WO2020000232A1 - Tunnel oven - Google Patents

Abstract

A tunnel oven (100), comprising a housing (10), a heat source structure (30) and a baking structure (20), wherein the heat source structure (30) and the baking structure (20) are fixedly mounted on the housing (10); the baking structure (20) comprises two radiant panel assemblies (21), and the two radiant panel assemblies (21) enclose to form a baking channel (23); each radiant panel assembly (21) comprises a plurality of radiant panels which are fixedly connected to each other, and each radiant panel is provided with a plurality of heat exchange passages (213) which communicate with each other; the heat source structure (30) is in communication with the heat exchange passages (213); hot air produced by the heat source structure (30) flows into the heat exchange passages (213) so as to heat the baking passage (23) by means of heat exchange between the two radiant panel assemblies (21). In the present tunnel oven, radiant heating may be carried out between the two radiant panel assemblies (21), and a steel strip support bracket (22) may conduct heat, which saves more energy, increases the energy utilization rate and has better temperature stability compared to a heat convection heating mode.

Description

Tunnel furnace Technical field

The invention relates to a heating device, in particular to a tunnel furnace.

Background technique

There are three basic forms of heat utilization, heat conduction, heat convection, and heat radiation. Since the food baking process is accompanied by a drainage function, from the perspective of heat utilization, convection heating is not suitable for repeated use of heat. And heat conduction heating has some specialities in the baking industry, and pure heat conduction has certain limitations. Therefore, the current tunnel furnace is a mixture of heat convection and heat conduction to complete food baking. However, this tunnel furnace using thermal convection has low energy utilization and low temperature stability.

Summary of the invention

In order to overcome the shortcomings of the prior art, an object of the present invention is to provide a tunnel furnace with high energy efficiency and good temperature stability.

The objective of the present invention is achieved by the following technical solutions:

A tunnel furnace includes a shell, a heat source structure, and a baking structure. The heat source structure and the baking structure are fixedly installed on the shell. The baking structure includes two radiating plate assemblies and two radiating plates. The components surround a baking channel. Each of the radiating plate components includes a plurality of radiating plates. The plurality of radiating plates are fixedly connected to each other. Each of the radiating plates is provided with a plurality of heat exchange channels. The heat source structure is in communication with the heat exchange channel, and the hot air generated by the heat source structure flows into the heat exchange channel, and the baking channel is heated by heat exchange through the two radiating plate components.

Further, the baking structure further includes a steel belt support bracket, and the steel belt support bracket is located in the baking channel.

Further, the steel strip supporting bracket is made of cast iron.

Further, each of the radiation plates includes an upper plate, a lower plate, and a middle spacer, the upper plate is fixed to the lower plate, and the middle spacer is located between the upper plate and the lower plate and The radiation plate is divided into a plurality of the heat exchange channels.

Further, each of the radiating plates is provided with an air inlet adjustment port, the air inlet adjustment port is in communication with the heat exchange channel, and the air inlet adjustment port includes an air inlet box, a lower orifice plate, an upper movable orifice plate, and A manual pull rod, which is fixedly installed on the upper movable orifice plate, the upper movable orifice plate is movably connected to the lower movable plate, and the distance between the lower orifice plate and the upper movable orifice plate is adjusted The amount of incoming air is controlled so as to adjust the temperature of the baking channel.

Further, the tunnel furnace further includes a thermal circulation structure, and the thermal circulation structure includes a return air passage and a radiation circulation fan, the return air passage is in communication with the radiation circulation fan, and each of the radiation plate components is in communication with the radiation circulation fan. The return air channel is connected.

Further, the radiation cycle fan is provided with a damper, and the thermal cycle structure includes a damper actuator and a humidity sensor, and the humidity sensor monitors the humidity in the radiation cycle fan. When the humidity reaches a preset value, all the The damper actuator opens the damper to exhaust gas.

Further, the heat source structure includes a burner, a burner, and a gas premixing chamber. The burner is in communication with the burner. The radiation circulation fan is in communication with the burner and communicates with the burner through the burner. The gas premixing chamber is in communication, and the gas cooled in the radiation circulation fan is mixed with the hot gas generated by the burner in the gas premixing chamber.

Further, the tunnel furnace further includes a control device, the control device includes an over-temperature sensing probe, the over-temperature sensing probe is installed in the gas premixing chamber and monitors the temperature of the gas premixing chamber to prevent the gas premixing chamber The heat source structure temperature is too high to cause damage.

Further, the control device further includes a temperature sensing probe, which monitors the temperature of the air inlet of the fan, so that the control device can adjust the temperature of the baking channel to bake different products.

Compared with the prior art, the baking structure in the tunnel furnace of the present invention includes two radiating plate components, and the two radiating plate components surround a baking channel. Each radiating plate component includes a plurality of radiating plates, and several radiating plates are fixedly connected to each other. The plate is provided with several heat exchange channels. The heat exchange channels of several radiating plates communicate with each other. The heat source structure communicates with the heat exchange channels. The hot air generated by the heat source structure flows into the heat exchange channels. The radiant panel components can be radiantly heated, and the steel belt support bracket can conduct heating. Compared with the heating method of thermal convection, it saves energy more, has high energy efficiency and better temperature stability.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a perspective view of a tunnel furnace according to the present invention;

2 is a schematic diagram of an internal structure of the tunnel furnace of FIG. 1;

3 is a schematic diagram of another internal structure of the tunnel furnace of FIG. 2

4 is an exploded view of a radiant plate of the tunnel furnace of FIG. 2;

FIG. 5 is an exploded view of an air inlet of the tunnel furnace of FIG. 2.

In the picture: 100, tunnel furnace; 10, shell; 12, observation window; 20, baking structure; 21, radiation plate assembly; 210, upper plate; 211, lower plate; 212, middle spacer; 213, heat exchange Passage; 214, air inlet; 2140, air inlet box; 2141, upper movable orifice plate; 2142, lower orifice plate; 2143, manual drawbar; 22, steel belt support bracket; 23, baking channel; 30, heat source structure; 31. Burner; 32. Combustion cylinder; 33. Gas premixing chamber; 40. Thermal circulation structure; 41. Return air passage; 42; Radiation circulation fan; 420; Damper; 51; Overtemperature sensing probe; 52; Humidity sensor ; 53, temperature sensing probe.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that when a component is called "fixed to" another component, it may be directly on another component or a centered component may exist. When a component is considered to be "connected" to another component, it can be directly connected to another component or a centered component may exist at the same time. When a component is considered to be “set on” another component, it can be directly set on another component or a centered component may exist at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

1 to 5, a tunnel furnace 100 according to the present invention includes a casing 10, a baking structure 20, a heat source structure 30, a thermal cycle structure 40 and a control device.

The casing 10 is provided with a plurality of observation windows 12. Several observation windows 12 are arranged at intervals to facilitate observation of the product to adjust the temperature. The baking structure 20 includes two radiating plate assemblies 21 and a steel belt supporting bracket 22. The two radiation plate assemblies 21 are fixedly connected and parallel to each other. A baking channel 23 is enclosed between the two radiation plate assemblies 21. The steel belt support bracket 22 is mounted on the baking tunnel 23. Each radiating panel assembly 21 includes a plurality of radiating panels. Each radiating plate includes an upper plate 210, a lower plate 211, and a middle spacer 212. The upper plate 210 is fixed to the lower plate 211. The middle spacer 212 is located between the upper plate 210 and the lower plate 211 and separates the radiating plate into a plurality of heat exchangers. Channel 213. Each radiation plate is provided with an air inlet 214, which includes an air inlet box 2140, a lower orifice plate 2142, an upper movable orifice plate 2141, and a manual lever 2143. The manual lever 2143 is fixed to the upper movable orifice plate 2141 and the upper movable orifice plate. 2141 is movably installed in the air inlet box 2140. The distance between the upper movable orifice plate 2141 and the lower orifice plate 2142 is adjusted by a manual pull rod 2143, and the upper position is changed by adjusting the relative position between the upper movable orifice plate 2141 and the lower orifice plate 2142. The size of the opening area between the movable orifice plate 2141 and the lower orifice plate 2142 controls the amount of air entering the radiating plate and adjusts the temperature inside the baking channel 23.

The heat source structure 30 includes a burner 31, a combustion cylinder 32, and a gas premixing chamber 33. The combustion cylinder 32 includes an inner cylinder and an outer cylinder. The two ends of the inner cylinder of the combustion cylinder 32 communicate with the burner 31 and the gas premixing chamber 33, respectively. One end of the outer cylinder of the combustion cylinder 32 is in communication with the gas premixing chamber 33.

The thermal cycle structure 40 includes a return air passage 41, a radiation circulation fan 42, a humidity sensor 52, and an actuator. The radiation circulation fan 42 is provided with a damper 420, and the actuator controls the damper 420. The return air passage 41 is in communication with the radiation circulation fan 42. The humidity sensor 52 and the actuator are mounted on the radiation circulation fan 42. The humidity sensor 52 is electrically connected to the actuator. The humidity sensor 52 monitors the humidity in the radiation circulation fan 42. When the humidity reaches a preset value, the actuator controls the damper 420 to open and exhaust part of the circulating gas; when the humidity is less than the preset value, The actuator control damper 420 is closed.

The control device includes an overtemperature sensing probe 51 and a temperature sensing probe 53. The over-temperature sensing probe 51 is installed in the gas pre-mixing chamber 33 and monitors the temperature of the gas pre-mixing chamber 33 to prevent damage to the heat source structure 30 due to excessive temperature. The temperature sensing probe 53 monitors the temperature of the air inlet of the fan, so that the control device can adjust the temperature of the baking channel 23 to bake different products.

When the tunnel oven 100 is used, the food to be baked is placed in the baking tunnel 23. The burner 31 of the heat source structure 30 works to generate hot gas, and flows into the gas premixing chamber 33 through the inner cylinder of the combustion cylinder 32. The cooling gas in the radiation circulation fan 42 flows into the gas premixing chamber 33 through the outer cylinder of the combustion cylinder 32 and communicates with the hot gas. After mixing the equilibrium temperature, it enters the heat exchange channel 213 of the radiation plate assembly 21 through the bottom of the gas premixing chamber 33. During the flow of airflow in the heat exchange channel 213, the radiating plate assembly 21 radiates heat to the baking channel 23, and the steel belt support bracket 22 also conducts heat at the same time, so that the product is baked. In this process, the observation window 12 can observe the product, and the temperature sensing probe 53 monitors the temperature of the air inlet of the fan, so that the control device can adjust the temperature of the baking channel 23 to bake different products. By adjusting the size of the air inlet, the amount of air entering the radiant panel is controlled, and the temperature inside the baking channel 23 is adjusted. The temperature of the airflow flowing through the radiation plate assembly 21 decreases and flows into the radiation circulation fan 42 from the return air passage 41, and then flows into the gas premixing chamber 33 from the radiation circulation fan 42 through the outer cylinder of the combustion cylinder 32 and mixes with the hot gas to form a cycle.

In the above design, radiant heating can be performed between the two radiating plate assemblies 21, and the steel belt support bracket 22 can conduct heating. Compared with the heating method of heat convection, it can save energy, have high energy utilization rate, and have better temperature stability.

For those skilled in the art, according to the technical solutions and concepts described above, various other corresponding changes and deformations can be made, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (10)

A tunnel furnace includes a shell, a heat source structure, and a baking structure. The heat source structure and the baking structure are fixedly installed on the shell, and the baking structure includes two radiating plate components. The radiating plate components surround a baking channel. Each of the radiating plate components includes a plurality of radiating plates. The radiating plates are fixedly connected to each other. Each of the radiating plates is provided with a plurality of heat exchange channels. The heat exchange channels are in communication with each other, the heat source structure is in communication with the heat exchange channels, and the hot air generated by the heat source structure flows into the heat exchange channels, and the bake channels are heated by heat exchange through the two radiating plate components. The tunnel furnace according to claim 1, wherein the baking structure further comprises a steel belt support bracket, and the steel belt support bracket is located in the baking channel. The tunnel furnace according to claim 2, wherein the steel strip supporting bracket is made of cast iron. The tunnel furnace according to claim 1, wherein each of the radiating plates includes an upper flat plate, a lower flat plate, and a middle spacer, the upper flat plate is fixed to the lower plate, and the middle spacer is located in the The upper plate and the lower plate are divided into a plurality of the heat exchange channels. The tunnel furnace according to claim 4, characterized in that: each of the radiating plates is provided with an air inlet adjustment port, the air inlet adjustment port is in communication with the heat exchange channel, and the air inlet adjustment port includes an air inlet The bellows, the lower orifice plate, the upper movable orifice plate, and the manual drawbar are fixedly installed on the upper movable orifice plate, and the upper movable orifice plate is movably connected to the lower orifice plate, and the lower orifice plate is adjusted by adjusting And the distance between the upper movable orifice plate controls the amount of air intake, so as to adjust the temperature of the baking channel. The tunnel furnace according to claim 5, wherein the tunnel furnace further comprises a thermal cycle structure, and the thermal cycle structure includes a return air passage and a radiation circulation fan, and the return air passage is in communication with the radiation circulation fan Each of the radiating panel components is in communication with the return air channel. The tunnel furnace according to claim 6, wherein the radiation circulation fan is provided with a damper, and the thermal circulation structure comprises a damper actuator and a humidity sensor, and the humidity sensor monitors the humidity in the radiation circulation fan, When the humidity reaches a preset value, the damper actuator opens the damper to exhaust gas. The tunnel furnace according to claim 6, wherein the heat source structure comprises a burner, a burner, and a gas premixing chamber, the burner is in communication with the burner, and the radiation circulation fan is in communication with the combustion The cylinder is in communication with the gas premixing chamber through the combustion cylinder, and the gas cooled in the radiation circulation fan and the hot gas generated by the burner are mixed in the gas premixing chamber. The tunnel furnace according to claim 8, characterized in that: the tunnel furnace further comprises a control device, the control device comprises an over-temperature induction probe, the over-temperature induction probe is installed in the gas premixing chamber and monitors The temperature of the gas premixing chamber is used to prevent the heat source structure temperature from being too high to cause damage. The tunnel furnace according to claim 8, wherein the control device further comprises a temperature sensing probe, the temperature sensing probe monitors the temperature of the air inlet of the fan, so that the control device adjusts the temperature of the baking channel, Bake different products.

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