Mixing device, gas mixing system, combustion system and water heater

Abstract

The application provides a mixed flow device, a gas mixing system, a combustion system and a water heater. The mixed flow device comprises a shell which encloses an inner mixed flow cavity. One end of the shell is provided with a gas mixing inlet which is suitable for introducing mixed gas into the inner mixed flow cavity. A plurality of shunt holes are arranged on the side wall of the shell and are suitable for guiding the mixed gas in the inner mixed flow cavity out. The mixed flow device encloses the inner mixed flow cavity by the shell and is provided with a plurality of shunt holes which are in communication with the inner mixed flow cavity. Therefore, the mixed gas can be mixed in the inner mixed flow cavity, and the mixing uniformity of the mixed gas is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas supply device, in particular to a mixing device, a gas mixing system, a combustion system and a water heater. BACKGROUND

[0002] Gas heating stoves and gas water heaters usually use gas for heating, and the gas enters the combustion chamber through the gas system for combustion.

[0003] At present, full premix combustion technology has been widely used, but the uniformity of natural gas and air mixing needs to be further improved. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defect of poor mixing uniformity of mixed gas in the prior art, so as to provide a mixing device which can improve the mixing uniformity of mixed gas.

[0005] In order to solve the above technical problems, the present application provides a mixing device, which comprises: a shell which encloses an inner mixing cavity, one end of the shell is provided with a gas mixing inlet which is suitable for introducing mixed gas into the inner mixing cavity; wherein a plurality of shunt holes are arranged on the side wall of the shell, and the shunt holes are suitable for guiding the mixed gas in the inner mixing cavity out.

[0006] Optionally, the mixing device further comprises: at least one guide vane arranged in the inner mixing cavity, and the guide vane is connected with the shell, and the guide vane is suitable for separating at least two adjacent guide cavities in the inner mixing cavity along a first direction; wherein a gas flow passage is arranged on the guide vane to enable the two adjacent guide cavities to communicate with each other.

[0007] Optionally, the mixing device comprises: at least two guide vanes, and the at least two guide vanes are arranged along the first direction, and the projection area of one of the flow passages is less than or equal to the projection area of the other flow passages along the first direction.

[0008] Optionally, the projection area of the at least two flow passages gradually decreases along the first direction.

[0009] Optionally, the guide vane is in a conical structure.

[0010] Optionally, the shell is in a cylindrical or conical cylindrical shape, and one end of the cylindrical or conical cylindrical shape is open to form the gas mixing inlet.

[0011] Optionally, a guide plate is arranged on the shell near the shunt hole or at the shunt hole of the shell and is inclined away from the shell.

[0012] Optionally, the plurality of the shunt holes are staggered along the first direction.

[0013] Optionally, the distance between two adjacent shunt holes is the same in the circumferential direction of the side wall of the shell.

[0014] Therefore, the present application aims to overcome the defect of poor mixing uniformity of mixed gas in the prior art, and provide a gas mixing system capable of improving the mixing uniformity of mixed gas.

[0015] To solve the above technical problems, the present application provides a gas mixing system, comprising: a flow converging device, which encloses a flow converging cavity with a Venturi structure, the flow converging cavity having a gas outlet end, a first gas inlet end through which a first gas can be introduced, and a second gas inlet end through which a second gas can be introduced; and any one of the flow mixing devices, which is arranged in the flow converging cavity ； The inner flow mixing cavity of the flow mixing device is in communication with the flow converging cavity through the shunt hole.

[0016] Optionally, the gas mixing system further comprises a fixed sheet ， The fixed sheet is arranged at the gas outlet end, and a plurality of gas outlets in communication with the flow converging cavity are arranged on the fixed sheet; and the shell of the flow mixing device is connected with the fixed sheet.

[0017] Therefore, the present application aims to overcome the defect of poor mixing uniformity of mixed gas in the prior art, and provide a gas mixing system capable of improving the mixing uniformity of mixed gas.

[0018] To solve the above technical problems, the present application provides a gas mixing system, comprising: a flow converging device, which encloses a flow converging cavity with a Venturi structure, the flow converging cavity having a gas outlet end, a first gas inlet end through which a first gas can be introduced, and a second gas inlet end through which a second gas can be introduced; and any one of the flow mixing devices, which is arranged in the flow converging cavity

[0019] Therefore, the present application aims to overcome the defect of poor mixing uniformity of mixed gas in the prior art, and provide a gas mixing system capable of improving the mixing uniformity of mixed gas.

[0020] To solve the above technical problems, the present application provides a gas mixing system, comprising: a flow converging device, which encloses a flow converging cavity with a Venturi structure, the flow converging cavity having a gas outlet end, a first gas inlet end through which a first gas can be introduced, and a second gas inlet end through which a second gas can be introduced; and any one of the flow mixing devices, which is arranged in the flow converging cavity

[0021] The present application has the following advantages:

[0022] 1. The mixing device provided by the present application, which comprises a shell, an inner mixing cavity enclosed by the shell, and a plurality of shunt holes provided on the shell and communicating with the inner mixing cavity, so that the mixed gas can be mixed in the inner mixing cavity, and the mixing uniformity of the mixed gas is improved.

[0023] 2. The mixing device provided by the present application, which comprises a flow guide piece provided with a gas flow port and separating the inner mixing cavity into at least two flow guide cavities in communication with each other, so that the mixed gas reaches a uniform state after passing through the plurality of flow guide cavities in stages, and the mixing uniformity of the mixed gas is further improved.

[0024] 3. The mixing device provided by the present application, which comprises a plurality of shunt holes staggered in the first direction on the shell, so that the mixing effect is better, and the mixed gas is more uniformly mixed.

[0025] 4. The mixing device provided by the present application, which comprises a flow guide plate capable of guiding the mixed gas flowing out of the shunt hole, so that the mixed gas is further more uniformly mixed.

[0026] 5. The mixing device provided by the present application, which comprises a flow guide piece in an inverted conical structure, so that the turbulence effect is better.

[0027] 6. The gas mixing system provided by the present application, which comprises a mixing device arranged in a flow collection cavity, so that the mixed gas can form turbulence in the mixing device, and the uniformity of the mixed gas is provided.

[0028] 7. The gas mixing system provided by the present application, under the action of a Venturi structure of a flow collection device, the pressure of a throat section of the flow collection cavity becomes smaller, and a gas flow phenomenon from a second air inlet end to the throat section of the flow collection cavity occurs, so that the gas can enter the flow collection cavity more quickly under the action force, and the air and the gas converge together and flow to an air outlet end at the throat section.

[0029] 8. The combustion system provided by the present application, which can reduce the safety performance requirement of a fan and reduce the manufacturing cost of the fan.

[0030] 9. The water heater provided by the present application, which comprises the above-mentioned combustion system, and the combustion effect is improved.

[0031] 10. The water heater provided by the present application, which has high electrical safety of premixing at the rear end of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0033] Figure 1 A cross-sectional view of a mixing device according to an embodiment of the present application;

[0034] Figure 2 A perspective view of a mixing device according to an embodiment of the present application;

[0035] Figure 3 An exploded view of a mixing device according to an embodiment of the present application;

[0036] Figure 4 An exploded view of a gas mixing system according to an embodiment of the present application;

[0037] Figure 5 A perspective view of a gas mixing system according to an embodiment of the present application;

[0038] Figure 6 A cross-sectional view of a gas mixing system according to an embodiment of the present application;

[0039] Figure 7 A top view of a gas mixing system according to an embodiment of the present application;

[0040] Figure 8 A front view of a flow converging device of a gas mixing system according to an embodiment of the present application;

[0041] Figure 9 A top view of a flow converging device of a gas mixing system according to an embodiment of the present application;

[0042] Figure 10 A bottom view of a flow converging device of a gas mixing system according to an embodiment of the present application;

[0043] Figure 11 A perspective view of a combustion system according to an embodiment of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS

[0045] 1 - air supply device; 2 - flow converging device; 3 - mixing device; 4 - combustion chamber;

[0046] 101 - air outlet;

[0047] 21 - fixed plate;

[0048] 201 - flow converging cavity; 202 - first air inlet end; 203 - second air inlet end; 204 - air outlet end;

[0049] 205 - gas outlet; 206 - outer mixing cavity;

[0050] 31 - housing; 32 - guide vane; 33 - guide plate;

[0051] 301 - guide cavity; 302 - shunt hole; 303 - inner mixing cavity; 304 - gas mixing inlet. DETAILED DESCRIPTION

[0052] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0053] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0056] According to the premixing mode of the gas, it can be divided into fan front-end premixing and fan rear-end premixing. When the fan front-end premixing mode is adopted, the sealing property of the fan will have very high requirements, which will affect the uniformity of the mixing of the gas and the space, and make the manufacturing cost of the fan very high.

[0057] Example 1

[0058] As Figures 1 to 3The mixing device 3 shown includes a housing 31 enclosing an inner mixing cavity 303, one end of the housing 31 is provided with a gas mixing inlet 304, which is suitable for introducing mixed gas into the inner mixing cavity 303, wherein a plurality of shunt holes 302 are provided on the side wall of the housing 31, and the shunt holes 302 are suitable for guiding the mixed gas in the inner mixing cavity 303 out.

[0059] The housing 31 described above includes a side wall and a top, the top and side wall of the housing 31 enclose the inner mixing cavity 303, the inner mixing cavity 303 has a gas mixing inlet 304, and part of the housing 31 is arranged opposite to the gas mixing inlet 304. Among them, a plurality of shunt holes 302 are arranged in sequence and spaced apart around the inner mixing cavity 303 on the housing 31, and the gas mixing inlet 304 is suitable for introducing mixed gas into the inner mixing cavity 303. The top of the housing 31 is arranged opposite to the gas mixing inlet 304, the mixed gas enters the inner mixing cavity 303 through the gas mixing inlet 304 for mixing, and then flows out from the shunt holes 302, so that the mixing of the gas tends to be uniform. Among them, the top of the housing 31 plays a role in guiding the mixed gas entering the inner mixing cavity 303, so that the airflow of the mixed gas turns back after reaching the top and flows out from the shunt holes 302 arranged on the housing 31, which can further play a role in mixing.

[0060] Further, continuing to combine Figure 1 and Figure 3 As shown, the mixing device 3 further includes at least one flow guide vane 32, the flow guide vane 32 is arranged in the inner mixing cavity 303, and the flow guide vane 32 is connected with the housing 31, the flow guide vane 32 is suitable for dividing at least two flow guide cavities 301 in the inner mixing cavity 303 along the first direction Y. Among them, the flow guide vane 32 is provided with a gas flow passage 305 to enable the adjacent two flow guide cavities 301 to communicate with each other.

[0061] The housing 31 described above is provided with a plurality of shunt holes 302 in sequence and spaced apart around the corresponding flow guide cavities 301, and each flow guide cavity 301 is provided with shunt holes 302 on the side wall of the corresponding housing 31, the edge of the flow guide vane 32 can be connected with the housing 31, and the flow guide vane 32 plays a role in guiding the gas entering the corresponding flow guide cavity 301, so that after the airflow of the mixed gas further contacts the flow guide vane 32, part of the mixed gas flows out from the shunt holes 302 corresponding to the flow guide cavity 301 where the mixed gas is located, and another part of the mixed gas enters the adjacent flow guide cavity 301 along the first direction Y through the gas flow passage 305 for further mixing. Therefore, by arranging the flow guide vane 32, the mixed gas can be further mixed uniformly.

[0062] The above-mentioned mixed flow device 3 constitutes a turbulence device, and the guide vanes 32 can form layered turbulence devices. Under the action of the layered turbulence devices, the mixed gas is dispersed and sprayed from each of the flow holes 302 after multiple turbulent flows, so that the two laminar gases become turbulent mixed gas, and the mixing effect of the mixed gas can be enhanced.

[0063] Further, the above-mentioned mixed flow device 3 is combined with the above-mentioned gas mixing device 1. Figure 1 As shown in the figure, the mixed flow device includes at least two guide vanes 32, and the at least two guide vanes 32 are arranged along the first direction Y, and the projection area of one of the flow passages 305 along the first direction Y is less than or equal to the projection area of the other flow passages 305 along the first direction Y.

[0064] As shown in the figure, the above-mentioned mixed flow device 3 is combined with the above-mentioned gas mixing device 1. Figure 1 As shown in the figure, the above-mentioned shell 31 and the plurality of guide vanes 32 can form a plurality of turbulence guide cavities 301, and the mixing effect is good. The guide vanes 32 can be fixed on the shell 31 by welding, and are used for guiding and mixing the gas sprayed from each of the flow holes 302.

[0065] Among them, the guide vanes 32 can be arranged at two in the inner mixed flow cavity 303 along the first direction Y. For the convenience of description, they can be respectively named as the first guide vane and the second guide vane. Among them, the guide vane 32 close to the gas mixing inlet 304 is the first guide vane, and the guide vane 32 away from the gas mixing inlet 304 is the second guide vane. The projection area of the gas flow passage 305 of the first guide vane along the first direction Y is greater than the projection area of the gas flow passage 305 of the second guide vane along the first direction Y, so that the mixed gas can flow more into the guide cavity 301 enclosed between the first guide vane and the second guide vane, and the residence time and the walking path of the mixed gas in the inner mixed flow cavity 303 are increased, thereby further improving the uniformity of the mixed gas. Of course, as an alternative embodiment, the projection area of the gas flow passage 305 of the first guide vane along the first direction Y is equal to the projection area of the gas flow passage 305 of the second guide vane along the first direction Y, and the uniform mixing of the gas can also be realized 。

[0066] Specifically, the first and second guide vanes correspond to form three guide cavities 301 in the first direction Y in the inner mixing cavity 303. The mixed gas passes through the three turbulent flows and is sprayed from the corresponding each flow hole 302, so that the two laminar flows become turbulent mixed gas, and the mixing effect of the mixed gas is enhanced. Among them, after the mixed gas enters the first guide cavity, part of the mixed gas enters the second guide cavity through the gas flow port 305 on the first guide vane 32, and the other part of the mixed gas enters the outer mixing cavity 206 through the flow hole 302 corresponding to the first guide cavity, forming the first layer of turbulent flow; the mixed gas entering the second guide cavity part enters the third guide cavity through the gas flow port 305 on the second guide vane, and the other part enters the outer mixing cavity 206 through the flow hole 302 corresponding to the second guide cavity, forming the second layer of turbulent flow; the mixed gas entering the third guide cavity directly enters the outer mixing cavity 206 through the flow hole 302 corresponding to the third guide cavity, forming the third layer of turbulent flow. The mixed gas is mixed for the first time after entering the converging section of the converging cavity 201. Since the mixing device 3 is arranged in the converging section of the converging cavity 201, the mixed gas is mixed for the second time after passing through the first, second and third layers of turbulent flow of the turbulent flow device, so that the gas and air are more uniformly mixed and the combustion is more complete.

[0067] As an alternative embodiment, the number of guide vanes 32 can be one, three, and so on. Of course, as an alternative embodiment, the guide vanes 32 can also not be provided, and there is only one inner mixing cavity 303 in the shell 31. At least part of the mixed gas enters the inner mixing cavity 303, and then flows through the flow hole 302 to enter the outer mixing cavity 206 for secondary mixing.

[0068] Among them, when the mixed gas enters the layered turbulent flow device, the gas close to the inner wall of the gas inlet of the shell 31 will be intercepted and guided by the corresponding guide vane 32 first. The gas will change direction and the air and gas will be further mixed, from laminar flow to turbulent flow, and sprayed from the corresponding flow hole 302. Because the number of flow holes 302 is limited, the guide vane 32 can intercept the whole circle of mixed gas, and the excess gas that has not been sprayed is further mixed in the first layer of guide cavity 301 and affects the subsequent laminar mixed gas, changing its state, which is the first layer of turbulent effect. Similarly, the second layer of turbulent effect is realized by another guide vane 32, which intercepts the mixed gas in the middle of the layered turbulent flow device, and the principle is the same as that of the first layer of guide vane. The third layer is the central mixed gas of the layered turbulent flow device, which is intercepted by the top of the layered turbulent flow device to change the state of the gas flow, and the principle is the same as that of the guide vane 32, forming three times of mixing.

[0069] Further, the projection area of at least two flow ports 305 gradually decreases along the first direction Y.

[0070] Further, continue to combine Figure 1 and Figure 3 As shown, the guide vane 32 is in a conical structure.

[0071] The shell 31 is in a cylindrical or conical column structure, one end of which is open and suitable for forming a mixed gas inlet 304.

[0072] The above-mentioned shell 31 is in a cylindrical structure, and the end of the cylindrical shell 31 away from the top forms an opening suitable for forming a mixed gas inlet 304. The guide vane 32 can be in an inverted conical structure, which has better turbulence effect. Among them, after the mixed gas enters the mixed gas inlet 304, it will be intercepted by the guide vane 32 close to the mixed gas inlet 304, that is, the first guide vane, the gas will change direction and further mix, from laminar flow to turbulent flow, which is the first layer of turbulent flow effect. Similarly, the second layer of turbulent flow effect is realized by the second guide vane, which intercepts the mixed gas entering the second guide cavity, and the principle is the same as the first guide vane, forming the second layer of turbulent flow effect. The third layer is intercepted by the top of the shell 31 to change the state of the gas flow, and the principle is the same as the guide vane 32, forming three times of mixing.

[0073] The shell 31 can also be an elliptical cylinder, a cone, a square, a rectangular or an irregular column, as long as the mixed flow device 3 surrounds a cavity.

[0074] Further, the guide plate 33 is provided at the position close to the shunt hole 302 of the shell 31 or at the shunt hole 302 of the shell 31 and is inclined away from the shell 31.

[0075] The above-mentioned guide plate 33 can play a role of guiding the mixed gas flowing out of the shunt hole 302, and can further make the mixed gas more uniform. The included angle α formed by the central axis L1 of the guide plate 33 and the central axis L2 of the mixed flow device 3 is an acute angle, that is, the guide plate 33 is inclined upward away from the shell 31. As an alternative embodiment, the included angle α formed by the central axis L1 of the guide plate 33 and the central axis L2 of the mixed flow device 3 can also be an obtuse angle, that is, the guide plate 33 is inclined downward away from the shell 31.

[0076] Further, a plurality of shunt holes 302 are staggered in the first direction Y, specifically, as shown in Figure 2 and Figure 3 In the first direction Y, the projections of the adjacent two shunt holes 302 on the plane perpendicular to the first direction Y can partially overlap, so that the mixing is more uniform.

[0077] Further, the distance between the adjacent two shunt holes 302 is the same in the circumferential direction of the side wall of the shell 31, and as shown in Figure 2 and Figure 3The mixing is more uniform.

[0078] Embodiment 2

[0079] As Figures 4 to 10 shown in the gas mixing system, the gas mixing system comprises the flow converging device 2 and the gas mixing device 3 of any one of the embodiments. The flow converging device 2 encloses a flow converging cavity 201 with a Venturi structure. The flow converging cavity 201 has a gas outlet end 204, a first gas inlet end 202 through which the first gas can enter, and a second gas inlet end 203 through which the second gas can enter. The gas mixing device 3 is arranged in the flow converging cavity 201. The inner mixing cavity 303 of the gas mixing device 3 is in communication with the flow converging cavity 201 through the flow dividing hole 302.

[0080] Continuing to refer to Figure 4 and Figure 6 shown in the drawings, the gas mixing device 3 is arranged at the gas outlet end 204 of the flow converging cavity 201. The first gas can enter the flow converging cavity 201 through the first gas inlet end 202. The second gas enters the flow converging cavity 201 from the second gas inlet end 203. The first gas and the second gas are premixed in the flow converging cavity 201 for the first time, and then flow together to the gas outlet end 204. When the mixed gas further flows to the gas mixing inlet 304 of the gas mixing device 3, the mixed gas is further mixed in the gas mixing device 3 for the second time. The two-stage mixing has a better mixing effect, thereby achieving the uniformity of the mixed gas.

[0081] Further, referring to Figure 5 and Figure 7 shown in the drawings, the gas mixing system further comprises a fixed plate 21 ， The fixed plate 21 is arranged at the gas outlet end 204. The fixed plate 21 is provided with a plurality of gas outlets 205 in communication with the flow converging cavity 201. The shell 31 of the gas mixing device 3 is connected with the fixed plate 21. The shell 31 、 The fixed plate 21 and the outer shell of the flow converging device 2 jointly enclose an annular outer mixing cavity 206. The plurality of flow guide cavities 301 of the flow converging device 2 are respectively in communication with the outer mixing cavity 206. The gas outlets 205 are arranged at positions in communication with the outer mixing cavity 206.

[0082] The fixed plate 21 can be connected with the end face of the gas outlet end 204 by screws, or can be welded or riveted. The top of the shell 31 of the gas mixing device 3 is provided with a connecting hole. The center of the fixed plate 21 is provided with a through hole. A connecting member is connected with the connecting hole in the top of the shell 31 and the through hole of the fixed plate 21. The connecting member can be a screw, a bolt or a buckle. Of course, the top of the gas mixing device 3 can also be welded with the fixed plate 21.

[0083] The top of the mixing device 3 is blocked, and the mixed gas flow enters the outer mixing chamber 206 from the corresponding flow guide cavity 301 and the flow dividing hole 302 after turning back at the top of the mixing device 3, which can provide uniformity of the mixed gas entering the outer mixing chamber 206. The connecting hole is arranged in the middle of the top surface of the mixing device 3, and a plurality of gas outlets 205 can be arranged around the connecting hole, and the gas outlets 205 can be arranged correspondingly with the outer mixing chamber 206.

[0084] The fixed sheet 21 described above can guide and divide the mixed gas entering the outer mixing chamber 206, and the gas outlets 205 are arranged on the periphery of the projection of the shell 31 on the plane perpendicular to the first direction Y, so that the gas outlets 205 are in communication with the outer mixing chamber 206. Under the flow dividing effect of the fixed sheet 21, the mixed gas of the first gas and the second gas flows out of the outer mixing chamber 206 in a uniform manner.

[0085] Specifically, as shown in Figure 6 The flow collecting cavity 201 of the flow collecting device 2 can include three parts: an air inlet part, an intermediate part and an air outlet part, the air inlet part is provided with a first air inlet end 202, the first air inlet end 202 has a cuboid structure, and the air outlet 101 partially extends into the first air inlet end 202, and the air outlet 101 and the first air inlet end 202 can be connected by screws.

[0086] Further, continuing to combine Figure 6 The flow collecting cavity 201 includes a Venturi structure with an absorption section, a throat section and a diffuser section. The projection area of the absorption section of the flow collecting cavity 201 along the first direction Y gradually decreases, the projection area of the throat section of the flow collecting cavity 201 along the first direction Y is constant, and the projection area of the diffuser section of the flow collecting cavity 201 along the first direction Y gradually increases.

[0087] The throat section of the flow collecting cavity 201 described above is provided with a second air inlet end 203, and the second air inlet end 203 can extend in the second direction X, and the second direction X and the second direction Y can be perpendicular to each other. Under the action of the Venturi structure, the pressure of the middle section of the flow collecting cavity 201 decreases, and the airflow phenomenon of flowing from the second air inlet end 203 to the throat section of the flow collecting cavity 201 occurs, and the second gas can enter the flow collecting cavity 201 more quickly under the action of the force. At the throat section position, the second gas converges with the first gas and flows to the air outlet end 204 together.

[0088] The gap between the outer wall of the mixing device 3 and the inner cavity wall of the flow collecting cavity 201, wherein one end of the flow collecting cavity 201 close to the air outlet end 204 is a trumpet-shaped diffuser section, as Figure 9 and Figure 10As shown, the mixed gas entering the flow guide cavity 301 of the flow mixing device 3 re-enters the outer mixing flow cavity 206 for further mixing, so that the mixing of the first gas and the second gas is more sufficient. Among them, after the mixed gas enters the first flow guide cavity, part of the mixed gas enters the second flow guide cavity through the gas flow-through port 305 on the first flow guide fin, and the other part of the mixed gas enters the outer mixing flow cavity 206 through the shunt hole 302 corresponding to the first flow guide cavity, forming a first layer of turbulent flow; the mixed gas entering the second flow guide cavity part enters the third flow guide cavity through the gas flow-through port 305 on the second flow guide fin, and the other part enters the outer mixing flow cavity 206 through the shunt hole 302 corresponding to the second flow guide cavity, forming a second layer of turbulent flow; the mixed gas entering the third flow guide cavity directly enters the outer mixing flow cavity 206 through the shunt hole 302 corresponding to the third flow guide cavity, forming a third layer of turbulent flow. After the mixed gas is mixed for the first time through the throat section of the flow convergence cavity 201, it re-enters the diffuser section of the flow convergence cavity 201. Since the flow mixing device 3 is arranged at the diffuser section of the flow convergence cavity 201, after the gas mixed once passes through the first layer, the second layer, and the third layer of the flow turbulator, the secondary mixing of the mixed gas is realized, so that the gas and air are mixed more uniformly and the combustion is more sufficient.

[0089] As an alternative embodiment, the number of flow guide fins 32 can be one, three, and the like, which are not listed one by one. Of course, as an alternative embodiment, the flow guide fin 32 can also not be arranged, and there is only one inner mixing flow cavity 303 in the shell 31. At least part of the mixed gas enters the inner mixing flow cavity 303, and then flows through the shunt hole 302 into the outer mixing flow cavity 206 for secondary mixing.

[0090] At the same time, the plurality of shunt holes 302 are uniformly distributed in a spiral shape with the first direction Y as the axis. It can be understood that the plurality of shunt holes 302 arranged from bottom to top in the shell 31, the center lines of the plurality of shunt holes are spiral lines, so that the plurality of shunt holes 302 are staggered in the first direction Y, and the mixed gas can more uniformly fill the gas outlet end 204 of the flow convergence device 2, further enhancing the turbulent effect, and finally achieving efficient mixing, and then uniformly entering the combustion chamber 4 through the gas outlet 205 on the fixed fin 21, realizing efficient combustion.

[0091] Further, along the first direction Y, the first gas inlet end 202 is arranged opposite to the gas outlet end 204, and the plurality of flow guide cavities 301 are arranged in layers in the direction from the first gas inlet end 202 to the gas outlet end 204, so that the mixed gas is mixed more sufficiently.

[0092] Embodiment 3

[0093] As Figure 11The combustion system comprises a gas valve, a mixing system, a wind supply device 1 and a combustion chamber 4. The gas valve has an air inlet and an air outlet, the air inlet is connected with a gas pipeline, the second air inlet end 203 of the mixing system is connected with the air outlet, the wind supply device 1 is connected with the first air inlet end 202 of the mixing system, and the combustion chamber 4 is connected with the air outlet end 204 of the mixing system.

[0094] The wind supply device 1 can be a fan, which provides mixed power and clean air for gas mixing and combustion. Under the action of the wind supply device 1, air enters the inside of the wind supply device 1 from the air inlet of the wind supply device 1 and enters the first air inlet end 202 of the flow collecting device 2 from the air outlet 101 of the wind supply device 1, and then enters the flow collecting cavity 201. The gas enters the flow collecting cavity 201 of the flow collecting device 2 from the second air inlet end 203, and the gas and air are mixed in the flow collecting cavity 201 and flow to the air outlet end 204 together. It can be seen that the first gas is air and the second gas is gas. The mixed gas is further mixed in multiple flow guide cavities 301, and is more and more uniform, and then is uniformly sprayed from the gas outlet 205.

[0095] It can be seen that the wind supply device 1 of the mixing system provides the motive power for air suction, gas suction and air-gas mixing. The flow collecting device 2 generates suction kinetic energy for the gas under the action of air flow, so that the gas can smoothly enter the mixing device 3 to enhance the mixing effect of air and gas and uniformly flow to the combustion chamber 4, thereby realizing efficient combustion.

[0096] Embodiment 4

[0097] A water heater comprising the above-mentioned combustion system.

[0098] The above-mentioned water heater pre-mixes the mixed gas at the rear end of the fan, has high electrical safety, and improves the mixing uniformity of the mixed gas and the combustion effect of the water heater.

[0099] Obviously, the above embodiments are only examples for clearly illustrating the present application and are not intended to limit the present application. Based on the above description, other different forms of changes or modifications can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A mixing device for a combustion system of a water heater, characterized in that, The mixing device comprises: a shell (31) enclosing an inner mixing cavity (303), one end of the shell (31) being provided with a gas mixing inlet (304) adapted to introduce mixed gas into the inner mixing cavity (303); wherein a plurality of shunt holes (302) are arranged on the side wall of the shell (31), and the shunt holes (302) are adapted to guide the mixed gas in the inner mixing cavity (303) outwards; Further comprising: at least one guide vane (32) arranged in the inner mixing cavity (303), the guide vane (32) being in a conical structure, and the guide vane (32) being connected with the shell (31), the guide vane (32) being adapted to divide at least two guide cavities (301) in the inner mixing cavity (303) in a first direction (Y); wherein a gas flow passage (305) is arranged on the guide vane (32) to enable the adjacent two guide cavities (301) to communicate with each other; The mixing device constitutes a turbulent flow device, the guide vane (32) can form a layered turbulent flow device, under the action of the layered turbulent flow device, the mixed gas is dispersed and sprayed out from each shunt hole (302) after multiple turbulent flows, so that the two laminar gases become turbulent mixed gas, and the mixing effect of the mixed gas can be enhanced.

2. The mixed flow device of claim 1, wherein The mixing device comprises: at least two guide vanes (32), the at least two guide vanes (32) being arranged in the first direction (Y), and the projection area of one of the flow passages (305) is less than or equal to the projection area of the other flow passages (305) along the first direction (Y).

3. The mixed flow device of claim 2, wherein, The projection areas of the at least two flow passages (305) gradually decrease along the first direction (Y).

4. The mixed flow device of claim 1, wherein The shell (31) is in a cylindrical or conical cylindrical shape, one end of the cylindrical or conical cylindrical shape is open, and is adapted to form the gas mixing inlet (304).

5. The mixed flow device of any one of claims 1 to 4, wherein, The shell (31) is provided with a guide plate (33) arranged in a direction away from the shell (31) near or at the shunt hole (302).

6. The mixed flow device of any one of claims 1 to 4, wherein, A plurality of shunt holes (302) are arranged in a staggered manner along the first direction (Y).

7. The mixed flow device of claim 6, wherein The distance between adjacent two shunt holes (302) is the same in the circumferential direction of the side wall of the shell (31).

8. A gas mixing system characterized by, The mixing device (3) according to any one of claims 1 to 7 is arranged in the flow converging cavity (201); wherein the inner mixing cavity (303) of the mixing device (3) communicates with the flow converging cavity (201) through the shunt hole (302). Further comprising: a fixed sheet (21) arranged at the gas outlet end (204), a plurality of gas outlets (205) communicating with the flow converging cavity (201) are arranged on the fixed sheet (21); 9. The gas mixing system of claim 8, wherein, wherein the shell (31) of the mixing device (3) is connected with the fixed sheet (21). The mixing device comprises: ​ 10. A combustion system characterized by, ​ Gas valve, having a gas inlet and a gas outlet, the gas inlet being connected to a gas line ； The gas mixing system of claim 8 or 9, the second gas inlet end (203) of the gas mixing system being connected to the gas outlet; Air supply device (1) connected to the first gas inlet end (202) of the gas mixing system; Combustion chamber (4) connected to the gas outlet end (204) of the gas mixing system.

11. A water heater, characterized by Comprising: The combustion system of claim 10.

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