Combustion heat exchange assembly and gas combustion device having the same

Abstract

The application discloses a combustion heat exchange assembly and a gas combustion equipment with the same. The combustion heat exchange assembly comprises a heat exchanger, a burner holding structure arranged inside the heat exchanger, and a burner located inside the heat exchanger and held by the burner holding structure. According to the combustion heat exchange assembly, the burner holding structure is arranged to realize correct positioning of the burner in the heat exchanger, and prevent the burner from shaking in the heat exchanger to cause damage of the burner itself or the heat exchanger. In addition, the burner is embedded in the heat exchanger, the connecting fasteners between the burner and the heat exchanger are cancelled, the structure of the combustion heat exchange assembly is more compact, and the weight of the combustion heat exchange assembly is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, in particular to a combustion heat exchange assembly and a gas combustion device with the same. BACKGROUND

[0002] In order to reduce the emission of CO and NOx in the combustion tail gas of a gas water heater, the existing water heater manufacturers generally place a catalytic module (i.e., a burner) in the flue gas passage, i.e., a heat exchanger, to achieve this purpose. However, the existing heat exchanger is enclosed on all sides, which is not convenient for installing the catalytic module in the cavity of the heat exchanger. Therefore, some manufacturers place the catalytic module between the primary heat exchanger and the secondary heat exchanger which are separated from each other. The catalytic module is then fixed between the primary heat exchanger and the secondary heat exchanger through connecting fasteners. This will increase the weight of the gas water heater and complicate the overall structure. In addition, the catalytic module is difficult to work in the most suitable working temperature range, which will result in a large amount of harmful gases such as CO and NOx in the combustion tail gas. SUMMARY

[0003] The present application aims to at least partially solve one of the above technical problems in the prior art. To this end, the present application proposes a combustion heat exchange assembly, in which a burner is integrated inside a heat exchanger.

[0004] The present application also proposes a gas combustion device with the above combustion heat exchange assembly.

[0005] The combustion heat exchange assembly according to an embodiment of the present application comprises: a heat exchanger; a burner holding structure arranged inside the heat exchanger; and a burner located inside the heat exchanger and held by the burner holding structure.

[0006] The combustion heat exchange assembly according to an embodiment of the present application, by arranging the burner holding structure, can realize the correct positioning of the burner inside the heat exchanger, preventing the burner from shaking inside the heat exchanger and causing damage to the burner itself or the heat exchanger. In addition, the burner is embedded inside the heat exchanger, which eliminates the connecting fasteners between the burner and the heat exchanger, making the structure of the combustion heat exchange assembly more compact and facilitating the reduction of the weight of the combustion heat exchange assembly.

[0007] According to some embodiments of the present application, the burner holding structure is arranged on both sides of the burner, respectively.

[0008] Further, the burner holding structure on each side clamps the burner.

[0009] According to some embodiments of the present application, the burner holding structure comprises a clamping groove, in which a part of the burner is fitted.

[0010] Further, the clamping groove and the burner form a clamping fit on at least two sides.

[0011] In particular, the burner holding structure comprises an upper wall, a lower wall and a connecting wall connected between the outer sides of the upper wall and the lower wall, the upper wall, the connecting wall and the lower wall enclose a clamping groove which is open towards the burner, and the clamping groove and the burner form a clamping fit on three sides.

[0012] According to some embodiments of the present application, the burner holding structure is a pair of "U" shaped structures which are spaced apart and open towards each other.

[0013] According to some embodiments of the present application, a buffer structure is arranged between the burner holding structure and the burner.

[0014] According to some embodiments of the present application, the heat exchanger comprises a four surrounding plate and a heat exchange part arranged in the four surrounding plate, and the burner holding structure is fixed on two opposite inner wall surfaces of the four surrounding plate.

[0015] According to some embodiments of the present application, the burner holding structure is a pair of "L" shaped structures and comprises a first limb and a second limb, two first limbs are opposite to each other, the second limb is connected to the bottom of the first limb and two second limbs support the burner.

[0016] According to some embodiments of the present application, the burner holding structure is at least two groups of heat exchange parts, each group of heat exchange parts comprises two heat exchange pipes which clamp the burner from top to bottom.

[0017] According to some embodiments of the present application, the burner holding structure has a channel therein, and the channel communicates with a heat exchange medium channel in the heat exchanger.

[0018] According to some embodiments of the present application, the heat exchanger is provided with at least one row of heat exchange pipes above the burner, the heat exchange pipes are arranged opposite to the burner, and the heat exchange pipes are provided with heat exchange fins.

[0019] According to some embodiments of the present application, the heat exchanger is provided with at least one row of heat exchange pipes on the side wall surrounding plate below the burner.

[0020] Optionally, the heat exchanger is made of stainless steel.

[0021] Optionally, the burner is a catalytic burner, and a preheating burner is arranged inside the heat exchanger and opposite to the catalytic burner.

[0022] Further, at least one row of heat exchange pipes is arranged on the side wall of the heat exchanger and opposite to the position of the side plate of the preheating burner.

[0023] According to another aspect of the present application, the gas combustion equipment comprises the combustion heat exchange assembly, and the gas combustion equipment is a gas water heater or a wall-mounted boiler. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a perspective assembly view of the combustion heat exchange assembly;

[0025] Figure 2 is a perspective cutaway view of the combustion heat exchange assembly;

[0026] Figure 3 is a sectional view of the combustion heat exchange assembly;

[0027] Figure 4 is an exploded view of the combustion heat exchange assembly;

[0028] Figure 5 is an embodiment view of the burner holding structure as a heat exchange pipe.

[0029] LIST OF REFERENCE NUMBERS:

[0030] Combustion heat exchange assembly 10, heat exchanger 1, heat exchanger flange 1110, heat exchange fins 112, front plate 1130, rear plate 1140, left plate 1150, right plate 1160, right plate via 1161, left inner plate 1170, right inner plate 1180, right inner plate via 1181, observation window 122, heat exchange hole 13, heat exchange bump 14, burner 2, heat exchange part 3, support heat exchange part 31, top limiting heat exchange part 321, side limiting heat exchange part 322, upper heat exchange part 331, lower heat exchange part 332, water inlet 36, water outlet 37, four surrounding plates 38, burner holding structure 5, upper wall 51, connecting wall 52, lower wall 53, clamping groove 54, premixing cavity 6, air inlet 6111, gas inlet 6112, outer flange 614, air distribution plate 6230, preheating burner 7, mounting bracket 8, mounting hole 81. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0034] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The following will be described in detail Figures 1-4 The combustion heat exchange assembly 10 according to the embodiment of the present application is described in detail.

[0036] Referring to Figure 1 As shown, the combustion heat exchange assembly 10 according to the embodiment of the present application comprises a heat exchanger 1, a burner holding structure 5, a burner 2 and a preheating burner 7, the heat exchanger 1 has a heat exchange part 3 inside, the burner 2 is arranged inside the heat exchanger 1, and at least a part of the heat exchange part 3 (i.e. the upper heat exchange part 331 mentioned below) is located above the burner 2.

[0037] The preheating burner 7 can be arranged inside the heat exchanger 1, and the preheating burner 7 is arranged opposite to the burner 2, for example, in the example shown in Figure 3 In some embodiments not shown, the preheating burner 7 can be located above or beside the burner 2, as long as the burner 2 is located on the downstream side of the preheating burner 7 in the flow direction of the gas flow. Of course, the preheating burner 7 can also be arranged outside the heat exchanger 1.

[0038] For the convenience of description, the preheating burner 7 is located below the burner 2 as an example for illustration, but should not be regarded as a limitation on the relative position relationship between the preheating burner 7 and the burner 2. When the combustion heat exchange assembly 10 works, the heat radiated by the preheating burner 7 reaches the burner 2 upward, and the burner 2 is heated to make the temperature of the burner 2 rise to a suitable working temperature range, in which the burner 2 can exert the best catalytic combustion effect, and when the air-gas mixture is combusted in the burner 2, the combustion is sufficient, and the amount of harmful gases such as CO and NOx generated due to insufficient combustion is greatly reduced.

[0039] The heat exchanger 1 can be made of stainless steel or copper, and has good heat exchange effect and strong corrosion resistance.

[0040] The preheating burner 7 is a open flame burner, and the preheating burner 7 is optionally a honeycomb ceramic burner, and the burner 2 is a catalytic burner, and the burner 2 is optionally a foam ceramic burner coated with a catalyst.

[0041] Optionally, in order to avoid the backfire phenomenon of the preheating burner 7, a set distance is provided between the preheating burner 7 and the burner 2, and the set distance is used for preventing the backfire of the flame of the open flame combustion.

[0042] The burner retaining structure 5 is arranged in the interior of the heat exchanger 1, and the burner retaining structure 5 is used for retaining the burner 2 to correctly position the burner 2 in the interior of the heat exchanger 1, and prevent the burner 2 from shaking in the interior of the heat exchanger 1 to cause the damage of the burner 2 itself or the collision of the burner 2 with the heat exchanger 1.

[0043] According to the combustion heat exchange assembly of the embodiment of the present application, by arranging the burner retaining structure 5, the correct positioning of the burner 2 in the heat exchanger 1 can be realized, and the damage of the burner 2 itself or the collision of the burner 2 with the heat exchanger 1 caused by the shaking of the burner 2 in the interior of the heat exchanger 1 can be prevented. In addition, the burner 2 is embedded in the interior of the heat exchanger 1, the connecting fasteners between the burner 2 and the heat exchanger 1 are cancelled, the structure of the combustion heat exchange assembly 10 is more compact, and the weight of the combustion heat exchange assembly 10 is reduced.

[0044] Further, the burner retaining structure 5 is arranged at two sides of the burner 2 respectively, and after the assembly is completed, the position of the burner retaining structure 5 in the heat exchanger 1 is fixed, and thus the positioning of the burner 2 by the burner retaining structure 5 is more reliable.

[0045] Specifically, the burner retaining structure 5 comprises a clamping groove 54, and a part of the burner 2 is fitted in the clamping groove 54, and the clamping groove 54 can exert a clamping force on the burner 2 to prevent the burner 2 from shaking.

[0046] Furthermore, the clamping groove 54 and the burner 2 form a clamping engagement on at least two sides to ensure a better clamping effect.

[0047] Specifically, in such Figure 3 In the illustrated embodiment, the burner retaining structure 5 may include: an upper wall 51, a lower wall 53, and a connecting wall 52 connecting the outer sides of the upper wall 51 and the lower wall 53. The upper wall 51, the connecting wall 52, and the lower wall 53 together form a clamping groove 54 with an opening facing the burner 2. The clamping groove 54 and the burner 2 form a clamping engagement on three sides. The upper wall 51, the connecting wall 52, and the lower wall 53 form a "U"-shaped structure.

[0048] Optionally, the burner holding structure 5 is a pair of spaced-apart "U"-shaped structures with openings facing each other. The burner 2 is clamped between the clamping grooves 54 of the two burner holding structures 5, making it more secure.

[0049] In some optional embodiments, a buffer structure (not shown in the figure) is provided between the burner holding structure 5 and the burner 2. The buffer structure can be a sponge, which plays a buffering and protective role to prevent the burner holding structure 5 from being too strong and causing damage to the burner 2.

[0050] In some embodiments not shown, the burner retaining structure 5 is a pair of "L"-shaped structures including a first limb and a second limb. The two first limbs are opposite each other, and the second limbs are connected to the bottom of the first limbs and support the burner 2. The first limbs are equivalent to... Figure 3 The connecting wall 52 in the middle, the second limb is equivalent to Figure 3 53 on the lower wall of the middle section.

[0051] The burner retaining structure 5 consists of at least two sets of heat exchange sections 3, each set of heat exchange sections 3 including two heat exchange tubes that clamp the burner 2 from above and below. Figure 5 In the illustrated embodiment, the heat exchange section 3 includes a supporting heat exchange section 31 located at the lower part of the burner 2 and a top limiting heat exchange section 321 located at the top of the burner 2, and also includes a side limiting heat exchange section 322 located on the side of the burner 2. The supporting heat exchange section 31, the top limiting heat exchange section 321, and the side limiting heat exchange section 322 can fix the burner 2 without the need for additional connecting parts, which helps to reduce the number of parts and reduce the total weight of the combustion heat exchange assembly 10.

[0052] The burner retaining structure 5 has a channel that connects to the heat exchange medium channel within the heat exchange section 3. The internal channel of the burner retaining structure 5 is filled with water, which can be used to cool the burner 2. The water can flow within the channel and the heat exchange medium channel, and after being heated by the burner 2, the water is discharged from the outlet 37 of the combustion heat exchange assembly 10 for user use.

[0053] Furthermore, referring toFigure 1 As shown, the heat exchanger 1 has a water inlet 36 and a water outlet 37, the channel in the burner holding structure 5 is closer to the water inlet 36 than to the water outlet 37. In other words, the water outlet 37 is above the water inlet 36, and the distance between the channel in the burner holding structure 5 and the water inlet 36 is less than the distance between the channel in the burner holding structure 5 and the water outlet 37. Since the cold water with lower temperature enters the heat exchanger 1 from the water inlet 36 and becomes hot water with higher temperature after being heated and flows out from the water outlet 37, the channel in the burner holding structure 5 is close to the water inlet 36, so that the water in the channel of the burner holding structure 5 can be kept at a lower temperature, and thus the burner holding structure 5 can cool the burner 2.

[0054] The burner holding structure 5 is arranged at the side of the burner 2, and most of the energy radiated by the burner 2 passes through the heat exchanger 1 upwards, only a small part of the energy is radiated to the side of the burner holding structure 5, so the water temperature in the channel of the burner holding structure 5 is obviously lower than the water temperature in the heat exchange part 3.

[0055] Specifically, during the combustion stage of the burner 2, the temperature of the burner 2 will become higher and higher, so that the temperature of the burner 2 exceeds the optimum working temperature range. At this time, since the water temperature in the channel of the burner holding structure 5 is lower than the temperature of the burner 2, the burner holding structure 5 can cool the burner 2 under the action of heat transfer, so that the burner 2 returns to the optimum working temperature range and reduces the generation of harmful gases.

[0056] When the user does not need hot water, the burner 2 temporarily stops working, and the burner holding structure 5 continues to cool the burner 2, effectively reducing the internal temperature of the burner 2, so that the heat storage during water stop is reduced, which can effectively control the temperature rise during water stop, that is, it can avoid the continuous heating of the water in the heat exchange part 3 by the high-temperature residual heat of the burner 2 during the water stop stage, which leads to the continuous rise of the water temperature at the water outlet 37, and also can avoid the continuous overheating of the burner 2 which affects the service life of the burner 2.

[0057] The heat exchanger 1 comprises: a four surrounding plate 38 and a heat exchange part 3 arranged in the four surrounding plate 38, and the burner holding structure 5 is fixed on two opposite inner wall surfaces of the four surrounding plate 38.

[0058] Specifically, referring to Figures 1-2 , Figure 4As shown, the heat exchange portion 3 comprises: an upper heat exchange portion 331 located at the inner top of the four surrounding plates 38, and a lower heat exchange portion 332 located at the inner bottom of the four surrounding plates 38. The burner 2 is located at the middle region of the four surrounding plates 38, and the preheating burner 7 is located at the bottom of the four surrounding plates 38. The upper heat exchange portion 331 is arranged at the upper portion of the burner holding structure 5, and the lower heat exchange portion 332 is arranged at the lower portion of the burner holding structure 5. The lower heat exchange portion 332 is connected to the water inlet 36, and the upper heat exchange portion 331 is connected to the water outlet 37. Water from the water source enters the lower heat exchange portion 332 from the water inlet 36, flows through the lower heat exchange portion 332 and then enters the upper heat exchange portion 331, and finally flows out from the water outlet 37. The passage in the burner holding structure 5 communicates the lower heat exchange portion 332 and the upper heat exchange portion 331.

[0059] Further, at least a portion of the upper heat exchange portion 331 is located directly above the burner holding structure 5 and the burner 2, and the lower heat exchange portion 332 is divided into two groups spaced apart, and the two groups of lower heat exchange portions 332 are located directly below the two burner holding structures 5, respectively.

[0060] The water entering the heat exchanger 1 from the water inlet 36 flows through the lower heat exchange portion 332, the burner holding structure 5 and the upper heat exchange portion 331 in sequence, and finally flows out from the water outlet 37. The number of turns of the water flowing through the lower heat exchange portion 332 is less than the number of turns of the water flowing through the upper heat exchange portion 331. Therefore, the residence time of the water in the upper heat exchange portion 331 can be increased, so that the burner 2 can heat the water in the upper heat exchange portion 331 sufficiently, and the water temperature can reach the required temperature of the user quickly.

[0061] Optionally, the lower heat exchange portion 332 is sparser than the upper heat exchange portion 331. In other words, the number of the upper heat exchange portion 331 is greater than the number of the lower heat exchange portion 332. Therefore, the heating efficiency of the water temperature can be further improved, so as to shorten the heating time when the water temperature reaches the target value, and improve the user satisfaction.

[0062] The cross-sectional area of the burner holding structure 5 is greater than the cross-sectional area of any one heat exchange portion 3. Therefore, the contact area between the burner holding structure 5 and the burner 2 can be increased, so as to improve the clamping reliability of the burner holding structure 5 to the burner 2. At the same time, the water flow in the burner holding structure 5 can be ensured to be large, so that more excess combustion heat of the burner 2 can be taken away when the water flows through the burner holding structure 5, and the cooling effect of the burner holding structure 5 on the burner 2 can be improved.

[0063] Referring to Figure 2 , Figure 4As shown, the four peripheral plates 38 of the heat exchanger 1 include a front plate 1130, a rear plate 1140, a left plate 1150, a right plate 1160, a left inner plate 1170 disposed between the left plate 1150 and the right plate 1160, and a right inner plate 1180 disposed between the left inner plate 1170 and the right plate 1160, and the heat exchange part 33 is disposed between the left inner plate 1170 and the right inner plate 1180. The left inner plate 1170 and the right inner plate 1180 are provided with heat exchange holes 13, and the surface of the left plate 1150 facing the left inner plate 1170 and the surface of the right plate 1160 facing the right inner plate 1180 are provided with heat exchange convexes 14 corresponding to the heat exchange holes 13. The water entering the heat exchanger 1 from the water inlet 36 first enters the heat exchange convexes 14, and then enters the heat exchange holes 13 from the heat exchange convexes 14, and then enters the heat exchange part 33 corresponding to the heat exchange holes 13. The heat exchange fins 112 are arranged on the upper heat exchange part 331, thereby increasing the heat exchange area of the upper heat exchange part 331, thereby improving the heat exchange efficiency.

[0064] The front plate 1130, the rear plate 1140, the left plate 1150, and the right plate 1160 can be fixedly connected by bolt fasteners. When the burner 22 needs to be disassembled, the front plate 1130 or the rear plate 1140 is only needed to be disassembled, and then the burner 22 can be disassembled from the side, which is convenient to operate.

[0065] The lower part of the front plate 1130 and the rear plate 1140 is provided with a heat exchanger flange 1110, and the heat exchanger flange 1110 is fixed with the outer flange 614 of the premixing cavity 6 by fasteners to complete the assembly of the heat exchanger 1 and the premixing cavity 6.

[0066] The premixing cavity 6 has an air inlet 6111 and a gas inlet 6112. The air enters the cavity 61 through the air inlet 6111, and the gas enters the cavity 61 through the gas inlet 6112. The air inlet 6111 and the gas inlet 6112 are separated, so that the air and gas intake can be adjusted independently, which is conducive to adjusting the ratio of air and gas to meet the combustion demand. The air inlet 6111 is located on the bottom surface of the premixing cavity 6, the gas inlet 6112 is located on the side outer wall of the premixing cavity 6, and the air inlet 6111 and the gas inlet 6112 are perpendicular. Thus, the impact force of the air entering the cavity 61 from the air inlet 6111 and the gas entering the cavity 61 from the gas inlet 6112 is large at the inlet part 611, and the air and gas collide to accelerate the mixing of the air and gas.

[0067] The premixing cavity 6 can realize the premixing of air and gas, and the premixing cavity 6 is provided with an air distribution plate 6230, which can mix the air and gas again, thereby improving the uniformity of the air and gas mixture, and further improving the combustible performance of the air and gas mixture, so that the air and gas mixture can be fully combusted in the combustion stage.

[0068] The air inlet 6111 and the gas inlet 6112 are arranged below the air distribution plate 6230, and the air outlet side of the premixing chamber 6 is arranged above the air distribution plate 6230, and the mixed air and gas mixture flows out from the air outlet side, and then sequentially passes through the preheating burner 7 and the burner 2.

[0069] The front plate 1130 is further provided with an observation window 122, which facilitates observation of the combustion of the burner 2 inside the heat exchanger 1.

[0070] The front plate 1130 and the rear plate 1140 are provided with accommodating grooves on the surfaces opposite to each other, and the burner holding structure 5 is arranged in the accommodating grooves of the front plate 1130 and the rear plate 1140, so as to realize positioning of the burner holding structure 5 in the heat exchanger 1.

[0071] As shown in Figure 1 , Figure 4 , the water inlet 36 and the water outlet 37 are arranged on the right plate 1160, and the water of the water source enters the corresponding heat exchange bump 14 on the right plate 1160 through the water inlet 36, and then flows into the heat exchange medium channel of one of the lower heat exchange parts 332 from the heat exchange hole 13 opposite to the heat exchange bump 14, and then continues to flow to the left into the corresponding heat exchange bump 14 on the left plate 1150, and then flows into the heat exchange medium channel of the other lower heat exchange part 332 from the heat exchange bump 14, and after flowing through all the lower heat exchange parts 332, then enters the corresponding heat exchange bump 14 of the upper heat exchange part 331, and finally flows out from the water outlet 37 on the right plate 1160 after flowing through all the upper heat exchange parts 331.

[0072] Of course, the water inlet 36 and the water outlet 37 can be arranged on any different plates of the four surrounding plates 38, for example, in some embodiments not shown, the water outlet 37 can also be arranged on the left plate 1150.

[0073] Further, referring to Figure 1 , Figure 4 , the combustion heat exchange assembly 10 further comprises a mounting bracket 8, which is arranged on the four surrounding plates 38 and corresponds to the position of the end of the burner 2, and the mounting bracket 8 is provided with a mounting hole 81.

[0074] Further, the mounting hole 81 is used for mounting a thermocouple or a photoresistor. The right plate via hole 1161 is arranged on the right plate 1160, and the right inner plate via hole 1181 is arranged on the right inner plate 1180, and the right plate via hole 1161, the right inner plate via hole 1181 and the mounting hole 81 are aligned, so that when the thermocouple or the photoresistor is mounted in the mounting hole 81, the thermocouple or the photoresistor can be inserted close to the position of the burner 2 through the right plate via hole 1161 and the right inner plate via hole 1181, so as to more accurately monitor the temperature of the burner 2.

[0075] The heat exchanger 1 is provided with at least one row of heat exchange pipes (for example, the upper heat exchange part 331 in Figure 2 The heat exchange pipes are directly opposite the burner 2, and the radiant heat of the burner 2 directly reaches the heat exchange pipes. The heat exchange pipes are provided with heat exchange fins 112, which are beneficial to increasing the heat exchange area and improving the heat exchange efficiency.

[0076] The heat exchanger 1 is provided with at least one row of heat exchange pipes (for example, the lower heat exchange part 332 in Figure 2

[0077] Optionally, the burner is a catalytic burner, and a preheating burner is arranged opposite the catalytic burner inside the heat exchanger.

[0078] Further, at least one row of heat exchange pipes is arranged on the side wall of the heat exchanger 1 opposite the side plate of the preheating burner 7, and the preheating burner 7 can perform primary heat exchange on cold water entering the heat exchange pipes.

[0079] That is, the heat exchange pipes of the heat exchanger 1 extend from above the preheating burner 7 to above the catalytic burner 2. The heat exchange pipes below the catalytic burner 2 are used to exchange heat generated by the preheating burner to the waterway.

[0080] Since the catalytic combustion radiates heat outward, that is, heat is also generated at the bottom of the catalytic burner 2, the heat exchanger 1 in the present application actually surrounds the catalytic burner 2.

[0081] According to another aspect of the present application, the gas combustion device comprises the combustion heat exchange assembly 10 of the above-mentioned embodiments, and the gas combustion device is optionally a gas water heater or a wall-mounted boiler.

[0082] In the description of the present application, the description of the terms “one embodiment”, “some embodiments”, “an example”, “a specific example” or “some examples” means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above-mentioned terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0083] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.​

Claims

1. A combustion heat exchange assembly, characterized by, The heat exchanger comprises: a heat exchanger; a burner holding structure arranged inside the heat exchanger; a burner located inside the heat exchanger and held by the burner holding structure; the burner holding structure has a passage therein, which is communicated with a heat exchange medium passage in the heat exchanger; the burner holding structure comprises a clamping groove, in which a part of the burner is fitted; the clamping groove and the burner form a clamping fit on at least two sides; the burner holding structure comprises an upper wall, a lower wall, and a connecting wall connected between the outer sides of the upper wall and the lower wall, the upper wall, the connecting wall, and the lower wall enclose a clamping groove with an opening facing the burner, and the clamping groove and the burner form a clamping fit on three sides; the burner holding structure is a pair of "U"-shaped structures that are spaced apart and have openings facing each other.

2. The combustion heat exchange assembly of claim 1, wherein, The burner holding structure is arranged on both sides of the burner, respectively.

3. The combustion heat exchange assembly of claim 2, wherein, The burner holding structure on each side clamps the burner.

4. The combustion heat exchange assembly of claim 1, wherein, A buffer structure is arranged between the burner holding structure and the burner.

5. The combustion heat exchange assembly of claim 1, wherein, The heat exchanger comprises a peripheral plate and a heat exchange portion arranged in the peripheral plate, and the burner holding structure is fixed to two opposite inner wall surfaces of the peripheral plate.

6. The combustion heat exchange assembly of claim 1, wherein, The burner holding structure is a pair of "L"-shaped structures and comprises a first limb and a second limb, two first limbs are opposite to each other, the second limb is connected to the bottom of the first limb, and two second limbs support the burner.

7. The combustion heat exchange assembly of claim 1, wherein, The burner holding structure is at least two groups of heat exchange portions, each group of heat exchange portions comprises two heat exchange tubes that clamp the burner from top to bottom.

8. The combustion heat exchange assembly of claim 1, wherein, The heat exchanger is provided with at least one row of heat exchange tubes above the burner, the heat exchange tubes are arranged opposite to the burner, and the heat exchange tubes are provided with heat exchange fins.

9. The combustion heat exchange assembly of claim 1 or 8, wherein, The heat exchanger is provided with at least one row of heat exchange tubes on the side wall surrounding plate below the burner.

10. The combustion heat exchange assembly of claim 1, wherein, The heat exchanger is made of stainless steel.

11. The combustion heat exchange assembly of claim 1, wherein, The burner is a catalytic burner, and a preheating burner is arranged opposite to the catalytic burner inside the heat exchanger.

12. The combustion heat exchange assembly of claim 11, wherein, At least one row of heat exchange tubes is arranged on the side plate of the heat exchanger opposite to the position of the preheating burner.

13. A gas combustion apparatus, characterized by, The gas combustion device is a gas water heater or a wall-mounted boiler.

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