JPH0886366A - Changeover damper for dust collecter - Google Patents

Abstract

PURPOSE: To prevent the piling up of dust on a valve body upper surface and realize sure closure to a bypass side by providing a dust containing air introduction opening on the side part of a chamber that houses a movable valve body, projecting at the same time the upper surface of the movable valve body into a conical shape. CONSTITUTION: A changeover valve 6 is equipped with a valve body 7 and an ascent/descent cylinder 8 to ascend/descend this valve body 7, and the upper surface of the valve body 7 is formed into a projection portion 20 projecting into a conical shape, and the angle α of the conical projection portion 20 is formed preferably into the angle of piling-up dust free falling, that is, a rest angle of more than it so as to prevent the piling up of dust. As a result, dust in dust-containing air to be fed does not pile up on the valve body upper surface, and until the temperature of a dust collecter reaches the predetermined temperature of an operation start time or the like, a changeover damper 1 operates the changeover valve 6 and changes the dust-containing air to be fed over to a bypass passage B side. At this time, by forming the upper part of the movable valve body 7 into the projection portion 20 projecting into a conical shape, the dust contained in the air does not pile up on the valve body 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching damper provided on the dust-containing air inlet side of a dust collector.

[0002]

2. Description of the Related Art For example, a means has been adopted in which dust-containing air discharged from an incinerator for municipal waste is supplied to a dust collector to remove the contained dust. At this time, there is no problem if the incinerator is in continuous operation day and night, but if it is stopped at night, the temperature inside the dust collector is low, and high temperature dust-containing air is collected when the incinerator starts operating. When it is supplied into the dust device, there is a problem that dew condensation occurs and various troubles occur.

Therefore, when the operation is restarted, it is necessary to raise the temperature in the dust collector to a predetermined temperature and, at the same time, guide the dust-containing air from the incinerator to the bypass passage, and therefore the dust-containing air of the dust collector is required. A switching damper is provided on the supply side, and a method is adopted in which the dust-containing air is temporarily treated through a bypass passage by an appropriate means separate from the dust collector.

An example of the switching damper is shown in FIG. In the figure, a switching damper 50 has a dust generator, for example, a dust-containing air inlet 52 connected to a municipal waste incinerator A on one side of a housing 51, and a main discharge port 53 for a dust collector C on the other side.
And the auxiliary discharge port 54 for the bypass passage B and the switching valve 5
5 and 5. The switching valve 55 includes a flat plate-shaped valve body 56 and a lifting cylinder 57 that lifts and lowers the valve body 56. Inside the housing 51, an air introduction chamber 60 having the dust-containing air introduction port 52 formed on one side, a main discharge chamber 61 having a main discharge port 53 formed on one side, and a sub discharge port 54 formed on one side. The auxiliary discharge chamber 62 to be formed is formed, and fixed valve seats 63 and 64 are formed on the partition walls of the respective chambers 60, 61 and 62 so as to face the valve body 56.

However, for example, when the supply of the dust-containing air to the dust collector C is stopped such as when the incinerator A is started, the switching damper 50 is switched to the bypass passage B side, and the dust collector is heated to a predetermined temperature. The exhaust of the switching damper 50 is switched to the dust collector side.

[0006]

When the dust-containing air is guided to the bypass side, dust in the circulating air is accumulated on the flat plate-shaped valve body 56. Therefore, when the valve body is lifted, the upper part is fixed. There is a problem that dust cannot be caught between the valve seat 64 and the valve seat 64 to prevent the valve from being reliably closed. In view of these points, it is an object of the present invention to prevent dust from accumulating on the upper surface of the valve element and to reliably close the bypass side.

[0007]

To achieve the above object, a switching damper for a dust collector of the present invention is provided on the dust-containing air introduction side of the dust collector, and the supplied dust-containing air is supplied to the dust collector and a bypass passage. In a switching damper that performs selective switching, the damper includes a movable valve body that moves up and down, and fixed valve seats provided above and below the movable valve body. The introduction port is provided, and the upper surface of the movable valve body is made to protrude in a conical shape.

[0008]

[Operation] When the switching valve is switched to the bypass passage side by protruding the valve body upper surface in a conical shape, dust contained in the air passing over the valve valve upper surface of the switching valve is accumulated on the valve body upper portion. There is nothing to do.

[0009]

[Embodiment] FIG. 1 shows an embodiment of a switching damper for the dust collector of the present invention. Similar to the conventional structure, this switching damper 1 has a dust generator, for example, a dust-containing air inlet 3 connected to a municipal solid waste incinerator A on one side of the housing 2 and a main exhaust for the dust collector C on the other side. An outlet 4, an auxiliary outlet 5 for the bypass passage B, and a switching valve 6 are provided. The switching valve 6 is the valve body 7
And an elevating cylinder 8 that elevates and lowers the valve body 7.
Further, inside the housing 2, an air introduction chamber 10 having the dust-containing air introduction port 3 formed on one side, a main discharge chamber 11 having the main discharge port 4 formed on one side, and a sub discharge port 5 are provided. The auxiliary discharge chamber 12 formed on the side is formed, and upper and lower fixed valve seats 13 and 14 are formed on the partition walls of the chambers 10, 11 and 12 so as to face the valve body 7. Reference numerals 15 and 16 are elastic valve plates attached to the respective fixed valve seats.

The present invention, however, is one in which the upper surface of the valve body 7 is formed into the protruding portion 20 protruding in a conical shape. The angle α of the conical protrusion 20 is preferably formed to a free fall angle of the accumulated dust, that is, a repose angle or more so as to prevent the accumulation of dust. The dust in the dust-containing air supplied by this does not deposit on the upper surface of the valve body.

In the above structure, the switching damper 1 operates the switching valve 6 to switch the supplied dust-containing air to the bypass passage B side until the temperature of the dust collector reaches a predetermined temperature such as at the start of operation. At this time, by forming a conical projection on the upper portion of the movable valve body 7, dust contained in the air is not deposited on the valve body 7.

[0012]

According to the present invention, since the conical protrusion is formed on the upper surface of the switching valve body of the switching damper disposed on the dust-containing air suction side of the dust collector, the process air is directed to the bypass passage side. During transfer, dust contained in the processing air does not deposit on the upper surface of the valve body. Therefore, when the valve body is moved up to guide the treated air to the dust collector side, the conventional defect that obstructs the blockage at the time of rising of the valve body due to the accumulation of the dust is prevented, and switching is ensured, and the dust-containing dust supplied is supplied. Air is reliably supplied to the dust collector side, and there is no risk of leakage to the bypass passage side.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of a switching damper for a dust collector of the present invention.

FIG. 2 is an overall explanatory view of an example of a switching damper for a conventional dust collector.

[Explanation of symbols]

 1 Switching damper 6 Switching valve 7 Valve body 13 Fixed valve seat 14 Fixed valve seat 20 Projection part

Claims (1)

[Claims] 1. A switching damper, which is provided on a dust-containing air introduction side of a dust collector and selectively switches supplied dust-containing air between the dust collector and a bypass passage, wherein the damper includes a movable valve body that moves up and down, It is equipped with fixed valve seats provided above and below the movable valve element, a dust-containing air inlet is provided on the side of the chamber that houses the movable valve element, and the upper surface of the movable valve element is made to project in a conical shape. A switching damper for the dust collector.