Gas roasting furnace

Abstract

The utility model discloses a gas roasting furnace, which relates to the technical field of gas roasting furnaces and comprises a base, a roasting furnace body is fixedly mounted on the upper surface of the base, a sealing door is rotatably connected to the front side of the roasting furnace body through hinges, and two cushion blocks are fixedly connected to the inner bottom surface of the roasting furnace body. And sliding guide rails are fixedly connected to the upper portions of the two cushion blocks correspondingly, a tray is slidably connected to the upper portions of the two sliding guide rails through sliding blocks, a mounting frame is fixedly connected to the rear side of the roasting furnace body through bolts, and a gas mixing assembly is fixedly mounted above the mounting frame. The gas mixing assembly has the advantages that the triangular guide block changes the flowing direction of gas through the triangular guide block and the spoilers arranged in the staggered mode, so that fuel gas and air are mixed preliminarily and spread towards the two sides, the spoilers disrupt the flowing path of the gas, the fuel gas and the air are further mixed sufficiently, and uniform mixed gas is formed; combustion efficiency is improved, and energy waste is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas-fired roasting furnace technology, specifically to a gas-fired roasting furnace. Background Technology

[0002] Calcination is a physical and chemical change process that occurs when solid materials are heated at high temperatures without melting, altering their chemical properties and physical composition to facilitate further processing. Heating sand molds in a calcination furnace removes moisture, improving their permeability. Furthermore, calcination increases the strength of the sand mold, making the cast parts less prone to deformation.

[0003] For example, Chinese Patent (CN212227714U) discloses a gas-fired roasting furnace for precision casting, including a base with a first furnace door slidably connected to it. The first and second furnace doors are interconnected to form a closed furnace cavity sidewall, and sealing blocks are provided at the connection points of the first and second furnace doors. The upper surface of the base has multiple first natural gas injection holes, and a connecting pipe is located at the center of the upper part of the base. Multiple second natural gas injection holes are provided on the sidewall of the connecting pipe. The tops of the first and second furnace doors are connected to a furnace roof, and the inner surface of the furnace roof has multiple air injection holes. This roasting furnace breaks away from the traditional rectangular roasting furnace arrangement, injecting natural gas from the bottom into the furnace to ensure uniform heating of the workpiece. The furnace doors are designed for track-operated opening and closing, ensuring both airtightness and ease of opening and closing.

[0004] The aforementioned device directly injects gas and air into the combustion zone for combustion. However, the gas and air may not mix sufficiently, and some gas may not burn completely due to insufficient oxygen supply. Incomplete combustion not only wastes energy but may also increase fuel consumption in the furnace and reduce combustion efficiency. Incomplete mixing of gas and air may lead to instability in the combustion process, affecting the safety and stability of the furnace, and may even cause equipment failure or safety accidents. In addition, areas with insufficient oxygen will also lead to the generation of carbon monoxide (CO), increasing emissions and reducing environmental impact. To address the above problems, a gas-fired roasting furnace is proposed to solve them. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a gas-fired roasting furnace. This solves the problem that current methods, which directly inject gas and air into the combustion zone, may result in insufficient mixing of the gas and air, and some gas may not burn completely due to insufficient oxygen supply. Incomplete combustion not only wastes energy but may also increase fuel consumption within the furnace, reducing combustion efficiency. Insufficient mixing of gas and air can lead to unstable combustion processes, affecting the safety and stability of the furnace, and potentially causing equipment malfunctions or safety accidents. Furthermore, areas with insufficient oxygen can lead to the generation of carbon monoxide (CO), increasing emissions and reducing environmental impact.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a gas-fired roasting furnace, including a base, a roasting furnace body fixedly installed on the upper surface of the base, a sealing door rotatably connected to the front side of the roasting furnace body via a hinge, two pads fixedly connected to the bottom surface inside the roasting furnace body, a sliding guide rail fixedly connected above each of the two pads, a tray slidably connected above the two sliding guide rails via a sliding block, and a mounting frame fixedly connected to the rear side of the roasting furnace body via bolts, with a gas mixing component fixedly installed above the mounting frame.

[0007] Preferably, an exhaust pipe is fixedly installed on the upper right side of the roasting furnace body, and a handle for opening and closing and a locking structure for fixing to the mixing box are fixedly installed on the front side of the sealing door.

[0008] Preferably, the air mixing assembly includes an air mixing box, which is fixedly connected to the upper surface of the mounting frame, and an air inlet pipe is fixedly connected to the center of the top surface of the air mixing box.

[0009] Preferably, a T-connector is fixedly installed above the air intake pipe, a gas inlet pipe is fixedly connected to the left side of the T-connector, and an air inlet pipe is fixedly connected to the right side of the T-connector.

[0010] Preferably, a triangular guide block is fixedly connected to the bottom surface of the mixing chamber at the middle position, and several turbulence plates are fixedly connected to the left and right sides of the mixing chamber, with the turbulence plates arranged in a staggered manner.

[0011] Preferably, both sides of the mixing chamber are fixedly connected to an exhaust pipe, and the ends of both exhaust pipes are fixedly connected to a Venturi tube.

[0012] Preferably, the ends of the two Venturi tubes away from the gas outlet are fixedly connected to a connecting pipe, and the ends of the two connecting pipes are fixedly connected to a dispersion pipe. A plurality of combustion nozzles are fixedly connected to the side of the two dispersion pipes near the roasting furnace body, and the combustion nozzles are disposed inside the roasting furnace body.

[0013] Compared with the prior art, the advantages of this utility model are as follows: The gas mixing component in this utility model uses triangular guide blocks and staggered baffles. The triangular guide blocks change the flow direction of the gas, allowing the gas and air to initially mix and diffuse to both sides. The baffles disrupt the flow path of the gas, promoting further and more thorough mixing of the gas and air to form a uniform gas mixture. The Venturi tube further enhances the mixing effect, allowing the gas and air to enter the combustion nozzle in a more uniform state, improving combustion efficiency, reducing energy waste, and ensuring a stable gas-air mixture state. This avoids combustion instability caused by insufficient mixing, reduces the probability of equipment failure and safety accidents, ensures the safety of the roasting furnace operation, and reduces the generation of harmful gases such as carbon monoxide, thus reducing emissions, meeting environmental protection requirements, and reducing environmental pollution. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a structural schematic diagram of the present invention from another perspective;

[0016] Figure 3 This is a schematic diagram of the sealed door in the open state of this utility model;

[0017] Figure 4 This is a schematic diagram of the gas mixing component structure in this utility model;

[0018] Figure 5 This is a schematic diagram of the internal structure of the mixing chamber in this utility model.

[0019] The numbers on the map are:

[0020] 1. Base; 2. Roasting furnace body; 3. Sealing door; 4. Pad; 5. Sliding guide rail; 6. Tray; 7. Exhaust gas pipe; 8. Mounting bracket; 9. Mixing assembly; 901. Mixing box; 902. Inlet pipe; 903. T-joint; 904. Gas inlet pipe; 905. Air inlet pipe; 906. Triangular guide block; 907. Baffle plate; 908. Exhaust pipe; 909. Venturi tube; 910. Connecting pipe; 911. Dispersion pipe; 912. Combustion nozzle. Detailed Implementation

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0022] Reference Figure 1-5As shown, a gas-fired roasting furnace includes a base 1. A roasting furnace body 2 is fixedly installed on the upper surface of the base 1. A sealing door 3 is rotatably connected to the front of the roasting furnace body 2 via a hinge. Two pads 4 are fixedly connected to the bottom surface inside the roasting furnace body 2. Sliding guide rails 5 are fixedly connected above each of the two pads 4. A tray 6 is slidably connected above the two sliding guide rails 5 via sliding blocks. A mounting bracket 8 is fixedly connected to the rear of the roasting furnace body 2 via bolts. A gas mixing component 9 is fixedly installed above the mounting bracket 8. The base 1 integrates a display screen and operation buttons. An igniter (not shown in the figure) is also installed inside the roasting furnace body 2. Ignition can be controlled by the operation buttons. This is common knowledge that can be understood by those skilled in the art and will not be elaborated further here.

[0023] Reference Figure 1 and Figure 2 As shown, an exhaust pipe 7 is fixedly installed on the upper right side of the roasting furnace body 2. An umbrella-shaped baffle is provided at the outlet of the exhaust pipe 7 to prevent backflow of external airflow from causing flameout or deflagration. A handle for opening and closing and a locking structure for fixing with the mixing box 901 are fixedly installed on the front side of the sealing door 3. The locking structure achieves a rigid connection between the sealing door 3 and the roasting furnace body 2 through mechanical pressing. With the help of a high-temperature resistant sealing strip, it can ensure stable internal pressure of the roasting furnace body 2, reduce heat loss, and reduce energy consumption.

[0024] Reference Figure 4 and Figure 5 As shown, the air mixing assembly 9 includes an air mixing box 901, which is fixedly connected to the upper surface of the mounting bracket 8, and an air inlet pipe 902 is fixedly connected to the middle of the top surface of the air mixing box 901.

[0025] Reference Figure 4 and Figure 5 As shown, a three-way connector 903 is fixedly installed above the intake pipe 902. A gas inlet pipe 904 is fixedly connected to the left side of the three-way connector 903, and an air inlet pipe 905 is fixedly connected to the right side of the three-way connector 903. The gas and air are mixed for the first time in the three-way connector 903, and the gas kinetic energy is used to achieve preliminary homogenization, reducing the load of the subsequent mixing section.

[0026] Reference Figure 5 As shown, a triangular guide block 906 is fixedly connected to the bottom surface of the mixing chamber 901 at the middle position. Several turbulence plates 907 are fixedly connected to the left and right sides of the mixing chamber 901. The turbulence plates 907 are arranged in a staggered manner. The staggered arrangement can make the gas flow in an "S" shape inside the mixing chamber 901. The edges of the turbulence plates 907 are rounded to reduce airflow impact noise.

[0027] Reference Figure 4As shown, both sides of the mixing chamber 901 are fixedly connected to an exhaust pipe 908, and the ends of the two exhaust pipes 908 are fixedly connected to a Venturi tube 909. The Venturi tube 909 has a high flow velocity at its throat and generates negative pressure by utilizing the Venturi effect to further adsorb the surrounding gas and enhance the mixing effect.

[0028] Reference Figure 4 As shown, the ends of the two Venturi tubes 909 away from the gas outlet pipe 908 are fixedly connected to connecting pipes 910. The ends of the two connecting pipes 910 are fixedly connected to dispersing pipes 911. Several combustion nozzles 912 are fixedly connected to the side of the two dispersing pipes 911 near the roasting furnace body 2. The combustion nozzles 912 are set inside the roasting furnace body 2 and are arranged in a matrix. The spacing of the combustion nozzles 912 matches the size of the roasting material. The temperature difference in the furnace can be controlled within ±5℃. The combustion nozzles 912 are made of porous ceramic material and the flame length is adjustable to adapt to different material roasting curves and reduce ineffective heat loss.

[0029] Working principle: By pulling open the sealing door 3 with the handle, the material to be roasted can be placed on the sliding guide rail 5 using the sliding characteristics of the tray 6. After placing the material, close the sealing door 3 and use the locking structure to fix the sealing door 3 to the mixing box 901, ensuring the airtightness of the roasting furnace body 2. The gas enters the three-way connector 903 through the gas inlet pipe 904, and the air also enters the three-way connector 903 through the air inlet pipe 905. After the two initially merge at the three-way connector 903, they enter the air inlet pipe 902 together and then flow into the mixing box 901. After entering the mixing box 901, the gas and air first encounter the triangular guide block 906. The triangular guide block 906 changes the flow direction of the gas, causing the gas and air to initially mix and diffuse to both sides. Then, during the flow, the gas continuously collides with the staggered baffles 907 on the left and right sides. The baffles 907 disrupt the flow path of the gas, promoting further and more thorough mixing of the gas and air to form a uniform mixture. The fully mixed gas flows out from the gas outlet pipes 908 on both sides of the mixing box 901 and enters the venturi tube 909. The venturi tube 909, with its special structure, accelerates the speed of the mixed gas as it passes through, further enhancing the mixing effect and generating a certain suction force to ensure smooth delivery of the mixed gas. After flowing out of the venturi tube 909, the mixed gas enters the dispersion pipe 911 through the connecting pipe 910. The dispersion pipe 911 evenly distributes the mixed gas to each combustion nozzle 912. The combustion nozzles 912 spray the mixed gas into the roasting furnace body 2 for combustion. The heat generated by combustion roasts the material placed on the tray 6. During the roasting process, the generated exhaust gas is discharged from the roasting furnace body 2 through the exhaust pipe 7. After roasting is completed, the valves of the gas inlet pipe 904 and the air inlet pipe 905 are closed to stop the gas supply. After the roasting furnace body 2 cools down, the sealing door 3 is opened, and the roasted material is taken out by sliding the tray 6 on the sliding guide rail 5.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gas-fired roasting furnace, characterized in that: The furnace includes a base (1), on which a roasting furnace body (2) is fixedly mounted. A sealing door (3) is rotatably connected to the front side of the roasting furnace body (2) via a hinge. Two pads (4) are fixedly connected to the bottom inside the roasting furnace body (2). Sliding guide rails (5) are fixedly connected above the two pads (4). A tray (6) is slidably connected above the two sliding guide rails (5) via sliding blocks. An installation frame (8) is fixedly connected to the rear side of the roasting furnace body (2) via bolts. A gas mixing component (9) is fixedly mounted above the installation frame (8).

2. The gas-fired roasting furnace according to claim 1, characterized in that: The exhaust pipe (7) is fixedly installed on the upper right side of the roasting furnace body (2), and the front side of the sealing door (3) is fixedly installed with a handle for opening and closing and a locking structure for fixing with the mixing box (901).

3. A gas-fired roasting furnace according to any one of claims 1-2, characterized in that: The mixing assembly (9) includes a mixing box (901), which is fixedly connected to the upper surface of the mounting bracket (8), and an air inlet pipe (902) is fixedly connected to the middle of the top surface of the mixing box (901).

4. A gas-fired roasting furnace according to claim 3, characterized in that: A three-way connector (903) is fixedly installed above the air intake pipe (902). A gas inlet pipe (904) is fixedly connected to the left side of the three-way connector (903), and an air inlet pipe (905) is fixedly connected to the right side of the three-way connector (903).

5. A gas-fired roasting furnace according to claim 3, characterized in that: A triangular guide block (906) is fixedly connected to the bottom surface of the mixing box (901) at the middle position. Several turbulence plates (907) are fixedly connected to the left and right sides of the mixing box (901), and the several turbulence plates (907) are arranged in a staggered manner.

6. A gas-fired roasting furnace according to claim 3, characterized in that: The mixing chamber (901) is fixedly connected to both sides of the air outlet pipe (908), and the ends of the two air outlet pipes (908) are fixedly connected to the Venturi tubes (909).

7. A gas-fired roasting furnace according to claim 6, characterized in that: Two Venturi tubes (909) are fixedly connected to a connecting pipe (910) at one end away from the gas outlet pipe (908). Both connecting pipes (910) are fixedly connected to a dispersing pipe (911) at the end. Several combustion nozzles (912) are fixedly connected to the side of the two dispersing pipes (911) near the roasting furnace body (2). The combustion nozzles (912) are located inside the roasting furnace body (2).

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