JPS6139556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas solenoid valve suitable for use in industrial and commercial gas combustion equipment.

Solenoid valves used in industrial and commercial water heaters, boilers, industrial furnaces, etc., especially when controlling gases that are difficult to ignite depending on the type of gas, initially supply a small amount of the gas necessary for combustion, resulting in 100% ignition after ignition. A solenoid valve that allows flow, that is, a slow-open type, is required. Additionally, solenoid valves that only turn ON and OFF usually close in a very short time, but in gas combustion equipment, especially industrial furnaces, where gas and air are mixed, the gas fire can be extinguished. Because of the problem of gas entering the pipe and causing backfire, a slow-shut type solenoid valve is required.

However, in conventional gas electromagnetic valves, as shown in FIG.
The valve body c is fixed to the plunger e of the solenoid, and the valve body c and the plunger e are fixed to the spring f.
The valve is pressed against the valve seat side by the coil g, and when the coil g is energized, the valve body is pulled away from the valve seat and opened by resisting the pressing force of the spring, so slow opening and slow shutter are possible. I had a problem where I couldn't do it.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a gas solenoid valve that is capable of slow opening and slow shutting, thereby preventing explosion accidents such as from backup fires.

The present invention includes a main body in which a valve chamber, two ports communicating with the valve chamber, and a valve seat are formed, a valve body provided in the valve chamber so as to be able to engage with the valve seat, a coil, a fixed iron core, and a valve seat. a solenoid assembly having a plunger connected to a valve body and moving the plunger and the valve body when the coil is energized; a spring that presses the valve body in a direction to engage the valve seat; In a gas electromagnetic valve equipped with a damper device attached to a body, the damper device includes an oil chamber filled with oil and separated from the valve chamber by a partition member, and a gas solenoid valve that is movable into the oil chamber. A piston with a through hole is provided and connected to the valve body through a rod extending through the partition member, and a piston is attached to an end of the rod on the oil chamber side to allow oil to flow through the through hole. A restricting baffle plate is provided to allow the piston to move relative to the rod over a predetermined distance to slow movement of the valve body in both the closing and opening directions.

In the above configuration, when the coil is not energized, the valve body is pressed against the valve seat by the spring and the valve is closed. When the coil is energized, the plunger is attracted to the fixed iron core, the valve body moves away from the valve seat, and the valve opens.
At this time, the flow of oil through the through hole is restricted by the closing plate, so the valve seat gradually opens. Next, when the power to the coil is stopped, the valve body is moved toward the valve seat by the spring, but at this time as well, the flow of oil through the through hole is restricted by the closing plate, so the valve gradually closes.

An embodiment of the gas electromagnetic valve according to the present invention will be described below with reference to the drawings.

In FIG. 2, the gas electromagnetic valve 1 of this embodiment includes a valve part 2, a solenoid assembly 4 for valve opening/closing operation attached to the upper side of the valve part 2, and a damper attached to the lower side of the valve part 2. It is composed of a device 6.

The valve part 2 includes a main body 20 in which a valve chamber 21, inlet and outlet ports 22 and 23 communicating with the valve chamber 21, and a valve seat 24 are formed, and a valve inserted into the valve chamber 21 so as to be able to engage with the valve seat 24. The body 30 and the valve body 30 are connected to the valve seat 24.
It is composed of a spring 35 that presses against the side.

The solenoid assembly 4 includes a plunger guide 40
A fixed iron core 41 fixed to one end and an end cover 42 attached to the other end of the plunger guide 40
The plunger 43 is movably inserted into the plunger guide 40, a coil 44 provided outside the plunger guide, and a frame 45 surrounding the coil 44. This solenoid assembly 4 has a part of the fixed iron core 41 inserted into the hole 2 of the main body 20.
It is fixed integrally with the valve part 2 by fitting and fixing it to the valve part 5.

A hole 46 passing through the fixed core 41 in the axial direction is formed, and a valve rod 47 having one end fixed to the plunger 43 is inserted into the hole, and the other end of the valve rod 47 is engaged with the valve body. It is designed so that the valve body can be pressed by pressing the valve body.

Note that 48 is a stopper for adjusting the stroke of the plunger which is screwed into the end cover 42.

Each end of a bellows 50 is fixed to the lower end of the fixed core 41 and the valve stem 47 to prevent gas from leaking between the valve stem and the fixed core.

The damper device 6 includes a damper body 60 that is attached to the lower part of the valve body 20 and that defines an oil chamber 61;
A partition member 62 that is attached to the upper part of the damper body 60 and partitions the valve chamber 21 and the oil chamber, a piston 63 that is movably inserted into the oil chamber 61 and has an orifice or through hole 64 formed therein, and the damper body It has a cover 65 that closes the lower end of 60.

A rod 67 whose upper end is fixed to the valve body 30 is movably inserted into the hole 66 penetrating the partition member 62 in the axial direction, and a piston 6 is attached to the lower end of the rod.
3 are fitted so that they can move relative to each other within a predetermined range. Ends of a bellows 68 are fixed to the partition member 62 and the rod 67, respectively, and the oil in the oil chamber 61 flows into the valve chamber 21 through the gap between the rod and the partition member.
I try not to let it flow inside.

Inside the oil chamber 61, there is a closing plate 70 adjacent to the piston.
is provided, and its closing plate is fixed to the end of the rod 67. When the closing plate 70 engages with the piston 63, it closes a through hole 64 formed in the piston and prevents oil from flowing between the upper and lower portions of the piston through the through hole.

In the gas solenoid valve configured as described above, when the coil 44 is energized to open the valve, the plunger 43 is attracted to the fixed iron core 41 and pulled down. Therefore, the valve body 30 is pushed down through the valve stem against the pressing force of the spring 35, and the valve body is separated from the valve seat to open the valve.
At this early stage of valve opening, the plunger 43, the valve stem 4
7 and the valve body 30, the closing plate 70, which is fixed together through the rod 67, moves within the oil chamber 61 while displacing the oil, moves a predetermined distance, and after the bellows attachment part hits the piston, the piston is moved. Since the valve moves along with the valve, it cannot descend rapidly, and therefore the valve opens gradually. In other words, open slowly.

Next, when closing the valve, when the current to the coil is cut off, the plunger 43, valve stem 47, valve body 30, and rod 6
7. The closing plate 70 and the like are pushed upward as a unit by the action of the return spring acting on the valve body, and the valve body abuts and engages the valve seat to close the valve.
When the valve body etc. moves upward, the closing plate 70 engages with the piston 63 and moves up with the piston, and the passage hole of the piston is blocked by the closing plate, thereby restricting the flow of oil. Due to this damper action, the valve body cannot rise rapidly and gradually rises, leading to the valve closing.
In other words, the valve slows down.

As is clear from the above explanation, the solenoid valve for gas according to the present invention can gradually open and close the valve, thereby preventing backfire into the gas pipe, which could not be prevented with conventional quick-open or quick-shut solenoid valves. It is possible to prevent this and also to completely ignite the gas.

Moreover, even when handling gases that are difficult to ignite, such as natural gas, it is possible to flow the small amount of gas necessary for ignition, which prevents explosive combustion from occurring and reduces the pressure inside the furnace. The generation of combustion vibration noise (due to the increase in gas flow being blocked) can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional solenoid valve, and FIG. 2 is a sectional view of a gas solenoid valve according to the present invention. 1: Gas solenoid valve, 2: Valve section, 20: Main body, 2
1: Valve chamber, 22, 23: Port, 24: Valve seat, 3
0: Valve body, 4: Solenoid assembly, 43: Plunger, 44: Coil, 6: Damper device, 60: Main body, 63: Piston, 67: Rod, 70: Closing plate.

Claims (1)

[Claims] 1. A main body in which a valve chamber, two ports communicating with the valve chamber, and a valve seat are formed, a valve body provided in the valve chamber so as to be able to engage with the valve seat, a coil, a fixed iron core, and a valve body. a solenoid assembly having a plunger connected thereto and moving the plunger and the valve body when the coil is energized; a spring that presses the valve body in a direction to engage the valve seat; and a spring attached to the valve body. In the gas solenoid valve, the damper device includes an oil chamber filled with oil and separated from the valve chamber by a partition member; A piston with a through hole connected to the valve body via a rod extending through the partition member, and a plug attached to the end of the rod on the oil chamber side to restrict the flow of oil through the through hole. 1. A gas electromagnetic valve, characterized in that the piston is configured to be relatively movable over a predetermined range with respect to the rod, thereby slowing the movement of the valve body in both valve-closing and valve-opening directions.