Waste heat recovery device and gas water heater

Abstract

The utility model discloses a waste heat recovery device and a gas water heater, and relates to the technical field of water heaters, the waste heat recovery device comprises a shell, a guide plate and a waste heat exchanger shell, and the waste heat recovery device is provided with a cavity, a gas inlet and a gas outlet; the flow guide plate is arranged in the cavity and divides the cavity into a heat exchange cavity and a flow guide cavity which are communicated with each other; the air inlet is communicated with the heat exchange cavity, and the air outlet is communicated with the flow guide cavity; the waste heat exchanger is arranged in the heat exchange cavity. According to the technical scheme, through the arrangement of the flow guide plates, the flowing direction and speed distribution of airflow in the heat exchanger can be changed, the contact time and area of fluid and the heat exchange surface are increased, heat transfer is enhanced, and the waste gas waste heat recovery rate of the waste heat recovery device is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, and particularly to a waste heat recovery device and a gas water heater. Background Art

[0002] Gas water heaters are widely used in households and commercial fields. However, the demand for their high efficiency, energy conservation and environmental protection is increasing day by day. In this context, the waste heat recovery device has become a key technology to improve the overall energy efficiency of gas water heaters. However, the existing domestic waste heat recovery devices have problems such as limited heat exchange area, poor fluid flow, easy formation of dead angles and eddy current areas, and low waste heat recovery rate of flue gas. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a waste heat recovery device and a gas water heater, aiming to improve the waste heat recovery rate of the waste heat recovery device for waste gas.

[0004] To achieve the above object, the waste heat recovery device proposed by the utility model includes:

[0005] A housing provided with a cavity, an air inlet and an air outlet;

[0006] A baffle plate disposed in the cavity, the baffle plate dividing the cavity into a communicating heat exchange cavity and a diversion cavity; the air inlet is communicated with the heat exchange cavity, and the air outlet is communicated with the diversion cavity; and

[0007] A waste heat exchanger disposed in the heat exchange cavity, the waste heat exchanger being provided with a heat exchange channel for exchanging heat with the heat exchange cavity.

[0008] In one embodiment, the baffle plate includes a plate body and a bent portion connected by bending, and the bent portion is bent toward the side where the waste heat exchanger is located.

[0009] In one embodiment, the included angle between the plate body and the bent portion is not less than 90° and not more than 110°.

[0010] In one embodiment, the middle part of the plate body bulges toward the side of the heat exchange cavity.

[0011] In one embodiment, the baffle plate further includes a connecting portion, the connecting portion and the bent portion are disposed on the same side of the plate body; the connecting portion is connected to the housing.

[0012] In one embodiment, the waste heat exchanger has a water inlet and a water outlet communicated with the heat exchange channel, and the water outlet is disposed closer to the air inlet than the water inlet.

[0013] In one embodiment, the waste heat exchanger includes a heat exchange tube group and a connection assembly. The connection assembly includes a first connector provided at the water inlet end of the heat exchange tube group and a second connector provided at the water outlet end of the heat exchange tube group;

[0014] The first connector is provided with a water inlet cavity and the water inlet. The water inlet cavity is in communication with the water inlet. The second connector is provided with a water outlet cavity and the water outlet. The water outlet cavity is in communication with the water outlet;

[0015] The heat exchange tube group includes a plurality of tube bodies arranged side by side. The water inlet ends of the plurality of tube bodies are all in communication with the water inlet cavity, and the water outlet ends of the plurality of tube bodies are all in communication with the water inlet cavity.

[0016] In one embodiment, the connection assembly includes a third connector, and the third connector is provided with a communication cavity;

[0017] The heat exchange tube group includes a plurality of tube group segments, and the tube group segments are sequentially connected through the third connector. The plurality of tube bodies of each tube group segment are all in communication with the communication cavity to form the heat exchange channel.

[0018] In one embodiment, the plurality of tube group segments are arranged side by side.

[0019] In one embodiment, at opposite ends of the tube group segment, the connection assemblies located at the same end of the tube group segment are integrally formed.

[0020] In one embodiment, there are gaps between the plurality of tube bodies, between the plurality of tube bodies and the housing, and between the plurality of tube bodies and the guide plate;

[0021] In a cross-section taken perpendicular to the length direction of the tube group segment, the cross-sectional area of the guide cavity is not less than the sum of the cross-sectional areas of the gaps.

[0022] In one embodiment, the housing is further provided with a first installation opening, the first installation opening is in communication with the heat exchange cavity, the heat exchange tube group is installed into the heat exchange cavity from the first installation opening, and the connection assembly covers the first installation opening.

[0023] In one embodiment, the water inlet and the water outlet are provided on the side of the housing where the first installation opening is provided.

[0024] In one embodiment, the housing includes a housing body and an end plate; the air inlet, the exhaust port and the first installation opening are provided on the housing body. The housing body is further provided with a second installation opening. The first installation opening and the second installation opening are respectively provided on opposite sides of the housing body, and the end plate covers the second installation opening.

[0025] In one embodiment, the end plate is provided with a groove, the groove includes a first groove body and an annular groove body which are connected to each other, and the gap between the waste heat exchanger and the first groove body is not greater than 0.5 mm and not less than 1.0 mm;

[0026] And / or, the end plate is provided with a groove, the groove includes a first groove body and an annular groove body which are connected to each other, and the gap between the waste heat exchanger and the annular groove body is not greater than 0.3 mm and not less than 0.6 mm.

[0027] In one embodiment, the air inlet is strip-shaped and extends along the length direction of the shell body.

[0028] In one embodiment, the shell body includes a bottom plate and two side plates, the bottom plate is respectively connected to the two side plates, the bottom plate is inclined from its connection with one side plate to the connection with the other side plate, a drain port is provided at the lower side of the bottom plate, and the drain port is communicated with the heat exchange cavity.

[0029] In one embodiment, the length direction of the heat exchange tube group is arranged parallel to the bottom plate;

[0030] And / or, the plate body of the flow guide plate is arranged parallel to the bottom plate.

[0031] In one embodiment, the inclination angle of the bottom plate is not less than 5° and not greater than 10°.

[0032] The present utility model further provides a gas water heater, and the gas water heater includes the waste heat recovery device described in any one of the foregoing embodiments.

[0033] Through the arrangement of the flow guide plate, the technical solution of the present utility model can change the flow direction and velocity distribution of the air flow inside the heat exchanger, increase the contact time and area between the fluid and the heat exchange surface, strengthen the heat transfer, and improve the recovery rate of the waste heat of the exhaust gas by the waste heat recovery device. Secondly, by guiding the air flow through the flow guide plate, the air flow can be evenly distributed in the heat exchange cavity, avoiding air flow short circuit and local dead zones, thereby improving the heat exchange effect. Further, the arrangement of the flow guide plate can optimize the flow state of the fluid, reduce the eddy current and turbulence of the fluid, reduce the resistance of the fluid, and increase the stability and reliability of the system. In addition, by arranging the flow guide plate, the temperature non-uniformity of the fluid in the heat exchange cavity can also be reduced, and the temperature distribution of the fluid is more uniform during the heat exchange process. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0035] Figure 1 Schematic structural diagram of an embodiment of the waste heat recovery device provided by the present invention;

[0036] Figure 2 For Figure 1 exploded view of;

[0037] Figure 3 For Figure 1 cross-sectional view of a perspective;

[0038] Figure 4 For Figure 2 schematic structural diagram of an embodiment of the waste heat exchanger in;

[0039] Figure 5 For Figure 2 cross-sectional view of a perspective;

[0040] Figure 6 For Figure 5 partial enlarged view of.

[0041] Explanation of the reference numerals in the drawings:

[0042] 10. Waste heat recovery device;

[0043] 100. Housing; 101. Cavity; 101a. Heat exchange cavity; 101b. Diversion cavity; 102. Air inlet; 103. Exhaust port; 104. Drain port; 104. First mounting port; 105. Second mounting port; 110. Housing body; 111. Bottom plate; 112. Side plate; 113. Top plate; 120. End plate; 121. Groove; 122. First groove body; 123. Annular groove body;

[0044] 200. Deflector; 210. Plate body; 220. Bending part; 230. Connecting part;

[0045] 300. Waste heat exchanger; 310. Heat exchange tube group; 311. Tube group section; 320. Connecting component; 321. First connecting piece; 321a. Water inlet cavity; 321b. Water inlet; 322. Second connecting piece; 322a. Water outlet cavity; 322b. Water outlet; 323. Third connecting piece; 323a. Communication cavity.

[0046] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0048] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0049] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0050] The present utility model provides a waste heat recovery device, aiming to improve the recovery rate of waste heat of exhaust gas by the waste heat recovery device. For the convenience of understanding and description, in the specification appendix of the present utility model Figures 1 to 6 Spaces, grooves or holes are indicated by solid arrows.

[0051] Among them, the waste heat recovery device 10 can be applied to gas water heaters, boilers, steam systems, etc. Hereinafter, the application of the waste heat recovery device 10 to a gas water heater will be taken as an example for introduction.

[0052] Please refer to Figures 1 to 6, in an embodiment of the present utility model, the waste heat recovery device 10 includes a housing 100, a flow guide plate 200, and a waste heat exchanger 300. The housing 100 is provided with a cavity 101, an air inlet 102, and an exhaust outlet 103; the flow guide plate 200 is disposed in the cavity 101, and the flow guide plate 200 divides the cavity 101 into a connected heat exchange cavity 101a and a flow guide cavity 101b; the exhaust outlet 103 is communicated with the flow guide cavity 101b, and the air inlet 102 is communicated with the heat exchange cavity 101a; the waste heat exchanger 300 is disposed in the heat exchange cavity 101a, and the waste heat exchanger 300 is provided with a heat exchange channel for exchanging heat with the heat exchange cavity 101a.

[0053] Among them, a gas water heater usually includes a water heater main body, and the water heater main body usually includes a housing 100, a burner, a main heat exchanger, an ignition device, an electric control box, a control valve assembly, an expansion tank, etc. The burner, the main heat exchanger, the ignition device, the electric control box, the control valve assembly, and the expansion tank are usually disposed inside the housing 100. The burner is one of the core components of the gas water heater, responsible for mixing gas and air and burning to generate heat; the main heat exchanger is used to transfer the heat generated by the burner to the water flowing through it; the ignition device is used to ignite the gas in the burner, which can be electric spark ignition or thermocouple ignition; the electric control box is used to manage and control various electronic and electrical functions. The electric control box usually contains multiple circuit boards, sensor interfaces, control software, and other electronic components, and is responsible for coordinating various operations of the gas water heater.

[0054] Regarding the structure of the waste heat recovery device 10, the waste heat recovery device 10 usually includes a housing 100 and a waste heat exchanger 300. The housing 100 serves as the external shell of the waste heat recovery device 10 and plays a role in protecting the internal components. In some embodiments, the housing 100 has certain heat insulation performance, which can reduce heat dissipation, maintain the temperature of the hot water in the heat exchanger, improve energy utilization efficiency, and through the heat insulation and heat preservation setting of the housing 100, energy waste can be reduced, thereby further improving the recovery efficiency of the air flow. The waste heat exchanger 300 is the core component of the waste heat recovery device 10 and is used to transfer the waste heat discharged from the gas water heater to the cold water. The inside of the heat exchanger usually contains many pipes or sheet-like structures to increase the heat exchange surface area and improve the heat exchange efficiency.

[0055] The working process of the waste heat recovery device 10: When the gas water heater is working, gas and air are mixed and burned in the combustion chamber to generate high-temperature flue gas. These flue gases first pass through the main heat exchanger, and most of the heat is absorbed to heat the water, and the remaining heat is further absorbed by the waste heat recovery device 10. The waste heat exchanger 300 in the waste heat recovery device 10 transfers the heat in the flue gas to the cold water to achieve preheating. In this way, the cold water entering the main heat exchanger has been preheated, thereby improving the thermal efficiency of the entire gas water heater and reducing the heat discharged into the environment.

[0056] Regarding the installation position of the waste heat recovery device 10, the waste heat recovery device 10 is usually installed on the top of the gas water heater. Of course, in some embodiments, it can be installed on the side, or even outside the gas water heater, etc. The main thing is that the heat exchange channel of the waste heat exchanger 300 needs to be connected to the water system of the gas water heater.

[0057] Furthermore, the waste heat recovery device 10 further includes a deflector 200. The deflector 200 is disposed in the cavity 101. The deflector 200 divides the cavity 101 into a connected heat exchange cavity 101a and a deflector cavity 101b; the exhaust port 103 is communicated with the deflector cavity 101b, and the heat exchange cavity 101a is communicated with the combustion cavity of the gas water heater through the air inlet 102. In this way, in this embodiment, by setting the deflector 200, the flow direction and velocity distribution of the gas flow inside the heat exchanger can be changed, the contact time and area between the fluid and the heat exchange surface can be increased, the heat transfer is strengthened, and the heat recovery efficiency of the waste heat recovery device 10 is improved. Secondly, by guiding the gas flow through the deflector 200, it can be evenly distributed in the heat exchange cavity 101a, avoiding gas flow short circuit and local dead zones, thereby improving the heat exchange effect. Further, the setting of the deflector 200 can optimize the flow state of the fluid, reduce the eddy current and turbulence of the fluid, reduce the resistance of the fluid, and increase the stability and reliability of the system. In addition, by setting the deflector 200, the temperature non-uniformity of the fluid in the heat exchange cavity 101a can also be reduced, making the temperature distribution of the fluid more uniform during the heat exchange process.

[0058] Based on the previous embodiment, the deflector 200 includes a plate body 210 and a bending portion 220 connected by bending. The bending portion 220 is bent toward the side where the waste heat exchanger 300 is located. The plate body 210 and the bending portion 220 are usually integrally formed to ensure the sealing performance of the deflector 200, and the plate body 210 and the bending portion 220 are usually formed by stamping.

[0059] In this embodiment, by bending the bending portion 220 toward the side where the waste heat exchanger 300 is located, the bending portion 220 can change the flow path of the fluid, increase the contact time and contact area between the fluid and the heat exchange surface, thereby improving the heat transfer efficiency. Secondly, bending the bending portion 220 toward the side where the waste heat exchanger 300 is located can cause turbulence of the fluid. In the turbulent state, the fluid is more fully mixed, and the heat exchange efficiency is higher, which can effectively reduce the thermal resistance of the boundary layer. Bending the portion toward the side where the waste heat exchanger 300 is located can prevent the fluid from forming a short-circuit path when flowing through the waste heat exchanger 300, so that the gas flow can evenly pass through the entire waste heat exchanger 300, thereby achieving a more uniform temperature distribution and higher heat exchange performance. In addition, setting the deflector 200 in this way can also improve its rigidity and strength, making it more stable under high flow rate or high pressure conditions and not easily deformed.

[0060] Furthermore, the included angle between the plate body 210 and the bent portion 220 is not less than 90° and not greater than 110°. The included angle between the plate body 210 and the bent portion 220 refers to the included angle on the side facing the heat exchange cavity 101a. The values of the included angle between the plate body 210 and the bent portion 220 include, but are not limited to, 90°, 91°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, 109°, or 110°.

[0061] In one embodiment, please refer to Figure 3 , the middle part of the plate body 210 bulges towards the side of the heat exchange cavity 101a. With this arrangement, the distance between the plate body 210 and the waste heat exchanger 300 is not equal, which can further optimize the flow state of the fluid, increase the contact time and area between the fluid and the heat exchange surface, and further improve the recovery rate of the waste heat of the exhaust gas by the waste heat recovery device 10.

[0062] In one embodiment, the flow guide plate 200 further includes a connecting portion 230. The connecting portion 230 and the bent portion 220 are arranged on the same side of the plate body 210, and the connecting portion 230 is connected to the housing 100. Wherein, the connection between the connecting portion 230, the plate body 210, and the bent portion 220 adopts an arc transition, so as to reduce the eddy current and turbulence of the fluid and reduce the resistance of the fluid. The connecting portion 230 is usually welded to the housing 100.

[0063] With the technical solution of the present utility model, by arranging the flow guide plate 200, the flow direction and velocity distribution of the air flow inside the heat exchanger can be changed, the contact time and area between the fluid and the heat exchange surface can be increased, the heat transfer is strengthened, and the heat recovery efficiency of the waste heat recovery device 10 is improved. Secondly, by guiding the air flow through the flow guide plate 200, it can be evenly distributed in the heat exchange cavity 101a, avoiding air flow short - circuit and local dead zones, thereby improving the heat exchange effect. Furthermore, the arrangement of the flow guide plate 200 can optimize the flow state of the fluid, reduce the eddy current and turbulence of the fluid, reduce the resistance of the fluid, and increase the stability and reliability of the system. In addition, by arranging the flow guide plate 200, the temperature non - uniformity of the fluid in the heat exchange cavity 101a can also be reduced, making the temperature distribution of the fluid more uniform during the heat exchange process.

[0064] In one embodiment, the waste heat exchanger 300 has a water inlet 321b and a water outlet 322b that communicate with the heat exchange channels. The water outlet 322b is arranged closer to the air inlet 102 than the water inlet 321b. Thus, in this embodiment, by arranging the water outlet 322b closer to the air inlet 102 than the water inlet 321b, the low-temperature water can first exchange heat with the low-temperature air flow, and then the relatively high-temperature water exchanges heat with the relatively high-temperature air flow, thereby further improving the recovery rate of the waste heat of the waste gas by the waste heat recovery device 10.

[0065] In one embodiment, the waste heat exchanger 300 includes a heat exchange tube group 310 and a connection assembly 320. The connection assembly 320 includes a first connection member 321 provided at the water inlet end of the heat exchange tube group 310 and a second connection member 322 provided at the water outlet end of the heat exchange tube group 310. The first connection member 321 is provided with a water inlet cavity 321a and a water inlet 321b, and the water inlet cavity 321a communicates with the water inlet 321b. The second connection member 322 is provided with a water outlet cavity 322a and a water outlet 322b, and the water outlet cavity 322a communicates with the water outlet 322b. The heat exchange tube group 310 includes a plurality of tube bodies arranged side by side. The water inlet ends of the plurality of tube bodies are all communicated with the water inlet cavity 321a, and the water outlet ends of the plurality of tube bodies are all communicated with the water inlet cavity 321a.

[0066] Further, the connection assembly 320 includes a third connection member 323. The third connection member 323 is provided with a communication cavity 323a. The heat exchange tube group 310 includes a number of tube group segments 311. The tube group segments 311 are sequentially connected through the third connection member 323, and the plurality of tube bodies of each tube group segment 311 are all communicated with the communication cavity 323a to form a heat exchange channel.

[0067] Thus, through the arrangement of the connection assembly 320, at least one of the water inlet cavity 321a, the communication cavity 323a or the water outlet cavity 322a of the connection assembly 320 is simultaneously communicated with each tube body, so that the flow rates of the tubes in the heat exchange tube group 310 are basically the same. When the flow rates of the tube bodies are the same, the heat exchange process can be made more uniform, and the overall heat exchange efficiency of the heat exchanger will be improved. The uniform flow rate ensures the maximization of the temperature difference between the hot water and the cold water, thereby optimizing the heat energy recovery efficiency.

[0068] It can be understood that the first connection member 321, the second connection member 322 and the third connection member 323 are generally arranged in a box shape.

[0069] In a preferred embodiment, in order to reasonably arrange the tube groups and simplify the internal space of the waste heat recovery device 10, a number of tube group segments 311 are arranged side by side.

[0070] In one embodiment, at opposite ends of the tube group segment 311, the connection assemblies 320 located at the same end of the tube group segment 311 are integrally formed. For example, please refer to Figure 5, the first connector 321, the second connector 322, and the third connector 323 on the side where the water inlet and outlet 322b are located can all be integrally formed. In this way, the connection assembly 320 itself can directly cover the first installation port 104, thereby making the structure of the waste heat recovery device 10 more concise. Additionally, the integral formation of each connector eliminates the connection or welding points between the connectors, which are usually the weak links of stress concentration and potential failures. By reducing these connection points, the strength and durability of the overall structure are improved.

[0071] In one embodiment, there are gaps between multiple tube bodies, between multiple tube bodies and the housing 100, and between multiple tube bodies and the flow guide plate 200; in the cross-section intercepted perpendicular to the length direction of the tube group section 311, the cross-sectional area of the flow guide cavity 101b is not less than the sum of the cross-sectional areas of each gap. That is to say, the flow-through area of the heat exchange cavity 101a and the flow-through area of the flow guide cavity 101b are equal or approximately equal, so that the air flow resistance in the cavity 101 is balanced. The balanced air flow resistance in the cavity 101 can improve the stability, energy efficiency, and heat exchange efficiency of the waste heat recovery device 10, while reducing noise and vibration, and is also beneficial to the reliable operation and long-term stability of the waste heat recovery device 10. In other embodiments, the opening areas of the flow-through ports between the heat exchange cavity 101a and the flow guide cavity 101b, the opening area of the air inlet 102, and the opening area of the exhaust port 103 are equal or approximately equal.

[0072] In one embodiment, the housing 100 is further provided with a first installation port 104, the first installation port 104 communicates with the heat exchange cavity 101a, the heat exchange tube group 310 is installed into the heat exchange cavity 101a from the first installation port 104, and the connection assembly 320 covers the first installation port 104.

[0073] In one embodiment, the water inlet 321b and the water outlet 322b are arranged on the side of the housing 100 where the first installation port 104 is provided. In this embodiment, by arranging the water inlet 321b and the water outlet 322b on the side of the housing 100 where the first installation port 104 is provided, the external pipeline layout of the waste heat recovery device 10 can be simplified, the length and bending of the external pipeline can be reduced, the installation process can be simplified, and the maintenance cost can be reduced.

[0074] In one embodiment, the housing 100 includes a housing body 110 and an end plate 120. An air inlet 102, an air outlet 103, and a first mounting opening 104 are provided on the housing body 110. The housing body 110 is further provided with a second mounting opening 105. The first mounting opening 104 and the second mounting opening 105 are respectively provided on opposite sides of the housing body 110. The end plate 120 covers the second mounting opening 105. With this arrangement in this embodiment, it is convenient for the assembly of the waste heat exchanger 300. Among them, the first mounting opening 104 and the second mounting opening 105 can be open, or of course they can also not be open. The first mounting opening 104 and the second mounting opening 105 being open can reduce the processing difficulty of the housing 100 and improve the assembly efficiency of the waste heat exchanger 300.

[0075] In a preferred embodiment, the end plate 120 is provided with a groove 121. By providing the groove 121 on the end plate 120, it can play a limiting role on the connecting assembly 320, so that the tube body of the heat exchange tube group 310 will not be easily deformed during its transportation process.

[0076] Furthermore, the groove 121 includes a first groove body 122 and an annular groove body 123 that are connected to each other. Further, in order to ensure that the thermal expansion of the tube body of the heat exchange tube group 310 does not affect the device sealing performance and the shape of the water pipe, the gap between the waste heat exchanger 300 and the first groove body 122 is not greater than 0.5 mm and not less than 1.0 mm. Usually, the gap between the third connecting member 323 and the first groove body 122 is not greater than 0.5 mm and not less than 1.0 mm. Among them, the value of this gap includes but is not limited to 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm. For the specific position of this gap, please refer to Figure 6 H1.

[0077] Preferably, in order to improve the limiting effect of the groove 121 on the connecting assembly 320, the gap between the waste heat exchanger 300 and the annular groove body 123 is not greater than 0.3 mm and not less than 0.6 mm. The value of this gap includes but is not limited to 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm. For the specific position of this gap, please refer to Figure 6 H2.

[0078] In one embodiment, please refer to Figure 1 , the air inlet 102 is strip-shaped and extends along the length direction of the housing body 110. Preferably, the shape of the air inlet 102 is wide strip-shaped.

[0079] Thus, in this embodiment, by setting the air inlet 102 as a strip shape, the contact area with the heat source can be increased, thereby increasing the heat exchange surface area and improving the waste heat recovery efficiency. Secondly, the strip-shaped air inlet 102 design can reduce the resistance when the gas flows, reducing the energy consumption of the system. Compared with air inlets 102 of other shapes, the strip-shaped design allows the gas to flow more smoothly, reducing energy loss. The strip-shaped air inlet 102 helps to distribute the air flow more evenly, avoiding local overheating or overcooling of the air flow, and ensuring the stable operation of the waste heat recovery device 10. The strip-shaped air inlet 102 can disperse the air flow, reduce the speed of the gas, which is beneficial to reducing the pressure loss when the gas flows and improving the energy utilization efficiency.

[0080] In one embodiment, the shell body 110 includes a bottom plate 111 and two side plates 112. The bottom plate 111 is connected to the two side plates 112 respectively. The bottom plate 111 is inclined from its connection with one side plate 112 to the connection with the other side plate 112. A drain port 104 is provided at the lower side of the bottom plate 111, and the drain port 104 is communicated with the heat exchange cavity 101a. That is to say, the bottom plate 111 of the waste heat recovery device 10 is inclined downward.

[0081] Among them, the shell body 110 generally includes a bottom plate 111, two side plates 112 and a top plate 113. The bottom plate 111 and the top plate 113 are respectively arranged at the upper and lower ends of the waste heat recovery device 10. The bottom plate 111 and the top plate 113 are also respectively connected to the two side plates 112, thus enclosing a cylindrical structure. In this embodiment, in the direction of the bottom plate 111 towards the top plate 113, the lengths of the two side plates 112 are not equal.

[0082] In this embodiment, the bottom plate 111 is inclined downward. In some scenarios, the installation space can be better utilized, making the internal space of the gas water heater more compact and practical. Secondly, the downward inclination of the bottom plate 111 helps to optimize the air flow path, reduce the air flow resistance, and improve the heat exchange efficiency. Moreover, in this embodiment, the drain port 104 is provided at the lower side of the bottom plate 111, usually at the lowest position. In this way, the downward inclination of the bottom plate 111 can also help the condensate or other liquids generated in the waste heat recovery device 10 to drain smoothly, avoiding liquid accumulation, and thus preventing internal corrosion of the equipment.

[0083] Furthermore, the length direction of the heat exchange tube group 310 is arranged parallel to the bottom plate 111. And / or the plate body 210 of the flow guide plate 200 is arranged parallel to the bottom plate 111. In this way, the length direction of the heat exchange tube group 310 and the plate body 210 of the flow guide plate 200 are arranged parallel to the bottom plate 111, which can make the waste heat recovery device 10 more compact. Compared with the non-parallel scheme, it has the advantages of reducing the overall volume and weight of the equipment.

[0084] In one embodiment, the bottom plate 111, the two side plates 112 and the flow guide plate 200 enclose to form a heat exchange cavity 101a, and the top plate 113, the two side plates 112 and the flow guide plate 200 enclose to form a flow guide cavity 101b. The middle part of the bottom plate 111 bulges towards the side of the heat exchange cavity 101a.

[0085] In one embodiment, the inclination angle of the bottom plate 111 is not less than 5° and not more than 10°. Specifically, the values of the inclination angle of the bottom plate 111 include but are not limited to 5°, 6°, 7°, 8°, 9° or 10°. The inclination angle of the bottom plate 111 being not less than 5° and not more than 10° can enable the gas water heater to make better use of the installation space, optimize the air flow path, reduce the air flow resistance, and improve the heat exchange efficiency, while not making the overall size of the waste heat recovery device 10 too large.

[0086] The present utility model also proposes a gas water heater, which includes a water heater main body and a waste heat recovery device 10. The specific structure of the waste heat recovery device 10 refers to the above embodiments. Since this gas water heater adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0087] Among them, the water heater main body generally includes a housing 100, a burner, a main heat exchanger, an ignition device, an electric control box, a control valve assembly, an expansion tank, etc. The burner, the main heat exchanger, the ignition device, the electric control box, the control valve assembly and the expansion tank are usually arranged inside the housing 100. The burner is one of the core components of the gas water heater, responsible for mixing and burning gas and air to generate heat; the main heat exchanger is used to transfer the heat generated by the burner to the water flowing through it; the ignition device is used to ignite the gas in the burner, which can be electric spark ignition or thermocouple ignition; the electric control box is used to manage and control various electronic and electrical functions. The electric control box usually contains multiple circuit boards, sensor interfaces, control software and other electronic components, and is responsible for coordinating various operations of the gas water heater.

[0088] In one embodiment, the waste heat recovery device 10 is arranged at the top of the water heater main body. The waste heat recovery device 10 includes a housing 100, a flow guide plate 200 and a waste heat exchanger 300. The housing 100 is provided with a cavity 101, an air inlet 102 and an exhaust port 103; the flow guide plate 200 is arranged in the cavity 101, and the flow guide plate 200 divides the cavity 101 into a communicating heat exchange cavity 101a and a flow guide cavity 101b; the exhaust port 103 is communicated with the flow guide cavity 101b, and the heat exchange cavity 101a is communicated with the combustion cavity of the gas water heater through the air inlet 102; the waste heat exchanger 300 is arranged in the heat exchange cavity 101a, and the waste heat exchanger 300 is provided with a heat exchange channel for exchanging heat with the heat exchange cavity 101a.

[0089] Among them, a gas water heater generally includes a water heater main body, and the water heater main body generally includes a housing 100, a burner, a main heat exchanger, an ignition device, an electric control box, a control valve assembly, an expansion tank, etc., and the burner, the main heat exchanger, the ignition device, the electric control box, the control valve assembly and the expansion tank are generally arranged inside the housing 100. The burner is one of the core components of the gas water heater, responsible for mixing and burning gas and air to generate heat; the main heat exchanger is used to transfer the heat generated by the burner to the water flowing through it; the ignition device is used to ignite the gas in the burner, which can be electric spark ignition or thermocouple ignition; the electric control box is used to manage and control various electronic and electrical functions. The electric control box generally includes multiple circuit boards, sensor interfaces, control software and other electronic components, and is responsible for coordinating various operations of the gas water heater.

[0090] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A waste heat recovery device, applied to a gas water heater, characterized in that: include: A shell body, provided with a cavity, an air inlet and an air outlet; A guide plate is provided in the cavity, and the guide plate divides the cavity into a heat exchange cavity and a guide cavity which are connected; The exhaust port is in communication with the flow guide cavity, and the air inlet is in communication with the heat exchange cavity; and A waste heat exchanger is arranged in the heat exchange cavity, and the waste heat exchanger is provided with a heat exchange channel for exchanging heat with the heat exchange cavity.

2. The waste heat recovery device according to claim 1, characterized in that: The guide plate includes a plate body and a bent portion connected in a bent manner, and the bent portion is bent toward the side where the waste heat exchanger is located.

3. The waste heat recovery device according to claim 2, characterized in that: The angle between the plate body and the bent portion is not less than 90° and not more than 110°.

4. The waste heat recovery device according to claim 2, characterized in that: The middle part of the plate body is raised toward one side of the heat exchange cavity.

5. The waste heat recovery device according to claim 2, characterized in that: The guide plate further comprises a connecting portion, wherein the connecting portion and the bending portion are arranged on the same side of the plate body; and the connecting portion is connected to the shell.

6. The waste heat recovery device according to any one of claims 1 to 5, characterized in that: The waste heat exchanger has a water inlet and a water outlet communicated with the heat exchange channel, and the water outlet is arranged close to the air inlet relative to the water inlet.

7. The waste heat recovery device according to claim 6, characterized in that: The waste heat exchanger comprises a heat exchange tube group and a connecting assembly, wherein the connecting assembly comprises a first connecting piece arranged at the water inlet end of the heat exchange tube group and a second connecting piece arranged at the water outlet end of the heat exchange tube group; The first connecting member is provided with a water inlet cavity and the water inlet, the water inlet cavity and the water inlet are communicated with each other, and the second connecting member is provided with a water outlet cavity and the water outlet, the water outlet cavity and the water outlet are communicated with each other; The heat exchange tube group includes a plurality of tube bodies arranged side by side, the water inlet ends of the plurality of tube bodies are all connected to the water inlet cavity, and the water outlet ends of the plurality of tube bodies are all connected to the water inlet cavity.

8. The waste heat recovery device according to claim 7, characterized in that: The connection assembly comprises a third connection member, and the third connection member is provided with a communication cavity; The heat exchange tube group includes a plurality of tube group segments, each of which is connected in sequence through the third connecting piece, and a plurality of tube bodies of each tube group segment are connected with the connecting cavity to form the heat exchange channel.

9. The waste heat recovery device according to claim 8, characterized in that: A plurality of the tube group sections are arranged side by side.

10. The waste heat recovery device according to claim 9, characterized in that: The pipe segment has two oppositely disposed ends, and a connecting assembly located at the same end of the pipe segment is integrally formed.

11. The waste heat recovery device according to claim 9, characterized in that: There are gaps between the plurality of tubes, there are gaps between the plurality of tubes and the shell, and there are gaps between the plurality of tubes and the guide plate; In a cross section perpendicular to the length direction of the tube group segment, the cross-sectional area of ​​the flow guide cavity is not less than the sum of the cross-sectional areas of the gaps.

12. The waste heat recovery device according to claim 7, characterized in that: The shell is further provided with a first mounting port, the first mounting port is communicated with the heat exchange cavity, the heat exchange tube group is installed into the heat exchange cavity from the first mounting port, and the connecting assembly is sealed at the first mounting port.

13. The waste heat recovery device according to claim 12, characterized in that: The water inlet and the water outlet are arranged on a side of the shell where the first installation port is arranged.

14. The waste heat recovery device according to claim 13, characterized in that: The shell includes a shell body and an end plate; the air inlet, the exhaust port and the first mounting port are arranged on the shell body, and the shell body is also provided with a second mounting port, the first mounting port and the second mounting port are respectively arranged on opposite sides of the shell body, and the end plate covers the second mounting port.

15. The waste heat recovery device according to claim 14, characterized in that: The end plate is provided with a groove, and the groove includes a first groove body and an annular groove body connected to each other; The gap between the waste heat exchanger and the first tank body is not greater than 0.5 mm and not less than 1.0 mm; and / or the gap between the waste heat exchanger and the annular tank body is not greater than 0.3 mm and not less than 0.6 mm.

16. The waste heat recovery device according to claim 14, characterized in that: The air inlet is arranged in a strip shape and is extended along the length direction of the shell body.

17. The waste heat recovery device according to claim 14, characterized in that: The shell body comprises a bottom plate and two side plates, the bottom plate is respectively connected to the two side plates, and the bottom plate is inclined from a connection point between the bottom plate and one side plate to a connection point between the bottom plate and the other side plate.

18. The waste heat recovery device according to claim 17, characterized in that: The length direction of the heat exchange tube group is arranged parallel to the bottom plate; And or, the plate body of the guide plate is arranged parallel to the bottom plate.

19. The waste heat recovery device according to claim 17, characterized in that: The inclination angle of the bottom plate is not less than 5° and not more than 10°.

20. A gas water heater, characterized in that: It comprises a waste heat recovery device as described in any one of claims 1 to 19.

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