Multi-mixing heating and baking tunnel furnace

Abstract

The utility model discloses a multiple mixing heating baking tunnel furnace which comprises a tunnel furnace body, a radiation circulation system and a convection circulation system are arranged on the tunnel furnace body, and the radiation circulation system comprises a first heat preservation outer cover, a combustion engine, a mixing barrel, a radiation circulation fan, a mixing box, an air inlet box, a radiation pipe, an air return pipeline and a combustion discharge pipe. The tunnel furnace body, the radiation circulating system and the convection circulating system are arranged, two independent circulating systems are adopted, heat generated by the combustor can be fully combusted in the mixing barrel and then injected into the radiation pipe to fully heat materials, the radiation circulating fan sucks hot air in the radiation pipe, then the hot air is injected into the mixing barrel, and the materials are fully heated. The convection circulation fan circularly extracts and discharges the heat dissipated in the tunnel furnace body, the heat is reused, the utilization rate of the heat is further improved, and the uniformity degree of material heating is further improved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel oven technology, specifically a multi-stage mixed heating and baking tunnel oven. Background Technology

[0002] A tunnel oven is a type of mechanical equipment that bakes food through heat conduction, convection, and radiation. Its oven body is generally long, with a continuously operating conveyor system inside the tunnel. During processing, the material moves relative to the heating elements or direct-fired burners via conveyor chains, steel belts, or mesh belts, thus achieving uniform baking and conveying.

[0003] Existing heating and baking tunnel ovens generally use direct heating of gas followed by hot gas delivery. The heating system and delivery system are combined, which can easily lead to uneven heating and low heat utilization during the grilling process. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage mixing heating and baking tunnel oven, which employs two independent circulation systems. The heat generated by the burner is fully combusted in the mixing cylinder and then injected into the radiant tube to fully heat the material. The radiant circulation fan draws in the hot air from the radiant tube and injects it into the mixing cylinder, improving the heat utilization rate. The convection circulation fan circulates and extracts the heat dissipated from the tunnel oven, allowing the heat to be reused, further improving the heat utilization rate and the uniformity of material heating.

[0005] To achieve the above objectives, a multi-stage mixing heating and baking tunnel oven is provided, comprising: a tunnel oven body, wherein the tunnel oven body is equipped with a radiant circulation system and a convection circulation system; the radiant circulation system includes a first insulating outer cover, a burner, a mixing cylinder, a radiant circulation fan, a mixing box, an air inlet box, a radiant tube, a return air duct, and a combustion exhaust pipe; the burner and the radiant circulation fan are fixedly connected to the front side wall of the first insulating outer cover; the mixing cylinder is fixedly connected to the inside of the first insulating outer cover; the mixing box is fixedly connected to the rear side wall of the mixing cylinder; the air inlet box is fixedly connected to the bottom of the mixing box; the radiant tube is fixedly connected to the front side wall of the air inlet box; and the return air duct is fixedly connected to the front side wall of the radiant tube. The return air duct is fixedly connected at the end away from the radiant tube to the air inlet of the radiant circulating fan. A combustion exhaust pipe is fixedly connected to the top of the mixing box. The convection circulation system includes a second insulation cover, a convection circulating fan, a convection conveying duct, a convection air supply box, air holes, an air suction pipe, and a convection exhaust pipe. A convection circulating fan is fixedly connected to the top of the second insulation cover. A convection conveying duct is fixedly connected to the rear side wall of the convection circulating fan. A convection air supply box is fixedly connected to the front side wall of the convection conveying duct. The convection air supply box is provided with multiple air holes. An air suction pipe is fixedly connected to the bottom of the convection circulating fan. A convection exhaust pipe is fixedly connected to the top of the convection conveying duct.

[0006] According to the aforementioned multi-mixed heating and baking tunnel oven, the number of radiant tubes is set to multiple, and they are evenly distributed vertically along the length of the tunnel oven body.

[0007] According to the aforementioned multi-mixed heating and baking tunnel oven, the radiant tube is made of heat-resistant steel pipe, and the radiant tube is connected to the air inlet box via a flange.

[0008] According to the multi-mixed heating and baking tunnel oven, there are two convection air boxes, which are arranged symmetrically at the top and bottom. Both convection air boxes are located on the upper and lower sides of the radiant tube, and the air holes face the radiant tube.

[0009] According to the aforementioned multi-mixing heating and baking tunnel oven, the mixing cylinder is divided into an outer cylinder and an inner cylinder, and the inner cylinder is fixedly connected to the burner.

[0010] According to the aforementioned multi-mixed heating and baking tunnel oven, the suction pipe is located above the convection air supply box.

[0011] According to the aforementioned multi-mixing heating and baking tunnel oven, the mixing cylinder, mixing box, air inlet box, radiant tube, return air duct, convection conveying air duct, convection air supply box, and suction pipe are all located inside the tunnel oven body.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting up a tunnel furnace body, a radiant circulation system and a convection circulation system, and adopting two independent circulation systems, the heat generated by the burner can be fully burned in the mixing drum and then injected into the radiant tube to fully heat the material. The radiant circulation fan draws in the hot air from the radiant tube and injects it into the mixing drum, thereby improving the heat utilization rate. The convection circulation fan circulates and extracts the heat that escapes from the tunnel furnace body, allowing the heat to be reused, further improving the heat utilization rate and the uniformity of material heating.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0015] Figure 1 This is a front view of the multi-mixed heating and baking tunnel oven of this utility model;

[0016] Figure 2 This is an exploded view of the multi-mixed heating and baking tunnel oven of this utility model;

[0017] Figure 3 This is a structural diagram of the radiation circulation system of the multi-mixed heating and baking tunnel oven of this utility model;

[0018] Figure 4 This is a side view of the radiant circulation system of the multi-mixed heating and baking tunnel oven of this utility model;

[0019] Figure 5 This is a structural diagram of the convection circulation system of the multi-mixed heating and baking tunnel oven of this utility model;

[0020] Figure 6 This is a side view of the convection circulation system of the multi-mixed heating and baking tunnel oven of this utility model.

[0021] In the diagram: 1. Tunnel furnace body; 2. Radiant circulation system; 3. Convection circulation system;

[0022] 201. First insulation cover; 202. Burner; 203. Mixing cylinder; 204. Radiant circulating fan; 205. Mixing box; 206. Air inlet box; 207. Radiant tube; 208. Return air duct; 209. Combustion exhaust pipe;

[0023] 301. Second insulation cover; 302. Convection circulation fan; 303. Convection conveying air duct; 304. Convection air supply box; 305. Air hole; 306. Suction pipe; 307. Convection discharge pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-6 This utility model provides a technical solution: a multi-stage mixing heating and baking tunnel oven, comprising: a tunnel oven body 1, on which a radiant circulation system 2 and a convection circulation system 3 are provided. The radiant circulation system 2 includes a first heat-insulating outer cover 201, a burner 202, a mixing cylinder 203, a radiant circulation fan 204, a mixing box 205, an air inlet box 206, a radiant tube 207, a return air duct 208, and a combustion exhaust pipe 209. The front side wall of the first heat-insulating outer cover 201... A burner 202 and a radiant circulating fan 204 are fixedly connected to the upper part of the first insulation cover 201. A mixing cylinder 203 is fixedly connected inside the first insulation cover 201. The mixing cylinder 203 is divided into an outer cylinder and an inner cylinder. The inner cylinder is fixedly connected to the burner 202. Under the action of the burner 202, the fuel is fully burned in the inner cylinder and then enters the mixing box 205. The mixing box 205 is fixedly connected to the rear side wall of the mixing cylinder 203. An air inlet box 206 is fixedly connected to the bottom of the mixing box 205. Radiation tubes 207 are fixedly connected to the front side wall of the furnace. Multiple radiation tubes 207 are arranged and evenly distributed along the length of the tunnel furnace body 1. The material conveying system is located between the upper and lower layers of radiation tubes 207. The radiation tubes 207 are made of heat-resistant steel pipes and are connected to the air inlet box 206 through flanges. A return air duct 208 is fixedly connected to the front side wall of the radiation tubes 207. The end of the return air duct 208 away from the radiation tubes 207 is fixedly connected to the air inlet end of the radiation circulating fan 204. A combustion exhaust pipe 209 is fixedly connected to the top of the mixing box 205. When the burner 202 and the radiation circulating fan 204 are working, the heat generated enters the air inlet box 206 from the mixing cylinder 203 and is injected into the radiation tubes 207. The radiation tubes 207 radiate heat to heat and bake the material passing through. Under the action of the return air duct 208, the waste heat gas is injected back into the radiation circulating fan 204 for the next cycle.

[0026] The convection circulation system 3 includes a second insulation cover 301, a convection circulation fan 302, a convection conveying duct 303, a convection air supply box 304, air vents 305, an air intake pipe 306, and a convection exhaust pipe 307. The convection circulation fan 302 is fixedly connected to the top of the second insulation cover 301. The convection conveying duct 303 is fixedly connected to the rear side wall of the convection circulation fan 302. The convection air supply box 304 is fixedly connected to the front side wall of the convection conveying duct 303. Multiple air vents 305 are provided on the convection air supply box 304. There are two convection air supply boxes 304, symmetrically arranged vertically. Both convection air supply boxes 304 are located on the upper and lower sides of the radiant tube 207, with the air vents 305 facing the radiant tube 207. A suction pipe 306 is fixedly connected to the bottom of the machine 302. The suction pipe 306 is located above the convection air supply box 304. A convection discharge pipe 307 is fixedly connected to the top of the convection conveying air duct 303. When the convection circulating fan 302 is started, the airflow generated by the convection circulating fan 302 enters the convection air supply box 304 along the convection conveying air duct 303 and is blown out from the air hole 305. It blows the surface of the radiant tube 207 below, blowing the heat radiated by the radiant tube 207 onto the material passing through, accelerating the uniform heating of the material. Then, under the action of the suction pipe 306, the hot air overflowing from the radiant tube 207 is sucked in and injected back into the convection circulating fan 302 for circulating heating, further improving the uniformity of heating and the utilization rate of heat.

[0027] The mixing cylinder 203, mixing box 205, air inlet box 206, radiant tube 207, return air duct 208, convection conveying air duct 303, convection air supply box 304, and suction pipe 306 are all located inside the tunnel furnace body 1.

[0028] Working principle: When heating materials, the burner 202 and the radiant circulating fan 204 are started. The heat generated enters the air inlet box 206 from the mixing cylinder 203 and is injected into the radiant tube 207. The radiant tube 207 radiates heat to heat and bake the materials passing through it. Under the action of the return air pipe 208, the residual heat gas is injected back into the radiant circulating fan 204 for the next cycle. At the same time, the convection circulating fan 302 is started. The airflow generated by the convection circulating fan 302 enters the interior of the convection air box 304 along the convection conveying air duct 303 and is blown out from the air hole 305, blowing on the surface of the radiant tube 207 below. The heat radiated by the radiant tube 207 is blown onto the materials passing through it, accelerating the uniform heating of the materials. Then, under the action of the suction pipe 306, the hot air overflowing from the radiant tube 207 is sucked in and injected back into the convection circulating fan 302 for circulating heating, further improving the uniformity of heating and the utilization rate of heat.

[0029] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A multi-stage mixed heating and baking tunnel oven, including: A tunnel furnace body, characterized in that it is equipped with a radiant circulation system and a convection circulation system. The radiant circulation system includes a first insulating outer cover, a burner, a mixing cylinder, a radiant circulation fan, a mixing box, an air inlet box, a radiant tube, a return air duct, and a combustion exhaust pipe. The burner and the radiant circulation fan are fixedly connected to the front wall of the first insulating outer cover. A mixing cylinder is fixedly connected inside the first insulating outer cover. A mixing box is fixedly connected to the rear wall of the mixing cylinder. An air inlet box is fixedly connected to the bottom of the mixing box. A radiant tube is fixedly connected to the front wall of the air inlet box. A return air duct is fixedly connected to the front wall of the radiant tube. The end furthest from the radiant tube is fixedly connected to the air inlet of the radiant circulating fan. A combustion exhaust pipe is fixedly connected to the top of the mixing box. The convection circulation system includes a second insulation cover, a convection circulating fan, a convection conveying duct, a convection air supply box, air holes, an air suction pipe, and a convection exhaust pipe. A convection circulating fan is fixedly connected to the top of the second insulation cover. A convection conveying duct is fixedly connected to the rear side wall of the convection circulating fan. A convection air supply box is fixedly connected to the front side wall of the convection conveying duct. Multiple air holes are provided on the convection air supply box. An air suction pipe is fixedly connected to the bottom of the convection circulating fan. A convection exhaust pipe is fixedly connected to the top of the convection conveying duct.

2. The multi-stage hybrid heating and baking tunnel oven as described in claim 1, characterized in that: The number of radiation tubes is set to multiple, and they are evenly distributed vertically along the length of the tunnel furnace body.

3. The multi-stage hybrid heating and baking tunnel oven as described in claim 1, characterized in that: The radiant tube is made of heat-resistant steel pipe, and the radiant tube is connected to the air inlet box via a flange.

4. The multi-stage hybrid heating and baking tunnel oven as described in claim 1, characterized in that: The convection air supply box is provided in two symmetrical arrangements, one above the other. Both convection air supply boxes are located on the upper and lower sides of the radiant tube, and the air vents face the radiant tube.

5. The multi-stage hybrid heating and baking tunnel oven as described in claim 1, characterized in that: The mixing cylinder is divided into an outer cylinder and an inner cylinder, and the inner cylinder is fixedly connected to the burner.

6. The multi-stage mixed heating and baking tunnel oven as described in claim 1, characterized in that: The air intake pipe is located above the convection air supply box.

7. The multi-stage mixed heating and baking tunnel oven as described in claim 1, characterized in that: The mixing cylinder, mixing box, air inlet box, radiant tube, return air duct, convection conveying air duct, convection air supply box, and suction pipe are all located inside the tunnel furnace body.

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