Condensation heat exchange device and gas water heating equipment

Abstract

The utility model belongs to the technical field of gas water heating equipment, and discloses a condensation heat exchange device and gas water heating equipment. According to the condensation heat exchange device, the atomization head is limited to be gradually away from the central axis of the atomization shell in the direction from bottom to top, water mist can be continuously close to the circumferential inner wall of the atomization shell in the upward flowing process, and the situation that the atomization capacity of the atomization head is affected due to the fact that part of water mist generated by the atomization head is condensed into water drops in the mist forming process is avoided. L is limited to be larger than H * tan alpha, so that atomized water columns generated when the atomizer works at the standard water level cannot touch the inner wall of the atomizing shell, and the atomizing effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of gas-fired water heating equipment, and in particular to a condensing heat exchange device and a gas-fired water heating equipment. Background Technology

[0002] The working principle of a condensing gas water heater is to send the flue gas, which has been cooled by the main heat exchanger, into the condensing shell of the condensing heat exchange device. Before the cold water is sent into the main heat exchanger, it is first sent into the heat exchange pipe of the condensing heat exchange device so that the flue gas in the condensing shell can preheat the cold water.

[0003] During this process, water vapor in the flue gas is condensed into condensate, which continuously accumulates at the bottom of the condenser housing. One commonly used method for condensate treatment is to install an atomizing housing at the bottom of the condenser housing, with its lower part connected to the condenser housing. An atomizer is installed at the bottom of the atomizing housing, and an exhaust box is installed above the atomizing housing. The lower end of the exhaust box forms a flue gas inlet inside the condenser housing, while the upper end of the exhaust box is connected to the outside atmosphere. The atomizer atomizes the condensate in the atomizing housing into water mist, which enters the exhaust box through the flue gas inlet at the bottom and is then discharged into the outside atmosphere.

[0004] In actual use, it was found that the atomized water column produced by the atomizer may hit the inner wall of the atomizing housing, thus affecting the atomization effect. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a condensation heat exchange device that can improve the mist formation effect.

[0006] The second technical problem solved by this utility model is to provide a gas-fired hot water device that can improve the misting effect.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] Condensation heat exchange device, including:

[0009] The condenser housing is equipped with a first flue gas inlet;

[0010] The atomizing housing has a mist outlet at its top that communicates with the condenser housing, and a water inlet that communicates with the condenser housing and is located below the mist outlet.

[0011] An atomizer is disposed at the inner bottom of the atomizing housing. The atomizer includes an atomizing body and an atomizing head disposed at the top of the atomizing body. Along the direction from bottom to top, the atomizing head gradually moves away from the central axis of the atomizing housing, and the angle between the center line of the end face of the atomizing head and the central axis of the atomizing housing is α.

[0012] L > H×tanα, where L represents the minimum horizontal distance between the center of the end face of the atomizing head and the inner peripheral wall of the atomizing housing, and H represents the height difference between the center of the end face of the atomizing head and the top surface of the atomizing housing.

[0013] Compared with the background art, the condensation heat exchange device of the present utility model has the following beneficial effects:

[0014] In the condensation heat exchange device provided by the present utility model, by defining that along the direction from bottom to top, the atomizing head gradually moves away from the central axis of the atomizing housing, during the upward flow of the water mist, it will continuously approach the circumferential inner wall of the atomizing housing, avoiding the water mist generated by the atomizing head from affecting the atomizing ability of the atomizing head due to partial condensation into water droplets and falling during the atomizing process. By defining L > H×tanα, it can be ensured that the atomizing water column generated by the atomizer working at the standard water level will not touch the inner wall of the atomizing housing, thus ensuring the atomizing effect.

[0015] In one embodiment, 2° ≤ α ≤ 10°.

[0016] In one embodiment, L = k×H×tanα, where 3 ≤ k ≤ 7.

[0017] In one embodiment, the atomizing housing includes a housing body with an open top, and a diversion structure wound around the outer periphery of the open top of the housing body. The top opening of the diversion structure forms the mist outlet; the diversion structure is provided with a diversion surface, and along the direction from bottom to top, the diversion surface gradually approaches the central axis of the atomizing housing, and the included angle between the diversion surface and the central axis of the atomizing housing is β;

[0018] β = arctan((L - H1×tanα) / (H1 - H)), where L represents the minimum horizontal distance between the center of the end face of the atomizing head and the inner peripheral wall of the atomizing housing, and H1 represents the height difference between the atomizing explosion point of the atomizing water column generated by the atomizing head and the center of the end face of the atomizing head when the atomizer works at the standard water level.

[0019] In one embodiment, 20° ≤ β ≤ 60°.

[0020] In one embodiment, H1 = h1 + h2 + h3, where h1 represents the height difference between the top surface of the atomizer and the standard water level, h2 represents the height difference between the center of the end face of the atomizing head and the top surface of the atomizer, and h3 represents the height difference between the atomizing explosion point of the atomizing water column and the standard water level;

[0021] [[ID=​

[0022] In one embodiment, 30mm≤h4≤70mm, where h4 represents the height difference between the top surface of the atomizer and the highest permissible water level inside the atomizing housing.

[0023] In one embodiment, H = h2 + h5, where h5 represents the height difference between the top surface of the atomizing housing and the top surface of the atomizer, and 35mm ≤ h5 ≤ 90mm.

[0024] In one embodiment, h4 < h5 < 1.1h4.

[0025] In one embodiment, the condensation heat exchange device further includes a mist exhaust box, the upper end of which is in communication with the outside atmosphere, and the lower end of which forms a second flue gas inlet located inside the condensation shell. The second flue gas inlet and the mist outlet are arranged vertically opposite each other above the mist outlet.

[0026] The height difference between the upper end face of the flow guiding structure on the side closer to the first smoke inlet and the lower end face of the mist exhaust box is x1, and the height difference between the upper end face of the flow guiding structure on the side farther from the first smoke inlet and the lower end face of the mist exhaust box is x2, where x1 < x2 < 2x1.

[0027] In one embodiment, the lower end face of the mist box and the upper end face of the flow guide structure are vertically spaced to form an opening, and the width of the opening gradually increases in the vertical direction from the side of the opening near the first smoke inlet to the side of the opening away from the first smoke inlet.

[0028] The second technical problem mentioned above is solved by the following technical solution:

[0029] Gas-fired hot water equipment, including the condensing heat exchange device provided in any of the above embodiments.

[0030] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages:

[0031] The gas-fired water heater provided by this utility model employs the aforementioned condensation heat exchange device. By limiting the atomizing head to gradually move away from the central axis of the atomizing shell in an upward direction, the water mist continuously approaches the circumferential inner wall of the atomizing shell as it flows upward. This prevents the water mist generated by the atomizing head from partially condensing into droplets and falling back down during the atomization process, thus avoiding affecting the atomization capability of the atomizing head. By limiting L > H × tanα, the atomized water column generated by the atomizer at standard water levels will not touch the inner wall of the atomizing shell, thereby ensuring the atomization effect. Attached Figure Description

[0032] Figure 1This is a first cross-sectional view of the condensation heat exchange device provided in this embodiment of the present invention;

[0033] Figure 2 This is a second sectional view of the condensation heat exchange device provided in this embodiment of the present invention;

[0034] Figure 3 This is a simplified schematic diagram of the condensation heat exchange device provided in this embodiment of the utility model.

[0035] In the picture:

[0036] 1. Condenser housing; 11. First flue gas inlet;

[0037] 2. Atomizing shell; 21. Shell body; 22. Flow guiding structure; 221. Atom outlet; 222. Flow guiding surface;

[0038] 3. Exhaust box; 31. Second smoke inlet;

[0039] 4. Atomizer; 41. Atomizing body; 42. Atomizing head;

[0040] 5. Condensing heat exchange tubes;

[0041] 100. Opening. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] In the description of this application, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] An embodiment of this utility model provides a condensation heat exchange device and a gas-fired water heater, wherein the gas-fired water heater includes the aforementioned condensation heat exchange device to prevent condensate from impacting the inner wall of the demisting box and causing condensation and backflow, thereby improving the demisting effect.

[0047] like Figure 1 and Figure 2 As shown, the condensation heat exchange device includes a condenser shell 1, an atomizing shell 2, a mist exhaust box 3, and an atomizer 4. The condenser shell 1 has a first flue gas inlet 11. The top of the atomizing shell 2 has a mist outlet 221 communicating with the condenser shell 1, and the atomizing shell 2 has a water inlet communicating with the condenser shell 1 and located below the mist outlet 221. The upper end of the mist exhaust box 3 communicates with the outside atmosphere, and the lower end of the mist exhaust box 3 forms a second flue gas inlet 31 located inside the condenser shell 1. The second flue gas inlet 31 and the mist outlet 221 are arranged vertically opposite each other above the mist outlet 221. The atomizer 4 is located at the bottom inner part of the atomizing shell 2 and includes an atomizing body 41 and an atomizing head 42 located on top of the atomizing body 41.

[0048] High-temperature flue gas enters the condenser shell 1 through the first flue gas inlet 11. The condenser shell 1 is equipped with a condenser heat exchange tube 5. The cold water flowing in the condenser heat exchange tube 5 absorbs the heat energy in the hot flue gas in the condenser shell 1 and raises its temperature. After being cooled by the condenser heat exchange tube 5, part of the flue gas enters the mist exhaust box 3 through the second flue gas inlet 31.

[0049] During the heat exchange process between the hot flue gas and the cold water flowing in the condenser heat exchange tube 5, condensate will be formed. The condensate drips onto the bottom wall of the condenser shell 1 and enters the atomizing shell 2 through the water inlet. The atomizer 4 works, and the atomizing head 42 atomizes the condensate into water mist, which flows upward to the mist outlet 221. The hot flue gas entering between the second flue gas inlet 31 and the mist outlet 221 drives the hot flue gas near the mist outlet 221 to flow upward and enters the exhaust box 3 through the second flue gas inlet 31, and then is discharged to the outside atmosphere.

[0050] In this embodiment, the atomizing head 42 gradually moves away from the central axis of the atomizing housing 2 in an upward direction. This arrangement helps to prevent the water mist generated by the atomizing head 42 from partially condensing into water droplets and falling during the atomization process, thus affecting the atomization capability of the atomizing head 42.

[0051] In this embodiment, L > H × tanα, where L represents the minimum horizontal distance between the center of the end face of the atomizing head 42 and the inner peripheral wall of the atomizing shell 2, H represents the height difference between the center of the end face of the atomizing head 42 and the top surface of the atomizing shell 2, and the angle between the center line of the end face of the atomizing head 42 and the central axis of the atomizing shell 2 is α.

[0052] By limiting L > H × tanα, the atomized water column generated by the atomizer 4 at the standard water level will not touch the inner wall of the atomizing housing 2, thus ensuring the atomization effect.

[0053] In some embodiments, the atomizing housing 2 includes a housing body 21 with a top opening and a flow guiding structure 22 surrounding the outer periphery of the top opening of the housing body 21. The top opening of the flow guiding structure 22 forms a mist outlet 221, and the flow guiding structure 22 is provided on the outer periphery of the mist outlet 221. The flow guiding structure 22 has a flow guiding surface 222, which gradually approaches the central axis of the atomizing housing 2 in a bottom-to-top direction. Specifically, the outer peripheral wall of the flow guiding structure 22 forms the flow guiding surface 222.

[0054] When the atomizer 4 is working, the condensed water in the condenser housing 1 is atomized to form water mist. The water mist is discharged from the mist outlet 221 and flows upward. As the guide surface 222 gradually approaches the central axis of the atomizing housing 2 from bottom to top, the guide surface 222 guides the hot flue gas in the condenser housing 1 into the second flue gas inlet 31 in an oblique upward direction. This reduces the downward misting pressure formed by the hot flue gas between the second flue gas inlet 31 and the mist outlet 221 on the mist outlet 221, thus improving the misting effect. Moreover, the hot flue gas in the condenser housing 1 enters the second flue gas inlet 31 in an oblique upward direction, which is conducive to the hot flue gas carrying the water mist discharged from the mist outlet 221 into the mist exhaust box 3 and then into the outside atmosphere. This avoids the hot flue gas blowing the water mist flowing out of the mist outlet 221 horizontally, causing the hot flue gas to disperse the water mist from the root of the water mist, thus improving the mist exhaust effect.

[0055] In some embodiments, the angle between the guide surface 222 and the central axis of the atomizing housing 2 is β, β = arctan(L - H1 × tanα) / (H1 - H), where L represents the minimum horizontal distance between the center of the end face of the atomizing head 42 and the inner peripheral wall of the atomizing housing 2, and H1 represents the height difference between the atomization burst point of the atomized water column generated by the atomizing head 42 and the center of the end face of the atomizing head 42 when the atomizer 4 is working at the standard water level.

[0056] It should be noted that the center of the end face of the atomizing head 42 refers to the center of the top surface of the atomizing head 42. The centerline of the end face of the atomizing head 42 passes through the center of the top surface of the atomizing head 42 and is perpendicular to the top surface of the atomizing head 42. When the atomizer 4 is working under standard water level, the highest mist-forming position of the atomizer 4 can reach and maintain a preset maximum mist-forming height. The preset maximum mist-forming height is a known value determined according to actual needs.

[0057] When the atomizing head 42 operates at the standard water level, an atomized water column will form above the water surface inside the atomizing housing 2. The atomized water column bursts from the atomization burst point above its root to form water mist; that is, the water mist formed by atomization originates above the atomized water column. (See reference...) Figure 3 The water column above the water surface is the atomized water column. Figure 3 The horizontal dashed line in the figure represents the height of the atomization burst point; the atomization burst point of the atomized water column can be directly measured through experiments. Typically, the distance between the atomization burst point of the atomized water column and the center of the end face of the atomizing head 42 ranges from 40 to 110 mm.

[0058] When a gas-fired water heater is operating, the water level inside the atomizing housing 2 may not always remain at the standard level; it may be higher or lower. The energy generated by the high-frequency vibration of the atomizer 4 during operation needs to overcome the potential energy of the atomized water column itself, causing the condensed water to burst at the atomization point of the water column to form water mist. If the water level inside the atomizing housing 2 is too high, the greater the height difference between the top surface of the atomizer 4 and the water level inside the atomizing housing 2, the higher the energy required for water mist formation. This may result in the inability to break the surface tension of the atomized water column, thus preventing the formation of water mist. Therefore, the water level inside the atomizing housing 2 must not exceed the maximum permissible water level within the atomizing housing 2. The maximum permissible water level inside the atomizing housing 2 can be determined through repeated experiments.

[0059] When β is too small, the downward atomizing pressure formed by the flue gas flow is large, which inhibits water mist formation and upward flow. When β is too large, the flue gas flow will directly blow onto the atomized water column, which will damage the stability of the atomized water column and thus affect water mist generation. By limiting β = arctan(L - H1 × tanα) / (H1 - H), the guide surface 222 can guide the flue gas flow in the condensation shell 1 to enter the area above the mist outlet 221 at an angle upward, minimizing the downward inhibitory effect of the flue gas flowing above the guide structure 22 on the water mist. This helps to guide the flue gas flow to a region slightly below the atomization burst point of the atomized water column. (Refer to...) Figure 3 The arrow indicates the flue gas flow. The water mist generated above the atomization explosion point of the atomized water column forms a flow force with the flue gas flow, guiding the atomized water mist to rise upwards, ensuring that the atomized water mist can be successfully formed into mist and carried out of the atomization shell 2 by the flue gas.

[0060] In some embodiments, at least two atomizing heads 42 are provided, and the at least two atomizing heads 42 are arranged at circumferential intervals along the atomizing body 41. Exemplarily, two atomizing heads 42 are provided.

[0061] By setting at least two atomizing heads 42, the atomization requirements can be met; and along the direction from bottom to top, the atomizing heads 42 gradually move away from the central axis of the atomizing shell 2, so that the water mist generated by different atomizing heads 42 moves away from each other as it flows upward, thereby reducing the collision of water mist generated by different atomizing heads 42 and causing the water mist to condense.

[0062] In some embodiments, 20°≤β≤60°. When β is less than 20°, the downward atomizing pressure exerted by the flue gas flow on the water mist exiting the mist outlet 221 is relatively large, which inhibits water mist formation and upward flow. When β is greater than 60°, the flue gas flow will directly blow onto the atomized water column, which will disrupt the stability of the atomized water column and thus affect water mist formation. By limiting β to 60°, it is beneficial for the atomized water mist to form a flow dynamic with the flue gas flow.

[0063] β can be any angle greater than or equal to 20° and less than or equal to 60°, such as β can be any angle among 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, and 60°.

[0064] Preferably, β = 45°, which helps the guide surface 222 to guide the flue gas flow to a region slightly below the atomization burst point of the atomized water column. The water mist generated above the atomization burst point of the atomized water column forms a flow force with the flue gas flow, guiding the atomized water mist to rise and enter the mist exhaust box 3.

[0065] In some embodiments, 2° ≤ α ≤ 10°. When α is less than 2°, the water mist generated by different atomizing heads 42 may collide with each other, affecting the fogging effect. When α is greater than 10°, the water mist generated by the atomizing head 42 may collide with the inner wall of the fog extraction box 3, affecting the fog extraction effect. By limiting 2° ≤ α ≤ 10°, it is possible to avoid the water mist generated by different atomizing heads 42 colliding with each other and affecting the fogging effect, and also to avoid the water mist generated by the atomizing head 42 colliding with the inner wall of the fog extraction box 3 and affecting the fog extraction effect.

[0066] α can be any angle greater than or equal to 2° and less than or equal to 10°, such as α can be any angle among 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° and 10°. Preferably, α = 5°.

[0067] In some embodiments, H1 = h1 + h2 + h3, where h1 represents the height difference between the top surface of the atomizer 4 and the standard water level, h2 represents the height difference between the center of the end face of the atomizing head 42 and the top surface of the atomizer 4, and h3 represents the height difference between the atomization blasting point of the atomized water column and the standard water level.

[0068] Among them, 20mm ≤ h1 ≤ 60mm, 0mm < h2 ≤ 10mm, 20mm ≤ h3 ≤ 40mm. By limiting the value ranges of h1, h2, and h3, the range of H1 is determined. Once h1, h2, and h3 are determined, H1 is correspondingly determined.

[0069] When h1 is less than 20mm, the water level in the atomization housing 2 is too close to the top surface of the atomizer 4. When the atomizer 4 works, the high-frequency vibration energy is relatively large, instantly blasting the water into water droplets, and the atomization effect is not ideal. The energy generated by the high-frequency vibration when the atomizer 4 works needs to overcome the potential energy of the water column itself in order to cause the condensed water to burst at the atomization blasting point of the atomized water column to form water mist. When h1 is greater than 60mm, the greater the height difference between the top surface of the atomizer 4 and the water level in the atomization housing 2, the higher the energy required for water mist formation, and there may be a phenomenon that the surface tension of the atomized water column cannot be broken to generate water mist. By limiting 20mm ≤ h1 ≤ 60mm, the atomization effect can be effectively guaranteed.

[0070] It should be noted that h1 can take any value greater than or equal to 20mm and less than or equal to 60mm. For example, h1 can take any value among 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm. Preferably, h1 = 45mm.

[0071] h2 is determined according to the structure of the atomizer 4 and the included angle α. h2 can take any value greater than or equal to 0mm and less than or equal to 10mm. For example, h2 can take any value among 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm. Preferably, h2 = 5mm.

[0072] When h3 is greater than 40mm, the atomized water column is too high, and it is necessary to increase the space for atomization above the atomized water column, which will increase the height of the condensation heat exchange device in the vertical direction, increasing the production cost and occupied space of the gas water heating device. When h3 is less than 40mm, it will cause the atomized water column to be too low, extremely likely to cause the flue gas to directly impact the atomized water mist above the atomized water column, resulting in a relatively large downward fog formation pressure formed by the flue gas airflow, which will inhibit the formation of water mist and the upward flow of water mist. By limiting 20mm ≤ h3 ≤ 40mm, it is possible to minimize the downward inhibitory effect of the flue gas airflow on the water mist on the premise that the occupied space of the condensation heat exchange device in the vertical direction will not be too large.

[0073] It should be noted that h3 can be any value greater than or equal to 20mm and less than or equal to 40mm, and h1 can be any value among 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 38mm, and 40mm.

[0074] In some embodiments, 30mm ≤ h4 ≤ 70mm, where h4 represents the height difference between the top surface of the atomizer 4 and the highest permissible water level inside the atomizing housing 2. When h4 is less than 30mm, the water level inside the atomizing housing 2 is lower than the standard water level, and the height difference between the water level inside the atomizing housing 2 and the standard water level is too large. The high-frequency vibration energy of the atomizer 4 during operation is large, instantly breaking the water into droplets, resulting in an unsatisfactory atomization effect. When h4 is greater than 70mm, the water level inside the atomizing housing 2 is higher than the standard water level, and the height difference between the water level inside the atomizing housing 2 and the standard water level is too large. The energy generated by the high-frequency vibration of the atomizer 4 during operation needs to overcome the potential energy of the water column itself, which may not be able to break the surface tension of the water column to generate water mist. By limiting 30mm ≤ h4 ≤ 70mm, when the atomizer 4 is working, the atomizing head 42 generates a water column through high-frequency vibration, and the surface of the atomized water column absorbs energy to break the surface tension between the liquids to form water mist. The water mist is then guided upwards by the flue gas flowing above the mist outlet 221.

[0075] H2 = h1 + h3 - h4, where H2 represents the height difference between the atomization blast point and the highest permissible water level inside the atomization shell 2. The magnitude of H2 is determined based on h1, h3, and h4. Once h1, h3, and h4 are determined, H2 is also determined accordingly.

[0076] In some embodiments, L = k × H × tanα, 3 ≤ k ≤ 7. This not only prevents the water mist or atomized water column formed by atomization from impacting the inner peripheral wall of the atomizing shell 2, but also avoids L being too large, which would increase the horizontal dimension of the entire atomizing shell 2, thereby increasing production costs and the space occupied by the condensation heat exchange device in the horizontal direction.

[0077] It should be noted that k can be any value greater than or equal to 3 and less than or equal to 7, such as 3, 3.5, 3, 4.5, 5, 5.5, 6, 6.5, or 7.

[0078] In some embodiments, H = h2 + h5, where h5 represents the height difference between the top surface of the atomizing housing 2 and the top surface of the atomizer 4, and 35mm ≤ h5 ≤ 90mm. Determining H by limiting h2 and h5 facilitates the determination of the size of L based on H, k, and α.

[0079] When h5 is greater than 90mm, the height difference between the top surface of the atomizing housing 2 and the top surface of the atomizer 4 becomes too large. This necessitates increasing the power of the atomizer 4 to ensure that the water mist generated by the atomizer 4 reaches the top surface of the atomizing housing 2. This results in high energy consumption, high operating costs, and correspondingly, high-frequency vibration, increasing the vibration amplitude of the entire gas water heater. When h5 is less than 35mm, the water level inside the atomizing housing 2 easily falls below the standard water level, or even below the minimum allowable water level, requiring the atomizer 4 to be shut down and frequently restarted. By limiting h5 to 35mm ≤ h5 ≤ 90mm, not only can frequent restarts of the atomizer 4 be avoided, but the noise impact of the high-frequency vibration of the atomizer 4 on the gas water heater can also be reduced.

[0080] It should be noted that h5 can be any value greater than or equal to 35mm and less than or equal to 90mm. For example, h1 can be any value among 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, and 90mm. Preferably, h1 = 55mm.

[0081] In some embodiments, h4 < h5 < 1.1h4. This not only prevents condensate in the atomizing housing 2 from overflowing through the top surface of the atomizing housing 2, but also ensures that the flue gas introduced from the top of the guide structure 22 is below the water mist burst point of the atomized water column, avoiding the suppression of atomized water mist generation and flow by the flue gas pressure itself. It also ensures that the flue gas airflow guided by the guide surface 222 to the area above the mist outlet 221 guides the atomized water mist generated by the high-frequency vibration of the atomizer 4 to rise and enter the mist discharge box 3, ensuring that the atomized water mist can be smoothly formed into mist and carried out of the atomizing housing 2 by the flue gas.

[0082] It should be noted that h5 can be any value greater than h4 and less than 1.1h4, such as h4 = 1.01h4, 1.02h4, 1.03h4, 1.04h4, 1.05h4, 1.06h4, 1.07h4, 1.08h4, 1.09h4.

[0083] In some embodiments, 1 < H / h1 ≤ 5 / 3. For example, H / h1 = 4:3. This configuration can reduce the impact of the gap between the top surface of the atomizer 4 and the center of the end face of the atomizing head 42 on mist formation when the atomizing head 42 is arranged at an angle.

[0084] In some embodiments, the height difference between the upper end face of the flow guiding structure 22 on the side close to the first smoke inlet 11 and the lower end face of the mist exhaust box 3 is x1, and the height difference between the upper end face of the flow guiding structure 22 on the side away from the first smoke inlet 11 and the lower end face of the mist exhaust box 3 is x2, where x1 < x2 < 2x1.

[0085] The condenser heat exchanger tube 5 is located horizontally between the desiccant box 3 and the first flue gas inlet 11. After exchanging heat with the cold water in the condenser heat exchanger tube 5, the flue gas flows towards the side of the desiccant box 3 closest to the first flue gas inlet 11. Some of the flue gas passes through the side of the desiccant box 3 closest to the first flue gas inlet 11 and enters the desiccant box 3 through the second flue gas inlet 31. The remaining flue gas then flows through the opposite sides of the desiccant box 3 towards the side of the desiccant box 3 furthest from the first flue gas inlet 11. The flue gas on the side of the desiccant box 3 furthest from the first flue gas inlet 11 enters the desiccant box 3 through the second flue gas inlet 31. By limiting x2 to x1, the amount of flue gas Q1 entering the desiccant box 3 from the side closest to the first flue gas inlet 11 can be reduced, and the amount of flue gas Q2 entering the desiccant box 3 furthest from the first flue gas inlet 11 can be increased. By limiting x2 to 2x1, we can avoid Q1 being less than Q2 and the difference being too large, thus making Q1 and Q2 closer. This ensures that the flue gas flows evenly into the exhaust box 3 from all sides, which is beneficial to improve the more balanced power of the flue gas entering the exhaust box 3 from different positions.

[0086] It should be noted that x2 can be any value greater than x1 and less than 2x1, such as any value among 1.1x1, 1.2x1, 1.3x1, 1.4x1, 1.5x1, 1.6x1, 1.7x1, 1.8x1, and 1.9x1.

[0087] In some embodiments, the lower end face of the exhaust box 3 and the upper end face of the guide structure 22 are vertically spaced to form an opening 100. The width of the opening 100 gradually increases vertically from the side of the opening 100 near the first smoke inlet 11 to the side of the opening 100 away from the first smoke inlet 11. This arrangement facilitates the even flow of flue gas from all sides of the exhaust box 3 into the exhaust box 3, thereby improving the balance of the flue gas flow dynamics entering the exhaust box 3 from different positions.

[0088] For example, the lower end face of the exhaust box 3 is horizontally arranged, and the upper end face of the guide structure 22 is inclined relative to the horizontal plane, so that the width of the opening 100 gradually increases in the vertical direction along the direction from the side of the opening 100 near the first smoke inlet 11 to the side of the opening 100 away from the first smoke inlet 11. This facilitates the uniform flow of flue gas from all sides of the exhaust box 3 into the exhaust box 3, thereby improving the more balanced dynamics of the flue gas entering the exhaust box 3 from different positions.

[0089] As an alternative, the upper surface of the flow guiding structure 22 can also be arranged in a stepped manner. Specifically, the horizontal cross-section of the lower end of the mist box 3 is rectangular, and the width direction of the lower part of the mist box 3 is the horizontal direction from the side of the opening 100 near the first smoke inlet 11 to the side of the opening 100 away from the first smoke inlet 11. The length direction of the lower part of the mist box 3 is perpendicular to the width direction of the lower part of the mist box 3. The flow guiding structure 22 has a first sidewall and a second sidewall arranged opposite to each other along the width direction of the mist box 3. The first sidewall is located between the first smoke inlet 11 and the second sidewall along the width direction of the mist box 3. x1 is the height difference between the upper surface of the first sidewall, which is horizontally arranged, and the lower surface of the mist box 3. x2 is the height difference between the upper surface of the second sidewall, which is horizontally arranged, and the lower surface of the mist box 3. x2 is greater than x1. In other words, the upper surface of the second sidewall is lower than the upper surface of the first sidewall.

[0090] For example, the guide surface 222 is an inclined plane. In other embodiments, the guide surface 222 may also be an arc surface.

[0091] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0092] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A condensing heat exchanger, characterized in that, include: The condenser shell (1) is provided with a first flue gas inlet (11); Atomizing housing (2), the top of the atomizing housing (2) is provided with a mist outlet (221) communicating with the condensing housing (1), and the atomizing housing (2) is provided with a water inlet communicating with the condensing housing (1) and located below the mist outlet (221); Atomizer (4) is located at the bottom inner part of the atomizing housing (2). The atomizer (4) includes an atomizing body (41) and an atomizing head (42) located at the top of the atomizing body (41). Along the direction from bottom to top, the atomizing head (42) gradually moves away from the central axis of the atomizing housing (2). The angle between the center line of the end face of the atomizing head (42) and the central axis of the atomizing housing (2) is α. L>H×tanα, where L represents the minimum horizontal distance between the center of the end face of the atomizing head (42) and the inner peripheral wall of the atomizing shell (2), and H represents the height difference between the center of the end face of the atomizing head (42) and the top surface of the atomizing shell (2).

2. The condensation heat exchanger according to claim 1, characterized in that, 2°≤α≤10°。 3. The condensation heat exchanger according to claim 1, characterized in that, L=k×H×tanα, 3≤k≤7.

4. The condensing heat exchanger according to any one of claims 1 to 3, characterized in that, The atomizing housing (2) includes a housing body (21) with a top opening and a flow guiding structure (22) surrounding the top opening of the housing body (21). The top opening of the flow guiding structure (22) forms the mist outlet (221). The flow guiding structure (22) is provided with a flow guiding surface (222). Along the direction from bottom to top, the flow guiding surface (222) gradually approaches the central axis of the atomizing housing (2). The angle between the flow guiding surface (222) and the central axis of the atomizing housing (2) is β. β=arctan(L-H1×tanα) / (H1-H), where L represents the minimum horizontal distance between the center of the end face of the atomizing head (42) and the inner peripheral wall of the atomizing shell (2), and H1 represents the height difference between the atomization burst point of the atomized water column generated by the atomizing head (42) and the center of the end face of the atomizing head (42) when the atomizer (4) is working under standard water level.

5. The condensation heat exchanger according to claim 4, characterized in that, 20°≤β≤60°。 6. The condensation heat exchanger according to claim 4, characterized in that, H1 = h1 + h2 + h3, where h1 represents the height difference between the top surface of the atomizer (4) and the standard water level, h2 represents the height difference between the center of the end face of the atomizing head (42) and the top surface of the atomizer (4), and h3 represents the height difference between the atomization burst point of the atomized water column and the standard water level. 20mm≤h1≤60mm; and / or, 0mm<h2≤10mm; and / or, 20mm≤h3≤40mm.

7. The condensation heat exchanger according to claim 6, characterized in that, 30mm≤h4≤70mm, where h4 represents the height difference between the top surface of the atomizer (4) and the highest allowable water level inside the atomizing housing (2).

8. The condensation heat exchanger according to claim 7, characterized in that, H = h2 + h5, where h5 represents the height difference between the top surface of the atomizing housing (2) and the top surface of the atomizer (4); 35mm≤h5≤90mm.

9. The condensation heat exchanger according to claim 8, characterized in that, h4 < h5 < 1.1h4.

10. The condensation heat exchanger according to claim 4, characterized in that, The condensation heat exchange device also includes a mist box (3), the upper end of which is connected to the outside atmosphere, and the lower end of which forms a second smoke inlet (31) located inside the condensation shell (1). The second smoke inlet (31) and the mist outlet (221) are arranged above the mist outlet (221) respectively. The height difference between the upper end face of the flow guiding structure (22) near the first smoke inlet (11) and the lower end face of the mist exhaust box (3) is x1, and the height difference between the upper end face of the flow guiding structure (22) away from the first smoke inlet (11) and the lower end face of the mist exhaust box (3) is x2, where x1 < x2 < 2x1.

11. The condensation heat exchanger according to claim 10, characterized in that, The lower end face of the de-fogging box (3) and the upper end face of the flow guiding structure (22) are vertically spaced to form an opening (100). The width of the opening (100) gradually increases in the vertical direction from the side of the opening (100) close to the first smoke inlet (11) to the side of the opening (100) away from the first smoke inlet (11).

12. A gas-fired hot water equipment, characterized in that, Includes the condensing heat exchange device according to any one of claims 1 to 11.

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