MULTI-ZONE INDEPENDENT COMBUSTION AND MIXED HEAT SUPPLY COMBUSTION DEVICE AND GRILL

The present invention discloses a multi-zone independent combustion and mixed heat supply combustion device and a grill, where each fuel is independently combusted in a first combustion chamber and a second combustion chamber, and when an airflow in an air duct flows through the first combustion chamber and the second combustion chamber by means of a blowing device, heat generated by combustion is taken away and flows out of a heat flow outlet to realize multi-zone independent combustion and mixed heat supply.

TECHNICAL FIELD

The present invention belongs to the field of grills, and specifically pertains to a multi-zone independent combustion and mixed heat supply combustion device and a grill.

BACKGROUND

Grills are a type of devices that bake and cook food in the form of hot air, and generally in closed or semi-closed structures. Traditional grills are heated by burning wood and coal. Modern grills have multiple functions, and are subject to electric heating or gas heating.

A traditional grill is typically provided with a combustion cavity under a grilling net, so that fuels such as wood and coal are fed in the combustion cavity for combustion, and heat flow generated by the combustion of the fuels rises to grill the food on the grilling net located above. Typically, a plurality of fuels are used simultaneously, and two combustion modes are available for the plurality of fuels.

In the first mode, the fuels are burned in a mixed state, so that the fuels are centrally burned, and the heat flow generated by the fuels is in a completely mixed state, and the food on the grilling net located above is grilled by the completely mixed heat flow.

In the second mode, the fuels are separately burned at a small spacing, so that the fuels are burned in respective zones, and the heat flow generated by the fuels are partially mixed during respective rise, and the food on the grilling net located above is grilled by a plurality of unmixed heat flows and the partially mixed heat flow.

The above first combustion mode has disadvantages in that: 1. different fuels require different cleaning methods, and the fuels in the mixed state need to be classified again during subsequent cleaning, resulting in inconvenient cleaning; 2. there is only one combustion state for the fuels in the mixed state, so it is impossible to determine combustion conditions of different fuels; and 3. the mixed fuels interact with each other during combustion, and different mixing ratios result in different impacts, resulting in unstable combustion states of the fuels.

The above second combustion mode has disadvantages in that: the heat flows generated by different fuels have different states, and the heat flows of a plurality of different states generated by separate combustion result in uneven heating of the grilling net located above.

SUMMARY

In view of the deficiencies of the prior art, it is an object of the present invention to provide a multi-zone independent combustion and mixed heat supply combustion device and a grill, where each fuel is independently combusted in a first combustion chamber and a second combustion chamber, and when an airflow in an air duct flows through the first combustion chamber and the second combustion chamber by means of a blowing device, heat generated by combustion is taken away and flows out of a heat flow outlet to realize mixed heat supply.

In order to achieve the above object, the present invention provides the following technical solutions.

A multi-zone independent combustion and mixed heat supply combustion device, includes: a combustion bin provided with an air duct therein, where a first combustion chamber and a second combustion chamber are formed in the air duct, the first combustion chamber and the second combustion chamber are configured for fuel combustion to be heated, and a heat flow outlet is formed at an end of the air duct; and a blowing device operative to blow an airflow into the air duct, where the airflow sequentially passes through the first combustion chamber and the second combustion chamber to be heated to form hot air and is discharged from the heat flow outlet.

Preferably, a temperature of the first combustion chamber in a combustion state is lower than a temperature of the second combustion chamber in the combustion state.

In some embodiments, a size of a bin of the first combustion chamber is smaller than a size of a bin of the second combustion chamber to achieve the purpose of having the temperature of the first combustion chamber lower than that of the second combustion chamber in the combustion state.

In further embodiments, a fuel holding density of the first combustion chamber is smaller than a fuel holding density of the second combustion chamber to achieve the purpose of having the temperature of the first combustion chamber lower than that of the second combustion chamber in the combustion state.

In some other embodiments, a combustion heat value of a combustion product introduced into the first combustion chamber is lower than a combustion heat value of a combustion product introduced into the second combustion chamber, which can also achieve the purpose of having the temperature of the first combustion chamber lower than that of the second combustion chamber in the combustion state.

By using the above technical solutions, two different fuels such as wood pellets and charcoal can be respectively introduced into the first combustion chamber and the second combustion chamber for combustion, so that a large amount of heat is generated in the first combustion chamber and the second combustion chamber by combustion, and the airflow in the air duct sequentially passes through the first combustion chamber and the second combustion chamber during the combustion by means of the blowing device to take away hot air in the first combustion chamber and the second combustion chamber, and the hot air is mixed when the airflow flows to the heat flow outlet, which ensures uniform temperature of the airflow, and finally the mixed airflow flow out of the heat flow outlet for heating. Here, due to independent combustion of the fuels, not only can the residual fuels be cleaned separately without classification, which results in convenient cleaning, but also the combustion of each fuel can be observed separately to determine combustion condition of each fuel more accurately, and the fuels do not interfere with each other, which ensure more stable combustion of each fuel. Moreover, since different fuels can be fed simultaneously, the combustion of the wood pellets produce the aroma of fruit wood, while the combustion of the charcoal produces a charcoal grilled flavor, and the two flavors are uniformly mixed to achieve uniform multi-flavored grilling of the grilled food.

As a second aspect of the present invention, there is also provided a grill including a hob and a multi-zone independent combustion and mixed heat supply combustion device described above, where the combustion device is arranged on the hob to supply heat.

In some embodiments, the hob is provided with a braising and roasting cavity thereon, and a heat flow outlet of the combustion device is in communication with the braising and roasting cavity. In further embodiments, the hob is provided thereon with a heating cavity and a grilling net located above the heating cavity, and the heat flow outlet of the combustion device is in communication with the heating cavity.

DESCRIPTION OF THE EMBODIMENTS

Embodiment I

As shown inFIGS.1-7, the present invention discloses a multi-zone independent combustion and mixed heat supply combustion device, including:a combustion bin1formed by splicing a plurality of plates together using riveting, welding and other methods and having a cuboid outer peripheral shape as a whole, where the combustion bin1is provided therein with an air duct11and a first combustion chamber121and a second combustion chamber122which are separated, the first combustion chamber121and the second combustion chamber122are configured for fuel combustion to be heated, and a heat flow outlet119is provided at an end of the air duct11; anda blowing device2operative to blow an airflow into the air duct11, where the airflow sequentially passes through the first combustion chamber121and the second combustion chamber122to be heated to form hot air and is discharged from the heat flow outlet119.

Therefore, two different fuels such as wood pellets and charcoal can be respectively introduced into the first combustion chamber121and the second combustion chamber122for combustion, so that a large amount of heat is generated in the first combustion chamber121and the second combustion chamber122by combustion, and the airflow in the air duct11sequentially passes through the first combustion chamber121and the second combustion chamber122during the combustion by means of the blowing device2to take away hot air in the first combustion chamber121and the second combustion chamber122, and the hot air is mixed when the airflow flows to the heat flow outlet119, which ensures uniform temperature of the airflow, and finally the mixed airflow flow out of the heat flow outlet119for heating. Here, due to independent combustion of the fuels, not only can the residual fuels be cleaned separately without classification, which results in convenient cleaning, but also the combustion of each fuel can be observed separately to determine combustion condition of each fuel more accurately, and the fuels do not interfere with each other, which ensure more stable combustion of each fuel. Moreover, since different fuels can be fed simultaneously, the combustion of the wood pellets produce the aroma of fruit wood, while the combustion of the charcoal produces a charcoal grilled flavor, and the two flavors are uniformly mixed to achieve uniform multi-flavored grilling of the grilled food.

Preferably, a temperature of the first combustion chamber121in a combustion state is lower than a temperature of the second combustion chamber122in the combustion state. Therefore, the airflow passing through the first combustion chamber121and the second combustion chamber122is gradually heated up, resulting in a positive temperature gradient and high heat energy transfer efficiency.

Here, in order to achieve a lower temperature of the first combustion chamber121in the combustion state than that of the second combustion chamber122in the combustion state, the following methods can be used: the first method is to provide a smaller size of a bin (i.e., a first fuel bin51described later) of the first combustion chamber121than that of a bin (i.e., a second fuel bin52described later) of the second combustion chamber122as shown in the drawings, so that the fuel that can be accommodated in the first combustion chamber121is less than the fuel that can be accommodated in the second combustion chamber122, so that the second combustion chamber122generates more heat during combustion, so that the temperature of the second combustion chamber122in the combustion state is higher than that of the first combustion chamber121; the second method is to place less fuel in the first combustion chamber121than in the second combustion chamber122, so that the second combustion chamber122generates more heat during combustion, so that the temperature of the second combustion chamber122in the combustion state is higher than that of the first combustion chamber121; and the third method is to place a combustion product having a higher combustion heat value than a combustion product in the second combustion chamber122in the first combustion chamber121, so that the second combustion chamber122generates more heat during combustion, so that the temperature of the second combustion chamber122in the combustion state is higher than that of the first combustion chamber121. The above three methods can be used simultaneously, or any one or two can be used.

Specifically, the blowing device2consists of a mounting bracket21and a fan motor22provided on the mounting bracket21, the mounting bracket21is mounted on the combustion bin1, and the fan motor22operates to generate the airflow.

In other embodiments, one to three separate combustion cavities are also provided behind the second combustion chamber121for further partitioning, depending on usage requirements.

Specifically, in the present embodiment, the first combustion chamber121and the second combustion chamber122are arranged in a left-right arrangement, so that the airflow in the air duct11sequentially flows through the first combustion chamber121and the second combustion chamber122from left to right.

Moreover, the combustion bin1is provided with a first upper cavity123above the first combustion chamber121and a second upper cavity124above the second combustion chamber122, and the first upper cavity123and the second upper cavity124are separated by a first separator31. Moreover, the first upper cavity123and the second upper cavity124are in a sealed configuration so that the airflow is unable to be discharged through the first upper cavity123and the second upper cavity124.

Therefore, fuels can be added to the first combustion chamber121and the second combustion chamber122when the first upper cavity123and the second upper cavity124are in an open state, and the fuel added to the first combustion chamber121and the fuel added to the second combustion chamber122cannot be mixed with each other in the presence of the first separator31to prevent mixed combustion. In addition, the arrangement of the first upper cavity123and the second upper cavity124can increase a distance between the first combustion chamber121and a refueling position and a distance between the second combustion chamber122and a refueling position, which can realize safe refueling; and more fuels can be added or long strips of firewood can be introduced by means of spaces of the first upper cavity123and the second upper cavity124.

Here, in the present embodiment, the air duct11includes a first air duct111on a left side, a second air duct112on a lower side and a third air duct113on a right side, the first air duct111and the third air duct113are both arranged to extend vertically, and a lower end of the first air duct111is in communication with a left end of the second air duct112; and a lower end of the third air duct113is in communication with a right end of the second air duct112, so that the air duct11has a U-shaped structure as a whole.

In addition, the first combustion chamber121and the second combustion chamber122are arranged in the second air duct112. Correspondingly, the first upper cavity123and the second upper cavity124are located between the first air duct111and the third air duct113, and a left side of the first upper cavity123is attached to the first air duct111, and a right side of the second upper cavity124is attached to the third air duct113.

In addition, the blowing device2is located above a left side of the first air duct111, so that the blowing device2blows the airflow into the first air duct111, and the heat flow outlet119is located at an upper end of the third air duct113.

Therefore, 1. the blowing device2is operative to blow the airflow outside the combustion bin1into the first air duct111, the airflow flows downward in the first air duct111to the second air duct112, and during flow, the first upper cavity123conducts heat to the left to preheat the airflow; 2. the airflow entering the second air duct112flows to the right and sequentially passes through the first combustion chamber121and the second combustion chamber122, and takes away the heat generated by combustion in the first combustion chamber121and the second combustion chamber122through heat conduction while supplementing the first combustion chamber121and the second combustion chamber122with oxygen to ensure more complete combustion of the fuels, then the heated up airflow flows to the right to the third air duct113; and 3, the airflow entering the third air duct113flows upward to the heat flow outlet119, and during flow, the second combustion chamber122conducts heat to the right to maintain a high temperature in the third air duct113to reduce heat loss of the airflow, so that the airflow flowing out of the heat flow outlet119has such high temperature.

Here, in the present embodiment, upper ends of the first upper cavity123and the second upper cavity124are respectively provided with a feed port. Correspondingly, the combustion bin1is provided with a bin cover4above the first upper cavity123and the second upper cavity124for opening and closing the feed port, the bin cover4is opened to supplement fuel into the first upper cavity123and the second upper cavity124through the feed port. Specifically, front and rear sides of the combustion bin1are respectively provided with a first bending guide rail33extending left and right, and front and rear sides of the bin cover4are respectively provided with a first sliding portion34adapted to the first bending guide rail33in a bending manner, so that the bin cover4can slide left and right with the cooperation of the first sliding portion34and the first bending guide rail33, and slides left to open the feed port and slides right to close the feed port.

Therefore, when it is necessary to add fuel, observe combustion in a combustion cavity12, and clean the combustion cavity12, the feed port is opened by sliding the bin cover4to the left, and after the operation is completed, the feed port is closed by sliding the bin cover4to the right.

Here, a right end of the combustion bin1is provided with an extension section13extending upward, and the heat flow outlet119is arranged above the extension section13.

Thus, the arrangement of the extension section13not only allows the heat flow outlet119to be better lifted upward to align with the cavity that needs heating, but also restricts the sliding of the bin cover4to the right under the limit of the extension section13.

Preferably, in the present embodiment, the upper ends of the first air duct111, the first upper cavity123and the second upper cavity124are flush, and the bin cover4is arranged covering the upper ends of the first air duct111, the first upper cavity123and the second upper cavity124; and the first upper cavity123and the second upper cavity124have a height h1, the second air duct112has a height h2, and h1is 3-10 times of h2.

Moreover, in the present embodiment, the combustion bin1is detachably provided with a combustion box5which is located in the second air duct112and has an open upper end. In addition, the combustion box5is provided with a second separator32therein to separate the combustion box5into a first fuel bin51located in the first combustion chamber121and a second fuel bin52located in the second combustion chamber122. Therefore, the combustion box5is arranged so that the fuel is mainly concentrated in the first fuel bin51and the second fuel bin52in the combustion box5for combustion, and the second separator32effectively ensures separation between the first fuel bin51and the second fuel bin52and independent combustion of each fuel. After the combustion is completed, the remaining fuel in the combustion box5can be cleaned off more conveniently by removing the combustion box5.

Specifically, in order to achieve a lower temperature of the first combustion chamber121in the combustion state than that of the second combustion chamber122in the combustion state, the following methods can be used: the first method is to set a volume of the first fuel bin51to 20%-50% of a volume of the second fuel bin52, so that the first fuel bin51has a smaller volume and contains less fuel; the second method is to provide a spacer in the first fuel bin51, so that the spacer structurally arranges the first fuel bin51, so that there is less space available for fuels; and the third method is to cause the first fuel bin51to have the volume the same as that of the second fuel bin52, so that fuels with different combustion heat values can be introduced.

Moreover, a plurality of first communication holes61are respectively provided on front, rear, left, and right peripheral walls of the combustion box5, and correspondingly, a plurality of third communication holes63are respectively provided on the second separator32, so that the airflow flowing from a left side of the second air duct112to the right can flow through the first fuel bin51and the second fuel bin52through the first communication holes61and the second communication holes62, and the airflow enters the first fuel bin51and the second fuel bin52to be directly heated to accelerate heat transfer, and oxygen is supplied to the first fuel bin51and the second fuel bin52to ensure more complete fuel combustion.

Moreover, in the present embodiment, a plurality of second communication holes62are provided on a bottom wall of the combustion box5, the second communication holes62communicate the first fuel bin51with the first combustion chamber121below the first fuel bin51, and communicate the second fuel bin52with the second combustion chamber122below the second fuel bin52, so that the heat in the first fuel bin51and the second fuel bin52can be directly diffused by the air to the first combustion chamber121below the first fuel bin51and the second combustion chamber122below the second fuel bin52, so that the airflow passing through the first combustion chamber121below the first fuel bin51and the second combustion chamber122below the second fuel bin52is heated, so that the subsequent mixed airflow has a higher temperature to improve utilization rate of heat energy. In addition, the second communication holes62also allow ash generated by combustion to escape from the combustion box5to ensure that the fuel in the combustion box5is in full contact with the air to improve combustion efficiency.

Specifically, in the present embodiment, the combustion bin1is respectively provided with a second bending guide rail35extending left and right on front and rear sides of the second air duct112, and correspondingly, front and rear sides of the combustion box5are respectively provided with a second sliding portion36adapted to the second bending guide rails35in a bending manner, so that the second bending guide rails35and the second sliding portions36cooperate to perform left and right sliding. In addition, a left side of the combustion bin1is provided with a disassembly port14, so that the combustion box5slides leftward and exits the combustion bin1from the disassembly port14to achieve disassembly, while assembly is achieved by inserting the combustion box into the disassembly port14and aligning the second bending guide rails35with the second sliding portions36.

Moreover, in the present embodiment, an ash box7is detachably provided below the second air duct112, and the ash box7is fitted to the combustion bin1in a pulling manner, which enables collection of ash under the combustion box5through the ash box7, and allows the ash box7to be pulled and disassembled from the disassembly port14, resulting in convenient ash cleaning.

Moreover, in the present embodiment, the ash box7is provided with a combustion-supporting member8at an upper end thereof, which allows ignition of solid alcohol and other combustion-supporting materials on the combustion-supporting member8, and then the ash box7is inserted into the combustion bin1, so that the combustion product burned below the combustion zone can efficiently support the combustion of the fuel in the combustion zone, resulting in safe combustion support.

Moreover, in the present embodiment, the combustion-supporting member8is a metal stamping member, and the combustion-supporting member8includes a support base81, limiting side walls82bent on left and right sides of the support base81, and hanging portions83bent on front and rear sides of the support base81. In addition, two limiting portions84arranged in front and rear are punched on the support base81, so that a combustion-supporting cavity85is formed by the support base81, the limiting side walls82and the limiting portions84. Therefore, front and rear sides of the combustion-supporting member8are hung on the ash box7by the two hanging portions83, and the combustion-supporting material can be added to the combustion-supporting cavity85to support combustion.

In addition, the support base81and the limiting side walls82are respectively provided with fourth communication holes64thereon, so that the combustion-supporting cavity85is opened in the airflow direction of the second air duct112, and the airflow continuously supplies oxygen to the combustion-supporting material to ensure more sufficient combustion.

Preferably, in the present embodiment, the combustion bin1is provided with a heat-conducting member15having a tapered inner circumference at the heat flow outlet119, so that the heat flow is more concentrated and rapidly discharged upward for heat supply.

Embodiment II

As shown inFIGS.8and9, a grill includes a hob9and a multi-zone independent combustion and mixed heat supply combustion device as described in Embodiment I, where the combustion device is arranged in the hob9, the hob9is provided with a braising and roasting cavity91above the combustion device, and a heat flow outlet119of the combustion device is in communication with the braising and roasting cavity91.

Therefore, an airflow from the heat flow outlet119of the combustion device is directly introduced into the braising and roasting cavity91to maintain the braising and roasting cavity91at a high temperature to grill the food to be grilled in the braising and roasting cavity91, and the airflow is continuously introduced into the braising and roasting cavity91to quicken and mix the airflow in the braising and roasting cavity91to achieve a uniform temperature in the braising and roasting cavity91for uniform grilling. Moreover, since different fuels can be fed simultaneously, the combustion of the wood pellets produce the aroma of fruit wood, while the combustion of the charcoal produces a charcoal grilled flavor, and the two flavors are uniformly mixed and enter the braising and roasting cavity91with the airflow, and the air flow will uniformly grill the braised food with multiple flavors by supplying heat.

A box cover93is hinged on the hob9, so that the box cover93covers the hob9to close the braising and roasting cavity91or is flipped to open the braising and roasting cavity91for grilling operation.

Moreover, a net rack94is respectively provided on left and right sides of the braising and roasting cavity91, and a plurality of vertically arranged support rods95are provided on the net racks94, so that a plurality of grilling nets96can be provided to improve grilling efficiency.

Embodiment III

As shown inFIG.10, a grill includes a hob9and a multi-zone independent combustion and mixed heat supply combustion device as described in Embodiment I, where the combustion device is arranged in the hob9, the hob9is provided with a heating cavity92above the combustion device and a grilling net96located above the heating cavity92, and a heat flow outlet119of the combustion device is in communication with the heating cavity92.

Therefore, an air flow from the heat flow outlet119of the combustion device is introduced into the heating cavity92to maintain the heating cavity92in a high temperature state, an upper end surface of the heating cavity92diffuses heat upward to grill the food on the grilling net96, and the upper end surface of the heating cavity92diffuses heat in the form of a surface area, so that the grilling net96is fully covered to grill the food uniformly.