JPH0338539Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an on-off valve in which an inlet is formed in the same direction as a valve opening.

Problems to be solved by conventional techniques and ideas Normally, an on-off valve has a valve body disposed on the inlet side of the valve port in order to generate a closing force by the pressure of the flowing fluid, and a valve body is disposed on the inlet side of the valve port. Formed in a plane perpendicular to the valve port, the fluid flows almost straight from the inlet to between the valve body and the valve port, then changes direction and passes through the valve port.
By making it flow towards the outlet,
Generally, the flow resistance is reduced by the valve body, but depending on the mounting location and piping, it may be necessary to install the inlet near the valve port and in the same direction. , in such a case,
The valve body is located in the middle of the fluid flow path,
After passing through the annular gap between the outer periphery of the valve body and the inner wall of the valve chamber, the fluid flows toward the valve port while constricting the flow path, creating a violent vortex along the valve port side surface of the valve body. This causes a large pressure loss, which can be suppressed to some extent by increasing the distance between the outer periphery of the valve body and the inner wall of the valve chamber. It is necessary to increase the size, which has the disadvantage of increasing the size.

Means for Solving the Problems As a means for solving the above problems, the present invention adopts a structure in which the inlet is eccentrically formed with respect to the valve port.

Functions and Effects of the Invention The present invention has the above structure, and since the inflow port is eccentric to the valve port, the fluid flowing in from the inflow port uniformly spreads over the entire annular space between the valve body and the inner wall of the valve chamber. Rather than flowing through the valve, it mainly flows through the part near the inlet and flows into the valve port in an almost oblique path, creating a strong vortex along the face of the valve body on the valve port side. This has the effect of reducing pressure loss due to the valve body.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 3.

In Fig. 1, reference numeral 1 is a valve box, and on the left side of its lower surface, an inflow cylinder 3 having an upwardly facing inflow port 2 is attached, as will be described in detail later. A valve port 5 facing the same direction as the inlet port 2 is formed above the inflow port 2 in the valve box 1.
The valve body 7 accommodated in the valve chamber 6 formed on the lower surface side is pushed in the valve closing direction by the elastic expansion force of the coil spring 9 installed between it and the spring receiver 8 formed in the inflow cylinder body 3. The valve rod 1 is energized and connected to the valve body 7.
0 is the solenoid 11 attached to the top surface of the valve box 1
The valve body 7 is connected to the plunger 12 of
The valve is opened by moving the valve downward against the elasticity of the coil spring 9.

As shown in FIGS. 2 and 3, the inflow cylinder 3 has a spring chamber 16 that accommodates the coil spring 9 on the upper side of its inner periphery, and a spring chamber 16 that accommodates the coil spring 9 on the lower side. The inflow cylinder 3 is attached with the spring chamber 16 aligned with the valve chamber 6, and the inflow port 2 is eccentric with respect to the valve port 5.

Note that the valve body 2 is connected to the outlet 20 side by energizing the closing release solenoid 22 when the fluid flows.
3 in the valve closing direction is moved backward, and the coil 26 of the actuator 25 is
A proportional valve 21 with a closing function is installed, which controls the flow rate by opening the valve port 27 to an opening degree proportional to the amount of current supplied when the valve is energized.

The on-off valve of this example has the above structure,
When the solenoid 11 is energized to push down the valve body 7 and open the valve port 5 as shown by the solid line in FIG. As shown in the flow path indicated by the arrow in FIG. A state in which the fluid flows into the valve port 5 in a substantially oblique path, and the inflow port 2 is formed in a plane perpendicular to the valve port 5, so that the fluid flows straight between the valve body 7 and the valve port 5. Therefore, the flow resistance due to the valve body 7 becomes small, and even though the inlet port 2 and the valve port 5 face the same direction, the valve body 7 is located in the middle of the flow path, and the flow path is blocked. As in the case where the liquid flows toward the valve port 5 while contracting, the generation of a strong vortex along the surface of the valve body 7 on the valve port 5 side is avoided, and pressure loss is suppressed to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a bottom view thereof. 1...Valve box, 2...Inflow port, 5...Valve port, 6...
...valve chamber, 7...valve body.

Claims (1)

[Scope of utility model registration request] A valve port is formed in the vicinity of the inlet of the valve box, facing substantially the same direction as the inlet, and is opened and closed by a valve body operating in a valve chamber provided on the inlet side of the valve port. An on-off valve characterized in that the inflow port is formed eccentrically with respect to the valve port.