CN209801816U - air supply and exhaust device and heating equipment with same - Google Patents

Abstract

The utility model relates to a give exhaust apparatus and be equipped with its equipment of heating includes for exhaust apparatus: the main body section is provided with a first exhaust channel and a first air inlet channel; the connecting section is connected to one end of the extending section and provided with a second exhaust channel and a second air inlet channel, the second exhaust channel is communicated with the first exhaust channel, and the second air inlet channel is communicated with the first air inlet channel; the extension section is connected to one end, far away from the extension section, of the connecting section and comprises a third exhaust channel, and the third exhaust channel is communicated with the second exhaust channel; the connecting section is provided with an air inlet communicated with the second air inlet channel and the external environment, and the air inlet and the air outlet are separated by a preset distance. The arrangement of the extension section in the air supply and exhaust device enables a certain distance to be reserved between the air exhaust port and the air inlet, so that potential safety hazards caused by ice columns formed on the air inlet are avoided, meanwhile, the backflow of condensed water is avoided, and smoke exhausted from the air exhaust port can be prevented from returning through the air inlet to participate in combustion again.

Description

Air supply and exhaust device and heating equipment with same

Technical Field

the utility model relates to a heat exchange equipment field especially relates to a give exhaust apparatus and be equipped with its equipment of heating.

Background

Heating equipment such as gas heating water heater heats media such as water through gas combustion heat production, consequently is provided with usually for exhaust apparatus in order to provide oxygen for the burning for acquireing the outside air, can discharge the flue gas that the burning produced to external environment simultaneously.

However, at present, due to the structural defects of the air supply and exhaust device, the smoke at the smoke outlet easily flows back to the air inlet, when the external environment temperature is low, the high-temperature smoke is easily condensed into condensed water at the air inlet, and the condensed water is further frozen to form icicles in the low-temperature environment. When the environmental temperature rises, the icicles melt into water and then flow into the heating equipment from the air inlet, so that the problems of corrosion of internal parts of the heating equipment and the like are caused. In addition, the flue gas easily reenters the heating equipment after flowing back to the air inlet and participates in the combustion, thereby causing the problems of insufficient combustion and the like and influencing the heating function of the heating equipment.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an air supply and exhaust device and a heating apparatus provided with the same, which can prevent the formation of icicles at the air inlet and the backflow of flue gas, in order to solve the problems that icicles are easily formed at the air inlet of the air supply and exhaust device and the backflow of flue gas is easily generated.

an air supply and exhaust device, comprising:

The main body section comprises a first exhaust channel and a first air inlet channel surrounding the first exhaust channel;

The connecting section is connected to one end of the main body section and comprises a second exhaust channel and a second air inlet channel surrounding the second exhaust channel, the second exhaust channel is communicated with the first exhaust channel, and the second air inlet channel is communicated with the first air inlet channel; and

The extension section is connected to one end, far away from the main body section, of the connecting section and comprises a third exhaust channel, and the third exhaust channel is communicated with the second exhaust channel;

The connecting section is provided with an air inlet communicated with the second air inlet channel and the external environment, the extension section is provided with an air outlet communicated with the third air outlet channel and the external environment, and the air inlet and the air outlet are spaced at a preset distance.

The above-mentioned setting of giving the extension section among the exhaust apparatus makes to have a determining deviation between gas vent and the air inlet, consequently avoids the air inlet to form icicle and causes the potential safety hazard, avoids the comdenstion water refluence and influences the life who installs this heating equipment for exhaust apparatus simultaneously, still can prevent to participate in the burning again through the air inlet backward flow from the exhaust gas exhaust flue gas.

in one embodiment, the air supply and exhaust device comprises a main pipe forming the main body section, the main pipe comprises a main exhaust pipe and a main intake pipe surrounding the periphery of the main exhaust pipe, the first exhaust channel is formed inside the main exhaust pipe, and the first intake channel is formed between the main exhaust pipe and the main intake pipe.

In one embodiment, the air supply and exhaust device further comprises a connecting pipeline forming the connecting section, the connecting pipeline comprises a secondary exhaust pipe and a secondary air inlet pipe surrounding the periphery of the secondary exhaust pipe, the second exhaust channel is formed inside the secondary exhaust pipe, and the second air inlet channel is formed between the secondary air inlet pipe and the secondary exhaust pipe; the air inlet is arranged on the auxiliary air inlet pipe.

In one embodiment, a plurality of the air inlets are arranged on the side wall of the secondary air inlet pipe at intervals along the circumferential direction.

In one embodiment, one end of the secondary exhaust pipe protrudes out of the secondary intake pipe and bends and extends in a direction away from the secondary intake pipe.

In one embodiment, the air inlet is located on one side of the second air inlet channel in the circumferential direction, and the connecting section further includes a protective structure extending from one side edge of the second air inlet channel, which is not provided with the air inlet in the circumferential direction, to a direction away from the second air inlet channel.

In one embodiment, an angle of an end surface of the shielding structure on a side away from the second air intake passage with respect to a central axis of the second air intake passage is an obtuse angle.

In one embodiment, the air supply and exhaust device further comprises an extension pipe forming the extension section, the third exhaust channel is formed inside the extension pipe, and the exhaust port is opened at one end of the extension pipe, which is far away from the connecting section.

In one embodiment, the extension duct includes an extension duct main body and an extension duct protector, one end of the extension duct main body is communicated with the second exhaust passage, one end of the extension duct main body, which is far away from the second exhaust passage, is provided with the exhaust port, and the extension duct protector extends from one side edge of the exhaust port to a direction far away from the extension duct main body.

In one embodiment, an inclined angle of an end surface of the extension duct protector on a side away from the extension duct main body with respect to a central axis of the extension duct main body is an obtuse angle.

In one embodiment, the first exhaust passage is provided coaxially with the second intake passage, and the second exhaust passage is provided coaxially with the second intake passage.

Heating equipment comprises the air supply and exhaust device.

In one embodiment, the heating device is a gas wall-mounted furnace.

Drawings

Fig. 1 is a schematic structural diagram of an air supply and exhaust device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the connecting pipe of the air supply and exhaust device shown in FIG. 1;

FIG. 3 is a front view of the connecting duct of FIG. 2;

FIG. 4 is a schematic view of the elongated duct of the air supply and exhaust apparatus of FIG. 1;

Fig. 5 is a front view of the elongated conduit of fig. 4.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

it will be understood that when an element is referred to as being "secured to" 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," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a heating apparatus according to an embodiment of the present invention includes a heating apparatus main body (not shown) and an air supply and exhaust device 100 installed in the heating apparatus main body. In the following embodiments, the heating apparatus main body is a gas-fired water heater, and the air supply and exhaust device 100 is used for supplying fresh air in the external environment to the gas-fired water heater for fuel combustion, and simultaneously exhausting high-temperature flue gas generated by fuel combustion to the external environment. It should be understood that the following examples are illustrative only and do not limit the technical scope of the present application. In other embodiments, the gas supply and exhaust device 100 may be applied to other apparatuses, and is not limited herein.

With reference to fig. 1, the air supply and exhaust device 100 includes an adapter section, a main body section, a connecting section, and an extension section. Wherein, the switching section is used for connecting gas heating water heater, and the high temperature flue gas that fuel burning produced in the gas heating water heater is arranged to external environment through switching section, main part section, linkage segment and extension section in proper order, and fresh air among the external environment then gets into in the gas heating water heater through linkage section, main part section and switching section in proper order.

Specifically, the adapter section includes an adapter exhaust passage 212 and an adapter intake passage 232 surrounding the adapter exhaust passage 212; the main body section is connected to one end of the adapter section and comprises a first exhaust channel 412 and a first intake channel 432 surrounding the first exhaust channel 412; the connecting section is connected to one end of the main body section and comprises a second exhaust channel 612 and a second air inlet channel 632 surrounding the second exhaust channel 612; the extension section is connected to the end of the connecting section remote from the main section and includes a third vent passage 812. The connection section is provided with an air inlet 634 communicating the second air inlet channel 632 with the external environment, the extension section is provided with an air outlet 814 communicating the third air outlet channel 812 with the external environment, and the air inlet 634 and the air outlet 814 are spaced at a preset distance.

Thus, the switching exhaust passage 212, the first exhaust passage 412, the second exhaust passage 612 and the third exhaust passage 812 are sequentially communicated to form a complete exhaust passage, and high-temperature flue gas generated by fuel combustion in the gas-fired heating water heater sequentially passes through the switching exhaust passage 212, the first exhaust passage 412, the second exhaust passage 612 and the third exhaust passage 812 and is finally exhausted to the external environment through the exhaust port 814. The switching air inlet passage 232, the first air inlet passage 432 and the second air inlet passage 632 are sequentially communicated to form a complete air inlet passage, and fresh air in the external environment enters the second air inlet passage 632 from the air inlet 634 and then sequentially passes through the first air inlet passage 432 and the switching air inlet passage 232 to enter the gas heating hot water boiler for combustion.

When the exhaust port 814 and the air inlet 634 are arranged in a concentrated manner, high-temperature flue gas exhausted from the exhaust port 814 is easily sucked back to the air inlet 634, the flue gas returning to the air inlet 634 is condensed into condensed water at the air inlet 634 after being cooled, and when the temperature of the external environment is too low, the condensed water is frozen to form icicles and a safety risk of falling off exists. When the ambient temperature rises, the water after the icicles are melted flows into the gas-fired water heater through the air inlet 634, so that the internal parts of the gas-fired water heater are corroded, thereby affecting the service life of the gas-fired water heater.

The arrangement of the extension section in the air supply and exhaust device 100 makes a certain distance between the air outlet 814 and the air inlet 634, thereby avoiding the safety hazard caused by the formation of icicles at the air inlet 634, avoiding the backflow of condensed water to affect the service life of the heating equipment mounted with the air supply and exhaust device 100, and preventing the smoke exhausted from the air outlet 814 from flowing back through the air inlet 634 and participating in combustion again.

Referring to fig. 1, the air supply and exhaust device 100 includes a transit pipe 20 forming a transit section, a main pipe 40 forming a main section, a connecting pipe 60 forming a connecting section, and an extension pipe 80 forming an extension section, wherein the transit pipe 20, the main pipe 40, the connecting pipe 60, and the extension pipe 80 are detachably connected in sequence.

It is understood that adjacent pipes may be detachably connected or may be integrally formed. For example: in some embodiments, the main conduit 40 is integrally formed with the connecting conduit 60, and the extension conduit 80 is detachably connected to the connecting conduit 60; in some embodiments, the main conduit 40 is removably connected to the connecting conduit 60, and the connecting conduit 60 is integrally formed with the extension conduit 80.

Specifically, in some embodiments, the transition duct 20 includes a transition exhaust duct 21 and a transition intake duct 23. The adapting exhaust pipe 21 is a hollow tubular structure with two open ends, and an adapting exhaust channel 212 is formed inside the adapting exhaust pipe 21. The adapter air inlet pipe 23 is also a hollow tubular structure with openings at two ends, the adapter air inlet pipe 23 and the adapter exhaust pipe 21 are coaxially arranged, the inner diameter of the adapter air inlet pipe 23 is larger than the outer diameter of the adapter exhaust pipe 21 and surrounds the periphery of the adapter exhaust pipe 21, and an adapter air inlet channel 232 coaxial with the adapter exhaust channel 212 is formed between the adapter air inlet pipe 23 and the adapter exhaust pipe 21. The two ends of the switching pipeline 20 are respectively connected with the gas heating water heater and the main pipeline 40, the flue gas output by the gas heating water heater can enter the main pipeline 40 through the switching exhaust pipe 21, and the fresh air in the main pipeline 40 is conveyed to the gas heating water heater through the switching intake pipe 23.

Further, in an embodiment, one end of the adapting pipe 20 connected to the main pipe 40 is bent and extended, and an included angle between a central axis of one end of the adapting pipe 20 connected to the gas heating water heater and a central axis of one end of the adapting pipe 20 connected to the main pipe 40 is 90 °, so that the flow direction of the air flow can be changed for the adapting pipe 20. It is understood that the shape of the transit passage 20 is not limited thereto, and may be set as desired.

The main pipe 40 includes a main exhaust pipe 41 and a main intake pipe 43, the main exhaust pipe 41 has a hollow tubular structure with both ends open, and a first exhaust passage 412 is formed inside the main exhaust pipe 41. The main intake pipe 43 is also a hollow tubular structure with openings at both ends, the main intake pipe 43 is disposed coaxially with the main exhaust pipe 41, the inner diameter of the main intake pipe 43 is larger than the outer diameter of the main exhaust pipe 41 and surrounds the periphery of the main exhaust pipe 41, and a first intake passage 432 coaxial with the first exhaust passage 412 is formed between the main intake pipe 43 and the main exhaust pipe 41.

One end of the main intake pipe 43 is inserted into the adapter intake pipe 23 to communicate the first intake passage 432 with the adapter intake passage 232, and the other end of the main intake pipe 43 is connected to the connection pipe 60. One end of the main exhaust pipe 41 is connected to the adapter exhaust pipe 21 so that the first exhaust passage 412 communicates with the adapter exhaust passage 212, and the other end of the main exhaust pipe 41 protrudes out of the main intake pipe 43 to be connected to the connection pipe 60.

As shown in fig. 1, 2, and 3, the connection duct 60 includes a sub-exhaust pipe 61 and a sub-intake pipe 63. The secondary exhaust pipe 61 has a hollow tubular structure with both ends open, and the interior of the secondary exhaust pipe 61 forms a second exhaust passage 612. The sub-inlet pipe 63 is a hollow cylindrical structure with an opening at one end, the inner diameter of the sub-inlet pipe 63 is larger than the outer diameter of the sub-exhaust pipe 61 and surrounds the outer periphery of the sub-exhaust pipe 61, and a second inlet passage 632 coaxial with the first inlet passage 432 is formed between the sub-inlet pipe 63 and the sub-exhaust pipe 61.

The open end of the auxiliary inlet pipe 63 is detachably sleeved on the main inlet pipe 43, and a sealing ring is arranged between the auxiliary inlet pipe 63 and the main inlet pipe 43 to prevent gas from leaking between the two. An air inlet 634 communicated with the outside is formed in the side wall of the auxiliary air inlet pipe 63, and outside air enters the auxiliary air inlet pipe 63 through the side wall of the auxiliary air inlet pipe 63. One end of the auxiliary exhaust pipe 61 is detachably sleeved on the main exhaust pipe 41 to communicate the first exhaust passage 412 with the first exhaust passage 412, and a sealing ring is arranged between the auxiliary exhaust pipe 61 and the main exhaust pipe 41 to prevent gas from leaking from a gap therebetween. The other end of the sub-discharge pipe 61 protrudes out of the closed end of the sub-intake pipe 63 to be connected to the extension pipe 80.

In one embodiment, the plurality of air inlets 634 are circumferentially spaced apart from a side wall of the sub-inlet pipe 63, so that the sub-inlet pipe 63 has a larger air inlet area, which effectively reduces air inlet resistance. Specifically, in one embodiment, the air inlet 634 is a kidney-shaped hole, and the length direction of the air inlet 634 extends along the axial direction of the secondary air inlet 63. It will be appreciated that the shape, size and number of the air inlets 634 are not limited and may be set as desired.

in some embodiments, the intake ports 634 are located on one side of the second intake passage 632 in the circumferential direction. The connecting section further includes a shielding structure 65, the shielding structure 65 extends from one side edge of the second air inlet channel 632, which is not provided with the air inlet 634 in the circumferential direction, to a direction away from the second air inlet channel 632, and an angle of an end surface of the shielding structure 65, which is away from one side of the second air inlet channel 632, relative to a central axis of the second air inlet channel 632 is an obtuse angle.

Specifically, in an embodiment, the plurality of air inlets 634 are disposed on a side wall of one side of the secondary air inlet pipe 63 in the circumferential direction, the connecting pipe 60 further includes a protective structure 65, the protective structure 65 extends from a side edge of the secondary air inlet pipe 63 where the air inlets 634 are not disposed to a direction away from the secondary air inlet pipe 63, and an angle of an end surface of the protective structure 65 on a side away from the main air inlet pipe 43 with respect to a central axis of the extension pipe main body 81 is an obtuse angle. Thus, when the air supply and exhaust device 100 is installed in the gas-heating water heater, the protection structure 65 is located above one side of the air inlet 634 to perform a shielding function, so that rainwater can be prevented from entering the second air inlet 632 through the air inlet 634, and the air supply and exhaust device 100 and the inside of the gas-heating water heater are prevented from being corroded by the rainwater.

in some embodiments, an end of the secondary air outlet pipe 61 protruding out of the secondary air inlet pipe 63 is bent and extended away from the secondary air inlet pipe 63. In this way, when the installation space in the axial direction of the main pipe 40 is small due to the blockage of the wall and the extension pipe 80 cannot be accommodated, the installation direction can be changed by bending the auxiliary exhaust pipe 61, so that the extension pipe 80 can extend along the extension direction of the wall, and the application range of the air supply and exhaust device 100 is expanded. Specifically, in some embodiments, the secondary exhaust pipe 61 includes a straight section extending in the extending direction of the secondary intake pipe 63 and a curved section extending in a curved manner, the straight section being detachably attached to the main exhaust pipe 41, and the curved section being detachably attached to an end of the straight section remote from the main exhaust pipe. In some embodiments, the straight sections and the curved sections may be integrally formed. It is understood that in some embodiments, the secondary exhaust pipe 61 extends in a straight direction when the secondary exhaust pipe 61 is not blocked by a wall.

As shown in fig. 1, 4 and 5, the extension pipe 80 is a hollow tubular structure with two open ends, a third exhaust channel 812 is formed inside the extension pipe 80, one end of the extension pipe 80 is connected to the auxiliary exhaust pipe 61, and an exhaust port 814 is opened at one end of the extension pipe 80 far from the connection section. In this way, the air outlet 814 is spaced apart from the air inlet 634 formed in the sub-air inlet 63 (the distance is greater than the length of the extension duct 80), so that the smoke exhausted from the air outlet 814 is prevented from being sucked into the air inlet.

Specifically, the extension duct 80 includes an extension duct main body 81 and an extension duct protector 83. The extension pipe main body 81 is a hollow tubular structure with two open ends, one end of the extension pipe main body 81 is detachably sleeved at one end of the auxiliary exhaust pipe 61 to be communicated with the second exhaust passage 612, and a sealing ring is arranged between the extension pipe main body 81 and the auxiliary exhaust pipe 61 to prevent gas from leaking from gaps between the extension pipe main body and the auxiliary exhaust pipe 61. The end of the extension duct main body 81 far from the second exhaust passage 612 is provided with an exhaust port 814, the extension duct protection part 83 extends from the edge of one side of the exhaust port 814 to the direction far from the extension duct main body 81, and the inclination angle of the end surface of the extension duct protection part 83 far from one side of the extension duct main body 81 relative to the central axis of the extension duct main body 81 is an obtuse angle. When the extension duct 80 is connected to the sub-exhaust duct 61, the extension duct guard 83 is located above the exhaust port 814 to shield the exhaust port 814, thereby blocking raindrops from falling into the exhaust port 814.

In the air supply and exhaust device 100 and the heating apparatus equipped with the air supply and exhaust device 100, since the air inlet 634 of the air supply and exhaust device 100 is spaced from the air outlet 814 by a certain distance, the flue gas exhausted from the air outlet 814 can be prevented from flowing back to the air inlet 634, and further the high-temperature flue gas flowing back to the air inlet 634 is prevented from forming icicles at the air inlet 634 to cause potential safety hazards, and further the water formed by melting the icicles can be prevented from entering the heating apparatus main body from the air inlet 634 to corrode internal devices. In addition, the smoke is prevented from flowing back into the heating apparatus main body through the air inlet 634 to participate in combustion again.

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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (13)

1. A gas supply and exhaust device (100), characterized in that the gas supply and exhaust device (100) comprises:

a main body section including a first exhaust passage (412) and a first intake passage (432) surrounding the first exhaust passage (412);

The connecting section is connected to one end of the main body section and comprises a second exhaust channel (612) and a second air inlet channel (632) surrounding the second exhaust channel (612), the second exhaust channel (612) is communicated with the first exhaust channel (412), and the second air inlet channel (632) is communicated with the first air inlet channel (432); and

An extension section connected to an end of the connection section remote from the main body section, the extension section comprising a third vent passage (812), the third vent passage (812) communicating with the second vent passage (612);

wherein, the connection section is provided with an air inlet (634) communicating the second air inlet channel (632) with the external environment, the extension section is provided with an air outlet (814) communicating the third air outlet channel (812) with the external environment, and the air inlet (634) and the air outlet (814) are separated by a preset distance.

2. The gas supply and exhaust device (100) according to claim 1, wherein the gas supply and exhaust device (100) comprises a main pipe (40) forming the main body section, the main pipe (40) comprises a main exhaust pipe (41) and a main intake pipe (43) surrounding the outer periphery of the main exhaust pipe (41), the first exhaust passage (412) is formed inside the main exhaust pipe (41), and the first intake passage (432) is formed between the main exhaust pipe (41) and the main intake pipe (43).

3. The gas supply and exhaust device (100) according to claim 1, wherein the gas supply and exhaust device (100) further comprises a connecting pipe (60) forming the connecting section, the connecting pipe (60) comprises a secondary exhaust pipe (61) and a secondary intake pipe (63) surrounding the outer periphery of the secondary exhaust pipe (61), the secondary exhaust pipe (61) has an interior forming the second exhaust passage (612), and the secondary intake pipe (63) and the secondary exhaust pipe (61) form the second intake passage (632) therebetween; the air inlet (634) is opened in the sub-inlet pipe (63).

4. The air supply and exhaust device (100) as claimed in claim 3, wherein the plurality of air inlets (634) are circumferentially spaced apart from a side wall of the sub-inlet pipe (63).

5. The air supply and exhaust device (100) as claimed in claim 3, wherein one end of the secondary exhaust pipe (61) protrudes out of the secondary intake pipe (63) and bends and extends away from the secondary intake pipe (63).

6. The apparatus (100) of claim 1, wherein the inlet (634) is located on one side of the second inlet channel (632) in the circumferential direction, and the connecting section further comprises a shielding structure (65), and the shielding structure (65) extends from an edge of the second inlet channel (632) on the side where the inlet (634) is not located in the circumferential direction, in a direction away from the second inlet channel (632).

7. The apparatus (100) of claim 6, wherein an end surface of the shielding structure (65) on a side away from the second intake passage (632) is at an obtuse angle with respect to a central axis of the second intake passage (632).

8. The apparatus (100) of claim 1, further comprising an extension duct (80) forming the extension section, wherein the extension duct (80) forms the third exhaust channel (812) therein, and wherein the exhaust port (814) opens at an end of the extension duct (80) remote from the connection section.

9. The apparatus (100) of claim 8, wherein the extension duct (80) comprises an extension duct main body (81) and an extension duct protection portion (83), one end of the extension duct main body (81) is connected to the second exhaust duct (612), one end of the extension duct main body (81) far away from the second exhaust duct (612) is provided with the exhaust port (814), and the extension duct protection portion (83) extends from one side edge of the exhaust port (814) to a direction far away from the extension duct main body (81).

10. The air supply and exhaust device (100) as claimed in claim 9, wherein an inclination angle of an end surface of the extended duct protector (83) on a side away from the extended duct main body (81) with respect to a central axis of the extended duct main body (81) is an obtuse angle.

11. The gas supply and exhaust device (100) of claim 1, wherein the first exhaust passage (412) is disposed coaxially with the second intake passage (632), and the second exhaust passage (612) is disposed coaxially with the second intake passage (632).

12. A heating apparatus, comprising a gas supply and exhaust device (100) according to any one of claims 1-11.

13. The heating apparatus according to claim 12, wherein the heating apparatus is a gas wall-mounted boiler.