JP3255035B2 - Damper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a damper device,
In particular, the present invention relates to a damper device used for a dust collector for treating exhaust gas from various boilers and incinerators.

[0002]

2. Description of the Related Art In a dust collector for treating exhaust gas from a boiler or an incinerator, a gas flow is switched to a bypass side in accordance with an amount of gas introduced into the dust collector and a gas temperature in order to protect a bag filter from heat of the exhaust gas to be treated. May drive.
Conventionally, as shown in FIG. 6, switching of the gas flow of this dust collector is performed by separately arranging poppet dampers 4, 5, 6, or butterfly dampers in an inlet duct 1, an outlet duct 2 and a bypass duct 3, respectively. In this case, each of the dampers 4 to 6 is individually driven and controlled.

[0003]

However, the conventional switching method has a drawback in that a driving device is required for each of the dampers, so that the installation space becomes large. In addition, since they operate individually, there is a disadvantage that a time lag occurs every time the damper is switched.

Further, when the poppet damper is employed, there is a disadvantage that the pressure loss of the dust collector main body is instantaneously eliminated when switching to the bypass side, which adversely affects the equipment at the preceding stage. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a damper device capable of reducing an installation space and safely operating a device in a preceding stage of the device.

[0005]

According to the present invention, in order to achieve the above object, an inlet duct communicating with an inlet of a dust collector and an outlet duct communicating with an outlet are connected by a bypass duct, and a poppet provided in each of the ducts is provided. In a damper device that drives and controls a damper to switch a gas flow from the inlet duct to a dust collector side or a bypass duct side, the inlet duct, the outlet duct, and the bypass duct are coaxially overlapped at at least one place. And one coaxially penetrating the bypass duct
Of each poppet damper by providing a shaft of
Each valve body of the respective poppet damper so as to drive control by the one shaft, the orifice plate is provided in the bypass duct, the slide play along the orifice plate
By changing the opening area of the orifice plate by sliding the gas flow, the sudden pressure fluctuation caused when the gas flow is switched to the bypass duct side is reduced , and
To avoid contact with the shaft on the ride plate
Is formed .

According to the present invention, the valve body of the poppet damper disposed in each duct is driven and controlled by one shaft. Therefore, only one drive device is required, and the installation space can be reduced. Further, at the time of driving, no time lag occurs between the poppet dampers. In addition, vipa
To suppress sudden pressure fluctuations that occur when switching to the
Can be operated safely and stably.
You.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a damper device according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a damper device according to an embodiment of the present invention. As shown in the drawing, an inlet duct 14 is connected to the inlet 12 of the dust collector 10, and an outlet duct 18 is connected to the outlet 16. The inlet duct 14 and the outlet duct 18 are arranged coaxially with each other, and are connected therebetween by a bypass duct 20.

The inlet duct 14 and the bypass duct 20
A supply duct 22 is connected to the connection portion with the exhaust gas from the boiler or the incinerator through the supply duct 22. An exhaust duct 24 is connected to a connection portion between the outlet duct 18 and the bypass duct 20, and exhaust gas treated by the dust collector 10 is exhausted through the exhaust duct 24.

The inlet duct 14, the outlet duct 18 and the bypass duct 20 are provided with a poppet type inlet damper 26, an outlet damper 28 and a bypass damper 30, respectively. These dampers 26 to 30 are arranged coaxially, and the valve bodies 32 and 34 of the dampers 26 to 30 are
It is fixed to the shaft 36 of the book. The shaft 36 is
The upper part is slidably supported by a bearing 38 installed on the upper part of the entrance duct 14, and is driven up and down by a cylinder 40 installed on the upper part of the bearing 38.

Incidentally, each of the dampers 26 to 30 needs to close the bypass damper 30 when introducing the gas flow into the dust collector 10, and close the inlet damper 26 and the outlet damper 28 when bypassing. Therefore, the arrangement of the valve bodies 32 and 34 fixed to the shaft 36 and the stroke of the cylinder 40 for driving the shaft 36 are set as follows.

As shown in FIG. 1, the outlet damper 28 and the bypass damper 30 share a valve body 34 with each other. When the valve element 34 closes the outlet damper 28, the valve elements 32 and 34 are fixed to the shaft 36 so that one of the valve elements 32 also closes the inlet damper 26. The stroke of the cylinder 40 is set such that the valve body 34 closes the outlet damper 28 when the shaft 36 is raised, and the valve body 34 closes the bypass damper 30 when the shaft 36 is pushed down.

As a result, when the shaft 36 is pushed down, the valve body 34 closes the bypass damper 30, and when the shaft 36 is raised, the valve bodies 32, 34 are brought into contact with the inlet damper 26.
And the outlet damper 28 is closed. Therefore, when introducing the gas flow into the dust collector 10, the cylinder 3
6, the gas flow can be switched by raising the shaft 36 with the cylinder 40 at the time of bypass.

In the present embodiment, each damper 26
Although the poppet damper is adopted in the apparatus No. 1 to No. 30, when the gas flow is switched to the bypass side, the pressure loss of the dust collector 10 is instantaneously eliminated, which adversely affects the preceding device. There is. In order to solve this drawback, a pressure adjusting mechanism 42 is provided in the bypass duct 20.

FIG. 2 is a plan view showing the structure of the pressure adjusting mechanism 42, FIG. 3 is a sectional view taken along line AA of FIG.
It is -B sectional drawing. The pressure adjusting mechanism 42 adjusts the pressure by changing the opening area of the orifice plate 44 installed in the bypass duct 20 with a slide plate 46. A stool 48 formed in a cone shape is provided on the upper portion of the orifice plate 44. By providing the stool 48, accumulation of dust and the like on the upper portion of the orifice plate 44 is prevented.

Further, the slide plate 46 is provided as shown in FIG.
As shown in (1), the bypass duct 20 is inserted into the duct 20 through an opening 50 formed on a side surface thereof. The inserted slide plate 46 has both edges thereof at the orifice plate 44.
Guided by a pair of guide members 52, 52 integrally formed on the lower surface, the orifice plate 44 slides on the lower surface.
As shown in FIG. 4, the guide members 52, 52 are formed in an L-shaped cross section. The guide members 52, 52, together with the orifice plate 44, sandwich the slide plate 46 therebetween.
Guide 6 horizontally. In the figure, reference numeral 54 denotes a handle, and reference numeral 56 denotes a cover of the opening 50. The slit 58 formed in the slide plate 46 is for avoiding contact with the shaft 36.

The operation of the embodiment of the damper device according to the present invention configured as described above is as follows. When the exhaust gas supplied from the supply duct 22 is introduced into the dust collector 10, the cylinder 40 is driven to push down the shaft 36. As a result, the valve element 34 closes the bypass damper 30, and as a result, the bypass duct 20 is closed. Therefore, all of the exhaust gas flows through the dust collector 1 through the inlet duct 14.
0 is introduced. Further, the exhaust gas treated by the dust collector 10 is exhausted to the exhaust duct 24 via the outlet duct 18 without flowing backward because the bypass duct 20 is closed.

On the other hand, at the time of bypass, the shaft 36 is pulled up by driving the cylinder 40. Thereby, the valve element 3
2, 34 close the inlet damper 26 and the outlet damper 28, so that the inlet duct 14 and the outlet duct 18 are closed. Therefore, all exhaust gas is
0 and is exhausted to the exhaust duct 24. By the way, as described above, in the poppet damper, when the gas flow is switched to the bypass side, the pressure loss of the dust collector 10 is instantaneously eliminated, which has a problem of adversely affecting the preceding device. However, in the damper device of the present embodiment, such a problem is solved by installing the pressure adjusting mechanism 42.

That is, the opening area of the orifice plate 44 is adjusted by the slide plate 46, and the orifice plate 44 is adjusted.
By providing a constant pressure loss in the above, a sudden pressure fluctuation at the time of bypass switching can be mitigated. As a result, the problem of adversely affecting the preceding device is eliminated. Thus, according to the damper device of the present embodiment,
By controlling the drive of the valve bodies 32 and 34 of the dampers 26 to 30 with one shaft 36, the installation space can be reduced. In addition, by installing the pressure adjusting mechanism 42, it is possible to suppress a sudden pressure fluctuation that occurs at the time of switching the bypass, and to operate the preceding apparatus safely and stably.

In the present embodiment, the outlet damper 28
And the valve body 34 of the bypass damper 30 are shared, but they may be installed individually. At this time, when the shaft 36 is pulled up, the stroke of the cylinder 40
6 and the valve body of the outlet damper 28 are each damper 26, 28
Is closed, and the valve element of the bypass damper 30 is set to close the bypass damper 30 when the shaft 36 is pressed down.

FIG. 5 is a block diagram of a damper device according to a second embodiment of the present invention. Note that the same members and the same devices as those of the damper device of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the first embodiment, the opening area of the orifice plate 44 is fixed once set. However, in the second embodiment, the orifice plate 44 is fixed.
And the opening area is varied based on the detected value.

As shown in FIG.
Is driven by a feed screw mechanism 60 installed on the supply duct 22. In the feed screw mechanism 60, the ball screw 64 rotates by driving the servo motor 62, and the rotation causes the nut member 66 to move left and right. The end of the slide plate 46 is supported by a nut member 66.

The driving of the servo motor 62 is controlled by a controller 68. This control device 68
Calculates the optimal opening area of the orifice plate 44 based on the detection values of the pressure sensors 70 and 72 installed upstream and downstream of the orifice plate 44, and outputs a drive signal to the servomotor 62. The operation of the second embodiment of the damper device according to the present invention configured as described above is as follows.

Since the pressure adjusting mechanism 42 operates only at the time of bypass, the control device 68 operates together with the switching of the bypass. When the bypass is switched, the orifice plate 44
Has the smallest opening area. That is, the slide plate 46 is in a closed state. First, the control device 68
Calculates the differential pressure above and below the orifice plate 44 from the detected pressure values output from the pressure sensors 70 and 72. Then, the optimum opening area of the orifice plate 44 is calculated from the calculation result.

The controller 68 further calculates the amount of movement of the slide plate 46 based on the calculated opening area,
The drive signal is output to the servo motor 62. The servo motor 62 rotates the ball screw 64 based on the driving signal, and as a result, the slide plate 46 slides, and the orifice plate 44 opens at an optimum value. The above control is repeatedly performed at a fixed time interval, whereby the orifice plate 44 is always opened at an optimum value. Therefore, the preceding apparatus can be operated more safely and stably.

Although the slide plate 46 is driven by the feed screw mechanism 60 in the present embodiment, it may be driven by a cylinder or the like.

[0026]

As described above, according to the present invention,
The installation space and equipment costs can be reduced, and the pre-stage device can be operated safely and stably by suppressing abrupt pressure fluctuation occurring at the time of bypass switching.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of a damper structure according to the present invention.

FIG. 2 is a plan view showing a configuration of a pressure adjusting mechanism.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a configuration diagram of a damper device according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional damper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Dust collector 12 ... Dust collector entrance 14 ... Inlet duct 16 ... Dust collector outlet 18 ... Exit duct 20 ... Bypass duct 22 ... Supply duct 24 ... Exhaust duct 26 ... Inlet damper 28 ... Outlet damper 30 ... Bypass damper 32, 34 ... Valve Body 36 ... Shaft 40 ... Cylinder 42 ... Pressure adjusting mechanism 44 ... Orifice plate 46 ... Slide plate 48 ... Stool

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Yuki 537, Uehongo, Matsudo-shi, Chiba Investigator, Hitachi Plant Construction Machinery & Engineering Co., Ltd. Tetsuo Sekiguchi (56) References Kaihei 2-104829 (JP, U) JP-A-63-167045 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23L 13/00 F23L 11/00 F23J 15/00

Claims (2)

(57) [Claims] An inlet duct communicating with an inlet of a dust collector and an outlet duct communicating with an outlet are connected by a bypass duct, and a poppet damper provided in each of the ducts is drive-controlled to allow a gas flow from the inlet duct to flow. in the damper device is switched to a dust collector side or bypass duct side, as well as disposing the bypass duct and the inlet duct and said outlet duct so as to overlap coaxially least one location, the bypass duct on the coaxial 1 to penetrate
Provided the shaft arranged each poppet damper, each valve bodies of the respective poppet damper so as to drive control by the one shaft, the orifice plate is provided in the bypass duct, the orifice plate Slide along
By changing the opening area of the orifice plate by sliding the rate, the sudden pressure fluctuation caused when the gas flow is switched to the bypass duct side is reduced , and
Avoid contact of the slide plate with the shaft
Device for forming a slit for use in the damper. 2. The damper device according to claim 1, wherein an opening area of said orifice plate is varied according to a pressure difference between an upstream side and a downstream side of said orifice plate.