Circulating gas-fired hot blast stove

Abstract

The utility model provides a kind of circulating gas hot air furnace, comprising: combustor, it is set to produce hot air by burning gas;First mixing chamber, with hot air inlet, hot air outlet and circulating air inlet, the hot air generated by combustor enters first mixing chamber through hot air inlet;Drying chamber, it is respectively communicated to hot air outlet and circulating air inlet, to allow the air flow that enters drying chamber by hot air outlet returns first mixing chamber by circulating air inlet;And fan, fan is set to be able to drive the air flow in first mixing chamber to hot air outlet flow.By fan in first mixing chamber form by circulating air inlet air flow to hot air outlet, hot air produced by traction combustor enters drying chamber and material is dried, while driving old hot air in drying chamber by circulating air inlet returns first mixing chamber and hot air is mixed after reentering drying chamber, effectively improve the heat recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gas-fired hot air furnace technology, and in particular to a circulating gas-fired hot air furnace. Background Technology

[0002] Gas-fired hot air furnaces are devices that use hot air generated by the combustion of natural gas to directly heat, dry, or bake materials. Compared to other indirect heating methods, they can save about half the fuel and are more efficient. At the same time, natural gas is a clean energy source, producing virtually no pollutants during combustion, making it environmentally friendly and highly favored.

[0003] Existing gas-fired hot air furnaces include a burner, a mixing chamber, and a drying chamber. The hot air generated by the burner is mixed with the cold air entering the mixing chamber before entering the drying chamber to dry the materials. However, the hot air in the drying chamber is directly discharged into the atmosphere after use, and there is a lack of effective recovery methods, which results in a large amount of heat loss. Utility Model Content

[0004] One of the technical problems that this utility model aims to solve is: how to effectively recover the hot air from a gas-fired hot air furnace to reduce heat loss and improve energy utilization.

[0005] To solve the above-mentioned technical problems, this utility model provides a circulating gas hot air furnace, comprising: a burner configured to generate hot air by burning gas; a first mixing chamber having a hot air inlet, a hot air outlet, and a circulating air inlet, wherein the hot air generated by the burner enters the first mixing chamber through the hot air inlet; a drying chamber connected to the hot air outlet and the circulating air inlet respectively, so as to allow the airflow entering the drying chamber through the hot air outlet to return to the first mixing chamber through the circulating air inlet; and a fan configured to drive the airflow in the first mixing chamber to flow toward the hot air outlet.

[0006] In some embodiments, a first filter screen is provided at the hot air inlet.

[0007] In some embodiments, a combustion chamber connected to a hot air inlet is also included, the burner is installed in the combustion chamber, and the combustion chamber has a cold air inlet.

[0008] In some embodiments, the combustion chamber is provided with a combustion tube, and the burner nozzle extends into the interior of the combustion tube.

[0009] In some embodiments, a second filter screen is provided at the cold air inlet.

[0010] In some embodiments, a second mixing chamber is provided between the combustion chamber and the hot air inlet, where the hot air generated by the combustion gas of the burner and the residual cold air entering from the cold air inlet and passing through the combustion chamber are initially mixed.

[0011] In some embodiments, the combustion chamber and the first mixing chamber are fitted together.

[0012] In some embodiments, at least a portion of the walls of the first mixing chamber are formed by detachable panels.

[0013] In some embodiments, a temperature sensor and / or an air guide plate are provided at the hot air outlet.

[0014] In some embodiments, the fan is installed inside the first mixing chamber and located downstream of the hot air outlet.

[0015] Through the above technical solution, the circulating gas hot air furnace provided by this utility model forms an airflow from the circulating air inlet to the hot air outlet in the first mixing chamber through a blower. On the one hand, it drives the hot air generated by the burner to enter the drying chamber from the hot air outlet to dry the material. On the other hand, it draws the old hot air in the drying chamber back from the circulating air inlet to the first mixing chamber to mix with the hot air and then re-enter the drying chamber. This effectively improves the heat recovery efficiency, reduces energy consumption, and ensures the operational reliability of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view schematic diagram of the circulating gas hot air furnace of this utility model after omitting the drying chamber;

[0018] Figure 2 This is a left-side view of the circulating gas-fired hot air furnace of this utility model;

[0019] Figure 3 This is a front view schematic diagram of the circulating gas hot air furnace of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the circulating gas hot air furnace of this utility model. Figure 1 ;

[0021] Figure 5 This is a schematic diagram of the structure of the circulating gas hot air furnace of this utility model. Figure 2 .

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Burner; 2. First mixing chamber; 201. Hot air inlet; 202. Hot air outlet; 203. Circulating air inlet; 3. Drying chamber; 4. Fan; 5. First filter screen; 6. Combustion chamber; 601. Cold air inlet; 602. Combustion cylinder; 7. Second filter screen; 8. Second mixing chamber. Detailed Implementation

[0024] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principles of this utility model, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments described herein, but includes all technical solutions falling within the scope of the claims.

[0025] These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0026] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0028] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0029] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0031] like Figure 1-3 As shown, this utility model provides a circulating gas hot air furnace, comprising: a burner 1, configured to generate hot air by burning gas; a first mixing chamber 2, having a hot air inlet 201, a hot air outlet 202, and a circulating air inlet 203, wherein the hot air generated by the burner 1 enters the first mixing chamber 2 through the hot air inlet 201; a drying chamber 3, connected to the hot air outlet 202 and the circulating air inlet 203 respectively, so as to allow the airflow entering the drying chamber 3 through the hot air outlet 202 to return to the first mixing chamber 2 through the circulating air inlet 203; and a fan 4, configured to drive the airflow in the first mixing chamber 2 to flow toward the hot air outlet 202.

[0032] Specifically, the hot air generated by the combustion of gas in burner 1 enters the first mixing chamber 2 through hot air inlet 201 and mixes with the airflow in the first mixing chamber 2 to form a drying airflow. The drying airflow, drawn by fan 4, enters the drying chamber 3 through hot air outlet 202 to dry the material in the drying chamber 3. Simultaneously, the blower 4 creates a negative pressure in the first mixing chamber 2 by blowing the drying airflow into the drying chamber 3. Under this negative pressure, the residual heat from the old airflow in the drying chamber 3 is drawn into the first mixing chamber 2 through circulating air inlet 203 for remixing, thus recovering the residual heat of the old airflow and reducing the amount of gas consumed by burner 1, effectively improving energy utilization. Here, burner 1 is a common gas burner capable of burning gas to generate hot air. Figure 3For example, the hot air outlet 202 is connected to the lower end of the drying chamber 3, and the circulating air inlet 203 is connected to the upper end of the drying chamber 3. The fan 4 forms an airflow from the circulating air inlet 203 to the hot air outlet 202 in the first mixing chamber 2. The drying airflow enters from the lower end of the drying chamber 3 and flows upward to dry the material. The old airflow with residual heat is returned to the first mixing chamber 2 for mixing and reuse under the traction of the fan 4. In other embodiments, the positions of the hot air outlet 202 and the circulating air inlet 203 can also be adjusted, and this utility model does not impose any limitations.

[0033] like Figure 1 As shown, in some embodiments, a first filter screen 5 is provided at the hot air inlet 201.

[0034] Specifically, the residual heat of the old airflow can easily carry the debris of the dried material into the first mixing chamber 2 when it returns. To prevent the debris in the first mixing chamber 2 from spreading to the vicinity of the burner 1 through the hot air inlet 201 and causing deflagration, a first filter screen 5 is installed at the hot air inlet 201 to block the debris. The debris is driven by the fan 4 to return to the drying chamber 3 or accumulate on the bottom surface of the first mixing chamber 2 for centralized cleaning, which effectively improves the safety of the device operation and reduces the maintenance difficulty of the gas-fired hot air furnace.

[0035] like Figure 2 As shown, in some embodiments, a combustion chamber 6 connected to the hot air inlet 201 is also included, the burner 1 is installed in the combustion chamber 6, and the combustion chamber 6 has a cold air inlet 601.

[0036] Specifically, burner 1 is installed on the side wall of combustion chamber 6, with its main body located outside the combustion chamber 6. The nozzle of burner 1 extends through its side wall into the interior of combustion chamber 6. Cold air entering combustion chamber 6 through cold air inlet 601 provides oxygen to the combustion flame at burner 1's nozzle, aiding combustion and preventing incomplete combustion. Simultaneously, the cold air can undergo preliminary mixing with the hot air generated by combustion to lower the temperature of the drying airflow, facilitating baking. Burner 1 and cold air inlet 601 are respectively located on two opposite side walls of combustion chamber 6, forming convection to enhance combustion aid and preliminary mixing. Here, cold air refers to the external airflow of the circulating gas-fired hot air furnace, whose external temperature is lower than the hot air generated by burner 1; it does not specify a cooling airflow requiring special cooling.

[0037] like Figure 1 and Figure 2 As shown, in some embodiments, a combustion chamber 6 is provided with a combustion cylinder 602, and the nozzle of the burner 1 extends into the interior of the combustion cylinder 602.

[0038] Specifically, the combustion chamber 602 is used to constrain the flame shape at the nozzle, preventing the flame from directly invading the sidewall of the combustion chamber 6 and affecting the equipment's lifespan, while also preventing the flame from drifting and contacting debris in the first mixing chamber 2, thus preventing deflagration. Combined with... Figure 2 The airflow direction indicated by the middle arrow shows that the two ends of the combustion cylinder 602 are connected to the cold air inlet 601 and the burner 1, respectively, guiding the cold air to contact the combustion flame for full combustion and simultaneously guiding it to flow towards the hot air inlet 201 for smooth drying. The combustion cylinder 602 can be made of high-temperature resistant materials such as stainless steel or ceramic composite plate. At the same time, the cold air entering the combustion chamber 6 from the cold air inlet 601 can also have a certain cooling effect on the combustion cylinder 602 to prevent overheating.

[0039] like Figure 2 As shown, in some embodiments, a second filter plate 7 is provided at the cold air inlet 601 to prevent external impurities from entering the combustion chamber 6 through the cold air inlet 601 and causing flame deflagration at the nozzle of the burner 1. The first filter plate 5 and the second filter plate 7 work together to effectively prevent impurities outside the combustion chamber 6 from approaching the nozzle of the burner 1, ensuring the stability of the gas combustion process.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, a second mixing chamber 8 is provided between the combustion chamber 6 and the hot air inlet 201, and the hot air generated by the combustion gas of the burner 1 and the residual cold air entering from the cold air inlet 601 and passing through the combustion chamber 6 are initially mixed in the second mixing chamber 8.

[0041] Specifically, with Figure 1 For example, the second mixing chamber 8 is located at the top of the combustion chamber 6. The nozzle of the burner 1 extends into the combustion cylinder 602. The nozzle flame, aided by the cold air, fully combusts to generate hot air. The hot air flows upward into the second mixing chamber 8 and mixes with the remaining cold air within the second mixing chamber 8. The mixed airflow then enters the first mixing chamber 8 through the hot air inlet 201 located on one side of the second mixing chamber 8, and mixes with the airflow inside the first mixing chamber 8 to finally form a drying airflow. The hot air generated by the burner 1 is mixed successively in the second mixing chamber 8 and the first mixing chamber 2, which helps to form a drying airflow with a uniform temperature distribution, ensuring the drying effect on the material. In other embodiments, the position of the second mixing chamber 8 can also be adjusted, and this utility model does not impose any limitations.

[0042] like Figure 1 and Figure 3 As shown, in some embodiments, the combustion chamber 6 and the first mixing chamber 2 are fitted together.

[0043] Specifically, with Figure 1For example, a partition is installed inside the circulating gas-fired hot air furnace to separate the internal space of the furnace, forming an adjacent combustion chamber 6 and a first mixing chamber 2. The second mixing chamber 8 is a space located above the combustion chamber 6 within the hot air furnace for the initial mixing of hot air and cold air. This partition, serving as a common sidewall for the combustion chamber 6 and the first mixing chamber 2, facilitates the transfer of excess heat from the combustion chamber 6 to the first mixing chamber 8, fully utilizing the heat generated by gas combustion and reducing gas consumption.

[0044] In some embodiments, at least a portion of the walls of the first mixing chamber 2 are formed by detachable panels.

[0045] Specifically, to facilitate equipment maintenance, the first mixing chamber 2 includes support columns forming its spatial frame. At least a portion of its walls are assembled from multiple detachable plates mounted on the support columns to facilitate maintenance or cleaning of the fan 4, the first filter screen 5, and debris accumulated on the bottom surface of the second mixing chamber 2. The plates and support columns can be bolted together, and high-temperature resistant sealing strips can be installed at the junctions of the plates to ensure a tight seal.

[0046] In some embodiments, a temperature sensor and / or a guide vane are provided at the hot air outlet 202. Specifically, the temperature sensor can monitor the temperature of the drying airflow entering the drying chamber 3, and adjust the power of the burner 1 appropriately based on the temperature monitoring results to form a stable drying airflow, avoiding excessively high temperatures that lead to fuel waste or excessively low temperatures that result in poor drying effects. The guide vane can be used to specifically guide the flow of the drying airflow according to the stacking of materials in the drying chamber 3, so as to make full use of the drying airflow and improve drying efficiency.

[0047] like Figure 1 and Figure 3 As shown, in some embodiments, the fan 4 is installed inside the first mixing chamber 2 and located downstream of the hot air inlet 201.

[0048] Specifically, installing the fan 4 downstream of the hot air inlet 201 effectively prevents debris from entering the hot air inlet 201. Figure 3 Taking the airflow direction indicated by the middle arrow as an example, the blower 4, as the induced draft component in the circulating gas hot air furnace, draws outside cold air from the cold air inlet 601 into the combustion chamber 6 to assist the combustion of the nozzle flame. The hot air generated by combustion and the remaining cold air are drawn upward by the blower 4 to the second mixing chamber 8 for preliminary mixing, and then enter the first mixing chamber 2 through the hot air inlet 201. At the same time, the blower 4 draws the old airflow with residual heat from the circulating air inlet 203 into the first mixing chamber 2. The two airflows mix to form a drying airflow, and under the drive of the blower 4, enter the drying chamber 3 through the hot air outlet 202 to dry the material.

[0049] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions described herein based on the above description.

[0050] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A circulating gas-fired hot air furnace, characterized in that, include: Burner (1), the burner (1) is configured to generate hot air by burning gas; The first mixing chamber (2) has a hot air inlet (201), a hot air outlet (202) and a circulating air inlet (203), and the hot air generated by the burner (1) enters the first mixing chamber (2) through the hot air inlet (201); A drying chamber (3) is connected to the hot air outlet (202) and the circulating air inlet (203) respectively, so as to allow the airflow entering the drying chamber (3) through the hot air outlet (202) to return to the first mixing chamber (2) through the circulating air inlet (203); and A fan (4) is configured to drive the airflow in the first mixing chamber (2) toward the hot air outlet (202).

2. The circulating gas-fired hot air furnace according to claim 1, characterized in that, A first filter screen (5) is provided at the hot air inlet (201).

3. The circulating gas-fired hot air furnace according to claim 1, characterized in that, It also includes a combustion chamber (6) connected to the hot air inlet (201), the burner (1) is installed in the combustion chamber (6), and the combustion chamber (6) has a cold air inlet (601).

4. The circulating gas-fired hot air furnace according to claim 3, characterized in that, The combustion chamber (6) is provided with a combustion cylinder (602), and the nozzle of the burner (1) extends into the interior of the combustion cylinder (602).

5. The circulating gas-fired hot air furnace according to claim 3, characterized in that, A second filter screen (7) is provided at the cold air inlet (601).

6. The circulating gas-fired hot air furnace according to claim 3, characterized in that, A second mixing chamber (8) is provided between the combustion chamber (6) and the hot air inlet (201), where the hot air generated by the combustion gas of the burner (1) and the remaining cold air entering from the cold air inlet (601) and passing through the combustion chamber (6) are initially mixed in the second mixing chamber (8).

7. The circulating gas-fired hot air furnace according to claim 3, characterized in that, The combustion chamber (6) and the first mixing chamber (2) are fitted together.

8. The circulating gas-fired hot air furnace according to claim 1, characterized in that, At least a portion of the walls of the first mixing chamber (2) are formed by detachable panels.

9. The circulating gas-fired hot air furnace according to claim 1, characterized in that, A temperature sensor and / or air guide plate are provided at the hot air outlet (202).

10. The circulating gas-fired hot air furnace according to claim 1, characterized in that, The fan (4) is installed inside the first mixing chamber (2) and is located downstream of the hot air inlet (201).

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