JP6983403B2 - Hot air generator and dryer - Google Patents

Description

The present invention relates to a hot air generator and a dryer equipped with the same.

Conventionally, a dryer for drying an object to be dried such as grains, vegetables, and raw okara has been proposed. As such a dryer, a mixture obtained by mixing hot air generated by igniting a burner in a combustion furnace and outside air guided to the outer periphery of the combustion furnace is sent to a drying chamber as a drying gas. A method of drying an object to be dried in a drying chamber has been proposed (see, for example, Patent Document 1). When a burner is used as a heat source, it is necessary to adjust the pressure inside the combustion furnace to a pressure suitable for ignition of the burner.

JP-A-7-324864

As described above, as a configuration for sending the drying gas to the drying chamber, there is a configuration in which an attraction fan provided on the downstream side of the drying chamber is operated to attract the drying gas to the drying chamber. Can adjust the pressure inside the combustion furnace by controlling the rotation amount of the attraction fan.

However, if the rotation amount of the induction fan is adjusted to adjust the pressure inside the combustion furnace, the air volume of the drying gas flowing in the drying chamber also fluctuates, and the pressure inside the combustion furnace and the air volume of the drying gas are separated. Cannot be adjusted.

An object of the present invention is to provide a hot air generator capable of adjusting the internal pressure of a combustion furnace without affecting the air volume, and a dryer equipped with the hot air generator.

The hot air generator of the present invention includes a combustion furnace for generating hot air by a burner and a baffle plate provided facing the hot air outlet of the combustion furnace, and the hot air blown out from the hot air outlet. Flows through the gap between the combustion furnace and the baffle plate, and the baffle plate is provided so as to be movable along a predetermined direction in a direction approaching the hot air outlet and a direction away from the hot air outlet. It is characterized by being.

According to the hot air generator of the present invention, the baffle plate is provided so as to be movable along a predetermined direction. Therefore, when the baffle plate is moved in a direction approaching the hot air outlet, the gap between the baffle plate and the combustion chamber becomes small. Therefore, the pressure in the combustion chamber can be increased, and when the pressure is moved in the direction away from the hot air outlet, the gap becomes large and the pressure in the combustion chamber can be reduced. Therefore, the pressure in the combustion chamber can be adjusted to a pressure suitable for ignition of the burner without changing the air volume of the drying gas flowing through the dryer.

The schematic front view of the dryer which concerns on embodiment of this invention. The vertical sectional view of the hot air generator provided in the dryer shown in FIG. 1. FIG. 2 is a sectional view taken along line III-III.

Hereinafter, the dryer according to the embodiment of the present invention will be described with reference to the accompanying drawings. With reference to FIG. 1, the dryer 1 of the present embodiment has a hot air generator 2 for generating a drying gas, a drying furnace 3 connected to the hot air generator 2, and a duct 4 extending from the drying furnace 3. And an attraction fan (not shown) provided in the duct 4, the drying gas generated by the hot air generator 2 is drawn into the drying furnace 3 by the attraction fan, and the drying furnace 3 is used to draw grains and raw oak. It is configured to dry an object to be dried (not shown).

With reference to FIGS. 2 and 3, the hot air generator 2 includes a cylindrical combustion furnace 5 extending in the front-rear direction (horizontal direction: predetermined direction) D1, a frame body 6 for accommodating the combustion furnace 5, and a frame body. It has a ventilation box 7 mounted on the 6 and a mixing chamber R1 is provided in front of the combustion furnace 5. Inside the combustion furnace 5, a combustion chamber 51 extending in the front-rear direction D1 is provided. A hot air outlet 52 is provided in front of the combustion chamber 51 (front end of the combustion furnace 5), and the combustion chamber 51 communicates with the mixing chamber R1 via the hot air outlet 52. A burner insertion port 53 is provided behind the combustion chamber 51, and a burner (not shown) is inserted and attached therein. When the burner ignites, hot air (combustion gas) W1 is generated, and the hot air W1 thus generated in the combustion furnace 5 is blown from the combustion chamber 51 to the mixing chamber R1 via the hot air outlet 52.

An outside air supply path R2 having an annular vertical cross section is provided on the outer periphery of the combustion furnace 5. A spiral outside air introduction path R3 is formed in the ventilation box 7, and one end of the outside air introduction path R3 communicates with the rear portion of the outside air supply path R2. The outside air W2 is introduced into the outside air introduction path R3 by the action of the attraction fan, and the outside air W2 introduced in this way flows into the mixing chamber R1 through the outside air supply path R2 and mixes with the hot air W1 generated in the combustion furnace 5. Then, it becomes the air-fuel mixture W3 as a drying gas. By mixing the high-temperature hot air W1 generated in the combustion furnace 5 with the outside air W2 at room temperature in this way, an air-fuel mixture (drying gas) W3 having a temperature suitable for drying the object to be dried can be generated.

Further, the dryer 1 is further provided with an adjusting tool 8. The adjusting tool 8 includes a baffle plate 81 located in the mixing chamber R1 and a pipe member 82 as an operation unit fixed to the baffle plate 81. The baffle plate 81 is provided so as to face the hot air outlet 52 of the combustion furnace 5, and the baffle plate 81 is provided with a through hole 81a extending in the front-rear direction D1. The rear end of the pipe member 82 is inserted into the through hole 81a and fixed to the baffle plate 81, and the rear opening (second opening end) 82b faces the hot air outlet 52.

On the other hand, the front end portion of the pipe member 82 extends to the outside of the mixing chamber R1 (frame body 6). More specifically, a sleeve 9 is inserted through the side wall (front wall) of the mixing chamber R1 in the front-rear direction D1, and the pipe member 82 extends to the outside of the mixing chamber R1 via the sleeve 9. Therefore, the operator can grasp the front end portion of the pipe member 82, move the entire adjusting tool 8 in the front-rear direction D1, and manually adjust the distance (gap G) between the baffle plate 81 and the combustion chamber 5. The pressure in the combustion chamber 51 can be adjusted by adjusting the gap G. That is, the baffle plate 81 is moved in the direction closer to the hot air outlet 52 to reduce the gap G, thereby increasing the pressure in the combustion chamber 51, and is moved in the direction away from the hot air outlet 52 to increase the gap G. As a result, the pressure in the combustion chamber 51 can be reduced.

Further, a lid member 83 for sealing the front opening (first opening end) 82a of the pipe member 82 is detachably attached to the pipe member 82. Therefore, the operator can visually check the combustion chamber 51 by removing the lid member 83 from the pipe member 82 and looking into the inside from the front opening 82a.

The outer peripheral surface of the baffle plate 81 and the outer peripheral surface of the combustion furnace 5 are flush with each other in the front-rear direction D1, and the hot air W1 blown out from the hot air outlet 52 is between the baffle plate 81 and the combustion furnace 5. It passes through the gap G so as to flow outward in the radial direction along the surface of the baffle plate 81, and collides with the flow of the outside air W2 from the outside air supply path R2. At this time, since the flow direction of the hot air W1 flowing through the gap G is perpendicular to the flow direction of the outside air W2 flowing through the outside air supply path R2, mixing of the outside air W2 and the hot air W1 is promoted.

The air-fuel mixture W3 generated in the mixing chamber R1 in this way is attracted to the drying chamber (not shown) provided inside the drying furnace 3 by the action of the above-mentioned attraction fan (not shown), and is attracted to the duct 4 And when the air-fuel mixture W3 passes through the drying chamber, the object to be dried in the drying chamber is dried.

Here, the air volume of the air-fuel mixture W3 in the drying chamber can be adjusted by controlling the rotation amount (exhaust air pressure) of the attracting fan, but in the present embodiment, it is affected by the exhaust air pressure by the attracting fan. Instead, the internal pressure of the combustion furnace 5 (pressure of the combustion chamber 51) can be made constant, and the pressure suitable for ignition of the burner can be maintained.

That is, if there is no adjusting tool 8, it is necessary to control the rotation amount of the attracting fan to adjust the pressure of the combustion chamber 51. In this case, if the rotation amount of the attract fan is controlled to adjust the pressure of the combustion chamber 51, the air volume of the air-fuel mixture W3 also fluctuates, and conversely, the rotation amount of the attract fan is controlled to adjust the air volume of the air-fuel mixture W3. Then, there arises a problem that the pressure in the combustion chamber 51 fluctuates. However, in the present embodiment, since the pressure of the combustion chamber 51 can be adjusted by adjusting the position of the adjusting tool 8, the pressure of the combustion chamber 51 can be kept constant even if the air volume of the air-fuel mixture W3 is changed, and the pressure of the combustion chamber 51 can be kept constant. The air volume of the air-fuel mixture W3 can be adjusted without affecting the pressure of the air-fuel mixture.

The internal pressure of the combustion furnace 5 may be adjusted as follows. First, ignite the burner. Next, the lid member 83 is removed from the pipe member 82, the fuel chamber 51 is removed, and the position of the adjusting tool 8 is adjusted while visually checking the ignition state of the burner. Instead of / in addition to visually confirming the ignition state of the burner, a pressure gauge (not shown) can be inserted into the combustion chamber 51 through the pipe member 82 to directly measure the pressure in the combustion chamber 51. ..

Then, when the position of the adjusting tool 8 that can optimize the ignition state of the burner can be confirmed, the adjusting tool 8 is fixed to the sleeve 9. As a fixing means for fixing the adjusting tool 8 to the sleeve 9, for example, a screw 91 screwed into the sleeve 9 may be tightened, and the pipe member 82 may be pressed by the tip of the screw 91. After that, the lid member 83 is attached to the front opening 82a of the pipe member 82.

It should be noted that such position adjustment of the adjusting tool 8 only needs to be performed once, and basically it is not necessary to readjust it. Therefore, for example, it is preferable for the manufacturer to perform such adjustment before shipping the dryer 1 as a product.
Although the dryer according to the embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such an embodiment, and various modifications and modifications can be made without departing from the scope of the present invention. Is.

1 Dryer 3 Drying furnace 4 Duct 5 Combustion furnace 8 Regulator 51 Combustion chamber 52 Hot air outlet 81 Baffle plate 82 Pipe member R1 Mixing chamber W1 Hot air W2 Outside air W3 Air-fuel mixture (gas for drying)

Claims (6)

A combustion furnace for generating hot air by the burner, and
A baffle plate provided facing the hot air outlet of the combustion furnace is provided.
The hot air blown out from the hot air outlet flows through the gap between the combustion furnace and the baffle plate, and flows.
The baffle plate is a hot air generator characterized in that it is provided so as to be movable along a predetermined direction in a direction approaching the hot air outlet and a direction away from the hot air outlet. Mixing room and
Further provided with an outside air supply path for supplying outside air to the mixing chamber,
The baffle plate is provided in the mixing chamber.
The hot air generated in the combustion furnace is supplied to the mixing chamber through the hot air outlet and mixed with the outside air supplied to the mixing chamber via the outside air supply path to generate an air-fuel mixture. The hot air generator according to claim 1. Further equipped with pipe members,
The baffle plate is provided with a through hole extending in the predetermined direction.
One end of the pipe member is inserted into the through hole and fixed to the baffle plate.
The other end of the tube member extends outward of the mixing chamber and extends outward.
A lid member is detachably attached to the first opening end on the one end side of the tube member.
The hot air generator according to claim 2, wherein the second opening end on the other end side of the pipe member faces the hot air outlet. A sleeve extending in the predetermined direction is provided on the side wall of the mixing chamber.
The claim is characterized in that the tube member is inserted through the sleeve and extends from the inside to the outside of the mixing chamber, and the sleeve is equipped with a fixing means for fixing the tube member to the sleeve. 3. The hot air generator according to 3. The outside air supply path is provided on the outer periphery of the combustion furnace and has an annular vertical cross section.
The hot air generator according to any one of claims 2 to 4, wherein the outer peripheral surface of the combustion furnace and the outer peripheral surface of the baffle plate are flush with each other in the predetermined direction. A hot air generator for generating drying gas, and
A drying furnace for drying the object to be dried by the drying gas from the hot air generator is provided.
The hot air generator is the hot air generator according to any one of claims 1 to 5.
A dryer characterized in that the air-fuel mixture is supplied to the drying furnace as the drying gas.

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