CN216255010U

CN216255010U - Hot air circulation rotary furnace

Info

Publication number: CN216255010U
Application number: CN202122406897.6U
Authority: CN
Inventors: 张党生
Original assignee: Chengdu Dajia Hydraulic Machinery Co ltd
Current assignee: Chengdu Dajia Hydraulic Machinery Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-04-12
Anticipated expiration: 2031-09-30

Abstract

The utility model provides a hot air circulation rotary furnace with high heat conversion efficiency to reduce energy consumption, and relates to the technical field of rotary furnaces. The hot air circulation rotary furnace comprises a burner, a circulating fan, a heat exchanger and a furnace body; a furnace chamber is arranged in the furnace body, the burner is connected with the lower end of a heat exchange pipe, the upper end of the heat exchange pipe is connected with a smoke exhaust pipe arranged at the upper end of a heat exchanger shell, a cooling port at the upper end of the heat exchanger shell is connected with one end of an exhaust pipe, and a cooling port at the lower end of the heat exchanger shell is connected with an air inlet pipe; the circulating fan is arranged on the exhaust pipe or the air inlet pipe so as to pump air to flow from the cooling port at the upper end of the heat exchanger shell to the cooling port at the lower end of the heat exchanger shell. The utility model improves the energy utilization rate.

Description

Hot air circulation rotary furnace

Technical Field

The utility model relates to the technical field of rotary furnaces, in particular to a hot air circulation rotary furnace.

Background

The hot air circulation rotary furnace uses high-temperature flue gas as a carrier, heats air through a heat exchanger to make the air reach the temperature required by baking, and then uses the air to bake food on a grill. The hot air circulation rotary furnace is widely used for making French bread, toast, moon cake, cake and other products due to the advantages of high baking capacity and good baking universality.

Because the air is a heat transfer carrier between high-temperature flue gas generated by a burner and food, the heat transfer efficiency between the air and the high-temperature flue gas and between the air and the food has an important influence on the heat conversion efficiency of the hot air circulation rotary furnace, and the air circulation mode of the existing hot air circulation rotary furnace has the problem that the heat exchange efficiency between the air and a heat exchanger and between the air and the food is not high enough.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a hot air circulation rotary furnace with high heat conversion efficiency so as to reduce energy consumption.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the hot air circulation rotary furnace comprises a burner, a circulating fan, a heat exchanger and a furnace body; the furnace body is internally provided with a furnace chamber, the heat exchanger comprises a heat exchanger shell and a heat exchange pipe arranged in the heat exchanger shell, the burner is connected with the lower end of the heat exchange pipe, the upper end of the heat exchange pipe is connected with a smoke exhaust pipe arranged at the upper end of the heat exchanger shell, the upper part of the furnace chamber is provided with an exhaust pipe, the lower part of the furnace chamber is provided with an air inlet pipe, and the side wall of the furnace chamber is provided with a spirally-rising diversion through groove;

the cooling port at the upper end of the heat exchanger shell is connected with one end of the exhaust pipe, and the cooling port at the lower end of the heat exchanger shell is connected with the air inlet pipe;

the circulating fan is arranged on the exhaust pipe or the air inlet pipe so as to pump air to flow from the cooling port at the upper end of the heat exchanger shell to the cooling port at the lower end of the heat exchanger shell.

Furthermore, an air inlet of the circulating fan is connected with one end of the exhaust pipe, and an air outlet of the circulating fan is connected with a cooling port at the upper end of the heat exchanger shell.

Further, the heat exchange tube is arranged inside the heat exchanger shell in a winding way.

Furthermore, a partition board is arranged in the furnace chamber, the furnace chamber is divided into a baking chamber and a hot air buffer chamber which are arranged up and down by the partition board, and a plurality of hot air channels for dispersing air in the hot air buffer chamber and leading the air into the baking chamber are arranged on the partition board.

Furthermore, a plurality of flake-shaped ceramic plates are arranged on the partition plate, and gaps among the ceramic plates form the hot air channel.

The utility model has the beneficial effects that: when the hot air circulation rotary furnace works, the air flow direction of low-temperature air is from top to bottom in the heat exchanger, the flow direction of hot flue gas is from bottom to top, the air and the hot flue gas are firstly contacted with the hot flue gas with lower temperature in the heat exchange process and are finally contacted with the hot flue gas with the highest temperature of the outlet accessory of the burner, the air can obtain more heat, and in the furnace cavity, because the diversion groove is arranged, the high-temperature air can spirally rise along the diversion groove, so that the contact between the high-temperature air and food of each layer of the rotary grill can be more sufficient, the heat exchange efficiency between the air and the food can be improved, and the food between each layer can be heated more uniformly. Therefore, the utility model improves the heat conversion efficiency of the hot air circulation rotary furnace and improves the energy utilization rate.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the furnace chamber of the present invention;

FIG. 3 is an enlarged view at A of FIG. 2;

FIG. 4 is a schematic view of a hot gas path formed by ceramic plates arranged in a fish scale shape;

shown in the figure: the device comprises a burner 1, a circulating fan 2, a furnace body 4, an exhaust pipe 5, an air inlet pipe 6, an air flow direction 7, a hot flue gas flow direction 8, a heat exchanger shell 31, a heat exchange pipe 32, a smoke exhaust pipe 33, a furnace chamber 41, a diversion trench 42, a grill 43, a partition plate 44, a baking chamber 431, a hot gas buffer chamber 432, a hot gas channel 441 and a ceramic plate 442.

Detailed Description

The utility model is further illustrated with reference to the following figures and examples.

As shown in fig. 1 to 3, the hot air circulation rotary furnace of the present invention includes a burner 1, a circulation fan 2, a heat exchanger, and a furnace body 4. The furnace body 4 is internally provided with a furnace chamber 41, the heat exchanger comprises a heat exchanger shell 31 and a heat exchange pipe 32 arranged in the heat exchanger shell 31, the burner 1 is connected with the lower end of the heat exchange pipe 32, and the upper end of the heat exchange pipe 32 is connected with a smoke exhaust pipe 33 arranged at the upper end of the heat exchanger shell 31. An exhaust pipe 5 for exhausting air outwards is arranged at the upper part of the furnace chamber 41, an air inlet pipe 6 is arranged at the lower part of the furnace chamber 41, and a guide groove 42 for spirally rising is arranged on the side wall of the furnace chamber 41. The cooling port at the upper end of the heat exchanger case 31 is connected to one end of the exhaust pipe 5, and the cooling port at the lower end of the heat exchanger case 31 is connected to the intake pipe 6. The circulation fan 2 is provided on the exhaust duct 5 or the intake duct 6 to draw air from the cooling port at the upper end of the heat exchanger case 31 to the cooling port at the lower end of the heat exchanger case 31.

When the hot air circulation rotary furnace is used, the combustor 1 and the circulating fan 2 are started, the combustor 1 combusts gas to generate high-temperature hot flue gas, and the warm flue gas flows upwards along the heat exchange pipe 32 and is discharged from the smoke discharge pipe 33 at the upper end. The circulating fan 2 draws the air in the furnace chamber 41 into the heat exchanger from the cooling port at the upper end of the heat exchanger shell 31, and finally discharges the air from the cooling port at the lower end of the heat exchanger shell 31, and the air exchanges heat with the high-temperature flue gas in the heat exchange tube 32 when passing through the heat exchanger to form high-temperature air. The discharged high-temperature air enters the furnace chamber 41 through the air inlet pipe 6 and spirally rises along the flow guide groove 42, the high-temperature air is contacted with food in the rising process, heat is transferred to the food, the temperature is gradually reduced, and finally the high-temperature air enters the heat exchanger again under the action of the fan to perform heat exchange circulation. According to the hot air circulation rotary furnace, the air flow direction 7 of low-temperature air flowing out of the furnace chamber 41 is from top to bottom in the heat exchanger, the hot flue gas flow direction 8 in the heat exchanger shell 31 is from bottom to top, the air and the hot flue gas are firstly contacted with the hot flue gas with lower temperature in the heat exchange process and are finally contacted with the hot flue gas with the highest temperature at the outlet accessory of the combustor 1, the air can obtain more heat, compared with a circulation mode of the air from bottom to top, the mode can improve the exchange rate between the air and the hot flue gas, the hot flue gas flow direction 8 is from bottom to top, smoke discharge is smooth, and the combustion efficiency of the combustor 1 can be ensured. In the oven cavity, because the flow guide groove 42 is arranged, the high-temperature air can spirally rise along the flow guide groove 42, so that the high-temperature air can be more fully contacted with the food on each layer of the rotary grill 43, the heat exchange efficiency between the air and the food can be improved, and the food between each layer can be heated more uniformly.

In the embodiment of the present invention, in order to facilitate the arrangement of the circulation fan 2, the air inlet of the circulation fan 2 is connected to one end of the exhaust pipe 5, and the air outlet of the circulation fan 2 is connected to the cooling port at the upper end of the heat exchanger housing 31. The circulating fan 2 is arranged on the exhaust pipe 5, and the circulating fan 2 is contacted with air with lower temperature, so that the requirement on the fan is relatively lower.

In order to further improve the heat exchange efficiency, the heat exchange tubes 32 are arranged in a winding manner inside the heat exchanger case 31.

In the present invention, the cavity 41 is provided with a partition 44, the cavity 41 is partitioned into a baking chamber 431 and a hot air buffer chamber 432 by the partition 44, and the hot air buffer chamber 432 is provided with a plurality of hot air passages 441 for dispersing air in the hot air buffer chamber 432 and introducing the air into the baking chamber 431. It is understood that one end of the hot gas channel 441 communicates with the roasting chamber 431 and the other end communicates with the hot gas buffer chamber 432. The hot gas channels 441 are arranged on the partition plate 44 in an evenly distributed manner as much as possible. After entering the hot gas buffer chamber 432, the high-temperature air enters the baking chamber 431 through each hot gas channel 441, and the high-temperature air is introduced into the baking chamber 431 and is distributed more uniformly, so that the heat exchange efficiency between the air and the food can be further improved.

The hot gas path 441 may be punched directly in the separator 44. As shown in fig. 4, in the present invention, a plurality of ceramic plates 442 are arranged in a fish scale shape on the partition 44, and the hot gas path 441 is formed by the gaps between the ceramic plates 442. So that the hot air can more smoothly enter the hot air path 441.

Claims

1. The hot air circulation rotary furnace comprises a burner (1), a circulating fan (2), a heat exchanger and a furnace body (4); be equipped with furnace chamber (41) in furnace body (4), heat exchanger includes heat exchanger casing (31) and sets up hot exchange pipe (32) in heat exchanger casing (31), combustor (1) is connected with the lower extreme of hot exchange pipe (32), the upper end of hot exchange pipe (32) is connected with smoke pipe (33) of setting in heat exchanger casing (31) upper end, its characterized in that: an exhaust pipe (5) is arranged at the upper part of the furnace chamber (41), an air inlet pipe (6) is arranged at the lower part of the furnace chamber (41), and a spirally-rising diversion through groove (42) is arranged on the side wall of the furnace chamber (41);

a cooling port at the upper end of the heat exchanger shell (31) is connected with one end of the exhaust pipe (5), and a cooling port at the lower end of the heat exchanger shell (31) is connected with the air inlet pipe (6);

the circulating fan (2) is arranged on the exhaust pipe (5) or the air inlet pipe (6) to pump air to flow from the cooling port at the upper end of the heat exchanger shell (31) to the cooling port at the lower end of the heat exchanger shell (31).

2. The hot air circulating rotary furnace according to claim 1, wherein: the air inlet of the circulating fan (2) is connected with one end of the exhaust pipe (5), and the air outlet of the circulating fan (2) is connected with the cooling port at the upper end of the heat exchanger shell (31).

3. The hot air circulating rotary furnace according to claim 1, wherein: the heat exchange tubes (32) are arranged in a winding manner in the heat exchanger shell (31).

4. The hot air circulating rotary furnace according to claim 1, wherein: the oven cavity (41) is internally provided with a partition plate (44), the oven cavity (41) is divided into a baking chamber (431) and a hot air buffer chamber (432) by the partition plate (44), the baking chamber and the hot air buffer chamber are vertically arranged, and a plurality of hot air channels (441) for dispersing air in the hot air buffer chamber (432) and introducing the air into the baking chamber (431) are arranged on the partition plate (44).

5. The hot air circulating rotary furnace according to claim 4, wherein: a plurality of fish-scale-shaped ceramic plates (442) are arranged on the partition plate (44), and gaps between the ceramic plates (442) form the hot air channel (441).