JPH0216133Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a fan air volume control device that controls the exhaust air volume of the fan to an air volume suitable for the type of gas such as LP gas or 6C gas.

[Prior Art] Conventionally, the exhaust air volume of a fan has been controlled by applying a tap to change the energization position to the winding of the fan motor in 2 to 3 steps, and by changing the tap position, the number of rotations is increased from 2 to 3. The air volume is switched in two to three stages.

[The problem that the idea aims to solve]

When changing the air volume by changing the rotation speed by changing the tap position of the motor, it is not possible to quickly and accurately switch the air volume in response to changes in the combustion capacity, and when the combustion capacity is small, there are differences in gas type. There was a problem in that it was not possible to appropriately adjust for minute differences in air volume due to

[Means to solve the problem]

In order to solve the conventional problems, this idea has an air volume control damper rotatably supported in the ventilation path of the fan, and the air volume control damper adjusts the air flow to a large or small amount depending on the gas combustion capacity. A rotatable receiving member bent in the shape of a crank is provided to stop the damper at a desired angular position in a small opening position so that the air flow can be adjusted finely to match the gas type at small capacity. In addition, the damper is associated with an operating rod that is moved forward and backward by the operation of an electromagnetic body provided outside the ventilation passage, and the operation of the electromagnetic body moves the operating rod back and forth to adjust the damper to a large or small opening, thereby instantly opening the fan. The exhaust air volume can be changed to a large or small air volume depending on the gas combustion capacity, and the position of the damper receiving part of the receiving member can be changed to easily and quickly make fine adjustments to the air volume when the air volume is low. The purpose of the present invention is to provide a technical means by which the air volume can be adjusted to obtain an optimal combustion state depending on the type of gas, etc.

[Effect]

According to the above-mentioned structure of this invention, an air volume control damper (hereinafter referred to simply as a damper) that is pivotally supported in the ventilation path of the fan is pushed up against a spring by the excitation and adsorption action of an electromagnetic body. In addition, the fan's own wind force switches the damper from the maximum airflow position to the minimum airflow position to reduce the airflow, and when the electromagnetic body is not demagnetized, the elastic force of the spring pushes down the operating rod and pushes the damper, increasing the airflow from the minimum airflow position to the maximum. The air volume is increased by switching to the air volume position, and when the damper receiving part of the receiving member is set to an eccentric position, the minimum air volume position of the damper is displaced by rotation of the receiving member to finely adjust the air volume. It is.

〔Example〕

This invention will be explained below based on embodiments shown in the drawings. In Figures 1 and 3, 1 is a centrifugal Shirotsuko fan, 2 is an outlet of the Shirotsuko fan 1, and 3 is a damper for controlling air volume. The exhaust port 2 is rotatably supported on a fan case 11 with the damper 3 in a substantially horizontal state and with a slight gap between the outer end (left and right ends in the figure) and the fan case 11.
A pin-shaped receiving member 4 is provided to stop one end of the damper 3 at the minimum opening position A, and the other end of the damper 3 is held at the maximum opening position B, with the damper 3 in a substantially vertical position and the discharge port 2 almost fully open. A stopper pin 5 for receiving is provided. Reference numeral 6 denotes an electromagnetic body provided on the outside of the fan case 11, and the base end of an L-shaped operating rod 8 that presses the damper 3 is fixed to the upper end of the drive shaft 6a of the electromagnetic body 6. is brought into contact with the right-hand side portion of the damper 3, and the fan case 1
A spring 7 is interposed between the operating rod 8 and a mounting frame 9 fixed above the electromagnetic body 6 on the outer side of the electromagnetic body 6, so that the operating rod 8 is constantly biased downward.

The pin-shaped receiving member 4 of the damper 3 is bent into a crank shape as shown in FIG. As shown in FIG. 2, the rotation of the stop member 4 shifts the position of the damper bending receiving part 4a slightly upward in the horizontal direction from the axis, changing the position relative to the receiving part with the damper 3. The opening of the damper 3 is adjusted in accordance with the type of gas, the frequency of the fan motor, etc. to finely adjust the air volume. In addition, 4b is an adjustment shaft bent and formed at the tip of the receiving member 4, 12 in FIGS. 3 and 4 is a presser plate in which a groove 12a into which the adjustment shaft 4b is inserted is formed, and 10 is the presser plate. Set the damper 3 at an appropriate angular position using the adjustment shaft 4b using a set screw screwed into a screw hole drilled in the fan case 11 to which the plate 12 is attached, and manufacture the necessary number of presser plates 12 of a shape that matches the position. This is done in advance to accommodate differences in gas types and fan motor frequencies. Similarly, in order to be able to adjust the small opening position A continuously, as shown in FIG. It is sufficient that the holding plate 12' is press-fixed to the fan case 11. 4d is an index carved on the adjustment shaft 4b, and 13 and 13' are adjustment scales carved on the fan case 11.

[Effect]

When the gas amount is small and the capacity is small, the electromagnetic body 6 is excited and the operating rod 8 is raised and retracted against the elastic force of the spring 7. Since the wind speed on the right) is larger than on the inner circumference (on the left in the drawing), the damper 3 is rotated counterclockwise, and the lower left surface of the damper 3 comes into contact with the bent receiving part 4a of the receiving member 4, and the damper 3 is almost rotated. When it becomes horizontal, the opening is narrowed and the air volume required for low capacity can be obtained. When the gas amount is large and the capacity is large, the electromagnetic body 6 is demagnetized and the upper right side of the operating rod 8 is pushed down by the elastic force of the spring 7. At the final end, the damper 3 is moved to the angular position slightly before the vertical position. When the damper 3 receives a similar wind force and is positioned at the angular position, the opening degree of the damper 3 increases, and the air volume necessary for high capacity is obtained.
When adjusting the opening degree at low capacity, rotate the adjustment shaft 4b of the receiving member 4 to a predetermined angular position corresponding to 6C, LP gas, etc., and select the holding plate 12 corresponding to the angular position of the adjustment shaft 4b. Then, tighten the set screw 10 to fix the receiving member 4, or tighten the adjusting shaft 4.
In the case where the slide body 4c is fixed to b, the receiving member 4 is fixed by tightening the slide body 4c with a holding plate 12' after setting it at a predetermined angular position.

The above example shows a case in which the opening is not adjusted in the case of large-capacity combustion, where sufficient combustion air is obtained and good combustion is achieved, but it is also possible to configure a configuration in which fine adjustments are made in the same way as in the case of small opening. . In that case, the operating rod 8 may be fixed to the drive shaft 6a so that its axial position can be adjusted.

In the above embodiment, when the damper 3 is opened at a small opening, the electromagnetic body 6 receives the wind force in an excited state and retreats from the blade of the damper 3 whose rotation is regulated by the receiving member 4, and when the damper 3 is opened at a large opening, the electromagnetic body 6 Since is in a demagnetized state, there is no fear that the attracting pieces of the electromagnetic body 6 will be separated by wind force, and the excitation coil will not be burnt out.

[Effect of idea]

According to this invention, by the action of the spring when the electromagnetic body 6 is not activated or demagnetized, the opening degree of the damper in the fan ventilation path can be instantaneously and accurately changed to a large or small degree. In addition, it is possible to maintain the air-fuel ratio at a predetermined value by appropriately switching the air volume according to the type of gas such as LP gas or 6C gas, thereby maintaining the best combustibility and thermal efficiency.
Since it is composed of a spring electromagnetic body and a receiving member, it is easy to assemble and the control device can be downsized, resulting in a significant cost reduction. In addition, it is easy to check the fine adjustment position (angular position) on the adjustment axis.
This is advantageous for adjustment work.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the fan air volume control device of this invention, Fig. 2 is a sectional view of the main part showing the damper receiving position displaced, and Fig. 3 is a crank-shaped pin-shaped receiving member and the damper. Perspective view showing the relationship with the fourth
The figure is a side view showing the adjustment and tightening state of the receiving member, and FIG. 5 is a side view showing another embodiment of the adjusting means for the receiving member. DESCRIPTION OF SYMBOLS 1...Fan, 2...Discharge port, 3...Damper for air volume control, 4...Receiving member, 4a...Bending receiving part, 4b...Adjustment shaft, 5...Stopper pin, 6
...Electromagnetic body, 7...spring, 8...operating rod.

Claims (1)

[Claims for Utility Model Registration] A bending receiver that rotatably supports an air volume control damper 3 in the ventilation path of a fan 1, and that can be bent into a crank shape to receive the damper 3 at a desired angular position with a small opening. An electromagnetic body 6 is provided outside the ventilation path of the damper 3 for controlling air volume by rotatably supporting a pin-shaped receiving member 4 having a stop portion 4a and an adjustment shaft 4b bent at the tip thereof. The actuating rod 8, which is moved forward and backward by the spring 7, is brought into contact with the actuating rod 8, and the air volume control damper 3 is moved to a wide opening position and a water opening determined by the receiving member 4 by moving the actuating rod 8 back and forth due to the activation and inactivation of the electromagnetic body 6. A fan airflow control device that switches between The receiving member 4 for receiving the damper 3 is formed as a pin-shaped receiving member having a bent receiving portion 4a formed in a bent manner to receive the receiving related position between the bent receiving portion 4a of the receiving member 4 and the damper 3. A fan air volume control device according to claim 1, which is capable of being displaced by rotation of the member 4.