JPH0594640U - Damper with fine adjustment function of ventilation opening - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a blower capable of easily performing fine adjustment of the air flow rate of a centrifugal blower and shortening the burner combustion adjustment time. [Structure] A main damper 4 for adjusting the ventilation opening A is provided, a fine adjustment opening 4a is formed in the main damper 4, a sub damper 5 for opening and closing the fine adjustment opening 4a is provided, and the sub damper 5 is also provided. Is provided with engaging means for interlocking the main damper 4 after reaching the fully open position and the fully closed position of the fine adjustment opening 4a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a damper which is attached to a suction port or a discharge port of a centrifugal blower and used for adjusting a ventilation amount.

[0002]

[Prior Art]

 The ventilation volume of a centrifugal blower is generally adjusted by operating a damper attached to the suction port or discharge port of the blower and adjusting the area of the opening of the suction port or discharge port appropriately. Be seen. In particular, for blowers with a relatively low discharge pressure, a damper is provided at the suction port and the ventilation volume is adjusted by adjusting the area of the opening on the suction port side. For example, in a centrifugal blower for supplying combustion air to a burner of a simple boiler, a sliding damper 4 as shown in FIG. 3 is attached to a substantially circular suction port 2 side of a casing 1 by a pivot 6. By sliding the damper 4 along the side plate of the casing 1, the area of the opening A (bow-shaped portion) of the suction port 2 is adjusted. Further, a long hole 4d is formed on the mounting side of the damper 4 along an arc centered on the pivot 6, and the position of the damper 4 is fixed by tightening the set screw 7 in the long hole 4d. I am trying to do it.

By the way, in the above-described conventional suction port damper 4, the area of the opening A of the suction port 2 is increased by rotating the damper 4 around the pivot 6 in a state of sliding contact with the casing 1. Since it is an adjustment, it is difficult to finely adjust the ventilation volume of the combustion air supplied to the burner such as the boiler, and it takes a considerable time to adjust the combustion of the burner.

[0004]

[Problems to be solved by the device]

 In view of the above-mentioned problems, the present invention provides a damper that is finely adjusted by providing a main damper and a sub-damper in the ventilation opening and providing an engaging means with which the main damper is interlocked by the operation of the sub-damper The purpose is to

[0005]

[Means for Solving the Problems]

 That is, according to the present invention, a main damper for adjusting the ventilation opening is provided, a fine adjustment opening is formed in the main damper, and a sub-damper for opening and closing the fine adjustment opening is provided. It is characterized in that an engagement means for interlocking the main damper is provided after reaching the fully open position and the fully closed position of the working opening.

[0006]

[Action]

 According to this invention, the fine adjustment of the ventilation amount at the ventilation opening is performed by opening and closing the fine adjustment opening formed in the main damper through the sub damper, and when further increasing or decreasing the ventilation amount, the operation of the sub damper is performed. Since the main damper rotates together with the, the ventilation volume can be easily adjusted.

[0007]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a centrifugal blower according to the present invention in which a main damper 4 is attached to a suction port 2 of a casing 1. The same components as those in FIG. 3 are designated by the same reference numerals, and their detailed description will be given. Is omitted. As shown in FIG. 1, the present invention comprises a main damper 4, a sub-damper 5 and a pivot 6, and is mounted so as to cover a suction port 2 of a casing 1 of a centrifugal blower.

As shown in FIG. 1, the main damper 4 is formed by a thin plate having a substantially semi-circular shape, and a long hole-shaped fine adjustment opening 4a is formed at a predetermined position in the upper center portion. A first engaging portion 4b and a second engaging portion 4c are formed as engaging means for interlocking with the sub damper 5, respectively. As shown in FIG. 1, the sub-damper 5 is a battledore-shaped thin plate and has an operating portion 5a formed at the lower end thereof. The sub-damper 5 opens and closes the fine adjustment opening 4a formed in the main damper 4, and The main damper 4 is interlocked with the first and second engaging portions 4b and 4c formed in the above. The pivot 6, the casing 1, the main damper 4, and the sub-damper 5 are rotatably inserted at predetermined positions. Further, a long hole 4d is formed on the mounting side of the main damper 4 along an arc centered on the pivot 6, the sub-damper 5 is provided with a stop hole 5b, and the position can be fixed by a set screw 7 inserted into the casing 1. I am trying.

The operation of the damper with the fine adjustment function having the above configuration will be described with reference to a diagram (FIG. 2) showing the relationship between the opening amounts of the main damper 4 and the sub damper 5 and the ventilation amount. The ventilation amount of the centrifugal blower is adjusted by operating the operation portion 5a of the sub-damper 5 and interlocking the main damper 4 to appropriately adjust the area of the ventilation opening A of the suction port 2. That is, the area of the ventilation opening A shown in FIG. 1 is set to the opening X ₁ shown in FIG. 2, and when it is necessary to slightly increase the ventilation amount depending on the combustion state of the combustion device, the sub-damper 5 is operated clockwise. Then, the fine adjustment opening 4a is opened for adjustment. This adjustment is performed up to X ₂ along the curve R in FIG. 2. However, when it is necessary to adjust the ventilation amount beyond X ₂ , the operation portion 5a of the sub-damper 5 is connected to the first damper of the main damper 4. The main damper 4 can be opened and adjusted by contacting the joint portion 4b and operating clockwise. This adjustment is performed by the curve S shown in FIG. 2 and can be adjusted to, for example, the opening degree X ₃ .

Next, the opening X₃When adjusting the direction to further reduce the opening degree, the above procedure is performed in reverse order. That is, only the sub-damper 5 operates counterclockwise along the curve T shown in FIG. 2 to fully close the fine adjustment opening 4a (opening X_Four), But further opening X_FourWhen further reducing the air flow rate, the sub-damper 5 is operated counterclockwise and the main damper 4 is interlocked via the second engagement portion 4c of the main damper 4, and along the curve U, for example, the opening X ₁ Can be adjusted.

The present invention is not limited to the above embodiment, and the damper of the present invention may be attached to an end portion of a ventilation duct (not shown) or a ventilation opening in the middle to adjust the ventilation amount. it can. It is also possible to interlock the main damper 4 depending on the implementation even when the fine adjustment opening 4a is not completely opened and closed.

[0012]

[Effect of the device]

 According to this invention, the main damper is provided with a fine adjustment opening, and the opening and closing of the opening can be performed by finely adjusting the opening and closing of the opening. Therefore, the ventilation amount can be adjusted at any opening position of the main damper. It is possible to make fine adjustments and to open and close the main damper with the operation part of the sub-damper, which improves operability.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a damper with a function of finely adjusting a ventilation opening according to the present invention.

FIG. 2 is a diagram showing a relationship between an opening amount of a main damper and a sub damper of FIG. 1 and a ventilation amount.

FIG. 3 is a front view showing an example of a damper of a conventional centrifugal blower.

[Explanation of symbols]

 1 casing 2 suction port 3 discharge port 4 main damper 4a fine adjustment opening 4b first engaging portion 4c second engaging portion 5 sub-damper A ventilation opening

Claims (1)

[Scope of utility model registration request] 1. A main damper 4 for restricting and adjusting a ventilation opening (A) is provided, and a fine adjustment opening 4a is provided in the main damper 4.
And a sub damper 5 for opening and closing the fine adjustment opening 4a is provided, and after the sub damper 5 reaches the fully open position and the fully closed position of the fine adjustment opening 4a, the main damper 4 is interlocked. A damper having a function of finely adjusting a ventilation opening, which is provided with engaging means.