KR19990075464A - Gas flow direction control valve of combustion device - Google Patents

Abstract

The present invention relates to a gas flow direction control valve of a gas combustor, the bracket being mounted to its body and fixed with a tubular sleeve (14), and a valve body (10) for sealing a gas flow passage communicating with a gas supply source. Gas flow direction control for a gas combustor having a plunger 19 having an upper end thereof, and a solenoid valve 3 having a coil assembly mounted on an outer side of a bracket for generating a magnetic force that lowers the plunger when energized. In the valve, a magnetic force control means is provided in the gap between the sleeve 14 and the inner diameter portion of the coil assembly 16 so as to increase the initial lowering speed of the plunger 19 while opposing the plunger at the end of the lowering. And a solenoid valve 3 configured to decelerate by applying a magnetic force in a direction, so that the response of the plunger is quicker, and the plunger As the deceleration of the lowering stroke in the end has the effect of preventing damage to the plunger, and the noise reduction by the impact of the buffer means.

Description

Gas flow direction control valve of combustion device

The present invention relates to a directional control valve for controlling gas flow for a combustion device using gas, and in particular, to improve the plunger operating characteristics to selectively open and close the gas flow passage of the directional control valve, thereby causing noise, damage to components, and A solenoid valve having improved operation inaccuracy is provided.

In general, gas combustion apparatuses such as furnaces, ovens, boilers, etc., which use gas as a fuel source, are provided with directional control valves for opening and closing gas flows as needed. Such directional control valves have gas flow passages when the combustion apparatus is used. Electronically operated solenoid valve is built in for opening.

One example of a conventional gas directional control valve having such a structure is shown in FIG. The directional control valve 1 shown in the figure is provided with a solenoid valve 3 at a position adjacent to an inlet 2 communicating with a gas supply source (not shown in the figure) to open the passage 4 to allow gas flow. Operated only when necessary, the passage 4 is provided with a governor valve 6 between the outlets 5 in communication with the combustion section of the gas combustor (not shown in the figure). The governor valve 6 includes a pressure adjusting screw 7, a diaphragm 8, and a valve body 9 fixed to the diaphragm so that the valve body 9 is kept open under a predetermined pressure. To prevent safety accidents. The solenoid valve 3 has, for example, a cam 12 for operating the push rod 11 in contact with the valve body 10 on the upper part of the plunger so as to operate the plunger by manual operation when the electricity supply is interrupted. A provided shaft 13 is provided.

The conventional solenoid valve (3) has a tubular sleeve (14) of the directional control valve (1) and a bracket (15) mounted on the body, and a magnetic field formed on the outside of the sleeve (14) of the non-conductor It comprises an annular coil assembly 16 for generating a magnetic force by the cover, and a cover 17 fixed to the bracket to press-fix the coil assembly to the bracket. When a current flows through the terminal 18 of the coil assembly, a magnetic field is formed in the coil, and the magnetic force causes the plunger 19 of the conductor to receive downward force. As a result, the plunger is moved downward to move the sleeve of the bracket 15 ( As shown in FIG. 1, the valve body 10 at the top of the plunger is separated from the state in which the valve body 10 is hermetically adhered to the valve seat 20 and the passage 4 is opened as shown in FIG. 1. The sleeve 14 is provided with a cushioning means 21 for mitigating the impact during the retreating stroke of the plunger 19 as shown in the cross-sectional view in FIG. 1 and the current is not supplied to the coil assembly 16, that is, combustion When the gas supply is cut off when the device is not used, the spring 22 is provided as an actuator that exerts an upward force on the plunger 19 such that the valve body 10 comes into close contact with the valve seat 20.

However, when the solenoid valve 3 is energized, the operation characteristic of the plunger 19 is, as indicated by the graph (A) of FIG. 5, the stroke distance from the lower end of the plunger to the buffer means when the valve body is in close contact with the valve seat d. ) Downward magnetic force acts on the plunger and the magnetic force that continues to be applied even during the lowering of the plunger increases and excessive shock occurs as the plunger hits the cushioning means in an accelerated state and stops, resulting in increased noise and fatigue of parts. There is a problem in that the durability is reduced and the device life is shortened eventually. In addition, the coil assembly may not be held firmly with respect to the bracket due to the clearance due to the assembly tolerance with the sleeve, so that the position of the coil may change slightly, which may adversely affect the downward movement of the plunger due to the change in the direction and magnitude of the magnetic force. There was a problem that the operation reliability of the valve was lowered.

The present invention in the above-described directional control valve by using a gas combustion device to generate a magnetic force to lower the plunger to prevent the plunger from being excessively impacted when the valve body is separated from the seat to reduce the impact noise with the buffer means and plunger And a means for controlling the magnetic force applied to the plunger when the coil assembly is energized so as to prevent damage by the shock absorbing means and the spring.

1 is a schematic cross-sectional view of a gas flow direction control valve of a conventional combustion device.

Figure 2 is an exploded perspective view of the solenoid valve of Figure 1;

3 is an exploded perspective view of a solenoid valve according to the present invention.

4 is a cross-sectional view of a gas flow direction control valve for a combustion device employing the solenoid valve of FIG.

Figure 5 is a graph showing the plunger operating characteristics of the solenoid valve according to the present invention in comparison with the plunger operating characteristics of the conventional solenoid valve.

In order to achieve the above object, the gas flow direction control valve of the combustion apparatus according to the present invention is mounted on its body and has a bracket on which a tubular sleeve of a non-conductor is fixed, and a valve body for sealing a gas flow passage communicating with a gas supply is provided at the top. A solenoid valve having a plunger and a coil assembly, which generate a magnetic force that lowers the plunger when it is energized, and which are mounted on an outer side of the sleeve of the bracket, wherein the magnetic force control means is spaced vertically apart from the gap between the sleeve and the inner diameter of the coil assembly. And a solenoid valve configured to decelerate by providing a magnetic force in an opposite direction to the descending plunger.

Preferably, the inner diameter portion of the coil assembly is provided with a stop member protruding inward to hold the magnetic force control means apart. In addition, the magnetic force control means is arranged two spaced apart conductive metal tubes are induction magnetic field is generated when the current flows in the coil to form a magnetic field to increase the magnetic force acting on the plunger in the opposite direction between two adjacent tubes The magnetic force acts to reduce the magnetic force acting on the plunger, thereby reducing the downward movement of the plunger by the magnetic force. Preferably, the upper conductive metal tube of the magnetic force control means protrudes from the upper surface of the coil assembly so that the coil assembly is firmly fixed to the bracket when the cover is fixed.

Hereinafter, the present invention will be described in more detail with reference to embodiments of the present invention.

3 and 4, the solenoid valve 3 included in the gas flow direction control valve 1 according to the present invention is shown in an exploded view. In the gas flow direction control valve (1), the other configuration and operation except for the solenoid valve are the same as those shown in FIG. use. The solenoid valve 3 according to the present invention has a bracket 15 fixed to the body of the directional control valve and a coil assembly 16 which is concentrically fitted to the outside of the tubular sleeve 14 of the non-conductor fixed to the bracket. And two annular conductor metal tubes 30 and 31 disposed up and down in a gap formed between the outer side of the sleeve 14 and the inner side of the coil assembly to control the magnetic force generated by the coil assembly. Magnetic force control means, and a cover 17 for firmly fixing the coil assembly 16 to the bracket 15.

The two annular conductor metal tubes 30 and 31 of the magnetic force control means are spaced apart from the gap between the sleeve and the coil assembly, preferably a plurality of protruding inwards at the central point of the inner diameter of the coil assembly 16. It is supported by the stop member 32.

As such, the annular conductor metal tubes are spaced apart between the coil assembly 16 and the sleeve 14 of the bracket 15 so that a magnetic field is formed when a current is supplied to the coil, and at the same time, the conductive metal tubes are also induced. A magnetic field is formed. Accordingly, the magnetic force by the coil assembly 16 and the conductive metal tubes 30 and 31 acts on the plunger 19 so that the plunger is lowered, and when the lower end of the plunger 19 is drawn into the upper conductive metal tube 30, the coil It is decelerated by the magnetic force acting in the opposite direction to the magnetic force by the assembly, and as the lower end of the plunger is adjacent to the conductive metal tube 31 in the lower direction in which the magnetic force in the opposite direction is formed, the upper portion of the plunger is formed. The magnetic force in the opposite direction to the conductor metal tube 30, that is, the direction in which the plunger is lowered, acts by the lower conductor metal tube to increase the plunger lowering speed again.

Thus, the effect of the conductive metal tubes 30 and 31 on the descending speed of the plunger 19 is shown in the graph (B) of FIG. In the graph, the horizontal axis indicates the descending distance of the plunger, the vertical axis indicates the strength of the magnetic force, and the horizontal axis indicates that the valve body 10 is sufficiently separated from the valve seat 20 to open the gas flow passage 4 in the solenoid valve. This is the distance the plunger 19 descends and is typically 2.5 mm.

5 is a graph (A) of the conventional solenoid valve showing the strength of the magnetic force of the coil assembly to the plunger with respect to the plunger falling distance, and the falling distance of the plunger appearing in the solenoid valve having a magnetic force control means according to the present invention. A graph showing the strength of the magnetic force is shown in contrast. As can be seen from this, since the magnetic force acting on the plunger at the initial position acting on the plunger according to the present invention, that is, the lower end of the plunger is 2.5 mm apart from the conventional case, a rapid descending of the plunger is achieved, After the valve body is separated from the valve seat, the magnetic force is reduced to reduce the impact when the plunger stops. In the conventional coil assembly, a relatively lower magnetic force is applied at the initial position of the plunger to lower the plunger. It starts slowly and becomes the maximum at the stop, and the impact is large at the stop, causing deformation of the buffer means for stopping the plunger and damaging the plunger, which shortens the life of the device and increases the noise.

In addition, according to the present invention, the upper metal tube 30 is disposed slightly higher than the upper surface of the coil assembly 16, so that the upper metal tube 30 is fixed when the cover 17 is fixed to the bracket on the coil assembly. It is pressed by the cover, and finally, the coil assembly 16 is firmly fixed to the bracket, thereby obtaining the effect of eliminating the problems caused by the play of the conventional coil assembly.

According to the present invention, the responsiveness of the plunger is quicker by the magnetic force control means arranged by separating the two metal tubes of the conductor between the coil assembly and the sleeve of the bracket, and as the speed decreases at the end of the lower stroke of the plunger, It is effective in preventing damage to the plunger and reducing noise by impact.

Claims (2)

A plunger mounted on the body and having a tubular sleeve fixed thereon, a plunger provided with a valve body at the top for sealing a gas flow passage communicating with the gas supply source, and a non-conductor fixed to the bracket while generating a magnetic force that lowers the plunger when energized. A gas flow direction control valve for a gas combustor having a solenoid valve having a coil assembly mounted outside the sleeve, the magnetic force control means being spaced vertically apart from the gap between the sleeve 14 and the inner diameter of the coil assembly 16. Is provided to increase the initial descending speed of the plunger 19, while at the end of the lower flow a solenoid valve 3 configured to decelerate by applying a magnetic force in the opposite direction to the plunger. Directional Control Valve. According to claim 1, wherein the magnetic force control means has two annular conductor metal tubes (30, 31) are spaced apart so that an induction magnetic field is generated when the current flows in the coil to form a magnetic field to the plunger 19 of the initial position A gas flow direction control valve of a combustor, characterized in that the magnetic force acting increases but the magnetic force acts in the opposite direction when the plunger is drawn into the lower tube 31 to reduce the downward movement of the plunger.