Circulating fan for curing oven

Abstract

The utility model discloses a circulating fan for a curing oven, which comprises the curing oven, a drainage fan and a backflow fan are connected on the curing oven, a circulating air bellow is connected between an input pipe of the drainage fan and an output pipe of the backflow fan, and a heat insulation plate is connected in the circulating air bellow. The circulating air box is divided into an upper cavity and a lower cavity by a heat insulation plate, the input pipe is communicated with the upper cavity, the output pipe is communicated with the lower cavity, the outer side of the upper cavity is connected with an air inlet pipe, the outer side of the lower cavity is connected with an air exhaust pipe, the heat insulation plate is connected with a ventilation pipe, and the upper cavity is communicated with the lower cavity through the ventilation pipe. The curing oven has the advantages that three states, namely constant temperature, heating and cooling, of the curing oven can be realized through the circulating air bellow, so that the temperature in the curing oven can be better adjusted, and the curing effect of a workpiece is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of curing furnaces, in particular to a circulating fan for a curing furnace. Background Art

[0002] Existing circulation fans generally adopt induced draft fans and return fans. The induced draft fan draws external air into the curing furnace, and then the return fan discharges the hot air in the curing furnace, thereby forming circulating wind in the curing furnace. In order to prevent heat loss in the curing furnace, the hot air outlet of the return fan is generally set at the air inlet of the induced draft fan. For example, patent number CN202221842218.8 is a closed drying and curing furnace with a built-in circulation fan. The curing furnace adopts a circulation fan of this structure. Although it realizes the hot air circulation inside the furnace body and reduces heat loss, the circulation fan can only ensure the constant temperature inside the furnace body and cannot adjust the temperature inside the curing furnace. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a circulating fan for a curing furnace.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A circulating fan for a curing furnace comprises a curing furnace, an induced draft fan and a return flow fan connected to the curing furnace, a circulating air box connected between an input pipe of the induced draft fan and an output pipe of the return flow fan, a heat insulation board connected inside the circulating air box, the heat insulation board divides the circulating air box into an upper cavity and a lower cavity, the input pipe communicates with the upper cavity, the output pipe communicates with the lower cavity, an air inlet pipe is connected to the outside of the upper cavity, an exhaust pipe is connected to the outside of the lower cavity, a ventilation pipe is connected to the insulation board, and the upper cavity and the lower cavity are communicated through the ventilation pipe.

[0006] Preferably, two layers of filter screens are connected in the lower cavity, a filter cavity is formed between the two layers of filter screens, and the output pipe is connected to one side of the filter cavity.

[0007] Preferably, a first solenoid valve is connected to the air inlet pipe, a second solenoid valve is connected to the air outlet pipe, and a third solenoid valve is connected to the ventilation pipe.

[0008] Preferably, a heating plate is connected in the upper cavity.

[0009] The advantages of the present invention are as follows: the circulating fan for a curing furnace provided by the present invention can realize three states of the curing furnace through the circulating wind box. When maintaining a constant temperature state, the circulating wind box can filter the hot air discharged by the return fan and then re-introduce it into the curing furnace, thereby reducing heat loss and maintaining a constant temperature state in the curing furnace;

[0010] In addition, the air in the circulating air box is heated by the heating plate, so that the heated air enters the curing furnace, further increasing the temperature in the curing furnace;

[0011] The hot air extracted by the return fan is discharged to the outside through the circulating air box, and then the induced draft fan draws the outside air into the curing furnace, thereby cooling the curing furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the principle structure of a circulating fan for a curing furnace provided by the utility model;

[0013] Figure 2 It is a schematic diagram of the internal structure of the circulating bellows. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0016] like Figure 1 As shown, the utility model provides a circulation fan for a curing furnace, which includes a curing furnace 1, and a drainage fan 2 and a return fan 3 are connected to the curing furnace 1.

[0017] A circulation air box 4 is connected between the input pipe 2.1 of the induced draft fan 2 and the output pipe 3.1 of the return flow fan 3. The circulation air box 4 is arranged on the upper side of the curing furnace 1. A heat insulation board 6 is connected inside the circulation air box 4. The heat insulation board 6 divides the circulation air box 4 into an upper cavity 7 and a lower cavity 8. The output pipe of the induced draft fan 2 is connected to the interior of the curing furnace 1, the input pipe 2.1 of the induced draft fan 2 is connected to the upper cavity 7, the output pipe 3.1 of the return flow fan 3 is connected to the lower cavity 8, and the input pipe of the return flow fan 3 is connected to the interior of the curing furnace 1. The return flow fan 3 draws air from the curing furnace 1 into the circulation air box 4, and the induced draft fan 2 draws air from the circulation air box 4 into the curing furnace 1, thereby forming a circulating flow of hot air.

[0018] like Figure 2 As shown, two layers of filter screens 8.1 are connected in the lower cavity 8, a filter cavity is formed between the two layers of filter screens 8.1, and the output pipe 3.1 is connected to one side of the filter cavity. The air in the curing furnace 1 extracted by the return fan 3 will contain dust, which can be filtered through the two filter screens 8.1.

[0019] An air inlet pipe 9 is connected to the outside of the upper cavity 7, and a first solenoid valve 9.1 is connected to the air inlet pipe 9. An exhaust pipe 10 is connected to the outside of the lower cavity 8, and a second solenoid valve 101 is connected to the exhaust pipe 10. A ventilation pipe 11 is connected to the insulation board 6, and a third solenoid valve 111 is connected to the ventilation pipe 11. The upper cavity 7 and the lower cavity 8 are connected through the ventilation pipe 11.

[0020] A heating plate 7.1 is connected to the upper cavity 7, and the air in the upper cavity 7 can be heated by the heating plate 7.1. The heated air enters the curing furnace 1, and the internal temperature of the curing furnace 1 can be increased.

[0021] The device can realize three states of the curing furnace 1, namely constant temperature, heating and cooling, through the circulating bellows 4, so as to better adjust the temperature inside the curing furnace and ensure the curing effect of the workpiece.

[0022] When maintaining a constant temperature, by closing the second solenoid valve 101 and the first solenoid valve 9.1 and opening the third solenoid valve 111, the circulating air box 4 can filter the hot air extracted from the curing oven 1 by the return blower 3 and then reintroduce it into the curing oven 1, so as to maintain a constant temperature in the curing oven 1.

[0023] When the temperature in the curing oven 1 is increased, the second solenoid valve 101 and the first solenoid valve 9.1 are closed, and the third solenoid valve 111 is opened. In addition, the air in the circulating air box 4 is heated by the heating plate 7.1, so that the heated air enters the curing oven 1, further increasing the temperature in the curing oven 1.

[0024] When cooling the curing furnace 1, the third solenoid valve 111 is closed, and the second solenoid valve 101 and the first solenoid valve 9.1 are opened. The hot air extracted by the return fan 3 will be discharged to the outside, and then the induced draft fan 2 will draw the outside air into the curing furnace 1, thereby cooling the curing furnace 1 and the workpiece, making it easier for the staff to take it.

[0025] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A circulation fan for a curing furnace, comprising a curing furnace (1), a draught fan (2) and a return fan (3) connected to the curing furnace (1), characterized in that: A circulation air box (4) is connected between the input pipe (2.1) of the induced draft fan (2) and the output pipe (3.1) of the return flow fan (3), a heat insulation board (6) is connected inside the circulation air box (4), and the heat insulation board (6) divides the circulation air box (4) into an upper cavity (7) and a lower cavity (8), the input pipe (2.1) is connected to the upper cavity (7), the output pipe (3.1) is connected to the lower cavity (8), an air inlet pipe (9) is connected to the outside of the upper cavity (7), an air exhaust pipe (10) is connected to the outside of the lower cavity (8), a ventilation pipe (11) is connected to the heat insulation board (6), and the upper cavity (7) and the lower cavity (8) are connected via the ventilation pipe (11).

2. The circulating fan for a curing furnace according to claim 1, characterized in that: Two layers of filter screens (8.1) are connected in the lower cavity (8), a filter cavity is formed between the two layers of filter screens (8.1), and the output pipe (3.1) is connected to one side of the filter cavity.

3. The circulating fan for a curing furnace according to claim 1, characterized in that: The air inlet pipe (9) is connected to a first solenoid valve (9.1), the air outlet pipe (10) is connected to a second solenoid valve (101), and the ventilation pipe (11) is connected to a third solenoid valve (111).

4. The circulating fan for a curing furnace according to claim 1, characterized in that: A heating plate (7.1) is connected inside the upper cavity (7).

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