CN111692757B - Air duct assembly, heat exchange structure and gas water heater - Google Patents

Abstract

The invention discloses an air duct assembly, a heat exchange structure and a gas water heater, wherein the air duct assembly comprises a shell and an auxiliary piece, a mounting part for mounting the heat exchange assembly is arranged in the shell, the shell is provided with an air inlet duct and an air outlet duct, the air inlet duct and the air outlet duct are arranged on two sides of the mounting part, a circulating pipeline is arranged in the auxiliary piece, the circulating pipeline is communicated with the air inlet duct and the air outlet duct, and the circulating pipeline is used for guiding airflow in the air outlet duct into the air inlet duct. The circulating pipeline can guide the air flow in the air outlet channel into the air inlet channel again, so that the hot air with reduced temperature in the air outlet channel can be subjected to heat exchange by the heat exchange assembly again, the heat loss caused by direct discharge of the hot air in the air outlet channel can be prevented, the heat input can be increased, the air channel assembly can improve the heat efficiency under the condition of only utilizing one heat exchange assembly, and the effect of improving the heat efficiency while ensuring the economical efficiency is realized.

Description

Air duct assembly, heat exchange structure and gas water heater

Technical Field

The invention relates to the technical field of heat exchange equipment, in particular to an air duct assembly, a heat exchange structure and a gas water heater.

Background

Traditional gas heater can be divided into noncondensor and condensing engine according to the flue gas exhaust state, and the heat exchanger of noncondensor only has the one-level, and the high temperature flue gas keeps the gaseous state after the heat exchanger to get rid of from the tobacco pipe, and the flue gas still contains more heat this moment, so the energy utilization of this kind of model is lower, and is great to the pollution of environment moreover. In order to better utilize the waste heat of the flue gas, people develop a condenser, the principle is to utilize two heat exchangers to carry out secondary heat exchange on the flue gas, and the heat of the high-temperature flue gas is greatly absorbed after the high-temperature flue gas passes through the two heat exchangers, so that the water vapor in the flue gas is condensed to form condensed water. However, this kind of gas water heater uses two heat exchangers, and the design also needs to consider discharging the condensed water out of the machine, resulting in higher cost and undesirable economy.

Disclosure of Invention

Based on the above, the invention aims to overcome the defects of the prior art and provides the air duct assembly, the heat exchange structure and the gas water heater which have better economical efficiency and can improve the heat efficiency.

The technical scheme is as follows:

the utility model provides an air duct assembly, includes casing and auxiliary member, be equipped with the installation department that is used for installing heat exchange assemblies in the casing, the casing is equipped with air inlet duct and exhaust duct, the air inlet duct reaches the exhaust duct is located the both sides of installation department, be equipped with circulation pipeline in the auxiliary member, circulation pipeline intercommunication the air inlet duct reaches the exhaust duct, circulation pipeline be used for with air current in the exhaust duct is leading-in the air inlet duct.

Above-mentioned wind channel subassembly, can install heat exchange assembly in installation department, and let in hot-blastly by air inlet duct department, hot-blastly can carry out the heat transfer through heat exchange assembly department, hot-blastly heat can lose a part and enter into the air outlet duct this moment, and circulation pipeline can be with the air current in the air outlet duct reintroduction air inlet duct, make the hot-blastly of the interior temperature decline of air outlet duct carry out the heat transfer by heat exchange assembly again, consequently, can prevent the heat loss that the hot-blastly direct discharge in the air outlet duct leads to, multiplicable heat input, therefore above-mentioned wind channel subassembly can improve the thermal efficiency under the condition that only utilizes a heat exchange assembly, the effect of improving the thermal efficiency when having realized guaranteeing economic nature.

In one embodiment, the auxiliary member includes an inlet end communicated with the air outlet duct, and an included angle between an opening direction of the inlet end and a flowing direction of air in the air outlet duct is greater than or equal to 90 degrees and less than or equal to 180 degrees.

In one embodiment, an included angle between the air inlet direction of the inlet end and the flowing direction of the air in the air outlet channel is smaller than or equal to 90 °.

In one embodiment, the inlet end part extends into the air outlet channel, and the end surface of the inlet end is obliquely arranged relative to the air inlet direction of the inlet end.

In one embodiment, the auxiliary member includes an outlet end communicated with the air inlet duct, and an included angle between an air outlet direction of the outlet end and an air inlet direction of the air inlet duct is smaller than or equal to 90 °.

In one embodiment, the end surface of the outlet end is flush with the inner wall of the air inlet duct.

In one embodiment, one end of the air inlet duct close to the mounting portion is a guide end, the inner diameter of the guide end is gradually reduced along the direction close to the mounting portion, and the outlet end is communicated with the guide end.

In one embodiment, the auxiliary member includes a first plug, a second plug and a middle portion, the first plug and the second plug are connected to the casing, the first plug is the inlet end, the first plug is communicated with the air outlet duct, the first plug is arranged along a downward direction of inclination relative to an inner wall of the air outlet duct, the second plug is the outlet end, the second plug is communicated with the air inlet duct, the second plug is arranged along an upward direction of inclination relative to an inner wall of the air inlet duct, and two ends of the middle portion are respectively plugged with the first plug and the second plug.

In one of them embodiment, above-mentioned wind channel subassembly still includes the draught fan, the draught fan with circulation pipeline intercommunication, the draught fan is used for making circulation pipeline will the air current in the air outlet duct is leading-in the air inlet duct.

A heat exchange structure comprises a heat exchange assembly and an air duct assembly, wherein the air duct assembly is arranged on the mounting portion.

Above-mentioned heat exchange structure, let in hot-blastly by air inlet duct department, hot-blastly can carry out the heat transfer through heat exchange assembly department, hot-blastly heat can lose partly and enter the air outlet duct this moment, and circulation line can be with the air current in the air outlet duct reintroduction air inlet duct, make the hot-blastly of the interior temperature decline of air outlet duct carry out the heat transfer by heat exchange assembly again, consequently, can prevent the heat loss that the hot-blastly direct discharge in the air outlet duct leads to, multiplicable heat input, consequently above-mentioned heat exchange structure can improve the thermal efficiency under the condition that only utilizes a heat exchange assembly, the effect of improving the thermal efficiency when having realized guaranteeing economic nature.

In one embodiment, the heat exchange assembly comprises a plurality of heat exchange fins and a heat exchange tube, the heat exchange fins are arranged at intervals to form heat exchange gaps, the heat exchange gaps are respectively communicated with the air outlet duct and the air inlet duct, and the heat exchange tube penetrates through the heat exchange fins.

The utility model provides a gas water heater, includes combustor, fan and as above arbitrary the heat exchange structure, the combustor is located the air inlet duct is kept away from heat exchange assemblies's one side, the fan is located in the air outlet duct.

Above-mentioned gas heater, combustor accessible burning forms the high temperature flue gas, under the suction effect of self thermal expansion and fan, the high temperature flue gas passes through heat exchange assembly and carries out the heat exchange, the high temperature flue gas after the heat exchange gets into in the exhaust passage, the flue gas still has more heat this moment, circulation pipeline can be with the flue gas after the heat exchange by exhaust passage reintroduction inlet duct, make still have thermal flue gas and carry out the heat exchange again, heat input has been increased, then above-mentioned gas heater can realize the twice heat exchange of high temperature flue gas under the condition that utilizes a heat exchange assembly, the economic nature that has better when having improved whole thermal efficiency.

In one embodiment, the inner wall of the air outlet channel is arranged around the fan to form an annular air channel around the fan, and the communication position of the auxiliary part and the air outlet channel is located at one end, close to the heat exchange assembly, of the air outlet channel.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a gas fired hydrothermal reactor according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is a schematic view of an angle between the opening direction of the inlet end in FIG. 2 and the flow direction of the wind in the air outlet duct;

FIG. 4 is a schematic view of an angle between the air inlet direction in FIG. 2 and the flow direction of the air in the air outlet duct;

FIG. 5 is an enlarged schematic view at B of FIG. 1;

fig. 6 is a schematic view of an included angle between an air outlet direction of the outlet end and an air inlet direction of the air inlet duct in fig. 5.

Description of reference numerals:

100. the heat exchanger comprises a shell, 101, a mounting part, 102, an air inlet channel, 102a, a guide end, 103, an air outlet channel, 110, a first branch part, 120, a second branch part, 200, an auxiliary part, 201, a circulating pipeline, 210, an inlet end, 220, an outlet end, 230, an intermediate part, 300, a heat exchange assembly, 310, heat exchange fins, 320, a heat exchange pipe, 400, a combustor, 500 and a fan.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1, an embodiment discloses an air duct assembly, including casing 100 and auxiliary member 200, be equipped with installation department 101 that is used for installing heat exchange assembly 300 in the casing 100, casing 100 is equipped with air inlet duct 102 and exhaust duct 103, air inlet duct 102 reaches exhaust duct 103 locates the both sides of installation department 101, be equipped with circulation pipeline 201 in the auxiliary member 200, circulation pipeline 201 intercommunication air inlet duct 102 reach exhaust duct 103, circulation pipeline 201 is used for with the air current of exhaust duct 103 is leading-in the air inlet duct 102.

The air duct assembly can be provided with the heat exchange assembly 300 at the mounting part 101, hot air is introduced from the air inlet duct 102, the hot air can exchange heat through the heat exchange assembly 300, at the moment, part of heat of the hot air can be lost and enters the air outlet duct 103, the circulating pipeline 201 can guide air flow in the air outlet duct 103 into the air inlet duct 102 again, the hot air with reduced temperature in the air outlet duct 103 can exchange heat through the heat exchange assembly 300 again, therefore, heat loss caused by direct discharge of the hot air in the air outlet duct 103 can be prevented, heat input can be increased, the air duct assembly can improve the heat efficiency under the condition that only one heat exchange assembly 300 is utilized, and the effect of improving the heat efficiency while the economy is ensured is realized.

Optionally, the auxiliary 200 is a hot-galvanized plate, which has a good corrosion prevention effect, and can prevent water vapor and the like carried in hot air from corroding the auxiliary 200 or rusting the auxiliary 200, thereby prolonging the service life of the auxiliary 200. In other embodiments, the auxiliary member 200 may be made of other high temperature and corrosion resistant materials, or a high temperature and corrosion resistant coating may be coated on the inner wall of the circulation line 201.

Optionally, the heat insulation member is sleeved outside the auxiliary member 200 to prevent heat loss of the auxiliary member 200 during the process of re-introducing the hot wind into the air inlet duct 102, thereby improving thermal efficiency. In other embodiments, the auxiliary element 200 itself may also be an insulating material.

Alternatively, the cross section of the circulation line 201 may be a circular section, a polygonal section, or the like.

In one embodiment, as shown in fig. 2 and 3, the auxiliary member 200 includes an inlet end 210 communicated with the air outlet duct 103, and an included angle between an opening direction of the inlet end 210 and a flowing direction of wind in the air outlet duct 103 is greater than or equal to 90 ° and less than or equal to 180 °. At this time, the opening direction of the inlet end 210 can face the flowing direction of the wind in the wind outlet channel 103, so that the opening of the inlet end 210 is in a positive pressure state under the action of the wind in the wind outlet channel 103, and the wind in the wind outlet channel 103 can enter the circulating pipeline 201 and be guided into the wind inlet channel 102 under the action of the positive pressure.

Specifically, as shown in fig. 2 and 3, the opening direction of the inlet end 210 is a, the flow direction of the wind in the air outlet channel 103 is b, and the included angle between the opening direction a of the inlet end 210 and the flow direction b of the wind in the air outlet channel 103 is c, and 180 ° ≧ c ≧ 90 °.

In one embodiment, as shown in fig. 2 and 4, an angle between the air inlet direction of the inlet end 210 and the flow direction of the air in the air outlet duct 103 is less than or equal to 90 °. At this time, when the wind in the air outlet channel 103 enters the inlet end 210, the direction of the wind flowing in the inlet end 210 is the same as or similar to the direction of the wind flowing in the air outlet channel 103, which is beneficial to the flow of the wind in the circulation pipeline 201.

Specifically, as shown in fig. 2 and 4, the air inlet direction of the inlet end 210 is d, the angle between the air inlet direction d of the inlet end 210 and the flow direction b of the wind in the air outlet channel 103 is e, and 90 ° ≧ e.

Specifically, as shown in fig. 2 to 4, the air inlet direction d and the opening direction a of the inlet end 210 are two different concepts, the first end of the circulation pipeline 201 is located in the inlet end 210, the direction of the wind flowing in the first end is the air inlet direction d, the opening direction a of the inlet end 210 is actually the direction of the plane where the opening of the circulation pipeline 201 is located, when the end surfaces of the inlet end 210 are located on the same plane, the opening direction a of the inlet end 210 is actually the normal direction of the end surface of the inlet end 210, and the normal direction is set in the direction away from the auxiliary element 200.

In one embodiment, as shown in fig. 2 and 4, an end surface of the inlet end 210 is disposed obliquely with respect to an air inlet direction of the inlet end 210. Since it is necessary to consider guiding the wind from the outlet duct 103 to the inlet duct 102, the wind inlet direction of the inlet end 210 is inclined with respect to the end surface of the inlet end 210, which is beneficial to guiding the wind into the inlet duct 102 along the circulation path 201 more smoothly.

Specifically, as shown in fig. 2 and 4, an angle between the end surface of the inlet end 210 and the air inlet direction of the inlet end 210 ranges from 0 ° to 90 °. At this time, the wind in the wind outlet channel 103 is less obstructed when entering the inlet end 210, and can more smoothly enter the wind inlet channel 102 from the wind outlet channel 103.

In one embodiment, as shown in fig. 5 and 6, the auxiliary member 200 includes an outlet end 220 communicated with the air inlet duct 102, and an included angle between an air outlet direction of the outlet end 220 and an air inlet direction of the air inlet duct 102 is less than or equal to 90 °. At this time, when the air in the circulation pipeline 201 is guided out from the outlet end 220, the air is close to the air inlet direction in the air inlet duct 102, so that the outlet end 220 is in a negative pressure state, a pressure difference is formed between the outlet end 220 and the inlet end 210, and the air in the air inlet duct 102 does not obstruct the guiding out of the air in the circulation pipeline 201, therefore, the hot air in the air outlet duct 103 can return to the air inlet duct 102 without other power, and further, the heat exchange component 300 performs heat exchange again.

Specifically, as shown in fig. 5 and fig. 6, the air outlet direction of the outlet end 220 is f, the air inlet direction of the air inlet duct 102 is g, an included angle between the air outlet direction f of the outlet end 220 and the air inlet direction g of the air inlet duct 102 is h, and 90 ° ≧ h.

In one embodiment, as shown in fig. 5, the end surface of the outlet end 220 is flush with the inner wall of the air inlet duct 102. The outlet end 220 does not obstruct the flow of air in the air inlet duct 102.

In one embodiment, as shown in fig. 5 and 6, one end of the air inlet duct 102 close to the mounting portion 101 is a leading end 102a, an inner diameter of the leading end 102a gradually decreases along a direction close to the mounting portion 101, and the outlet end 220 is communicated with the leading end 102 a. By providing the leading end 102a having an inner diameter gradually decreasing in a direction close to the mounting portion 101, the air in the air intake duct 102 can be guided and concentrated, and the flow rate of the air in the air intake duct 102 can be increased, which is advantageous for maintaining the outlet end 220 in a negative pressure state and promoting the flow of the air in the circulation pipe 201. In addition, because the inner wall of leading end 102a is the slope setting for the vertical at this moment, the angle of connection of exit end 220 and leading end 102a also can corresponding adjustment, makes the direction of arrangement of exit end 220 set up towards oblique top, is favorable to increasing the contained angle between exit end 220 and the entry end 210, makes hot-blast change corner when flowing in circulating line 201 more, and then makes the flow of hot-blast more smooth and easy.

Specifically, when the angle between the outlet end 220 and the leading end 102a is smaller, the angle of change in the wind direction when the hot wind passes through the corner in the circulation pipe 201 is larger, and thus increasing the angle between the outlet end 220 and the inlet end 210 enables the hot wind to undergo a smaller change in the wind direction when passing through the corner, and thus the obstruction to the flow of the wind can be reduced.

Specifically, the end surface of the outlet end 220 is flush with the inner wall of the leading end 102a, and since the wind in the air inlet duct 102 is guided by the inner wall of the leading end 102a, for the outlet end 220, the air inlet direction of the air inlet duct 102 related to the outlet end 220 is actually parallel to the inner wall of the leading end 102a, and the included angle between the air outlet direction of the outlet end 220 and the air inlet direction of the air inlet duct 102 is also actually the included angle between the air outlet direction of the outlet end 220 and the inner wall of the leading end 102 a.

In one embodiment, as shown in fig. 1, 2 and 5, the auxiliary member 200 includes a first plug, a second plug and a middle portion 230, the first plug and the second plug are both disposed on the housing 100, the first plug is the inlet end 210, the first plug is communicated with the air outlet duct 103, the first plug is disposed along an oblique downward direction relative to an inner wall of the air outlet duct 103, the second plug is the outlet end 220, the second plug is communicated with the air inlet duct 102, the second plug is disposed along an oblique upward direction relative to an inner wall of the air inlet duct 102, and two ends of the middle portion 230 are respectively plugged with the first plug and the second plug. The manufacture of the housing 100 and the connection with the auxiliary member 200 are facilitated, and the assembly of the gas water heater is facilitated.

Optionally, as shown in fig. 1, the middle portion 230 is disposed at an included angle with the inlet end 210 and the outlet end 220, an end of the middle portion 230 connected with the inlet end 210 is a rounded corner structure, and an end of the middle portion 230 connected with the outlet end 220 is a rounded corner structure. The fillet structure is better to the direction effect of wind, makes hot-blast more smooth and easy that flows in circulation pipeline 201.

In one embodiment, the air duct assembly further includes an induced draft fan 500, and the induced draft fan 500 is configured to enable the circulation pipeline 201 to guide the air flow in the air outlet duct 103 into the air inlet duct 102. Through setting up draught fan 500, can be better with hot-blast back to the air inlet duct 102 in by the exhaust duct 103 to the thermal efficiency is improved.

As shown in fig. 1, an embodiment discloses a heat exchange structure, which includes a heat exchange assembly 300 and the air duct assembly, where the heat exchange assembly 300 is disposed on the mounting portion 101.

Above-mentioned heat exchange structure, let in hot-blast by air inlet duct 102 department, hot-blast can carry out the heat transfer through heat exchange assembly 300 department, the heat of hot-blast this moment can lose a part and get into the exhaust duct 103, and circulation line 201 can be with leading-in air current in the exhaust duct 103 in the air inlet duct 102 again, make the hot-blast of the decline of temperature in the exhaust duct 103 can carry out the heat transfer by heat exchange assembly 300 again, consequently, can prevent the heat loss that the direct discharge of hot-blast in the exhaust duct 103 leads to, multiplicable heat input, therefore above-mentioned heat exchange structure can improve the thermal efficiency under the condition that only utilizes heat exchange assembly 300, the effect of improving the thermal efficiency when having realized guaranteeing economic nature.

In one embodiment, as shown in fig. 1, the heat exchange assembly 300 includes a plurality of heat exchange fins 310 and a heat exchange tube 320, the heat exchange fins 310 are arranged at intervals to form heat exchange gaps, the heat exchange gaps are respectively communicated with the air outlet duct 103 and the air inlet duct 102, and the heat exchange tube 320 penetrates through the heat exchange fins 310. When hot air enters the heat exchange gap from the air inlet duct 102, part of heat in the hot air heats the heat exchange fins 310, the heat exchange fins 310 can conduct the heat to the heat exchange tube 320 to heat the heat exchange tube 320, then the hot air losing part of the heat enters the air inlet duct 102, the hot air in the air inlet duct 102 still has heat, enters the air inlet duct 102 again through the circulating pipeline 201, can be mixed with the original hot air in the air inlet duct 102 to carry out secondary heat exchange, and can improve the heat efficiency.

In this embodiment, the heat exchange assembly 300 is actually a finned heat exchanger, and in other embodiments, the heat exchange assembly 300 may also be another type of heat exchanger, such as a plate heat exchanger.

As shown in fig. 1, an embodiment discloses a gas water heater, which includes a burner 400, a fan 500 and the heat exchange structure as described above, wherein the burner 400 is disposed on one side of the air inlet duct 102 away from the heat exchange assembly 300, and the fan 500 is disposed in the air outlet duct 103.

Above-mentioned gas heater, combustor 400 accessible burning forms the high temperature flue gas, under the suction effect of self thermal expansion and fan 500, the high temperature flue gas is through heat exchange assembly 300 and carries out the heat exchange, the high temperature flue gas after the heat exchange gets into in the exhaust passage 103, the flue gas still has more heat this moment, circulation pipeline 201 can be with the flue gas after the heat exchange reintroduced air inlet duct 102 by exhaust passage 103, make the flue gas that still has the heat carry out the heat exchange again, heat input has been increased, then above-mentioned gas heater can realize the twice heat exchange of high temperature flue gas under the condition that utilizes a heat exchange assembly, have better economic nature when having improved whole thermal efficiency.

In addition, after the flue gas reenters the air inlet duct 102 through the circulating pipeline 201, heat exchange can be generated between the flue gas and high-temperature flue gas in the air inlet duct 102, the flue gas is heated, the temperature of the flue gas is increased, even if the flue gas is subjected to heat exchange again, condensed water can not be generated, the discharged condensed water does not need to be considered, and the structure of the gas water heater is simpler.

Specifically, the included angle between the opening direction of the inlet end 210 and the flowing direction of the wind in the wind outlet channel 103 is greater than or equal to 90 degrees and less than or equal to 180 degrees, the included angle between the wind inlet direction of the inlet end 210 and the flowing direction of the wind in the wind outlet channel 103 is less than or equal to 90 degrees, and the included angle between the wind outlet direction of the outlet end 220 and the wind inlet direction of the wind inlet channel 102 is less than or equal to 90 degrees. At this time, a larger pressure difference can be formed at the inlet end 210 and the outlet end 220 under the action of the fan 500, and the fan is matched with the specific structure of the auxiliary element 200, so that the effect of better realizing that high-temperature flue gas enters the air inlet duct 102 again from the circulating pipeline 201 after primary heat exchange and performs heat exchange again is achieved.

In one embodiment, as shown in fig. 1, the inner wall of the air outlet channel 103 is disposed around the fan 500 and forms an annular air channel around the fan 500, and the communication position between the auxiliary member 200 and the air outlet channel 103 is located at one end of the air outlet channel 103 close to the heat exchange assembly 300. Under fan 500's suction effect, the heat transfer that high temperature flue gas process heat exchange assembly 300 gets into out wind 103, the heat that has when so high temperature flue gas just left heat exchange assembly 300's region is more, along with high temperature flue gas flows along out wind 103, heat in the high temperature flue gas can scatter and disappear, consequently set up the one end that is close to heat exchange assembly 300 at out wind 103 with the intercommunication department of auxiliary member 200 and out wind 103, can be with having more thermal high temperature flue gas reintroduction air inlet duct 102 in, can further improve the thermal efficiency.

Specifically, fan 500 is centrifugal fan 500, and centrifugal fan 500 can improve convulsions and air supply effect with the shape cooperation in above-mentioned annular wind channel.

Specifically, as shown in fig. 2, since the fan 500 is a centrifugal fan, the fan 500 pushes the high-temperature flue gas passing through the heat exchange assembly 300 to the inner wall of the air outlet duct 103 by the fan 500, and the flowing direction of the air in the air outlet duct 103 is substantially perpendicular to the tangential direction of the inner wall of the air outlet duct 103.

In other embodiments, the air outlet channel 103 may also be arranged along a straight line, and the flow direction of the air in the air outlet channel 103 is parallel to the inner wall of the air outlet channel 103.

Optionally, as shown in fig. 1, the housing 100 includes a second part 110 and a second part 120, the second part 110 is detachably connected to the second part 120, the mounting portion 101 and the air inlet duct 102 are both located in the second part 110, one end of the auxiliary 200 is detachably connected to the second part 110, the air outlet duct 103 is located in the second part 120, and the other end of the auxiliary 200 is connected to the second part 120. At this time, the auxiliary 200 may be connected to the second section 120, and then the second section 110 may be connected to the second section 120, and the auxiliary 200 may be connected to the second section 110, so as to assemble the gas water heater. In other embodiments, the housing 100 may be a unitary structure.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (11)

1. The utility model provides an air duct assembly, a serial communication port, includes casing and auxiliary member, be equipped with the installation department that is used for installing heat exchange component in the casing, the casing is equipped with air inlet duct and exhaust duct, the air inlet duct reaches the exhaust duct is located the both sides of installation department, be equipped with circulation pipeline in the auxiliary member, circulation pipeline intercommunication the air inlet duct reaches the exhaust duct, circulation pipeline be used for with airflow in the exhaust duct is leading-in the air inlet duct, the auxiliary member include with the entry end of exhaust duct intercommunication, the opening direction of entry end with the contained angle of the flow direction of wind is greater than or equal to 90 and less than or equal to 180 in the exhaust duct, the auxiliary member include with the exit end of air inlet duct intercommunication, the air-out direction of exit end with the contained angle of the air inlet direction of air inlet duct is less than or equal to 90.

2. The air duct assembly according to claim 1, wherein an angle between an air inlet direction of the inlet end and a flow direction of air in the air outlet duct is less than or equal to 90 °.

3. The air duct assembly according to claim 2, wherein the inlet end portion extends into the air outlet duct, and an end surface of the inlet end is disposed obliquely with respect to an air inlet direction of the inlet end.

4. The air duct assembly according to claim 1, wherein an end surface of the outlet end is disposed flush with an inner wall of the air inlet duct.

5. The air duct assembly according to claim 4, wherein an end of the air inlet duct adjacent to the mounting portion is a leading end, an inner diameter of the leading end is gradually reduced in a direction adjacent to the mounting portion, and the outlet end is communicated with the leading end.

6. The air duct assembly according to claim 1, wherein the auxiliary member includes a first plug, a second plug and an intermediate portion, the first plug and the second plug are both connected to the housing, the first plug is the inlet end, the first plug is communicated with the air outlet duct, the first plug is disposed in an oblique downward direction with respect to an inner wall of the air outlet duct, the second plug is the outlet end, the second plug is communicated with the air inlet duct, the second plug is disposed in an oblique upward direction with respect to an inner wall of the air inlet duct, and two ends of the intermediate portion are respectively plugged with the first plug and the second plug.

7. The air duct assembly according to claim 1, further comprising an induced draft fan, wherein the induced draft fan is communicated with the circulation pipeline, and the induced draft fan is used for leading the air flow in the air outlet duct into the air inlet duct through the circulation pipeline.

8. A heat exchange structure comprising a heat exchange assembly and an air duct assembly as claimed in any one of claims 1 to 7, the heat exchange assembly being provided to the mounting portion.

9. The heat exchange structure according to claim 8, wherein the heat exchange assembly comprises a plurality of heat exchange fins and a heat exchange tube, the heat exchange fins are arranged at intervals to form heat exchange gaps, the heat exchange gaps are respectively communicated with the air outlet duct and the air inlet duct, and the heat exchange tube penetrates through the heat exchange fins.

10. A gas water heater, characterized by, including combustor, fan and according to any one of claims 8-9 heat exchange structure, the combustor is located the air inlet duct one side of keeping away from heat exchange assembly, the fan is located in the exhaust duct.

11. The gas water heater of claim 10, wherein the inner wall of the air outlet channel is disposed around the fan to form an annular air channel around the fan, and the communication between the auxiliary member and the air outlet channel is located at one end of the air outlet channel close to the heat exchange assembly.

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