JPS6160313B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention adjusts the flow rate of fluid passing through a solenoid valve to at least one of a constant small flow rate corresponding to slow ignition and a large flow rate corresponding to normal combustion after ignition. This invention relates to a variable flow rate solenoid valve that switches in two stages.

(Prior art) Conventionally, when the gas burner was ignited at the same time as the main solenoid valve was turned on to ignite the gas burner, high pressure gas instantaneously passed through the governor and reached the gas burner nozzle. If the solenoid valve comes off and the gas is released, the gas fuse installed at the rear of the gas tank may operate and shut off the gas.In addition, if the solenoid valve is ignited with the solenoid valve fully open, the pilot may blow back when ignited. There is a risk that the main burner flame may be blown out or the gas may burn in the gas passage inside the burner, so as a preventive measure, slow ignition, i.e.,
At the time of ignition, the amount of gas supplied to the main burner is limited to a constant small flow rate corresponding to optimal ignition, but in this case, even if you try to secure this constant small flow rate with a variable flow rate solenoid valve for fuel adjustment,
Because it is difficult to maintain a constant flow rate even when the power supply voltage fluctuates, we ended up connecting a small-flow solenoid valve and a large-flow solenoid valve in parallel in the main burner's gas supply path, so that when ignition In this case, only the small-flow solenoid valve must be turned on to ensure a constant flow rate that corresponds to slow ignition, but in this case, two solenoid valves are required and the piping becomes complicated. Ta.

(Problems to be Solved by the Invention) The present invention enables the electromagnetic It is an object of the present invention to provide a variable flow rate solenoid valve that can switch the flow rate passing through the valve between a constant small flow rate and an arbitrarily large flow rate.

(Means for solving the problem) The present invention forms a valve seat in a valve hole in the middle of a fluid flow path that communicates a fluid inlet and a fluid outlet of a valve body,
A valve body that opens and closes the valve hole by the reciprocating movement of the plunger is attached to the tip of a plunger that reciprocates in a direction perpendicular to the plane of the valve seat through the attraction force of an electromagnetic solenoid and the urging force of a spring. The valve body is provided so as to be able to reciprocate over a preset distance between the valve body and the plunger, and the fluid inlet and the fluid flow are connected to the fluid inlet by the abutment and separation between the tip of the plunger and the valve body through relative movement with the plunger. The large diameter is formed to form an orifice for opening and closing communication between the outlets, and the large diameter part of the large diameter part of the punchjar is provided with a suction characteristic in which the suction force temporarily decreases at the time of initial suction. A stepped portion having a diameter smaller than that of the plunger is formed between the electromagnetic solenoid and the valve body, and the valve body is biased in the valve closing direction, and the plunger does not have the stepped portion. The variable flow rate solenoid valve is equipped with a conical spring whose spring characteristics match the suction characteristics of the electromagnetic solenoid.

(Example) Next, the configuration of an example of the present invention will be described with reference to the drawings.

A valve body 3 forming a fluid inlet 1 and an outlet 2
A guide cylinder 7 is attached to the bobbin 6 of the electromagnetic solenoid 5, which is fixed in a sealed state via a seal ring 4, through an O-ring 8 to a fluid flow passage 9 inside the valve body 3 while maintaining an airtight state. Case 1 that also serves as a yoke forming the magnetic path of the electromagnetic solenoid 29
A blind cover 11 made of ferromagnetic material is attached to the guide cylinder 7 in an airtight state through screws 12 and an O-ring 13, and a plunger 2 is installed inside the guide cylinder 7.
4 is attached to be able to reciprocate while being biased in the anti-suction direction via a spring 15, and the rear end of the plunger 24 in which the spring 15 insertion hole is formed is provided with A rubber buffer ring 16 is attached to absorb sound, and the tip of the large diameter portion of the plunger 24 is provided with a rubber buffer ring 16 to provide a characteristic that the suction force temporarily decreases during the initial suction of the plunger 24. A stepped portion 31 having a smaller diameter than the diameter portion is formed.

Further, as shown in FIG. 3, the valve seat 18 at the periphery of the valve hole 17 formed in the middle of the fluid flow path 9 of the valve body 3 is formed into a substantially rectangular shape by cutting off both the left and right sides of the disc. The small diameter of the plunger 24 between the flange 25 at the tip of the plunger 24 and the end surface of the large diameter portion of the plunger 24 is regulated in the axial direction by the flange 25 at the tip of the plunger 24 and the end surface of the large diameter portion of the plunger 24. A rubber movable valve 26 is mounted so as to be movable in the axial direction, and is movable back and forth in the valve opening/closing direction, and the center of the movable valve 26 comes into contact with the spherical surface of the lower surface of the collar 25, thereby blocking the flow. In other words, an orifice 27 is formed to ensure a constant small flow rate in response to slow ignition, and a variable flow rate protrusion 28 is formed on the lower surface of the movable valve 26, and an electromagnetic solenoid 29 is formed on the upper surface of the movable valve 26.
Between the lower surface and the lower surface, there is a suction characteristic of the electromagnetic solenoid 29 shown by the two-dot chain line A' in FIG. A conical spring 30 with spring characteristics is inserted into the fourth part of the plunger 24.
By lifting from point P1 to point P2 in the diagram, a constant small flow rate of fluid set for slow ignition can flow from the fitting gap between plunger 24 and movable valve 26 through orifice 27. As the plunger 24 descends when the electromagnetic solenoid 29 is not energized, the spherical surface of the tip of the plunger 24 comes into contact with the orifice 27 position of the movable valve 26, and the movable valve 26
When the lower surface of the electromagnetic valve 22 is in contact with the valve seat 18, the solenoid valve 22 blocks passage of the fluid through the flow path 9 (see FIG. 1), and the plunger 24 rises slightly to open the movable valve 26.
When the contact between the spherical surface of the tip of the plunger 24 and the orifice 27 is released while the contact between the lower surface and the valve seat 18 is maintained by back pressure, the fluid passes through the orifice 27 and flows through the flow path 9. (see FIG. 2), and this flow rate is set to a constant small flow rate corresponding to slow ignition of the gas burner.

Next, the operation of this embodiment will be explained.

First, in this embodiment, the electromagnetic solenoid 29
The attraction force characteristics of the plunger 24 due to excitation include the external shape and material of the plunger 24 and the blind lid 11, and in this embodiment, the attraction force is temporarily applied to the tip of the large diameter part of the plunger 24 during the initial attraction of the plunger 24. Since a stepped portion 31 having a smaller diameter than the large diameter portion is formed to provide a descending characteristic, the suction force of the plunger 24 is temporarily reduced during suction, as shown in FIG. It's set.

Therefore, the spring 1 in this attractive force characteristic
5 is the first half line of A' in Fig. 4, the operating voltage for the electromagnetic solenoid 29 is B in Fig. 4.
When the voltage is between the 1st line voltage and the B2 line voltage, the plunger 24 stops between the P1 point position and the P2 point position in FIG. The solenoid valve 22 maintains a constant small flow rate set for slow ignition between the B1 line voltage and the B2 line voltage in FIG. 4, which sufficiently exceeds the power supply voltage fluctuation range. Also, after ignition, the excitation voltage of the electromagnetic solenoid 29 can be set to B2 in FIG.
By setting the C voltage higher than the line voltage, the plunger 24 can be fully opened.

(Effects of the Invention) The present invention utilizes the tip of a plunger that reciprocates in the direction perpendicular to the valve seat surface at the periphery of the valve hole formed in the middle of the fluid flow path of the valve body, and the reciprocating movement of the plunger that is caused by turning on and off an electromagnetic solenoid. The valve body opens and closes communication between the fluid inlet and the fluid outlet by contacting and separating the orifice formed in the valve body that opens and closes the valve hole, and also opens and closes the communication between the fluid inlet and the fluid outlet of the valve body. A stepped portion having a smaller diameter than the large diameter portion is formed in the part to give the punja a suction characteristic in which the suction force temporarily decreases during initial suction, and the electromagnetic solenoid and the valve body Between,
The variable flow rate solenoid valve is provided with a conical spring inserted therein which biases the valve body in the valve closing direction and has spring characteristics matched to the suction characteristics of the electromagnetic solenoid when the plunger does not have the stepped portion.

As a result, the present invention can change the voltage applied to the excitation coil of the solenoid valve to any high voltage in two stages, high and low, with a preset voltage as the boundary, thereby increasing the flow rate of fluid passing through the solenoid valve. It has the effect of being able to easily change the flow rate from a constant small flow rate corresponding to slow ignition to an arbitrarily large flow rate.

[Brief explanation of the drawing]

1 and 2 are cutaway front views of one embodiment of the present invention, FIG. 3 is a sectional view taken along the line A--A in FIG. 1, and FIG. 4 is a diagram showing its operating characteristics. 1... Inflow port, 2... Outlet port, 3... Valve body,
9...Fluid flow path, 15...Spring, 17...
...Valve hole, 18... Valve seat, 22... Solenoid valve, 24...
... Plunger, 25 ... Tsuba, 26 ... Movable valve, 2
7... Orifice, 28... Valve body, 29... Electromagnetic solenoid, 30... Conical spring, 31... Stepped portion.

Claims (1)

[Claims] 1. A valve seat is formed in a valve hole midway through a fluid flow passage that communicates a fluid inlet and a fluid outlet of a valve body, and a valve seat is formed in a direction perpendicular to the plane of the valve seat through the attraction force of an electromagnetic solenoid and the urging force of a spring. A valve body that opens and closes the valve hole by the reciprocating motion of the plunger is provided at the tip of a plunger that reciprocates between the plunger and the plunger so that the valve body can reciprocate a preset distance between the plunger and the plunger. The tip of the plunger forms an orifice that opens and closes communication between the fluid inlet and the fluid outlet by abutting and separating the tip of the plunger and the valve body due to relative movement of the plunger, and the tip of the large diameter part of the plunger A stepped portion having a smaller diameter than the large diameter portion is formed in the part to give the punja a suction characteristic in which the suction force temporarily decreases during initial suction, and the electromagnetic solenoid and the valve body In between, a conical spring is inserted which urges the valve body in the valve closing direction and whose spring characteristics match the suction characteristics of the electromagnetic solenoid when the plunger does not have the stepped portion. Variable flow rate solenoid valve.