A burner tip, a burner and a method of controlling a burner

Abstract

The present application relates to the technical field of kitchen utensils, and particularly relates to a burner, a combustor and a control method of the combustor. The combustor comprises a burner and a fan assembly, the burner comprises a burner main body and a distributor, the burner main body is internally provided with an outer ring mixing channel, an inner ring mixing channel and an air buffer channel, the outer ring mixing channel and the inner ring mixing channel are both used for primary mixing of gas and air, the air buffer channel is communicated with the fan assembly, the distributor is arranged on the burner main body and is provided with an outer ring mixing cavity and an inner ring mixing cavity, the outer ring mixing channel and the air buffer channel are both communicated with the outer ring mixing cavity, and the inner ring mixing channel and the air buffer channel are both communicated with the inner ring mixing cavity. The combustor can realize three times of mixing of gas and air, the combustion efficiency of the gas is high, and the generated waste gas is less, in addition, the supplementary secondary air will not directly impact the fire hole, so that the stability of flame combustion is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kitchen appliances, in particular to a burner, a combustor and a control method of the combustor. BACKGROUND

[0002] Gas stove is a very common kitchen appliance, and its core component is combustor. The existing combustor generally comprises a burner and a nozzle. The burner forms an inner ring mixing chamber and an outer ring mixing chamber, and the inner ring mixing chamber and the outer ring mixing chamber respectively have an inlet and an outlet (i.e. a fire hole for generating a flame). The nozzles are respectively arranged at the inlets of the outer ring mixing chamber and the inner ring mixing chamber. In actual use, the gas is sprayed into the corresponding inlet by the nozzle, and then the primary air is induced into the outer ring mixing chamber and the inner ring mixing chamber by natural induction. The primary air and the gas are mixed in the corresponding mixing chamber, and then discharged from the corresponding fire hole for combustion. This combustor has the shortcomings of insufficient primary air induction, low combustion efficiency of the gas, and more exhaust gas emission of the combustor.

[0003] To this end, the existing technology provides a combustor, which further comprises a fan, and an air buffer channel is arranged in the burner. The air inlet of the air buffer channel is communicated with the fan, and the air outlet of the air buffer channel is arranged at the side of the fire hole. When the combustor is working, the fan blows air into the air buffer channel, and the air is discharged from the air outlet and reaches the surroundings of the inner ring fire hole and the outer ring fire hole, i.e. the combustion area of the fire hole is supplemented with secondary air, so as to improve the combustion efficiency and reduce the exhaust gas emission of the combustor. However, this combustor has the following problems. On the one hand, the flow of the secondary air will interfere with the flow of the mixed gas discharged from the fire hole, resulting in unstable flame combustion. On the other hand, the secondary air cannot be fully mixed with the mixed gas discharged from the fire hole, so the effect of improving the low combustion efficiency and the more exhaust gas emission of the combustor is poor.

[0004] Therefore, there is an urgent need for a burner, a combustor and a control method of the combustor to solve the above technical problems. SUMMARY

[0005] One object of the present application is to provide a burner, which can realize three times mixing of gas and air, improve the combustion efficiency of the gas, reduce the exhaust gas generated by combustion, and further ensure the stability of flame combustion because the secondary air supplemented by the fan assembly does not directly impact the fire hole.

[0006] A second object of the present application is to provide a combustor, which has high combustion efficiency of the gas, generates less exhaust gas, and has stable combustion flame by arranging the above-mentioned burner.

[0007] A third object of the present application is to provide a control method of a combustor, which is applied to the above-mentioned combustor, has high combustion efficiency of the gas, generates less exhaust gas, and has stable combustion flame.

[0008] To achieve the above object, the present application adopts the following technical solutions:

[0009] A burner tip comprises:

[0010] A burner tip body, in which an outer ring mixing passage, an inner ring mixing passage and an air buffer passage are formed, the outer ring mixing passage and the inner ring mixing passage are configured for primary mixing of gas and air, and the inlet of the air buffer passage is configured to communicate with a fan assembly;

[0011] A burner cap is arranged on the burner tip body, and the burner cap is provided with an outer ring mixing chamber and an inner ring mixing chamber, the outer ring mixing passage and the air buffer passage both communicate with the outer ring mixing chamber, the outer ring mixing chamber communicates with the outside of the burner cap through an outer ring fire hole, and the inner ring mixing passage and the air buffer passage both communicate with the inner ring mixing chamber, and the inner ring mixing chamber communicates with the outside of the burner cap through an inner ring fire hole.

[0012] As an optional solution, the air buffer passage comprises an outer ring air outlet and an inner ring air outlet, the outer ring air outlet communicates with the outer ring mixing chamber, and the inner ring air outlet communicates with the inner ring mixing chamber, and the cross-sectional area of the outer ring air outlet is greater than that of the inner ring air outlet.

[0013] As an optional solution, the ratio of the cross-sectional area of the outer ring air outlet to that of the inner ring air outlet is 1.1-8:1.

[0014] As an optional solution, the outer ring mixing passage is provided with an outer ring outlet, the outer ring mixing chamber is provided with an outer ring inlet, and the outer ring outlet and the outer ring air outlet both communicate with the outer ring inlet; and / or

[0015] The air buffer passage is provided with an inner ring outlet, the inner ring mixing chamber is provided with an inner ring inlet, and the inner ring outlet and the inner ring air outlet both communicate with the inner ring inlet.

[0016] As an optional solution, the outer ring outlet is provided with at least two, the at least two outer ring outlets are distributed along the circumference of the burner tip body, the number and position of the outer ring air outlet correspond to those of the outer ring outlet respectively, and each outer ring outlet and the corresponding outer ring air outlet communicate with the outer ring mixing chamber through an outer ring inlet;

[0017] The inner ring air outlet is provided with at least two inner ring air outlets which are arranged at intervals along the circumference of the burner head body, the number and position of the inner ring air outlets correspond to the number and position of the inner ring air outlets respectively, and each inner ring air outlet and the corresponding inner ring air outlet are communicated with the inner ring mixing cavity through an inner ring air inlet.

[0018] As an optional solution, the air buffer channel comprises an outer ring air branch and an inner ring air branch, the inlet of the outer ring air branch is configured to communicate with the outer ring fan, and the outlet of the outer ring air branch is communicated with the outer ring mixing cavity.

[0019] The inlet of the inner ring air branch is configured to communicate with the inner ring fan, and the outlet of the inner ring air branch is communicated with the inner ring mixing cavity.

[0020] As an optional solution, the outer ring mixing channel comprises an outer ring ejection pipe and an outer ring primary mixing cavity which are communicated, the inlet of the outer ring ejection pipe is configured to communicate with the outer ring nozzle and external air respectively, the outer ring primary mixing cavity is communicated with the outer ring mixing cavity, and the cross-sectional area of the outer ring primary mixing cavity gradually decreases along the direction of airflow flow.

[0021] The inner ring mixing channel comprises an inner ring ejection pipe and an inner ring primary mixing cavity which are communicated, the inlet of the inner ring ejection pipe is configured to communicate with the inner ring nozzle and external air respectively, the inner ring primary mixing cavity is communicated with the inner ring mixing cavity, and the cross-sectional area of the inner ring primary mixing cavity gradually decreases along the direction of airflow flow.

[0022] The air buffer channel comprises an air inlet pipe and an air buffer cavity which are communicated, the inlet of the air inlet pipe is configured to communicate with the fan assembly, the air buffer cavity is communicated with the outer ring mixing cavity and the inner ring mixing cavity respectively, and the cross-sectional area of the air buffer cavity gradually decreases along the direction of airflow flow.

[0023] As an optional solution, the burner head further comprises a check valve which is installed at the inlet of the air buffer channel, and the check valve is configured to allow airflow to flow into the air buffer channel in one direction only.

[0024] A burner, comprising a fan assembly, an inner ring nozzle, an outer ring nozzle and the burner head, the fan assembly is used to blow air into the air buffer channel, the inner ring nozzle is used to inject fuel gas into the inner ring mixing channel, and the outer ring nozzle is used to inject fuel gas into the outer ring mixing channel.

[0025] A control method of a burner, applied to the burner, the control method of the burner comprises:

[0026] Step 10, obtaining the gas flow information entering the outer ring mixing channel and the inner ring mixing channel;

[0027] Step 20, judging whether the condition of opening the fan assembly is met according to the gas flow information in step 10;

[0028] Step 30, if yes, opening the fan assembly and outputting the corresponding blowing speed according to the amount of gas sprayed by the outer ring nozzle and the inner ring nozzle, if no, keeping the fan assembly closed;

[0029] Step 40, obtaining the gas flow information entering the outer ring mixing channel and the inner ring mixing channel;

[0030] Step 50, judging whether the condition of closing the fan assembly is met according to the gas flow information obtained in step 40;

[0031] Step 60, if yes, closing the fan assembly, if no, returning to step 40.

[0032] As an optional solution, in step 20, the condition of opening the fan assembly is that the time when the gas flow changes from zero to greater than zero is greater than a first preset time, and the first preset time is 5-30s.

[0033] As an optional solution, in step 50, the condition of closing the fan assembly is that the time when the gas flow changes from greater than zero to zero is greater than a second preset time, and the second preset time is 5-30s.

[0034] As an optional solution, in step 60, if yes, the fan assembly is closed after a third preset time, and the third preset time is 1-10s.

[0035] The present application has the following advantages:

[0036] The burner head of the present application sprays gas to the outer ring mixing channel and the inner ring mixing channel through the outer ring nozzle and the inner ring nozzle respectively, and sprays primary air into the corresponding mixing channel through the natural injection mode. The primary air and the gas are first mixed in the corresponding mixing channel, and then enter the outer ring mixing cavity and the inner ring mixing cavity respectively. The fan assembly blows secondary air into the air buffer channel, and the secondary air also enters the outer ring mixing cavity and the inner ring mixing cavity respectively. At this time, the secondary air and the primary mixed gas are secondarily mixed in the outer ring mixing cavity and the inner ring mixing cavity respectively. Then the gas after secondary mixing is discharged from the outer ring fire hole and the inner ring fire hole for combustion. At this time, the air outside the burner head body can also be thirdly mixed with the secondary mixed gas for combustion. The burner head of the present application can realize three times of mixing of gas and air, thereby improving the uniformity and sufficiency of the mixing of gas and air, and greatly improving the combustion efficiency of gas and reducing the waste gas generated by combustion. In addition, the secondary air supplemented by the fan assembly can be fully mixed with the gas in the outer ring mixing cavity and the inner mixing cavity, avoiding the direct impact of the secondary air on the fire hole, thereby ensuring the stability of the flame combustion.

[0037] The burner of the present application has high gas combustion efficiency, generates less waste gas, and has stable combustion flame by setting the above-mentioned burner head.

[0038] The control method of the burner of the present application has high gas combustion efficiency, generates less waste gas, and has stable combustion flame by using the above-mentioned burner. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structural schematic diagram of the burner provided by the embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the first burner head body and the flame divider in a separated state provided by the embodiment of the present application;

[0041] Figure 3 is a schematic diagram of the first burner head body in a bottom view provided by the embodiment of the present application;

[0042] Figure 4 is a schematic diagram of the flame divider in a bottom view provided by the embodiment of the present application;

[0043] Figure 5 is a cross-sectional schematic diagram of the first burner head body provided by the embodiment of the present application;

[0044] Figure 6 is Figure 5 A-A sectional view in the above-mentioned

[0045] Figure 7is a second cross-sectional view of a furnace end body provided by the embodiment of the present application;

[0046] Figure 8 is Figure 7 is a B-B cross-sectional view of the furnace end body in

[0047] Figure 9 is a top view of a burner provided by the embodiment of the present application;

[0048] Figure 10 is a flow chart of a control method of the burner provided by the embodiment of the present application.

[0049] in the drawings:

[0050] 10, furnace end;

[0051] 11, furnace end body; 111, outer ring mixing passage; 1111, outer ring ejection pipe; 1112, outer ring primary mixing cavity; 1113, outer ring gas outlet; 112, inner ring mixing passage; 1121, inner ring ejection pipe; 1122, inner ring primary mixing cavity; 1123, inner ring gas outlet; 113, air buffer passage; 1131, air inlet pipe; 1132, air buffer cavity; 1133, outer ring air outlet; 1134, inner ring air outlet; 1135, outer ring air branch; 1136, inner ring air branch;

[0052] 12, burner; 121, outer ring mixing cavity; 122, inner ring mixing cavity; 123, outer ring gas hole; 124, inner ring gas hole; 125, outer ring gas inlet; 126, inner ring gas inlet;

[0053] 13, check valve;

[0054] 20, fan assembly; 21, outer ring fan; 22, inner ring fan;

[0055] 31, outer ring damper assembly; 32, inner ring damper assembly;

[0056] 40, gas flow sensor;

[0057] 50, controller. DETAILED DESCRIPTION

[0058] The present application will be further described below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not in limitation of the present application. It should also be noted that, for the sake of brevity, only portions of the structures related to the present application are shown in the drawings.

[0059] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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 internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise explicitly specified and limited, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0061] In the description of the present embodiment, the terms "up", "down", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0062] The present embodiment provides a burner head and a gas appliance, such as Figure 1 As shown, the burner includes a burner head 10, a fan assembly 20, an outer ring damper assembly 31, an inner ring damper assembly 32, an outer ring nozzle and an inner ring nozzle (not shown).

[0063] As shown in Figure 1 and Figure 2 The burner head 10 includes a burner head body 11 and a burner 12, wherein the burner 12 can be covered on the upper side of the burner head body 11. Specifically, as shown in Figure 2 and Figure 3As shown, the inside of the furnace head body 11 is provided with an outer ring mixing passage 111, an inner ring mixing passage 112 and an air buffer passage 113, the outer ring mixing passage 111 and the inner ring mixing passage 112 are configured to mix the gas and air once. Specifically, the outer ring nozzle can spray the gas into the outer ring mixing passage 111, and introduce the primary air into the outer ring mixing passage 111 by natural induction. The inner ring nozzle can spray the gas into the inner ring mixing passage 112, and introduce the primary air into the inner ring mixing passage 112 by natural induction. The fan assembly 20 is installed at the entrance of the air buffer passage 113, and can blow the air into the air buffer passage 113. The air can be circulated and stabilized in the air buffer passage 113. As shown in Figure 2 and Figure 4 As shown, the outer ring mixing cavity 121 and the inner ring mixing cavity 122 are provided on the inner ring nozzle 12, the outer ring mixing passage 111 and the air buffer passage 113 are communicated with the outer ring mixing cavity 121, and the outer ring mixing cavity 121 is communicated to the outside of the inner ring nozzle 12 through the outer ring fire hole 123. The inner ring mixing passage 112 and the air buffer passage 113 are communicated with the inner ring mixing cavity 122, and the inner ring mixing cavity 122 is communicated to the outside of the inner ring nozzle 12 through the inner ring fire hole 124.

[0064] When the burner of the present embodiment is used, the outer ring nozzle and the inner ring nozzle spray the gas into the outer ring mixing passage 111 and the inner ring mixing passage 112 respectively, and introduce the primary air into the corresponding mixing passage by natural induction. The primary air and the gas are mixed once in the corresponding mixing passage, and then enter the outer ring mixing cavity 121 and the inner ring mixing cavity 122 respectively. The fan assembly 20 blows the secondary air into the air buffer passage 113, and the secondary air enters the outer ring mixing cavity 121 and the inner ring mixing cavity 122 respectively, at which time the secondary air and the primary mixed gas are mixed twice in the outer ring mixing cavity 121 and the inner ring mixing cavity 122 respectively. Then the gas after twice mixing is discharged from the outer ring fire hole 123 and the inner ring fire hole 124 respectively for combustion, at which time the air outside the furnace head body 11 can also be mixed with the gas after twice mixing for three times of combustion. The burner of the present embodiment can not only realize three times of mixing of the gas and air, so as to improve the uniformity and sufficiency of the mixing of the gas and air, and further greatly improve the combustion efficiency of the gas and reduce the waste gas generated by combustion; in addition, the secondary air supplemented by the fan assembly 20 can be fully mixed and stabilized with the gas in the outer ring mixing cavity 121 and the inner ring mixing cavity 122, so as to avoid the secondary air directly impacting the fire hole, thereby ensuring the stability of the flame combustion.

[0065] As shown in Figure 1 , Figure 3 and Figure 4As shown, an outer ring damper assembly 31 is installed at the inlet of the outer ring mixing passage 111, and the outer ring nozzle is communicated with the outer ring mixing passage 111 through the outer ring damper assembly 31. As shown in Figure 1 As shown, a sector-shaped gap is arranged at the inlet of the outer ring mixing passage 111, and the outer ring damper assembly 31 comprises a damper blade and a mounting pipe, and the outer ring nozzle is connected with the mounting pipe so as to be capable of injecting fuel gas into the outer ring mixing passage 111. The sector-shaped gap can be opened by rotating the damper blade, and when the outer ring nozzle injects fuel gas into the outer ring mixing passage 111, the flow velocity of the airflow inside the outer ring mixing passage 111 is greater than that of the external air, so that a negative pressure environment is formed, and thus the external air can enter into the outer ring mixing passage 111 through the sector-shaped gap, that is, the natural injection of primary air is realized. An inner ring damper assembly 32 is installed at the inlet of the inner ring mixing passage 112, and the inner ring nozzle is communicated with the inner ring mixing passage 112 through the inner ring damper assembly 32. The structure and working principle of the inner ring nozzle and the inner ring damper assembly 32 are the same as those of the outer ring nozzle and the outer ring damper assembly 31, and thus will not be described herein.

[0066] As shown in Figure 3 and Figure 5 The outer ring mixing passage 111 comprises an outer ring injection pipe 1111 and an outer ring primary mixing cavity 1112 which are communicated with each other, the inlet of the outer ring injection pipe 1111 is the inlet of the outer ring mixing passage 111, and the outer ring injection pipe 1111 is connected with the outer ring damper assembly 31, and thus is capable of being communicated with the outer ring nozzle and the external air respectively. The outer ring primary mixing cavity 1112 is substantially annular, and as shown in Figure 6 The outer ring primary mixing cavity 1112 is communicated with the outer ring mixing cavity 121 of the igniter 12, so that the fuel gas which has been mixed once enters into the outer ring mixing cavity 121 to be mixed with the secondary air. Preferably, the cross-sectional area of the outer ring primary mixing cavity 1112 gradually decreases along the flow direction of the airflow. Because the velocity of the airflow gradually decreases as the airflow flows in the outer ring mixing passage 111, the cross-sectional area of the outer ring primary mixing cavity 1112 is arranged to gradually decrease, so that the flow velocity of the airflow matches the cross-sectional area, and thus the mixed gas swirls in the outer ring primary mixing cavity 1112, so that the fuel gas and the primary air are fully mixed, and the mixed gas is uniformly distributed in the outer ring mixing passage 111. In the embodiment, as shown in Figure 2 , Figure 4 and Figure 6 The outer ring mixing passage 111 comprises an outer ring gas outlet 1113, and the outer ring mixing cavity 121 has an outer ring gas inlet 125, and when the igniter 12 is covered on the furnace head main body 11, the outer ring gas outlet 1113 is located below the outer ring gas inlet 125 and is arranged opposite to the outer ring gas inlet 125.

[0067] As shown in Figure 3 and Figure 5As shown, the inner ring mixing channel 112 includes an inner ring ejector tube 1121 and an inner ring primary mixing chamber 1122 connected to each other. The inlet of the inner ring ejector tube 1121 is also the inlet of the inner ring mixing channel 112, and it is connected to the inner ring damper assembly 32, thus enabling communication with the inner ring nozzle and external air respectively. The inner ring primary mixing chamber 1122 is generally annular, as shown in the figure. Figure 6 As shown, the inner annular primary mixing chamber 1122 is connected to the inner annular mixing chamber 122 of the distributor 12, allowing the gas mixture after primary mixing to enter the inner annular mixing chamber 122 for secondary mixing with the secondary air. Preferably, the cross-sectional area of ​​the inner annular primary mixing chamber 1122 gradually decreases along the airflow direction. Because the airflow velocity gradually decreases as the airflow moves within the inner annular mixing channel 112, setting the cross-sectional area of ​​the inner annular primary mixing chamber 1122 to gradually decrease allows the airflow velocity to match the cross-sectional area, thereby causing the mixed gas to swirl and flow within the inner annular primary mixing chamber 1122, ensuring thorough mixing of the gas mixture with the primary air and uniform distribution of the primary mixed gas within the inner annular mixing channel 112. In this embodiment, as... Figure 2 , Figure 4 and Figure 6 As shown, the inner ring mixing channel 112 includes an inner ring air outlet 1123, and the inner ring mixing chamber 122 has an inner ring air inlet 126. When the burner 12 is placed on the burner body 11, the inner ring air outlet 1123 is located below the inner ring air inlet 126 and is arranged opposite to the inner ring air inlet 126.

[0068] like Figure 3 and Figure 5 As shown, the air buffer channel 113 includes an air inlet pipe 1131 and an air buffer chamber 1132 that are connected to each other. The inlet of the air inlet pipe 1131 is also the inlet of the air buffer channel 113, and it is connected to the fan assembly 20, so that the fan assembly 20 can blow air into the air buffer channel 113. Figure 6 As shown, the air buffer chamber 1132 is connected to both the outer ring mixing chamber 121 and the inner ring mixing chamber 122, allowing secondary air to enter both chambers and mix with the primary-mixed fuel gas. Preferably, the cross-sectional area of ​​the air buffer chamber 1132 gradually decreases along the airflow direction. This is because the gas velocity gradually decreases as the air flows within the air buffer channel 113. By setting the cross-sectional area of ​​the air buffer chamber 1132 to gradually decrease, the airflow velocity is matched to the cross-sectional area, ensuring that the air swirls within the air buffer chamber 1132, thus stabilizing the airflow and ensuring uniform air distribution within the air buffer channel 113. In this embodiment, as... Figure 2 , Figure 4 and Figure 6As shown, the air buffer passage 113 includes an inner ring air outlet 1134 and an outer ring air outlet 1133, when the burner cap 12 is arranged on the burner body 11, the outer ring air outlet 1133 is located below the outer ring air inlet 125 and is arranged opposite to the outer ring air inlet 125, and the inner ring air outlet 1134 is located below the inner ring air inlet 126 and is arranged opposite to the inner ring air inlet 126.

[0069] As shown in Figure 1 , the burner 10 further includes a check valve 13, which is installed at the entrance of the air buffer passage 113, and is configured to allow air flow to flow into the air buffer passage 113 in one direction only. Therefore, when the fan assembly 20 is damaged, the check valve 13 can prevent the gas from flowing out of the air buffer passage 113 to the outside of the burner body 11 in the reverse direction, thereby improving the safety of the burner. It can be understood that the check valve 13 can be any one of the prior art without departing from the concept of the present application, which is not limited here.

[0070] As shown in Figure 2 and Figure 4 , the outer ring air outlet 1113 is provided with at least two, which are distributed along the circumference of the burner body 11, the number and position of the outer ring air outlet 1133 correspond to the number and position of the outer ring air outlet 1113 respectively, and the number and position of the outer ring air inlet 125 correspond to the number and position of the outer ring air outlet 1113 respectively, so that each outer ring air outlet 1113 and the corresponding outer ring air outlet 1133 are communicated with the outer ring mixing chamber 121 through an outer ring air inlet 125. Therefore, the primary mixed gas in the outer ring mixing passage 111 and the air in the air buffer passage 113 can be uniformly mixed in the circumferential direction into the outer ring mixing chamber 121 for secondary mixing, thereby improving the uniformity of the secondary mixing. In the present embodiment, the outer ring air outlet 1113, the outer ring air outlet 1133 and the outer ring air inlet 125 are all provided in the form of a circular arc. Alternatively, the number of the outer ring air outlet 1113, the outer ring air outlet 1133 and the outer ring air inlet 125 is four, which are uniformly distributed along the circumference of the burner body 11, and in other embodiments, the number of the outer ring air outlet 1113, the outer ring air outlet 1133 and the outer ring air inlet 125 can be three, five or more, which are not limited here.

[0071] Similarly, as shown in Figure 2 and Figure 4As shown, the inner ring air outlet 1123 is provided with at least two, and the at least two inner ring air outlets 1123 are arranged at intervals along the circumference of the furnace end body 11. The number and position of the inner ring air outlet 1123 correspond to the number and position of the inner ring air outlet 1134, and the number and position of the inner ring air inlet 126 correspond to the number and position of the inner ring air outlet 1123. Each inner ring air outlet 1123 and the corresponding inner ring air outlet 1134 are communicated with the inner ring mixing chamber 122 through an inner ring air inlet 126. Thus, the primary mixed gas in the inner ring mixing passage 112 and the air in the air buffer passage 113 can enter the inner ring mixing chamber 122 uniformly along the circumference for secondary mixing, thereby improving the uniformity of the secondary mixing. In the embodiment, the inner ring air outlet 1123, the inner ring air outlet 1134 and the inner ring air inlet 126 are provided in the shape of a circular arc. Alternatively, the number of the inner ring air outlet 1123, the inner ring air outlet 1134 and the inner ring air inlet 126 is two, and they are uniformly distributed along the circumference of the furnace end body 11. In other embodiments, the number of the inner ring air outlet 1123, the inner ring air outlet 1134 and the inner ring air inlet 126 can be three, four or more, which is not limited herein.

[0072] In one embodiment, as shown in Figure 2 , Figure 5 and Figure 6 , the air buffer passage 113 is an integral chamber, and the cross-sectional area of the outer ring air outlet 1133 is greater than that of the inner ring air outlet 1134. Generally, the volume and load of the outer ring mixing chamber 121 are greater than those of the inner ring mixing chamber 122. Therefore, by setting the cross-sectional area of the outer ring air outlet 1133 to be greater than that of the inner ring air outlet 1134, the total amount of secondary air entering the outer ring mixing chamber 121 can be greater than that entering the inner ring mixing chamber 122, i.e., the distribution of secondary air is optimized, the amount of secondary air is matched with the amount of gas in the corresponding mixing chamber, and the combustion efficiency is improved. Preferably, the ratio of the cross-sectional area of the outer ring air outlet 1133 to the cross-sectional area of the inner ring air outlet 1134 is 1.1-8:1, which can ensure that appropriate amounts of secondary air can enter the outer ring mixing chamber 121 and the inner ring mixing chamber 122, thereby improving the combustion efficiency. Alternatively, the ratio of the cross-sectional area of the outer ring air outlet 1133 to the cross-sectional area of the inner ring air outlet 1134 can be 1.1:1, 3.5:1, 6:1, 8:1, etc.

[0073] It should be noted that, for the scheme with multiple outer ring air outlets 1133 and multiple inner ring air outlets 1134, the ratio of the cross-sectional area of the outer ring air outlet 1133 to the inner ring air outlet 1134 represents the ratio of the total cross-sectional area of the multiple outer ring air outlets 1133 to the total cross-sectional area of the multiple inner ring air outlets 1134.

[0074] In one embodiment, as shown in Figure 7 and Figure 8 , the air buffer channel 113 includes an outer ring air branch 1135 and an inner ring air branch 1136, and the fan assembly 20 includes an outer ring fan 21 and an inner ring fan 22. The outer ring fan 21 is in communication with the inlet of the outer ring air branch 1135 and can blow air into the outer ring air branch 1135, and the outlet of the outer ring air branch 1135 is in communication with the outer ring mixing chamber 121. The inner ring fan 22 is in communication with the inlet of the inner ring air branch 1136 and can blow air into the inner ring air branch 1136, and the outlet of the inner ring air branch 1136 is in communication with the inner ring mixing chamber 122. That is, in this embodiment, by cooperating the outer ring air branch 1135 and the outer ring fan 21, and the inner ring air branch 1136 and the inner ring fan 22, the total amount of secondary air respectively supplemented into the outer ring mixing chamber 121 and the inner ring mixing chamber 122 can be more accurately controlled, and the amount of secondary air supplemented into the outer ring mixing chamber 121 and the inner ring mixing chamber 122 respectively does not interfere with each other, so that the combustion condition of the burner is better.

[0075] Preferably, as shown in Figure 9 , the burner further comprises a controller 50 and a gas flow sensor 40, the controller 50 is configured as a device including software and hardware, and the gas flow sensor 40 and the fan assembly 20 are electrically connected to the controller 50. The gas flow sensor 40 can detect the flow information of the combustion of the outer ring nozzle and the inner ring nozzle respectively injected into the outer ring mixing channel 111 and the inner ring mixing channel 112. The controller 50 can control whether the fan assembly 20 starts to work and the blowing speed output by the fan assembly 20 according to the detection result of the gas flow sensor 40. It should be noted that, in this embodiment, the outer ring nozzle and the inner ring nozzle are configured to be associatedly connected, that is, they are opened and closed at the same time.

[0076] As shown in Figure 10 , the present embodiment further provides a control method of a burner. Specifically, the control method of the burner is applied to the above-mentioned burner. The control method of the burner comprises:

[0077] Step 10, obtaining the gas flow information entering the outer ring mixing channel 111 and the inner ring mixing channel 112;

[0078] Step 20, judging whether the condition for starting the fan assembly 20 is met according to the gas flow information in step 10;

[0079] Step 30, if yes, then the blower assembly 20 is started, and the corresponding air blowing speed is output according to the amount of gas sprayed by the outer ring nozzle and the inner ring nozzle, and if no, then the blower assembly 20 is kept closed;

[0080] Step 40, the gas flow information entering the outer ring mixing channel 111 and the inner ring mixing channel 112 is obtained;

[0081] Step 50, whether the condition for closing the blower assembly 20 is met according to the gas flow information obtained in step 40 is determined;

[0082] Step 60, if yes, then the blower assembly 20 is closed, and if no, then the step 40 is returned to.

[0083] The control method of the burner of the embodiment can ensure that the gas and air are fully and uniformly mixed, and thus the combustion efficiency of the burner is high, the generated waste gas is less, and the combustion flame is stable. When the gas flow information in the outer ring mixing channel 111 and the inner ring mixing channel 112 reaches the condition for closing the blower assembly 20, it is determined that the burner stops or is about to stop working, and at this time, the air blown into the blower assembly 20 is stopped.

[0084] In steps 10 and 40 of the embodiment, the gas in the outer ring mixing channel 111 and the inner ring mixing channel 112 is respectively sprayed through the outer ring nozzle and the inner ring nozzle, and the corresponding gas flow information can be detected by the gas flow sensor 40. In other embodiments, other components can also be used to detect the gas flow in the outer ring mixing channel 111 and the inner ring mixing channel 112, which is not limited here.

[0085] Preferably, in step 20, the condition for starting the blower assembly 20 is that the time when the gas flow changes from zero to greater than zero is greater than a first preset time, and the first preset time is 5-30s. By starting to supply secondary air after the first preset time after starting to supply gas, the proportion of gas in the mixed gas reaching the outer ring fire hole 123 and the inner ring fire hole 124 within the first preset time is higher, and the gas flow is more stable, thereby facilitating ignition and making the outer ring fire hole 123 and the inner ring fire hole 124 quickly reach a stable combustion state, avoiding difficult ignition and flame extinguishing. The secondary air supplied by the blower assembly 20 after the first preset time can ensure sufficient subsequent combustion of the gas. Alternatively, the first preset time can be set to 5s, 10s, 15s, 20s, 25s, or 30s.

[0086] Preferably, in step 50, the condition for determining whether to close the fan assembly 20 is that the time for the gas flow to change from greater than zero to equal to zero is greater than a second preset time, and the second preset time is 5-30s. That is, within the second preset time after the gas supply is stopped, the fan assembly 20 still supplies secondary air. On the one hand, if the user temporarily closes the outer ring nozzle and the inner ring nozzle due to misoperation and then immediately opens them, the condition for closing the fan assembly 20 is not met, so there is no action of closing and then reopening, thereby ensuring the continuous supply of secondary air. On the other hand, if the user does close the outer ring nozzle and the inner ring nozzle, the secondary air can discharge and burn the gas in the outer ring mixing chamber 121 and the inner ring mixing chamber 122 within the second preset time for the fan to delay closing, thereby reducing the gas retention in the burner 10 and improving safety. Optionally, the second preset time can be set to 5s, 10s, 15s, 20s, 25s, or 30s.

[0087] Preferably, in step 60, if it is determined that the fan assembly 20 meets the condition for closing, the fan assembly 20 is closed after a third preset time, and the third preset time is 1-10s. This further increases the time for the fan assembly 20 to delay closing, thereby reducing the gas retention in the burner 10 and improving safety. Optionally, the third preset time can be set to 1s, 3s, 5s, 7s, or 10s.

[0088] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. Based on the idea of the present application, those skilled in the art can make changes in specific embodiments and application ranges, and the content of the specification should not be understood as limiting the present application. Any modification, equivalent replacement, and improvement within the spirit and principles of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A stove head, characterized in that, include: The burner body (11) has an outer ring mixing channel (111), an inner ring mixing channel (112) and an air buffer channel (113) inside. The outer ring mixing channel (111) and the inner ring mixing channel (112) are both configured for primary mixing of fuel gas and air. The inlet of the air buffer channel (113) is configured to communicate with the fan assembly (20) and to introduce secondary air. A flame distributor (12) is mounted on the burner body (11). The flame distributor (12) has an outer ring mixing chamber (121) and an inner ring mixing chamber (122). The outer ring mixing channel (111) and the air buffer channel (113) are both connected to the outer ring mixing chamber (121) so that the secondary air and the gas mixture after the primary mixing can be mixed again in the outer ring mixing chamber (121). The outer ring mixing chamber (121) is connected to the outside of the flame distributor (12) through the outer ring flame hole (123) so that the air outside the burner can be mixed with the gas mixture. The secondary-mixed gas discharged from the outer ring flame hole (123) is mixed tertiarily; the inner ring mixing channel (112) and the air buffer channel (113) are both connected to the inner ring mixing chamber (122) so that the secondary air and the primary-mixed gas are mixed tertiarily in the inner ring mixing chamber (122). The inner ring mixing chamber (122) is connected to the outside of the flame distributor (12) through the inner ring flame hole (124) so ​​that the air outside the burner head is mixed tertiarily with the secondary-mixed gas discharged from the inner ring flame hole (124).

2. The burner head as described in claim 1, characterized in that, The air buffer channel (113) includes an outer ring air outlet (1133) and an inner ring air outlet (1134). The outer ring air outlet (1133) is connected to the outer ring mixing chamber (121), and the inner ring air outlet (1134) is connected to the inner ring mixing chamber (122). The cross-sectional area of ​​the outer ring air outlet (1133) is larger than that of the inner ring air outlet (1134).

3. The burner head as described in claim 2, characterized in that, The ratio of the cross-sectional area of ​​the outer ring air outlet (1133) to the cross-sectional area of ​​the inner ring air outlet (1134) is 1.1 to 8:

1.

4. The burner head as described in claim 2, characterized in that, The outer ring mixing channel (111) has an outer ring air outlet (1113), the outer ring mixing chamber (121) has an outer ring air inlet (125), and both the outer ring air outlet (1113) and the outer ring air outlet (1133) are connected to the outer ring air inlet (125); and / or The inner ring mixing channel (112) has an inner ring air outlet (1123), the inner ring mixing chamber (122) has an inner ring air inlet (126), and the inner ring air outlet (1123) and the inner ring air outlet (1134) are both connected to the inner ring air inlet (126).

5. The burner head as described in claim 4, characterized in that, At least two outer ring air outlets (1113) are provided, and the at least two outer ring air outlets (1113) are distributed at intervals along the circumference of the burner body (11). The number and position of the outer ring air outlets (1133) correspond to the number and position of the outer ring air outlets (1113). Each outer ring air outlet (1113) and the corresponding outer ring air outlet (1133) are connected to the outer ring mixing chamber (121) through an outer ring air inlet (125). At least two inner ring air outlets (1123) are provided, and at least two inner ring air outlets (1123) are arranged at intervals along the circumference of the burner body (11). The number and position of the inner ring air outlets (1134) correspond to the number and position of the inner ring air outlets (1123). Each inner ring air outlet (1123) and the corresponding inner ring air outlet (1134) are connected to the inner ring mixing chamber (122) through an inner ring air inlet (126).

6. The burner head as described in claim 1, characterized in that, The air buffer channel (113) includes an outer ring air branch (1135) and an inner ring air branch (1136). The inlet of the outer ring air branch (1135) is configured to communicate with the outer ring fan (21), and the outlet of the outer ring air branch (1135) is communicated with the outer ring mixing chamber (121). The inlet of the inner ring air duct (1136) is configured to communicate with the inner ring fan (22), and the outlet of the inner ring air duct (1136) is configured to communicate with the inner ring mixing chamber (122).

7. The burner head as described in any one of claims 1-6, characterized in that, The outer ring mixing channel (111) includes a connected outer ring ejector tube (1111) and an outer ring primary mixing chamber (1112). The inlet of the outer ring ejector tube (1111) is configured to communicate with the outer ring nozzle and external air, respectively. The outer ring primary mixing chamber (1112) is connected to the outer ring mixing chamber (121). Along the airflow direction, the cross-sectional area of ​​the outer ring primary mixing chamber (1112) gradually decreases; and / or The inner ring mixing channel (112) includes an inner ring ejector tube (1121) and an inner ring primary mixing chamber (1122) connected to each other. The inlet of the inner ring ejector tube (1121) is configured to communicate with the inner ring nozzle and the outside air, respectively. The inner ring primary mixing chamber (1122) is connected to the inner ring mixing chamber (1122). Along the airflow direction, the cross-sectional area of ​​the inner ring primary mixing chamber (1122) gradually decreases; and / or The air buffer channel (113) includes an air intake pipe (1131) and an air buffer chamber (1132) connected to each other. The inlet of the air intake pipe (1131) is configured to communicate with the fan assembly (20). The air buffer chamber (1132) is connected to the outer ring mixing chamber (121) and the inner ring mixing chamber (122) respectively. Along the airflow direction, the cross-sectional area of ​​the air buffer chamber (1132) gradually decreases.

8. The burner head as described in any one of claims 1-6, characterized in that, The burner head also includes a check valve (13), which is installed at the inlet of the air buffer channel (113) and is configured to allow only unidirectional airflow into the air buffer channel (113).

9. A burner, characterized in that, The device includes a blower assembly (20), an inner ring nozzle, an outer ring nozzle, and a burner head as described in any one of claims 1-8, wherein the blower assembly (20) is used to blow air into the air buffer channel (113), the inner ring nozzle is used to inject gas into the inner ring mixing channel (112), and the outer ring nozzle is used to inject gas into the outer ring mixing channel (111).

10. A method for controlling a burner, characterized in that, Applied to the burner of claim 9, the control method of the burner includes: Step 10: Obtain gas flow information entering the outer ring mixing channel (111) and the inner ring mixing channel (112); Step 20: Determine whether the conditions for starting the fan assembly (20) are met based on the gas flow information in step 10; Step 30: If yes, turn on the blower assembly (20) and output the corresponding blower speed according to the amount of gas injected by the outer ring nozzle and the inner ring nozzle; if no, keep the blower assembly (20) off. Step 40: Obtain gas flow information entering the outer ring mixing channel (111) and the inner ring mixing channel (112); Step 50: Determine whether the conditions for shutting down the fan assembly are met based on the gas flow information obtained in step 40. Step 60: If yes, shut down the fan assembly (20); otherwise, return to step 40.

11. The burner control method as described in claim 10, characterized in that, In step 20, the condition for determining whether the fan assembly is turned on is: the time for the gas flow rate to change from zero to greater than zero is greater than a first preset time, where the first preset time is 5~30s.

12. The burner control method as described in claim 10, characterized in that, In step 50, the condition for determining whether the fan assembly is shut down is: the time for the gas flow rate to change from greater than zero to equal to zero is greater than a second preset time, where the second preset time is 5~30s.

13. The burner control method as described in claim 10, characterized in that, In step 60, if so, the fan assembly (20) will shut down after a third preset time, which is 1-10 seconds.

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