JPH10118532A - Discharge port diameter variable nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge port diameter variable nozzle by which a fixed velocity is always obtained even when the flow rate is changed and whose external size is not enlarged. SOLUTION: In a cylindrical body 1, there are provided plural blades 3 freely inclined toward an axial center along the inner periphery near a discharge port 2 of the main body, connecting arms 4 freely rotatably engaged with the blades at one end thereof, an operating bar 5 freely rotatably engaged with the other end of the connecting arms 4 at one end and extending in the body 1 in the axis direction, and a lever 6 for moving the operating bar 5 in the axis direction. When the operating bar 5 is moved in the axial direction by the lever 6, the connecting arms 4 are displaced, and with that, the blades 3 are inclined toward the axial center to change the opening area of the discharge port 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle for discharging air and the like used for incinerating refuse and industrial waste in, for example, a refuse incinerator.

[0002]

2. Description of the Related Art In a refuse incinerator, in order to incinerate refuse efficiently, a certain amount of air or circulating gas is usually supplied to the refuse by means of a furnace temperature control air or exhaust gas recirculation nozzle. It is desirable to blow into the furnace at a flow rate of In order to blow at a constant flow rate, it is necessary to blow at a constant flow rate when the diameter of the discharge port of the nozzle does not change.

However, in order to incinerate the refuse efficiently, the flow rate must be changed according to the temperature in the furnace. For this reason, conventionally, as shown in FIG. 6, a tip metal fitting 42 having an appropriate discharge diameter is attached to the tip of the nozzle 41 so that a constant flow velocity can be obtained in response to a change in the flow rate. However, there is a problem in that the metal fittings 42 must be replaced appropriately according to the flow rate, and the work of replacing the metal fittings 42 is very troublesome. On the other hand,
In order to meet the above demand, Japanese Unexamined Patent Publication (Kokai) No. H11-15064 discloses a valve technology. That is, as shown in FIG. 7, a plurality of blades 52 provided over the entire circumference inside the pipe line 51 of the valve outer cylinder 50 are reciprocated by the sector 54, the plunger 55 and the like interlocked by the rotation of the pinion 53. Move
This is to change the opening area of the conduit 51 formed by the ends of the plurality of blades 52. Thus, the flow rate passing through the pipe 51 can be controlled, and the valve can be applied to the nozzle.

[0004] However, the valve disclosed in the above publication has a sector 5 for changing the opening area of the conduit 51.
Since the valve 4 and the pinion 53 are provided on the outer peripheral portion of the valve outer cylinder 50, there is a problem that the outer shape of the valve itself becomes large and the installation space must be taken into consideration in practical use.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a variable discharge port diameter nozzle which can always obtain a constant flow rate even if the flow rate changes and does not increase its outer shape.

[0006]

Means for Solving the Problems A means for solving the problems according to the present invention comprises a cylindrical main body, and a plurality of blades provided so as to be tiltable toward an axis along an inner periphery near a discharge port of the main body. One end of the connecting arm rotatably engaged with the blade, one end of the connecting arm is rotatably engaged with the other end of the connecting arm, and the operating rod extends in the main body in the axial direction. The operating rod is moved in the axial direction. And a driving means for driving.

According to the above construction, when the driving rod moves the operating rod in the axial direction, the connecting arm engaged with one end of the operating rod is displaced in conjunction with the movement of the operating rod. With the displacement, the blade engaged with the other end of the connecting arm tilts toward the axis. Due to this inclination, the opening area of the discharge port is reduced. Also, when the operation stick moves in the opposite direction,
The opening area of the discharge port is increased. Therefore, by driving the driving means, the opening area of the discharge port can be easily changed. Therefore, the flow velocity of air or the like passing through the discharge port can be kept constant regardless of the flow rate.

Further, the blades may be arranged sequentially with a part of the blades overlapping with the adjacent blades. If you do this,
When one blade is tilted toward the axis, the overlapping portion acts to press the adjacent blade, so that the adjacent blades tilt one after another. In addition, since airtightness is maintained by the overlapping portions of the inclined blades, the flow velocity of air or the like can be accurately changed.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1A and 1B show a configuration of a discharge port diameter variable nozzle according to an embodiment of the present invention, wherein FIG. 1A is a view from the discharge port side, FIG. 1B is a cross-sectional view from the side, and FIG. Is a view as seen from the mounting flange side. FIG. 2 is a diagram for explaining an attached state of the blade.

The variable discharge diameter nozzle is used, for example, in a refuse incinerator to blow air or the like into the furnace.
Referring to FIG. 1 and FIG.
A cylindrical main body 1 and a plurality of, for example, eight, which are provided so as to be tiltable toward the axis along the inner periphery near the discharge port 2 of the main body 1
Blades 3, a connecting arm 4 one end of which is rotatably engaged with the blade 3, and an operating rod axially extending inside the main body 1 with one end of the connecting arm 4 rotatably engaging the other end of the connecting arm 4. 5 and operation stick 5
6 as a driving means for driving the shaft in the axial direction
It is composed of

A pipe 7 for sending air (see arrow A in FIG. 1) is connected to the center of the main body 1, and the air sent from the pipe 7 is blown out of the discharge port 2 through the inside of the main body 1.

As shown in FIG. 1, the blade 3 is composed of a substantially rectangular main body 3A and an extended portion 3B formed by bending one side end of the main body 3A. The extension portions 3B are sequentially arranged so as to overlap with the main body portion 3A. The blade 3 has a base end attached to the blade mounting seat 8 with a hinge 8a, and is rotatable about the hinge 8a as a pivot (see arrow B in FIG. 2). A hinge 3a is formed on the side surface of the blade 3 on the axial center side, and one end of the connecting arm 4 is engaged with the hinge 3a. A hinge 5a is also formed at one end of the operation rod 5, and the other end of the connecting arm 4 is engaged with the hinge 5a.

A mounting flange 9 for movably supporting the operating rod 5 is detachably attached to the main body 1 with a bolt or the like on the base end side of the main body 1. The other end of the operation rod 5 passes through the center opening of the mounting flange 9, and a plug 10 for supporting the operation rod 5 is inserted into the center opening. The mounting flange 9 and the above-mentioned blade mounting seat 8 are
The stays 11 are connected to each other by, for example, four stays 11 that are inserted therein, and the stays 11 are welded to the mounting flange 9 and the blade mounting seat 8, respectively. Therefore, the mounting flange 9 and the blade mounting seat 8 can be easily removed from the main body 1 by removing the bolts and the like, so that, for example, the blade 3, the connecting arm 4, etc. mounted on the blade mounting seat 8 can be easily replaced. can do. Therefore, the maintainability of the nozzle is improved.

Further, the stay 11 is provided with a guide 12 for guiding the movement of the operating rod 5 in the axial direction toward the discharge port 2 slightly in the center of the main body 1.

A lever 6 is engaged with the other end of the operating rod 5 by a bolt 6a. The lever 6 has a mounting flange 9
Is supported rotatably around a support shaft 6b formed at one end of a support rod 13 provided at the other end. A pin 6c formed at one end of the lever 6 is movably fitted into an arc-shaped hole 14a formed in a support piece 14 provided on the mounting flange 9. With the rotation of the lever 6, the operation rod 5 is moved in the left-right direction. The lever 6 may be rotated manually, for example, or may be rotated electrically, pneumatically, or hydraulically.

A seal member 15 is inserted between the mounting flange 9 and the operation rod 5 to improve airtightness.

Next, a state in which the opening area of the discharge port 2 changes with the above configuration will be described. FIG. 1 described above shows a state in which the discharge port 2 is open. In this case, the operation rod 5 is held by the lever 6 in the discharge port direction. Thereby, the blade 3 is connected to the main body 1 by the connecting arm 4.
Is held substantially parallel to the inner peripheral surface of the discharge port 2 so that the opening area of the discharge port 2 is maximized.

FIG. 3 shows a state where the discharge port 2 is narrowed. When the lever 6 is rotated about the support shaft 6b, the operation rod 5 is moved rightward, and accordingly the connecting arm 4 is pulled, and the tip of the blade 3 tilts in the axial direction of the main body 1. The blades 3 are arranged sequentially with the adjacent blades 3 and the extension 3B overlapping each other (see FIG. 1A), so that all the blades 3 are inclined, and the opening area of the discharge port 2 is small. Is done.

As described above, by moving the operation rod 5, the opening area of the discharge port 2 can be easily changed. Therefore, the flow velocity of the air passing through the discharge port 2 can be easily adjusted regardless of the flow rate, and the flow velocity of the air passing through the discharge port 2 can be kept constant. Further, unlike the related art, it is not necessary to replace the tip metal of the nozzle each time according to the flow rate, so that the incineration operation can be performed efficiently without stopping the furnace.

Further, according to the above-mentioned nozzle having a variable discharge port, the connecting arm 4 and the operating rod 5 for changing the opening area of the discharge port 2 are all housed in the main body 1.
Therefore, as compared with the valve described in the gazette described in the section of "Prior Art", the external shape is not increased, so that no space is required for installation.

FIG. 4 is a block diagram showing an example of a refuse incinerator system to which the present variable discharge diameter nozzle is applied. This refuse incinerator system is for sending air sent from an air source to a refuse incinerator F at an appropriate flow rate by a discharge port diameter variable nozzle in order to efficiently incinerate the refuse.

According to FIG. 4, the air source 20 is connected via a pipe 22 to a plurality of nozzles 21 of variable discharge diameter (only two nozzles are shown in FIG. 4). A furnace temperature control air blower 23 for blowing air, a flow rate control damper 24 for adjusting a flow rate, and a flow rate sensor 25 for detecting a flow rate are connected in the middle of the pipe 22.

The furnace temperature control air blower 23 sends out the air blown into the refuse incinerator F through the pipe 22 through the discharge port diameter variable nozzle 21. A control motor 26 for controlling the flow rate control damper 24 is connected to the control motor 26, a temperature detector (TIC) 27 is connected to the control motor 26, and the temperature detector 27 is provided in the refuse incinerator F. A temperature sensor 28 is connected.

The flow sensor 25 has a flow detector 2
The control motor 30 for adjusting the flow velocity of the air discharged from the discharge diameter variable nozzle 21 is connected to the flow rate detector 29 for each nozzle 21.

The flow rate of the furnace temperature control air supplied into the waste incinerator F is determined in advance so that the waste is burned most efficiently depending on the temperature in the waste incinerator F. That is, when the furnace temperature is relatively low, the flow rate is reduced, and when the furnace temperature is high, the flow rate is increased.

According to the above configuration, the temperature in the incinerator F is constantly measured by the temperature sensor 28, and the temperature detector 27 gives a control signal to the control motor 26 based on the temperature. The control motor 26 controls the flow control damper 24 based on the control signal, and adjusts the flow flowing in the pipe 22.

Then, the flow rate actually flowing is detected by the flow rate sensor 25, and the flow rate detector 29 gives a control signal to the control motor 30 based on the flow rate data. The control motor 30 controls the driving of the lever 6 shown in FIG. 1 based on a control signal given from the flow detector 29. When the lever 6 is driven, the opening area of the discharge port 2 is changed. That is, when the flow rate is relatively large, the discharge port 2 is made large, and when the flow rate is relatively small, the discharge port 2 is made small.

In this manner, air is supplied from the discharge port diameter variable nozzle 21 into the refuse incinerator F at a constant flow rate in accordance with the flow rate to be sent. Therefore, it is possible to more efficiently and effectively keep the furnace temperature constant. Further, for example, if the flow rate is kept constant, the flow rate of the air supplied into the refuse incinerator F can be freely changed as needed.

The above-mentioned variable discharge nozzle 21 can be applied to, for example, a nozzle for blowing exhaust gas for furnace circulation.

Although the present invention has been described above, the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. . For example, as shown in FIG. 5, the blades 3 may be formed in a substantially trapezoidal shape, for example, and arranged without overlapping with the adjacent blades 3. In this way, there is an advantage that the flow rate of the air from the discharge port 2 can be kept constant, and there is no overlapping portion, so that the manufacturing process of the blade 3 can be facilitated.

In FIG. 1, eight blades 3 are provided, but the number is not limited to this. In short, any number can be used as long as the opening area of the discharge port 2 can be changed. Also,
Although four connecting arms 4 are provided for eight blades 3, the number is not limited to this number. This is because the blades 3 are sequentially arranged so as to partially overlap with the adjacent blades, so that, for example, even with one connecting arm 4, it is possible to sufficiently change the opening area of the discharge port 2.

[0033]

As is apparent from the above description, according to the present invention, the inclination of the plurality of blades with respect to the axis can be changed by moving the operating rod in the axial direction by the driving means. The area can be changed.
Therefore, it is possible to provide a nozzle having a variable discharge port diameter capable of easily adjusting the flow velocity of air or the like passing through the discharge port regardless of a change in the flow rate.

In addition, since it is not necessary to replace the metal fittings at the tip of the nozzle depending on the flow rate as in the related art, it is possible to efficiently perform incineration work and the like. Further, since all the components for changing the opening area of the discharge port are housed in the main body, the outer shape of the nozzle is not increased and no space is required for installation.

Further, since the blades may be arranged sequentially with a part of the blades overlapping with the adjacent blades, the opening area of the discharge port can be sufficiently changed by the overlapping portion, and the airtightness can be improved by the overlapping portion. Is maintained, the flow velocity of air or the like can be changed with high accuracy.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a discharge port diameter variable nozzle of the present invention, wherein (a) is a view from the discharge port side, (b) is a cross-sectional view from the side, and (c) is a view from the mounting flange side.

FIG. 2 is a diagram for explaining an attached state of a blade;

FIGS. 3A and 3B show a discharge port diameter variable nozzle when the discharge port is narrowed, where FIG. 3A is a view from the discharge port side and FIG. 3B is a cross-sectional view from the side.

FIG. 4 is a configuration diagram of a refuse incinerator system to which a discharge diameter variable nozzle is applied.

5A and 5B show a modified example of the blade, wherein FIG. 5A is a view showing a state where the discharge port is open, and FIG. 5B is a view showing a state where the discharge port is narrowed.

FIG. 6 is a configuration diagram of a conventional nozzle.

7 (a) is a schematic longitudinal sectional view, FIG. 7 (b) is a longitudinal sectional view near the upper part of FIG. 7 (a), and FIG.
b-b Sectional view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Discharge port 3 Blade 4 Connecting arm 5 Operation rod 6 Lever

Claims (2)

[Claims] 1. A cylindrical main body, a plurality of blades provided to be tiltable toward an axial center along an inner periphery near a discharge port of the main body, and one end rotatably engaged with the blade. A connecting arm, an operating rod that rotatably engages the other end of the connecting arm with one end and extends in the main body in the axial direction, and a driving unit that moves the operating rod in the axial direction. A nozzle having a variable discharge diameter. 2. The nozzle according to claim 1, wherein the blades are arranged sequentially with a part of the blades overlapping with the adjacent blades.