JPH0547006U - Damper device for exhaust flue of asphalt plant - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent dust from wearing the inner wall of the flue immediately adjacent to the downstream of the airflow adjustment damper installed in the exhaust flue of the asphalt plant. [Structure] The damper opening / closing cylinder 17 is driven to divide the dampers 11a, 11b, 11c into the exhaust flue 3,
When 11d is throttled through the link mechanism, the link mechanism structure is such that the downstream side A of each damper rotates toward the central portion of the exhaust flue. As a result, the exhaust gas passing between the dampers flows toward the central portion of the exhaust flue 3, and the dust contained in the exhaust gas does not collide with the flue wall surface immediately downstream of the damper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damper device arranged in an exhaust flue of a dryer for heating aggregate or waste material of an asphalt plant.

[0002]

[Prior Art]

 The asphalt plant sends the hot air of the burner 2 into the dryer 1 for heating aggregates as shown in FIG. 3 and sucks the exhaust gas by the exhaust fan 4 provided downstream of the exhaust flue 3 to remove the dust in the exhaust gas through the dust collector 5. It is captured and released as a clean gas from the chimney 6 into the atmosphere. Then, the opening of the air volume adjusting damper is appropriately adjusted so that the air volume corresponding to the fluctuating gas volume generated from the aggregate heating dryer 1 is sucked and exhausted by the exhaust fan 4. FIG. 4 shows a conventional damper device arranged in an exhaust flue, which employs a link mechanism in which a plurality of divided dampers 7a, 7b, 7c, 7d are driven by one arm 8 as shown in the figure. The cylinders 9 are driven to open and close the dampers 7 in parallel to adjust the air volume.

[0003]

[Problems to be solved by the device]

 However, in the conventional damper device, when the dampers 7a, 7b, 7c, 7d are throttled for adjusting the air volume, each damper is tilted in the same direction because it is operated by the link mechanism connected to one arm 8. Becomes Therefore, the flow of the exhaust gas is bent along the dampers 7a, 7b, 7c, 7d as shown by the dotted arrow in FIG. As a result, the dust contained in the exhaust gas collides with the flue wall surface on the one side immediately downstream of the damper and abrades the wall surface, shortening the life of the exhaust flue 3 in this portion.

In view of the above points, the present invention provides a damper device for an exhaust flue of an asphalt plant, which can prevent the wear of the wall of the flue near the downstream of the damper for adjusting the air flow disposed in the exhaust flue as much as possible. The purpose is to do.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention adjusts the opening degree by connecting a plurality of divided dampers in an exhaust flue by a link mechanism to adjust the amount of exhaust gas discharged from an aggregate heating dryer. In the exhaust flue damper device described above, the link mechanism structure is such that the downstream side of each damper divided when the damper is throttled is rotated toward the central part of the exhaust flue.

[0006]

[Action]

 According to the present invention, when the dampers are throttled to narrow the gas passage of the exhaust flue, the downstream side of each damper rotates toward the central part of the exhaust flue, so that the exhaust gas flowing between the dampers is exhausted. Will flow toward the center of the exhaust flue, and the dust contained in the exhaust gas will not easily collide with the flue wall surface immediately downstream of the damper, and the exhaust flue will be prevented from wearing as much as possible.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 10 denotes a damper device arranged in the exhaust flue 3 for adjusting the air flow, and includes a plurality of divided dampers, for example, four dampers 11a, 11b, 11c, and 11d in the exhaust flue 3. It is fixed to shafts 12a, 12b, 12c, 12d that are rotatable through the wall of the exhaust flue 3, and the dampers 11a, 11b, 11c, 11d are opened and closed by the rotation of the shafts.

Rotating arms 13a, 13b, 13c, 13d for rotating the shafts are provided at one ends of the shafts 12a, 12b, 12c, 12d substantially in parallel with the dampers 11a, 11b, 11c, 11d. It is fixed. Then, connecting arms 14, 15, 16 are connected to the rotating arms 13a, 13b, 13c, 13d to form a link mechanism for interlocking and opening / closing the dampers 11a, 11b, 11c, 11d. is doing.

The connection method of the connecting arms 14, 15, 16 and the dampers 11a, 11b, 11c, 11d is such that the downstream side A of the damper faces the central part of the exhaust flue when the damper is squeezed. The exhaust flue 3 is connected so as to be antisymmetric with respect to the center. That is, the connecting arm 14 located on one side of the central portion of the exhaust flue 3 is connected to each of the downstream sides of the rotating arms 13a and 13b, and is located on the other side of the central portion of the exhaust flue 3. The connecting arm 16 is connected to each of the rotating arms 13c and 13d on the upstream side. The rotation arms 13b and 13c located on both sides of the central portion of the exhaust flue 3 are connected by the connection arm 15 between the upstream side of the rotation arm 13b and the downstream side of the rotation arm 13c. With such a link mechanism structure, the opening and closing directions of the dampers 11a and 11b and the dampers 11c and 11d located on both sides of the central portion of the exhaust flue 3 are opposite to each other, and the dampers 11a and 11b and the dampers 11a and 11b are opposite to each other. 11c and 11d are located substantially symmetrically with respect to the central portion of the exhaust flue 3.

Reference numeral 17 denotes a cylinder for operating the damper opening / closing link mechanism. The cylinder 17 is attached to a support member 18 fixed to a side wall of the exhaust flue 3 and a tip end portion of a piston rod 19 thereof is attached. It is attached to one end of the rotating arm 13a so that when the piston rod 19 is extended, each of the dampers 11a, 11b, 11c and 11d is fully opened via the link mechanism, and when the piston rod 19 is contracted, the damper is fully closed. So that

However, when the piston rod 19 of the cylinder 17 is contracted to reduce the air volume during operation of the aggregate heating dryer 1, the dampers 11a, 11b, 11c are connected via the damper opening / closing link mechanism. The downstream side A of 11d faces the central part of the exhaust flue. As a result, the flow direction of the exhaust gas passing between the dampers 11a, 11b, 11c and 11d is directed to the central part of the exhaust flue as shown by the dotted arrow in Fig. 1, and most of the dust contained in the exhaust gas is exhausted. By passing through the central part of the flue 3, the collision with the flue wall surface immediately downstream of the damper is reduced, and the flue is prevented from wearing as much as possible.

In the present embodiment, the case where the number of divided dampers is four has been described, but even if the number of divided dampers is different from this, the downstream side A of each divided damper is divided in the same manner as described above when the damper is throttled. It suffices if the link mechanism structure is such that the is rotated toward the center of the exhaust flue.

[0014]

[Effect of the device]

 As described above, according to the present invention, the link mechanism structure is configured so that the downstream side A of each of the divided dampers 11a, 11b, 11c, 11d when the damper is throttled is rotated toward the central portion of the exhaust flue. Therefore, the flow of the exhaust gas passing between the dampers will flow toward the central part of the exhaust flue, and the dust contained in the exhaust gas will not easily collide with the flue wall surface immediately downstream of the damper, and Wear can be prevented as much as possible.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a schematic configuration diagram of an asphalt plant.

FIG. 4 is a front view showing a conventional example of a damper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dryer for heating aggregate 3 ... Exhaust flue 10 ... Damper device 11a, 11b, 11c, 11d ... Damper A ... Downstream side 13a, 13b, 13c, 13 ... Rotating arm 14, 15, 16 … Connecting arm 17… Damper opening / closing cylinder

Claims (1)

[Scope of utility model registration request] 1. An exhaust flue damper device for adjusting the opening degree by connecting a plurality of divided dampers in an exhaust flue by a link mechanism for adjusting the amount of exhaust gas discharged from an aggregate heating dryer. An exhaust flue damper device for an asphalt plant, which has a link mechanism structure in which the downstream side of each of the dampers divided when the damper is throttled is rotated toward the central part of the exhaust flue.