Box-type gas heating device

Abstract

The present application relates to a kind of box type gas heating device, in heating process, by air inlet pipe to combustor to transport gas for combustion, so that high-temperature flue gas is formed in combustion chamber.Formed high-temperature flue gas and inner container contact heat exchange, to heat food, tableware or other articles in inner container, etc.Because the mixing element and the exhaust structure are provided with circulation pipe, part of the flue gas in the exhaust structure will be guided into the mixing element, and mixed with the gas in the air inlet pipe to replace air for primary premixing.Again, because the oxygen content in flue gas is much lower than that in air, such as: about only 1 / 3-1 / 2 of air, therefore, under the same constraint condition of limiting oxygen upper limit, the flue gas flow allowed to mix with gas is about 2-3 times of air, so that the gas concentration is greatly diluted, the combustion speed of mixed gas is significantly reduced, the combustion potential is effectively reduced, so that it is not combustible in delivery state, effectively reduces the risk of deflagration in combustion chamber.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas combustion technology, in particular to a box-type gas heating device. BACKGROUND

[0002] As a heating device, the box-type gas heating device is favored by users due to its high heating efficiency and fast heating speed, such as a gas oven, a gas steamer, etc. During the heating process of the traditional box-type gas heating device, when using gas with a high combustion speed, the gas combustion potential is large, and after the gas is mixed with primary air, the gas concentration of the mixed gas is already in the combustion range, and deflagration is prone to occur in the combustor or the combustion chamber, thereby affecting the use of the box-type gas heating device, and even causing safety accidents; at the same time, the use of such gas is also hindered. SUMMARY

[0003] One of the technical problems solved by the present application is to provide a box-type gas heating device which can effectively improve the combustion characteristics of the mixed gas, reduce the risk of deflagration, ensure stable and safe heating, and facilitate the use of gas with a high combustion speed.

[0004] The first technical problem is solved by the following technical solution:

[0005] A box-type gas heating device, comprising: a heating body, the heating body comprising a box body, an inner container, a combustion chamber, a smoke exhaust structure and a combustor, the combustion chamber being arranged in the box body, the inner container being arranged in the combustion chamber, and the combustion end of the combustor being arranged in the combustion chamber and being in thermal conduction connection with the inner container; a gas supply assembly, the gas supply assembly comprising an air inlet pipe, a circulation pipe and a mixing element, the first end of the mixing element being in communication with the combustor to supply mixed gas to the combustor; the air inlet pipe and the circulation pipe are both in communication with the second end of the mixing element (121), the air inlet pipe being used to supply gas to the mixing element, and the circulation pipe being further in communication with the smoke exhaust structure to supply part or all of the flue gas in the combustion chamber to the mixing element.

[0006] The box type gas heating device has the advantages that: in the heating process, the gas is delivered to the burner through the gas inlet pipe to be combusted, so that high-temperature flue gas is formed in the combustion chamber. The formed high-temperature flue gas exchanges heat with the inner container to heat the food, tableware or other articles in the inner container. Since the circulation pipe is arranged between the mixing element and the flue gas exhaust structure, part of the flue gas in the flue gas exhaust structure is guided into the mixing element and mixed with the gas in the gas inlet pipe to replace the air for primary premixing. Since the oxygen content in the flue gas is much lower than that in the air, for example, only about 1 / 3-1 / 2 of that in the air, under the same constraint condition of limiting the upper limit of oxygen content, the flue gas flow allowed to be mixed with the gas is about 2-3 times of that of the air, so that the gas concentration is greatly diluted, the combustion speed of the mixed gas is obviously reduced, the combustion potential is reduced by 35%-50%, the gas in the delivery state is not combustible, and the risk of deflagration in the combustion chamber is effectively reduced. At the same time, the mixed gas obtained by diluting the gas has similar characteristics to other low-combustion-potential gases, so that the high-combustion-speed gas is convenient to use and is conducive to the development of high-combustion-speed gas.

[0007] In one of the embodiments, the burner comprises a first burner and a second burner, and the mixing element comprises a first mixing element and a second mixing element, which are respectively communicated with the first burner and the second burner and are both communicated with the circulation pipe.

[0008] In one of the embodiments, the first burner and the second burner are respectively located at opposite sides of the inner container.

[0009] In one of the embodiments, the gas supply assembly further comprises a first control valve and a second control valve, the first control valve is used to control the flow amount of the flue gas in the circulation pipe into the first mixing element, and the second control valve is used to control the flow amount of the flue gas in the circulation pipe into the second mixing element.

[0010] In one of the embodiments, the gas inlet pipe comprises a main pipe and a first branch pipe and a second branch pipe communicated with the main pipe respectively, the first branch pipe is communicated with the first mixing element, and the second branch pipe is communicated with the second mixing element.

[0011] In one of the embodiments, the gas inlet pipe comprises a first gas valve and a second gas valve, the first gas valve is used to control the gas inlet amount of the gas in the first branch pipe into the first mixing element, and the second gas valve is used to control the gas inlet amount of the gas in the second branch pipe into the second mixing element.

[0012] In one embodiment, the exhaust structure includes an exhaust pipe and a manifold, one end of the exhaust pipe is connected to the combustion chamber and the other end is connected to the outside of the housing, and the circulation pipe is connected to the exhaust pipe through the manifold.

[0013] In one embodiment, the air supply assembly further includes a circulating fan, the air inlet of which is connected to the manifold, and the air outlet of which is connected to the circulating pipe.

[0014] In one embodiment, the exhaust pipe includes a first pipe section and a second pipe section. The first pipe section is connected to the combustion chamber, and the second pipe section is connected to the manifold via the first pipe section. The end of the second pipe section away from the first pipe section is connected to the outside of the housing.

[0015] In one embodiment, the mixing element has a mixing chamber and a supply air passage connected to the mixing chamber, the circulation pipe is connected to the mixing chamber, the intake pipe is connected to the supply air passage, and the supply air passage is connected to the burner.

[0016] In one embodiment, the housing is provided with an air inlet that communicates with the combustion chamber to provide secondary air for combustion in the burner. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the box-type gas heating device described in one embodiment;

[0020] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle circle;

[0021] Figure 3 This is a schematic diagram of a box-type gas heating device with a first control valve and a second control valve, as described in one embodiment.

[0022] Figure label:

[0023] 100, box type gas heating device; 110, heating body; 111, combustion chamber; 112, box body; 113, smoke exhaust structure; 1131, smoke exhaust pipe; 1132, first pipe section; 1133, second pipe section; 1134, manifold; 114, inner container; 115, burner; 1151, first burner; 1152, second burner; 120, gas supply assembly; 121, mixing element; 1211, mixing cavity; 1212, gas supply channel; 1213, first mixing element; 1214, second mixing element; 1215, first control valve; 1216, second control valve; 1217, first connecting pipe; 1218, second connecting pipe; 1219, injection area; 122, gas inlet pipe; 1221, nozzle; 1222, main pipe; 1223, first branch pipe; 1224, second branch pipe; 1225, first gas valve; 1226, second gas valve; 123, circulation pipe; 124, circulation fan. DETAILED DESCRIPTION

[0024] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0025] In one embodiment, please refer to Figure 1 A box type gas heating device 100, the box type gas heating device 100 comprising: a heating body 110 and a gas supply assembly 120. The heating body 110 comprises a box body 112, an inner container 114, a combustion chamber 111, a smoke exhaust structure 113 and a burner 115. The combustion chamber 111 is arranged in the box body 112. The inner container 114 is located in the combustion chamber 111. The combustion end of the burner 115 is located in the combustion chamber 111 and is in thermal conduction connection with the inner container 114. The gas supply assembly 120 comprises a gas inlet pipe 122, a circulation pipe 123 and a mixing element 121. The first end of the mixing element 121 is in communication with the burner 115 to supply mixed gas to the burner 115. The gas inlet pipe 122 and the circulation pipe 123 are both in communication with the second end of the mixing element 121, and the gas inlet pipe 122 is used to supply gas to the mixing element 121. The circulation pipe 123 is also in communication with the smoke exhaust structure 113 to supply part or all of the flue gas in the combustion chamber 111 to the mixing element 121.

[0026] The box-type gas heating device 100 described above, in the heating process, the gas is transported to the burner 115 through the gas inlet pipe 122 for combustion, so that the high-temperature flue gas is formed in the combustion chamber 111. The high-temperature flue gas formed is in contact with the inner container 114 for heat exchange, so as to heat the food, tableware or other articles in the inner container 114. Since the circulation pipe 123 is arranged between the mixing element 121 and the flue gas discharge structure 113, part of the flue gas in the flue gas discharge structure 113 is guided into the mixing element 121 and mixed with the gas in the mixing element 121 to replace the air for primary premixing. Since the oxygen content in the flue gas is much lower than that in the air, for example, only about 1 / 3-1 / 2 of that in the air, under the same constraint condition of limiting the upper limit of oxygen content, the flue gas flow allowed to be mixed with the gas is about 2-3 times of that of the air, so that the gas concentration is greatly diluted, the combustion speed of the mixed gas is obviously reduced, the combustion potential is reduced by 35%-50%, and the flue gas in the delivery state is non-combustible, thereby effectively reducing the risk of deflagration in the combustion chamber 111. At the same time, the mixed gas obtained by diluting the gas is similar to other low-combustion-potential gas, so that the high-combustion-speed gas is easy to use and is conducive to the development of high-combustion-speed gas. In addition, the flue gas circulation mode can effectively reduce the flame temperature in the combustion process, which is conducive to the suppression of the generation of nitrogen oxides and the improvement of the control of pollutants in the flue gas, so that the environmental protection index of the box-type gas heating device 100 is improved accordingly.

[0027] It should be noted that when the box-type gas heating device 100 adopts atmospheric combustion, the mixed gas of the gas and the flue gas in the mixing element 121 is no longer mixed with air before entering the burner 115, at this time, the entry of primary air into the mixing element 121 is limited; at the same time, the entry of primary air between the mixing element 121 and the burner 115 is also limited. When the box-type gas heating device 100 adopts full premixing combustion, primary air can be introduced between the mixing element 121 and the burner 115 to mix with the mixed gas of the gas and the flue gas.

[0028] At the same time, the number of burners 115 can be one or multiple. When the burners 115 are multiple, the multiple burners 115 can be arranged around the periphery of the inner container 114, so that the outer surface of the inner container 114 is uniformly heated. In addition, the number of the burners 115 and the mixing elements 121 can have various designs, as long as each gas appliance has at least one mixing element 121 to supply gas.

[0029] It should be further noted that the combustion end of the burner 115 can be understood as the end of the burner 115 that can produce a flame; or can be understood as the end of the burner 115 that has a fire hole. In addition, the combustion end of the burner 115 located in the combustion chamber 111 should be understood as: at least the combustion end of the burner 115 is located in the combustion chamber 111, of course, it also includes that the whole burner 115 is located in the combustion chamber 111.

[0030] In addition, the "heat-conducting connection" should be understood as the heat energy on the burner 115 acting and conducting to the inner container 114 to realize the heat connection between the two. Among them, there can be a mechanical connection between the two, or they can be separated without contact, that is, there is no mechanical connection between the two, etc.

[0031] Further, please refer to Figure 1 The burner 115 includes a first burner 1151 and a second burner 1152. The mixing member 121 includes a first mixing member 1213 and a second mixing member 1214. The first mixing member 1213 and the second mixing member 1214 are respectively communicated with the first burner 1151 and the second burner 1152, and are both communicated with the circulating pipe 123. Therefore, during the heating process, part of the flue gas in the circulating pipe 123 flows into the first mixing member 1213 and mixes with the fuel gas flowing into the air inlet pipe 122; after mixing, it enters the first burner 1151 for combustion. Another part of the flue gas in the circulating pipe 123 flows into the second mixing member 1214 and mixes with the fuel gas flowing into the air inlet pipe 122, and after mixing, it flows into the second burner 1152 for combustion. In this way, the mixed gas in different burners 115 is supplied by the corresponding mixing member 121, so that the composition and flow of the mixed gas in different burners 115 can be kept basically consistent, so that the combustion is more stable.

[0032] Further, please refer to Figure 1 The first mixing member 1213 and the circulating pipe 123 are communicated through the first connecting pipe 1217 to ensure that the flue gas in the circulating pipe 123 stably enters the first mixing member 1213. Similarly, the second mixing member 1214 and the circulating pipe 123 are communicated through the second connecting pipe 1218 to ensure that the flue gas in the circulating pipe 123 stably enters the second mixing member 1214.

[0033] It should be noted that the first connecting pipe 1217 and the first mixing member 1213 can adopt a straight-through design or an L-shaped communication design. Among them, when the first connecting pipe 1217 and the first mixing member 1213 are in a straight-through design, the flue gas of the first connecting pipe 1217 flows linearly into the first mixing member 1213, and the flow is not hindered by the inner wall of the first mixing member 1213. When the first connecting pipe 1217 and the first mixing member 1213 are in an L-shaped communication design, the direction of the flue gas of the first connecting pipe 1217 flowing into the first mixing member 1213 will change. For example: the axis of the first connecting pipe 1217 and the flow direction of the mixed gas in the first mixing member 1213 are designed at an angle (such as perpendicular), so that the flue gas flowing into the first mixing member 1213 is hindered, the flow rate in the first mixing member 1213 is slowed down, and the mixing time between the flue gas and the fuel gas is increased, which is beneficial to improve the uniformity of the mixed gas composition.

[0034] Likewise, the second connecting pipe 1218 and the second mixing element 1214 can be in a straight-through design or in an L-shaped design. When the second connecting pipe 1218 and the second mixing element 1214 are in a straight-through design, the flue gas of the second connecting pipe 1218 flows linearly into the second mixing element 1214 without being hindered by the inner wall of the second mixing element 1214. When the second connecting pipe 1218 and the second mixing element 1214 are in an L-shaped design, the direction of the flue gas of the second connecting pipe 1218 changes when it flows into the second mixing element 1214. For example, the axis of the second connecting pipe 1218 and the flow direction of the mixed gas in the second mixing element 1214 are designed at an angle (e.g., perpendicular to each other), so that the flue gas flowing into the second mixing element 1214 is hindered, its flow rate in the second mixing element 1214 is slowed down, the mixing time of the flue gas and the fuel gas is increased, and the uniformity of the mixed gas composition is improved.

[0035] In addition, the axis of the first connecting pipe 1217 and the axis of the circulation pipe 123 can also be designed at an angle (e.g., perpendicular to each other). The axis of the second connecting pipe 1218 and the axis of the circulation pipe 123 can also be designed at an angle (e.g., perpendicular to each other). Meanwhile, the connection position of the first connecting pipe 1217 on the circulation pipe 123 is closer to the exhaust structure 113 than the connection position of the second connecting pipe 1218 on the circulation pipe 123, so that the flue gas in the circulation pipe 123 is preferentially distributed in the first connecting pipe 1217 and then in the second connecting pipe 1218.

[0036] In one embodiment, please refer to Figure 1 The first burner 1151 and the second burner 1152 are respectively located on opposite sides of the inner container 114. In this way, the opposite sides of the inner container 114 are effectively heated, so that the heating of the inner container 114 is more uniform.

[0037] Specifically, please refer to Figure 1 The first burner 1151 is located above the inner container 114, and the second burner 1152 is located below the inner container 114.

[0038] In one embodiment, please refer to Figure 3The gas supply assembly 120 further comprises a first control valve 1215 and a second control valve 1216. The first control valve 1215 is used to control the flow amount of the flue gas in the circulation pipe 123 into the first mixing member 1213. The second control valve 1216 is used to control the flow amount of the flue gas in the circulation pipe 123 into the second mixing member 1214. Thus, the flue gas flow in the first mixing member 1213 can be controlled by the first control valve 1215 to improve the combustion characteristics of the mixed gas entering the first burner 1151, effectively controlling the occurrence of the combustion risk of the first burner 1151. At the same time, the flue gas flow in the second mixing member 1214 can be controlled by the second control valve 1216, which can also improve the combustion characteristics of the mixed gas entering the second burner 1152 to reduce the occurrence of the combustion risk.

[0039] Optionally, the first control valve 1215 and the second control valve 1216 can be, but are not limited to, stop valves, ball valves, proportional valves, butterfly valves, etc.

[0040] It should be noted that the first control valve 1215 can be installed on the circulation pipe 123 or the first connecting pipe 1217. When the first control valve 1215 is installed on the first connecting pipe 1217, it will not affect the gas supply of other mixing members 121 on the circulation pipe 123. Similarly, the second control valve 1216 can also be installed on the circulation pipe 123 or the second connecting pipe 1218.

[0041] In one embodiment, referring to Figure 1 The gas inlet pipe 122 comprises a main pipe 1222 and first and second branch pipes 1223 and 1224 respectively connected to the main pipe 1222. The first branch pipe 1223 is in communication with the first mixing member 1213, and the second branch pipe 1224 is in communication with the second mixing member 1214. In this way, the gas is stably introduced into the first and second mixing members 1213 and 1214 through the first and second branch pipes 1223 and 1224, respectively.

[0042] It should be noted that there are various designs for the communication between the first branch pipe 1223 and the first mixing member 1213, such as: opening on the first mixing member 1213 and connecting the port of the first branch pipe 1223 to the edge of the opening to realize the communication between them; or inserting the first branch pipe 1223 through the opening into the first mixing member 1213 to realize the communication, etc. Of course, attention should be paid to the sealing between the first branch pipe 1223 and the first mixing member 1213, for example, welding sealing between them.

[0043] Meanwhile, the communication between the second branch pipe 1224 and the second mixing element 1214 can be achieved in various ways, such as: an opening is formed on the second mixing element 1214, and the port of the second branch pipe 1224 is connected to the edge of the opening to achieve the communication between the two; or the end of the second branch pipe 1224 is inserted into the second mixing element 1214 through the opening to achieve the communication, etc. Of course, when communicating, attention should be paid to the sealing between the second branch pipe 1224 and the second mixing element 1214, for example, welding sealing between the second branch pipe 1224 and the second mixing element 1214.

[0044] Specifically, please refer to Figure 1 , the end of the first branch pipe 1223 is inserted into the first mixing element 1213 to achieve the communication between the two. Meanwhile, for the convenience of gas delivery, a nozzle 1221 can be arranged on the first branch pipe 1223, and the nozzle 1221 is located in the first mixing element 1213. Similarly, the end of the second branch pipe 1224 is inserted into the second mixing element 1214 to achieve the communication between the two. For the convenience of gas delivery, a nozzle 1221 can be arranged on the second branch pipe 1224, and the nozzle 1221 is located in the second mixing element 1214. In this way, the nozzle 1221 can make the gas better delivered to the mixing element 121, so as to ensure the stable combustion.

[0045] In one embodiment, please refer to Figure 1 , the gas inlet pipe 122 includes a first gas valve 1225 and a second gas valve 1226. The first gas valve 1225 is used to control the amount of gas in the first branch pipe 1223 into the first mixing element 1213. The second gas valve 1226 is used to control the amount of gas in the second branch pipe 1224 into the second mixing element 1214. In this way, the first gas valve 1225 and the second gas valve 1226 can respectively control the amount of gas into the first mixing element 1213 and the second mixing element 1214, so as to effectively control the combustion of the box-type gas heating device 100.

[0046] In one embodiment, please refer to Figure 1 , the smoke exhaust structure 113 includes a smoke exhaust pipe 1131 and a manifold 1134. The smoke exhaust pipe 1131 is in communication with the combustion chamber 111 at one end and is in communication with the outside of the box body 112 at the other end. The circulation pipe 123 is in communication with the smoke exhaust pipe 1131 through the manifold 1134. As can be seen, during the heating process, the flue gas in the combustion chamber 111 enters the smoke exhaust pipe 1131, and part of the flue gas is discharged out of the box body 112 through the smoke exhaust pipe 1131; and the other part of the flue gas flows into the circulation pipe 123 through the manifold 1134 to participate in the premixed combustion of the gas.

[0047] It should be noted that the cross-sectional shape of the smoke exhaust pipe 1131 can be various designs, such as: the cross-sectional shape of the smoke exhaust pipe 1131 can be but not limited to circular, oval, square, rectangular, pentagonal, etc.

[0048] Further, referring to Figure 1 , the smoke exhaust pipe 1131 comprises a first pipe section 1132 and a second pipe section 1133. The first pipe section 1132 is in communication with the combustion chamber 111. The second pipe section 1133 and the manifold 1134 are both in communication with the first pipe section 1132, and the end of the second pipe section 1133 away from the first pipe section 1132 is in communication with the outside of the box body 112. In this way, when the flue gas in the combustion chamber 111 enters the first pipe section 1132, part of the flue gas is diverted into the second pipe section 1133 to be discharged outside the box body 112; and the other part is diverted into the manifold 1134 to participate in subsequent premixed combustion.

[0049] It should be noted that there are various designs for the installation of the second pipe section 1133 and the manifold 1134 on the first pipe section 1132, such as: the second pipe section 1133 and the manifold 1134 are distributed on the same side of the first pipe section 1132; or the second pipe section 1133 and the manifold 1134 are distributed on opposite sides of the first pipe section 1132, etc. At the same time, there are also various designs for the relationship between the communication position of the second pipe section 1133 on the first pipe section 1132 and the communication position of the manifold 1134 on the first pipe section 1132, such as: the communication position of the manifold 1134 on the first pipe section 1132 is closer to the combustion chamber 111 relative to the communication position of the second pipe section 1133 on the first pipe section 1132 (i.e. the communication position of the manifold 1134 on the first pipe section 1132 is lower than the communication position of the second pipe section 1133 on the first pipe section 1132), which makes the flue gas in the first pipe section 1132 flow into the manifold 1134 first, to ensure that the amount of flue gas participating in premixing is sufficient, further reducing the risk of combustion explosion in the combustion chamber 111. Of course, the communication positions of the two can also be kept at the same height, etc.

[0050] It should also be noted that the flue gas flow direction in the second pipe section 1133 and the flue gas flow direction in the manifold 1134 can be kept consistent or opposite.

[0051] In addition, the arrangement between the axis of the first pipe section 1132 and the axis of the manifold 1134 also has various designs, such as: the angle between the axis of the first pipe section 1132 and the axis of the manifold 1134 is an acute angle, an obtuse angle or a right angle.

[0052] Specifically, referring to Figure 1 , the axis of the first pipe section 1132 and the axis of the manifold 1134 are arranged perpendicularly. In order to facilitate the understanding of the axis of the first pipe section 1132 and the axis of the manifold 1134, taking Figure 1 as an example, the axis of the first pipe section 1132 is represented by T1 in Figure 1 ; and the axis of the manifold 1134 is represented by T2 in Figure 1 .

[0053] In one embodiment, please refer to Figure 1 The air supply assembly 120 further comprises a circulating fan 124. The air inlet end of the circulating fan 124 is in communication with the manifold 1134, and the air outlet end of the circulating fan 124 is in communication with the circulating pipe 123. In this way, the circulating fan 124 provides sufficient power for the flue gas to enter the circulating pipe 123, ensuring that the amount of flue gas entering the mixing member 121 remains sufficient.

[0054] In one embodiment, please refer to Figure 1 The mixing member 121 is shaped with a mixing chamber 1211 and a gas supply flow passage 1212 in communication with the mixing chamber 1211. The circulating pipe 123 is in communication with the mixing chamber 1211. The gas inlet pipe 122 is in communication with the gas supply flow passage 1212, and the gas supply flow passage 1212 is in communication with the burner 115. In this embodiment, the mixing member 121 is specifically designed with the mixing chamber 1211 and the gas supply flow passage 1212, so that the flue gas enters the gas supply flow passage 1212 and the flue gas enters the mixing chamber 1211, so that the flue gas and the flue gas are mixed in the gas supply flow passage 1212 to obtain mixed gas with uniform mixing, effectively improving the combustion characteristics of the mixed gas. After mixing, the mixed gas is uniformly delivered to the burner 115 through the gas supply flow passage 1212 for stable combustion to achieve stable heating.

[0055] It should be noted that the gas inlet pipe 122 and the gas supply flow passage 1212 can be in communication in the following ways: the gas inlet pipe 122 directly extends into the gas supply flow passage 1212; or the gas inlet pipe 122 is located at one end of the gas supply flow passage 1212, but the pipe opening of the gas inlet pipe 122 is arranged towards the gas supply flow passage 1212 to maintain communication between the gas inlet pipe 122 and the gas supply flow passage 1212.

[0056] It should be further noted that the first mixing member 1213 and the second mixing member 1214 are only called differently, and have the same design in terms of features, i.e. the mixing member 121 has a mixing chamber 1211 and a gas supply flow passage 1212; similarly, the first mixing member 1213 and the second mixing member 1214 also have a mixing chamber 1211 and a gas supply flow passage 1212.

[0057] When the cabinet type gas heating device 100 adopts atmospheric combustion, the mixing chamber 1211 and the gas supply flow passage 1212 are used to limit the entry of primary air, i.e. the mixing chamber 1211 and the gas supply flow passage 1212 are designed by their own structure to only allow flue gas to enter and mix. At this time, the primary air cannot enter the mixing chamber 1211 and the gas supply flow passage 1212 by means of injection or blowing of the fan, so that the flue gas and the flue gas are mixed and no longer mixed with the primary air. Among them, "primary air" refers to the air that is premixed with the flue gas before entering the burner 115.

[0058] Further, please refer to Figure 2, the cross-sectional area S1 of the gas supply channel 1212 increases from the end of the gas supply channel 1212 close to the mixing chamber 1211 to the end of the gas supply channel 1212 close to the burner 115. The "increase" can include gradual increase, or first increase, then remain unchanged, and then increase, so that the gas supply channel 1212 is designed in an expanding structure, slows down the flow rate of the mixed gas in the gas supply channel 1212, ensures stable air intake in the burner 115, and improves the combustion characteristics.

[0059] In one embodiment, referring to Figure 2 , the cross-sectional area S2 of the mixing chamber 1211 decreases from the end of the mixing chamber 1211 away from the gas supply channel 1212 to the end of the mixing chamber 1211 close to the gas supply channel 1212, so as to form an ejector area 1219 between the mixing chamber 1211 and the gas supply channel 1212. The intake pipe 122 extends into the ejector area 1219. That is, the closer the mixing chamber 1211 is to the gas supply channel 1212, the smaller the cross-sectional area S2, which can accelerate the flow rate of the mixed gas into the gas supply channel 1212, so that the gas can form an ejector force in the ejector area 1219, attract the flue gas in the mixing chamber 1211 to flow towards the gas supply channel 1212, mix with the gas, and thus facilitate stable combustion.

[0060] Specifically, referring to Figure 1 , the cross-sectional area S2 of the mixing chamber 1211 decreases from the end of the mixing chamber 1211 away from the gas supply channel 1212 to the end of the mixing chamber 1211 close to the gas supply channel 1212; the cross-sectional area S1 of the gas supply channel 1212 increases from the end of the gas supply channel 1212 close to the mixing chamber 1211 to the end of the gas supply channel 1212 close to the burner 115, so that the mixing chamber 1211 and the gas supply channel 1212 form an ejector area 1219 with the smallest cross-sectional area. At this time, the nozzle 1221 on the intake pipe 122 is located in the ejector area 1219.

[0061] On the basis of any of the above embodiments, the box body 112 is provided with an air inlet (not shown). The air inlet is in communication with the combustion chamber 111 to provide secondary air for combustion of the burner 115, ensure sufficient combustion of the gas, and improve the combustion characteristics of the burner 115.

[0062] In the description of the application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does 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 of the application.

[0063] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0064] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like 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, unless otherwise explicitly limited. 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.

[0065] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0066] It is to be understood that the terms "fixedly mounted" and "fixedly attached" should be interpreted broadly to include a direct attachment as well as an indirect attachment via one or more intermediary members. It is further to be understood that the terms "connected" and "connected" should be interpreted broadly to include a direct connection as well as an indirect connection via one or more intermediary members. As used herein the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", "lateral", "longitudinal", "length", "width", "height", and "depth", as well as derivatives thereof (e.g., "horizontally", "downwardly", "upwardly", etc.) should be interpreted to be relative terms, only for the purpose of illustration, and not by way of limitation.

[0067] Any of the technical features of the above-described embodiments can be combined with each other, and for the sake of brevity, not all possible combinations are described, however, any combination of the technical features should be considered as within the scope of the present specification.

[0068] The above-described embodiments are merely illustrative of several embodiments of the present application and do not limit the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements should be considered as within the scope of the present application. Therefore, the scope of the patent should be determined by the appended claims.

Claims

1. A cabinet gas-fired heating appliance characterized by, The box type gas heating device (100) comprises: a heating body (110) comprising a box body (112), an inner container (114), a combustion chamber (111), a smoke exhaust structure (113) and a burner (115), the combustion chamber (111) being arranged in the box body (112), the inner container (114) being arranged in the combustion chamber (111), and the combustion end of the burner (115) being arranged in the combustion chamber (111) and being in heat conduction connection with the inner container (114); a gas supply assembly (120) comprising: a mixing member (121) in communication with the first end of the burner (115) to supply mixed gas to the burner (115); a gas inlet pipe (122) and a circulation pipe (123) both in communication with the second end of the mixing member (121), the gas inlet pipe (122) being used for supplying gas to the mixing member (121), and the circulation pipe (123) also being in communication with the smoke exhaust structure (113) to supply part or all of the flue gas in the combustion chamber (111) to the mixing member (121); a mixing cavity (1211) and a gas supply flow channel (1212) in communication with the mixing cavity (1211) are formed in the mixing member (121), the circulation pipe (123) is in communication with the mixing cavity (1211), an eduction area (1219) is formed between the mixing cavity (1211) and the gas supply flow channel (1212), one end of the gas inlet pipe (122) extends into the eduction area (1219), and the gas supply flow channel (1212) is in communication with the burner (115); the mixing cavity (1211) and the gas supply flow channel (1212) are both used for limiting the entry of primary air.

2. The cabinet gas-fired heating appliance of claim 1, wherein, The burner (115) comprises a first burner (1151) and a second burner (1152), the mixing member (121) comprises a first mixing member (1213) and a second mixing member (1214), the first mixing member (1213) and the second mixing member (1214) are in corresponding communication with the first burner (1151) and the second burner (1152) respectively, and are both in communication with the circulation pipe (123).

3. The cabinet gas-fired heating appliance of claim 2, wherein, The first burner (1151) and the second burner (1152) are respectively arranged on opposite sides of the inner container (114).

4. The cabinet gas-fired heating appliance of claim 2, wherein, The gas supply assembly (120) further comprises a first control valve (1215) and a second control valve (1216), the first control valve (1215) is used for controlling the flow amount of flue gas in the circulation pipe (123) to the first mixing member (1213), and the second control valve (1216) is used for controlling the flow amount of flue gas in the circulation pipe (123) to the second mixing member (1214).

5. The cabinet gas-fired heating appliance of claim 2, wherein, The air inlet pipe (122) comprises a main pipe (1222) and first and second branch pipes (1223, 1224) respectively connected to the main pipe (1222), the first branch pipe (1223) being connected to the first mixing element (1213), and the second branch pipe (1224) being connected to the second mixing element (1214).

6. The cabinet gas-fired heating appliance of claim 5, wherein, The air inlet pipe (122) comprises first and second gas valves (1225, 1226), the first gas valve (1225) being used to control the amount of gas in the first branch pipe (1223) entering the first mixing element (1213), and the second gas valve (1226) being used to control the amount of gas in the second branch pipe (1224) entering the second mixing element (1214).

7. The cabinet gas-fired heating appliance of claim 1, wherein, The smoke exhaust structure (113) comprises a smoke exhaust pipe (1131) and a manifold (1134), one end of the smoke exhaust pipe (1131) being connected to the combustion chamber (111), the other end of the smoke exhaust pipe (1131) being connected to the outside of the box (112), and the circulation pipe (123) being connected to the smoke exhaust pipe (1131) through the manifold (1134).

8. The cabinet gas-fired heating appliance of claim 7, wherein, The air supply assembly (120) further comprises a circulation fan (124), the air inlet end of the circulation fan (124) being connected to the manifold (1134), and the air outlet end of the circulation fan (124) being connected to the circulation pipe (123).

9. The cabinet gas-fired heating appliance of claim 7, wherein, The smoke exhaust pipe (1131) comprises first and second pipe sections (1132, 1133), the first pipe section (1132) being connected to the combustion chamber (111), and the second pipe section (1133) being connected to the manifold (1134) and being connected to the first pipe section (1132), one end of the second pipe section (1133) being connected to the outside of the box (112) and being away from the first pipe section (1132).

10. A cabinet gas-fired heating appliance as set forth in any of claims 1-9, characterized by, The box (112) is provided with an air inlet, the air inlet being connected to the combustion chamber (111) to provide secondary air for combustion of the burner (115).

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