JPS61282682A - Feed air damper device of combustion apparatus - Google Patents

Abstract

PURPOSE:To decrease the generation of impact noise during operation of a damper, by a method wherein, independently from a spring through the resilient force of which a damper is forced into pressure contact with a valve seat, a spring for cushioning is provided for starting compression in the middle of suction motion of a shaft to exert a compression force on the shaft. CONSTITUTION:With an electromagnetic coil 43 excited through energization of a solenoid 41, a shaft 44 is attracted through the magnetic force of the electromagnetic coil, and a damper 46 is separated from a valve seat 37 against the resilient force of a spring 48. However, in the middle of the attraction motion of the shaft 44, namely, when the shaft is attracted about 2-3mm to the electromagnetic coil, a spring 50 for cushioning is forced into contact with a catch tool 49, and thereafter, the spring is started to the compressed. Mutual action between a compression force, producing the antiattraction force of the spring 50 for cushioning and the compression force of the main spring 48 causes absoption of film contact of the shaft 44 with a stopper part 45, resulting in a decrease in the generation of impact noise.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an air supply damper device for varying the amount of combustion air to a burner of an oil or gas combustor.

(b) Conventional technology A supply air damper device is well known in Japanese Utility Model Application Publication No. 55-6608 and Japanese Utility Model Application Publication No. 58-119.

Below, this type of conventional damper device will be explained based on Fig. 4. (1) is an air supply pipe constituting an air supply passage (2), (3)
(4) is a valve seat provided in the middle of the air supply passage (2), and (4) is a shaft (6) which is an iron core when the electromagnetic coil (5) is excited when energized.
) and separates the damper (7) attached to its tip from the valve seat (3). (8) is the fixing plate of the solenoid (4) and the support member (9) fitted to the air supply pipe (1).
) is fixed with bis(IO). (The river is a solenoid (4
) is a coil spring that presses Dan/< 7 +71 against the valve seat (3) during demagnetization.

By the way, as shown in FIG. 5, the above-mentioned solenoid (4) has an attraction force that increases as the shaft (6) enters the electromagnetic coil Iv (5) as shown in the figure.
6) was completely suctioned, it strongly hit a part of the stopper (12), producing a loud impact sound.

In order to reduce this impact noise, if the elastic force of the spring (+1) is made stronger, it may not be possible to attract the electromagnetic coil/v1.
On the contrary, when demagnetizing the valve 51, the spring (river) is so strong that the damper (7) hits the valve seat (3) with great force, which increases the impact noise and also causes wear of the damper (7) and the valve seat (3). has significant drawbacks.

(c) Problems to be Solved by the Invention The present invention aims to reduce the impact noise that has conventionally been generated by simple means.

B) Measures to solve the problem In addition to the spring that presses the damper against the valve seat, the damper is equipped with a buffer spring that begins to be compressed during the suction operation of the shaft and applies that compressive force to the shaft.

(e) Action The buffer spring starts to be compressed during the suction operation of the shaft, and at that point a compression force that acts as a counter-attraction force is applied to the shaft, so at the moment the damper contacts the valve seat when the solenoid is demagnetized. Since the compressive force of the buffer spring is not applied, the damper does not come into strong contact with the valve seat and no impact noise is generated.

Furthermore, when the solenoid is energized, the compressive force of the buffer spring is applied to the shaft during the suction of the hammer 7, so that when the shaft abuts a portion of the stopper, the force is absorbed and impact noise can be reduced.

(F) Embodiment An embodiment will be described based on FIGS. 1 to 3. The device is a burner device for an oil combustor, and its configuration will be briefly explained below. - is a combustion chamber, r2υ is a rotary rotary in which oil is vaporized in the ground, and the vaporized gas and combustion chamber air are premixed, ejected at the burner head (231), and ignited and combusted by a spark plug (Incorporated). Gasification burner such as gasification burner, 4 is the supply air fan @2 and the motor that rotates the fuel atomizer (goods), (C) is the air supply case with built-in motor (B) and the air supply fan holder, and the holder is the air supply case. The fuel supply pipe is shown. (30) is the air supply hose. Next, the air supply damper device (B) will be explained. It is shown in detail in Figures 1 and 2. CQ is the air supply hose (30). ) The damper main cylinder that constitutes the air supply passage (P) is connected to the air supply port (to) of the wound area through a gasket.It is made of synthetic resin and has a cylindrical shape with both left and right ends open, and is used to supply air to the wound *- vinegar(
It is formed by forming a connecting cylinder part (end) of the bay. (7) is an air supply adjustment cylinder in which the flange part (to)' at one end is sandwiched between the packing (to) and the damper main part aυ, and has a cylindrical shape, and the other end is open (
The side (to) becomes the valve seat (b), and a small ventilation hole (to) is opened in the side wall. (G) is a support member made of resin that fits into the right end opening of the damper main cylinder c3η and is secured with a screw (6). ) The solenoid is stopped and installed, (the smell is the cylindrical electromagnetic coil of the solenoid circle,) is the electromagnetic coil /L/ (a solenoid shirt that is inserted into the center hole of the 4-pole and is attracted by the excitation of the electromagnetic coil), Part of the stopper that stops the end of the suction movement (+i is on the shaft), □□□ke shirt) (
It is a disc-shaped damper made of resin with the center fixed to the tip of 441, and a gasket (4η) that contacts the valve seat (B) is fitted on the outer periphery. (481 is a damper with a damper decoy attached to the valve seat (B). The main spring is a coil-shaped main spring that comes into pressure contact with the shaft and is interposed in a compressed state between the back surface of the damper and the back surface of the support member (G). (To) They are supported by support cylindrical decoys protruding from the back surface and can move smoothly. [9] is fixed on the outer periphery of the portion of the shaft (B) near the damper decoy. The attached stopper is a coil-shaped buffer spring wrapped around the outer circumference of the shaft (B) between the stopper (4) and the fixing plate (8), and the main spring (with a smaller diameter than the main spring (4), Furthermore, the length of the stopper and the fixing plate (6) is shorter than the dark dimension (S) when the power is not applied.

circle The elastic force of the buffer spring φQ is that of the main spring decoy.

It is stronger than that.

Then, the solenoid circle is energized and the electromagnetic carp /L/ (to)
When is excited, the shaft (4) is attracted by the magnetic force of the electromagnetic coil, and the damper decoy moves away from the valve seat (b) against the elastic force of the spring 4. During the suction operation of the product Q'i0), that is, when the shaft is pulled by the electromagnetic coil by about 2 to 3 mm, the buffer spring comes into contact with the stopper (49) and then begins to be compressed.Therefore, the buffer spring Q'i0) Due to the interaction of the compressive force that acts as a counter-attractive force and the compressive force of the main spring (4 fields), the strong contact of the shaft ← against the stopper part! 41i1 is absorbed and the impact noise is reduced. (See Figure 2) ) On the other hand, when the electromagnetic carp!V (c) is demagnetized, the main spring and the buffer spring (
50) Due to the action of the elastic force, the damper decoy moves in the opposite direction to the suction operation, and during the movement, the compression of the buffer spring is released, so when the damper decoy comes into contact with the valve seat, it is due to the weak elastic force of the main spring decoy. There is no impact noise or it is small.

The reason why the buffer spring (50) starts to be compressed during the suction operation of the shaft and applies the compressive force to the shaft (B) is that the suction force of the solenoid is @
This is because, as can be seen from Figure 5, the suction is weak at the beginning and becomes stronger midway through. In other words, at the beginning of suction, no compressive force is applied to ensure the initial suction operation, and when the suction force becomes strong, compressive force is applied in the direction to cancel the suction force, thereby absorbing the shock at the end of suction. This is what I did.

(g) Effect The present invention starts to be compressed during the suction operation of the shaft.
Since a buffer spring is provided to apply the compressive force to the shaft, at the beginning of suction, the suction operation is only against the weak compressive force of the main spring, and the damper is reliably moved away from the valve seat. Furthermore, the impact between the shaft and a portion of the stopper at the end of suction is absorbed by the compressive force of the buffer spring, thereby reducing the generation of impact noise.

On the other hand, when the damper contacts the valve seat during demagnetization of the solenoid, the compressive force of the buffer spring is not applied, so the contact does not occur with a strong force, and no impact noise is generated. Moreover, since the valve seat and damper do not come into strong contact, there are effects such as less wear on the valve seat and damper.

[Brief explanation of drawings]

1 and 4N2 are cross-sectional views of the air supply damper device of the present invention, with FIG. 1 showing the solenoid in a non-energized state, and FIG. 2 showing the solenoid in a energized state. ! ! FIG. 3 is a sectional view of a main part of a combustion device using the device of the present invention, FIG. 4 is a sectional view of a conventional device, and FIG. 5 is a characteristic diagram showing the relationship between the suction force of the solenoid and the stroke of the shaft. (41)... Solenoid, (c)... Electromagnetic: I,
(B)...Valve seat, 4 caps...Damper, Mouse...Main spring, ■...Buffer spring, (B)...Shaft. Applicant: Sanyo Electric Co., Ltd. and 1 other representative: Patent attorney: Makoto Sano Inu Figure 1 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] (1) A damper that opens and closes a valve seat provided in the air supply passage, a solenoid that is energized when energized and attracts the shaft to separate the damper from the valve seat, and a solenoid that moves the damper from the valve seat when the solenoid is not energized. An air supply damper device for combustion equipment, comprising a main spring that is brought into pressure contact with the shaft, and a buffer spring that begins to be compressed during the suction operation of the shaft when the solenoid is energized and applies the compressive force to the shaft.