Gas-fired water heating apparatus

Abstract

The utility model belongs to hot water equipment technical field, specifically disclose a kind of gas hot water equipment, including water heater body, outer flue, inner flue and mounting bracket, and the air inlet and air outlet are provided on water heater body, inner flue is communicated with air outlet, outer flue is fixedly sleeved on inner flue and is formed with the air inlet passage of intercommunication between inner flue;Outer flue includes elbow portion, variable diameter portion and inserts portion, elbow portion is connected in air inlet, variable diameter portion is connected between elbow portion and inserts portion, and variable diameter portion gradually reduces from the outer diameter of one end of connecting elbow portion to the one end of connecting inserts portion;Mounting bracket is set on water heater body, and the back of mounting bracket projects from the back of water heater body or flush with the back of water heater body, the horizontal distance of the axis of air inlet and the end surface of one end of connecting inserts portion of variable diameter portion is less than the horizontal distance of the axis of air inlet and the back of mounting bracket.The above-mentioned gas hot water equipment is high in installation convenience.

Description

Technical Field

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

[0002] In recent years, with economic development and scientific and technological progress, people's living standards have greatly improved, and gas water heaters have begun to enter thousands of households. However, ordinary gas water heaters extract oxygen from the room for combustion during operation, thereby reducing the indoor oxygen content and posing a potential threat to users' lives. Therefore, the application of balanced flue gas water heaters is becoming increasingly widespread.

[0003] Balanced flue gas water heaters use a double-layer flue design to draw in outdoor air for combustion, while exhaust gases are discharged outdoors through the inner flue, avoiding waste of indoor space. However, in currently available balanced flue gas water heaters, the outer diameter of the outer flue is usually larger than that of a regular gas water heater. Therefore, if you need to replace a regular gas water heater with a balanced flue gas water heater, you need to enlarge the existing mounting holes in the wall or window, which is inconvenient.

[0004] Therefore, related technologies propose a flue assembly that connects the outer bend and the through-pipe of a balanced flue gas water heater using a reducer. The diameter of the outer bend is adapted to the diameter of the air inlet of the balanced flue water heater, and the outer diameter of the through-pipe is adapted to the size of the mounting hole, thus eliminating the need for hole enlargement. However, when a balanced flue gas water heater equipped with the above-mentioned flue assembly is fixed to the wall where the mounting hole is located using a mounting bracket, the combined length of the horizontally extending portion of the outer bend and the reducer may be excessive, potentially causing interference with the wall and affecting installation convenience. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a gas-fired water heater that is less likely to interfere with the wall or window where the mounting hole is located during installation, can adapt to different installation needs, and improves convenience.

[0006] The second technical problem solved by this utility model is to provide a gas-fired water heater that is less likely to interfere with the wall or window where the mounting hole is located during installation, can adapt to different installation needs, and improves convenience.

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

[0008] A gas-fired water heater includes a water heater body, an external flue pipe, an internal flue pipe, and a mounting bracket. The width of the back of the water heater body is greater than the width of the side of the water heater body. An air inlet and an air outlet are provided on the top of the water heater body. The internal flue pipe communicates with the air outlet. The external flue pipe is fixedly sleeved on the internal flue pipe, forming an air inlet channel between the external and internal flue pipes. The air inlet channel communicates with the air inlet. The external flue pipe includes a bent section, a reducing section, and an insert section. The insert section can pass through a mounting hole in a wall or window. The bent section is connected to the air inlet. The reducing section is connected between the bent section and the insert section, and the outer diameter of the reducing section gradually decreases from the end connected to the bent section to the end connected to the insert section. The mounting bracket is disposed on the water heater body, and the back of the mounting bracket protrudes from or is flush with the back of the water heater body.

[0009] Let a be the horizontal distance between the axis of the air inlet and the end face of the variable diameter part connected to the insertion part, and let l be the horizontal distance between the axis of the air inlet and the back of the mounting bracket, where a ≤ l.

[0010] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: the external flue pipe is connected to an insertion part that matches the size of the original mounting hole through a reducing part, allowing the external flue pipe to pass through the smaller mounting hole to the outside without the need for hole enlargement, thus improving installation convenience. More importantly, by limiting the distance between the end face of the reducing part connected to the insertion part and the axis of the air inlet of the water heater body, ensuring that it is no greater than the horizontal distance between the axis of the air inlet and the back of the mounting bracket, i.e., no greater than the horizontal distance between the axis of the air inlet and the wall or window where the mounting hole is located when the water heater body is installed with a back-mounted air outlet, the water heater body can avoid interference with the wall in different installation environments, further improving installation convenience.

[0011] In one embodiment, the outer diameter of the bend is d1, the outer diameter of the insertion part is d2, and 1.1≤d1 / d2≤1.45.

[0012] In one embodiment, la ≤ 10 mm.

[0013] In one embodiment, the radius of curvature of the axis of the bend is r, where 65mm ≤ r < 80mm.

[0014] In one embodiment, two mounting brackets are provided, and the two mounting brackets are respectively provided on the upper and lower sides of the back of the gas water heater.

[0015] The second technical problem mentioned above is solved by the following technical solution:

[0016] A gas-fired water heater includes a water heater body, an external flue pipe, an internal flue pipe, and a mounting bracket. The width of the back of the water heater body is greater than the width of the side of the water heater body. An air inlet is provided on the top of the water heater body. The internal flue pipe communicates with the air outlet. The external flue pipe is fixedly sleeved on the internal flue pipe, forming an air intake channel between the external flue pipe and the internal flue pipe. The air intake channel communicates with the air inlet. The external flue pipe includes an external bend, an inserting external pipe, and an external connector. The external bend pipe is connected to the air inlet. The inserting external pipe can pass through a mounting hole opened in the wall. The external connector includes a first connecting part, a reducing part, and a second connecting part. The first connecting part is inserted into the external bend pipe, and the second connecting part is connected to the... The outer tubes are inserted and connected, with the outer diameter of the first connecting part being larger than that of the second connecting part, and the outer diameter of the second connecting part not being larger than the diameter of the mounting hole. The variable diameter part is connected between the first connecting part and the second connecting part, and the outer diameter of the variable diameter part gradually decreases from the end connected to the first connecting part to the end connected to the second connecting part. The mounting bracket is disposed on the water heater body, and the back of the mounting bracket protrudes from or is flush with the back of the water heater body. Let A be the horizontal distance between the axis of the air inlet and the end face of the variable diameter part connected to the second connecting part, and L be the horizontal distance between the axis of the air inlet and the back of the mounting bracket, where A ≤ L.

[0017] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: the external flue pipe can be connected to an external pipe that matches the size of the original mounting hole through a variable-diameter external connector, allowing the external flue pipe to pass through the smaller mounting hole to the outside without the need for hole enlargement, thus improving installation convenience. More importantly, by limiting the distance between the end face of the variable-diameter part of the external connector connected to the second connecting part and the axis of the air inlet of the water heater body, it is ensured that it is no greater than the horizontal distance between the axis of the air inlet and the back of the mounting bracket, i.e., no greater than the horizontal distance between the axis of the air inlet and the wall when the water heater body is installed with a back-mounted air outlet. This ensures that the water heater body does not interfere with the wall in different installation environments, further improving installation convenience.

[0018] In one embodiment, LA ≤ 10 mm.

[0019] In one embodiment, the inner flue includes an inner bend, an inner connector, and an inserting inner tube. The inner bend is disposed within the outer bend, the inner connector is disposed within the outer connector, and the inserting inner tube is disposed within the inserting outer tube. The inner connector includes a connector body, a connector transition portion, and a connector constriction portion. The outer diameter of the connector body is larger than the outer diameter of the connector constriction portion. The connector transition portion connects the connector body and the connector constriction portion, and the outer diameter of the connector transition portion gradually decreases from one end connected to the connector body to the other end.

[0020] In one embodiment, the inserted inner tube includes an inner tube body, an inner tube transition portion, and an inner tube flared portion. The outer diameter of the inner tube body is smaller than the outer diameter of the inner tube flared portion. The inner tube transition portion connects the inner tube body and the inner tube flared portion, and the outer diameter of the inner tube transition portion gradually increases from one end connected to the inner tube body to the other end. The inner tube flared portion is fitted onto the connector constriction portion.

[0021] In one embodiment, the inserted outer tube includes an outer tube body, an outer tube transition portion, and an outer tube flared portion. The outer tube flared portion is inserted into the second connecting portion. The outer diameter of the outer tube flared portion is larger than the outer diameter of the outer tube body. The outer tube transition portion connects the outer tube body and the outer tube flared portion, and the outer diameter of the outer tube transition portion gradually increases from one end connected to the outer tube body to the other end. The radial distance between the inner wall of the inner tube flared portion and the second connecting portion located on the inner side and the outer wall of the inner tube flared portion is C. The maximum distance between the inner wall of the outer tube body and the outer wall of the inner tube body is D, where C=D. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the gas-fired water heater installed on a wall according to Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the gas-fired water heater installed on a wall according to Embodiment 2 of this utility model;

[0024] Figure 3 This is a cross-sectional view of the inner and outer smoke pipes provided in Embodiment 2 of this utility model;

[0025] Figure 4 for Figure 3 Enlarged diagram of point B in the middle.

[0026] Label Explanation:

[0027] 1. Inner flue; 11. Inner bend; 12. Inner connector; 121. Connector body; 122. Connector transition; 123. Connector constriction; 13. Inserted inner pipe; 131. Inner pipe flare; 132. Inner pipe transition; 133. Inner pipe body; 2. Outer flue; 21. Outer bend; 22. Outer connector; 221. First connection; 223. Second connection; 23. Inserted outer pipe; 231. Outer pipe flare; 232. Outer pipe transition; 233. Outer pipe body; 3. Water heater body; 31. Back; 32. Side; 33. Air inlet; 4. Mounting bracket; 5. Wall; 6. Variable diameter section; 7. Bending section; 8. Insertion section. Detailed Implementation

[0028] 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.

[0029] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "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.

[0030] 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.

[0031] 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.

[0032] Example 1

[0033] refer to Figure 1 As shown in the figure, this embodiment proposes a gas-fired water heater, including a water heater body, an external flue pipe, an internal flue pipe, and a mounting bracket 4. The water heater body 3 is generally designed as a cuboid structure. The side walls of the water heater body 3 include a front, a back 31, and a side 32, wherein the width of the back 31 is greater than the width of the side 32. The mounting bracket 4 is disposed on the water heater body 3, and the mounting bracket 4 protrudes from the back 31 of the water heater body 3 or is flush with the back 31 of the water heater body 3. At the same time, the top of the water heater body 3 is coaxially provided with an air inlet 33 and an air outlet. The internal flue pipe is connected to the air outlet, and the external flue pipe is fixedly sleeved on the internal flue pipe and connected to the air inlet. A flue passage connecting to the air outlet is formed inside the internal flue pipe, and an air inlet passage connecting to the air inlet is formed between the external flue pipe and the internal flue pipe. The flue pipe assembly consisting of the internal and external flue pipes is used to discharge the flue gas in the water heater body 3 to the outside and simultaneously draw outdoor air into the water heater body. Of course, the shape of the water heater body 3 is not limited to a cuboid in practical applications. As long as it has a back that can be mounted against a wall, the front can be a single plane or a combination of multiple planes or curved surfaces. The same applies to the sides.

[0034] The external flue includes a bend 7, a reducer 6, and an insertion part 8. The insertion part 8 can pass through a mounting hole in a wall or window. The bend 7 is connected to the air inlet, and the reducer 6 connects the bend 7 and the insertion part 8. The outer diameter of the reducer 6 gradually decreases from the end connected to the bend 7 to the end connected to the insertion part 8. Let a be the horizontal distance between the axis of the air inlet and the end face of the reducer 6 connected to the insertion part 8, and let l be the horizontal distance between the axis of the air inlet and the back of the mounting bracket 4, where a ≤ l.

[0035] In this embodiment, the gas-fired water heater can be installed on the wall 5 or window where the mounting hole is located, either in a back-mounted or side-mounted manner, depending on actual needs, offering high installation convenience. Specifically, a back-mounted unit (31) faces the wall 5 or window where the mounting hole is located, and a side-mounted unit (32) faces the wall 5 or window where the mounting hole is located.

[0036] In this embodiment, the outer diameter of the bend 7 is d1, and the outer diameter of the insertion part 8 is d2, with 1.1 ≤ d1 / d2 ≤ 1.45, so that the outer smoke pipe can maintain a large effective flow area when connected to the air inlet, ensuring air intake efficiency. For example, d1 / d2 = 1.1, d1 / d2 = 1.2, d1 / d2 = 1.3, d1 / d2 = 1.45. When d1 / d2 = 1.45, the air intake efficiency is the highest; when d1 / d2 = 1.1, the manufacturing cost of the outer smoke pipe is the lowest while taking into account air intake efficiency.

[0037] Specifically, la ≤ 10mm. For example, la = 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 9.5mm, so that when the gas water heater is installed on the wall 5 in a back-out manner, the variable diameter part 6 can be set close to the wall, reducing the impact of the change in the diameter of the external flue on the air intake efficiency. The gas water heater has high combustion efficiency, is less likely to produce carbon monoxide, and has high safety performance.

[0038] Specifically, there are two mounting brackets 4, which are respectively located on the upper and lower sides of the back 31 of the water heater body 3, so as to improve the stability of the water heater body 3 when installed on the wall 5 or window where the mounting hole is located.

[0039] Of course, the mounting bracket 4 can also be set on the side, top or back of the water heater body 3.

[0040] Understandably, the value of 'a' primarily depends on the horizontal length of the reducing section 6 and the horizontal extension length of the bend section 7. The horizontal extension length of the bend section 7, in turn, depends on its radius of curvature. A larger radius of curvature in the bend section 7 results in a longer horizontal length and a larger value for 'a'; conversely, a small radius of curvature in the bend section 7 leads to excessively rapid bending, thus affecting air intake resistance. Based on this, considering the thickness of the existing balanced water heater 3, the value of 'l' is not less than 80mm. Therefore, let the radius of curvature of the axis of the bend section 7 be 'r', where 65mm ≤ r < 80mm, for example, r = 65mm, 66mm, 67mm, 68mm, 69mm, 70mm.

[0041] Example 2

[0042] refer to Figures 2-4 As shown, this embodiment proposes a gas-fired water heater, including a water heater body 3, an external flue pipe 2, an internal flue pipe 1, and a mounting bracket 4. The structure of the water heater body 3 and the way the mounting bracket 4 is assembled on the water heater body 3 are the same as in the previous embodiment, and will not be described again here.

[0043] The external flue duct 2 includes an external bend 21, an insert external tube 23, and an external connector 22. The vertically extending end of the external bend 21 is connected to the air inlet 33. The insert external tube 23 can pass through the mounting hole in the wall 5 and is connected to the external bend 21 via the external connector 22. To accommodate the size of the existing mounting hole in the wall 5, the external connector 22 includes a first connecting part 221, a reducing part 6, and a second connecting part 223. The first connecting part 221 is inserted into the horizontally extending end of the external bend 21, and the second connecting part 223 is inserted into the insert external tube 23. The outer diameter of the first connecting part 221 is larger than the outer diameter of the second connecting part 223. The reducing part 6 connects between the first connecting part 221 and the second connecting part 223, and the outer diameter of the reducing part 6 gradually decreases from the end connected to the first connecting part 221 to the end connected to the second connecting part 223. It is worth emphasizing that the outer diameter of the second connecting part 223 is not larger than the diameter of the mounting hole, so that it can be inserted into the mounting hole.

[0044] To ensure that the aforementioned gas-fired water heater can meet different installation requirements, the end face of the variable diameter section 6 connected to the second connecting section 223 on the water heater body 3 must not protrude beyond the water heater body 3 to avoid interference with the wall 5. Based on this, let A be the horizontal distance between the end face of the variable diameter section 6 connected to the second connecting section 223 and the axis of the air inlet 33, and L be the horizontal distance between the axis of the air inlet 33 and the back of the mounting bracket 4, where A ≤ L.

[0045] Therefore, when installing the aforementioned gas-fired water heater, it can be installed according to actual needs. For example, it can be installed against the wall 5 where the mounting hole is located, either as a back-mounted or side-mounted unit, or on another wall 5. Obviously, the direction of the horizontally extending end of the outer bend 21 can be adjusted according to installation requirements; that is, the outer bend 21 can rotate relative to the water heater body 3 before being fixed to it. When the gas-fired water heater is installed against the wall 5 where the mounting hole is located, the back of the mounting bracket 4 is against the wall 5 where the mounting hole is located, and the distance between the air inlet 33 and the wall 5 where the mounting hole is located is the closest. In this case, since A≤L, the reducing part 6 does not interfere with the wall 5. In other installation environments, such as side-mounted or installed on another wall 5, the distance between the air inlet 33 and the wall 5 is further, and the reducing part 6 will not interfere with the wall 5, thus meeting various installation requirements.

[0046] Specifically, based on the mounting hole diameter of 63mm, the outer diameter of the first connecting part is between 70mm and 73mm, and the outer diameter of the second connecting part is between 60mm and 63mm. Thus, the through-tube 23 connected to the second connecting part can maximize its longitudinal cross-sectional area while passing through the mounting hole, thereby improving air intake efficiency. Meanwhile, with the outer diameter of the first connecting part set at 70mm-73mm, the connected outer bend 21 can reduce manufacturing costs while meeting air intake efficiency requirements.

[0047] The radius of curvature of the outer bend 21 is R, which is similar to the bend 7 in the above embodiment, 65mm≤R<80mm, for example, R=65mm, 66mm, 67mm, 68mm, 69mm, 70mm.

[0048] refer to Figure 3 and Figure 4 As shown, the inner flue 1 includes an inner bend 11, an inner connector 12, and an inner through-pipe 13, respectively corresponding to the outer bend 21, the outer connector 22, and the outer through-pipe 23. The inner bend 11 is coaxially disposed within the outer bend 21, the inner connector 12 is coaxially disposed within the outer connector 22, and the inner through-pipe 13 is coaxially disposed within the outer through-pipe 23. The inner bend 11 connects to the gas outlet of the water heater body 3, and the inner connector 12 connects to the inner bend 11 and the inner through-pipe 13. It is understood that the raw material pipes used for processing the inner connector 12, the inner bend 11, and the inner through-pipe 13 are made of the same diameter to reduce the complexity of processing.

[0049] To reduce assembly difficulty, during reprocessing, the outer bend 21 can be fixedly sleeved on the inner bend 11 first, and then the outer bend 21 and the outer connector 22, as well as the inner bend 11 and the inner connector 12 can be fixedly connected. The inserting outer tube 23 can be fixedly sleeved on the inserting inner tube 13, and then the inserting outer tube 23 and the outer connector 22, as well as the inserting inner tube 13 and the inner connector 12 can be connected respectively.

[0050] In one embodiment, one end of the external connector 22 is inserted internally and the other end is sleeved, which is more secure than both ends being inserted internally or both ends being sleeved, thus improving the stability of the external connector 22 connected to the outer bend 21 and the outer tube 23. For example, if the first connecting part 221 is inserted into the outer bend 21, then the second connecting part 223 is sleeved in the outer tube 23; or the first connecting part 221 is sleeved in the outer bend 21, and the second connecting part 223 is inserted into the outer tube 23.

[0051] Similarly, one end of the inner connector 12 is inserted internally, and the other end is sleeved, to improve the stability of the connection between the inner connector 12 and the inner bend 11 and the inner tube 13. For example, one end of the inner connector 12 is sleeved outside the inner bend 11, and the other end is inserted into the inner tube 13. Or, one end of the inner connector 12 is inserted outside the inner bend 11, and the other end is sleeved outside the inner tube 13.

[0052] refer to Figure 4As shown, the first connecting part 221 of the outer connector 22 is inserted into the outer bend 21 and fixedly connected to the outer bend 21 by a bolt that passes vertically through the first connecting part 221 and the outer bend 21. The second connecting part 223 of the outer connector 22 is sleeved on the inserting outer tube 23 and is also fixedly connected to the inserting outer tube 23 by bolts. One end of the inner connector 12 is sleeved on the inner bend 11 and fixedly connected to the inner bend 11 by bolts. The other end of the inner connector 12 is inserted into the extension inner tube and fixedly connected to the inserting inner tube 13 by bolts.

[0053] In order to improve the ease of connection between the inner connector 12 and the inner tube 13, as well as between the inner connector 12 and the inner bend 11, and to improve the sealing of the connection, under the premise that the effective flow area of ​​the exhaust channel remains as unchanged as possible, that is, under the premise that the inner connector 12 and the inner tube 13 have the same diameter, the inner connector 12 or the inner tube 13 is flared or constricted.

[0054] In one embodiment, the inner connector 12 includes a connector body 121, a connector transition portion 122, and a connector constriction portion 123. The outer diameter of the connector body 121 is larger than the outer diameter of the connector constriction portion 123. The connector transition portion 122 connects the connector body 121 and the connector constriction portion 123, and its outer diameter gradually decreases from one end connecting to the connector body 121 to the other end. The connector constriction portion 123 is provided corresponding to the second connecting portion 223. Compared to the inner connector 12 with a constant pipe diameter, the placement of the connector constriction portion 123 reduces the difficulty of connecting with the inner bend pipe 11 and increases the effective flow area of ​​the air intake passage between the connector constriction portion 123 and the second connecting portion 223, which is beneficial to improving air intake efficiency.

[0055] Meanwhile, in order to make the diameter difference between the constricted part 123 of the connector and the inner tube 13 of the insertion tube greater and reduce the difficulty of insertion, the inner tube 13 of the insertion tube includes an inner tube body 133, an inner tube transition part 132 and an inner tube flare part 131. The outer diameter of the inner tube body 133 is smaller than the outer diameter of the inner tube flare part 131. The inner tube transition part 132 is connected between the inner tube body 133 and the inner tube flare part 131, and the outer diameter of the inner tube transition part 132 gradually increases from one end connected to the inner tube body 133 to the other end.

[0056] At this time, the inner bend 11 is inserted into the main body 121 of the connector, and the inner tube 13 is sleeved on the constricted part 123 of the connector. The connector transition part 122 restricts the depth of the inner bend 11 inserted into the inner connector 12 and the depth of the inner connector 12 inserted into the inner tube 13. The inner tube transition part 132 also restricts the depth of the inner connector 12 inserted into the inner tube 13, thus reducing the assembly difficulty.

[0057] Obviously, the inner tube flare 131 affects the effective flow area of ​​the intake channel. To eliminate this effect, the outer tube 23 includes an outer tube body 233, an outer tube transition portion 232, and an outer tube flare 231. The outer diameter of the outer tube flare 231 is larger than the outer diameter of the outer tube body 233. The outer tube transition portion 232 connects the outer tube body 233 and the outer tube flare 231, and the outer diameter of the outer tube transition portion 232 gradually increases from one end connected to the outer tube body 233 to the other end. The outer tube flare 231 is sleeved on the second connecting portion 223, or the outer tube flare 231 is inserted into the second connecting portion 223. The radial distance between the inner wall of the inner tube flare 231 and the outer wall of the inner tube flare 131 is C, and the maximum distance between the inner wall of the outer tube body 233 and the outer wall of the inner tube body 133 is D, where C=D. At this time, the gas flows smoothly in the intake channel, improving the intake efficiency.

[0058] refer to Figure 4 As shown, in order to reduce the difficulty of connecting the inner connector 12 and the inner tube 13, one end of the inner connector 12 that connects to the inner tube 13 protrudes out of the outer connector 22. And in order to reduce the difficulty of connecting the inner bend 11 and the inner connector 12, one end of the inner bend 11 that connects to the inner connector 12 protrudes out of the outer bend 21.

[0059] 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.

[0060] 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 gas-fired hot water equipment, characterized in that, include: The water heater body (3) has a back (31) width greater than the side (32) width of the water heater body (3), and the top of the water heater body (3) is provided with an air inlet (33) and an air outlet. An inner smoke pipe, which is connected to the air outlet; An outer smoke pipe is fixedly sleeved on the inner smoke pipe. An air intake channel is formed between the outer smoke pipe and the inner smoke pipe. The air intake channel is connected to the air inlet. The outer smoke pipe includes a bent pipe section (7), a variable diameter section (6), and an insertion section (8). The insertion section (8) can pass through an installation hole opened on a wall (5) or window. The bent pipe section (7) is connected to the air inlet (33). The variable diameter section (6) is connected between the bent pipe section (7) and the insertion section (8). The outer diameter of the variable diameter section (6) gradually decreases from the end connected to the bent pipe section (7) to the end connected to the insertion section (8). Mounting bracket (4) is provided on the water heater body (3), and the back of the mounting bracket (4) protrudes from the back of the water heater body (3) or is flush with the back of the water heater body (3). Let a be the horizontal distance between the axis of the air inlet (33) and the end face of the variable diameter part (6) connected to the insertion part (8), and l be the horizontal distance between the axis of the air inlet (33) and the back of the mounting bracket (4), where a ≤ l.

2. The gas-fired water heater according to claim 1, characterized in that, it is provided with The outer diameter of the bent section (7) is d1, and the outer diameter of the insertion section (8) is d2, 1.1≤d1 / d2≤1.

45.

3. The gas-fired hot water equipment according to claim 1, characterized in that, la≤10mm.

4. The gas-fired hot water equipment according to claim 1, characterized in that, The radius of curvature of the axis of the bent section (7) is r, 65mm≤r<80mm.

5. The gas-fired hot water equipment according to any one of claims 1-4, characterized in that, There are two mounting brackets (4), which are respectively located on the upper and lower sides of the back of the water heater body (3).

6. A gas-fired hot water equipment, characterized in that, include: The water heater body (3) has a back (31) width greater than the side (32) width of the water heater body (3), and the top of the water heater body (3) is provided with an air inlet (33) and an air outlet. An outer smoke pipe (2) and an inner smoke pipe (1) are provided. The outer smoke pipe (2) is fitted onto the inner smoke pipe (1). An air intake channel is formed between the outer smoke pipe (2) and the inner smoke pipe (1). The air intake channel is connected to the air inlet. The inner smoke pipe (1) is connected to the air outlet. The outer smoke pipe (2) includes an outer bend (21), an insert outer pipe (23), and an outer connector (22). The outer bend (21) is connected to the air inlet (33). The insert outer pipe (23) can pass through an installation hole opened in a wall (5) or window. The outer connector (22) includes a first connecting part (221), a reducing part (6), and a second connecting part. The first connecting part (221) is inserted into the outer bend (21), and the second connecting part (223) is inserted into the through outer tube (23). The outer diameter of the first connecting part (221) is larger than the outer diameter of the second connecting part (223), and the outer diameter of the second connecting part (223) is not larger than the diameter of the mounting hole. The variable diameter part (6) is connected between the first connecting part (221) and the second connecting part (223), and the outer diameter of the variable diameter part (6) gradually decreases from the end connected to the first connecting part (221) to the end connected to the second connecting part (223). Mounting bracket (4) is provided on the water heater body (3), and the mounting bracket (4) protrudes from the back of the water heater body (3) or is flush with the back of the water heater body (3). Let A be the horizontal distance between the axis of the air inlet (33) and the end face of the variable diameter part (6) connected to the second connecting part (223), and L be the horizontal distance between the axis of the air inlet (33) and the back of the mounting bracket (4), where A≤L.

7. The gas-fired hot water equipment according to claim 6, characterized in that, LA≤10mm.

8. The gas-fired hot water equipment according to claim 6, characterized in that, The inner smoke pipe (1) includes an inner bend (11), an inner connector (12), and an insert inner pipe (13). The inner bend (11) is located inside the outer bend (21), the inner connector (12) is located inside the outer connector (22), and the insert inner pipe (13) is located inside the insert outer pipe (23). The inner connector (12) includes a connector body (121), a connector transition (122), and a connector constriction (123). The outer diameter of the connector body (121) is larger than the outer diameter of the connector constriction (123). The connector transition (122) connects the connector body (121) and the connector constriction (123), and the outer diameter of the connector transition (122) gradually decreases from one end connected to the connector body (121) to the other end.

9. The gas-fired hot water equipment according to claim 8, characterized in that, The inserted inner tube (13) includes an inner tube body (133), an inner tube transition part (132), and an inner tube flare part (131). The outer diameter of the inner tube body (133) is smaller than the outer diameter of the inner tube flare part (131). The inner tube transition part (132) is connected between the inner tube body (133) and the inner tube flare part (131). The outer diameter of the inner tube transition part (132) gradually increases from one end connected to the inner tube body (133) to the other end. The inner tube flare part (131) is fitted onto the connector constriction part (123).

10. The gas-fired hot water equipment according to claim 9, characterized in that, The inserted outer tube (23) includes an outer tube body (233), an outer tube transition portion (232), and an outer tube flared portion (231). The outer tube flared portion (231) is inserted into the second connecting portion (223). The outer diameter of the outer tube flared portion (231) is larger than the outer diameter of the outer tube body (233). The outer tube transition portion (232) is connected to the outer tube body (233) and the outer tube flared portion (231). The outer diameter of the outer tube transition portion (232) gradually increases from one end connected to the outer tube body (233) to the other end. The radial distance between the inner wall of the inner tube flare (231) and the outer wall of the inner tube flare (131) is C, and the maximum distance between the inner wall of the outer tube body (233) and the outer wall of the inner tube body (133) is D, where C=D.

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