Heat exchange assembly and gas water heater

Abstract

The utility model provides a heat exchange assembly and a gas water heater, relates to the technical field of gas water heaters, and aims to solve the problem that an existing heat exchange assembly is not suitable for a fan-free gas water heater, the heat exchange assembly comprises a fin set, the fin set comprises a plurality of fins arranged at intervals in the first direction, and a gas passing channel is formed between every two same fins; a plurality of pipe holes are formed in the fins and are used for forming pipeline mounting cavities; wherein each fin comprises an air inlet section, an air outlet section and a middle section located between the air inlet section and the air outlet section, the air inlet sections and the air outlet sections are connected with each other, and the multiple pipe holes are all formed in the middle sections; in the first direction, the minimum width of the air passing channel at the air outlet section is larger than the minimum width of the air passing channel at the middle section. According to the heat exchange assembly provided by the utility model, the width of the gas passing channel is wider, so that high-temperature flue gas can be better discharged, and even for a gas water heater without a fan, the high-temperature flue gas subjected to heat exchange can be naturally discharged due to the fact that the choked flow of the gas outlet section is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas water heater technical field, concretely, relate to a heat exchange subassembly and gas water heater. BACKGROUND

[0002] At present, in order to facilitate the contact area between flue gas and fin, the upper and lower edges of fin are usually provided with flanging, thereby forming the flow resistance, thereby retaining the heat in the fin, improving the thermal efficiency, but this scheme is only applicable to the gas water heater with fan, because the air after heat exchange can be discharged through the fan, but for the gas water heater without fan, this scheme is completely inapplicable, because the upper and lower edges of fin are provided with flanging, in the case without fan, hot flue gas is difficult to discharge from the fin, so when the user adjusts the cool water, due to the accumulation of flue gas in the fin, it is difficult to provide cool water in time. SUMMARY

[0003] The utility model solves the problem that the existing heat exchange subassembly is not applicable to the gas water heater without fan.

[0004] The first aspect of the utility model provides a heat exchange subassembly.

[0005] The second aspect of the utility model provides a gas water heater.

[0006] The heat exchange subassembly provided by the first aspect of the utility model is applied to the gas water heater, and the heat exchange subassembly comprises a fin group, a plurality of fins are arranged at intervals along a first direction, a gas passage is formed between the same two fins, a plurality of pipe holes are arranged on the fin, and the pipe holes are used to form a pipe installation cavity; wherein the fin comprises an air inlet section, an air outlet section and an intermediate section located between the air inlet section and the air outlet section and connected with each other, and the plurality of pipe holes are arranged on the intermediate section; along the first direction, the minimum width of the gas passage at the air outlet section is greater than the minimum width of the gas passage at the intermediate section.

[0007] The heat exchange assembly provided by the utility model is applied to a gas water heater, especially to a gas water heater without a fan, and the heat exchange assembly comprises a fin group, the fin group comprises a plurality of fins, the gas water heater can generate flue gas and perform heat exchange with the fin group; a gas passage is formed between the same two fins, a plurality of pipe holes are arranged on the fins, the pipe holes are used for forming a pipe installation cavity, the pipe installation cavity is used for installing a heat exchange pipe, the fin comprises an air inlet section, an air outlet section and an intermediate section which are connected with each other, the plurality of pipe holes are arranged on the intermediate section, along a first direction, the minimum width of the gas passage at the air outlet section is greater than the minimum width of the gas passage at the intermediate section. The conventional fin is provided with a turn-up structure at the edges of the air inlet section and the air outlet section, so that the minimum width of the gas passage of the air inlet section and the air outlet section is basically the same as the minimum width of the gas passage of the intermediate section, the fin group of the application, the minimum width of the gas passage of the air outlet section is greater than the minimum width of the gas passage of the intermediate section, so that the width of the gas passage is wider, which is more conducive to the discharge of high-temperature flue gas, even for the gas water heater without the fan, since the flow resistance of the air outlet section is reduced, the high-temperature flue gas after heat exchange can be naturally discharged, and the problem that the high-temperature flue gas is difficult to discharge from the inside of the fin without the fan, so that cold water cannot be provided in time, is overcome.

[0008] In some technical solutions, optionally, the width of the gas passage at the air outlet section is constant.

[0009] In the technical solution, the width of the gas passage at the air outlet section is constant, that is, the fin does not have a turn-up at any position of the air outlet section, so that the smoke exhaust efficiency of the air outlet section can be further improved.

[0010] In some technical solutions, optionally, the gas water heater can generate flue gas, the flue gas can pass through the fin group along a second direction and perform heat exchange with the fin group, and the fin is a straight structure extending in the second direction at the air outlet section.

[0011] In the technical solution, the fin is a straight structure extending in the second direction at the air outlet section, that is, the fin does not contain a turn-up at the air outlet section, so that the smoke exhaust efficiency of the air outlet section can be further improved.

[0012] In some technical solutions, optionally, the fin is a straight structure extending in the second direction at the air inlet section.

[0013] In the technical solution, the air inlet section is a non-turn-up structure, since the air inlet section does not contain a turn-up, it is more conducive to the entry of high-temperature flue gas into the fin group, so that the heat exchange efficiency is improved.

[0014] In some technical solutions, optionally, the fin is in a corrugated shape, and the plurality of fins are arranged to form the fin group along the first direction.

[0015] In the technical scheme, the corrugated fin has better heat exchange effect, has higher surface area at the same length along the first direction, and is more conducive to heat exchange.

[0016] In some technical schemes, optionally, the fin comprises an upper convex segment and a lower concave segment, the upper convex segment is provided with a first pipe hole, the first pipe holes of the plurality of fins form a first pipe installation cavity, the lower concave segment is provided with a second pipe hole, and the second pipe holes of the plurality of fins form a second pipe installation cavity.

[0017] In the technical scheme, the area between the two adjacent pipe holes is larger under the condition that the distance between the left and right ends of the fin group remains unchanged, the contact area of flue gas and the fin and the heat exchange pipe is increased, and therefore the heat exchange coefficient of the heat exchange pipe is improved.

[0018] In some technical schemes, optionally, the fin is provided with a first flange at an edge close to the first pipe hole, the first flange is bent to one side of an adjacent fin, and the first flange is arranged on the middle segment.

[0019] In some technical schemes, optionally, the fin is provided with a second flange at an edge close to the second pipe hole, the second flange is bent to one side of an adjacent fin, and the second flange is arranged on the middle segment.

[0020] In the technical scheme, the first pipe hole and the second pipe hole are surrounded by the flange, that is, the first pipe hole and the second pipe hole are flange holes with flanges, the first flange and the second flange are bent to one side of an adjacent fin, and therefore the flange can be used to block the flow of flue gas during the flow of flue gas, and the heat exchange time of flue gas and the fin group is improved.

[0021] In some technical schemes, optionally, the first flange forms a boundary between the gas outlet segment and the middle segment at an edge close to the gas outlet side, that is, the flue gas enters the gas outlet segment after passing through the first flange. Similarly, the second flange forms a boundary between the gas inlet segment and the middle segment at an edge close to the gas inlet side.

[0022] In some technical schemes, optionally, a through hole is further arranged on the fin, the through hole is arranged between the first pipe hole and the second pipe hole, a third flange is arranged on an edge of the fin close to the through hole, and the third flange is bent to one side of an adjacent fin.

[0023] In the technical scheme, on the basis of the first flange and the second flange, a through hole is additionally arranged between the first pipe hole and the second pipe hole, and a third flange is formed, so that the flow blocking effect of flue gas can be further improved, and therefore the heat exchange time of flue gas and the fin group is improved.

[0024] In some technical schemes, optionally, the length of the third flange in the bending direction is greater than or equal to 1 mm and less than or equal to 2 mm.

[0025] In the technical solution, the length of the third flange along the bending direction, that is, the height of the flange, should not be too long. If the flange is too long, it will affect the arrangement between the two adjacent fins, resulting in the overall length of the fin group being too long. If the height of the flange is too short, it will reduce the flow resistance effect. Therefore, it is most suitable to be set between 1mm to 2mm, for example, it can be 1.5mm. In addition, the length of the first flange and the second flange along the bending direction can also be set to be greater than or equal to 1mm and less than or equal to 2mm.

[0026] In some technical solutions, optionally, the diameter of the first pipe hole is greater than or equal to 8mm and less than or equal to 16mm.

[0027] In some technical solutions, optionally, the diameter of the second pipe hole is greater than or equal to 8mm and less than or equal to 16mm.

[0028] In the technical solution, the diameter of the first pipe hole and the second pipe hole should not be too large. If the diameter is too large, it will result in a large amount of water storage, which will cause the water temperature after heat exchange to not meet the requirements. Of course, the diameter of the first pipe hole and the second pipe hole should not be too small. If it is too small, it will not be able to effectively utilize the heat of the flue gas, resulting in waste of energy.

[0029] In some technical solutions, optionally, the first pipe hole and the second pipe hole are staggered.

[0030] In the technical solution, the first pipe hole and the second pipe hole are staggered, that is, the first pipe hole is arranged on the upper convex segment and the second pipe hole is arranged on the lower concave segment. In this way, under the premise that the distance between the left and right ends of the fin group remains unchanged, the area between the two adjacent pipe holes is larger, which increases the contact area of the flue gas with the fin and the heat exchange pipe, thereby improving the heat exchange coefficient of the heat exchange pipe.

[0031] In some technical solutions, optionally, the distance between the centers of the adjacent first pipe hole and the second pipe hole is greater than or equal to 20mm and less than or equal to 30mm.

[0032] In the technical solution, the distance between the centers of the adjacent first pipe hole and the second pipe hole should not be too far. If the distance is too far, it will result in a smaller number of heat exchange pipes under the premise that the distance between the left and right ends of the fin group remains unchanged, thereby reducing the heat exchange efficiency. If the distance between the centers of the adjacent first pipe hole and the second pipe hole is too close, it will result in the temperature of the liquid not meeting the requirements. Therefore, it is best to be set between 20mm to 30mm, for example, it can be 25mm.

[0033] In some embodiments, the heat exchange assembly further comprises: a heat exchange pipe installed in the pipe installation cavity; and at least one smoke baffle, one end or both ends of the fin group being provided with a smoke baffle along the first direction, one of the smoke baffles being provided with an inlet, and the other of the smoke baffles being provided with an outlet, the inlet and the outlet being connected to two ends of the heat exchange pipe respectively; wherein the gas water heater is capable of generating flue gas, and the flue gas is capable of passing through the fin group and exchanging heat with the heat exchange pipe.

[0034] In this embodiment, the heat exchange assembly further comprises a heat exchange pipe and at least one smoke baffle, the heat exchange pipe being installed in the pipe installation cavity, one end or both ends of the fin group being provided with a smoke baffle along the first direction, one of the smoke baffles being provided with an inlet, and the other of the smoke baffles being provided with an outlet, the inlet and the outlet being connected to two ends of the heat exchange pipe respectively, and in addition, the gas water heater is capable of generating flue gas, and the flue gas is capable of passing through the fin group from the bottom of the fin group and exchanging heat with the heat exchange pipe. Since at least one end of the fin group is provided with a smoke baffle, the presence of the smoke baffle can avoid the flue gas spreading to the side where the smoke baffle is located as much as possible when the flue gas passes through the fin group and exchanges heat with the heat exchange pipe, and the flue gas is made to contact the fin group as much as possible, thereby improving the heat exchange coefficient of the heat exchange pipe.

[0035] In some embodiments, the at least one smoke baffle comprises a first smoke baffle and a second smoke baffle, the first smoke baffle and the second smoke baffle being provided at two ends of the fin group along the first direction, the inlet being provided on the first smoke baffle or the second smoke baffle, and the outlet being provided on the first smoke baffle or the second smoke baffle.

[0036] In this embodiment, the number of smoke baffles is two, and the smoke baffles are located at two ends of the fin group, the inlet is provided on one of the two smoke baffles, and the outlet is provided on the other of the two smoke baffles. By providing a smoke baffle at each end of the fin group, the flue gas can be further concentrated on the fin group, thereby further improving the heat exchange coefficient.

[0037] In some embodiments, the inlet and the outlet are both provided on the first smoke baffle.

[0038] In this embodiment, the inlet and the outlet are provided on the same smoke baffle, i.e., on the same side of the fin group, which is more conducive to the arrangement of the waterway.

[0039] In some embodiments, the fin group and the heat exchange pipe are connected by welding.

[0040] In this embodiment, the fin group and the heat exchange pipe are connected by welding, which can improve the connection strength of the two and avoid the heat exchange pipe from falling off from the fin group.

[0041] In some technical solutions, the heat exchange pipe comprises four straight pipes, a first elbow pipe, a second elbow pipe and a third elbow pipe, the four straight pipes are arranged along the first direction, each straight pipe comprises a first interface and a second interface, two ends of the first elbow pipe are connected to the first interfaces of two straight pipes among the four straight pipes, two ends of the second elbow pipe are connected to the first interfaces of the other two straight pipes among the four straight pipes, two ends of the third elbow pipe are connected to the second interfaces of the two straight pipes among the four straight pipes, one of the second interfaces of the other two straight pipes is connected to the liquid inlet, and the other second interface is connected to the liquid outlet.

[0042] In the technical solution, the heat exchange pipe comprises four straight pipes and three elbow pipes, the four straight pipes are arranged along the first direction, each straight pipe has a first interface and a second interface along the first direction, and the four straight pipes are arranged inside the pipe installation cavity, the three elbow pipes can all be U-shaped pipes and are arranged outside the pipe installation cavity, two ends of the first elbow pipe are connected to the first interfaces of two straight pipes among the four straight pipes, two ends of the second elbow pipe are connected to the first interfaces of the other two straight pipes among the four straight pipes, two ends of the third elbow pipe are connected to the second interfaces of the two straight pipes among the four straight pipes, one of the second interfaces of the other two straight pipes is connected to the liquid inlet, and the other second interface is connected to the liquid outlet, so that the four straight pipes and the three elbow pipes form a complete heat exchange pipe.

[0043] The second aspect of the utility model provides a kind of gas water heater, comprising: as any one of the heat exchange assembly provided in the first aspect of the utility model.The gas water heater provided by the utility model includes the heat exchange assembly provided in any one of the first aspect of the utility model, so it has all the beneficial effects of the heat exchange assembly provided in any one of the first aspect of the utility model, which will not be repeated here.

[0044] In some technical solutions, the gas water heater comprises a fanless gas water heater.

[0045] That is, the gas water heater of the present application does not have a fan. Due to the fin structure of the present application, the surface does not have a complex spoiler structure, so that the resistance of the flue gas flow is reduced, and the resistance loss of the flue gas flowing through the heat exchanger is reduced. It can be understood that the current gas water heater is usually a gas water heater with a fan. Therefore, due to the existence of the fan, the resistance of the fin to the airflow does not need to be considered, and only the good heat exchange between the airflow and the fin needs to be ensured. Therefore, under normal circumstances, the current fin structure has many spoiler structures on its surface to increase the contact area between the flue gas and the fin. The fin structure of the present application does not have a complex spoiler structure on its surface, so it can also discharge the flue gas after heat exchange without a fan.

[0046] The additional aspects and advantages according to the utility model will become obvious in the following description part, or be understood through the practice according to the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0047] The above and / or additional aspects and advantages according to embodiments of the utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0048] Figure 1 One of structural schematic diagram of heat exchange assembly of the utility model embodiment is shown;

[0049] Figure 2 The structural schematic diagram of the smoke baffle of the utility model embodiment is shown;

[0050] Figure 3 The structural schematic diagram of the fin group of the utility model embodiment is shown;

[0051] Figure 4 The structural schematic diagram two of heat exchange assembly of the utility model embodiment is shown;

[0052] Figure 5 The structural schematic diagram of heat exchange pipe of the utility model embodiment is shown;

[0053] Figure 6 The structural schematic diagram one of fin of the utility model embodiment is shown;

[0054] Figure 7 The structural schematic diagram of Figure 6 The structure enlarged view of A in the middle;

[0055] Figure 8 The structural schematic diagram of gas water heater of the utility model embodiment is shown.

[0056] Wherein, Figures 1 to 8 The corresponding relationship between the reference signs and the component names is as follows:

[0057] 1 heat exchange assembly, 12 fin group, 122 fin, 1222 upper convex segment, 1224 lower concave segment, 124 pipeline installation cavity, 1242 first pipeline installation cavity, 1244 second pipeline installation cavity, 125 air inlet segment, 126 intermediate segment, 127 air outlet segment, 128 air passage, 13 heat exchange pipe, 132 straight pipe, 1322 first interface, 1324 second interface, 134 first elbow pipe, 136 second elbow pipe, 138 third elbow pipe, 14 smoke baffle, 142 liquid inlet, 144 liquid outlet, 146 first smoke baffle, 148 second smoke baffle, 15 pipe hole, 152 first pipe hole, 154 second pipe hole, 156 through hole, 162 first flange, 164 second flange, 166 third flange, 2 gas water heater. DETAILED DESCRIPTION

[0058] In order to enable the above aspects, features and advantages of the embodiments according to the present application to be more clearly understood, the embodiments according to the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0059] In the following description, many specific details are set forth in order to provide a thorough understanding of the embodiments according to the present application, but the embodiments according to the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the embodiments according to the present application is not limited by the specific embodiments disclosed below.

[0060] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 8 The heat exchange assembly 1 provided by the first aspect of the present application is applied to a gas water heater 2, and the heat exchange assembly 1 comprises: a fin group 12, which comprises a plurality of fins 122 arranged at intervals along a first direction, and a gas passage 128 is formed between any two identical fins 122, a plurality of pipe holes 15 are arranged on the fin 122, and the pipe hole 15 is used to form a pipe installation cavity 124; wherein the fin 122 comprises an air inlet section 125, an air outlet section 127 and an intermediate section 126 located between the air inlet section 125 and the air outlet section 127, and the plurality of pipe holes 15 are arranged on the intermediate section 126; along the first direction, the minimum width of the gas passage 128 at the air outlet section 127 is greater than the minimum width of the gas passage 128 at the intermediate section 126.

[0061] The heat exchange assembly 1 provided by the utility model is applied to the gas water heater 2, especially to the gas water heater 2 without a fan, the heat exchange assembly 1 comprises a fin group 12, the fin group 12 comprises a plurality of fins 122, the gas water heater 2 can generate flue gas and exchange heat with the fin group 12; a gas passage 128 is formed between the same two fins 122, a plurality of pipe holes 15 are arranged on the fin 122, the pipe hole 15 is used for forming a pipe installation cavity 124, the pipe installation cavity 124 is used for installing a heat exchange pipe 13, the fin 122 comprises an air inlet section 125, an air outlet section 127 and an intermediate section 126 which are connected with each other, the plurality of pipe holes 15 are all arranged on the intermediate section 126, along a first direction, the minimum width of the gas passage 128 at the air outlet section 127 is greater than the minimum width of the gas passage 128 at the intermediate section 126. The conventional fin 122 is at the air inlet section 125 and the air outlet section 127, the edge of the fin 122 is all provided with a turn-up structure, so that the minimum width of the gas passage 128 of the air inlet section 125 and the air outlet section 127 is basically the same as the minimum width of the gas passage 128 of the intermediate section 126, the fin group 12 of the application, the minimum width of the gas passage 128 of the air outlet section 127 is greater than the minimum width of the gas passage 128 of the intermediate section 126, so the width of the gas passage 128 is wider, so it is more beneficial to the discharge of high-temperature flue gas, even for the gas water heater 2 without a fan, due to the reduction of the flow resistance of the air outlet section 127, the high-temperature flue gas after heat exchange can be naturally discharged, and the problem that the high-temperature flue gas is difficult to discharge from the inside of the fin 122 in the case of no fan, so that cool water cannot be provided in time is overcome.

[0062] In some technical solutions, optionally, the width of the gas passage 128 at the air outlet section 127 is constant.

[0063] In the technical solution, the width of the gas passage 128 at the air outlet section 127 is constant, that is, the fin 122 does not have a turn-up at any position of the air outlet section 127, and the flow direction of the flue gas at the air outlet section 127 is constant, so that the smoke exhaust efficiency of the air outlet section 127 can be further improved.

[0064] In some technical solutions, optionally, the gas water heater 2 can generate flue gas, the flue gas can pass through the fin group 12 along a second direction and exchange heat with the fin group 12, and the fin 122 is a straight structure extending in the second direction at the air outlet section 127.

[0065] In the technical solution, the fin 122 is a straight structure extending in the second direction at the air outlet section 127, that is, the fin 122 does not contain a turn-up at the air outlet section 127, so that the smoke exhaust efficiency of the air outlet section 127 can be further improved.

[0066] In some technical solutions, optionally, the fin 122 is a straight structure extending in the second direction at the air inlet section 125.

[0067] In the technical solution, the air inlet section 125 is a non-flanged structure, because the air inlet section 125 does not contain a flange, which is more conducive to the high-temperature flue gas entering the fin group 12, thereby improving the heat exchange efficiency.

[0068] In some technical solutions, as shown in Figure 6 The shape of the fin 122 is corrugated, and a plurality of fins 122 are arranged along the first direction to form the fin group 12.

[0069] In the technical solution, the heat exchange effect of the corrugated fin 122 is better. Along the first direction, there is a higher surface area under the same length, thereby being more conducive to heat exchange.

[0070] In some technical solutions, as shown in

[0071] In the technical solution, under the premise that the distance between the left and right ends of the fin group 12 remains unchanged, the area between the adjacent two tube holes is larger, so that the contact area of the flue gas and the fin 122 and the heat exchange pipe 13 is increased, thereby improving the heat exchange coefficient of the heat exchange pipe 13.

[0072] In some technical solutions, as shown in Figure 6 The edge of the fin 122 close to the first tube hole 152 is provided with a first flange 162, the first flange 162 is bent to one side of the adjacent fin 122, and the first flange 162 is arranged on the middle section 126.

[0073] In some technical solutions, as shown in

[0074] In the technical solution, the first tube hole 152 and the second tube hole 154 are formed with flanges, that is, the first tube hole 152 and the second tube hole 154 are flanged holes with flanges, and the first flange 162 and the second flange 164 are bent to one side of the adjacent fin 122, so that during the flow of the flue gas, the flanges can be used to block the flow of the flue gas, thereby improving the heat exchange time of the flue gas and the fin group 12.

[0075] In some embodiments, the first flange 162 is arranged adjacent to the edge of the air outlet side to form a boundary between the air outlet section 127 and the middle section 126, i.e. the flue gas enters the air outlet section 127 after passing through the first flange 162. Similarly, the second flange 164 is arranged adjacent to the edge of the air inlet side to form a boundary between the air inlet section 125 and the middle section 126.

[0076] In some embodiments, the fin 122 is further provided with a through hole 156 arranged between the first tube hole 152 and the second tube hole 154, and the fin 122 is provided with a third flange 166 arranged adjacent to the edge of the through hole 156. Figure 6 and Figure 7 In some embodiments, the fin 122 is further provided with a through hole 156 arranged between the first tube hole 152 and the second tube hole 154, and the fin 122 is provided with a third flange 166 arranged adjacent to the edge of the through hole 156.

[0077] In this embodiment, the through hole 156 is additionally arranged between the first tube hole 152 and the second tube hole 154 based on the first flange 162 and the second flange 164, and the third flange 166 is formed, which can further improve the flow resistance of the flue gas and thus improve the heat exchange time of the flue gas with the fin group 12.

[0078] In some embodiments, the length of the third flange 166 in the bending direction is greater than or equal to 1 mm and less than or equal to 2 mm.

[0079] In this embodiment, the length of the third flange 166 in the bending direction, i.e. the height of the flange, should not be too long, otherwise it will affect the arrangement of the two adjacent fins 122, resulting in an excessively long overall length of the fin group 12. If the height of the flange is too short, the flow resistance will be reduced. Therefore, the height of the flange is preferably set to be between 1 mm and 2 mm, for example, 1.5 mm. In addition, the length of the first flange 162 and the second flange 164 in the bending direction can also be set to be greater than or equal to 1 mm and less than or equal to 2 mm.

[0080] In some embodiments, the diameter of the first tube hole 152 is greater than or equal to 8 mm and less than or equal to 16 mm.

[0081] In some embodiments, the diameter of the second tube hole 154 is greater than or equal to 8 mm and less than or equal to 16 mm.

[0082] In this embodiment, the diameter of the first tube hole 152 and the second tube hole 154 should not be too large, otherwise the water storage capacity will be large, which will result in a water temperature that does not meet the requirements after heat exchange. Of course, the diameter of the first tube hole 152 and the second tube hole 154 should not be too small, otherwise the heat of the flue gas cannot be effectively utilized, resulting in waste of energy.

[0083] In some embodiments, the first tube hole 152 and the second tube hole 154 are arranged alternately.

[0084] In the technical solution, the first tube hole 152 and the second tube hole 154 are staggered, that is, the first tube hole 152 is arranged on the upper convex section 1222, and the second tube hole 154 is arranged on the lower concave section 1224. In this way, the area between the adjacent two tube holes is larger under the premise that the distance between the left and right ends of the fin group 12 remains unchanged, so that the contact area of the flue gas and the fin 122 and the heat exchange pipe 13 is increased, thereby improving the heat exchange coefficient of the heat exchange pipe 13.

[0085] In some technical solutions, optionally, the distance between the centers of the adjacent first tube hole 152 and the second tube hole 154 is greater than or equal to 20 mm and less than or equal to 30 mm.

[0086] In the technical solution, the distance between the centers of the adjacent first tube hole 152 and the second tube hole 154 should not be too far. If the distance between the centers is too far, the number of heat exchange pipes 13 will be less under the premise that the distance between the left and right ends of the fin group 12 remains unchanged, thereby reducing the heat exchange efficiency. If the distance between the centers of the adjacent first tube hole 152 and the second tube hole 154 is too close, the temperature of the liquid cannot meet the requirements. Therefore, the distance is preferably between 20 mm and 30 mm, for example, it can be 25 mm.

[0087] In some technical solutions, optionally, the heat exchange assembly 1 further comprises: a heat exchange pipe 13 installed in the pipe installation cavity 124; and at least one smoke baffle 14, one end or both ends of the fin group 12 are provided with the smoke baffle 14 along the first direction, one smoke baffle 14 is provided with a liquid inlet 142, and one smoke baffle 14 is provided with a liquid outlet 144, the liquid inlet 142 and the liquid outlet 144 are respectively connected to two ends of the heat exchange pipe 13; wherein the gas water heater 2 can generate flue gas, the flue gas can pass through the fin group 12 and exchange heat with the heat exchange pipe 13.

[0088] In the technical solution, the heat exchange assembly 1 further comprises the heat exchange pipe 13 and the at least one smoke baffle 14, the heat exchange pipe 13 is installed in the pipe installation cavity 124, one end or both ends of the fin group 12 are provided with the smoke baffle 14 along the first direction, one smoke baffle 14 is provided with the liquid inlet 142, and one smoke baffle 14 is provided with the liquid outlet 144, the liquid inlet 142 and the liquid outlet 144 are respectively connected to two ends of the heat exchange pipe 13. In addition, the gas water heater 2 can generate flue gas, the flue gas can pass through the fin group 12 from the bottom of the fin group 12 and exchange heat with the heat exchange pipe 13. Since at least one end of the fin group 12 is provided with the smoke baffle 14, when the flue gas passes through the fin group 12 and exchanges heat with the heat exchange pipe 13, the presence of the smoke baffle 14 can avoid the flue gas from spreading to the side where the smoke baffle 14 is located as much as possible, so as to make the flue gas contact with the fin group 12 as much as possible, thereby improving the heat exchange coefficient of the heat exchange pipe 13.

[0089] In some embodiments, the at least one baffle 14 includes a first baffle 146 and a second baffle 148, the first baffle 146 and the second baffle 148 are arranged at two ends of the fin group 12 along the first direction, the inlet 142 is arranged on the first baffle 146 or the second baffle 148, and the outlet 144 is arranged on the first baffle 146 or the second baffle 148.

[0090] In this embodiment, the number of baffles 14 is two, which are arranged at two ends of the fin group 12, the inlet 142 is arranged on one of the two baffles 14, and the outlet 144 is arranged on the other baffle 14. By arranging the baffles 14 at two ends of the fin group 12, the smoke can be further concentrated on the fin group 12, thereby further improving the heat exchange coefficient.

[0091] In some embodiments, the inlet 142 and the outlet 144 are arranged on the first baffle 146.

[0092] In this embodiment, the inlet 142 and the outlet 144 are arranged on the same baffle 14, i.e., on the same side of the fin 122, which is more conducive to the arrangement of the waterway.

[0093] In some embodiments, the fin group 12 is welded to the heat exchange pipe 13.

[0094] In this embodiment, the fin group 12 is welded to the heat exchange pipe 13, which can improve the connection strength between the two and avoid the heat exchange pipe 13 from falling off the fin group 12.

[0095] In some embodiments, as shown in Figure 4 and Figure 5 The heat exchange pipe 13 includes four straight pipes 132, a first elbow pipe 134, a second elbow pipe 136, and a third elbow pipe 138. The four straight pipes 132 are arranged along the first direction. Each straight pipe 132 includes a first interface 1322 and a second interface 1324. The two ends of the first elbow pipe 134 are connected to the first interfaces 1322 of two of the four straight pipes 132. The two ends of the second elbow pipe 136 are connected to the first interfaces 1322 of the other two of the four straight pipes 132. The two ends of the third elbow pipe 138 are connected to the second interfaces 1324 of two of the four straight pipes 132. One of the second interfaces 1324 of the other two straight pipes 132 is connected to the inlet 142, and the other second interface 1324 is connected to the outlet 144.

[0096] In the technical scheme, the heat exchange pipe 13 comprises four straight pipes 132 and three bent pipes, the four straight pipes 132 are arranged along the first direction, each straight pipe 132 has a first interface 1322 and a second interface 1324 along the first direction, and the four straight pipes 132 are arranged inside the pipe installation cavity 124, the three bent pipes can all be U-shaped pipes and are arranged outside the pipe installation cavity 124, two ends of the first bent pipe 134 are connected to the first interfaces 1322 of two straight pipes 132 of the four straight pipes 132, two ends of the second bent pipe 136 are connected to the first interfaces 1322 of the other two straight pipes 132 of the four straight pipes 132, two ends of the third bent pipe 138 are connected to the second interfaces 1324 of two straight pipes 132 of the four straight pipes 132, one of the second interfaces 1324 of the other two straight pipes 132 is connected to the liquid inlet 142, and the other second interface 1324 is connected to the liquid outlet 144, so that the four straight pipes 132 and the three bent pipes form a complete heat exchange pipe 13.

[0097] As shown in Figure 8 The second aspect of the utility model provides a kind of gas water heater 2, comprising: the heat exchange assembly 1 as any one of the first aspect of the utility model provides. Since the gas water heater 2 provided by the utility model includes the heat exchange assembly 1 provided by any one of the first aspect of the utility model, it has all the beneficial effects of the heat exchange assembly 1 provided by any one of the first aspect of the utility model, which will not be repeated here.

[0098] In some technical schemes, optionally, the gas water heater 2 is a fanless gas water heater, that is, the gas water heater 2 of the application does not have a fan. Due to the fin structure of the application, the surface has no complex spoiler structure, so that the resistance of the flue gas flow is reduced, and the resistance loss of the flue gas flowing through the heat exchanger is reduced. It can be understood that the current gas water heater 2 is usually a gas water heater with a fan. Therefore, due to the existence of the fan, the resistance of the fin to the airflow does not need to be considered, and only the airflow and the fin need to have good heat exchange. Therefore, under normal circumstances, the current fin structure has many spoiler structures on the surface to increase the contact area of the flue gas and the fin. The gas water heater 2 of the application is fanless, and the fin structure of the application has no complex spoiler structure on the surface. Therefore, in the case of no fan, the flue gas after heat exchange can also be discharged well.

[0099] Another embodiment of the present application provides a heat exchange assembly 1. It is understood that in the gas water heater industry, in order to reduce the smoke resistance of the copper heat exchange assembly under the condition of no fan, the method of reducing the surface turbulence structure of the heat exchange fin is usually adopted. Since the surface turbulence structure of the heat exchange fin is reduced, the convection heat transfer coefficient of the fin surface is reduced, which leads to the decrease of the thermal efficiency of the gas water heater. Therefore, a fin is needed to be designed to reduce the smoke resistance and improve the thermal efficiency of the heat exchange assembly when applied to the fanless gas water heater.

[0100] As shown in Figure 1 and Figure 6 The heat exchange assembly 1 of the present embodiment mainly consists of heat exchange fins 122 and heat exchange pipes 13. A certain number of heat exchange fins 122 are sleeved on the heat exchange pipes 13 and fixed by welding. A certain number of heat exchange pipes 13 are fixed by end plates (i.e. smoke baffle plates 14). Long U-shaped heat exchange pipes (i.e. second bent pipes 136) and small U-shaped heat exchange pipes (i.e. first bent pipes 134) are connected into a water flow passage through semicircular pipes (i.e. third bent pipes 138). The semicircular pipes and straight pipes 132 are welded and fixed.

[0101] Optionally, the upper and lower edges of the fin 122 present a convex-concave staggered wave type, the pipe holes present two rows of staggered arrangement, the diameter of the pipe hole is 8mm to 16mm, the distance between the adjacent two pipe holes is 20mm to 30mm, and a flange hole (i.e. through hole 156) is arranged between the adjacent two pipe holes, the flange height is 1mm to 2mm, and the smoke baffle plate 14 is arranged at the left and right ends of the fin 122.

[0102] The working principle of the heat exchange assembly 1 of the gas water heater 2 is that the heat exchange fins 122 and the heat exchange pipes 13 absorb heat from the flue gas and transfer the heat to the water in the heat exchange pipes 13, thereby increasing the temperature of the water. The main heat transfer mode between the flue gas and the heat exchange assembly 1 is the convection heat transfer between the flue gas and the fin 122. According to the theory of heat transfer, there are two methods to increase the heat exchange amount of convection heat transfer, i.e. increasing the heat exchange area and improving the convection heat transfer coefficient. Therefore, in order to improve the thermal efficiency of the gas water heater 2, the contact area between the flue gas and the fin 122 can be increased, and the turbulence degree of the flue gas flowing through the surface of the fin 122 can be improved.

[0103] By the scheme, since the upper and lower edges of the fin 122 present the concave-convex alternating wave type structure, compared with the existing fin 122, the area between the adjacent two tube holes of the wave type fin 122 is larger, the contact area between the flue gas and the fin 122 is increased, and the flue gas is disturbed by the flanging hole between the adjacent two tube holes, so that the convective heat transfer coefficient of the surface of the fin 122 is improved. By adopting the wave type structure and the flanging hole, the heat exchange area of the fin 122 and the heat exchange coefficient of the flue gas side are increased, according to the simulation results, as shown in Table 1 below, compared with the existing fin, under the condition that the number of the fin 122 is the same, the heat efficiency of the heat exchanger adopting the scheme is increased by 4.72%.

[0104] By the scheme, compared with the existing fin, since the upper and lower edges of the fin 122 present the concave-convex alternating wave type structure, in the gas water heater 2 without the fan, the flow channel of the flue gas between the adjacent two heat exchange tubes 13 is widened, and the surface of the fin 122 has no complex disturbance structure, so that the resistance of the flue gas flow is reduced, the resistance loss of the flue gas before and after flowing through the heat exchanger is reduced, according to the simulation results, as shown in Table 1 below, compared with the existing fin, the smoke resistance of the fin 122 structure adopting the scheme can be reduced by 12.67%, and since there is no complex disturbance structure, the heat accumulation in the combustion chamber is reduced.

[0105] Table 1

[0106] Number of fins Maximum fin temperature Thermal efficiency Flue gas resistance Pa Reference fin 84 213.24℃ 82.13％ 3.00 Corrugated fin of the present application 84 194.66℃ 86.85％ 2.62 Difference 0 -18.58％ 4.72％ -12.67％

[0107] The wave type fin structure of the scheme improves the heat efficiency of the gas water heater 2 without the fan, and reduces the smoke resistance.

[0108] In the embodiments according to the utility model, the terms "first", "second", "third" are only used for the aspect of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connecting" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments according to the utility model can be understood according to the specific circumstances.

[0109] Moreover, while operations are depicted in a particular order, this should not be understood as requiring such an order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing can be advantageous. Likewise, while several specific implementation details are contained in the above discussion, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of particular implementations. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination.

[0110] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

[0111] The above merely provides example embodiments according to the embodiments of the present application, and is not intended to limit the embodiments of the present application. For those skilled in the art, the embodiments of the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A heat exchange assembly, characterized by The heat exchange assembly is applied to a gas water heater and comprises: A fin group comprising a plurality of fins arranged in a first direction, a gas passage being formed between any two adjacent fins, and a plurality of pipe holes being arranged on the fins to form a pipe installation cavity; The fin comprises an air inlet section, an air outlet section and an intermediate section between the air inlet section and the air outlet section, and the plurality of pipe holes are arranged on the intermediate section; In the first direction, the minimum width of the gas passage at the air outlet section is greater than the minimum width of the gas passage at the intermediate section.

2. The heat exchange assembly of claim 1, wherein, The width of the gas passage at the air outlet section is constant.

3. The heat exchange assembly of claim 1, wherein, The gas water heater can generate flue gas, the flue gas can pass through the fin group in a second direction and exchange heat with the fin group, and the fin at the air outlet section is a flat structure extending in the second direction.

4. The heat exchange assembly of claim 3, wherein, The fin at the air inlet section is a flat structure extending in the second direction.

5. The heat exchange assembly of claim 1, wherein, The fin is in a corrugated shape, and a plurality of fins are arranged in the first direction to form the fin group.

6. The heat exchange assembly of claim 5, wherein, The fin comprises an upper convex section and a lower concave section, the upper convex section is provided with a first pipe hole, the first pipe holes of a plurality of fins form a first pipe installation cavity, the lower concave section is provided with a second pipe hole, and the second pipe holes of a plurality of fins form a second pipe installation cavity.

7. The heat exchange assembly according to claim 6, wherein: An edge of the fin close to the first pipe hole is provided with a first flange, the first flange is bent to one side of the adjacent fin, and the first flange is arranged on the intermediate section; and / or An edge of the fin close to the second pipe hole is provided with a second flange, the second flange is bent to one side of the adjacent fin, and the second flange is arranged on the intermediate section.

8. The heat exchange assembly of claim 6, wherein, The fin is further provided with a through hole between the first pipe hole and the second pipe hole, an edge of the fin close to the through hole is provided with a third flange, and the third flange is bent to one side of the adjacent fin.

9. The heat exchange assembly of claim 8, wherein, The length of the third flange in the bending direction is greater than or equal to 1 mm and less than or equal to 2 mm.

10. The heat exchange assembly according to claim 6, wherein: The diameter of the first pipe hole is greater than or equal to 8 mm and less than or equal to 16 mm; and / or The diameter of the second pipe hole is greater than or equal to 8 mm and less than or equal to 16 mm; And / or The first pipe hole and the second pipe hole are arranged alternately; and / or The distance between the centers of adjacent first pipe holes and second pipe holes is greater than or equal to 20 mm and less than or equal to 30 mm.

11. The heat exchange assembly of any one of claims 1 to 10, wherein, Further comprising: A heat exchange pipe installed in the pipe installation cavity; At least one smoke baffle, one end or both ends of the fin group are provided with the smoke baffle in the first direction, one of the smoke baffles is provided with a liquid inlet, and one of the smoke baffles is provided with a liquid outlet, and the liquid inlet and the liquid outlet are respectively connected to two ends of the heat exchange pipe; The gas water heater can generate flue gas, and the flue gas can pass through the fin group and exchange heat with the heat exchange pipe.

12. The heat exchange assembly of claim 11, wherein, At least one of the smoke baffle plates comprises a first smoke baffle plate and a second smoke baffle plate, the first smoke baffle plate and the second smoke baffle plate are arranged at two ends of the fin group along the first direction, the liquid inlet is arranged on the first smoke baffle plate or the second smoke baffle plate, and the liquid outlet is arranged on the first smoke baffle plate or the second smoke baffle plate.

13. The heat exchange assembly of claim 12, wherein, The liquid inlet and the liquid outlet are arranged on the first smoke baffle plate.

14. The heat exchange assembly of claim 11, wherein, The fin group is welded to the heat exchange pipe.

15. The heat exchange assembly of claim 11, wherein, The heat exchange pipe comprises four straight pipes, a first elbow pipe, a second elbow pipe and a third elbow pipe, the four straight pipes are arranged along the first direction, each of the straight pipes comprises a first interface and a second interface, two ends of the first elbow pipe are connected to the first interfaces of two of the four straight pipes, two ends of the second elbow pipe are connected to the first interfaces of the other two of the four straight pipes, two ends of the third elbow pipe are connected to the second interfaces of two of the four straight pipes, one of the second interfaces of the other two straight pipes is connected to the liquid inlet, and the other second interface is connected to the liquid outlet.

16. A gas water heater, characterized by, The heat exchange assembly comprises: The heat exchange assembly according to any one of claims 1 to 15.

17. The gas water heater of claim 16, wherein, The gas water heater comprises a gas water heater without a fan.

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