CN211091553U - Secondary heat exchange type tunnel furnace - Google Patents

Secondary heat exchange type tunnel furnace Download PDF

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Publication number
CN211091553U
CN211091553U CN201921179524.6U CN201921179524U CN211091553U CN 211091553 U CN211091553 U CN 211091553U CN 201921179524 U CN201921179524 U CN 201921179524U CN 211091553 U CN211091553 U CN 211091553U
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China
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heat exchange
chamber
air
box
tunnel furnace
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CN201921179524.6U
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Chinese (zh)
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付文兵
廖泽民
李承平
张书光
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Guangzhou Fuya Machinery Co ltd
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Guangzhou Fuya Machinery Co ltd
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Abstract

The utility model discloses a secondary heat exchange type tunnel furnace, which comprises a combustion chamber, a heat exchanger and a heat exchanger, wherein the combustion chamber is used for accommodating air to be heated; the combustor is communicated with the combustion chamber and is suitable for heating air to be heated in the combustion chamber; a first heat exchange chamber, wherein a first heat exchange tube communicated with the combustion chamber is arranged in the first heat exchange chamber, and the first heat exchange tube is suitable for heating air in the first heat exchange chamber; a second heat exchange chamber, wherein a second heat exchange tube communicated with the first heat exchange tube is arranged in the second heat exchange chamber, and the second heat exchange tube is suitable for heating air in the second heat exchange chamber; an exhaust pipe in communication with said second heat exchange tubes adapted to discharge heated gases from said combustion chamber after flowing through said first heat exchange tubes and said second heat exchange tubes; the secondary heat exchange type tunnel furnace has high fuel utilization rate, and can avoid food pollution caused by direct contact of combustion waste gas with food.

Description

Secondary heat exchange type tunnel furnace
Technical Field
The utility model relates to a tunnel furnace technical field especially relates to a secondary heat exchange formula tunnel furnace.
Background
Tunnel ovens (food processing) are tunnel-type mechanical devices that accomplish the baking of food products by conduction, convection, and radiation of heat. The oven body is generally very long, 6 meters at least and 60-80 meters long. The chamber is a narrow tunnel, typically 80cm to 140cm wide. A continuously operating conveyor system is located within the tunnel. When the food is baked, the food is moved relatively to the electric heating element or the direct-fired burning rod by the conveying chain plate, the steel belt or the net belt. Thereby completing the work of uniform baking and conveying. The tunnel furnace is classified into a flame tunnel furnace, a flame-proof tunnel furnace and a semi-flame-proof tunnel furnace according to whether flame enters the tunnel.
The flame-proof tunnel furnace mainly utilizes a burner to generate heat which directly enters a hearth in an air form and acts on products, but the following defects exist when the heat is used for heating food in the mode: firstly, the combustion waste gas directly contacts with food to cause food pollution, and if the fuel is diesel oil or liquefied gas, the food pollution is more serious; secondly, the surface color of the product baked by the combustion mode is dark and rough; and thirdly, in the whole furnace baking process, water generated in the hearth can drip to the ground, and cold and hot water can generate raw condensed water alternately because the water generated by combustion directly enters the hearth. The furnace body frame structure is corroded and rusted by moisture for a long time. The combustion system adopting the indirect hot air mode avoids food pollution caused by direct contact of combustion waste gas with food, but has the defects of low combustion efficiency, low fuel utilization rate of only 35-50 percent, simple structure and poor safety.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a secondary heat exchange type tunnel furnace which has high fuel utilization rate and can avoid the direct contact of combustion waste gas with food to cause food pollution.
The purpose of the utility model is realized by adopting the following technical scheme:
a secondary heat exchange type tunnel furnace comprises
A combustion chamber containing air to be heated;
the combustor is communicated with the combustion chamber and is suitable for heating air to be heated in the combustion chamber;
a first heat exchange chamber, wherein a first heat exchange tube communicated with the combustion chamber is arranged in the first heat exchange chamber, and the first heat exchange tube is suitable for heating air in the first heat exchange chamber;
a second heat exchange chamber, wherein a second heat exchange tube communicated with the first heat exchange tube is arranged in the second heat exchange chamber, and the second heat exchange tube is suitable for heating air in the second heat exchange chamber;
an exhaust pipe in communication with said second heat exchange tubes adapted to discharge heated gases from said combustion chamber after flowing through said first heat exchange tubes and said second heat exchange tubes;
the first air inlet pipe is arranged on the side surface of the first heat exchange chamber and communicated with the first heat exchange chamber;
a circulation fan installed at the first air inlet duct to be adapted to deliver external air into the first heat exchange chamber through the first air inlet duct;
a heating chamber for containing an article to be heated;
the air box is arranged in the heating chamber and communicated with the first heat exchange chamber, a plurality of exhaust holes are formed in the surface of the air box, and air heated by the first heat exchange chamber enters the heating chamber through the air box and is exhausted through the exhaust holes;
an inlet of the circulating pipe is communicated with the heating chamber, and an outlet of the circulating pipe is communicated with the first air inlet pipe, so that hot air in the heating chamber flows into the first air inlet pipe and enters the first heat exchange chamber along with external air to be heated;
and a first connection pipe respectively communicating with the circulation pipe and the second heat exchange chamber to allow heated air in the second heat exchange chamber to enter the wind box through the circulation pipe and the first heat exchange chamber and to be discharged out of the heating chamber through the plurality of exhaust holes.
Further, secondary heat exchange formula tunnel furnace still includes adjustment mechanism, adjustment mechanism includes dwang and baffle, the wind box is still including adjusting pipeline and last wind box, it sets up to adjust the pipeline last wind box upper end, it passes through to go up the wind box adjust the pipeline with first heat exchange chamber intercommunication, the baffle sets up in the adjust the pipeline, dwang one end is arranged in the adjust the pipeline and with the baffle rigid coupling, the baffle with be formed with the gas pocket that supplies to be passed through by heated air between the inner wall of adjust the pipeline, the dwang is suitable for to rotate and drive under the exogenic action the baffle rotates together, in order to adjust the size of gas pocket.
Further, the wind box still includes leeward box and intercommunication the governing pipeline with the second connecting pipe of leeward box, it sets up to go up the wind box the leeward box upper end, the exhaust hole sets up go up the wind box and leeward box one side in opposite directions, go up the wind box with form the accommodation space who is used for placing the article of waiting to heat down between the leeward box.
Furthermore, a plurality of second guide plates are arranged at the joint of the downdraft box and the second connecting pipeline.
Furthermore, a plurality of first guide plates are arranged at the joint of the upwind box and the adjusting pipeline, and the first guide plates are suitable for guiding the heated air entering the upwind box from the adjusting pipeline.
Further, a plurality of third guide plates are provided at the connection end of the circulation tube to the heating chamber.
Further, the secondary heat exchange type tunnel furnace further comprises a controller, a temperature sensor is arranged in the heating chamber, and the controller is electrically connected with the temperature sensor, the combustor and the circulating fan.
Further, an exhaust port is arranged on the first air inlet pipe.
Further, the exhaust pipe is provided with an exhaust fan.
Further, a second air inlet pipe is arranged on the side surface of the second heat exchange chamber, so that the outside air can enter the second heat exchange chamber.
Compared with the prior art, the beneficial effects of the utility model reside in that:
according to the heating device, the first heat exchange pipe communicated with the combustion chamber is arranged in the first heat exchange chamber, the second heat exchange pipe communicated with the first heat exchange pipe is arranged in the second heat exchange chamber, so that smoke generated after combustion of the combustion machine heats outside air through the first heat exchange pipe and the second heat exchange pipe, food in the heating chamber is heated through the outside air, and the situation that the smoke generated after combustion of the combustion machine directly contacts with food in the heating chamber to cause food pollution and the surface color of the food is dark and rough is avoided; meanwhile, the heat of the flue gas generated after combustion in the combustion chamber can be fully utilized by utilizing the mode of twice heat exchange, and the heating chamber is connected with the first air inlet pipe by utilizing the circulating pipe, so that the high-temperature air in the heating chamber can flow into the first heat exchange chamber again through the first air inlet pipe to be heated again, the energy consumption is reduced, and the utilization rate of the heat is improved.
Drawings
FIG. 1 is a schematic structural view of a secondary heat exchange type tunnel furnace of the present invention;
FIG. 2 is a top view of a secondary heat exchange type tunnel furnace according to the present invention;
FIG. 3 is a sectional view of a secondary heat exchange type tunnel furnace according to the present invention;
FIG. 4 is a schematic structural view of a secondary heat exchange type tunnel furnace wind box of the present invention;
fig. 5 is a schematic structural diagram of an air supply box of a secondary heat exchange type tunnel furnace of the present invention.
The figure is as follows: 10. a combustion chamber; 101. a combustion engine; 20. a first heat exchange chamber; 201. a first heat exchange tube; 30. a second heat exchange chamber; 301. a second heat exchange tube; 302. a second intake pipe; 40. an exhaust pipe; 401. an exhaust fan; 50. a first intake pipe; 501. a circulating fan; 502. an exhaust port; 60. a heating chamber; 601. a wind box; 6011. an upwind box; 60111. a first guide plate; 6012. a downdraft box; 60121. a second guide plate; 6013. a second connecting pipe; 6014. adjusting the pipeline; 70. a circulation pipe; 80. a first connecting pipe; 901. rotating the rod; 902. and a baffle plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the following description, various embodiments or technical features may be arbitrarily combined to form a new embodiment without conflict.
A secondary heat exchange type tunnel furnace as shown in fig. 1 to 5, a combustion chamber 10 for containing air to be heated;
a burner 101 in communication with the combustion chamber 10, the burner 101 being adapted to heat air to be heated in the combustion chamber 10;
a first heat exchange chamber 20, wherein a first heat exchange pipe 201 communicated with the combustion chamber 10 is installed in the first heat exchange chamber 20, and the first heat exchange pipe 201 is suitable for heating air in the first heat exchange chamber 20;
a second heat exchange chamber 30, wherein a second heat exchange tube 301 communicated with the first heat exchange tube 201 is installed in the second heat exchange chamber 30, and the second heat exchange tube 301 is suitable for heating air in the second heat exchange chamber 30;
an exhaust duct 40 communicating with the second heat exchanging tubes 301 for discharging the gas heated by the combustion chamber 10 after passing through the first heat exchanging tubes 201 and the second heat exchanging tubes 301;
a first air inlet duct 50 provided at a side of the first heat exchange chamber 20 and communicating with the first heat exchange chamber 20;
a circulation fan 501 installed at the first intake duct 50 to be adapted to deliver the external air into the first heat exchange chamber 20 through the first intake duct 50;
a heating chamber 60, the heating chamber 60 being used for accommodating an object to be heated;
the air box 601 is installed in the heating chamber 60 and communicated with the first heat exchange chamber 20, a plurality of exhaust holes are formed in the surface of the air box 601, and air heated by the first heat exchange chamber 20 enters the heating chamber 60 through the air box 601 and is exhausted through the plurality of exhaust holes;
a circulation pipe 70, an inlet of the circulation pipe 70 is communicated with the heating chamber 60, and an outlet of the circulation pipe 70 is communicated with the first air inlet pipe 50, so that hot air in the heating chamber 60 flows into the first air inlet pipe 50 and enters the first heat exchange chamber 20 along with external air to be heated;
the first connection pipe 80 is in communication with the circulation pipe 70 and the second heat exchange chamber 30, respectively, to allow the heated air in the second heat exchange chamber 30 to enter the wind box 601 through the circulation pipe 70 and the first heat exchange chamber 20 and to be discharged out of the heating chamber 60 through a plurality of exhaust holes.
In operation, the burner 101 heats the air in the combustion chamber 10 and generates flue gas, which flows into the first heat exchange tubes 201 to heat the air in the first heat exchange chamber 20, the flue gas will then flow into the second heat exchange tubes 301 via the first heat exchange tubes 201 to heat the air in the second heat exchange chamber 30, at this time, the circulating fan 501 will convey the outside air and the heated air in the second heat exchange chamber 30 to the first heat exchange chamber 20, the first heat exchanging tubes 201 heat the air entering the first heat exchanging chamber 20 to form high temperature hot air, which is delivered into the heating chamber 60 by the wind box 601 to heat the food to be heated placed in the heating chamber 60, and at this time, the partially used high temperature hot gas flows into the first intake pipe 50 through the circulation pipe 70, and flows into the first heat exchange chamber 20 again for reheating utilization under the action of the circulating fan 501. In the present application, the side of the combustion chamber 10 is provided with an air inlet for the external air to enter.
According to the food heating device, the first heat exchange tube 201 communicated with the combustion chamber 10 is arranged in the first heat exchange chamber 20, the second heat exchange tube 301 communicated with the first heat exchange tube 201 is arranged in the second heat exchange chamber 30, so that smoke generated after combustion of the combustor 101 heats outside air through the first heat exchange tube 201 and the second heat exchange tube 301, food in the heating chamber 60 is heated through the outside air, the situation that the smoke generated after combustion of the combustor 101 directly contacts with food in the heating chamber 60 to cause food pollution is avoided, and the color and luster of the surface of the food are dark and rough; meanwhile, the heat of the flue gas generated after combustion in the combustion chamber 10 can be fully utilized by utilizing the two heat exchange modes, and the heating chamber 60 is connected with the first air inlet pipe 50 by utilizing the circulating pipe 70, so that the high-temperature air in the heating chamber 60 flows into the first heat exchange chamber 20 again through the first air inlet pipe 50 to be heated again, the energy consumption is reduced, and the utilization rate of the heat is improved.
Specifically, the secondary heat exchange type tunnel furnace further comprises an adjusting mechanism, the adjusting mechanism comprises a rotating rod 901 and a baffle 902, the air box 601 further comprises an adjusting pipeline 6014 and an upper air box 6011, the adjusting pipeline 6014 is arranged at the upper end of the upper air box 6011, the upper air box 6011 is communicated with the first heat exchange chamber 20 through the adjusting pipeline 6014, the baffle 902 is arranged in the adjusting pipeline 6014, one end of the rotating rod 901 is arranged in the adjusting pipeline 6014 and fixedly connected with the baffle 902, an air hole for heated air to pass through is formed between the baffle 902 and the inner wall of the adjusting pipeline 6014, the rotating rod 901 is suitable for rotating under the action of external force and driving the baffle 902 to rotate together so as to adjust the size of the air hole, during operation, the rotating rod 901 is rotated to adjust the size of the air hole so as to adjust the flow rate of hot air entering the adjusting pipeline 6014 through the air hole, thereby adjusting the temperature in the heating chamber 60, so as to avoid the situation that food in the heating chamber, the hot air flows into the windward box 6011 through the air holes, and enters the heating chamber 60 through the air discharge holes formed in the surface of the windward box 6011, thereby heating the food in the heating chamber 60.
More specifically, the wind box 601 further includes a leeward box 6012 and a second connecting pipe 6013 communicating the adjusting pipe 6014 with the leeward box 6012, the windward box 6011 is disposed at an upper end of the leeward box 6012, the exhaust holes are disposed at opposite sides of the windward box 6011 and the leeward box 6012, and an accommodating space for placing an article to be heated is formed between the windward box 6011 and the leeward box 6012 to heat two sides of the food synchronously, so that the food is heated uniformly, and the situation that a part is not cooked and the other part is cooked is avoided. In operation, a portion of the hot air enters the windbox 6011 through the adjusting duct 6014, and enters the heating chamber 60 through the exhaust holes formed in the surface of the windbox 6011, and the rest of the hot air enters the leeward box 6012 through the second connecting duct 6013, and enters the heating chamber 60 through the exhaust holes formed in the surface of the leeward box 6012, so as to heat the food from both sides.
Specifically, a plurality of second guide plates 60121 are disposed at a joint between the leeward box 6012 and the second connecting pipe 6013, so that hot air entering from the second connecting pipe 6013 is uniformly introduced into the leeward box 6012, and a lack of air flow in the exhaust hole part is avoided.
A plurality of first guide plates 60111 are arranged at the connection part of the windward box 6011 and the adjusting pipeline 6014, and the first guide plates 60111 are adapted to guide the heated air entering the windward box 6011 from the adjusting pipeline 6014, so that the heated air uniformly flows into the windward box 6011 and is discharged through the exhaust holes, and thus, insufficient air flow of the exhaust holes is avoided, and the surface of the food is uniformly heated during heating.
The connection end of the circulation duct 70 to the heating chamber 60 is provided with a plurality of third guide plates to facilitate the uniform introduction of the hot air.
Specifically, secondary heat exchange formula tunnel furnace still includes the controller, is provided with temperature sensor in the heating chamber 60, and the controller is connected with temperature sensor, combustor 101 and circulating fan 501 electricity, and temperature sensor is thermocouple formula temperature sensor in this application, and is provided with two corresponding windward box 6011 and leeward box 6012 position to detect the temperature in the heating chamber 60, and with temperature signal real-time transmission to the controller in, so that the controller is according to the start-up and the closing of heating chamber 60 temperature control combustor 101 and circulating fan 501. The existing products such as RC series axial flow type hot air circulating fan 501 can be adopted as the combustor 101 and the circulating fan 501
The first intake duct 50 is provided with an exhaust port 502 to facilitate a part of the hot air to be exhausted.
The exhaust duct 40 is provided with an exhaust fan 401 to facilitate the extraction of the fumes.
The second heat exchange chamber 30 is provided at a side thereof with a second air inlet pipe 302 for allowing the external air to enter the second heat exchange chamber 30.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims (10)

1. A secondary heat exchange type tunnel furnace is characterized in that: comprises that
A combustion chamber containing air to be heated;
the combustor is communicated with the combustion chamber and is suitable for heating air to be heated in the combustion chamber;
a first heat exchange chamber, wherein a first heat exchange tube communicated with the combustion chamber is arranged in the first heat exchange chamber, and the first heat exchange tube is suitable for heating air in the first heat exchange chamber;
a second heat exchange chamber, wherein a second heat exchange tube communicated with the first heat exchange tube is arranged in the second heat exchange chamber, and the second heat exchange tube is suitable for heating air in the second heat exchange chamber;
an exhaust pipe in communication with said second heat exchange tubes adapted to discharge heated gases from said combustion chamber after flowing through said first heat exchange tubes and said second heat exchange tubes;
the first air inlet pipe is arranged on the side surface of the first heat exchange chamber and communicated with the first heat exchange chamber;
a circulation fan installed at the first air inlet duct to be adapted to deliver external air into the first heat exchange chamber through the first air inlet duct;
a heating chamber for containing an article to be heated;
the air box is arranged in the heating chamber and communicated with the first heat exchange chamber, a plurality of exhaust holes are formed in the surface of the air box, and air heated by the first heat exchange chamber enters the heating chamber through the air box and is exhausted through the exhaust holes;
an inlet of the circulating pipe is communicated with the heating chamber, and an outlet of the circulating pipe is communicated with the first air inlet pipe, so that hot air in the heating chamber flows into the first air inlet pipe and enters the first heat exchange chamber along with external air to be heated;
and a first connection pipe respectively communicating with the circulation pipe and the second heat exchange chamber to allow heated air in the second heat exchange chamber to enter the wind box through the circulation pipe and the first heat exchange chamber and to be discharged out of the heating chamber through the plurality of exhaust holes.
2. A secondary heat exchange tunnel furnace according to claim 1, wherein: still include adjustment mechanism, adjustment mechanism includes dwang and baffle, the wind box is still including adjusting pipeline and last wind box, it sets up to adjust the pipeline last wind box upper end, it passes through to go up the wind box adjust the pipeline with first heat exchange chamber intercommunication, the baffle sets up in the adjust the pipeline, dwang one end is arranged in the adjust the pipeline and with the baffle rigid coupling, the baffle with be formed with the gas pocket that supplies to be passed through by heated air between the inner wall of adjust the pipeline, the dwang is suitable for to rotate and drive under the exogenic action the baffle rotates together, with the regulation the size of gas pocket.
3. A secondary heat exchange tunnel furnace according to claim 2, wherein: the wind box still includes leeward box and intercommunication the governing pipeline with the second connecting pipe of leeward box, the box setting of going up the wind is in leeward box upper end, the exhaust hole sets up go up the wind box and leeward box one side in opposite directions, go up the wind box and form the accommodation space that is used for placing the article of waiting to heat down between the box of going up the wind.
4. A secondary heat exchange tunnel furnace according to claim 3, wherein: and a plurality of second guide plates are arranged at the joint of the downdraft box and the second connecting pipeline.
5. A secondary heat exchange tunnel furnace according to claim 2, wherein: the connection part of the upwind box and the adjusting pipeline is provided with a plurality of first guide plates, and the first guide plates are suitable for guiding heated air entering the upwind box from the adjusting pipeline.
6. A secondary heat exchange tunnel furnace according to claim 1, wherein: and a plurality of third guide plates are arranged at the connecting end of the circulating pipe and the heating chamber.
7. A secondary heat exchange tunnel furnace according to claim 1, wherein: the heating chamber is internally provided with a temperature sensor, and the controller is electrically connected with the temperature sensor, the burner and the circulating fan.
8. A secondary heat exchange tunnel furnace according to claim 1, wherein: an exhaust port is arranged on the first air inlet pipe.
9. A secondary heat exchange tunnel furnace according to claim 1, wherein: the exhaust pipe is provided with an exhaust fan.
10. A secondary heat exchange tunnel furnace according to claim 1, wherein: and a second air inlet pipe is arranged on the side surface of the second heat exchange chamber, so that the outside air can enter the second heat exchange chamber.
CN201921179524.6U 2019-07-24 2019-07-24 Secondary heat exchange type tunnel furnace Active CN211091553U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921179524.6U CN211091553U (en) 2019-07-24 2019-07-24 Secondary heat exchange type tunnel furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921179524.6U CN211091553U (en) 2019-07-24 2019-07-24 Secondary heat exchange type tunnel furnace

Publications (1)

Publication Number Publication Date
CN211091553U true CN211091553U (en) 2020-07-28

Family

ID=71715048

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921179524.6U Active CN211091553U (en) 2019-07-24 2019-07-24 Secondary heat exchange type tunnel furnace

Country Status (1)

Country Link
CN (1) CN211091553U (en)

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