CN210671851U

CN210671851U - Tunnel furnace

Info

Publication number: CN210671851U
Application number: CN201920409451.9U
Authority: CN
Inventors: 邵鸿飞
Original assignee: Guangzhou Bake Oven Machinery Co ltd
Current assignee: Guangzhou Bake Oven Machinery Co ltd
Priority date: 2018-06-27
Filing date: 2019-03-28
Publication date: 2020-06-05
Anticipated expiration: 2029-03-28

Abstract

The utility model discloses a tunnel furnace, which comprises a shell, a heat source structure, a baking structure and a heat circulation structure, wherein the heat source structure, the baking structure and the heat circulation structure are fixedly arranged on the shell; the radiation plate assembly and the side plate are enclosed to form a baking channel, a heat exchange channel is arranged in the radiation plate assembly, one end of the heat exchange channel is communicated with the heat circulation structure, and the other end of the heat exchange channel, the heat source structure and the heat circulation structure are sequentially communicated, so that a closed annular circulation channel is formed; and an exhaust valve for communicating the circulating channel with the outside is arranged on the heat circulating structure. The utility model provides a tunnel furnace has energy-conservation, controllable advantage of temperature stabilization.

Description

Tunnel furnace

Technical Field

The utility model relates to a heating device especially relates to a tunnel furnace.

Background

Heat transfer is a complex phenomenon generally divided into three basic modes, heat conduction, heat convection and heat radiation. The heat transfer processes carried out in production and life are often a combination of these three basic ways in different proportions. The food baking process is accompanied by complex chemical and physical changes. Dehydration is a function of food baking. The conduction heating requires the product to be contacted with the heat conducting plate, and the part which is not contacted is slowly heated; the heat convection is to heat the product by flowing medium, the heat effect is the best, but the temperature fluctuation is large; the radiant heating heat transfer is slow, the constant temperature performance is good, and the energy utilization rate is high. Heat conduction, heat convection and heat radiation have advantages and disadvantages, and a proper heating mode is selected to achieve a more ideal effect aiming at different products in the baking industry.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior baking technology, the utility model aims to provide a tunnel furnace with high energy utilization rate and good temperature stability.

The purpose of the utility model is realized by adopting the following technical scheme:

a tunnel furnace comprises a shell, a heat source structure, a baking structure and a heat circulation structure, wherein the heat source structure, the baking structure and the heat circulation structure are fixedly arranged on the shell, the baking structure comprises a radiation plate assembly and a side plate, and the radiation plate assembly consists of one radiation plate or is formed by splicing a plurality of radiation plates; the radiation plate assembly and the side plate are enclosed to form a baking channel, a heat exchange channel is arranged in the radiation plate assembly, one end of the heat exchange channel is communicated with the heat circulation structure, and the other end of the heat exchange channel, the heat source structure and the heat circulation structure are sequentially communicated, so that a closed annular circulation channel is formed; and an exhaust valve for communicating the circulating channel with the outside is arranged on the heat circulating structure. When the pressure or humidity in the circulating air is too high, the exhaust valve is opened to exhaust part of the circulating air, reduce moisture and reduce pressure.

Further, the baking structure further comprises a conveying device, and the conveying device is installed in the baking channel. The conveying device mainly comprises an automatic conveyor belt and other mechanisms for conveying baked articles.

Further, the baking channel at least comprises two radiation plate assemblies which are arranged in parallel. The two parallel radiation plate assemblies are arranged, so that the baked objects can be heated more uniformly.

Furthermore, the radiant panel includes last flat board, lower flat board and intermediate spacing muscle, go up the flat board with lower flat board fixed connection, intermediate spacing muscle is located go up the flat board with down between the flat board and cut apart the space between last flat board and the lower flat board and form heat transfer passageway. The structure is simple, and the heat is easily radiated into the baking channel

Furthermore, an air inlet adjusting device is arranged on the heat exchange channel and is communicated with the heat exchange channel, the air inlet adjusting device comprises an air inlet air box, a lower fixing plate and an upper movable adjusting plate, and air holes are formed in the lower fixing plate and the upper movable adjusting plate; the upper movable adjusting plate is connected with the lower fixing plate in a sliding manner; the upper movable adjusting plate and the lower fixing plate slide mutually, so that the ventilation quantity of the ventilation holes is controlled. The air inlet adjusting device is used for controlling the air quantity entering the heat exchange channel to realize the temperature control of the baking device.

Furthermore, the heat circulation structure comprises a return air channel and a radiation circulating fan, the return air channel is communicated with the radiation circulating fan, and the heat exchange channel is communicated with the return air channel; the radiation circulating fan is provided with an air door used for controlling the ventilation and return air volume. The air door is used for controlling the amount of cold air flowing into the heat source structure, so that the overall temperature of the machine can be controlled.

Further, the heat source structure further includes a combustion cylinder; the combustion cylinder comprises an inner cylinder and an outer cylinder which are sleeved; the inner cylinder is communicated with a combustor, and hot gas generated by the combustor is sprayed to the gas premixing chamber from the inner cylinder; a gap is formed between the outer cylinder and the inner cylinder, the gap is communicated with the radiation circulating fan, cold air in the radiation circulating fan is sprayed to the air premixing chamber through the gap, and the spraying directions of the hot air and the cold air are the same. The combustion barrel of the inner barrel and the outer barrel which are sleeved can prevent cold air from interfering the work of the burner and prevent the situation that the fire is extinguished or the work is unstable in the burner.

Further, the tunnel furnace also comprises a control device, wherein the control device comprises an overtemperature induction probe, and the overtemperature induction probe is installed in the gas premixing chamber and monitors the temperature in the gas premixing chamber and is used for preventing the heat source structure from being damaged due to overhigh temperature.

Further, controlling means still includes temperature-sensing probe, temperature-sensing probe monitoring fan air intake temperature to controlling means adjusts toast the temperature of passageway, toasts different products.

Compared with the prior art, the utility model discloses toast the structure in tunnel furnace includes two radiation panel subassemblies, and two radiation panel subassemblies enclose into the passageway of toasting including the both sides board, can the radiant heating toast the passageway between two radiation panel subassemblies, for the heating method who gives first place to with the heat convection, energy saving more, energy utilization rate is high, temperature stability is better.

Drawings

FIG. 1 is a perspective view of the tunnel furnace of the present invention;

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

FIG. 3 is another schematic view of the inner structure of the tunnel furnace of FIG. 2

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

FIG. 5 is an exploded view of an air intake adjusting device of the tunnel furnace of FIG. 2.

In the figure: 100. a tunnel furnace; 10. a housing; 12. an observation window; 20. a baking structure; 21. a radiant panel assembly; 210. an upper flat plate; 211. a lower flat plate; 212. middle spacing ribs; 213. a heat exchange channel; 214. an air inlet adjusting device; 2140. an air inlet bellows; 2141. an upper movable adjusting plate; 2142. a lower fixing plate; 2143. a manual pull rod; 22. a conveying device; 23. baking the channel; 30. a heat source structure; 31. a combustion engine; 32. a combustion can; 33. a gas premixing chamber; 40. a thermal cycling structure; 41. an air return channel; 42. a radiation circulating fan; 420. an exhaust valve; 51. an overtemperature sensing probe; 52. a humidity sensor; 53. a temperature sensing probe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, a tunnel furnace 100 of the present invention includes a housing 10, a baking structure 20, a heat source structure 30, a heat circulation structure 40, and a control device.

The housing 10 is provided with a number of viewing windows 12. Several viewing windows 12 are spaced apart to allow for viewing of the product to adjust temperature. The baking structure 20 comprises two radiation plate assemblies 21 and a conveying device 22 which are arranged in parallel. The two radiation plate assemblies 21 are fixedly connected and parallel to each other. The two radiation plate assemblies 21 and the side plates define a baking channel 23. The conveyor 22 is mounted in the toasting channel 23. Each radiation plate assembly 21 comprises one or several radiation plates. Each radiation plate comprises an upper flat plate 210, a lower flat plate 211 and a middle spacing rib 212, wherein the upper flat plate 210 is fixed on the lower flat plate 211, and the middle spacing rib 212 is positioned in a gap between the upper flat plate 210 and the lower flat plate 211 to divide the gap into a plurality of heat exchange channels 213. Each radiation plate is provided with an air inlet adjusting device 214, the air inlet adjusting device 214 comprises an air inlet air box 2140, a lower fixing plate 2142, an upper movable adjusting plate 2141 and a manual pull rod 2143, the manual pull rod 2143 is fixedly installed on the upper movable adjusting plate 2141, the upper movable adjusting plate 2141 is slidably installed on the air inlet air box 2140, the position between the upper movable adjusting plate 2141 and the lower fixing plate 2142 is adjusted through the manual pull rod 2143, the size of an air vent on the upper movable adjusting plate 2141 and the lower fixing plate 2142 is changed by adjusting the relative position between the upper movable adjusting plate 2141 and the lower fixing plate 2142, the air quantity entering the radiation plates is controlled, and the temperature inside the baking channel 23 is adjusted.

The heat source structure 30 includes a combustor 31, a combustion liner 32, and a gas premix chamber 33. The combustion cylinder 32 includes an inner cylinder and an outer cylinder. Both ends of the inner cylinder of the combustion cylinder 32 are respectively communicated with the combustor 31 and the gas premixing chamber 33. One end of the outer cylinder of the combustor cylinder 32 communicates with a gas premixing chamber 33.

The thermal cycle 40 includes a return air channel 41, a radiant circulator blower 42, a humidity sensor 52, and an actuator. The radiant circulator blower 42 is provided with an exhaust valve 420, and the actuator controls the exhaust valve 420. The return air passage 41 communicates with a radiation circulation fan 42. The humidity sensor 52 and actuators are mounted to the radiant circulator blower 42. The humidity sensor 52 is electrically connected with the actuator, the humidity sensor 52 monitors the humidity in the radiation circulating fan 42, and when the overall air pressure or humidity reaches a preset value, the actuator controls the exhaust valve 420 to be opened to exhaust part of the circulating gas; when the air pressure or humidity is less than the preset value, the actuator controls the exhaust valve 420 to close. The radiation circulating fan 42 is also provided with an air door for controlling the amount of cooling air flowing back and forth.

The control device comprises an overtemperature sensing probe 51 and a temperature sensing probe 53. An over temperature sensing probe 51 is mounted to the gas premix chamber 33 and monitors the temperature within the gas premix chamber 33 to prevent damage from excessive temperatures of the heat source structure 30. The temperature sensing probe 53 monitors the temperature of the air inlet adjusting device 214, so as to control the air inlet adjusting device 214, and further adjust the temperature of the baking channel 23, and bake different products.

In use of the tunnel oven 100, the food to be toasted is placed in the toasting channel 23. The combustor 31 of the heat source structure 30 generates hot gas during operation, the hot gas flows into the gas premixing chamber 33 through the inner cylinder of the combustion cylinder 32, the cooling gas driven by the radiation circulating fan 42 flows into the gas premixing chamber 33 through the gap between the outer cylinder and the inner cylinder of the combustion cylinder 32, and the cooling gas is mixed with the hot gas to reach a balanced temperature, and then enters the heat exchange channel 213 of the radiation plate assembly 21 through the bottom of the gas premixing chamber 33. During the air flow flowing in the heat exchanging channel 213, the radiation plate assembly 21 radiates heat to the baking channel 23, and the heat is conducted by the conveyor belt due to the radiation plate assembly 21 arranged oppositely and parallelly, so that the product is baked. In the process, the observation window 12 can observe the products, 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. The air quantity entering the radiation plate is controlled by adjusting the size of the vent hole of the air inlet adjusting device 214, and the temperature inside the baking channel 23 is adjusted. The air flowing through the radiant panel assembly 21 is cooled and flows from the return air duct 41 to the radiant circulator blower 42, and then flows from the radiant circulator blower 42 through the outer cylinder of the burner cylinder 32 to the air pre-mixing chamber 33 and mixes with the hot air to form a cycle.

Can radiant heating between two radiation panel components 21 in the above-mentioned design to the conveyer belt can conduction heating, for the heating method who gives first place to with heat convection, energy saving more, energy utilization is high, temperature stability is better. The heating mode mainly by radiation can be used, and the heat convection is used as the assistance to achieve better effect.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. A tunnel furnace is characterized in that: the baking structure comprises a radiation plate assembly and a side plate, wherein the radiation plate assembly consists of one radiation plate or is formed by splicing a plurality of radiation plates; the radiation plate assembly and the side plate are enclosed to form a baking channel, a heat exchange channel is arranged in the radiation plate assembly, one end of the heat exchange channel is communicated with the heat circulation structure, and the other end of the heat exchange channel, the heat source structure and the heat circulation structure are sequentially communicated, so that a closed annular circulation channel is formed; and an exhaust valve for communicating the circulating channel with the outside is arranged on the heat circulating structure.

2. The tunnel furnace of claim 1, wherein: the baking structure further comprises a conveying device, and the conveying device is installed in the baking channel.

3. The tunnel furnace of claim 1, wherein: the baking channel at least comprises two radiation plate assemblies which are arranged in parallel.

4. The tunnel furnace of claim 1, wherein: the radiation plate comprises an upper flat plate, a lower flat plate and middle spacing ribs, the upper flat plate is fixedly connected with the lower flat plate, and the middle spacing ribs are located between the upper flat plate and the lower flat plate and divide gaps between the upper flat plate and the lower flat plate to form the heat exchange channels.

5. The tunnel furnace of claim 4, wherein: the heat exchange device comprises a heat exchange channel, an air inlet adjusting device and a heat exchange device, wherein the heat exchange channel is provided with the air inlet adjusting device, the air inlet adjusting device is communicated with the heat exchange channel and comprises an air inlet air box, a lower fixing plate and an upper movable adjusting plate, and air holes are formed in the lower fixing plate and the upper movable adjusting plate; the upper movable adjusting plate is connected with the lower fixing plate in a sliding manner; the upper movable adjusting plate and the lower fixing plate slide mutually, so that the ventilation quantity of the ventilation holes is controlled.

6. The tunnel furnace of claim 5, wherein: the heat circulation structure comprises a return air channel and a radiation circulating fan, the return air channel is communicated with the radiation circulating fan, and the heat exchange channel is communicated with the return air channel; the radiation circulating fan is provided with an air door used for controlling the ventilation and return air volume.

7. The tunnel furnace of claim 6, wherein: the heat source structure further comprises a combustion cylinder; the combustion cylinder comprises an inner cylinder and an outer cylinder which are sleeved; the inner cylinder is communicated with a combustor, and hot gas generated by the combustor is sprayed to the gas premixing chamber from the inner cylinder; and a gap is formed between the outer cylinder and the inner cylinder, the gap is communicated with the radiation circulating fan, and cold air in the radiation circulating fan is sprayed to the gas premixing chamber through the gap.

8. The tunnel furnace of claim 7, wherein: the tunnel furnace further comprises a control device, wherein the control device comprises an overtemperature induction probe, and the overtemperature induction probe is installed in the gas premixing chamber and monitors the temperature in the gas premixing chamber and is used for preventing the heat source structure from being damaged due to overhigh temperature.