Air inlet structure of air-blast gas stove and air-blast gas stove

Abstract

The application discloses an air inlet structure of a blast gas stove and the blast gas stove. The air inlet structure of the blast gas stove comprises a first gas pipeline, a first air inlet pipe, a second air inlet pipe, a blast pipe and a blower. The first air inlet pipe and the second air inlet pipe are coaxially arranged, and the outlet end of the first air inlet pipe extends into the inner cavity of the second air inlet pipe. An annular channel is arranged between the outer side wall of the outlet end of the first air inlet pipe and the inner side wall of the second air inlet pipe, and the inner side wall of the inlet of the second air inlet pipe and the outer side wall of the inlet of the first air inlet pipe are sealed. The blast pipe is connected with the second air inlet pipe, and the blast pipe is internally provided with a blast channel. The blower is arranged at the inlet of the blast channel, the outlet of the blast channel is communicated with the annular channel, and the side wall of the inlet of the first air inlet pipe is provided with a backflow groove. The two ends of the backflow groove are respectively communicated with the contraction cavity of the first air inlet pipe and the blast channel. The application can avoid gas backflow caused leakage and improve the safety of the blast gas stove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas stoves, in particular to an air inlet structure of a blast gas stove and the blast gas stove. BACKGROUND

[0002] The blast gas stove is a gas stove with a blower, the blower blows air to the air inlet pipe through the air blowing channel to increase the air inlet amount, so that the gas stove has a larger firepower and has a "blasting" function. However, when the blower of the existing blast gas stove does not work, part of the gas will enter the air blowing channel and then flow out through the inner cavity of the blower, causing gas leakage and safety hazards. SUMMARY

[0003] The present application provides an air inlet structure of a blast gas stove and the blast gas stove, which can avoid gas backflow and leakage, and improve the safety of the blast gas stove.

[0004] To solve the above problems, the present application adopts the following technical scheme:

[0005] According to the first aspect of the present application, the embodiments of the present application provide an air inlet structure of a blast gas stove, comprising a first gas pipe, a first air inlet pipe, a second air inlet pipe, an air blowing pipe and a blower, the first air inlet pipe comprises a contraction cavity and a mixing cavity connected in sequence along the air inlet direction, the first air inlet pipe and the second air inlet pipe are coaxially arranged, and the outlet end of the first air inlet pipe extends into the inner cavity of the second air inlet pipe and communicates with the inner cavity of the second air inlet pipe; an annular channel is arranged between the outer side wall of the outlet end of the first air inlet pipe and the inner side wall of the second air inlet pipe, and the inner side wall of the inlet of the second air inlet pipe and the outer side wall of the inlet of the first air inlet pipe are in airtight connection; the air blowing pipe is connected with the second air inlet pipe, and the air blowing pipe is provided with an air blowing channel, the blower is arranged at the inlet of the air blowing channel, the outlet of the air blowing channel communicates with the annular channel, and the outlet of the air blowing channel is located at the rear side of the outlet of the first air inlet pipe; the side wall at the inlet of the first air inlet pipe is provided with a backflow groove, and the two ends of the backflow groove respectively communicate with the contraction cavity of the first air inlet pipe and the air blowing channel.

[0006] Preferably, the air blowing pipe is integrally connected with the second air inlet pipe, and the inner side wall of the air blowing pipe and the outer side wall of the first air inlet pipe enclose the air blowing channel.

[0007] Preferably, the air blowing channel extends in a direction forming an angle of 45-50° with the central axis of the second air inlet pipe.

[0008] Preferably, the width L1 of the front part of the annular channel is 1-1.2mm, and the width L2 of the bottom part of the annular channel is 0.8-1.5mm.

[0009] Preferably, the distance L3 between the frontmost side of the outlet of the blast passage and the end face of the outlet end of the first air inlet pipe is greater than or equal to 6.8 mm.

[0010] Preferably, the end face of the inlet end of the first air inlet pipe is recessed inward to form the backflow groove, and the distance L4 between the bottom wall of the backflow groove and the end face of the inlet end of the blast pipe is 3 mm.

[0011] Preferably, the diameter S1 of the outlet end of the contraction cavity is greater than the diameter S2 of the outlet end of the mixing cavity.

[0012] Preferably, the diameter S1 of the outlet end of the contraction cavity is 14 mm, and the diameter S2 of the outlet end of the mixing cavity is 13 mm.

[0013] Preferably, the distance L5 between the end face of the outlet end of the first gas pipe and the end face of the outlet end of the first air inlet pipe is 41.3 mm.

[0014] According to a second aspect of the present application, embodiments of the present application provide a blast gas stove, comprising a burner and the air inlet structure of any one of the first aspect.

[0015] The present application has at least the following beneficial effects: the inner side wall of the inlet end of the first air inlet pipe is provided with a backflow groove, the two ends of the backflow groove are respectively communicated with the contraction cavity of the first air inlet pipe and the blast passage, when the blower stops working, if there is gas backflow to the blast passage, under the action of the first gas pipe jetting gas, the gas in the blast passage enters the first air inlet pipe through the backflow groove and flows back to the second air inlet pipe, and does not leak out through the blower, thereby avoiding the leakage caused by gas backflow, eliminating the safety hazard, and improving the safety of the blast gas stove. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a cross-sectional view of an air inlet structure of a blast gas stove according to an embodiment of the present application.

[0017] Figure 2 FIG. 2 is a partial cross-sectional view of a blast gas stove according to an embodiment of the present application.

[0018] Figure 3 FIG. 3 is a cross-sectional view of an air inlet structure of a blast gas stove according to another embodiment of the present application.

[0019] Figure 4 FIG. 4 is a partial cross-sectional view of a blast gas stove according to another embodiment of the present application.

[0020] In the drawings, the reference signs are as follows:

[0021] A first gas pipe 110, a second gas pipe 120, a switch valve 121, a sub-intake structure 130;

[0022] A reflux groove 201, a first intake pipe 210, a contraction cavity 211, a mixing cavity 212, a second intake pipe 220;

[0023] A blast pipe 300, a blast passage 310, a blower 400;

[0024] A burner head 500, a connecting pipe 510. DETAILED DESCRIPTION

[0025] The present disclosure is provided to help the understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. The description includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes, modifications and implementations can be made thereto without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions can be omitted for clarity and conciseness.

[0026] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and consistent understanding of the present disclosure. Accordingly, those of ordinary skill in the art will appreciate that the description of various embodiments of the present disclosure is merely provided to illustrate, not to limit, the present disclosure as defined by the appended claims and their equivalents.

[0027] The terms "have", "may have", "include", or "may include" as used herein indicate the presence of the corresponding function, operation, element, etc. disclosed, but do not limit one or more additional functions, operations, elements, etc. In addition, it should be understood that the terms "include" or "have" as used in various embodiments of the present disclosure are intended to indicate the presence of features, numbers, operations, elements, components, or combinations thereof described in the specification, but do not exclude the presence or addition of one or more other features, numbers, operations, elements, components, or combinations thereof.

[0028] It should be understood that when an element (e.g., a first element) is "connected" with another element (e.g., a second element), the element can be directly connected with the other element, or there can be an intervening element (e.g., a third element) between the element and the other element.

[0029] Embodiments of the present disclosure provide an air intake structure of a blast gas stove, such as Figure 1As shown, it comprises a first gas pipeline 110, a first air inlet pipe 210, a second air inlet pipe 220, a blast pipe 300 and a blower 400. The first air inlet pipe 210 comprises a converging cavity 211 and a mixing cavity 212 connected in sequence along the air inlet direction, wherein the inner diameter of the converging cavity 211 gradually decreases along the air inlet direction, and the inner diameter of the mixing cavity 212 gradually decreases or remains unchanged along the air inlet direction. The first air inlet pipe 210 and the second air inlet pipe 220 are coaxially arranged, both of which have an inlet and an outlet, and the gas enters from the inlet and flows out from the outlet. The outlet end (the end provided with the outlet) of the first air inlet pipe 210 extends into the second air inlet pipe 220 from the inlet of the second air inlet pipe 220 and communicates with the inner cavity of the second air inlet pipe 220. An annular channel is arranged between the outer side wall of the outlet end of the first air inlet pipe 210 and the inner side wall of the second air inlet pipe 220, i.e. there is a gap between the outlet ends of the two, for connecting the blast pipe 300. The inner side wall at the inlet of the second air inlet pipe 220 and the outer side wall at the inlet of the first air inlet pipe 210 are tightly connected, so that the gas cannot leak from the gap between the first air inlet pipe 210 and the second air inlet pipe 220. The first gas pipeline 110 is connected to the first air inlet pipe 210 and is used to inject gas into the first air inlet pipe 210. Specifically, the first gas pipeline 110 can be on the axial center line of the first air inlet pipe 210 and inject gas in a direction parallel to the axial direction of the first air inlet pipe 210. After the gas passes through the first air inlet pipe 210, it enters the second air inlet pipe 210, and the air inlet direction in the second air inlet pipe 210 is also basically parallel to the axial direction of the second air inlet pipe 210. Usually, the outlet end of the first gas pipeline 110 can be provided with a nozzle to inject gas flow through the nozzle.

[0030] The blast pipe 300 is connected to the second air inlet pipe 220, and the blast pipe 300 is provided with a blast channel 310. The blower 400 is arranged at the inlet of the blast channel 310 and is used to blow air into the blast channel 310. The outlet of the blast channel 310 communicates with the annular channel to make the air enter the second air inlet pipe 220 through the blast channel 310.

[0031] The outlet of the air blowing passage 310 is located at the rear side of the outlet of the first air inlet pipe 210, specifically, relative to the air inlet direction of the second air inlet pipe 220, so that when the gas flows out of the outlet of the first air inlet pipe 210, it continues to flow to the outlet of the second air inlet pipe 220, and is not easy to flow to the air blowing passage 310 located at the rear side, which reduces the possibility of gas backflow and can reduce the gas flowing into the air blowing passage 310. The inner side wall at the inlet of the first air inlet pipe 210 is provided with a backflow groove 201, and the two ends of the backflow groove 201 are respectively communicated with the contraction cavity 211 of the first air inlet pipe 210 and the air blowing passage 310. When the air blower 400 stops working, if there is gas backflow to the air blowing passage 310, under the action of the gas injection of the first gas pipeline 110, the gas in the air blowing passage 310 enters the first air inlet pipe 210 through the backflow groove 201 and flows to the second air inlet pipe 220 again along the airflow, and will not leak out through the air blower 400, thereby avoiding the leakage caused by the gas backflow and eliminating the safety hazard, and improving the safety of the air blowing type gas stove.

[0032] In the embodiment, the inner side wall at the inlet of the second air inlet pipe 220 can be tightly attached to the outer side wall of the first air inlet pipe 210, so as to make the inner side wall at the inlet of the second air inlet pipe 220 and the outer side wall of the first air inlet pipe 210 airtight.

[0033] In some embodiments, the air blowing pipe 300 is integrally connected with the second air inlet pipe 220, which facilitates the manufacturing of the air blowing pipe 300 and the second air inlet pipe 220 into a shape, and can strengthen the connection strength of the air blowing pipe 300 and the second air inlet pipe 220. At the same time, the inner side wall of the air blowing pipe 300 and the outer side wall of the first air inlet pipe 210 enclose the air blowing passage 310, and the backflow groove 201 only needs to penetrate the side wall of the first air inlet pipe 210 to communicate with the air blowing passage 310, which is also convenient for arranging the backflow groove 201.

[0034] In some embodiments, the extension direction of the air blowing passage 310 forms an angle of 45°-50° with the central axis of the second air inlet pipe 220, preferably an angle of 46.5°, and under this angle, the air blowing passage 310 has a larger air inlet amount and better air inlet fluency.

[0035] In some embodiments, as Figure 1As shown, the width L1 of the front part (close to the outlet of the first air inlet pipe 210) of the annular channel is 1-1.2 mm, and the width L2 of the bottom part (close to the outlet of the contraction cavity 211) of the annular channel is 0.8-1.5 mm. The smaller the distance b between the outer side wall of the first air inlet pipe 210 and the inner side wall of the second air inlet pipe 220, the more difficult it is for the gas in the second air inlet pipe 220 to enter the blast channel 310, but the amount of air from the blast channel 310 into the second air inlet pipe 220 when the blower 400 is working normally will also be reduced. Conversely, the larger the distance b between the outer side wall of the first air inlet pipe 210 and the inner side wall of the second air inlet pipe 220, the more air from the blast channel 310 into the second air inlet pipe 220 when the blower 400 is working normally, but the gas in the second air inlet pipe 220 is more likely to enter the blast channel 310.

[0036] The embodiment limits the values of L1 and L2 described above, so that the gas in the second air inlet pipe 220 is not easy to enter the blast channel 310, and at the same time, the amount of air supply from the blast channel 310 into the second air inlet pipe 220 when the blower 400 is working normally is not affected.

[0037] In some embodiments, since the blast channel 310 has a certain width in the air inlet direction of the second air inlet pipe 220, the distance L3 between the frontmost side (the side closest to the outlet of the second air inlet pipe 220) of the outlet of the blast channel 310 and the end face of the outlet end of the first air inlet pipe 210 in the air inlet direction of the second air inlet pipe 220 is greater than or equal to 6.8 mm, which ensures that the outlet of the blast channel 310 is located on the rear side of the outlet of the first air inlet pipe 210 in the air inlet direction of the second air inlet pipe 220, and the distance between the two is large enough to make it more difficult for the gas to flow to the blast channel 310.

[0038] In some embodiments, the end face of the inlet end (the end where the inlet is located) of the first air inlet pipe 210 is recessed inward to form a backflow groove 201, that is, the backflow groove 201 is recessed from the end face of the inlet end of the first air inlet pipe 210 while also penetrating the side wall of the first air inlet pipe 210, so that the two ends of the backflow groove 201 are connected to the contraction cavity 211 and the blast channel 310 respectively. At the same time, the distance L4 between the bottom wall (the inner wall close to the outlet of the first air inlet pipe 210) of the backflow groove 201 and the end face of the inlet end of the blast pipe 211 is 3 mm, which ensures that the gas can backflow.

[0039] In some embodiments, the diameter S1 of the outlet of the contraction cavity 211 is greater than the diameter S2 of the outlet of the mixing cavity 212, which can ensure that the gas has sufficient kinetic energy. Specifically, the diameter S1 of the outlet end of the contraction cavity 211 is 14 mm, and the diameter S2 of the outlet end of the mixing cavity 212 is 13 mm.

[0040] Further, the distance L5 between the end face of the outlet end of the first gas pipeline 110 and the end face of the outlet end of the first air inlet pipeline 210 is 41.3 mm, which can ensure that the normal combustion and the air blast combustion are both good.

[0041] The embodiment of the present application also provides an air blast gas stove, as shown in the accompanying drawings, which comprises a burner 500 and the air inlet structure of the air blast gas stove according to any of the above embodiments, and the burner 500 is connected to the outlet end of the second air inlet pipeline 220 to supply the burner 500 with gas through the air inlet structure of the air blast gas stove according to the above embodiments. The specific description of the air inlet structure of the air blast gas stove can be referred to the above embodiments, which will not be repeated here. The burner 500 can comprise a connecting pipe 510 extending outward, and the outlet end of the second air inlet pipeline 220 can be connected to the connecting pipe 510. Figure 2

[0042] In some embodiments, as shown in the accompanying drawings, the air blast gas stove according to the embodiment further comprises a secondary air inlet structure 130, which is also used to supply the burner 500 with gas to increase the gas supply amount. The secondary air inlet structure 130 can adopt the conventional air inlet structure in the existing gas stove, for example, which comprises an air inlet nozzle and a Venturi tube. Figure 2

[0043] The embodiment of the present application also provides another air inlet structure of an air blast gas stove, as shown in the accompanying drawings, which is compared with the above embodiments. The air inlet structure of the air blast gas stove according to the embodiment further comprises a second gas pipeline 120, and a switch valve is arranged in the second gas pipeline 120, which is used to control the second gas pipeline 120 to be turned on or turned off. The outlet of the second gas pipeline 120 is in communication with the inner cavity of the second air inlet pipeline 220, and the second gas pipeline 120 can also supply the second air inlet pipeline 220 with gas to increase the gas supply amount, improve the heat load of the gas stove and increase the firepower of the gas stove. Figure 3

[0044] Generally, the switch valve and the air blower 400 according to the embodiment can be electrically connected to the control circuit of the gas stove. When the user needs to increase the firepower and starts the corresponding function, the control circuit can control the switch valve to be opened, the second gas pipeline 120 to be turned on, and the air blower 400 to be started at the same time, so as to increase the gas supply amount and the air supply amount at the same time, improve the heat load of the gas stove and increase the firepower of the gas stove. When the user does not start the corresponding function, the control circuit can control the switch valve to be closed, the second gas pipeline 120 to be turned off and the air blower 400 to be not started.

[0045] In the embodiment, the second gas pipeline 120 can be connected to the first gas pipeline 110, and both of them are supplied with gas by the same gas source, which can simplify the gas pipeline structure.

[0046] ​​​Correspondingly, the embodiment of the present application also provides another air-blast gas stove, such as Figure 4 As shown, compared with the air-blast gas stove of the previous embodiment, the air-blast gas stove of the present embodiment further comprises a second gas pipeline 120, the burner 500 comprises an outwardly extending connecting pipe 510, the inner cavity of the connecting pipe 510 is part of the mixing cavity, and the outlet end of the second air inlet pipe 220 is connected with the connecting pipe 510. The second gas pipeline 120 is provided with a switch valve 121, which is used to control the conduction or disconnection of the second gas pipeline 120, and the outlet of the second gas pipeline 120 is in communication with the inner cavity of the connecting pipe 510.

[0047] In the present embodiment, the outlet of the second gas pipeline 120 is directly communicated with the mixing cavity of the burner 500, which can also increase the gas supply amount, improve the heat load of the gas stove, and increase the firepower of the gas stove.

[0048] For detecting gas leakage, the traditional method is to ignite at the leakage position to determine whether the leaked gas can be burned, if there is flame flickering at the leakage position, there is leakage, otherwise, there is no leakage. For this purpose, the present embodiment provides several groups of experiments.

[0049] Experiment 1:

[0050] The extension direction of the air-blast channel 310 is set to form an angle of 90° with the axial direction of the second air inlet pipe 220, and when the air-blast fan 300 is stopped, ignition is performed at the air inlet of the air-blast fan 300, and there is flame flickering, therefore, the extension direction of the air-blast channel 310 is not suitable to form an angle of 90° with the axial direction of the second air inlet pipe 220.

[0051] Experiment 2:

[0052] The width L1 of the front part of the annular channel is set to 1.5 mm, the distance L3 between the frontmost side of the outlet of the air-blast channel 310 and the end surface of the outlet end of the first air inlet pipe 210 is set to 6.8 mm, and the extension direction of the air-blast channel 310 is set to form an angle of 46.5° with the axial direction of the second air inlet pipe 220, ignition is performed at the air inlet of the air-blast fan 300, and there is flame flickering, indicating that there is gas leakage; when L1 is adjusted to 0.8-1.2 mm, ignition is performed at the air inlet of the air-blast fan 300, and there is no flame flickering, indicating that there is no gas leakage.

[0053] Experiment 3:

[0054] When the width L1 of the front part of the annular channel is 1.2 mm, the distance L3 between the frontmost side of the outlet of the blast channel 310 and the end face of the outlet end of the first air inlet pipe 210 is 6.8 mm, the extension direction of the blast channel 310 forms an angle of 46.5° with the axial direction of the second air inlet pipe 220, and the distance L4 between the bottom wall of the backflow groove 201 and the end face of the inlet end of the blast pipe 211 is 0-1 mm, the flame flickers and the gas leaks when igniting at the air inlet of the blower 300; when L4 is adjusted to 3 mm, the flame does not flicker and the gas does not leak when igniting at the air inlet of the blower 300.

[0055] Experiment 4:

[0056] When the width L1 of the front part of the annular channel is 1.2 mm, the width L2 of the bottom part of the annular channel is greater than 1.5 mm, the distance L3 between the frontmost side of the outlet of the blast channel 310 and the end face of the outlet end of the first air inlet pipe 210 is 6.8 mm, and the extension direction of the blast channel 310 forms an angle of 46.5° with the axial direction of the second air inlet pipe 220, the flame flickers and the gas leaks when igniting at the air inlet of the blower 300; when L2 is adjusted to 0.8-1.5 mm, the flame does not flicker and the gas does not leak when igniting at the air inlet of the blower 300.

[0057] In order to verify the relationship between the spacing L5 between the end face of the outlet end of the first gas pipe 110 and the end face of the outlet end of the first air inlet pipe 210 and the combustion condition, the following groups of experiments are provided:

[0058] Experiment 5:

[0059] When the spacing L5 between the end face of the outlet end of the first gas pipe 110 and the end face of the outlet end of the first air inlet pipe 210 is 55.2 mm, the gas injection effect is poor, yellow flame phenomenon has appeared during normal combustion (without blast), and the combustion condition is poor with yellow flame during blast.

[0060] Experiment 6:

[0061] When L5 = 47.3 mm, the normal combustion (without blast) is in good condition, and the combustion condition is poor with yellow flame during blast.

[0062] Experiment 7:

[0063] When L5 = 41.3 mm, both the normal combustion and the blast combustion condition are good.

[0064] Experiment 8:

[0065] When L5 = 36.2 mm, the flame flickers and the gas leaks when igniting at the air inlet of the blower 300.

[0066] The above further describes the present application in detail in combination with specific embodiments, and cannot be deemed as limitation of the specific embodiments of the present application. Those skilled in the art to which the present application belongs can make some simple deductions or replacements without departing from the concept of the present application.

Claims

1. An air inlet structure of a gas stove of the forced air type, characterized in that: The air inlet structure comprises a first gas pipeline, a first air inlet pipe, a second air inlet pipe, a blast pipe and a blower, the first air inlet pipe comprises a converging cavity and a mixing cavity connected in sequence along the air inlet direction, the first air inlet pipe and the second air inlet pipe are coaxially arranged, and the outlet end of the first air inlet pipe extends into the inner cavity of the second air inlet pipe and communicates with the inner cavity of the second air inlet pipe; an annular channel is arranged between the outer side wall of the outlet end of the first air inlet pipe and the inner side wall of the second air inlet pipe, the inner side wall of the inlet of the second air inlet pipe and the outer side wall of the inlet of the first air inlet pipe are in airtight connection; the blast pipe is connected with the second air inlet pipe, and the blast pipe is internally provided with a blast channel, the blower is arranged at the inlet of the blast channel, the outlet of the blast channel communicates with the annular channel, and the outlet of the blast channel is located at the rear side of the outlet of the first air inlet pipe; the side wall of the inlet of the first air inlet pipe is provided with a backflow groove, and the two ends of the backflow groove respectively communicate with the converging cavity of the first air inlet pipe and the blast channel.

2. The air inlet structure of the gas stove according to claim 1, characterized in that: The blast pipe is integrally connected with the second air inlet pipe, and the inner side wall of the blast pipe and the outer side wall of the first air inlet pipe enclose the blast channel.

3. The air inlet structure of the gas stove according to claim 1, characterized in that: The extension direction of the blast channel forms an angle of 45°-50° with the central axis of the second air inlet pipe.

4. The air inlet structure of the gas stove according to claim 1, characterized in that: The width L1 of the front part of the annular channel is 1-1.2mm, and the width L2 of the bottom of the annular channel is 0.8-1.5mm.

5. The air inlet structure of the gas stove according to claim 1, characterized in that: The distance L3 between the frontmost side of the outlet of the blast channel and the end face of the outlet end of the first air inlet pipe is greater than or equal to 6.8mm.

6. The air inlet structure of the gas stove according to claim 1, characterized in that: The end face of the inlet end of the first air inlet pipe is recessed inward to form the backflow groove, and the distance L4 between the bottom wall of the backflow groove and the end face of the inlet end of the blast pipe is 3mm.

7. The air inlet structure of the gas stove according to any one of claims 1-6, characterized in that: The diameter S1 of the outlet end of the converging cavity is greater than the diameter S2 of the outlet end of the mixing cavity.

8. The air inlet structure of the gas stove according to claim 7, characterized in that: The diameter S1 of the outlet end of the converging cavity is 14mm, and the diameter S2 of the outlet end of the mixing cavity is 13mm.

9. The air inlet structure of the gas stove according to claim 7, characterized in that: The spacing L5 between the end face of the outlet end of the first gas pipeline and the end face of the outlet end of the first air inlet pipe is 41.3mm.

10. A gas forced draft burner, characterized by: The air inlet structure of the blast type gas stove comprises a burner and the air inlet structure according to any one of claims 1-9, and the burner is connected with the outlet end of the second air inlet pipe.

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