center of the first arc-shaped flange (171) and the second heat exchange hole (16) adjacent to the second spoiler flange (17) are both located on the same side of the second spoiler flange (17), the center of the first arc-shaped flange (171) being closer to the intake end than the center of the second heat exchange hole (16); the center of the second arc-shaped flange (172) and the second heat exchange hole (16) adjacent to the second spoiler flange (17) are respectively located on different sides of the second spoiler flange (17).

8. The heat exchange plate according to claim 5, characterized in that: The end of the second spoiler flange (17) away from the air inlet end is the third end, and the end of the second spoiler flange (17) close to the air inlet end is the fourth end; the distance from the intersection of the third end and the center of the second heat exchange hole (16) adjacent to the third end with the edge of the second heat exchange hole (16) to the third end is c; the distance from the intersection of the fourth end and the center of the second heat exchange hole (16) adjacent to the fourth end with the edge of the second heat exchange hole (16) to the fourth end is d; wherein c is smaller than d, and the width of the third channel (133) gradually decreases along the flow direction of the airflow.

9. The heat exchange plate according to claim 8, characterized in that: The ratio of c to d is 0.6-0.

8.

10. The heat exchange plate according to claim 5, characterized in that: The plate edges of the main board (10) on opposite sides are each provided with a third spoiler flange (18), and the third spoiler flange (18) is provided with a first exhaust port (181); two spoiler flanges adjacent to the two sides of the second heat exchange hole (16) are spaced apart at one end close to the exhaust end to form a second exhaust port (182); and two second spoiler flanges (17) located at two adjacent second heat exchange holes (16) are spaced apart at one end away from the exhaust end to form a third exhaust port (183).

11. The heat exchange plate according to claim 10, characterized in that: The distance between the two second spoiler flanges (17) located at two adjacent second heat exchange holes (16) and away from one end of the exhaust end is e, and the ratio of e to d is 0.6-0.

8.

12. The heat exchange plate according to claim 10, characterized in that: A first flow-guiding flange (191) is wound around the main board (10), and the first flow-guiding flange (191) is located at the air outlet end of the second channel (132); a second flow-guiding flange (192) is also wound around the main board (10), and the second flow-guiding flange (192) is located in a region between an end of the first spoiler flange (12) close to the air inlet end and the first exhaust port (181).

13. The heat exchange plate according to any one of claims 5 to 12, characterized in that: The number of the first heat exchange holes (11) in the first row of heat exchange holes is one more than the number of the second row of heat exchange holes, and the first heat exchange holes (11) in the first row of heat exchange holes and the second heat exchange holes (16) in the second row of heat exchange holes are arranged alternately in the direction from the air intake end to the exhaust end.

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