CN216953523U - Box type gas heating device - Google Patents

Abstract

The utility model relates to a box type gas heating device, which is characterized in that gas is conveyed into a combustor through a gas inlet pipe to be combusted in the heating process, so that high-temperature flue gas is formed in a combustion chamber. The formed high-temperature smoke gas is contacted with the inner container for heat exchange so as to heat food, tableware or other articles in the inner container. Because the circulating pipe is arranged between the mixing part and the smoke exhaust structure, part of smoke in the smoke exhaust structure is guided into the mixing part and is mixed with fuel gas in the air inlet pipe to replace air for primary premixing. And because the oxygen content in the flue gas is far lower than that in the air, such as: the oxygen-containing gas is only 1/3-1/2 of air, so under the constraint condition of the same limited oxygen amount upper limit, the flow rate of the flue gas mixed with the gas is allowed to be about 2-3 times of that of the air, the gas concentration is greatly diluted, the combustion speed of the gas mixture is obviously reduced, the combustion potential is effectively reduced, the gas mixture is made to be incombustible in a conveying state, and the risk of deflagration in the combustion chamber is effectively reduced.

Description

Box type gas heating device

Technical Field

The utility model relates to the technical field of gas combustion, in particular to a box type gas heating device.

Background

As heating equipment, the box-type gas heating device is high in heating efficiency and high in temperature rise speed, and is deeply loved by users, such as: gas-fired ovens, gas-fired steam boxes, and the like. In the heating process of the traditional box type gas heating device, when gas with higher burning speed is used, because the burning potential of the gas is larger, after the gas is mixed with primary air, the gas concentration of the mixed gas is already in a burning region, and deflagration is easy to occur in a burner or a burning chamber, so that the use of the box type gas heating device is influenced, and even safety accidents are caused; and also hinders the utilization of such gases.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a box type gas heating device which can effectively improve the combustion characteristic of mixed gas, reduce the risk of explosion and ensure stable and safe heating; meanwhile, the gas with higher burning speed is convenient to use.

The first technical problem is solved by the following technical scheme:

a box gas heating apparatus, the box gas heating apparatus comprising: the heating device comprises a heating body, a heating device and a control device, wherein the heating body comprises a box body, an inner container, a combustion chamber, a smoke exhaust structure and a burner, the combustion chamber is arranged in the box body, the inner container is positioned in the combustion chamber, and the combustion end of the burner is positioned in the combustion chamber and is connected with the inner container in a heat conduction manner; the gas supply assembly comprises a gas inlet pipe, a circulating pipe and a mixing part, wherein the first end of the mixing part is communicated with the burner so as to supply mixed gas to the burner; the air inlet pipe and the circulating pipe are communicated with the second end of the mixing part (121), the air inlet pipe is used for supplying fuel gas to the mixing part, and the circulating pipe is further communicated with the smoke exhaust structure and used for partially or completely supplying the flue gas in the combustion chamber to the mixing part.

Compared with the background art, the box type gas heating device has the beneficial effects that: in the heating process, gas is conveyed into the combustor through the gas inlet pipe to be combusted, so that high-temperature flue gas is formed in the combustion chamber. The formed high-temperature smoke gas is contacted with the inner container for heat exchange so as to heat food, tableware or other articles in the inner container. Because the circulating pipe is arranged between the mixing part and the smoke exhaust structure, part of smoke in the smoke exhaust structure is guided into the mixing part and is mixed with fuel gas in the air inlet pipe to replace air for primary premixing. And because the oxygen content in the flue gas is far lower than that in the air, such as: the oxygen-containing gas is only 1/3-1/2 of air, so under the constraint condition of the same limited oxygen amount upper limit, the flow rate of flue gas mixed with the gas is allowed to be about 2-3 times of that of the air, the gas concentration is greatly diluted, the combustion speed of the gas mixture is obviously reduced, the combustion potential is reduced by 35-50%, the gas mixture is made to be incombustible in a conveying state, and the risk of deflagration in a combustion chamber is effectively reduced. Meanwhile, the characteristics of the mixed gas obtained by diluting the fuel gas are similar to those of other fuel gases with lower combustion potential, so that the fuel gas with high combustion speed is convenient to use and beneficial to the development of the fuel gas with high combustion speed.

In one embodiment, the burner includes a first burner and a second burner, the mixing element includes a first mixing element and a second mixing element, the first mixing element and the second mixing element are respectively communicated with the first burner and the second burner, and are communicated with the circulation pipe.

In one embodiment, the first burner and the second burner are located on opposite sides of the inner bladder, respectively.

In one embodiment, the gas supply assembly further comprises a first control valve for controlling the flow of the flue gas in the circulation pipe into the first mixing part and a second control valve for controlling the flow of the flue gas in the circulation pipe into the second mixing part.

In one embodiment, the air inlet pipe comprises a main pipe, and a first branch pipe and a second branch pipe which are respectively communicated with the main pipe, wherein the first branch pipe is communicated with the interior of the first mixing part, and the second branch pipe is communicated with the interior of the second mixing part.

In one embodiment, the intake manifold includes a first air valve for controlling the amount of gas in the first branch into the first mixing element and a second air valve for controlling the amount of gas in the second branch into the second mixing element.

In one embodiment, the smoke exhaust structure comprises a smoke exhaust pipe and a manifold, one end of the smoke exhaust pipe is communicated with the combustion chamber, the other end of the smoke exhaust pipe is communicated with the outside of the box body, and the circulating pipe is communicated with the smoke exhaust pipe through the manifold.

In one embodiment, the air supply assembly further comprises a circulating fan, an air inlet end of the circulating fan is communicated with the manifold, and an air outlet end of the circulating fan is communicated with the circulating pipe.

In one embodiment, the smoke exhaust pipe comprises a first pipe section and a second pipe section, the first pipe section is communicated with the combustion chamber, the second pipe section and the manifold are communicated with the first pipe section, and one end, far away from the first pipe section, of the second pipe section is communicated with the outside of the box body.

In one embodiment, a mixing cavity and a gas supply flow channel communicated with the mixing cavity are formed in the mixing part, the circulating pipe is communicated with the mixing cavity, the gas inlet pipe is communicated with the gas supply flow channel, and the gas supply flow channel is communicated with the combustor.

In one embodiment, the box body is provided with an air inlet which is communicated with the combustion chamber to provide secondary air for the combustion of the combustor.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a box-type gas-fired heating apparatus according to an embodiment;

FIG. 2 is an enlarged view of the structure at circle A in FIG. 1;

fig. 3 is a schematic structural diagram of a box type gas heating device with a first control valve and a second control valve in one embodiment.

Reference numerals:

100. a box-type gas heating device; 110. heating the body; 111. a combustion chamber; 112. a box body; 113. a smoke evacuation structure; 1131. a smoke exhaust pipe; 1132. a first tube section; 1133. a second tube section; 1134. a manifold; 114. an inner container; 115. a burner; 1151. a first burner; 1152. a second combustor; 120. a gas supply assembly; 121. a mixing member; 1211. a mixing chamber; 1212. an air supply flow channel; 1213. a first mixing member; 1214. a second mixing member; 1215. a first control valve; 1216. a second control valve; 1217. a first connecting pipe; 1218. a second connecting pipe; 1219. an ejection region; 122. an air inlet pipe; 1221. a nozzle; 1222. a main tube; 1223. a first branch pipe; 1224. a second branch pipe; 1225. a first air valve; 1226. a second air valve; 123. a circulation pipe; 124. and a circulating fan.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In one embodiment, referring to fig. 1, a box-type gas heating apparatus 100, the box-type gas heating apparatus 100 includes: the heating body 110 and the gas supply assembly 120. The heating body 110 includes a case 112, an inner container 114, a combustion chamber 111, a smoke exhausting structure 113, and a burner 115. The combustion chamber 111 is provided in the case 112. The inner container 114 is located in the combustion chamber 111. The combustion end of the burner 115 is located within the combustion chamber 111 and is thermally conductively connected to the inner bladder 114. The gas supply assembly 120 includes a gas inlet pipe 122, a circulation pipe 123, and a mixing part 121. The mixing member 121 communicates at a first end with the burner 115 to supply the mixture to the burner 115. An intake pipe 122 and a circulation pipe 123 are both communicated with the second end of the mixing member 121, and the intake pipe 122 is used to supply the fuel gas to the mixing member 121. The recycling pipe 123 is also in communication with the fume exhaust structure 113 for feeding part or all of the fumes inside the combustion chamber 111 into the mixing element 121.

In the heating process, the gas in the box-type gas heating apparatus 100 is supplied to the burner 115 through the gas inlet pipe 122 to be burned, so that high-temperature flue gas is formed in the combustion chamber 111. The formed high-temperature flue gas 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. Because the circulation pipe 123 is arranged between the mixing part 121 and the smoke exhausting structure 113, part of the smoke in the smoke exhausting structure 113 is guided into the mixing part 121 and mixed with the fuel gas in the mixing part 121 to replace the air for primary premixing. And because the oxygen content in the flue gas is far lower than that in the air, such as: the oxygen-containing gas is only 1/3-1/2 of air, so under the constraint condition of the same limited upper limit of oxygen amount, the flow rate of flue gas mixed with the gas is allowed to be about 2-3 times of that of the air, the gas concentration is greatly diluted, the combustion speed of the gas mixture is obviously reduced, the combustion potential is reduced by 35-50%, the gas mixture is made to be incombustible in a conveying state, and the risk of deflagration in the combustion chamber 111 is effectively reduced. Meanwhile, the characteristics of the mixed gas obtained by diluting the fuel gas are similar to those of other fuel gases with lower combustion potential, so that the fuel gas with high combustion speed is convenient to use and beneficial to the development of the fuel gas with high combustion speed. In addition, the flame temperature in the combustion process can be effectively reduced by using a flue gas circulation mode, the generation of nitrogen oxides is favorably inhibited, and the control of pollutants in the discharged smoke is improved, so that the environmental protection index of the box-type gas heating device 100 is correspondingly improved.

It should be noted that, when the box-type gas heating apparatus 100 adopts atmospheric combustion, the mixed gas of the gas and the flue gas in the mixing part 121 is not mixed with the air before entering the burner 115, and at this time, the mixing part 121 limits the entry of the primary air; while the introduction of primary air is also limited between the mixing element 121 and the burner 115. When the box gas heating device 100 is fired with full premixing, primary air may be introduced between the mixing element 121 and the burner 115 to mix with the mixture of gas and flue gas.

Meanwhile, the number of the burners 115 may be one or more. When there are a plurality of burners 115, the plurality of burners 115 may be disposed 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 correspondence between the burners 115 and the mixing members 121 is designed in various ways, so that each burner can be supplied with gas by at least one mixing member 121.

It should be noted that the burning end of the burner 115 is understood to be an end of the burner 115 where a flame can be generated; also understood is the end of the burner 115 having the fire holes. In addition, the location of the combustion end of the burner 115 within the combustion chamber 111 should be understood as: the burner 115 has at least a burning end located in the combustion chamber 111, and it is understood that the burner 115 is located entirely in the combustion chamber 111.

In addition, "thermally conductively coupled" is understood to mean that heat from the burner 115 can act upon and be conducted to the inner container 114 to effect a thermal coupling therebetween. Wherein, there may be a mechanical connection between the two, or the two may be separated and arranged without contact, that is, there is no mechanical connection between the two, etc.

Further, referring to fig. 1, the combustor 115 includes a first combustor 1151 and a second combustor 1152. Mixing element 121 includes a first mixing element 1213 and a second mixing element 1214. First mixing element 1213 and second mixing element 1214 are in communication with first burner 1151 and second burner 1152, respectively, and are both in communication with recirculation pipe 123. Therefore, during the heating process, a part of the flue gas in the circulating pipe 123 flows into the first mixing element 1213 and is mixed with the fuel gas flowing into the air inlet pipe 122; mixed and then fed to the first burner 1151 for combustion. Another part of the flue gas in the circulation pipe 123 flows into the second mixing part 1214 and is mixed with the fuel gas flowing into the inlet pipe 122, and the mixed gas correspondingly flows into the second combustor 1152 for combustion. In this way, the mixture in different burners 115 is supplied by the corresponding mixing part 121, which ensures that the mixture composition and flow rate in different burners 115 are generally consistent, and the combustion is more stable.

Further, referring to fig. 1, the first mixing element 1213 is communicated with the circulation pipe 123 through a first connection pipe 1217 to ensure that the flue gas in the circulation pipe 123 stably enters the first mixing element 1213. Also, the second mixing part 1214 is communicated with the circulation pipe 123 through the second connection pipe 1218, so that the smoke in the circulation pipe 123 can be stably introduced into the second mixing part 1214.

It should be noted that a straight-through type design or an L-shaped communication type design may be employed between first connecting pipe 1217 and first mixing element 1213. When the first connecting pipe 1217 and the first mixing element 1213 are designed to be straight, the flue gas of the first connecting pipe 1217 flows linearly into the first mixing element 1213 without being obstructed by the inner wall of the first mixing element 1213. When first connection pipe 1217 and first mixing element 1213 are designed to have an L-shaped communication therebetween, the direction in which the flue gas of first connection pipe 1217 flows into first mixing element 1213 is changed. Such as: the axis of first connecting pipe 1217 and the flow direction of the gas mixture in first mixing piece 1213 are the design of contained angle (if set up perpendicularly) for the flue gas that flows into in first mixing piece 1213 is obstructed, slows down its velocity of flow in first mixing piece 1213, in order to increase the mixing time between flue gas and the gas, does benefit to the degree of consistency that improves the gas mixture composition.

Similarly, a straight-through design or an L-shaped communication design may be used between the second connecting tube 1218 and the second mixing element 1214. When the second connecting pipe 1218 is in a straight-through design with the second mixing part 1214, the smoke of the second connecting pipe 1218 flows linearly into the second mixing part 1214 without being obstructed by the inner wall of the second mixing part 1214. When the second connection pipe 1218 is in L-shaped communication with the second mixing element 1214, the direction of the smoke flowing into the second mixing element 1214 from the second connection pipe 1218 is changed. Such as: the axis of the second connecting pipe 1218 and the flowing direction of the mixed gas in the second mixing part 1214 are designed to form an included angle (such as vertically arranged), so that the smoke flowing into the second mixing part 1214 is blocked, the flow rate of the smoke in the second mixing part 1214 is reduced, the mixing time between the smoke and the gas is prolonged, and the uniformity of the components of the mixed gas is improved.

In addition, the axis of the first connecting pipe 1217 and the axis of the circulation pipe 123 may be disposed at an angle (e.g., vertically, etc.). The axis of the second connection pipe 1218 may also be disposed at an angle (e.g., vertically, etc.) to the axis of the circulation pipe 123. Meanwhile, the communication position of the first connection pipe 1217 on the circulation pipe 123 is closer to the smoke evacuation structure 113 than the communication position of the second connection pipe 1218 on the circulation pipe 123, so that the smoke in the circulation pipe 123 is preferentially distributed in the first connection pipe 1217 and then in the second connection pipe 1218.

In one embodiment, referring to fig. 1, the first and second burners 1151 and 1152 are disposed at opposite sides of the liner 114. Thus, the two opposite sides of the inner container 114 are effectively heated, and the inner container 114 is heated more uniformly.

Specifically, referring to fig. 1, the first burner 1151 is located above the inner container 114, and the second burner 1152 is located below the inner container 114.

In one embodiment, referring to fig. 3, the gas supply assembly 120 further includes a first control valve 1215 and a second control valve 1216. The first control valve 1215 is used to control the amount of flow of flue gas in the circulation pipe 123 into the first mixing element 1213. The second control valve 1216 is used to control the flow of the flue gas in the circulation pipe 123 into the second mixing element 1214. It can be seen that the first control valve 1215 can be used to control the flow rate of flue gas in the first mixing element 1213, so as to improve the combustion characteristics of the mixture entering the first combustor 1151, and effectively control the occurrence of the explosion risk of the first combustor 1151. At the same time, the second control valve 1216 can be used to control the flow of flue gas into the second mixing element 1214, which also improves the combustion characteristics of the mixture entering the second combustor 1152 to reduce the risk of explosion.

Alternatively, the first control valve 1215 and the second control valve 1216 may each be, but are not limited to, a shut-off valve, a ball valve, a proportional valve, a butterfly valve, etc.

It should be noted that the first control valve 1215 may be installed on the circulation pipe 123 and also on the first connection pipe 1217. When the first control valve 1215 is installed on the first connection pipe 1217, it does not affect the air supply of the other mixing element 121 on the circulation pipe 123. Also, a second control valve 1216 may be installed on the circulation pipe 123 and also on the second connection pipe 1218.

In one embodiment, referring to fig. 1, the air inlet pipe 122 includes a main pipe 1222 and a first branch pipe 1223 and a second branch pipe 1224 respectively connected to the main pipe 1222. First branch 1223 communicates with inside of first mixing element 1213 and second branch 1224 communicates with inside of second mixing element 1214. In this manner, combustion gases are stabilized into first mixing element 1213 and second mixing element 1214, respectively, by first branch 1223 and second branch 1224, respectively.

It should be noted that the communication between first branch pipe 1223 and first mixing element 1213 can be designed in various ways, such as: opening on first mixing element 1213, and connecting the port of first branch pipe 1223 to the edge of the opening to communicate with the same; alternatively, one end of first branch pipe 1223 is extended into first mixing element 1213 through an opening to achieve communication and the like. Of course, in communication, attention is paid to the tightness between first branch 1223 and first mixing element 1213, for example: a welded seal or the like is used between first branch 1223 and first mixing element 1213.

Meanwhile, the communication mode between the second branch pipe 1224 and the second mixing element 1214 has various designs, such as: opening on the second mixing piece 1214 and connecting the port of the second branch pipe 1224 at the edge of the opening to realize the communication of the two; alternatively, one end of the second branch pipe 1224 may extend through an opening into the second mixing element 1214 to provide communication, etc. Of course, in communication, care should be taken to seal between the second branch pipe 1224 and the second mixing element 1214, such as: a welded seal or the like is employed between the second branch pipe 1224 and the second mixing element 1214.

Specifically, referring to fig. 1, one end of first branch pipe 1223 extends into first mixing element 1213 to achieve communication therebetween. Meanwhile, to facilitate gas delivery, a nozzle 1221 may be provided on the first branch pipe 1223, and the nozzle 1221 is located in the first mixing member 1213. Similarly, one end of the second branch pipe 1224 extends into the second mixing element 1214 to provide communication therebetween. To facilitate gas delivery, a nozzle 1221 may be disposed on the second branch 1224, with the nozzle 1221 being located within the second mixing element 1214. In this way, the use of the nozzle 1221 allows better delivery of the gas into the mixing member 121, so as to guarantee a stable combustion.

In one embodiment, referring to FIG. 1, the intake conduit 122 includes a first air valve 1225 and a second air valve 1226. First air valve 1225 is used to control the amount of intake air of the gas in first branch pipe 1223 into first mixing element 1213. The second gas valve 1226 is used to control the amount of gas introduced into the second branch pipe 1224 into the second mixing element 1214. In this way, the amount of fuel entering first mixing element 1213 and second mixing element 1214 can be controlled separately by first gas valve 1225 and second gas valve 1226, respectively, to effectively control the combustion of gas-box heater 100.

In one embodiment, referring to fig. 1, the smoke evacuation structure 113 includes a smoke evacuation tube 1131 and a manifold 1134. One end of the smoke exhaust pipe 1131 is communicated with the combustion chamber 111, and the other end is communicated with the outside of the box body 112. The circulation pipe 123 communicates with the exhaust pipe 1131 through a manifold 1134. Therefore, in the heating process, after the flue gas in the combustion chamber 111 enters the smoke exhaust pipe 1131, a part of the flue gas is exhausted out of the box body 112 through the smoke exhaust pipe 1131; while another portion of the flue gas flows into the recirculation pipe 123 through the manifold 1134 to participate in the premixed combustion of the gas.

It should be noted that the cross-sectional shape of the exhaust 1131 can be designed in various ways, such as: the cross-sectional shape of the exhaust 1131 can be, but is not limited to, circular, oval, square, rectangular, pentagonal, etc.

Further, referring to fig. 1, the smoke exhaust 1131 includes a first pipe section 1132 and a second pipe section 1133. The first tube segment 1132 is in communication with the combustion chamber 111. The second pipe section 1133 and the manifold 1134 are both connected to the first pipe section 1132, and one end of the second pipe section 1133 away from the first pipe section 1132 is connected to the outside of the box 112. Thus, after the flue gas in the combustion chamber 111 enters the first pipe segment 1132, a part of the flue gas is branched to the second pipe segment 1133 to be discharged out of the box 112; another portion is diverted to manifold 1134 to participate in subsequent premixed combustion.

It should be noted that the second pipe section 1133 and the manifold 1134 are respectively installed on the first pipe section 1132 in various ways, such as: the second tube segments 1133 are distributed on the same side of the first tube segments 1132 as the manifold 1134; alternatively, the second tube segments 1133 and the manifold 1134 are distributed on opposite sides of the first tube segments 1132, and so on. Meanwhile, 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 can be designed in various ways, such as: the communication position of the manifold 1134 on the first pipe section 1132 is closer to the combustion chamber 111 than the communication position of the second pipe section 1133 on the first pipe section 1132 (that is, 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), so that the flue gas in the first pipe section 1132 is distributed into the manifold 1134 with the highest priority to ensure that the amount of flue gas participating in premixing is enough, and further reduce the risk of explosion in the combustion chamber 111. Of course, the communication positions of the two may be maintained at the same height.

It should also be noted that the direction of the flow of the flue gas in the second tube section 1133 may be the same as or opposite to the direction of the flow of the flue gas in the manifold 1134.

In addition, the arrangement between the axis of the first tube segment 1132 and the axis of the manifold 1134 may have various designs, such as: the axis of the first tube segment 1132 may be angled at an acute, obtuse, or right angle to the axis of the manifold 1134.

Specifically, referring to FIG. 1, the axis of the first tube segment 1132 is perpendicular to the axis of the manifold 1134. To facilitate an understanding of the axis of the first tube segment 1132 and the axis of the manifold 1134, taking fig. 1 as an example, the axis of the first tube segment 1132 is denoted by T1 in fig. 1; the axis of manifold 1134 is indicated at T2 in FIG. 1.

In one embodiment, referring to fig. 1, the air supply assembly 120 further includes a circulating fan 124. The air inlet end of the circulating fan 124 is communicated with the manifold 1134, and the air outlet end of the circulating fan 124 is communicated 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, so as to ensure that the amount of flue gas entering the mixing part 121 is kept sufficient.

In one embodiment, referring to fig. 1, a mixing chamber 1211 and a gas supply channel 1212 connected to the mixing chamber 1211 are formed in the mixing member 121. The circulation pipe 123 communicates with the mixing chamber 1211. The intake pipe 122 communicates with an air supply runner 1212, and the air supply runner 1212 communicates with the burner 115. Thus, the mixing element 121 is designed to be a mixing chamber 1211 and a gas supply channel 1212, so that the gas enters the gas supply channel 1212, the smoke enters the mixing chamber 1211, the smoke and the gas are mixed in the gas supply channel 1212, a uniformly mixed gas is obtained, and the combustion characteristics of the gas mixture are effectively improved. After mixing, the mixture is uniformly delivered to the burner 115 through the gas supply channel 1212 for stable combustion, so as to achieve stable heating.

It should be noted that the air inlet pipe 122 may communicate with the air supply flow passage 1212 by: the air inlet pipe 122 directly extends into the air supply flow passage 1212; alternatively, the air inlet tube 122 is located at one end of the air supply flow passage 1212, but the nozzle of the air inlet tube 122 is disposed toward the air supply flow passage 1212 so that the air inlet tube 122 is communicated with the air supply flow passage 1212.

It should be noted that the first mixing element 1213 and the second mixing element 1214 are only called differently from the mixing element 121, and have the same design in terms of the features, that is, the mixing element 121 has a mixing chamber 1211 and a gas supply flow channel 1212; similarly, the first mixing element 1213 and the second mixing element 1214 have a mixing chamber 1211 and an air supply channel 1212.

When the box-type gas heating device 100 is burning in the atmosphere, the mixing chamber 1211 and the air supply channel 1212 are both used to limit the entrance of primary air, i.e. the mixing chamber 1211 and the air supply channel 1212 are designed to allow only smoke to enter and mix. At this time, the primary air cannot enter the mixing chamber 1211 and the air supply channel 1212 through injection or blowing by a blower, so that the flue gas and the fuel gas are mixed and then are not mixed with the primary air. Where "primary air" refers to air that is premixed with the combustion gases prior to entering the combustor 115.

Further, referring to FIG. 2, the cross-sectional area S1 of the air supply channel 1212 increases from the end of the air supply channel 1212 near the mixing chamber 1211 to the end of the air supply channel 1212 near the burner 115. Wherein, increasing can include gradually increasing, and can also include increasing first, then unchangeable, increase again etc. like this makes the air feed runner 1212 be the design of expanding structure, slows down the velocity of flow of gas mixture in the air feed runner 1212, guarantees that the air admission is stable in the combustor 115 to improve combustion characteristics.

In one embodiment, referring to FIG. 2, the cross-sectional area S2 of the mixing chamber 1211 decreases from the end of the mixing chamber 1211 that is distal from the air supply channel 1212 to the end of the mixing chamber 1211 that is proximal to the air supply channel 1212, such that an induction zone 1219 is formed between the mixing chamber 1211 and the air supply channel 1212. One end of the air inlet tube 122 extends into the injection zone 1219. That is, the closer the mixing chamber 1211 is to the gas supply channel 1212, the smaller the cross-sectional area S2 is, so that the flow velocity of the mixed gas into the gas supply channel 1212 can be increased, the injection force can be formed in the injection region 1219 by the fuel gas, the flue gas in the mixing chamber 1211 is attracted to flow toward the gas supply channel 1212, and the flue gas is mixed with the fuel gas, thereby being beneficial to ensuring stable combustion.

Specifically, referring to FIG. 1, the cross-sectional area S2 of the mixing chamber 1211 decreases from the end of the mixing chamber 1211 that is distal from the gas supply channel 1212 to the end of the mixing chamber 1211 that is proximal to the gas supply channel 1212; the cross-sectional area S1 of the air supply channel 1212 increases from the end of the air supply channel 1212 adjacent the mixing chamber 1211 to the end of the air supply channel 1212 adjacent the burner 115 such that an exit region 1219 of minimum cross-sectional area is defined between the mixing chamber 1211 and the air supply channel 1212. At this time, the nozzle 1221 of the inlet pipe 122 is positioned in the injection region 1219.

In any of the above embodiments, the box 112 is provided with an air inlet (not shown). The air inlet is communicated with the combustion chamber 111 to provide secondary air for the combustion of the combustor 115, so that the full combustion of gas is ensured, and the improvement of the combustion characteristic of the combustor 115 is facilitated.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A tank gas heating device, characterized in that the tank gas heating device (100) comprises:

the heating device comprises a heating body (110), wherein 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 positioned in the combustion chamber (111), and the combustion end of the burner (115) is positioned in the combustion chamber (111) and is in heat conduction connection with the inner container (114);

a gas supply assembly (120), the gas supply assembly (120) comprising:

a mixing member (121) having a first end communicating with the burner (115) for feeding a mixture to the burner (115);

and the air inlet pipe (122) and the circulating pipe (123) are communicated with the second end of the mixing part (121), the air inlet pipe (122) is used for supplying fuel gas to the mixing part (121), and the circulating pipe (123) is also communicated with the smoke exhaust structure (113) so as to be used for partially or completely supplying the smoke in the combustion chamber (111) to the mixing part (121).

2. The gas-fired heating device according to claim 1, characterized in that said burner (115) comprises a first burner (1151) and a second burner (1152), said mixing element (121) comprises a first mixing element (1213) and a second mixing element (1214), said first mixing element (1213) and said second mixing element (1214) being in corresponding communication with said first burner (1151) and said second burner (1152), respectively, and both being in communication with said circulation duct (123).

3. The gas-fired box heating apparatus according to claim 2, wherein the first burner (1151) and the second burner (1152) are located at opposite sides of the inner container (114), respectively.

4. The gas box heating plant according to claim 2, characterized in that said air supply assembly (120) further comprises a first control valve (1215) and a second control valve (1216), said first control valve (1215) being adapted to control the flow of flue gases in said circulation duct (123) into said first mixing element (1213), said second control valve (1216) being adapted to control the flow of flue gases in said circulation duct (123) into said second mixing element (1214).

5. The box gas heating device according to claim 2, characterized in that the inlet pipe (122) comprises a main pipe (1222) and a first branch pipe (1223) and a second branch pipe (1224) respectively communicating with the main pipe (1222), the first branch pipe (1223) communicating with the inside of the first mixing piece (1213), the second branch pipe (1224) communicating with the inside of the second mixing piece (1214).

6. The gas box heater according to claim 5, characterized in that the inlet pipe (122) comprises a first gas valve (1225) and a second gas valve (1226), the first gas valve (1225) being used to control the amount of gas entering the first branch pipe (1223) into the first mixing part (1213), the second gas valve (1226) being used to control the amount of gas entering the second branch pipe (1224) into the second mixing part (1214).

7. The box type gas heating device according to 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) is communicated with the combustion chamber (111), the other end of the smoke exhaust pipe is communicated with the outside of the box body (112), and the circulating pipe (123) is communicated with the smoke exhaust pipe (1131) through the manifold (1134).

8. The gas box heating device according to claim 7, characterized in that the gas supply assembly (120) further comprises a circulating fan (124), the air inlet end of the circulating fan (124) is communicated with the manifold (1134), and the air outlet end of the circulating fan (124) is communicated with the circulating pipe (123).

9. The box gas heating device according to claim 7, characterized in that the smoke exhaust pipe (1131) comprises a first pipe section (1132) and a second pipe section (1133), the first pipe section (1132) is communicated with the combustion chamber (111), the second pipe section (1133) and the manifold (1134) are communicated with the first pipe section (1132), and one end of the second pipe section (1133) far away from the first pipe section (1132) is communicated with the outside of the box body (112).

10. The box type gas heating device according to any one of claims 1 to 9, wherein a mixing chamber (1211) and a gas supply flow channel (1212) communicated with the mixing chamber (1211) are formed in the mixing member (121), the circulation pipe (123) is communicated with the mixing chamber (1211), the gas inlet pipe (122) is communicated with the gas supply flow channel (1212), and the gas supply flow channel (1212) is communicated with the burner (115); and/or the presence of a gas in the atmosphere,

an air inlet is formed in the box body (112), and the air inlet is communicated with the combustion chamber (111) to provide secondary air for combustion of the combustor (115).

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