Condensing heat exchanger and gas-fired hot water equipment

Abstract

This utility model belongs to the technical field of gas-fired water heating equipment, and discloses a condensing heat exchange device and a gas-fired water heating device. By limiting the direction from bottom to top, the atomizing head gradually moves away from the central axis of the atomizing shell. Under the carrying action of hot flue gas, the water mist flows upward in the mist exhaust box. During the upward flow of the water mist in the main mist exhaust section, it continuously approaches the circumferential inner wall of the main mist exhaust section, preventing the water mist generated by the atomizing head from partially condensing into water droplets and falling back down during the mist formation process, thus affecting the atomizing head's atomization ability. At the same time, by limiting d1≥H1×tanα, the water mist generated by the atomizer at the standard water level will not come into contact with the inner wall of the main mist exhaust section and condense, thereby ensuring the mist exhaust effect.

Description

Technical Field

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

[0002] The working principle of a condensing gas water heater is as follows: the flue gas that has been cooled by the main heat exchanger is sent 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. When the atomizer operates, it atomizes the condensate in the atomizing housing into water mist. The water mist enters the exhaust box through the flue gas inlet at the bottom of the exhaust box and is then discharged into the outside atmosphere.

[0004] In actual use, it was found that after the water mist was carried into the mist box by the flue gas, a large amount of water mist directly rushed towards the inner wall of the mist box, causing the water mist to condense and flow back, which seriously affected the mist removal 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 demisting effect.

[0006] The second technical problem solved by this utility model is to provide a gas-fired hot water device that can improve the mist removal 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] The de-mist box includes a de-mist main body section whose upper end is connected to the outside atmosphere, and a second smoke inlet located inside the condensation shell at the lower end of the de-mist main body section. The second smoke inlet and the mist outlet are arranged vertically opposite each other above the mist outlet.

[0012] 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.

[0013] d1≥H1×tanα, where d1 represents the minimum horizontal distance between the inner peripheral wall of the mist exhaust body section and the center of the end face of the atomizing head, H1 represents the height difference between the center of the end face of the atomizing head and the highest mist formation height position, the highest mist formation height position is the highest position that the water mist generated by the atomizer can reach when it is working under standard water level.

[0014] The condensation heat exchange device described in this utility model has the following advantages compared with the prior art:

[0015] By limiting the direction from bottom to top, the atomizing head gradually moves away from the central axis of the atomizing shell. Carried by the hot flue gas, the water mist flows upward within the exhaust box. As the water mist flows upward within the main exhaust section, it continuously approaches the circumferential inner wall of the main exhaust section, preventing the water mist generated by the atomizing head from partially condensing into droplets and falling back down, thus affecting the atomizing head's atomization capability. Simultaneously, by limiting d1 ≥ H1 × tanα, the water mist generated by the atomizer operating at standard water levels will not condense against the inner wall of the main exhaust section, thereby ensuring effective mist extraction.

[0016] In one embodiment, 2°≤α≤10°.

[0017] In one embodiment, the defogging box further includes a defogging guide section, the lower end of which is connected to the upper end of the defogging main body section, and the upper end of which is in communication with the outside atmosphere.

[0018] The diameter of the main mist exhaust section is larger than the diameter of the mist outlet guide section; from bottom to top, the horizontal distance between the inner wall of the mist outlet guide section and the central axis of the mist exhaust box gradually decreases.

[0019] In one embodiment, the highest point of the main mist-expelling section is at the same height as the highest mist-forming height.

[0020] In one embodiment, H1 = H 成雾 +h1+h2, where H 成雾 h1 represents the height difference between the standard water level and the highest misting height, h2 represents the height difference between the standard water level and the top surface of the atomizer, and h2 represents the height difference between the top surface of the atomizer and the center of the end face of the atomizing head.

[0021] 200mm ≤ H 成雾 ≤ 240mm; and / or,

[0022] 20mm ≤ h1 ≤ 60mm; and / or,

[0023] 0mm < h2 ≤ 10mm.

[0024] In one embodiment, 15mm ≤ d1 ≤ 50mm.

[0025] In one embodiment, the atomizing head is provided with at least two, and at least two of the atomizing heads are circumferentially spaced apart around the atomizing housing.

[0026] In one embodiment, the horizontal distance between the vertical line passing through the center of the end face of the atomizing head and the central axis of the mist exhaust box is 0.5d2, and 35mm ≤ d2 ≤ 100mm.

[0027] In one embodiment, the mist exhaust box further includes a mist inlet diversion section, and the upper end of the mist inlet diversion section is connected to the lower end of the mist exhaust main section; the mist inlet diversion section is arranged around the outer periphery of the second smoke inlet; along the direction from bottom to top, the inner peripheral wall of the mist inlet diversion section gradually approaches the central axis of the mist exhaust box;

[0028] The lower end of the mist inlet diversion section is connected with a mist inlet straight section, and along the direction from bottom to top, the horizontal distance between the inner peripheral wall of the mist inlet straight section and the central axis of the mist exhaust box remains unchanged;

[0029] The axial length of the mist inlet straight section is n1, and 2mm ≤ n1 ≤ 10mm; and / or, the axial length of the mist inlet diversion section is n2, and 5mm ≤ n2 ≤ 30mm.

[0030] In one embodiment, 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.

[0031] In one embodiment, the atomizing housing includes a housing body with an open top, and a diversion structure arranged around the outer periphery of the open top of the housing body, and 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;

[0032] β = arctan(L - H2 × tanα) / (H2 - H), where L represents the minimum horizontal distance between the center of the end face of the atomizing head and the inner wall of the atomizing shell located on the same side of the atomizing body as the atomizing head, and H2 represents the height difference between the atomization burst point of the atomized water column generated by the atomizing head and the center of the end face of the atomizing head when the atomizer is working at the standard water level.

[0033] In one embodiment, 20°≤β≤60°.

[0034] In one embodiment, 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.

[0035] The second technical problem mentioned above is solved by the following technical solution:

[0036] Gas-fired hot water equipment, including the condensing heat exchange device provided in any of the above embodiments.

[0037] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages:

[0038] The gas-fired water heater provided by this utility model includes the aforementioned condensing heat exchange device. By limiting the direction from bottom to top, the atomizing head gradually moves away from the central axis of the atomizing shell. Under the carrying action of hot flue gas, water mist flows upward in the mist exhaust box. During the upward flow of water mist in the main mist exhaust section, it continuously approaches the circumferential inner wall of the main mist exhaust section, preventing the water mist generated by the atomizing head from partially condensing into water droplets and falling back down during the mist formation process, thus affecting the atomizing head's atomization capability. At the same time, by limiting d1≥H1×tanα, the water mist generated by the atomizer operating at the standard water level will not come into contact with the inner wall of the main mist exhaust section and condense, thereby ensuring the mist exhaust effect. Attached Figure Description

[0039] Figure 1 This is a first cross-sectional view of the condensation heat exchange device provided in this embodiment of the present invention;

[0040] Figure 2 This is a second sectional view of the condensation heat exchange device provided in this embodiment of the present invention;

[0041] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0042] Figure 4 This is a simplified schematic diagram of the condensation heat exchange device provided in this embodiment of the utility model.

[0043] In the picture:

[0044] 1. Condenser housing; 11. First flue gas inlet;

[0045] 2. Atomizing shell; 21. Shell body; 22. Flow guiding structure; 221. Atom outlet; 222. Flow guiding surface;

[0046] 3. Demister box; 31. Main demister section; 311. Second smoke inlet; 321. Demister intake section; 322. Direct demister intake section; 331. Demister outlet section; 332. Direct demister outlet section;

[0047] 4. Atomizer; 41. Atomizing body; 42. Atomizing head;

[0048] 5. Condensing heat exchange tubes;

[0049] 100. Opening. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] like Figures 1 to 3 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 mist exhaust box 3 includes a mist exhaust main section 31 whose upper end communicates with the outside atmosphere. The lower end of the mist exhaust main section 31 forms a second flue gas inlet 311 located inside the condenser shell 1. The second flue gas inlet 311 and the mist outlet 221 are vertically opposite each other and located above the mist outlet 221. The atomizer 4 is located at the bottom inner part of the atomizing shell 2. The atomizer 4 includes an atomizing body 41 and an atomizing head 42 located at the top of the atomizing body 41.

[0056] 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 311.

[0057] 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 311 and the mist outlet 221 drives the hot flue gas near the mist outlet 221 to flow upward and enter the exhaust box 3 through the second flue gas inlet 311, and then is discharged to the outside atmosphere.

[0058] 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.

[0059] As the atomizing head 42 gradually moves away from the central axis of the atomizing housing 2 from bottom to top, the water mist continuously approaches the circumferential inner wall of the exhaust box 3 after entering it. Therefore, in this embodiment, d1 ≥ H1 × tanα, where d1 represents the minimum horizontal distance between the inner circumferential wall of the exhaust body section 31 and the center of the end face of the atomizing head 42; H1 represents the height difference between the center of the end face of the atomizing head 42 and the highest mist-forming height position, where the highest mist-forming height position is the highest position that the water mist generated by the atomizer 4 can reach under standard water level conditions; and α is the angle between the center line of the end face of the atomizing head 42 and the central axis of the atomizing housing 2. 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, and the center line 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.

[0060] For example, d1 = H1 × tanα.

[0061] During the operation of the gas-fired hot water equipment, hot flue gas continuously enters the condenser shell 1 through the first flue gas inlet 11. After being cooled by the condenser heat exchange tube 5, the hot flue gas continuously enters the mist exhaust box 3 through the second flue gas inlet 311. Under the carrying effect of the hot flue gas, water mist flows upward in the mist exhaust box 3. Although the water mist will continuously approach the circumferential inner wall of the mist exhaust body section 31 during its upward flow, since d1≥H1×tanα, the water mist generated by the atomizer 4 at the standard water level will not come into contact with the inner wall of the mist exhaust body section 31 and condense, thus ensuring the mist exhaust effect.

[0062] Specifically, H1 = H 成雾 +h1+h2, where H 成雾 The height difference between the standard water level and the highest misting height is represented by h1, h2, and h1. h1 represents the height difference between the standard water level and the top surface of the atomizer 4, and h2 represents the height difference between the top surface of the atomizer 4 and the center of the end face of the atomizing head 42. When H1 = H... 成雾 When h1 + h2, H1 × tanα is the minimum value of d1.

[0063] In some embodiments, 200mm≤H 成雾 ≤240mm. In H 成雾 When the height is less than 200mm, the height requirement for atomization cannot be met. 成雾 When the height exceeds 240mm, the vertical height of the mist box 3 becomes excessive, increasing the vertical space occupied by the gas-fired water heater and raising production costs. By limiting the height to 200mm ≤ H... 成雾≤240mm not only meets the height requirements for atomization, but also avoids the space occupied by gas-fired water heaters in the vertical direction and excessive production costs.

[0064] H 成雾 You can select any value greater than or equal to 200mm and less than or equal to 240mm, such as H. 成雾 Any value from 200mm, 205mm, 210mm, 215mm, 220mm, 225mm, 230mm, 235mm, and 240mm can be selected. Preferably, H... 成雾 =225mm.

[0065] In some embodiments, the height difference between the standard water level and the top surface of the atomizer 4 is h1, where 20mm ≤ h1 ≤ 60mm.

[0066] When h1 is less than 20mm, the water level inside the atomizing housing 2 is too close to the top surface of the atomizer 4. The high-frequency vibration energy of the atomizer 4 during operation is too high, instantly breaking the water into droplets, resulting in unsatisfactory atomization. The energy generated by the high-frequency vibration of the atomizer 4 needs to overcome the potential energy of the water column itself to cause the condensed water to burst at the atomization 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 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 failing to produce water mist. By limiting the atomization to 20mm ≤ h1 ≤ 60mm, the atomization effect can be effectively guaranteed.

[0067] It should be noted that h1 can be any value greater than or equal to 20mm and less than or equal to 60mm. For example, h1 can be any value among 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, and 60mm. Preferably, h1 = 45mm.

[0068] In some embodiments, 0mm ≤ h2 ≤ 10mm. h2 is determined according to the structure of the atomizer 4 and the included angle α. h2 can be any value greater than 0mm and less than or equal to 10mm, such as any value among 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm. Preferably, h2 = 5mm.

[0069] In some embodiments, 15mm ≤ d1 ≤ 50mm. When d1 is less than 15mm, the atomized water mist is prone to colliding with the inner wall of the mist extraction box 3, affecting the mist extraction effect. When d1 is greater than 50mm, the volume of the mist extraction box 3 will be too large, increasing the space occupied by the mist extraction box 3, thus increasing the size and cost of the gas water heater. By limiting d1 to 50mm, the size and cost requirements of the gas water heater can be met while avoiding the atomized water mist colliding with the inner wall of the mist extraction box 3 and affecting the mist extraction effect.

[0070] d1 can be any value greater than or equal to 15mm and less than or equal to 50mm, such as any value among 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, and 50mm. Preferably, d1 = 30mm.

[0071] 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.

[0072] 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 selected from 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° and 10°. Preferably, α = 5°.

[0073] In some embodiments, the de-fogging box 3 further includes a de-fogging guide section 331, the lower end of which is connected to the upper end of the de-fogging main body section 31, and the upper end of which is in communication with the outside atmosphere; the pipe diameter of the de-fogging main body section 31 is larger than the pipe diameter of the de-fogging guide section 331; and the horizontal distance between the inner wall of the de-fogging guide section 331 and the central axis of the de-fogging box 3 gradually decreases from bottom to top.

[0074] The inner wall of the mist-exit guide section 331 is used to guide the hot flue gas mixed with water mist to flow upward more smoothly, so as to discharge the hot flue gas mixed with water mist into the outside atmosphere.

[0075] For example, the horizontal cross-section of the main exhaust section 31 is rectangular. Specifically, the width direction of the main exhaust section 31 is the horizontal direction from the side where the first flue gas inlet 11 is located to the side where the exhaust box 3 is located, and the length direction of the main exhaust section 31 is the horizontal direction perpendicular to the width direction of the main exhaust section 31. The condenser heat exchange tube 5 is arranged between the first flue gas inlet 11 and the exhaust box 3 along the width direction of the main exhaust section 31. This facilitates the delivery of more flue gas into the exhaust box 3 through the second flue gas inlet 311.

[0076] For example, the horizontal cross-section of the mist outlet guide section 331 is circular. Specifically, the mist outlet guide section 331 is a tapered tube that is narrower at the top and wider at the bottom. The inner circumferential wall of the tapered tube is a conical surface, which forms a guide surface. This arrangement allows the guide surface to guide the flue gas mixed with water mist, facilitating the discharge of the hot flue gas mixed with water mist into the outside atmosphere. It should be noted that the horizontal cross-section of the mist outlet guide section 331 can also be rectangular. In this case, it is required that the side walls of the mist outlet guide section 331 be arranged at an angle so that the horizontal distance between the inner wall of the mist outlet guide section 331 and the central axis of the mist exhaust box 3 gradually decreases from bottom to top.

[0077] In some embodiments, the upper end of the mist-exiting guide section 331 is connected to a mist-exiting direct flow section 332, which communicates with the external atmosphere. Exemplarily, the horizontal cross-section of the mist-exiting guide section 331 is circular; specifically, the mist-exiting direct flow section 332 is a circular tube, which facilitates the guidance of the mist-mixed flue gas with water mist by cooperating with the mist-exiting guide section 331, so as to smoothly discharge the flue gas with water mist into the outside atmosphere.

[0078] In some embodiments, the highest point of the fog exhaust main section 31 and the highest fog formation height are at the same height.

[0079] Since the horizontal distance between the inner wall of the mist outlet section 331 and the central axis of the mist discharge box 3 gradually decreases from bottom to top, and d1≥H1×tanα, by limiting the highest point of the mist discharge main section 31 and the highest mist formation height to be at the same height, the water mist can be prevented from hitting the inner wall of the mist outlet section 331, thus ensuring the mist discharge effect.

[0080] 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.

[0081] By setting at least two atomizing heads 42, the atomization requirements can be met; and along the direction from bottom to top, the central axis of the atomizing head 42 gradually moves 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.

[0082] In some embodiments, the horizontal distance between the vertical line passing through the center of the end face of the atomizing head 42 and the central axis of the exhaust box 3 is 0.5d2, where 35mm≤d2≤100mm. It should be noted that the vertical line passing through the center of the end face of the atomizing head 42 refers to the vertical line passing through the center of the top surface of the atomizing head 42, and this vertical line is parallel to the central axis of the atomizing body 41. When two atomizing heads 42 are provided, the two atomizing heads 42 are distributed at 180° and along the horizontal direction from the side where the first smoke inlet 11 is located to the side where the exhaust box 3 is located; d2 is the horizontal distance between the vertical lines passing through the centers of the end faces of the two atomizing heads 42.

[0083] When d2 is less than 35mm, the water mist generated by different atomizing heads 42 will collide and condense; when d2 is greater than 100mm, the volume of the mist exhaust box 3 will increase, which is not only detrimental to the miniaturization of gas water heaters but also increases costs. By limiting d2 to 100mm, the collision of water mist generated by different atomizing heads 42 can be avoided, thus preventing condensation, while also meeting the miniaturization requirements of gas water heaters and reducing costs.

[0084] It should be noted that d2 can be any value greater than or equal to 35mm and less than or equal to 100mm. For example, 2d2 can be any value among 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, and 100mm. Preferably, d2 = 55mm.

[0085] In some embodiments, the de-mist box 3 further includes a mist inlet guide section 321, the upper end of which is connected to the lower end of the de-mist body section 31; the mist inlet guide section 321 is arranged around the outer periphery of the second smoke inlet 311; along the direction from bottom to top, the inner peripheral wall of the mist inlet guide section 321 gradually approaches the central axis of the de-mist box 3.

[0086] By limiting the direction from bottom to top, the inner peripheral wall of the mist inlet section 321 gradually approaches the central axis of the mist exhaust box 3. On the one hand, this helps to guide some of the flue gas to flow more smoothly from the second smoke inlet 311 into the mist exhaust box 3. On the other hand, it avoids the flue gas inhibiting the atomized water mist generated by the atomizer 4. This ensures that the flue gas flows from bottom to top around the inner peripheral wall of the mist exhaust box 3. The upward thrust generated by the flue gas provides upward momentum for the atomized water mist in the middle of the mist exhaust box 3, so as to coordinate the atomized water mist to flow to the outlet of the mist exhaust box 3.

[0087] In some embodiments, the angle between the inner peripheral wall of the mist inlet section 321 and the central axis of the mist outlet box 3 is γ, where 5°≤γ≤45°.

[0088] When γ is less than 5°, the flue gas may blow directly onto the water mist, thus suppressing the water mist below; when γ is greater than 45°, the flue gas's ability to guide the atomized water mist in the middle of the exhaust box 3 upwards may be weaker. By limiting γ to 45°, the suppressive effect of the flue gas on the atomized water mist generated by the atomizer 4 can be minimized, while maximizing the upward flow of the atomized water mist in the middle of the exhaust box 3 to facilitate its flow towards the outlet of the exhaust box 3.

[0089] It should be noted that γ can be any angle value among 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, and 45°. Preferably, γ = 30°.

[0090] In some embodiments, the lower end of the mist inlet guide section 321 is connected to the mist inlet direct flow section 322, and the horizontal distance between the inner peripheral wall of the mist inlet direct flow section 322 and the central axis of the mist exhaust box 3 remains unchanged along the upward direction. The combined use of the mist inlet direct flow section 322 and the mist inlet guide section 321 to guide the flue gas facilitates the guidance of the flue gas into the mist exhaust box 3. Exemplarily, the horizontal cross-section of the mist inlet direct flow section 322 is rectangular, the length direction of the mist inlet direct flow section 322 is consistent with the length direction of the mist inlet guide section 321, and the length direction of the mist inlet direct flow section 322 is consistent with the width direction of the mist inlet guide section 321.

[0091] In some embodiments, the axial length of the mist inlet direct flow section 322 is n1, where 2mm ≤ n1 ≤ 10mm; the axial length of the mist inlet guide section 321 is n2, where 5mm ≤ n2 ≤ 30mm. It should be noted that the axial directions of both the mist inlet direct flow section 322 and the mist inlet guide section 321 are vertical.

[0092] By limiting the range of values ​​for n1 and n2, it is beneficial to ensure the guiding effect of the flue gas into the exhaust box 3, while minimizing the inhibitory effect of the flue gas on the atomized water mist generated by the atomizer 4, and maximizing the upward flow of the atomized water mist in the middle of the exhaust box 3 to coordinate the flow of the atomized water mist to the outlet of the exhaust box 3; at the same time, it avoids the inlet drainage section 321 and the inlet direct flow section 322 occupying a large vertical space, thus reducing costs.

[0093] n1 can be any value within the range of 2mm to 10mm, such as 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. Preferably, n1 is 5mm.

[0094] n2 can be any value within the range of 5mm or greater and 30mm or less, such as 5mm, 10mm, 15mm, 20mm, 25mm, or 30mm. Preferably, n2 is 40mm.

[0095] In some embodiments, 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 housing 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 housing 2, and 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.

[0096] 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.

[0097] 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 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.

[0098] 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. Since the guide structure 22 is located above the atomizing housing 2 and moves from bottom to top, the guide surface 222 gradually approaches the central axis of the atomizing housing 2. The guide surface 222 guides the hot flue gas in the condenser housing 1 into the second flue gas inlet 311 in an upward direction. This reduces the downward misting pressure formed by the hot flue gas between the second flue gas inlet 311 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 311 in an upward direction, which helps the hot flue gas carry the water mist discharged from the mist outlet 221 into the mist exhaust box 3 and discharge it into the outside atmosphere. This prevents the hot flue gas from 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.

[0099] In some embodiments, the angle between the guide surface 222 and the central axis of the atomizing housing 2 is β, β=arctan(L-H2×tanα) / (H2-H), where L represents the minimum horizontal distance between the center of the end face of the atomizing head 42 and the inner wall of the atomizing housing 2, and H2 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.

[0100] For ease of understanding, the difference between H2 and H is denoted as H3, where H3 = H2 - H. H3 represents the height difference between the atomization burst point of the atomized water column and the top surface of the atomization shell 2.

[0101] 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 4 The water column above the water surface is the atomized water column. Figure 4 The horizontal dashed line in the diagram represents the height of the atomization explosion point; the atomization explosion point of the atomized water column can be directly measured through experiments.

[0102] 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. Typically, the distance between the atomization burst point of the water column and the center of the end face of the atomizing head 42 ranges from 40mm to 110mm.

[0103] 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 formation. By limiting β = arctan(L - H2 × tanα) / (H2 - 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 4 The arrow indicates the flue gas flow. The water mist generated at 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 and enter the mist discharge box 3, ensuring that the atomized water mist can be successfully formed into mist and carried out of the atomization shell 2 by the flue gas.

[0104] 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.

[0105] β can be any angle greater than or equal to 20° and less than or equal to 60°, such as any angle among 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, and 60°.

[0106] 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 at 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.

[0107] 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.

[0108] The condenser heat exchanger tube 5 is located horizontally between the mist 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 mist box 3 closest to the first flue gas inlet 11. Some of the flue gas passes through the side of the mist box 3 closest to the first flue gas inlet 11 and enters the mist box 3 through the second flue gas inlet 311. The remaining flue gas then flows through the opposite sides of the mist box 3 to the side of the mist box 3 furthest from the first flue gas inlet 11. The flue gas on the side of the mist box 3 furthest from the first flue gas inlet 11 enters the mist box 3 through the lower opening of the mist inlet guide section 321. By limiting x2 to x1, the amount of flue gas Q1 entering the mist box 3 via the side of the mist box 3 closest to the first flue gas inlet 11 can be reduced, and the amount of flue gas Q2 entering the mist box 3 via the side of the mist 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.

[0109] 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.

[0110] 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.

[0111] Specifically, the lower end face of the mist exhaust box 3 is horizontally positioned, meaning the lower end face of the mist inlet direct current section 322 is horizontally positioned, while the upper end face of the flow guiding structure 22 is inclined relative to the horizontal plane. This causes the width of the opening 100 to gradually increase vertically 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 even flow of flue gas from all sides of the mist exhaust box 3 into the mist exhaust box 3, thereby improving the balance of the flue gas dynamics entering the mist exhaust box 3 from different positions.

[0112] 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 mist inlet direct current section 322 is rectangular, and the width direction of the mist inlet direct current section 322 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 mist inlet direct current section 322 is perpendicular to the width direction of the mist inlet direct current section 322. 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 inlet direct current section 322. The first sidewall is located between the first smoke inlet 11 and the second sidewall along the width direction of the mist inlet direct current section 322. x1 is the height difference between the upper surface of the first sidewall, which is horizontally arranged, and the lower surface of the mist inlet direct current section 322. 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.

[0113] For example, the guide surface 222 is an inclined plane. In other embodiments, the guide surface 222 may also be an arc surface.

[0114] 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.

[0115] 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); The de-fogging box (3) includes a de-fogging main body section (31) whose upper end is connected to the outside atmosphere. The lower end of the de-fogging main body section (31) forms a second smoke inlet (311) located inside the condenser shell (1). The second smoke inlet (311) and the mist outlet (221) are arranged vertically opposite each other above 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. d1≥H1×tanα, where d1 represents the minimum horizontal distance between the inner peripheral wall of the mist exhaust body section (31) and the center of the end face of the atomizing head (42), H1 represents the height difference between the center of the end face of the atomizing head (42) and the highest misting height position, the highest misting height position is the highest position that the water mist generated by the atomizer (4) can reach when working under standard water level.

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, The de-fogging box (3) also includes a de-fogging guide section (331), the lower end of which is connected to the upper end of the de-fogging main body section (31), and the upper end of which is connected to the outside atmosphere. The diameter of the main mist exhaust section (31) is larger than the diameter of the mist outlet section (331); from bottom to top, the horizontal distance between the inner wall of the mist outlet section (331) and the central axis of the mist exhaust box (3) gradually decreases.

4. The condensation heat exchanger according to claim 1, characterized in that, The highest point of the main fog-expelling section (31) is at the same height as the highest fog-forming height.

5. The condensation heat exchanger according to claim 1, characterized in that, H1 = H 成雾 +h1+h2, where H 成雾 h1 represents the height difference between the standard water level and the highest misting height, h2 represents the height difference between the standard water level and the top surface of the atomizer (4), and h2 represents the height difference between the top surface of the atomizer (4) and the center of the end face of the atomizing head (42). 200mm≤H 成雾 ≤240mm; and / or, 20mm≤h1≤60mm; and / or, 0mm<h2≤10mm.

6. The condensation heat exchanger according to claim 1, characterized in that, 15mm≤d1≤50mm.

7. The condensing heat exchanger according to any one of claims 1 to 6, characterized in that, The atomizing head (42) is provided with at least two, and the at least two atomizing heads (42) are arranged circumferentially around the atomizing shell (2).

8. The condensation heat exchanger according to claim 7, characterized in that, The horizontal distance between the vertical line passing through the center of the end face of the atomizing head (42) and the central axis of the mist discharge box (3) is 0.5d2, 35mm≤d2≤100mm.

9. The condensing heat exchanger according to any one of claims 1 to 6, characterized in that, The mist box (3) further includes a mist inlet guide section (321), the upper end of which is connected to the lower end of the mist exhaust body section (31); the mist inlet guide section (321) is arranged around the outer periphery of the second smoke inlet (311); along the direction from bottom to top, the inner peripheral wall of the mist inlet guide section (321) gradually approaches the central axis of the mist box (3); The lower end of the mist inlet section (321) is connected to the mist inlet direct flow section (322). Along the direction from bottom to top, the horizontal distance between the inner peripheral wall of the mist inlet direct flow section (322) and the central axis of the mist exhaust box (3) remains unchanged. The axial length of the mist inlet direct flow section (322) is n1, 2mm≤n1≤10mm; and / or, the axial length of the mist inlet guide section (321) is n2, 5mm≤n2≤30mm.

10. The condensing heat exchanger according to any one of claims 1 to 6, characterized in that, 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).

11. The condensation heat exchanger according to claim 10, 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-H2×tanα) / (H2-H), where L represents the minimum horizontal distance between the center of the end face of the atomizing head (42) and the inner wall of the atomizing shell (2) located on the same side of the atomizing body (41) as the atomizing head (42), and H2 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.

12. The condensation heat exchanger according to claim 11, characterized in that, 20°≤β≤60°。 13. The condensation heat exchanger according to claim 11, characterized in that, 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.

14. A gas-fired hot water equipment, characterized in that, Includes the condensing heat exchange device according to any one of claims 1 to 13.

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