JPH045572U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a trochoid pump using an embodiment of the flow control valve according to the present invention with the cover removed, Fig. 2 is a sectional view taken along the - line of Fig. 1 with the cover attached, and Fig. The figure is a sectional view taken along the line -- in Fig. 1 with the cover attached, Fig. 4 is a longitudinal sectional view of the spool, Fig. 5 is a sectional view taken along the - line in Fig. 1 with the cover attached, and Fig. 6 is a sectional view taken along the - line in Fig. 1 with the cover attached. Figure 5 is a cross-sectional view showing a state where the inflow amount has increased from the state shown in Figure 6. Figure 7 is a cross-sectional view showing a state where the inflow amount has further increased from the state shown in Figure 6. Figure 8 is the pump rotation speed vs. discharge amount characteristic. Fig. 9 is a graph showing the relationship between the spool movement amount and the drain hole opening area, Fig. 10 is a partially enlarged view of another example of the spool, and Fig. 11 is a graph showing the relationship between the spool movement amount and the drain hole opening area of a conventional flow control valve. Graphs showing the relationship with the drain hole opening area, Figures 12 a, b, c and 1
3 are cross-sectional views showing conventional flow control valves. 8...Flow control valve, 12...Outflow port, 17
...Flow path, 17a...Inflow port, 82...Drain port, 81...Spool, 81a...Orifice (throttled part), 81b, 81c, 81d...
drain hole.

Claims (1)

[Scope of utility model registration request] A flow path having an inflow port and an outflow port arranged at both ends thereof, and a drain port arranged between these ports, and a flow path slidably provided in the flow path in the axial direction, and the inflow port and a cylindrical spool having a constriction portion that limits the flow rate from the inflow port to the outflow port to a predetermined amount or less, and the cylindrical spool has a cylindrical spool that controls the flow rate from the inflow port side to the The cylindrical spool is configured to move toward the outflow port side, and move from the outflow port side to the inflow port side as the inflow amount decreases, and a drain hole is formed through the peripheral wall of the cylindrical spool, and the drain hole is The drain port is closed by movement of the spool due to an increase or decrease in the inflow amount when the inflow amount is less than a predetermined amount limited by the constriction portion, and when the inflow amount exceeds a predetermined amount. In the flow control valve configured to be opened, a plurality of the drain holes are provided, and each hole is formed into a circular hole with the same diameter, and these holes have a diameter approximately 1.5 times the radius in the axial direction. A flow control valve characterized in that the valves are staggered at intervals of.