JPS58142078A - Gravity damper device in duct - Google Patents

Abstract

PURPOSE:To provide a gravity damper device in a duct which can remove sliding between the damper device and a seal material in a simple structure by obliquely disposing a damper gate in such a manner that when a passage is totally closed, the gate is pressed to a damper sheet portion by partial pressure of dead load of the gate. CONSTITUTION:When a duct 2 forming a flue 1 is horizontal, a gate 3 is disposed obliquely so that the gate 3 is vertically rolled down on a seal material 5 between a damper sheet portion 4 and the gate 3. In this case, if the angle of inclination of the gate 3 is theta, the orthogonal force of the gate 3 is expressed by Wsintheta (W: dead load of the gate). Accordingly, W and theta can be selected by a spring constant and displacement of the seal material 5. In order to open and close the gate 3, a storing space 6 for storing the gate 3 horizontally is disposed on the upper surface portion of the duct 2 in such a manner that the gate 3 is moved between the damper sheet portion 4 and the storing space 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damper device installed in an exhaust gas flue &C' device in a boiler plant, a gas turbine plant, etc., and is capable of preventing gas Ij1 leakage from the conventional complete shut-off. The purpose of the 4th damper gate is to have a simple structure, eliminate sliding movement with the sealing material, and easily open and close the damper gate with a small amount of power.

Conventional oak damper devices include a looper type in which blades that rotate around an intermediate shaft are installed in multiple stages and each blade opens and closes in conjunction with each other, and a single gate plate that moves up and down. Generally known are the guillotine type, which blocks the air flow 40, and the goggle valve type, which uses a relatively small opening 9I in the case of a circular duct, but the looper type requires a partition plate inside the duct to receive and stop the tips of the blades. This causes overwhelm, and the seal length also increases, increasing the leakage rate.
In addition, with the guillotine type, when the gate is raised and lowered, the upper sealing material slides continuously while being crimped with the gate, so the lifting power is large, and the sealing material is easily damaged due to sliding, and the sealing material is crimped. This method requires a crimping structure for crimping, which has the disadvantage of a complicated structure and high cost.

The present invention addresses these conventional drawbacks, and has a structure in which a damper that opens and closes across the passage is installed in a duct in a gate type manner, and the damper gate is placed across the entire passage. The feature is that the gate is installed diagonally so that it is pressed against the damper seat part by the force of the gate's own weight when it is closed.The seven drawings of the pancreatic torture case will be explained below.

In the first case, when the duct 2 constituting the flue (passage 1) is horizontal, the gate 3 is placed diagonally, and the gate 3 is placed against the sealing material 5 between the damper sheet super heavy and the gate 3.
so that it rolls down vertically.

In this case, if the inclination angle of the gate 3 is θ, the magnitude of W = gate self-weight Pmi, component force perpendicular to the gate - WlljinθP is determined by θ and W, and it is possible to apply a uniform force to the sealing material. can. Therefore, W and θ can be selected depending on the spring constant and displacement filter of the sealing material.

If the 4 roads are perpendicular, you can use Gate 1W for 1001m.

There are the following methods for opening and closing the gate 3.

-) As shown in Figure 3, a storage space 6 is provided in the upper lfi part of the duct 2 to store the cage 3 horizontally, and the gate 3 is a damper seat! Horizontal movement is made between the IS 4 and the storage space 6.

(b) A storage space 7 is provided in the upper part of the duct 2 to store the gate vertically, and the gate 3 is raised vertically from the slanted fully closed state (Fig. 4).

-) A storage space 8 is provided in the upper part of the duct 2 to store the gate in an inclined manner. figure).

In order to roll the gate 3 perpendicularly to the slope, rollers 9 and 10 are provided at both the upper and lower ends of the gate, and the rollers are rolled onto the guide rails 11 and 12, as shown in Figure 2.
do.

The sealing method is a known method, but it is preferable to use an air seal as shown in Fig. 86. Damper seat IH4
Two strips of seal rubber 5ai are provided between them, and seal air is blown from the air hole. Sealing material 6 is gas alloe
Below c, use silicone rubber, etc. For loO”0 or more, use a semicircular thin iron plate (SUS, etc.).

As explained above, in this invention, when the damper gate is fully closed, the damper gate is installed diagonally so that it is crimped to the damper seat (d) by the force of the gate's own weight, and the pressure to the sealing material is crimped by the force of the gate's own weight. Because the pressure is applied uniformly over the entire surface (no power is required for crimping the seal material, a complete seal can be expected), and since there is no sliding on the seal material, the power required to raise and lower the gate is much smaller than that of conventional types. Moreover, since there are no 4 crimping joints, the gate lift 41 and the plate are simplified, and the cost can be reduced.Also, regardless of the shape of the duct, it can also be easily used for large cross-section ducts. You can take control of the product, and there is less wear and tear on the sealing material.

[Brief explanation of drawings]

The drawings show a practical example of this invention, and Figure m1 shows a part of the damper of the duct. The cross-sectional side view, Figure 2 is 1ili! of the gate guide section. 1st view, ij 3, 4 and 5-
FIG. 6 is a partially enlarged sectional view showing the seal portion of the gate. l...Through 4 ゛ 2...Duct 3...
・Kate number...Seal part 6...
Sealing material applicant Marusei Heavy Industries Co., Ltd. Rokushacho, continued amendment -) (1 shot) 1. Heavy manual labor Patent No. 10394 2 Name of the invention Direct type damper device in duct 3, person who performs hI+correction ・14: Relationship with matter
Patent applicant representative Daizo Odawara 4, agent 512 person version dJK Kawa-ku internal use 11th block B-31,,
,,, - - Correct the phrase "wear and tear of" on page 5, line 11 of Saka No. 507 #IIA to read "wear and tear of." 427-

Claims (1)

[Claims] A device in which a gate is provided with a damper that opens and closes across the passage in the duct, and the damper gate is installed diagonally so that it is pressed against the damper seat part by the force of the gate's own weight when the passage is fully closed. A gravity damper device in a duct which is characterized by: