Heat exchanger and gas heat exchange device

Abstract

The application belongs to the technical field of household appliances, and particularly relates to a heat exchanger and a gas heat exchange device. The heat exchanger comprises a shell and a heat exchange assembly, a smoke cavity is arranged in the shell, and the heat exchange assembly is arranged in the smoke cavity. The shell is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with a liquid inlet end of the heat exchange assembly, and the liquid outlet is communicated with a liquid outlet end of the heat exchange assembly. The heat exchange assembly comprises a plurality of heat exchange pipe groups, and the plurality of heat exchange pipe groups are sequentially communicated from the liquid inlet end of the heat exchange assembly to the liquid outlet end of the heat exchange assembly. A plurality of mounting areas are arranged in the smoke cavity, and the heat exchange pipe groups are correspondingly arranged in the mounting areas. Each heat exchange pipe group comprises a plurality of heat exchange pipes, and the pipe spacing of the adjacent two heat exchange pipes is different in at least part of the adjacent two mounting areas. The heat exchanger and the gas heat exchange device provided in the application can improve the heat exchange efficiency of the heat exchanger and the flue gas.

Description

Technical Field

[0001] This application belongs to the field of household appliance technology, specifically relating to a heat exchanger and a gas heat exchange device. Background Technology

[0002] There are two main types of condensing heat exchangers for gas-fired boilers: one is an integrated condensing heat exchanger, which undertakes both main heat exchange and condensing heat exchange and is mostly used in fully premixed condensing boilers; the other is a flue gas recovery type condensing heat exchanger, which only undertakes high-temperature flue gas condensing heat exchange.

[0003] Flue gas recovery condensing heat exchangers are typically installed in the exhaust duct of gas-fired boilers, downstream of the combustion chamber. The high-temperature flue gas generated by combustion first flows through the combustion chamber and then enters the flue gas recovery condensing heat exchanger. The heat exchanger contains heat exchange pipes filled with a heat exchange medium (such as water). When the high-temperature flue gas flows through these pipes, heat is transferred to the heat exchange medium through the pipe walls. In this way, the flue gas recovery condensing heat exchanger achieves the recovery and utilization of waste heat from the flue gas.

[0004] However, flue gas recovery condensing heat exchangers have low heat exchange efficiency with flue gas. Utility Model Content

[0005] This application provides a heat exchanger and a gas heat exchange device that can improve the heat exchange efficiency between the heat exchanger and the flue gas.

[0006] In a first aspect, this application provides a heat exchanger, including a shell and a heat exchange assembly, wherein a flue chamber is provided inside the shell, and the heat exchange assembly is disposed inside the flue chamber;

[0007] The housing is provided with a liquid inlet and a liquid outlet. The liquid inlet is connected to the liquid inlet end of the heat exchange component, and the liquid outlet is connected to the liquid outlet end of the heat exchange component.

[0008] The heat exchange assembly includes multiple heat exchange tube groups, which are connected sequentially from the liquid inlet end to the liquid outlet end of the heat exchange assembly.

[0009] The flue chamber is provided with multiple installation areas, and the heat exchange tube group is correspondingly arranged in the installation area; each heat exchange tube group includes multiple heat exchange tubes, and the tube spacing between two adjacent heat exchange tubes is different in at least some of the two adjacent installation areas.

[0010] In one possible design, at least some of the heat exchange tubes in two adjacent installation areas have different diameters.

[0011] In one possible design, at least one of the plurality of heat exchanger tube groups includes a plurality of first heat exchanger tubes and a plurality of second heat exchanger tubes;

[0012] The first heat exchange tube and the second heat exchange tube have different diameters.

[0013] In one possible design, at least one of the plurality of heat exchanger tube groups includes a plurality of first heat exchanger tubes and a plurality of second heat exchanger tubes;

[0014] The spacing between two adjacent first heat exchange tubes in a plurality of first heat exchange tubes is different from the spacing between two adjacent second heat exchange tubes in a plurality of second heat exchange tubes.

[0015] In one possible design, a baffle is provided inside the housing, which divides the smoke chamber into a first chamber and a second chamber;

[0016] The housing is provided with a smoke inlet and a smoke outlet, the first chamber is connected to the smoke inlet, and the second chamber is connected to the smoke outlet;

[0017] The baffle is provided with a communication port, through which the first chamber and the second chamber are connected;

[0018] Some of the heat exchange tube assemblies are located in the first chamber, and the rest are located in the second chamber.

[0019] In one possible design, from the liquid inlet end of the heat exchange component to the liquid outlet end of the heat exchange component, the plurality of heat exchange tube groups include a first part of heat exchange tube groups and a second part of heat exchange tube groups.

[0020] The first part of the heat exchange tube assembly is disposed in the second chamber, and the first part of the heat exchange tube assembly is disposed near the flue gas outlet;

[0021] The second heat exchange tube assembly is disposed in the first chamber, and the second heat exchange tube assembly is disposed near the flue gas inlet.

[0022] In one possible design, the direction of the flue gas inlet is at an angle to the axial direction of the heat exchange tube.

[0023] In one possible design, the plurality of heat exchanger tube assemblies includes several inlet tube assemblies and several outlet tube assemblies;

[0024] The housing includes a first connecting structure and a second connecting structure, the first connecting structure including a plurality of first connecting cavities, and the second connecting structure including a plurality of second connecting cavities;

[0025] The first connecting cavity can connect the inlet of the adjacent inlet pipe group and the outlet of the outlet pipe group; the second connecting cavity can connect the outlet of the adjacent inlet pipe group and the inlet of the outlet pipe group.

[0026] The inlet and the outlet are located in the first connecting structure.

[0027] In one possible design, the average diameter of the inlet pipe assembly is smaller than the average diameter of the outlet pipe assembly.

[0028] Secondly, this application provides a gas heat exchange device, including a combustion chamber and a flue gas passage, wherein the combustion chamber is connected to the flue gas passage, and any of the above-mentioned heat exchangers are provided in the flue gas passage.

[0029] The heat exchanger and gas heat exchange device provided in this application include a shell and a heat exchange assembly. A flue gas chamber is provided within the shell, and the heat exchange assembly is disposed within the flue gas chamber. The shell has a liquid inlet and a liquid outlet, with the liquid inlet connected to the liquid inlet end of the heat exchange assembly and the liquid outlet connected to the liquid outlet end of the heat exchange assembly. The heat exchange assembly includes multiple heat exchange tube groups, which are sequentially connected from the liquid inlet end to the liquid outlet end of the heat exchange assembly. Multiple installation areas are provided within the flue gas chamber, and the heat exchange tube groups are correspondingly disposed within these installation areas. Each heat exchange tube group includes multiple heat exchange tubes, and at least in some adjacent installation areas, the spacing between adjacent heat exchange tubes is different. By changing the spacing between the heat exchange tubes in adjacent installation areas, turbulence can be generated during the flow of flue gas within the heat exchanger, thereby reducing the flue gas velocity and increasing its residence time within the heat exchanger. This increases the contact time between the flue gas and the heat exchange tubes, achieving sufficient heat exchange between the flue gas and the heat exchange tubes, improving heat exchange efficiency, and enabling the full recovery and utilization of waste heat from the flue gas. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of this application;

[0032] Figure 2 for Figure 1 A schematic diagram of the heat exchanger from another perspective;

[0033] Figure 3 for Figure 1 A schematic diagram of the shell structure of the heat exchanger in the diagram;

[0034] Figure 4 for Figure 1 Schematic diagram of the heat exchange assembly inside the middle shell;

[0035] Figure 5 for Figure 3 Schematic diagram of the middle baffle;

[0036] Figure 6 for Figure 1 An exploded view of the heat exchanger.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100 - Shell; 101 - Smoke chamber; 1011 - First chamber; 1012 - Second chamber;

[0039] 110 - Liquid Inlet;

[0040] 120-liquid outlet;

[0041] 130 - Baffle; 131 - Connecting port; 132 - Flow guide flange;

[0042] 140 - Smoke inlet;

[0043] 150 - Smoke outlet;

[0044] 160 - First connecting structure; 161 - First connecting cavity; 1611 - First connecting region; 1612 - Second connecting region; 1613 - Third connecting region; 1614 - Fourth connecting region; 162 - First end plate;

[0045] 170 - Second connecting structure; 171 - Second connecting cavity; 1711 - Fifth connecting region; 1712 - Sixth connecting region; 1713 - Seventh connecting region; 172 - Second end plate;

[0046] 200 - Heat exchanger assembly;

[0047] 210 - First heat exchanger tube assembly; 211 - First heat exchanger tube assembly; 212 - Second heat exchanger tube assembly; 213 - Third heat exchanger tube assembly; 2131 - First heat exchanger tube; 2132 - Second heat exchanger tube;

[0048] 220 - Second heat exchanger tube group; 221 - Fourth heat exchanger tube group; 222 - Fifth heat exchanger tube group; 223 - Sixth heat exchanger tube group;

[0049] 230 - Inlet pipe assembly;

[0050] 240 - Discharge pipe assembly;

[0051] 300 - Mounting bracket.

[0052] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0055] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0056] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0057] Unless otherwise stated, the term "multiple" means two or more.

[0058] As can be seen from the background technology, the condensing heat exchangers of gas-fired heating boilers are mainly divided into two types: one is an integrated condensing heat exchanger, which undertakes both main heat exchange and condensing heat exchange, and is mostly used in fully premixed condensing heating boilers; the other is a flue gas recovery type condensing heat exchanger, which only undertakes high-temperature flue gas condensing heat exchange.

[0059] Flue gas recovery condensing heat exchangers are typically installed in the exhaust duct of gas-fired boilers, downstream of the combustion chamber. The high-temperature flue gas generated by combustion first flows through the combustion chamber and then enters the flue gas recovery condensing heat exchanger. The heat exchanger contains heat exchange pipes filled with a heat exchange medium (such as water). When the high-temperature flue gas flows through these pipes, heat is transferred to the heat exchange medium through the pipe walls. In this way, the flue gas recovery condensing heat exchanger achieves the recovery and utilization of waste heat from the flue gas.

[0060] In related technologies, the heat exchange tubes in a heat exchange pipeline are usually arranged with a uniform diameter. The uniform tube diameter and spacing will form a regular straight flow channel. Driven by the pressure difference, the flue gas tends to choose the path of least resistance. If the flue gas velocity is too fast, the residence time in the heat exchanger is short, which is not conducive to sufficient heat exchange with the heat exchange tubes.

[0061] It is evident that the heat exchanger has low heat exchange efficiency with the flue gas, which is not conducive to the full recovery and utilization of the waste heat of the flue gas.

[0062] To address the aforementioned problems, this application provides a heat exchanger and a gas heat exchange device. The heat exchanger includes a shell and a heat exchange assembly. A flue gas chamber is provided within the shell, and the heat exchange assembly is disposed within the flue gas chamber. The shell has a liquid inlet and a liquid outlet, with the liquid inlet communicating with the liquid inlet end of the heat exchange assembly and the liquid outlet communicating with the liquid outlet end of the heat exchange assembly. The heat exchange assembly includes multiple heat exchange tube groups, which are sequentially connected from the liquid inlet end to the liquid outlet end of the heat exchange assembly. Multiple installation areas are provided within the flue gas chamber, and the heat exchange tube groups are correspondingly disposed within these installation areas. Each heat exchange tube group includes multiple heat exchange tubes, and the spacing between adjacent heat exchange tubes in at least two adjacent installation areas is different. By changing the spacing between the heat exchange tubes in adjacent installation areas, turbulence can be generated during the flow of flue gas inside the heat exchanger. Turbulence reduces the flow rate of flue gas and increases its residence time in the heat exchanger, thereby increasing the contact time between the flue gas and the heat exchange tubes. This allows for more efficient heat exchange between the flue gas and the heat exchange tubes, improving heat exchange efficiency and enabling full recovery and utilization of waste heat from the flue gas.

[0063] The technical solutions of this application and how they solve the aforementioned technical problems are described in detail below with specific embodiments. These specific embodiments may exist independently or in combination with each other. Identical or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0064] One embodiment of this application provides a gas heat exchange device, which includes, but is not limited to, gas boilers, gas water heaters, and gas stoves with heat recovery systems.

[0065] The gas heat exchanger is equipped with a combustion chamber where the gas is burned, releasing chemical energy and converting it into heat energy, which is then transferred to the target system through the heat exchange medium (water / air).

[0066] Gas-fired heat exchangers are also equipped with flue gas ducts, through which the flue gas generated after combustion can be discharged from the heat exchanger. However, the discharged flue gas carries a large amount of heat energy. Direct discharge not only wastes energy resources but also increases the emission of greenhouse gases and pollutants, negatively impacting the environment. By recovering and utilizing the waste heat in the flue gas, the overall thermal efficiency of the equipment can be significantly improved, fuel consumption reduced, and operating costs decreased.

[0067] To recover and utilize the waste heat in the flue gas, a heat exchanger is usually installed in the flue gas exhaust channel of the gas heat exchange device. The heat exchanger includes a shell 100 and a heat exchange component 200. A flue gas chamber 101 is provided inside the shell 100, and the heat exchange component 200 is disposed inside the flue gas chamber 101. The shell 100 is provided with a liquid inlet 110 and a liquid outlet 120. The liquid inlet 110 is connected to the liquid inlet end of the heat exchange component 200, and the liquid outlet 120 is connected to the liquid outlet end of the heat exchange component 200.

[0068] The housing 100 provides a closed environment, allowing the flue gas to flow within the flue gas chamber 101 and exchange heat with the heat exchange assembly 200. The liquid inlet 110 and liquid outlet 120 of the housing 100 allow the heat exchange medium to flow within the heat exchange assembly 200, thereby removing heat from the flue gas and achieving effective heat transfer.

[0069] The heat exchange assembly 200 includes multiple heat exchange tube groups, which are connected sequentially from the liquid inlet end to the liquid outlet end of the heat exchange assembly 200. Multiple installation areas are provided in the flue chamber 101, and the heat exchange tube groups are correspondingly installed in the installation areas. Each heat exchange tube group includes multiple heat exchange tubes, and the tube spacing between two adjacent heat exchange tubes is different in at least two adjacent installation areas.

[0070] By changing the tube spacing of the heat exchange tubes in adjacent installation areas, the flue gas flow path is no longer a simple straight line, but is disturbed. This disturbance reduces the flow velocity of the flue gas in the heat exchanger, increases the contact time with the heat exchange tubes, and enables full heat exchange between the flue gas and the heat exchange tubes, thereby improving heat exchange efficiency and achieving full recovery and utilization of the waste heat of the flue gas.

[0071] The gas heat exchange device provided in this application embodiment can more fully recover and utilize the waste heat of flue gas, which not only helps to improve energy utilization efficiency, but also helps to reduce the emission temperature of the gas heat exchange device, thereby improving the economy and environmental protection of the overall system.

[0072] Combination Figures 1 to 4As shown, another aspect of this application provides a heat exchanger, including a shell 100 and a heat exchange assembly 200. A flue gas chamber 101 is provided within the shell 100, and the heat exchange assembly 200 is disposed within the flue gas chamber 101. The shell 100 is provided with a liquid inlet 110 and a liquid outlet 120. The liquid inlet 110 is connected to the liquid inlet end of the heat exchange assembly 200, and the liquid outlet 120 is connected to the liquid outlet end of the heat exchange assembly 200. The heat exchange assembly 200 includes multiple heat exchange tube groups, which are sequentially connected from the liquid inlet end to the liquid outlet end of the heat exchange assembly 200. Multiple installation areas are provided within the flue gas chamber 101, and the heat exchange tube groups are correspondingly disposed within these installation areas. Each heat exchange tube group includes multiple heat exchange tubes.

[0073] Understandably, the flue chamber 101 is the space inside the shell 100 used to contain flue gas. The shell 100 is provided with a flue gas inlet 140 and a flue gas outlet 150. The flue gas inlet 140 is connected to the combustion chamber of the gas heat exchange device. The flue gas generated after the gas is burned in the combustion chamber enters the flue chamber 101 through the flue gas inlet 140.

[0074] Flue gas flows from the inlet 140 to the outlet 150 within the flue gas chamber 101. During the flow, the flue gas comes into contact with the outer surface of the heat exchange component 200 to exchange heat with the heat exchange component 200, thereby heating the heat exchange medium inside the heat exchange component 200.

[0075] The housing 100 is provided with a liquid inlet 110 and a liquid outlet 120, which are respectively connected to the liquid inlet end and the liquid outlet end of the heat exchange assembly 200. The heat exchange medium can flow into the heat exchange assembly 200 from the liquid inlet 110, pass through each heat exchange tube group in the heat exchange assembly 200 in sequence, and then flow out from the liquid outlet 120.

[0076] The heat exchange component 200 is located inside the flue gas chamber 101. When the heat exchange medium flows inside the heat exchange component 200, it can remove the heat from the flue gas, thus achieving effective heat transfer.

[0077] The heat exchange assembly 200 includes multiple heat exchange tube groups, and each heat exchange tube group is set in a different installation area within the flue chamber 101. This allows for control of the flue gas flow path, helps optimize the contact between the flue gas and the heat exchange tubes, and improves the heat exchange effect.

[0078] In some embodiments, the spacing between two adjacent heat exchange tubes is different in at least two partially adjacent installation areas.

[0079] Changing the tube spacing between heat exchanger tubes in adjacent installation areas will cause turbulence when the flue gas flows inside the heat exchanger. This turbulence reduces the flue gas velocity and increases its residence time within the heat exchanger. This arrangement increases the contact time between the flue gas and the heat exchanger tubes, thereby improving heat exchange efficiency.

[0080] Combination Figure 4As shown, in some embodiments, at least some of the heat exchange tubes in two adjacent installation areas have different diameters.

[0081] Understandably, heat exchange tubes of different diameters can cause changes in the velocity and flow direction of flue gas as it flows through them. These changes create eddies and disturbances in the flue gas, increasing the contact area and frequency between the flue gas and the tube wall. This allows heat to be transferred more effectively from the fluid to the tube wall, thereby heating the heat exchange medium inside the heat exchange tube.

[0082] By using different pipe diameters in different areas, the flow rate of flue gas can be controlled. In areas with smaller pipe diameters, the spacing between heat exchange tubes can be smaller. As the flue gas passes through the narrow gaps, its velocity is limited, increasing its residence time. This extended residence time allows the flue gas more time to exchange heat with the tube walls, thereby improving the efficiency of heat transfer, enabling more efficient heat recovery, and reducing heat energy waste.

[0083] Specifically, the flow characteristics of flue gas can be adjusted by using different combinations of pipe diameters and pipe spacing. For example, a combination of larger pipe diameters and larger pipe spacing is suitable for high-temperature, high-velocity regions within the flue gas chamber 101 to quickly reduce the flue gas temperature; while a combination of smaller pipe diameters and smaller pipe spacing is suitable for low-temperature, low-velocity regions within the flue gas chamber 101 to fully utilize the remaining temperature difference.

[0084] Combination Figure 4 As shown, in some embodiments, at least one of the plurality of heat exchanger tube groups includes a plurality of first heat exchanger tubes 2131 and a plurality of second heat exchanger tubes 2132; the first heat exchanger tubes 2131 and the second heat exchanger tubes 2132 have different diameters.

[0085] By setting different pipe diameters within the same heat exchanger tube group, the flow path and turbulence effect of the flue gas in the installation area can be further controlled, increasing the contact area and frequency between the flue gas and the tube wall, so that heat can be transferred more effectively from the fluid to the tube wall.

[0086] In some embodiments, the spacing between two adjacent first heat exchange tubes 2131 and the spacing between two adjacent second heat exchange tubes 2132 are different among a plurality of first heat exchange tubes 2131.

[0087] By setting different tube spacings within the same heat exchanger tube group, the velocity and direction of flue gas within the installation area can be further controlled, increasing the contact time of the flue gas and improving heat exchange efficiency.

[0088] Combination Figures 3 to 5As shown, in some embodiments, a baffle 130 is provided inside the housing 100, which divides the smoke chamber 101 into a first chamber 1011 and a second chamber 1012; the first chamber 1011 is connected to the smoke inlet 140, and the second chamber 1012 is connected to the smoke outlet 150; the baffle 130 is provided with a connecting port 131, through which the first chamber 1011 and the second chamber 1012 are connected; some heat exchange tubes are located in the first chamber 1011, and the remaining heat exchange tubes are located in the second chamber 1012.

[0089] By setting baffle 130, the flow path of flue gas in flue chamber 101 can be controlled. Flue gas entering from flue inlet 140 flows through first chamber 1011 and second chamber 1012 in sequence before flowing out, which can promote sufficient heat exchange between flue gas and each heat exchange tube group.

[0090] Specifically, after the flue gas enters the flue chamber 101 through the flue gas inlet 140, it can exchange heat with each heat exchange tube group located in the first chamber 1011 when it passes through the first chamber 1011, and then enters the second chamber 1012, where it exchanges heat with each heat exchange tube group located in the second chamber 1012, and finally flows out from the flue gas outlet 150.

[0091] In some embodiments, from the liquid inlet end to the liquid outlet end of the heat exchange component 200, the plurality of heat exchange tube groups include a first heat exchange tube group 210 and a second heat exchange tube group 220; the first heat exchange tube group 210 is disposed in the second chamber 1012 and is disposed near the flue gas outlet 150; the second heat exchange tube group 220 is disposed in the first chamber 1011 and is disposed near the flue gas inlet 140.

[0092] It should be noted that from the liquid inlet end of the heat exchange component 200 to the liquid outlet end of the heat exchange component 200, the multiple heat exchange tube groups include the first heat exchange tube group 211, the second heat exchange tube group 212, the third heat exchange tube group 213, the fourth heat exchange tube group 221, the fifth heat exchange tube group 222, and the sixth heat exchange tube group 223.

[0093] The first heat exchange tube group 210 includes a first heat exchange tube group 211, a second heat exchange tube group 212 and a third heat exchange tube group 213. Each heat exchange tube group is arranged sequentially in the second chamber 1012. The first heat exchange tube group 211 is located near the flue gas outlet 150, and the third heat exchange tube group 213 is located away from the flue gas outlet 150.

[0094] The second heat exchange tube group 220 includes a fourth heat exchange tube group 221, a fifth heat exchange tube group 222 and a sixth heat exchange tube group 223. Each heat exchange tube group is arranged sequentially in the first chamber 1011. The fourth heat exchange tube group 221 is located away from the flue gas inlet 140, and the sixth heat exchange tube group 223 is located close to the flue gas inlet 140.

[0095] Specifically, after the flue gas enters the flue chamber 101 through the flue gas inlet 140, it passes through the installation areas of the sixth heat exchange tube group 223, the fifth heat exchange tube group 222, the fourth heat exchange tube group 221, the third heat exchange tube group 213, the second heat exchange tube group 212 and the first heat exchange tube group 211 in sequence, and then flows out from the flue gas outlet 150.

[0096] For example, when the flue gas enters the first chamber 1011 through the flue gas inlet 140, the temperature is relatively high, and the driving force for heat transfer is relatively large. In the fourth heat exchange tube group 221, the fifth heat exchange tube group 222, and the sixth heat exchange tube group 223 located in the first chamber 1011, the average tube spacing and the average tube diameter can be set to be relatively large to reduce flow resistance, allow the flue gas to pass through quickly, and prevent excessively high temperatures from causing thermal stress problems in the material.

[0097] After passing through the first chamber 1011, the flue gas has already exchanged heat with part of the heat exchange tube group located in the first chamber 1011. When it reaches the second chamber 1012, the temperature has decreased, and the driving force for heat transfer is smaller. In the first heat exchange tube group 211, the second heat exchange tube group 212, and the third heat exchange tube group 213 located in the second chamber 1012, the average tube spacing and the average tube diameter can be set to be relatively small. Smaller tube spacing and tube diameter can increase the turbulence and residence time of the flue gas, thereby improving the heat exchange efficiency.

[0098] As the refrigerant flows from the inlet end to the outlet end of the heat exchange component 200, it gradually flows towards the higher temperature region, which helps to achieve sufficient heating of the refrigerant.

[0099] Combination Figures 3 to 5 As shown, in some embodiments, the end of the baffle 130 away from the housing 100 where the smoke inlet 140 is opened is provided with a guide flange 132, the guide flange 132 extends into the second chamber 1012, and the communication port 131 is provided near the guide flange 132.

[0100] The guide flange 132 can guide the flow direction of the flue gas, allowing it to flow more smoothly from the first chamber 1011 to the second chamber 1012. The position of the connecting port 131 near the guide flange 132 ensures that the flue gas can smoothly enter the second chamber 1012 when passing through the guide flange 132.

[0101] The guide flange 132 extends into the installation area where the third heat exchange tube group 213 is located, and the connecting port 131 is located between the installation areas where the third heat exchange tube group 213 and the fourth heat exchange tube group 221 are located.

[0102] Specifically, after the flue gas enters the flue chamber 101 through the flue gas inlet 140, it passes sequentially through the installation areas of the sixth heat exchange tube group 223, the fifth heat exchange tube group 222, and the fourth heat exchange tube group 221. Then, guided by the flow guide flange 132, it flows from the connecting port 131 to the installation area of ​​the third heat exchange tube group 213, and then sequentially through the installation areas of the second heat exchange tube group 212 and the first heat exchange tube group 211, and finally flows out from the flue gas outlet 150.

[0103] During this process, the flow path of the flue gas is optimized, allowing it to exchange heat sequentially with the sixth heat exchange tube group 223, the fifth heat exchange tube group 222, the fourth heat exchange tube group 221, the third heat exchange tube group 213, the second heat exchange tube group 212, and the first heat exchange tube group 211, thereby achieving full recovery of the waste heat from the flue gas.

[0104] It should be noted that the shape and number of the connecting ports 131 are not limited in this embodiment, as long as the flue gas can flow smoothly from the first chamber 1011 to the second chamber 1012.

[0105] The baffle 130 and the housing 100 can be connected by at least one of welding, plugging, snap-fit ​​connection and screw connection, as long as the positional stability of the baffle 130 can be achieved under the impact of flue gas. This application embodiment does not impose any restrictions on this.

[0106] Combination Figure 3 , Figure 4 and 6 As shown, in some embodiments, the multiple heat exchange tube assemblies include several inlet tube assemblies 230 and several outlet tube assemblies 240; the housing 100 includes a first connecting structure 160 and a second connecting structure 170, the first connecting structure 160 includes several first connecting cavities 161, and the second connecting structure 170 includes several second connecting cavities 171; the first connecting cavities 161 can connect the inlet of an adjacent inlet tube assembly 230 and the outlet of an outlet tube assembly 240; the second connecting cavities 171 can connect the outlet of an adjacent inlet tube assembly 230 and the inlet of an outlet tube assembly 240.

[0107] In the axial direction of the heat exchange tube, the housing 100 has a front side and a rear side that are oppositely arranged, and the housing 100 faces... Figure 6 The side indicated by the middle arrow X is the front side, with the housing 100 facing away from it. Figure 6 The side marked by the middle arrow X is the rear side.

[0108] Taking the front side of the housing 100 as an example, the housing 100 has a left side and a right side that are arranged opposite to each other. The smoke inlet 140 and the smoke outlet 150 are located on the left side of the housing 100. The baffle 130 divides the smoke chamber 101 into a first chamber 1011 and a second chamber 1012 arranged in the vertical direction. The first chamber 1011 is located below the second chamber 1012.

[0109] The first heat exchanger tube group 211, the second heat exchanger tube group 212 and the third heat exchanger tube group 213 are arranged from left to right in the second chamber 1012; the fourth heat exchanger tube group 221, the fifth heat exchanger tube group 222 and the sixth heat exchanger tube group 223 are arranged from right to left in the first chamber 1011.

[0110] Among them, the first heat exchanger tube group 211, the third heat exchanger tube group 213, and the fifth heat exchanger tube group 222 are all liquid inlet tube groups 230. In the liquid inlet tube group 230, the flow direction of the heat exchange medium is... Figure 6 The direction of the middle arrow X is opposite. The inlet of the liquid inlet pipe assembly 230 is close to the front side of the housing 100, and the outlet of the liquid inlet pipe assembly 230 is close to the rear side of the housing 100.

[0111] The second heat exchanger tube group 212, the fourth heat exchanger tube group 221, and the sixth heat exchanger tube group 223 are all liquid outlet tube groups 240. In the liquid outlet tube group 240, the flow direction of the heat exchange medium is parallel to... Figure 6 The direction of the middle arrow X is the same. The inlet of the liquid outlet pipe assembly 240 is close to the rear side of the housing 100, and the outlet of the liquid outlet pipe assembly 240 is close to the front side of the housing 100.

[0112] A first end plate 162 is installed on the front side of the housing 100. The first end plate 162 is provided with a communication port corresponding to each heat exchange tube of each heat exchange tube group. The end of the heat exchange tube near the front side of the housing 100 is correspondingly placed in the communication port.

[0113] The first connecting structure 160 is disposed on the side of the first end plate 162 away from the housing 100, and the several first connecting cavities 161 are mutually independent first connecting regions 1611, second connecting regions 1612, third connecting regions 1613 and fourth connecting regions 1614.

[0114] The first connecting region 1611 is connected to the end of each heat exchange tube in the first heat exchange tube group 211 near the front side of the shell 100; the second connecting region 1612 is connected to the end of each heat exchange tube in the second heat exchange tube group 212 and the third heat exchange tube group 213 near the front side of the shell 100; the third connecting region 1613 is connected to the end of each heat exchange tube in the fourth heat exchange tube group 221 and the fifth heat exchange tube group 222 near the front side of the shell 100; the fourth connecting region 1614 is connected to the end of each heat exchange tube in the sixth heat exchange tube group 223 near the front side of the shell 100.

[0115] A second end plate 172 is installed on the rear side of the shell 100. The second end plate 172 is also provided with a communication port corresponding to each heat exchange tube of each heat exchange tube group. The end of the heat exchange tube near the rear side of the shell 100 is correspondingly set in the communication port.

[0116] The second communication structure 170 is located on the side of the second end plate 172 away from the heat exchange tube assembly, and the several second communication cavities 171 are the fifth communication region 1711, the sixth communication region 1712 and the seventh communication region 1713 that are independent of each other.

[0117] The fifth connecting region 1711 is connected to the end of each heat exchange tube in the first heat exchange tube group 211 and the second heat exchange tube group 212 near the rear side of the shell 100; the sixth connecting region 1712 is connected to the end of each heat exchange tube in the third heat exchange tube group 213 and the fourth heat exchange tube group 221 near the rear side of the shell 100; the seventh connecting region 1713 is connected to the end of each heat exchange tube in the fifth heat exchange tube group 222 and the sixth heat exchange tube group 223 near the rear side of the shell 100.

[0118] In some embodiments, the inlet 110 and the outlet 120 are disposed in the first communication structure 160.

[0119] The liquid inlet 110 is connected to the first connecting area 1611, and the heat exchange medium flows in from the end of each heat exchange tube in the first heat exchange tube group 211 near the front side of the shell 100; the liquid outlet 120 is connected to the fourth connecting area 1614, and the heat exchange medium flows out from the end of each heat exchange tube in the sixth heat exchange tube group 223 near the front side of the shell 100.

[0120] The heat exchange medium flows through each heat exchange tube group in a reciprocating bending manner, with a relatively long flow path, which allows for sufficient heat exchange with the flue gas, thus achieving efficient recovery of waste heat from the flue gas.

[0121] In some embodiments, the average diameter of the inlet pipe assembly 230 is smaller than the average diameter of the outlet pipe assembly 240.

[0122] Understandably, a larger outlet pipe diameter allows for higher flow rates and lower flow resistance, while a smaller inlet pipe diameter increases the surface area and improves heat exchange efficiency.

[0123] In some embodiments, the flue gas inlet 140 has an angle with the axial direction of the heat exchange tube.

[0124] When flue gas enters the heat exchanger at a certain angle, it creates a more complex flow path between the heat exchange tubes. This complex flow path increases the turbulence effect of the flue gas, reducing its velocity within the heat exchanger and increasing its contact time with the heat exchange tubes.

[0125] The increased residence time of flue gas within the heat exchanger leads to a longer heat transfer time, thereby improving heat exchange efficiency. Sufficient contact between the flue gas and the heat exchange tubes also contributes to more effective heat recovery.

[0126] In some embodiments, a flue gas temperature limit sensor is provided at the flue gas outlet 150 for real-time monitoring of the flue gas temperature. When a problem occurs during the heat exchange process of the gas heat exchange device (such as incomplete combustion, insufficient heat exchange, or other malfunctions) causing the flue gas temperature to rise abnormally, the flue gas temperature limit sensor can detect that the flue gas temperature exceeds the safety limit, send a signal to the system, and the system triggers the safety mechanism.

[0127] In some embodiments, a condensate water level monitoring device may be provided inside the housing 100, and a condensate drain outlet may be provided at the bottom of the housing 100.

[0128] Understandably, during the heat exchange process, water vapor in the flue gas will condense into liquid water. This condensate needs to be discharged through the condensate drain at the bottom of the shell 100 to prevent water accumulation from affecting the performance and structure of the heat exchanger.

[0129] The condensate drain outlet is a dedicated outlet for discharging condensate and is located at the bottom of the housing 100. Under normal circumstances, the condensate can flow smoothly out of the equipment due to gravity.

[0130] The condensate level monitoring device is used to monitor the condensate level inside the shell 100 in real time. If the condensate cannot be discharged smoothly due to blockage of the drain pipe or other reasons, the condensate level monitoring device will detect an abnormal rise in the water level. When the condensate level exceeds the preset safety limit, the condensate level monitoring device will trigger an alarm or automatic shutdown mechanism to prevent condensate from overflowing or causing damage to the heat exchanger.

[0131] In some embodiments, a mounting bracket 300 is provided on the rear side of the housing 100, and the housing 100 can be mounted on the inner wall of the smoke exhaust duct by means of the mounting bracket 300.

[0132] For example, the mounting bracket 300 can be connected to the inner wall of the flue gas duct by at least one of the following structures: screw structure, snap-fit ​​structure, and plug-in structure, so as to achieve stable installation of the heat exchanger. This application embodiment does not impose any restrictions on this.

[0133] In summary, the heat exchanger provided in this application embodiment can adjust the flow characteristics of flue gas by changing the tube spacing and tube diameter of heat exchange tubes in adjacent installation areas, increasing the contact area and contact frequency between the flue gas and the tube wall. This allows heat to be transferred more effectively from the fluid to the tube wall, thereby heating the heat exchange medium inside the heat exchange tubes. Simultaneously, it can extend the residence time of the flue gas in the flue chamber 101, allowing more time for heat exchange with the tube wall, thus improving the efficiency of heat transfer and enabling more complete heat recovery, reducing heat energy waste.

[0134] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat exchanger, characterized in that, It includes a housing (100) and a heat exchange assembly (200), wherein a smoke chamber (101) is provided inside the housing (100), and the heat exchange assembly (200) is disposed inside the smoke chamber (101); The housing (100) is provided with a liquid inlet (110) and a liquid outlet (120). The liquid inlet (110) is connected to the liquid inlet end of the heat exchange component (200), and the liquid outlet (120) is connected to the liquid outlet end of the heat exchange component (200). The heat exchange assembly (200) includes multiple heat exchange tube groups, which are connected sequentially from the liquid inlet end of the heat exchange assembly (200) to the liquid outlet end of the heat exchange assembly (200). The flue chamber (101) is provided with multiple installation areas, and the heat exchange tube group is correspondingly arranged in the installation area; each heat exchange tube group includes multiple heat exchange tubes, and the tube spacing of two adjacent heat exchange tubes is different in at least two partially adjacent installation areas.

2. The heat exchanger according to claim 1, characterized in that, In two adjacent installation areas, at least some of the heat exchange tubes have different diameters.

3. The heat exchanger according to claim 1, characterized in that, At least one of the plurality of heat exchange tube groups includes a plurality of first heat exchange tubes (2131) and a plurality of second heat exchange tubes (2132); The first heat exchange tube (2131) and the second heat exchange tube (2132) have different diameters.

4. The heat exchanger according to claim 1, characterized in that, At least one of the plurality of heat exchange tube groups includes a plurality of first heat exchange tubes (2131) and a plurality of second heat exchange tubes (2132); The spacing between two adjacent first heat exchange tubes (2131) is different from the spacing between two adjacent second heat exchange tubes (2132) in the plurality of first heat exchange tubes (2131).

5. The heat exchanger according to any one of claims 1-4, characterized in that, A baffle (130) is provided inside the housing (100), and the baffle (130) divides the smoke chamber (101) into a first chamber (1011) and a second chamber (1012); The housing (100) is provided with a smoke inlet (140) and a smoke outlet (150), the first chamber (1011) is connected to the smoke inlet (140), and the second chamber (1012) is connected to the smoke outlet (150); The baffle (130) is provided with a communication port (131), through which the first chamber (1011) and the second chamber (1012) are connected; Some of the heat exchange tube assemblies are located in the first chamber (1011), and the rest of the heat exchange tube assemblies are located in the second chamber (1012).

6. The heat exchanger according to claim 5, characterized in that, From the liquid inlet end of the heat exchange assembly (200) to the liquid outlet end of the heat exchange assembly (200), the plurality of heat exchange tube groups include a first part of heat exchange tube group (210) and a second part of heat exchange tube group (220). The first heat exchange tube assembly (210) is disposed in the second chamber (1012), and the first heat exchange tube assembly (210) is disposed near the flue gas outlet (150); The second heat exchange tube assembly (220) is disposed in the first chamber (1011) and is disposed near the flue gas inlet (140).

7. The heat exchanger according to claim 5, characterized in that, The direction of the flue gas inlet (140) is at an angle to the axial direction of the heat exchange tube.

8. The heat exchanger according to any one of claims 1-4, characterized in that, The plurality of heat exchanger tube assemblies include several inlet tube assemblies (230) and several outlet tube assemblies (240); The housing (100) includes a first connecting structure (160) and a second connecting structure (170), wherein the first connecting structure (160) includes a plurality of first connecting cavities (161) and the second connecting structure (170) includes a plurality of second connecting cavities (171); The first connecting cavity (161) can connect the inlet of the adjacent liquid inlet pipe group (230) and the outlet of the liquid outlet pipe group (240); the second connecting cavity (171) can connect the outlet of the adjacent liquid inlet pipe group (230) and the inlet of the liquid outlet pipe group (240). The inlet (110) and the outlet (120) are disposed in the first connecting structure (160).

9. The heat exchanger according to claim 8, characterized in that, The average diameter of the inlet pipe assembly (230) is smaller than the average diameter of the outlet pipe assembly (240).

10. A gas heat exchange device, characterized in that, It includes a combustion chamber and a flue gas passage, wherein the combustion chamber is connected to the flue gas passage, and a heat exchanger as described in any one of claims 1-9 is provided in the flue gas passage.

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