Tunnel furnace capable of automatically exhausting

Abstract

The tunnel furnace comprises an outer furnace body and an inner furnace body, the outer furnace body is arranged on the periphery of the inner furnace body in a surrounding mode, a hollow heat preservation interlayer is arranged between the outer furnace body and the inner furnace body, the lower side of the outer furnace body is provided with a waste gas port communicated with the heat preservation interlayer, the upper side of the outer furnace body is provided with an exhaust port, and the exhaust port is communicated with the heat preservation interlayer. An air inlet is formed in the upper side of the inner furnace body, a centrifugal fan is arranged at the position, located at the air inlet, of the inner furnace body, and an air inlet communicated with the air inlet, a first air outlet communicated with the heat preservation interlayer and a second air outlet communicated with the exhaust port are formed in the centrifugal fan. A switching mechanism used for controlling the air inlet to be communicated with the first air outlet or the second air outlet is arranged in the centrifugal fan. According to the utility model, a small amount of air can be slowly exhausted, a large amount of air can be quickly exhausted, and the exhausted hot air can be subjected to heat recovery.

Description

Technical Field

[0001] This utility model relates to the field of tunnel furnace technology, specifically to a tunnel furnace with automatic exhaust function. Background Technology

[0002] Tunnel ovens are mainly used to heat or dry food. The baking time, temperature and air volume will affect the quality of the food. When food is baked in a tunnel oven, the internal heat needs to be released. However, existing tunnel ovens directly release the heat, which is not only a waste of energy, but also causes thermal pollution.

[0003] In view of this, the inventors of this case conducted in-depth research on the above-mentioned problems, which led to the creation of this case. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing an energy-saving and environmentally friendly tunnel furnace that can recover heat from emitted hot gas and has two exhaust methods: slow exhaust in small quantities and rapid exhaust in large quantities.

[0005] The solution adopted by this utility model to solve the technical problem is: a tunnel furnace with automatic exhaust, including an outer furnace body and an inner furnace body. The outer furnace body is arranged around the outer periphery of the inner furnace body. A hollow heat-insulating interlayer is provided between the outer furnace body and the inner furnace body. The lower side of the outer furnace body is provided with an exhaust port communicating with the heat-insulating interlayer. The upper side of the outer furnace body is provided with an exhaust port. The upper side of the inner furnace body is provided with an air inlet. A centrifugal fan is provided on the inner furnace body at the air inlet. The centrifugal fan is provided with an air inlet communicating with the air inlet, a first air outlet communicating with the heat-insulating interlayer, and a second air outlet communicating with the exhaust port. The centrifugal fan is provided with a switching mechanism for controlling the connection between the air inlet and the first or second air outlet.

[0006] Furthermore, in order to form two air outlets to achieve both slow and fast exhaust modes, thereby flexibly utilizing the heat energy that needs to be discharged; the centrifugal fan includes a casing, a motor, and an impeller. The casing is installed between the inner furnace body and the outer furnace body. The impeller is rotatably installed inside the casing and is located at the air inlet. The motor is fixedly installed on the outer furnace body and is driven by the impeller to drive the impeller to rotate. The first air outlet and the second air outlet are centrally symmetrically arranged on the casing.

[0007] Furthermore, in order to switch the air inlet to be connected to the first air outlet or the second air outlet, the switching mechanism includes a first damper for blocking the first air outlet and a second damper for blocking the second air outlet. Both the first damper and the second damper have an arc-shaped structure. One end of both the first damper and the second damper is rotatably installed in the housing. The housing is provided with a first driver for driving the first damper to rotate and adjust the opening of the first air outlet, and a second driver for driving the second damper to rotate and adjust the opening of the second air outlet.

[0008] Furthermore, in order to filter the oil fumes inside the tunnel furnace and prevent them from polluting or damaging equipment such as fans, an oil fume filtration mechanism is provided at the air inlet of the inner furnace body. The oil fume filtration mechanism includes an unwinding shaft for mounting filter cotton rolls, a bracket for spreading the filter cotton, a winding shaft for winding the filter cotton, and a winding device for driving the winding shaft to rotate. The unwinding shaft is located on one side of the bracket, and the winding shaft is located on the other side of the bracket. The bracket is provided with a cotton groove that runs through the bracket for laying the filter cotton flat. A pressure sensor for sensing the weight of the filter cotton is provided at the bottom of the cotton groove. The pressure sensor is connected to the winding device so that when the pressure sensor senses that the weight of the filter cotton has reached a set value, the winding device is activated to drive the winding shaft to rotate and automatically replace the filter cotton.

[0009] Furthermore, to prevent hot gas from condensing and flowing back into the tunnel oven to contaminate food during the exhaust process, an anti-condensation mechanism is provided at the exhaust port of the outer furnace body. The anti-condensation mechanism includes a heating bend, a vertically arranged exhaust pipe, and a heat exchange pipe surrounding the exhaust pipe. The heating bend, exhaust pipe, and heat exchange pipe are all made of thermally conductive material. One end of the heating bend is connected to the exhaust port, and the other end is connected to the lower side of the exhaust pipe. The exhaust pipe has a connection port for connecting to the heating bend, and the bottom of the exhaust pipe has a water outlet located below the connection port. Several heat exchange plates are provided between the exhaust pipe and the heat exchange pipe. The lower end of the heat exchange pipe is connected to the heating bend to conduct heat from the exhaust pipe to the heating bend, thereby heating the heating bend and preventing the exhaust gas from condensing and flowing back.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] (1) This utility model sets two exhaust methods and, by modifying the centrifugal fan, enables one centrifugal fan to flow in two directions at the same time or to flow in any one of the two directions alone, thereby realizing two exhaust methods: large-volume rapid exhaust and small-volume slow exhaust of the tunnel furnace. The exhaust method can be flexibly switched as needed, making it very convenient to use.

[0012] (2) The hot gas that is slowly discharged in this utility model will be guided into the hollow jacket to keep the tunnel oven warm. The hot gas that is discharged quickly will also transfer heat to the heating bend through the heat exchange tube. While recovering and utilizing the heat energy, the heating bend can be heated to prevent the hot gas from condensing into water when it comes into contact with the heating bend. The exhaust pipe is set vertically. When the flue gas flows into the exhaust pipe and condenses into water, it can flow out from the water outlet at the bottom of the exhaust pipe, thereby effectively preventing the condensate from flowing back into the tunnel oven and contaminating the food.

[0013] (3) This utility model also provides a flue gas filtration mechanism, which filters the oil fumes through filter cotton. The oil fumes are trapped by the filter cotton, which will form oil stains and accumulate on the filter cotton, resulting in an increase in the weight of the filter cotton. The filter cotton sags under gravity and applies pressure to the pressure sensor. When the pressure sensor reaches the set value, it will send a signal to the winding device. The winding device drives the winding shaft to rotate and roll up the filter cotton, laying new filter cotton on the cotton trough. The structure of automatic filter cotton replacement can ensure a better filtration effect, thereby effectively preventing oil fumes from entering the centrifugal fan. 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 schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0017] Figure 3 Schematic diagram of centrifugal fan structure Figure 1 ;

[0018] Figure 4 Schematic diagram of centrifugal fan structure Figure 2 ;

[0019] Figure 5 This is a schematic diagram of the fume filtration mechanism.

[0020] Figure 6 This is a schematic diagram of the anti-condensation mechanism.

[0021] In the diagram: 1. Conveying mechanism; 2. Outer furnace body; 21. Exhaust port; 22. Exhaust port; 3. Inner furnace body; 31. Air inlet; 4. Heating mechanism; 5. Centrifugal fan; 51. Housing; 511. Air inlet; 512. First air outlet; 513. Second air outlet; 52. Motor; 53. Impeller; 54. First damper; 55. Second damper; 56. First driver; 57. Second driver; 6. Fume filtration mechanism; 6. Unwinding shaft; 61. Support; 62. Cotton trough; 621. Rewinding shaft; 63. Pressure sensor; 64. Filter cotton; 65. Anti-condensation mechanism; 7. Heating bend; 71. Exhaust pipe; 72. Water outlet; 721. Heat exchanger tube; 73. Heat exchanger plate; 74. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0023] Example: Figure 1-6 As shown, this embodiment provides an automatically venting tunnel furnace, including a conveying mechanism 1, a heating mechanism 4, an outer furnace body 2, and an inner furnace body 3. The outer furnace body 2 is arranged around the outer periphery of the inner furnace body 3. A hollow insulation interlayer is provided between the outer furnace body 2 and the inner furnace body 3. The lower side of the outer furnace body 2 is provided with a waste gas port 21 communicating with the insulation interlayer. The upper side of the outer furnace body 2 is provided with an exhaust port 22. The upper side of the inner furnace body 3 is provided with an air inlet 31. A centrifugal fan 5 is provided on the inner furnace body 3 at the air inlet 31. The centrifugal fan 5 is provided with an air inlet 511 communicating with the air inlet 31, a first air outlet 512 communicating with the insulation interlayer, and a second air outlet 513 communicating with the exhaust port 22. The centrifugal fan 5 is provided with a switching mechanism for controlling the connection between the air inlet 511 and the first air outlet 512 or the second air outlet 513.

[0024] In this embodiment, to form two air outlets, both slow and fast exhaust methods are achieved, thus flexibly utilizing the heat energy that needs to be discharged; the centrifugal fan 5 includes a casing 51, a motor 52, and an impeller 53. The casing 51 is installed between the inner furnace body 3 and the outer furnace body 2. The impeller 53 is rotatably installed inside the casing 51 and is located at the air inlet 511. The motor 52 is fixedly installed on the outer furnace body 2, and the motor 52 drives the impeller 53. The connection drives the impeller 53 to rotate. The first air outlet 512 and the second air outlet 513 are centrally symmetrically arranged on the casing 51. Here, the motor 52 is a variable frequency motor 52. When a small amount of exhaust is required, the motor 52 starts at a low speed and draws in a small amount of hot air, which is discharged through the first air outlet 512 to the insulation jacket to keep the tunnel furnace warm. When a large amount of exhaust is required, the motor 52 starts at a high speed and draws in a large amount of hot air, which is discharged to the exhaust port 22 or to the insulation jacket and the exhaust port 22.

[0025] In this embodiment, in order to switch the air inlet 511 to be connected with the first air outlet 512 or the second air outlet 513, the switching mechanism includes a first damper 54 for blocking the first air outlet 512 and a second damper 55 for blocking the second air outlet 513. Both the first damper 54 and the second damper 55 have an arc-shaped structure. One end of the first damper 54 and the second damper 55 are rotatably installed in the housing 51. The other end of the first damper 54 and the second damper 55 are provided with magnets. The housing 51 is provided with a first energized coil and a second energized coil for attracting the magnets to keep the first damper 54 and the second damper 55 closed. The housing 51 is also provided with a first driver 56 for driving the first damper 54 to rotate and adjust the opening of the first air outlet 512 and a second driver 57 for driving the second damper 55 to rotate and adjust the opening of the second air outlet 513.

[0026] In this embodiment, in order to filter the oil fumes inside the tunnel furnace and prevent the oil fumes from polluting or damaging equipment such as fans, an oil fume filtration mechanism 6 is provided at the air inlet 31 of the inner furnace body 3. The oil fume filtration mechanism 6 includes an unwinding shaft 61 for mounting the filter cotton 65 roll, a bracket 62 for spreading the filter cotton 65, a winding shaft 63 for winding the filter cotton 65, and a winding device for driving the winding shaft 63 to rotate. The unwinding shaft 61 is located on one side of the bracket 62, and the winding shaft 63 is located on the other side of the bracket 62. The bracket 62 is provided with a cotton groove 621 that passes through the bracket 62 for laying the filter cotton 65 flat. The bottom of the cotton groove 621 is provided with a pressure sensor 64 for sensing the weight of the filter cotton 65. The pressure sensor 64 is connected to the winding device so that when the pressure sensor 64 senses that the weight of the filter cotton 65 has reached a set value, the winding device is activated to drive the winding shaft 63 to rotate and automatically replace the filter cotton 65.

[0027] In this embodiment, to prevent hot gas from condensing and flowing back into the tunnel oven to contaminate food during the exhaust process, an anti-condensation mechanism 7 is provided at the exhaust port 22 of the outer furnace body 2. The anti-condensation mechanism 7 includes a heating bend 71, a vertically arranged exhaust pipe 72, and a heat exchange pipe 73 arranged around the outer periphery of the exhaust pipe 72. The heating bend 71, the exhaust pipe 72, and the heat exchange pipe 73 are all made of thermally conductive material. One end of the heating bend 71 is connected to the exhaust port 22, and the other end of the heating bend 71 is connected to the lower side of the exhaust pipe 72. The exhaust pipe 72 is provided with a connection port for connecting to the heating bend 71. The bottom of the exhaust pipe 72 is provided with a water outlet 721 located below the connection port. Several heat exchange plates 74 are provided between the exhaust pipe 72 and the heat exchange pipe 73. The lower end of the heat exchange pipe 73 is connected to the heating bend 71 to conduct the heat from the exhaust pipe 72 to the heating bend 71 to heat the heating bend 71, thereby preventing the exhaust gas from condensing and flowing back.

[0028] This utility model sets up two exhaust methods, and by modifying the centrifugal fan 5, it can realize that one centrifugal fan 5 can flow in two directions at the same time, or flow in either of the two directions alone, thereby realizing two exhaust methods of large-volume rapid exhaust and small-volume slow exhaust of the tunnel furnace. The exhaust method can be flexibly switched as needed, which is very convenient to use.

[0029] The slowly discharged hot air of this invention is guided into the hollow interlayer to keep the tunnel oven warm. The rapidly discharged hot air is also transferred to the heating bend 71 through the heat exchange tube 73, which recovers and utilizes the heat energy and heats the bend. This prevents the hot air from condensing into water when it comes into contact with the bend. The exhaust pipe 72 is set vertically. When the flue gas flows into the exhaust pipe 72 and condenses into water, it can flow out from the water outlet 721 at the bottom of the exhaust pipe 72, thereby effectively preventing the condensate from flowing back into the tunnel oven and contaminating the food.

[0030] This utility model also includes a flue gas filtration mechanism. The oil fumes are filtered by the filter cotton 65. The oil fumes are trapped by the filter cotton 65, and oil stains accumulate on the filter cotton 65, increasing its weight. The filter cotton 65 sags under gravity, applying pressure to the pressure sensor 64. When the pressure on the pressure sensor 64 reaches the set value, it sends a signal to the winding device. The winding device drives the winding shaft 63 to rotate and wind up the filter cotton 65, laying a new filter cotton 65 on the cotton trough 621. The automatic replacement structure of the filter cotton 65 ensures a better filtration effect, thereby effectively preventing oil fumes from entering the centrifugal fan 5.

[0031] The above description is merely an embodiment of this utility model and does not limit the scope of patent protection of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this utility model.

Claims

1. A tunnel furnace with automatic exhaust function, characterized in that: The furnace includes an outer furnace body and an inner furnace body. The outer furnace body is arranged around the outer periphery of the inner furnace body. A hollow insulation layer is provided between the outer furnace body and the inner furnace body. The lower side of the outer furnace body is provided with an exhaust port communicating with the insulation layer. The upper side of the outer furnace body is provided with an exhaust port. The upper side of the inner furnace body is provided with an air inlet. A centrifugal fan is provided on the inner furnace body at the air inlet. The centrifugal fan is provided with an air inlet communicating with the air inlet, a first air outlet communicating with the insulation layer, and a second air outlet communicating with the exhaust port. The centrifugal fan is provided with a switching mechanism for controlling the connection between the air inlet and the first or second air outlet.

2. The tunnel furnace with automatic exhaust capability according to claim 1, characterized in that: The centrifugal fan includes a casing, a motor, and an impeller. The casing is installed between the inner furnace body and the outer furnace body. The impeller is rotatably installed inside the casing and is located at the air inlet. The motor is fixedly installed on the outer furnace body and is connected to the impeller for driving the impeller to rotate. The first air outlet and the second air outlet are centrally symmetrically arranged on the casing.

3. The tunnel furnace with automatic exhaust capability according to claim 2, characterized in that: The switching mechanism includes a first damper for blocking the first air outlet and a second damper for blocking the second air outlet. Both the first damper and the second damper have an arc-shaped structure. One end of both the first damper and the second damper is rotatably installed inside the housing. The housing is provided with a first driver for driving the first damper to rotate and adjust the opening of the first air outlet, and a second driver for driving the second damper to rotate and adjust the opening of the second air outlet.

4. The tunnel furnace with automatic exhaust capability according to claim 1, characterized in that: The air inlet of the inner furnace body is equipped with an oil fume filtration mechanism. The oil fume filtration mechanism includes an unwinding shaft for mounting filter cotton rolls, a bracket for spreading the filter cotton, a winding shaft for winding the filter cotton, and a winding device for driving the winding shaft to rotate. The unwinding shaft is located on one side of the bracket, and the winding shaft is located on the other side of the bracket. The bracket is provided with a cotton groove that runs through the bracket for laying the filter cotton flat. The bottom of the cotton groove is provided with a pressure sensor for sensing the weight of the filter cotton. The pressure sensor is connected to the winding device so that when the pressure sensor senses that the weight of the filter cotton has reached a set value, the winding device is activated to drive the winding shaft to rotate and automatically replace the filter cotton.

5. The tunnel furnace with automatic exhaust capability according to claim 1, characterized in that: The exhaust port of the outer furnace body is equipped with an anti-condensation mechanism, which includes a heating bend, a vertically arranged exhaust pipe, and a heat exchange pipe surrounding the exhaust pipe. The heating bend, exhaust pipe, and heat exchange pipe are all made of thermally conductive material. One end of the heating bend is connected to the exhaust port, and the other end is connected to the lower side of the exhaust pipe. The exhaust pipe has a connection port for connecting to the heating bend, and the bottom of the exhaust pipe has a water outlet located below the connection port. Several heat exchange plates are provided between the exhaust pipe and the heat exchange pipe. The lower end of the heat exchange pipe is connected to the heating bend to conduct heat from the exhaust pipe to the heating bend, thereby heating the heating bend and preventing the exhaust gas from condensing and flowing back.

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