BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a solenoid valve, and more particularly to an operating structure of a pilot-operated solenoid valve.

2. Description of the Prior Art

In a pilot-operated solenoid valve, when energized, a valve stein is lifted by the electromagnetic force of the solenoid valve to open a pilot valve orifice. At this time, the pressure in the upper chamber of the solenoid valve is relieved through a pilot hole, forming a differential pressure around a spool valve. Under the action of the pressure difference, the fluid pressure pushes the spool valve upward to open a main valve orifice. When the power is off, under the action of the spring force and the gravity of the spool valve, the valve stein is returned, the pilot hole is closed, the spool valve is moved downward, and the main valve orifice is closed. The pressure in the upper chamber of the solenoid valve increases, and the fluid pressure pressurizes the spool valve for better sealing.

Pilot-operated solenoid valves are widely used for induction faucets in the bathroom and kitchen as important actuators. However, when in use, in the case of a circuit failure, coil failure, no power supply, etc., the solenoid valve will not be actuated normally, which will cause inconvenience to the user. In view of this, the pilot solenoid valve is provided with a knob as a manual operating structure. The knob is rotated to open and close the pilot hole without energizing to indirectly open and close the main valve orifice. Existing pilot-operated solenoid valves are usually installed under the basin, and the operating space is limited. The knob further increases the difficulty of operation, especially when the knob is turned outward, it will further decrease the operation space, resulting in difficulty in operation.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide an operating structure of a pilot-operated solenoid valve, which can restrain the knob from being displaced relative to the pilot-operated solenoid valve during rotation, so as to achieve the purpose of simple operation.

In order to achieve the above object, the present invention adopts the following technical solutions:

An operating structure of a pilot-operated solenoid valve is provided. The pilot-operated solenoid valve includes a valve body having a main valve orifice and a pilot valve orifice. Opening and closing of the pilot valve orifice guides opening and closing of the main valve orifice. The valve body is formed with an accommodating chamber. The pilot valve orifice communicates with the accommodating chamber. The operating structure includes a knob, an adjustment rod, and a water stop nut. The knob is positioned and fitted to an opening of the accommodating chamber. The adjustment rod is hermetically fitted in the accommodating chamber. A first end of the adjustment rod is threadedly connected to the knob. A second end of the adjustment rod is connected to the water stop nut. The adjustment rod is movable along an axial direction of the accommodating chamber with rotation of the knob to drive the water stop nut for opening and closing the pilot valve orifice to control the opening and closing of the main valve orifice.

Preferably, the knob has a protruding portion. The protruding portion faces the adjustment rod. The protruding portion is formed with a screw hole for the adjustment rod to be screwed therein. The first end of the adjustment rod is screwed in the screw hole.

Preferably, an annular flange protrudes from the opening of the accommodating chamber toward the knob. The knob is sleeved on the annular flange. The protruding portion is inserted in the annular flange and is positioned by a limiting buckle.

Preferably, the annular flange is formed with an insertion hole for the limiting buckle to be movably fitted therein. The insertion hole passes through an inner wall of the annular flange. An outer periphery of the protruding portion is formed with an insertion groove for the limiting buckle to be fitted therein. The limiting buckle is inserted into the insertion hole and fitted in the insertion groove to restrain the knob from moving in the axial direction of the accommodating chamber.

Preferably, an outer periphery of the adjustment rod is formed with a limiting block. A side wall of the accommodating chamber is formed with a limiting groove. The limiting block is engaged with the liming groove to restrain rotation of the adjustment rod in the accommodating chamber

Preferably, at least one sealing ring is sleeved on an outer periphery of the adjustment rod. The sealing ring is movably and hermetically fitted between the outer periphery of the adjustment rod and a side wall of the accommodating chamber.

Preferably, the at least one sealing ring includes two sealing rings.

Preferably, the valve body is provided with a water quality monitoring device for detecting water quality of water passing through the valve body and sending a water quality signal.

After adopting the above technical solutions, the knob of the present invention is rotatably positioned and fitted at the opening of the accommodating chamber. The rotation of the knob drives the adjustment rod to move the water stop nut to open or close the pilot valve orifice, so that the rotation of the knob no longer generates displacement, which is convenient for operation and more suitable for the limited space under the basin. In addition, the present invention does not require a complicated mechanical connecting structure, has a simple structure, is easy to install, is more suitable for the improvement of the existing structures, and reducing the cost of improvement.

In addition, the water quality monitoring device can detect the quality of the water source in real time to ensure the health of users.

