Condensing heat exchanger and hot water / heating apparatus thereof

Abstract

The application discloses a condensing heat exchanger and hot water / heating equipment thereof, and belongs to the technical field of heat exchangers. The condensing heat exchanger comprises a shell, wherein the shell comprises a first end portion, a second end portion opposite to the first end portion, and a side wall arranged between the first end portion and the second end portion, the second end portion is provided with a mounting portion for mounting a burner; an exhaust port is arranged on the shell; a heat exchange assembly is arranged inside the shell; a first heat insulation member is arranged close to the first end portion; a first gap is arranged between the first heat insulation member and the first end portion, and flue gas after heat exchange with the heat exchange assembly can flow through the first gap and be discharged from the exhaust port. The condensing heat exchanger and hot water / heating equipment thereof provided by the application can improve the reliability of the condensing heat exchanger and hot water / heating equipment thereof and reduce the cost under the premise of ensuring the heat insulation and cooling effect by optimizing the structure inside the condensing heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water heating, in particular to a condensing heat exchanger and a hot water / heating device. BACKGROUND

[0002] At present, gas combustion devices have been widely applied as a typical hot water equipment. Specifically, the gas combustion devices are divided into various forms, among which, the condensing gas water heater has great energy-saving potential as an efficient gas combustion device. Compared with the ordinary gas combustion device, the condensing gas water heater is provided with a condensing heat exchanger, which can fully absorb the heat of high-temperature flue gas to improve the heat exchange efficiency of the whole machine.

[0003] However, the current condensing heat exchanger still needs to be further optimized in structure, so as to comprehensively improve the reliability of the condensing heat exchanger and reduce the cost under the premise of ensuring the basic function (such as heat insulation and cooling effect). SUMMARY

[0004] In view of the above problems, one object of the present application is to provide a condensing heat exchanger and a hot water / heating device, which can improve the reliability of the condensing heat exchanger and the hot water / heating device and reduce the cost by optimizing the structure inside the condensing heat exchanger under the premise of ensuring the heat insulation and cooling effect.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] A condensing heat exchanger comprises a shell, the shell comprising an opposite first end portion, a second end portion, and a side wall provided between the first end portion and the second end portion, the second end portion being provided with a mounting portion for mounting a burner; an exhaust port provided on the shell; a heat exchange assembly provided inside the shell; a first heat insulation member provided close to the first end portion; a first gap provided between the first heat insulation member and the first end portion, at least part of flue gas after heat exchange with the heat exchange assembly being able to flow through the first gap and be discharged from the exhaust port.

[0007] In a preferred embodiment, a second gap is provided between the heat exchange assembly and the side wall, and the second gap is in communication with the first gap.

[0008] Further, at least part of the flue gas after heat exchange with the heat exchange assembly can flow through the second gap and the first gap in sequence and be discharged from the exhaust port.

[0009] In a preferred embodiment, the heat insulation member is provided with a third flow guide member close to the first end portion, and the third flow guide member and the first end portion form the first gap.

[0010] Further, a first flow guide is arranged between the outer side of the heat exchange assembly and the side wall of the shell, and a second gap is formed between the first flow guide and the inner side wall of the shell, and the first flow guide is sealingly connected with the third flow guide.

[0011] In a preferred embodiment, the heat exchange assembly is a double-layer heat exchange pipe, which comprises an inner-layer heat exchange pipe and an outer-layer heat exchange pipe arranged outside the inner-layer heat exchange pipe.

[0012] In a preferred embodiment, a second flow guide is arranged between the inner-layer heat exchange pipe and the outer-layer heat exchange pipe.

[0013] In a preferred embodiment, the first gap is larger than the second gap.

[0014] In a preferred embodiment, a third gap is formed between the inner wall of the first flow guide and the outer surface of the outer-layer heat exchange pipe, and a fourth gap is formed between the inner wall of the second flow guide and the outer surface of the inner-layer heat exchange pipe, and the fourth gap, the third gap, the second gap and the first gap can be sequentially communicated.

[0015] In a preferred embodiment, the material of the first heat insulation member comprises any one of the following: vermiculite, firebrick, quartz, glass fiber.

[0016] In a preferred embodiment, the condensation heat exchanger further comprises a second heat insulation member arranged close to the second end portion.

[0017] In a preferred embodiment, the second heat insulation member comprises a water-cooled light pipe arranged between the heat exchange assembly and the second end portion.

[0018] In a preferred embodiment, the second heat insulation member further comprises any one or a combination of the following: vermiculite, air cavity, cooling liquid cavity arranged between the water-cooled light pipe and the second end portion.

[0019] In a preferred embodiment, a drainage groove is arranged on the side wall of the shell, and a drainage opening is arranged at the lowest point of the drainage groove.

[0020] In a preferred embodiment, the side wall and the first end portion form a first sleeve with one end open, the first flow guide and the third flow guide form a second sleeve with one end open, the opening directions of the first sleeve and the second sleeve are the same, the first sleeve is arranged outside the second sleeve, and a connecting portion is arranged between the first sleeve and the second sleeve.

[0021] In a preferred embodiment, the first heat insulating member has opposite first and second surfaces along the thickness direction, the first surface is configured to be spaced apart from the burner by a predetermined distance, and the second surface is configured to be attached to the third flow guide.

[0022] In a preferred embodiment, the connecting portion further comprises an extension portion extending away from the first end portion, and the first heat insulating member is mounted on the extension portion.

[0023] In a preferred embodiment, the heat exchanging assembly is in the form of a heat exchanging coil, and a combustion chamber for mounting the burner is formed in the middle of the heat exchanging coil, and at least part of the first heat insulating member is located in the combustion chamber.

[0024] In a preferred embodiment, the first heat insulating member is in clearance fit with the heat exchanging assembly.

[0025] In a preferred embodiment, the first heat insulating member is in the form of a plunger, and the outer contour shape of the first heat insulating member matches the inner contour shape of the heat exchanging assembly.

[0026] In a preferred embodiment, a blocking member is further arranged between the top of the heat insulating member and the heat exchanging assembly along the height direction.

[0027] In a preferred embodiment, the heat exchanging pipe of the heat exchanging assembly is in the form of a finned tube.

[0028] In a preferred embodiment, the heat exchanging assembly comprises a layer of heat exchanging coil, and the cross section of the heat exchanging coil is in the form of D.

[0029] In a preferred embodiment, the heat exchanging assembly comprises a layer of heat exchanging coil, and the heat exchanging coil is in the form of a finned tube.

[0030] A hot water / heating device, comprising: the condensation heat exchanger as claimed in any one of the above, and a burner, the burner and the condensation heat exchanger are fixed on a combustion door, and the combustion door is fixed in fit with the first end portion of the condensation heat exchanger through a sealing structure.

[0031] Advantages:

[0032] The condensing heat exchanger provided by the application is provided with a first gap between the first heat insulation member and the first end portion, and the flue gas after heat exchange with the heat exchange assembly can flow through the first gap and be discharged from the flue gas discharge port. Since the temperature of the high-temperature flue gas is significantly reduced after heat exchange with the heat exchange assembly, the flue gas after temperature reduction can, on one hand, cool and radiate the first heat insulation member and take away part of the heat of the first heat insulation member, and on the other hand, the flue gas to be discharged after temperature reduction can cooperate with the first heat insulation member to significantly cool and insulate the first end portion.

[0033] In addition, since the first gap is additionally provided, the heat insulation performance requirement of the first heat insulation member is reduced under the premise of achieving equivalent heat insulation and cooling effects. When the heat insulation performance requirement of the first heat insulation member is reduced, the shape and structure of the first heat insulation member can be simplified to a relatively regular outer contour, such as a regular circular shape along the axial direction, compared with the outer shape of the special-shaped heat insulation member (such as special-shaped vermiculite) originally sealed between the heat exchange assembly and the first end portion. Through the optimization of the above structure, not only can the first heat insulation member not be directly contacted with the condensed water flowing out of the heat exchange assembly, thereby improving the reliability, but also the material usage can be saved, the manufacturing difficulty can be reduced, and the cost can be reduced.

[0034] Specific embodiments of the application are described in detail below with reference to the following description and to the attached drawings, which show, by way of illustration, the principles of the application in its application. It is understood that the embodiments of the application are not limited in scope so as to encompass only the specific embodiments described.

[0035] Features described and / or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with or in place of features in the other embodiments.

[0036] It should be emphasized that the term “comprises / comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0038] Figure 1 is a structural schematic diagram of a condensing heat exchanger provided by an embodiment of the application;

[0039] Figure 2This is an exploded view of a condenser heat exchanger provided in one embodiment of the present invention;

[0040] Figure 3 This is a schematic cross-sectional view of a condenser heat exchanger after an explosion, according to one embodiment of the present invention.

[0041] Figure 4 yes Figure 1 A sectional view;

[0042] Figure 5 yes Figure 4 A schematic diagram of the flue gas flow inside a condenser heat exchanger;

[0043] Figure 6 This is a schematic diagram of a condenser heat exchanger structure provided in another embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of a condenser heat exchanger structure provided in another embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 110. Casing; 111. First end; 112. Second end; 113. Side wall; 114. Smoke outlet; 115. Mounting part; X, axial direction; 116. Drainage channel; 117. Drain outlet;

[0047] 120. Heat exchanger assembly; 121. Inner heat exchanger tube; 122. Outer heat exchanger tube;

[0048] 130. First thermal insulation component;

[0049] 140. Second thermal insulation component;

[0050] 141. Water-cooled optical tube;

[0051] 142. Air cavity;

[0052] 151. First gap;

[0053] 152. Second gap;

[0054] 153. The third gap;

[0055] 154. Fourth gap;

[0056] 161. First guide vane;

[0057] 162. Second flow guide;

[0058] 163. Third flow guide;

[0059] Y, the height direction;

[0060] 170. Connecting part;

[0061] 200, burner. DETAILED DESCRIPTION

[0062] In order to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0063] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be another element interposed. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be another element interposed. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0065] Generally, high-temperature-resistant heat insulation materials are used for heat preservation and insulation at the end of a condensing heat exchanger. For example, a special-shaped heat insulation piece is used to block between the entire heat exchange assembly and the end, so as to achieve the ideal heat preservation and insulation effect. The inventor finds that in the use process of the condensing gas water heater, the special-shaped heat insulation piece needs more materials, has a larger processing difficulty, and has a higher overall cost.

[0066] In addition, when the special-shaped heat insulation piece is some material (for example, vermiculite) that is easily failed when encountering water, the part of the special-shaped vermiculite that is attached to the heat exchange assembly directly contacts the condensed water. The structure of the special-shaped vermiculite is easily scattered and failed after contacting the condensed water, that is, the function of heat preservation and insulation is lost, thereby causing the reliability of the condensing heat exchanger to be low. Therefore, the present application provides a condensing heat exchanger and a hot water / heating equipment, which can improve the reliability of the condensing heat exchanger and the hot water / heating equipment by optimizing the structure inside the condensing heat exchanger under the premise of ensuring the heat insulation and cooling effect, and can also reduce the cost.

[0067] Please refer to Figures 1 to 7In an embodiment of the present application, a condensing heat exchanger is provided, which can include a housing 110 including a first end portion 111, a second end portion 112 opposite to the first end portion 111, and a side wall 113 disposed between the first end portion 111 and the second end portion 112, the second end portion 112 being provided with a mounting portion 115 for mounting a burner 200; an exhaust port 114 provided on the housing 110; a heat exchange assembly 120 provided inside the housing 110; a first heat insulation member 130 disposed close to the first end portion 111; a first gap 151 being provided between the first heat insulation member 130 and the first end portion 111, through which flue gas exchanged at least partially with the heat exchange assembly 120 can flow and be discharged from the exhaust port 114.

[0068] As shown in Figure 1 , Figure 2 and Figure 3 , the housing 110 is internally formed with a hollow cavity for accommodating the heat exchange assembly 120, the first heat insulation member 130, the burner 200, etc. Specifically, the housing 110 can be in the form of a hollow cylinder, and of course, the shape of the housing 110 can also be adaptively adjusted and designed according to the actual installation space, etc., which is not specifically limited herein. In the present specification, the housing 110 is mainly exemplified in the shape shown in the drawings. When the housing 110 is in other shape configurations, it can be analogously referred to the examples in the present specification, which will not be further described herein.

[0069] Specifically, the housing 110 can include a first end portion 111, a second end portion 112 opposite to the first end portion 111, and a side wall 113 disposed between the first end portion 111 and the second end portion 112. When the condensing heat exchanger is in an installed state, the first end portion 111 can be located close to a user (i.e., the first end portion 111 is a front end portion), and the second end portion 112 is located away from the user (i.e., the second end portion 112 is a rear end portion). The second end portion 112 is provided with a mounting portion 115 for mounting the burner 200. The mounting portion 115 can include an opening hole formed in the second end portion 112, and of course, the mounting portion 115 can also include a connecting structure (such as a quick-connection buckle) for matching and mounting the burner 200. Specifically, the form of the connecting structure is not specifically limited herein.

[0070] The shell 110 is further provided with a smoke outlet 114 for guiding the flue gas after heat exchange with the heat exchange assembly 120 out of the condensing heat exchanger. Specifically, the smoke outlet 114 can be arranged at the top of the side wall 113, thereby facilitating efficient discharge along the flow direction of the flue gas. Of course, the smoke outlet 114 can also be arranged at other positions, and the specific arrangement position of the smoke outlet 114 can be determined according to the specific arrangement of the flue gas flow channel inside the heat exchanger, which is not specifically limited herein.

[0071] In addition, the side wall 113 is further provided with a water outlet 117 for guiding the condensed water generated by the heat exchange assembly 120 out of the condensing heat exchanger. Specifically, the water outlet 117 can be arranged at the bottom of the side wall 113, thereby facilitating efficient and complete discharge of the condensed water out of the shell 110 under the action of gravity and preventing the condensed water from accumulating. Of course, in some embodiments, the water outlet 117 can also be arranged at other positions of the side wall 113.

[0072] In a specific embodiment, the side wall 113 of the shell 110 is provided with a drainage groove 116, and the lowest point of the drainage groove 116 is provided with a water outlet 117.

[0073] When the side wall 113 of the shell 110 is provided with a drainage groove 116, and the water outlet 117 is located at the lowest point of the drainage groove 116, it can be ensured that the condensed water can be smoothly discharged even if there is a certain installation error in the condensing heat exchanger, such as forward or backward inclination along the axis direction X of the condensing heat exchanger (or the shell 110). The axis direction X of the shell 110 can extend substantially along the horizontal plane. Of course, considering the limitations of actual installation error and installation environment, the axis can have a certain angle with the horizontal plane. The drainage groove 116 can extend substantially along the axis direction X of the shell 110.

[0074] In the present embodiment, the heat exchange assembly 120 is the main part of the condensing heat exchanger for heat exchange with high-temperature flue gas, which can specifically be in the form of a heat exchange coil. The middle part of the heat exchange coil is formed with a combustion chamber for mounting the burner 200, and at least part of the first heat insulation member 130 is located in the combustion chamber. As shown in Figure 4 In the axis direction X, the first heat insulation member 130 can be completely located in the combustion chamber formed by the heat exchange coil. For example, the first heat insulation member 130 has opposite first and second surfaces along the thickness direction, and the second surface of the first heat insulation member 130 can be flush or close to flush with the surface of the heat exchange assembly 120 perpendicular to the axis direction X, thereby reducing the size of the condensing heat exchanger in the axis direction X. Of course, in other embodiments, the first heat insulation member 130 can be partially located in the combustion chamber in the axis direction X.

[0075] According to the number of layers of the heat exchange assembly 120, the heat exchange coil can include a single layer of heat exchange pipe, or a double layer of heat exchange pipe, or more layers of heat exchange pipe. In addition, the heat exchange coil can include any one of the following forms or a combination thereof: a threaded pipe, a smooth pipe, a finned tube, a D-shaped heat exchange coil, etc. In the specific embodiments of the present application, the different embodiments described are mainly distinguished by the different number of layers and / or forms of the heat exchange assembly 120.

[0076] In the present embodiment, a first heat insulation member 130 is arranged near the first end portion 111.

[0077] Specifically, the first heat insulation member 130 can be in clearance fit with the heat exchange assembly 120. When the first heat insulation member 130 is in clearance fit with the heat exchange assembly 120, the condensed water generated on the heat exchange assembly 120 can be prevented from directly contacting the first heat insulation member 130.

[0078] Further, a blocking member is arranged between the top of the first heat insulation member 130 and the heat exchange assembly 120 along the height direction Y. Even if the condensed water flows downward under the action of gravity, it will only drip onto the blocking member and finally be discharged outward through the drain opening 117.

[0079] For the case where the heat exchange coil is a double-layer heat exchange pipe, the surface of the inner layer heat exchange pipe 121 is generally in a high temperature state, and the probability of generating condensed water is generally small. For the outer layer heat exchange pipe 122, there may be condensed water in some parts. Therefore, the blocking member can be arranged near the first end portion 111 to receive the condensed water that may drip from the outer layer heat exchange pipe 122.

[0080] Specifically, the first heat insulation member 130 can be in the form of a plunger, and the outer contour shape of the heat insulation member matches the inner contour shape of the heat exchange assembly 120. The first heat insulation member 130 can be made of a high-temperature-resistant material, for example, the material of the first heat insulation member 130 can include any one of the following or a combination thereof: vermiculite, refractory brick, quartz, glass fiber. In the following embodiments, the first heat insulation member 130 is mainly exemplified by taking vermiculite as an example.

[0081] In the embodiment, the first gap 151 is arranged between the first heat insulation member 130 and the first end portion 111, and the flue gas after heat exchange with the heat exchange assembly 120 can flow through the first gap 151 and be discharged from the flue gas outlet 114. Since the temperature of the high-temperature flue gas is significantly reduced after heat exchange with the heat exchange assembly 120, the flue gas after temperature reduction can cool and radiate the first heat insulation member 130 and take away part of the heat of the first heat insulation member 130 when flowing through the first gap 151, and on the other hand, the flue gas after temperature reduction can significantly cool and insulate the first end portion 111 in cooperation with the first heat insulation member 130.

[0082] In addition, since the first gap 151 is additionally arranged, the heat insulation performance requirement of the first heat insulation member 130 is reduced under the premise of achieving the same heat insulation and cooling effect. When the heat insulation performance requirement of the first heat insulation member 130 is reduced, the shape and structure of the first heat insulation member 130 can be simplified to a relatively regular outer contour, such as a regular circular shape along the axial direction, compared with the outer shape of the special-shaped heat insulation member (such as special-shaped vermiculite) originally sealed between the heat exchange assembly 120 and the first end portion 111. Through the optimization of the above structure, the first heat insulation member 130 can not only be directly contacted with the condensed water flowing out of the heat exchange assembly 120, thereby improving the reliability, but also can save the material amount and reduce the manufacturing difficulty, thereby reducing the cost.

[0083] In order to ensure that the flue gas flowing through the first gap 151 is the flue gas with low temperature after heat exchange with the heat exchange assembly 120, the third flow guide member 163 is arranged between the first heat insulation member 130 and the shell 110. Specifically, the third flow guide member 163 is arranged at the first heat insulation member 130 close to the first end portion 111, and the third flow guide member 163 and the first end portion 111 form the first gap 151. Specifically, the third flow guide member 163 and the inner wall of the first end portion 111 of the shell 110 form the first gap 151, and the end of the third flow guide member 163 close to the side wall 113 is provided with an air inlet for the flue gas flowing into the first gap 151. Whether the air inlet is arranged in the whole circumferential direction or is arranged in the partial area is not limited herein. The third flow guide member 163 can be fixedly arranged at one end of the first heat insulation member 130, and of course in other optional embodiments, the third flow guide member 163 can be arranged on the inner wall of the first end portion 111 of the shell 110 through a support, which is not limited herein.

[0084] In the embodiment, in order to further reduce the flue gas temperature flowing through the first gap 151, a first flow guide 161 is further arranged between the heat exchange assembly 120 and the shell 110, and the first flow guide 161 is sealingly connected with a third flow guide 163, so that the high-temperature flue gas cannot directly flow to the first gap 151 along the axial direction. The third flow guide 163 can be a plate with a certain thickness as a whole, and the outer contour shape of the third flow guide 163 can match the cross section of the first flow guide 161. Of course, the shape and structure of the third flow guide 163 can also be adaptively designed according to requirements, and the present application is not limited herein, and only one end of the first flow guide 161 close to the first end portion 111 is plugged. The third flow guide 163 can be a sheet metal part, and of course other high-temperature-resistant materials can also be selected. The sealing connection can be welding, or the third flow guide 163 can be integrally formed with the first flow guide 161, and of course the third flow guide 163 and the first flow guide 161 can also be sealingly connected by other means, which are not specifically limited herein. When the first gap 151 is formed by the third flow guide 163 and the first end portion 111, and the third flow guide 163 is sealingly connected with the first flow guide 161, the first heat insulation piece 130 only needs to be arranged in the high-temperature area opposite to the combustion chamber, which is beneficial to the reduction and regularity of the shape of the first heat insulation piece 130.

[0085] In addition, in other embodiments, the first gap 151 can also be formed by other means, for example, the first gap 151 can be directly formed by the first heat insulation piece 130 and the first end portion 111. When the first gap 151 is directly formed by the first heat insulation piece 130 and the first end portion 111, the periphery of the first heat insulation piece 130 can be arranged in close contact with the side wall 113 of the shell 110 or close to the close contact, or the inner side of the side wall 113 of the shell 110 is provided with a mounting structure for mounting the first heat insulation piece 130, and the mounting structure, the first heat insulation piece 130 and the first end portion 111 form the first gap 151.

[0086] In one embodiment, the heat exchange assembly 120 and the side wall 113 are provided with a second gap 152, and the second gap 152 is in communication with the first gap 151.

[0087] In the embodiment, a second gap 152 can be arranged between the heat exchange assembly 120 and the side wall 113 of the shell 110, and the second gap 152 is in communication with the first gap 151. In the flow direction of the flue gas, the second gap 152 can be upstream of the first gap 151, that is, after the high-temperature flue gas exchanges heat with the heat exchange assembly 120, at least part of the high-temperature flue gas can sequentially pass through the second gap 152, the first gap 151, and finally be discharged through the smoke outlet 114; or, in the flow direction of the flue gas, the second gap 152 can be downstream of the first gap 151, that is, after the high-temperature flue gas exchanges heat with the heat exchange assembly 120, at least part of the high-temperature flue gas can sequentially pass through the first gap 151, the second gap 152, and finally be discharged through the smoke outlet 114; or, the second gap 152 and the first gap 151 form two relatively independent flue gas flow channels, that is, after the high-temperature flue gas exchanges heat with the heat exchange assembly 120, part of the high-temperature flue gas can pass through the first gap 151 and be discharged through the smoke outlet 114, and part of the high-temperature flue gas can pass through the second gap 152 and be discharged through the smoke outlet 114. Or, in the flow direction of the flue gas, there is no relative upstream and downstream relationship between the first gap 151 and the second gap 152, and the flow of the flue gas as a whole is different according to the specific arrangement of the internal flow guide of the shell 110 and the smoke outlet 114. For example, at least part of the flue gas can first flow through the second gap 152, then flow through the first gap 151, and then flow through the second gap 152 again, and finally be discharged from the smoke outlet 114.

[0088] Specifically, for the case that at least part of the flue gas after exchanging heat with the heat exchange assembly 120 can sequentially flow through the second gap 152 and the first gap 151 and be discharged from the smoke outlet 114, after the high-temperature flue gas flowing out of the burner 200 exchanges heat with the heat exchange assembly 120, the flue gas can first flow through the second gap 152 for sufficient heat exchange and cooling, and then flow into the first gap 151 in communication with the second gap 152, so that the temperature of the flue gas entering the first gap 151 can be relatively low. When the flue gas with a lower temperature flows into the first gap 151, a significant heat dissipation and cooling effect can be produced on the first end portion 111.

[0089] In one embodiment, a first flow guide 161 is arranged between the outer side of the heat exchange assembly 120 and the side wall 113 of the shell 110, and the first flow guide 161 and the inner side wall 113 of the shell 110 form the second gap 152.

[0090] Specifically, the first flow guide member 161 can be sleeved on the periphery of the heat exchange assembly 120. The shape and structure of the first flow guide member 161 can match the outer contour of the heat exchange assembly 120. For example, when the outer contour of the heat exchange assembly 120 is in a cylindrical shape, the first flow guide member 161 can be in a hollow tubular structure. Of course, the shape and structure of the first flow guide member 161 are not limited to the above examples, and those skilled in the art can make adaptive adjustments according to actual design needs.

[0091] The first flow guide member 161 and the inner side wall 113 of the shell 110 are spaced apart by a second gap 152, which can be used for the flow of flue gas after heat exchange with the heat exchange assembly 120. Wherein, the first gap 151 is greater than the second gap 152. When the first gap 151 is greater than the second gap 152, the flow resistance of the fluid in the first gap 151 is less than that in the second gap 152, thereby facilitating the flue gas after heat exchange with the heat exchange assembly 120 flowing into the first gap 151, i.e. ensuring that there is enough flue gas flowing in the first gap 151, thereby achieving a more significant heat dissipation and cooling effect on the first end portion 111.

[0092] Wherein, it should be noted that the specific values of the first gap 151 and the second gap 152 can be different according to the different structures and sizes of the actual condensing heat exchanger, and the present application does not make specific limitations here. In other optional embodiments, the first gap 151 can also be less than or equal to the second gap 152. For the embodiment provided with both the second gap 152 and the first gap 151, when the first gap 151 is formed between the third flow guide member 163 and the first end portion 111, and the first flow guide member 161 is in sealing connection with the third flow guide member 163, it can ensure that the high-temperature flue gas is fully heat-exchanged with the heat exchange assembly 120 and then flows to the first gap 151 through the second gap 152, i.e. avoiding the high-temperature flue gas directly flowing into the first gap 151.

[0093] In one specific embodiment, the side wall 113 and the first end portion 111 form a first sleeve with one end open, the first flow guide member 161 and the third flow guide member 163 form a second sleeve with one end open, the first sleeve is sleeved outside the second sleeve, and the first sleeve and the second sleeve are provided with a connecting portion 170.

[0094] In the embodiment, the side wall 113 and the first end portion 111 can form a first sleeve with one end open. Specifically, the side wall 113 and the first end portion 111 can be integrally formed or can be sealingly connected by welding or the like. The first flow guide 161 and the third flow guide 163 can form a second sleeve with one end open, the opening directions of the first sleeve and the second sleeve are the same, and the first sleeve is sleeved outside the second sleeve. The first sleeve and the second sleeve can be provided with a connecting portion 170, which is used to position the second sleeve relative to the first sleeve. Specifically, the connecting portion 170 can be in the form of a stud. For example, one end of the stud provided with a nut can be fixed to the first end portion 111, and one end of the stud provided with a stud extends along the axial direction. The third flow guide 163 of the second sleeve is provided with a hole matching the stud. The specific form of the connecting portion 170 is not limited to the above example, and it can also be other feasible solutions. In addition, the number of the connecting portion 170 can be one or more, which is not specifically limited herein.

[0095] Further, the first heat insulation piece 130 has opposite first and second surfaces along the thickness direction, the first surface is used to be arranged at a predetermined distance from the burner 200, and the second surface is arranged in abutment with the third flow guide 163.

[0096] In the embodiment, the second surface of the first heat insulation piece 130 is arranged in abutment with the third flow guide 163, and the first surface is arranged at a predetermined distance from the burner 200. The predetermined distance can be determined according to the thickness dimensions of the burner 200, the heat exchange assembly 120, and the first heat insulation piece 130, and the specific value is not specifically limited herein.

[0097] In addition, the connecting portion 170 can further include an extension portion extending away from the first end portion 111, and the first heat insulation piece 130 is mounted on the extension portion.

[0098] In the embodiment, the connecting portion 170 is taken as an example in the form of a stud. When the connecting portion 170 is a stud, one end of the stud provided with a nut can be fixed to the first end portion 111, and one end of the stud provided with a stud can pass through the third flow guide 163 and extend out. The extension portion can be a stud segment extending out of the third flow guide 163. The first heat insulation piece 130 can be mounted on the stud. When the connecting portion 170 and the extension portion are in the form of a stud, the stud can be used to position the first sleeve, the second sleeve, and the first heat insulation piece 130, which is simple to install, compact in structure, and has little interference with the flue gas flow in the first gap 151 due to the relatively small size of the stud.

[0099] In one embodiment, the condensing heat exchanger can further comprise a second heat insulating member 140 disposed proximate to the second end portion 112.

[0100] In the present embodiment, a second heat insulating member 140 can be further disposed proximate to the second end portion 112 of the housing 110. Since the second end portion 112 is the end portion facing the user, it is necessary to reduce the temperature of the second end portion 112 to a safe temperature to prevent the user from being accidentally contacted. Specifically, the second heat insulating member 140 can be disposed between the heat exchange assembly 120 and the second end portion 112, and can include various forms. For example, the second heat insulating member 140 can include a water-cooled light pipe 141 disposed between the heat exchange assembly 120 and the second end portion 112. Circulating liquid (e.g., circulating water) flows through the water-cooled light pipe 141, and the circulating water can be in communication with the water in the heat exchange assembly 120, i.e., the water inlet and outlet of the water-cooled light pipe 141 are in communication with the heat exchange assembly 120. Of course, it is not excluded that the water in the water-cooled light pipe 141 is supplied through an independent system. The cooling water circulating in the water-cooled light pipe 141 can have a cooling effect on the second end portion 112.

[0101] Further, the second heat insulating member 140 can further include any one or a combination of vermiculite, an air cavity 142, and a cooling liquid cavity disposed between the water-cooled light pipe 141 and the second end portion 112.

[0102] In the present embodiment, the second heat insulating member 140 can be formed by the water-cooled light pipe 141 in cooperation with other heat insulating parts. For example, an air cavity 142 and a water-cooled light pipe 141 can be sequentially disposed between the second end portion 112 and the heat exchange assembly 120. The air cavity 142 is used for heat insulation, and the water-cooled light pipe 141 is used for water-cooled heat absorption, thereby achieving a heat insulation and cooling effect equivalent to that of vermiculite alone. When the second heat insulating member 140 is formed by the water-cooled light pipe 141 in cooperation with other heat insulating parts, a heat insulation and cooling effect equivalent to that of vermiculite alone can also be achieved.

[0103] For the case where the second heat insulating member 140 does not include vermiculite, not only a heat insulation and cooling effect equivalent to that of vermiculite alone can be achieved, but also the problem of poor reliability of vermiculite can be fundamentally solved. For the case where the second heat insulating member 140 includes not only the water-cooled light pipe 141 but also vermiculite, since the water-cooled light pipe 141 is provided, the heat insulation performance requirement of the vermiculite is reduced, the size of the vermiculite can be reduced, and the reliability of the vermiculite can be improved to some extent.

[0104] In the following embodiments, different forms of the heat exchange assembly 120 will be mainly taken as examples for respective description.

[0105] Please refer toFigures 3 to 4 In one embodiment, the heat exchange assembly 120 is a double-layer heat exchange pipe, which includes an inner-layer heat exchange pipe 121 and an outer-layer heat exchange pipe 122 arranged outside the inner-layer heat exchange pipe 121.

[0106] In the present embodiment, the heat exchange assembly 120 can be a double-layer heat exchange pipe, which includes an inner-layer heat exchange pipe 121 and an outer-layer heat exchange pipe 122. A second flow guide 162 is arranged between the inner-layer heat exchange pipe 121 and the outer-layer heat exchange pipe 122.

[0107] In the present embodiment, the heat exchange pipe in the heat exchange assembly 120 is mainly described in the form of a finned tube with high heat exchange efficiency, and other forms can be analogously referred to, which will not be described herein. When the heat exchange pipe is a finned tube, the inner-layer heat exchange pipe 121 is sleeved with a plurality of first fins, and the outer-layer heat exchange pipe 122 is sleeved with a plurality of second fins.

[0108] In the present embodiment, the second flow guide 162 is arranged between the inner-layer heat exchange pipe 121 and the outer-layer heat exchange pipe 122.

[0109] Specifically, the second flow guide 162 can be a hollow sleeve structure. One end of the second flow guide 162 is sealingly connected (for example, can be welded) to the second end portion 112, and the other end of the second flow guide 162 and the third flow guide 163 form a certain flow guide gap. The flow guide gap is used to form a communication part for guiding the condensed water generated by the second flow guide 162 to the first flow guide 161.

[0110] The first flow guide 161 is arranged between the outer-layer heat exchange pipe 122 and the side wall 113 of the shell 110. One end of the first flow guide 161 is sealingly connected (for example, can be welded) to the third flow guide 163, and the other end is in gap fit with the second end portion 112. The gap formed between the first flow guide 161 and the second end portion 112 is used to form a flue gas flow guide opening between the heat exchange assembly 120 and the first flow guide 161. The high-temperature flue gas flowing out of the burner 200 passes through the flue gas flow guide opening after heat exchange with the heat exchange assembly 120, and then enters the second gap 152. The flue gas subsequently entering the second gap 152 can at least partially flow into the first gap 151.

[0111] In the present embodiment, the inner layer heat exchange tube 121 can generate condensate drops in the process of heat exchange with flue gas, which can drop into the second flow guide 162. The condensate on the second flow guide 162 flows to the first flow guide 161 through the flow guide gap. Meanwhile, the condensate generated on the outer layer heat exchange tube 122 also flows into the first flow guide 161. The two parts of condensate flow through the first flow guide 161 and are finally discharged from the shell 110 through the drain 117.

[0112] In a specific embodiment, a third gap 153 is formed between the inner wall of the first flow guide 161 and the outer surface of the outer layer heat exchange tube 122, and a fourth gap 154 is formed between the inner wall of the second flow guide 162 and the outer surface of the inner layer heat exchange tube 121. The fourth gap 154, the third gap 153, the second gap 152 and the first gap 151 can be sequentially communicated.

[0113] In the present embodiment, a third gap 153 is formed between the inner wall of the first flow guide 161 and the outer surface of the outer layer heat exchange tube 122, which can be used for the circulation of flue gas and condensate. The specific value of the third gap 153 can be different according to the internal structure of the first flow guide 161, the outer contour shape of the outer layer heat exchange tube 122, etc., which is not specifically limited herein.

[0114] A fourth gap 154 is formed between the inner wall of the second flow guide 162 and the outer surface of the inner layer heat exchange tube 121, which is mainly used for the circulation of flue gas. The specific value of the fourth gap 154 can be different according to the internal structure of the second flow guide 162, the outer contour shape of the inner layer heat exchange tube 121, etc., which is not specifically limited herein.

[0115] Please refer to Figure 5The verification of the temperature change of the flue gas by using the condensing heat exchanger is as follows: in the flow direction of the flue gas, the fourth gap 154, the third gap 153, the second gap 152 and the first gap 151 can be sequentially communicated. Specifically, the high-temperature flue gas with a temperature of about 1100 degrees Celsius flowing out of the burner 200 diffuses to the surrounding, first contacts the inner heat exchange tube 121, and the temperature of the flue gas is reduced to about 250 degrees Celsius by one-time temperature reduction; the flue gas after one-time temperature reduction flows into the third gap 153 along the fourth gap 154, and exchanges heat with the outer heat exchange tube 122, so that the temperature of the flue gas is reduced to about 70-100 degrees Celsius by two-time temperature reduction; the flue gas after two-time temperature reduction flows into the second gap 152 along the third gap 153, and the temperature of the flue gas is reduced again during the flow in the second gap 152; the temperature of the flue gas flowing into the first gap 151 from the second gap 152 is about 55-90 degrees Celsius, and finally the flue gas flowing from the first gap 151 to the smoke outlet 114 can be reduced to 50-80 degrees Celsius. As can be seen, the condensing heat exchanger provided in the embodiment has high heat exchange efficiency, and can fully utilize the heat in the flue gas.

[0116] As shown in FIG. 1, Figure 6 In another embodiment, the heat exchange assembly 120 includes one layer of heat exchange coil, and the heat exchange coil is a finned tube.

[0117] In the embodiment, the heat exchange assembly 120 can include only one layer of heat exchange coil, and specifically, the heat exchange coil can be a finned tube. When the heat exchange coil is a finned tube, it is beneficial to guide the high-temperature flue gas to exchange heat with the heat exchange assembly 120 efficiently.

[0118] When the heat exchange assembly 120 includes only one layer of heat exchange coil, compared with the above-mentioned form with two layers of heat exchange coil, the main difference is that the part of the heat exchange assembly 120 cooperating with the internal structure of the heat exchange assembly 120 is different. For example, compared with the form provided with double heat exchange tubes, the second flow guide 162 is adaptively cancelled in the embodiment. The high-temperature flue gas flowing out of the burner 200 exchanges heat with the heat exchange assembly 120, and then flows into the second gap 152 and the first gap 151 in sequence, and finally is discharged from the smoke outlet 114.

[0119] As shown in FIG. 1, Figure 7 In still another embodiment, the heat exchange assembly 120 includes one layer of heat exchange coil, and the cross section of the heat exchange coil is D-shaped.

[0120] In the present embodiment, the heat exchange assembly 120 can only include one layer of heat exchange coil, and specifically, the cross section of the heat exchange coil can be D-shaped. When the heat exchange assembly 120 only includes one layer of heat exchange coil, the main difference relative to the form with two layers of heat exchange coil is that the part of the heat exchange assembly 120 cooperating with the internal structure of the heat exchange assembly 120 is different. Of course, the specific form of the heat exchange assembly 120 can also be other forms, as long as it is a form that can be applied to the condensing heat exchanger provided by the present application, it should be included in the scope of the claims of the present application.

[0121] Based on the same concept, one embodiment of the present application also provides a hot water / heating device, comprising: the condensing heat exchanger according to any one of the above embodiments. The burner 200 and the condensing heat exchanger are fixed on the combustion door, and the combustion door is fixed by cooperating with the sealing structure of the first end portion 111 of the condensing heat exchanger.

[0122] The hot water / heating device can be a gas hot water device, and more specifically, the hot water device can be a condensing water heater, a gas water heater, and a wall-mounted stove. Of course, the hot water device can also be a heating stove.

[0123] Any numerical value cited herein includes all values from the lower value to the upper value in increments of one unit, and there are at least two units of interval between any lower value and any higher value. For example, if it is stated that the value of a component quantity or process variable (such as temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to indicate that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also explicitly listed in the specification. For values less than 1, it is appropriate to consider that one unit is 0.0001, 0.001, 0.01, 0.1. These are just examples of what is intended to be explicitly stated in the specification, and all possible combinations of values listed between the lowest value and the highest value are considered to be explicitly stated in the specification in a similar manner.

[0124] Unless otherwise stated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" as applied to a range generally means that the range is intended to cover the two endpoints and all numbers between the endpoints. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0125] All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional in an embodiment of the present teachings to the extent that "comprising" or "including" is used. The use of the term "about" to describe any property, parameter or value is meant to convey that the exact value need not be used, but that the desired range is within 10% of the exact value.

[0126] Plural elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate plural elements, ingredients, components or steps. To the extent any of the above descriptions are presented in terms of methods, acts or steps, it should be understood that such methods, acts or steps can be performed in the order presented, or in any other order that is logically possible.

[0127] It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for all purposes. The omission of any aspect of the subject matter disclosed herein does not preclude coverage of that aspect of the subject matter in the claims.

Claims

1. A condensing heat exchanger, characterized in that, The condensing heat exchanger includes: The housing includes opposing first end and second end, and a sidewall disposed between the first end and the second end, wherein the second end is provided with a mounting portion for mounting a burner; The smoke exhaust port is located on the housing. A heat exchange component is disposed inside the housing, and a drain outlet is provided on the side wall for discharging the condensate generated by the heat exchange component into the condensing heat exchanger. A first heat insulation element is disposed near the first end; A first gap is provided between the first heat insulation member and the first end, and a third flow guide is provided near the first end of the heat insulation member, and the first gap is formed between the third flow guide and the first end. A first flow guide is provided between the outer side of the heat exchange component and the side wall of the shell, a second gap is formed between the first flow guide and the inner side wall of the shell, the first flow guide is sealed to the third flow guide, and the second gap communicates with the first gap; At least a portion of the flue gas that has exchanged heat with the heat exchange component can flow sequentially through the second gap and the first gap, and be discharged from the exhaust port.

2. The condensing heat exchanger as described in claim 1, characterized in that, The heat exchange assembly is a double-layer heat exchange tube, including: an inner heat exchange tube and an outer heat exchange tube disposed outside the inner heat exchange tube.

3. The condensing heat exchanger as described in claim 2, characterized in that, A second flow guide is provided between the inner heat exchange tube and the outer heat exchange tube.

4. The condensing heat exchanger as described in claim 1, characterized in that, The first gap is larger than the second gap.

5. The condensing heat exchanger as described in claim 3, characterized in that, A third gap is formed between the inner wall of the first flow guide and the outer surface of the outer heat exchange tube, and a fourth gap is formed between the inner wall of the second flow guide and the outer surface of the inner heat exchange tube. The fourth gap, the third gap, the second gap and the first gap can be connected in sequence.

6. The condensing heat exchanger as described in claim 1, characterized in that, The material of the first heat insulation component includes any one of the following: vermiculite, refractory brick, quartz, and glass fiber.

7. The condensing heat exchanger as described in claim 1, characterized in that, The condensing heat exchanger further includes a second heat insulation element, which is disposed near the second end.

8. The condensing heat exchanger as described in claim 7, characterized in that, The second heat insulation component includes a water-cooled light pipe disposed between the heat exchange assembly and the second end.

9. The condensing heat exchanger as described in claim 8, characterized in that, The second heat insulation component also includes any one or a combination of vermiculite, air cavity, and coolant cavity disposed between the water-cooled light tube and the second end.

10. The condensing heat exchanger as claimed in claim 1, characterized in that, A drainage channel is provided on the side wall of the shell, and a drain outlet is provided at the lowest point of the drainage channel.

11. The condensing heat exchanger as described in claim 3, characterized in that, The sidewall and the first end form a first sleeve with one end open, the first guide member and the third guide member form a second sleeve with one end open, the opening directions of the first sleeve and the second sleeve are the same, the first sleeve is sleeved outside the second sleeve, and a connecting part is provided between the first sleeve and the second sleeve.

12. The condensing heat exchanger as described in claim 11, characterized in that, The first heat insulation member has a first surface and a second surface opposite each other along the thickness direction. The first surface is set at a predetermined distance from the burner, and the second surface is fitted to the third flow guide member.

13. The condensing heat exchanger as described in claim 12, characterized in that, The connecting portion further includes an extension extending away from the first end, and the first heat insulation member is mounted on the extension.

14. The condensing heat exchanger as described in claim 1, characterized in that, The heat exchange assembly is in the form of a heat exchange coil, and a combustion chamber for mounting the burner is formed in the middle of the heat exchange coil, with at least a portion of the first heat insulation member located in the combustion chamber.

15. The condensing heat exchanger as described in claim 14, characterized in that, The first heat insulation component is fitted with the heat exchange assembly with a clearance.

16. The condensing heat exchanger as described in claim 15, characterized in that, The first heat insulation component is generally plunger-shaped, and the outer contour shape of the heat insulation component matches the inner contour shape of the heat exchange assembly.

17. The condensing heat exchanger as described in claim 15, characterized in that, Along the height direction, a blocking element is also provided between the top of the first heat insulation member and the heat exchange assembly.

18. The condensing heat exchanger as claimed in claim 1, characterized in that, The heat exchanger tubes of the heat exchange assembly are finned tubes.

19. The condensing heat exchanger as claimed in claim 1, characterized in that, The heat exchange assembly includes a heat exchange coil, and the heat exchange coil has a D-shaped cross-section.

20. The condensing heat exchanger as claimed in claim 1, characterized in that, The heat exchange assembly includes a heat exchange coil, which is a finned tube.

21. A hot water / heating device, characterized in that, include: The condensing heat exchanger and the burner as described in any one of claims 1 to 20, wherein the burner and the condensing heat exchanger are fixed on a combustion door, and the combustion door and the first end of the condensing heat exchanger are fixed together by a sealing structure.

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