Premixed air intake structure and gas water heater having the same

Abstract

The present invention discloses a premixed air intake structure and a gas water heater having the same. The premixed air intake structure includes: a cover plate, an air flow passage is formed inside the cover plate, an air inlet and a mixture gas outlet are provided on the cover plate, and the air inlet and the mixture gas outlet are respectively communicated with the air flow passage; a gas joint, the gas joint is installed on the cover plate, the gas joint has a gas inlet and a gas outlet, the gas outlet extends into the air flow passage, the number of the gas outlets is multiple, and at least a part of the gas outlets have different orientations. The premixed air intake structure according to the embodiments of the present invention has the advantages of simple structure, small volume and good mixing effect, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and more particularly to a premixed air intake structure and a gas water heater having the same. Background Art

[0002] In the related art, a premixed blower for a gas water heater is proposed. This kind of premixed blower mixes air and gas by feeding them into the blower volute from respective independent flow channels, but has defects such as complex structure and low mixing efficiency of gas and air. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a premixed air intake structure, which is simple in structure and good in mixing effect.

[0004] The present invention also provides a gas water heater having the above-mentioned premixed air intake structure.

[0005] The premixed air intake structure according to the first aspect embodiment of the present invention includes: a cover plate, an air flow channel is formed in the cover plate, an air inlet and a mixed gas outlet are provided on the cover plate, and the air inlet and the mixed gas outlet are respectively communicated with the air flow channel; a gas joint, the gas joint is installed on the cover plate, the gas joint has a gas inlet and a gas outlet, the gas outlet extends into the air flow channel, the gas outlet is multiple and at least a part of the gas outlets have different orientations.

[0006] The premixed air intake structure according to the embodiment of the present invention has the advantages of simple structure, small volume and good mixing effect.

[0007] In addition, the premixed air intake structure according to the above embodiment of the present invention may further have the following additional technical features:

[0008] According to some embodiments of the present invention, a gas flow channel is formed in the gas joint, the gas flow channel communicates the gas inlet and the gas outlet, the gas flow channel is a variable-diameter flow channel and the cross-sectional area of the flow channel near the gas outlet is smaller than the cross-sectional area of the flow channel near the gas inlet.

[0009] Optionally, the gas flow channel includes: an inlet section, an outlet section and a transition section, the transition section is connected between the inlet section and the outlet section, the inlet section is connected to the gas inlet, the outlet section is connected to the gas outlet, and the cross-sectional area of the flow channel of the inlet section is larger than the cross-sectional area of the flow channel of the outlet section.

[0010] Furthermore, the transition section is a frustum-shaped surface with a gradually changing cross-sectional area of the flow channel.

[0011] Furthermore, the inlet section and the transition section are located outside the air flow channel, the outlet section extends into the air flow channel through the wall of the cover plate, a flange is provided on the outer peripheral surface of the transition section, and the flange is fixedly attached to the outer wall surface of the cover plate.

[0012] According to some embodiments of the present invention, the gas outlet penetrates through the circumferential wall of the outlet section to form a circumferential gas outlet, and a plurality of the circumferential gas outlets are arranged at intervals along the circumferential direction of the outlet section.

[0013] Optionally, the gas outlet further includes: an end gas outlet, the end gas outlet is provided at the free end of the outlet section, and the end gas outlet is open along the axial direction of the outlet section.

[0014] Furthermore, an annular protrusion is provided on the inner circumferential surface of the outlet section, the annular protrusion is located between the circumferential gas outlet and the end face of the free end of the outlet section, and the end gas outlet is defined by the annular protrusion.

[0015] Preferably, the annular protrusion has a smooth and arc-shaped gas flow surface.

[0016] Optionally, the circumferential gas outlet has a rounded structure capable of reducing the gas flow resistance.

[0017] According to some embodiments of the present invention, the cover plate includes: a cover plate body and an air duct plate provided on the cover plate body, and the air flow channel is defined between the air duct plate and the cover plate body.

[0018] Optionally, the air duct cover plate has a fan-shaped cross-section, and the air inlet is formed on the outer arc side of the air duct cover plate away from the center of the circle.

[0019] Furthermore, the gas outlet is located within the central region corresponding to the air duct cover plate.

[0020] Optionally, the air duct cover plate includes: an upper plate portion and a circumferential wall plate, the circumferential wall plate connects the upper plate portion and the cover plate body, and the connection between the circumferential wall plate and the upper plate portion is smoothly transitioned.

[0021] According to some embodiments of the present invention, the gas joint is arranged perpendicular to the air flow channel, the air inlet is perpendicular to the gas joint, and the orientation of the mixed gas outlet is the same as the length direction of the gas joint.

[0022] According to some embodiments of the present invention, the air flow channel is configured as a tapered air flow channel.

[0023] According to some embodiments of the present invention, a filter screen is provided at the air inlet.

[0024] The gas water heater according to the embodiment of the second aspect of the present invention includes a premixed air intake structure according to the embodiment of the first aspect of the present invention.

[0025] The gas water heater according to the embodiment of the present invention, by using the premixed air intake structure according to the embodiment of the first aspect of the present invention, has the advantages of sufficient gas combustion, energy conservation and environmental protection.

[0026] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0027] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0028] Figure 1 is a schematic structural diagram of the premixed air intake structure according to the embodiment of the present invention;

[0029] Figure 2 is a cross-sectional view of the premixed air intake structure according to the embodiment of the present invention with a part cut away;

[0030] Figure 3 is a cross-sectional view of the premixed air intake structure according to the embodiment of the present invention along the axial direction of the gas joint;

[0031] Figure 4 is Figure 3 a partial enlarged schematic view of part A in;

[0032] Figure 5 is a schematic structural diagram of the upper plate part of the premixed air intake structure according to the embodiment of the present invention;

[0033] Figure 6 is a schematic structural diagram of the gas joint of the premixed air intake structure according to the embodiment of the present invention.

[0034] Reference Signs:

[0035] Premixed air intake structure 100;

[0036] Cover plate 10; Air flow channel 10a; Air inlet 10b; Mixed gas outlet 10c; Cover plate body 11; Air duct plate 12; Upper plate part 121; Mounting hole 121a; Mounting plane 121b; Peripheral wall plate 122; Filter screen 13; Positioning groove 14;

[0037] Gas connector 20; gas inlet 21; gas outlet 22; circumferential gas outlet 221; rounded structure 221a; end gas outlet 222; gas flow channel 23; inlet section 231; transition section 232; outlet section 233; flange 24; annular projection 25; gas flow surface 25a;

[0038] Seal 30. Detailed implementation manner

[0039] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Next, refer to Figures 1-6 Describe the premixed air inlet structure 100 according to the embodiment of the first aspect of the present invention. The premixed air inlet structure 100 of the embodiment of the present invention can be used for a gas water heater.

[0043] As Figures 1-3 shown, the premixed air inlet structure 100 according to the embodiment of the present invention includes a cover plate 10 and a gas connector 20.

[0044] Among them, an air flow passage 10a is formed in the cover plate 10. An air inlet 10b and a mixed gas outlet 10c are provided on the cover plate 10. The air inlet 10b and the mixed gas outlet 10c are respectively communicated with the air flow passage 10a. The gas connector 20 is installed on the cover plate 10. The gas connector 20 has a gas inlet 21 and a gas outlet 22. The gas outlet 22 extends into the air flow passage 10a. There are multiple gas outlets 22 and at least a part of the gas outlets 22 have different orientations.

[0045] Specifically, the gas connector 20 is used to convey gas into the air flow passage 10a in the cover plate 10. The gas connector 20 is installed on the cover plate 10 and at least a part of the gas connector 20 is located in the air flow passage 10a. The gas inlet 21 is formed in the part of the gas connector 20 located outside the air flow passage 10a. The gas inlet 21 is used to connect a gas delivery pipe (not shown in the figure). The gas outlet 22 is formed in the part of the gas connector 20 located in the air flow passage 10a. For example, in Figure 3 the illustrated embodiment, the lower part of the gas connector 20 extends into the air flow passage 10a. Multiple gas outlets 22 are defined by the lower end of the gas connector 20. The upper part of the gas connector 20 is located outside the air flow passage 10a. The gas inlet 21 is defined by the upper end of the gas connector 20.

[0046] It can be understood that the orientation of the gas outlet 22 refers to the opening direction of the gas outlet 22, that is, the opening directions of at least two of the multiple gas outlets 22 are different. In addition, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0047] The working mode of the premixing air inlet structure 100 according to an embodiment of the present invention is described below. The gas delivery pipe conveys gas into the gas connector 20 through the gas inlet 21. The gas enters the air flow passage 10a along different directions after being split by the multiple gas outlets 22. The outside air enters the air flow passage 10a through the air inlet 10b, and then after being mixed with the gas in the air flow passage 10a, the mixed gas is discharged through the mixed gas outlet 10c.

[0048] It should be noted that the premixing air inlet structure 100 of the embodiment of the present invention is used for premixing air and gas. The mixed gas outlet 10c is adapted to be connected to a fan (not shown in the figure). The premixed mixed gas enters the fan volute through the mixed gas outlet 10c for further stirring and mixing, and then is ejected from the fan air outlet.

[0049] The premixed air inlet structure 100 according to an embodiment of the present invention can mix gas and air in the air flow channel 10a within the cover plate 10 by providing the gas connector 20 and the cover plate 10. The structure is relatively simple, and the volume of the overall structure is small, so that the installation space occupied by the premixed air inlet structure 100 can be reduced. Furthermore, by providing a plurality of gas outlets 22 on the gas connector 20 and at least a part of the gas outlets 22 having different orientations, when the gas enters the air flow channel 10a from the gas connector 20, the gas can be diverted in different directions, thereby improving the mixing efficiency of the gas and air and achieving a good mixing effect. Therefore, the premixed air inlet structure 100 according to the embodiment of the present invention has the advantages of simple structure, small volume, and good mixing effect.

[0050] In some embodiments of the present invention, as Figures 1-3 shown, the cover plate 10 includes a cover plate body 11 and an air duct plate 12. The air duct plate 12 is provided on the cover plate body 11, and an air flow channel 10a is defined between the air duct plate 12 and the cover plate body 11.

[0051] Specifically, the cover plate body 11 can be connected to the upper surface of the air duct plate 12 to define an air flow channel 10a between the cover plate body 11 and the air duct plate 12. The air duct plate 12 is provided with an installation hole 121a communicating with the air flow channel 10a, and the gas connector 20 is inserted into the installation hole 121a so that the gas outlet 22 of the gas connector 20 extends into the air flow channel 10a. Thus, by providing the cover plate body 11 and the air duct plate 12, the cover plate 10 can be configured as a flattened structure, thereby reducing the size of the cover plate 10 in the height direction, and further reducing the overall thickness of the premixed air inlet structure 100 and further reducing the volume of the whole machine.

[0052] Preferably, the cover plate body 11 and the air duct plate 12 are integrally formed. Thus, the assembly process of the cover plate body 11 and the air duct plate 12 is omitted, the overall structural strength of the cover plate body 11 and the air duct plate 12 is good, and the airtightness of the air flow channel 10a is ensured.

[0053] Optionally, the air duct cover plate 10 includes an upper plate portion 121 and a peripheral wall plate 122. The peripheral wall plate 122 connects the upper plate portion 121 and the cover plate body 11, and the connection between the peripheral wall plate 122 and the upper plate portion 121 is smoothly transitioned.

[0054] Specifically, there are two peripheral wall plates 122, which are respectively located on opposite sides of the upper plate portion 121. Among them, the upper edge of each peripheral wall plate 122 is connected to the side edge of the upper plate portion 121 on the side opposite to this peripheral wall plate 122, and the lower edge of each peripheral wall plate 122 is connected to the upper surface of the cover plate body 11. The lower surface of the upper plate portion 121, the side surfaces of the two peripheral wall plates 122, and the upper surface of the cover plate body 11 jointly define an air flow passage 10a. It can be understood that "smooth transition" refers to a structure in which a rounded corner is formed at the connection between the peripheral wall plate 122 and the upper plate portion 121, that is, the peripheral wall plate 122 and the upper plate portion 121 are transitioned through a smooth curved surface. Thus, the spatial shape of the air flow passage 10a has no sharp corners and is smoother, which can reduce the resistance generated by the air flow at the corners, ensure the air flow velocity in the air flow passage 10a, and at the same time reduce the friction between the air and the inner wall of the air flow passage 10a, achieving a noise reduction effect.

[0055] As Figure 3 and Figure 5 shown, the upper surface of the upper plate portion 121 has a mounting plane 121b. The mounting hole 121a is provided in the middle of the mounting plane 121b, and the mounting hole 121a penetrates the upper plate portion 121 in the thickness direction of the upper plate portion 121. The gas connector 20 is provided with a flange. When the gas connector 20 is inserted into the mounting hole 121a, the flange is supported on the mounting plane 121b, and the flange and the mounting plane 121b are connected by fasteners to form a flange fit. Thus, the connection between the gas connector 20 and the upper plate portion 121 is relatively convenient and the connection effect is good.

[0056] Furthermore, a seal 30 is provided between the mounting plane 121b and the flange. Specifically, a downwardly concave positioning groove 14 is provided on the mounting plane 121b. The positioning groove 14 extends along the circumference of the mounting plane 121b and surrounds the mounting hole 121a. The seal 30 is embedded in the positioning groove 14, and among them, the seal 30 can be a rubber ring. Thus, the sealing effect between the mounting plane 121b and the flange can be improved.

[0057] Optionally, the air duct cover plate 10 has a fan-shaped cross-section, and the air inlet 10b is formed on the outer arc side of the air duct cover plate 10 away from the center of the circle. It should be noted that the "fan-shaped cross-section" means that the cross-sectional shape of the air duct cover plate 10 in the horizontal direction is fan-shaped, and this fan shape can be a strictly defined fan shape or an approximately fan-shaped shape. The air inlet 10b is located on the side of the air duct cover plate 10 away from the center of the circle. Thus, on the one hand, the cross-sectional area of the air inlet 10b is relatively large, which can ensure sufficient air intake. On the other hand, after the air enters the air flow channel 10a from the air inlet 10b, it flows horizontally towards the center of the fan shape, and the flow area of the air gradually decreases, so that the flow velocity of the air gradually increases, which can further improve the mixing efficiency of the air and the gas.

[0058] Furthermore, the gas outlet 22 is located within the central region corresponding to the air duct cover plate 10. That is to say, the mounting hole 121a is adjacent to the center of the fan shape. Since the flow velocity of the air reaches the maximum when it flows to the center of the fan shape, when the gas enters the air flow channel 10a, it can stir the air, thereby further improving the mixing efficiency of the gas and the air.

[0059] In some embodiments of the present invention, as Figure 3 shown, the gas connector 20 is arranged perpendicular to the air flow channel 10a, the air inlet 10b is perpendicular to the gas connector 20, and the orientation of the mixed gas outlet 10c is the same as the length direction of the gas connector 20.

[0060] Specifically, the length direction of the gas connector 20 is parallel to the vertical direction (the up and down direction in the figure), and the air flow channel 10a is arranged horizontally, that is, the flow direction of the air in the air flow channel 10a is parallel to the horizontal direction. Thus, there is an included angle between the flow directions of the air and the gas, thereby improving the mixing efficiency of the air and the gas. The mixed gas outlet 10c is provided on the cover body 11 and penetrates the cover body 11 in the thickness direction of the cover body 11. The position of the mixed gas outlet 10c corresponds to the position of the mounting hole 121a, and the direction in which the mixed gas flows out from the mixed gas outlet 10c is vertically downward. Thus, it is beneficial for the outflow of the mixed gas.

[0061] In some embodiments of the present invention, the air flow channel 10a is configured as a tapered air flow channel 10a. In other words, the cross-sectional area of the air flow channel 10a gradually decreases in the air flow direction. Thus, during the process of the air flowing in the air flow channel 10a, the flow velocity of the air gradually increases, thereby improving the mixing effect of the air and the gas.

[0062] In some embodiments of the present invention, as Figure 5As shown, a filter screen 13 is provided at the air inlet 10b. On the one hand, it can filter out debris mixed in the air, and on the other hand, it can prevent insects such as cockroaches from entering the air flow channel 10a, thus avoiding smoke faults. Preferably, the filter screen 13 can be made of metal material to improve the structural strength of the filter screen 13.

[0063] In some embodiments of the present invention, as Figure 3 and Figure 6 shown, a gas flow channel 23 is formed in the gas joint 20. The gas flow channel 23 communicates the gas inlet 21 and the gas outlet 22. The gas flow channel 23 is a variable cross-section flow channel, and the cross-section of the flow channel near the gas outlet 22 is smaller than the cross-section of the flow channel near the gas inlet 21.

[0064] Specifically, the gas flow channel 23 is defined by the interior of the gas joint 20. The gas flow channel 23 penetrates both ends of the gas joint 20 on the axis of the gas joint 20, and the central axis of the gas flow channel 23 is coaxially arranged with the central axis of the gas joint 20. The gas inlet 21 and the gas outlet 22 are respectively arranged at both ends of the gas flow channel 23. It should be noted that the "variable cross-section flow channel" means that the cross-sectional area of the gas flow channel 23 is not the same everywhere, that is, the cross-sectional area of the gas flow channel 23 changes in the axial direction of the gas flow channel 23, and the cross-sectional area of the gas flow channel 23 at the gas inlet 21 is larger than the cross-sectional area of the gas flow channel 23 at the gas outlet 22. Thus, the flow rate of the gas at the gas outlet 22 is greater than the flow rate at the gas inlet 21, thereby increasing the flow rate of the gas when it enters the air flow channel 10a, which is beneficial to improving the mixing effect of the gas and the air.

[0065] Optionally, the gas flow channel 23 includes an inlet section 231, an outlet section 233 and a transition section 232. The transition section 232 is connected between the inlet section 231 and the outlet section 233. The inlet section 231 is connected to the gas inlet 21, and the outlet section 233 is connected to the gas outlet 22. The cross-section of the flow channel of the inlet section 231 is larger than the cross-section of the flow channel of the outlet section 233. Thus, during the process of the gas passing through the gas flow channel 23, the speed of the gas flowing out from the gas outlet 22 is greater than the speed of the gas entering from the gas inlet 21, thereby increasing the flow rate of the gas entering the air flow channel 10a and further improving the mixing efficiency of the gas and the air.

[0066] Furthermore, the transition section 232 has a frustum-shaped peripheral surface with a gradually changing cross-section of the flow channel. It can be understood that the "cross-section of the flow channel" here refers to the cross-section obtained by intercepting the flow channel of the transition section 232 with a plane passing through its central axis. For example, the transition section 232 is a gradually shrinking flow channel, that is, the cross-sectional area of the transition section 232 changes gradually. Among them, the cross-sectional area of the upper end of the transition section 232 (i.e., the end connected to the inlet section 231) is larger than the cross-sectional area of the lower end of the transition section 232 (i.e., the end connected to the outlet section 233), and the cross-sectional area of the upper end of the transition section 232 is equal to the cross-sectional area of the inlet section 231, and the cross-sectional area of the lower end of the transition section 232 is equal to the cross-sectional area of the outlet section 233. Thus, the cross-sectional shape of the transition section 232 in its axial direction forms a frustum shape that is larger at the top and smaller at the bottom.

[0067] Preferably, the connection between the flow channel cross-section of the transition section 232 and the flow channel cross-section of the inlet section 231 and / or the connection between the flow channel cross-section of the transition section 232 and the flow channel cross-section of the inlet section 231 is a smooth transition. In other words, the connection between the flow channel cross-section of the transition section 232 and the flow channel cross-section of the inlet section 231 is a smooth transition, or the connection between the flow channel cross-section of the transition section 232 and the flow channel cross-section of the inlet section 231 is a smooth transition, or both the connection between the flow channel cross-section of the transition section 232 and the flow channel cross-section of the inlet section 231 and the connection between the flow channel cross-section of the transition section 232 and the flow channel cross-section of the inlet section 231 are smooth transitions. Thus, the resistance of the inner wall of the gas flow channel 23 to the gas can be reduced, and the flow of the gas in the gas flow channel 23 is smoother.

[0068] Furthermore, as Figure 3 and Figure 6 shown, the inlet section 231 and the transition section 232 are located outside the air flow channel 10a, the outlet section 233 penetrates through the wall of the cover plate 10 and extends into the air flow channel 10a, a flange 24 is provided on the outer peripheral surface of the transition section 232, and the flange 24 is fixedly attached to the outer wall surface of the cover plate 10. It can be understood that the flange described above is formed on the flange 24, the outlet section 233 extends into the air flow channel 10a through the mounting hole 121a, the flange is supported on the mounting plane 121b of the top plate portion, and the flange and the mounting plane 121b are connected by fasteners. Preferably, the flange 24 and the gas joint 20 are integrally formed, thus eliminating the assembly process between the flange 24 and the gas joint 20, and the processing and manufacturing are relatively convenient.

[0069] In some specific embodiments of the present invention, as Figure 3 and Figure 6As shown, the gas outlet 22 penetrates through the circumferential wall of the outlet section 233 to form a circumferential gas outlet 221. The circumferential gas outlets 221 are multiple and are arranged at intervals along the circumference of the outlet section 233. Specifically, the opening direction of each circumferential gas outlet 221 is in the radial direction of the outlet section 233, and the multiple circumferential gas outlets 221 are equally spaced along the circumference of the outlet section 233. Thus, after the gas is split by the multiple circumferential gas outlets 221, it flows out evenly radially outward along the outlet section 233, so that the mixing of the gas and air is more uniform and the mixing efficiency is higher.

[0070] Optionally, continuing to refer to Figure 3 and Figure 6 the embodiment shown, the gas outlet 22 further includes an end gas outlet 222. The end gas outlet 222 is provided at the free end of the outlet section 233, and the end gas outlet 222 is open along the axial direction of the outlet section 233. It can be understood that the free end of the outlet section 233 is the lower end of the outlet section 233, and the opening direction of the end gas outlet 222 is downward along the axial direction of the outlet section 233. Thus, part of the gas can enter the air flow passage 10a along the axial direction of the outlet section 233 through the end gas outlet 222, thereby further improving the splitting effect of the gas outlet 22 on the gas, and the mixing efficiency of the gas and air is higher.

[0071] Optionally, as Figure 4 shown, the circumferential gas outlet 221 has a rounded structure 221a that can reduce the gas flow resistance. Specifically, the rounded structure 221a is formed at the connection between the inner circumferential wall of the circumferential gas outlet 221 and the inner circumferential wall of the outlet section 233, and the rounded structure 221a is formed by rounding the connection. Thus, a smooth transition is formed at the edge of the circumferential gas outlet 221, which can avoid generating noise when the gas passes through the edge of the circumferential gas outlet 221, thereby achieving a noise reduction effect.

[0072] Optionally, continuing to refer to Figure 4 the embodiment shown, an annular protrusion 25 is provided on the inner circumferential surface of the outlet section 233. The annular protrusion 25 is located between the circumferential gas outlet 221 and the end face of the free end of the outlet section 233, and the end gas outlet 222 is defined by the annular protrusion 25. In this way, the cross-sectional area of the end gas outlet 222 is smaller than the cross-sectional area of the outlet section 233, and the flow rate of the gas flowing out from the end gas outlet 222 is greater, thereby further improving the mixing efficiency of the gas and air, and the high-speed outflow of the gas from the end gas outlet 222 in the vertically downward direction is beneficial to the discharge of the mixed gas from the mixed gas outlet 10c.

[0073] Further, the annular protrusion 25 has a smooth and arc-shaped gas flow surface 25a. Thus, the resistance of the gas passing through the gas flow surface 25a is small, the friction between the gas and the gas flow surface 25a can be reduced, the gas flow is smoother, and the wind noise can be reduced.

[0074] Next, a specific embodiment of the present invention will be described in detail with reference to Figures 1-6 the following.

[0075] As Figures 1-6 shown, the premixed air inlet structure 100 includes a cover plate 10 and a gas connector 20.

[0076] A tapered air flow channel 10a is formed in the cover plate 10. An air inlet 10b and a mixture gas outlet 10c are provided on the cover plate 10. The air inlet 10b and the mixture gas outlet 10c are respectively communicated with the air flow channel 10a. The gas connector 20 is installed on the cover plate 10. The gas connector 20 has a gas inlet 21 and a gas outlet 22. A gas flow channel 23 communicating the gas inlet 21 and the gas outlet 22 is defined in the gas connector 20. Among them, the gas inlet 21 is located outside the air flow channel 10a, the gas outlet 22 extends into the air flow channel 10a, the number of the gas outlets 22 is multiple, and the orientations of at least a part of the gas outlets 22 are different.

[0077] The gas connector 20 is arranged perpendicular to the air flow channel 10a. The air inlet 10b is perpendicular to the gas connector 20. The orientation of the mixture gas outlet 10c is the same as the length direction of the gas connector 20. Among them, a filter screen 13 is provided at the air inlet 10b.

[0078] The gas flow channel 23 includes an inlet section 231, an outlet section 233 and a transition section 232. The transition section 232 is connected between the inlet section 231 and the outlet section 233. The inlet section 231 is connected to the gas inlet 21. The outlet section 233 is connected to the gas outlet 22. Among them, the cross-sectional area of the inlet section 231 is larger than the cross-sectional area of the outlet section 233. The transition section 232 is a frustum-shaped circumferential surface with a gradually changing flow channel cross-section. The inlet section 231 and the transition section 232 are located outside the air flow channel 10a. The outlet section 233 passes through the wall of the cover plate 10 and extends into the air flow channel 10a. A flange 24 is provided on the outer circumferential surface of the transition section 232. An installation plane is provided on the outer wall surface of the cover plate 10. The flange 24 is fixedly attached to the installation plane.

[0079] The gas outlet 22 includes a circumferential gas outlet 221 and an end gas outlet 222. The circumferential gas outlet 221 penetrates the circumferential wall of the outlet section 233 and has a rounded structure 221a that can reduce the gas flow resistance. The circumferential gas outlets 221 are multiple and are arranged at intervals along the circumference of the outlet section 233. The end gas outlet 222 is provided at the free end of the outlet section 233, and the end gas outlet 222 is arranged to be axially open along the outlet section 233. An annular protrusion 25 is provided on the inner circumferential surface of the outlet section 233. The annular protrusion 25 is located between the circumferential gas outlet 221 and the end face of the free end of the outlet section 233. The end gas outlet 222 is defined by the annular protrusion 25, and the annular protrusion 25 has a smooth and arc-shaped gas flow surface 25a.

[0080] The cover plate 10 includes a cover plate body 11 and an air duct plate 12. The air duct plate 12 is provided on the cover plate body 11 to define an air flow passage 10a therebetween. The air duct cover plate 10 includes an upper plate portion 121 and a circumferential wall plate 122. The circumferential wall plate 122 connects the upper plate portion 121 and the cover plate body 11, and the connection between the circumferential wall plate 122 and the upper plate portion 121 has a smooth transition. The air duct cover plate 10 has a fan-shaped cross-section, and the air inlet 10b is formed on the outer arc side of the air duct cover plate 10 away from the center of the circle. Among them, the gas outlet 22 is located within the central region corresponding to the air duct cover plate 10.

[0081] The gas water heater according to the second aspect embodiment of the present invention includes the premixed air intake structure 100 according to the first aspect embodiment of the present invention.

[0082] The gas water heater according to the embodiment of the present invention, by using the premixed air intake structure 100 according to the first aspect embodiment of the present invention, has the advantages of sufficient gas combustion, energy conservation and environmental protection, etc.

[0083] The other components and operations of the premixed air intake structure 100 according to the embodiment of the present invention and the gas water heater having the same are known to those of ordinary skill in the art, and will not be described in detail here.

[0084] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0085] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A premixed air inlet structure, characterized in that, it includes: A cover plate, an air flow channel is formed inside the cover plate, an air inlet and a mixture gas outlet are arranged on the cover plate, and the air inlet and the mixture gas outlet are respectively communicated with the air flow channel; A gas connector, the gas connector is installed on the cover plate, the gas connector has a gas inlet and a gas outlet, the gas outlet extends into the air flow channel, the gas outlets are multiple and the orientations of at least a part of the gas outlets are different; The cover plate includes: a cover plate body and an air duct plate arranged on the cover plate body, and the air duct plate and the cover plate body define the air flow channel therebetween; The air duct plate has a fan-shaped cross-section, and the air inlet is formed on the outer arc side of the air duct plate away from the center of the circle; The air duct plate includes: an upper plate portion and a peripheral wall plate, the peripheral wall plate connects the upper plate portion and the cover plate body, and the connection between the peripheral wall plate and the upper plate portion is smoothly transitioned.

2. The premixed air inlet structure according to claim 1, characterized in that, a gas flow channel is formed inside the gas connector, the gas flow channel communicates the gas inlet and the gas outlet, the gas flow channel is a variable-diameter flow channel and the cross-section of the flow channel near the gas outlet is smaller than the cross-section of the flow channel near the gas inlet.

3. The premixed air inlet structure according to claim 2, characterized in that, the gas flow channel includes: an inlet section, an outlet section and a transition section, the transition section is connected between the inlet section and the outlet section, the inlet section is connected to the gas inlet, the outlet section is connected to the gas outlet, and the cross-section of the flow channel of the inlet section is larger than the cross-section of the flow channel of the outlet section.

4. The premixed air inlet structure according to claim 3, characterized in that, the transition section is a frustum-shaped circumferential surface with a gradually changing cross-section of the flow channel.

5. The premixed air inlet structure according to claim 3, characterized in that, the inlet section and the transition section are located outside the air flow channel, the outlet section passes through the wall of the cover plate and extends into the air flow channel, a flange is arranged on the outer circumferential surface of the transition section, and the flange is fixedly attached to the outer wall surface of the cover plate.

6. The premixed air inlet structure according to claim 3, characterized in that, the gas outlet penetrates through the circumferential wall of the outlet section to form a circumferential gas outlet, the circumferential gas outlets are multiple and are arranged at intervals along the circumferential direction of the outlet section.

7. The premixed air inlet structure according to claim 6, characterized in that, the gas outlet further includes: an end gas outlet, the end gas outlet is arranged at the free end of the outlet section, and the end gas outlet is open along the axial direction of the outlet section.

8. The premixed air inlet structure according to claim 7, characterized in that, an annular protrusion is arranged on the inner circumferential surface of the outlet section, the annular protrusion is located between the circumferential gas outlet and the end face of the free end of the outlet section, and the end gas outlet is defined by the annular protrusion.

9. The premixed air inlet structure according to claim 8, characterized in that, the annular protrusion has a smooth and arc-shaped gas flow surface.

10. The premixed air inlet structure according to claim 6, characterized in that, the circumferential gas outlet has a rounded structure capable of reducing the gas flow resistance.

11. The premixed air inlet structure according to claim 1, characterized in that, the gas outlet is within the central region corresponding to the air duct plate.

12. The premixed air inlet structure according to claim 1, characterized in that, the gas connector is arranged perpendicular to the air flow channel, the air inlet is perpendicular to the gas connector, and the orientation of the mixed gas outlet is the same as the length direction of the gas connector.

13. The premixed air inlet structure according to claim 1, characterized in that, the air flow channel is configured as a tapered air flow channel.

14. The premixed air inlet structure according to claim 1, characterized in that, a filter screen is provided at the air inlet.

15. A gas water heater, characterized in that, it includes the premixed air inlet structure according to any one of claims 1-14.

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