JPS61105396A - Flow regulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate adjustment device of the type that uses a deformable elastic ring to adjust the flow rate by narrowing the passage by utilizing the overpressure of fluid acting on the ring. The purpose is to obtain a device with excellent characteristics without hysteresis.

A conventional flow rate regulating device of this kind is shown in FIG. 4. A through hole (2) formed in the center of the main body (1) of the device is provided with tapered portions (3) that have a circumferential corrugated shape and become smaller in diameter toward the tip. ), and an elastic ring (4) such as an O-ring is placed around each part (3) and supported by the main body (1). In this case, in the process of increasing the water supply pressure, the water flow flows through the ring (4).
The pressure in this part decreases by increasing the flow velocity between the ring (4) and each part (3), and a pressure difference is created between the high pressure applied to the outer periphery of the ring (4) on the opposite side from each part (3). (4) is drawn toward each part (3), and the ring (4)
The upper surface is crushed by the water supply pressure, and as a result, the ring (4) is pressed against each part (3) and narrows the passage gap (5) with the corrugated surface, thereby reducing the passing flow.
However, in the process where the water supply pressure recovers to the low pressure side, the elastic return of the ring (4) cannot keep up with the decrease in water supply pressure, which means that the ring placement surface ( 1a), and the expansion of the passage gap (5) is delayed, resulting in hysteresis in which the flow rate characteristic lines of the forward direction (a) and the return direction (b) deviate, as shown in Fig. 5. However, there was a major drawback.

The present invention aims to improve such conventional drawbacks, and as shown in FIG. 1, the present invention has a structure as shown in FIG. The auxiliary elastic rings (6) are arranged so that they are in contact with each other vertically, and the grooves (7) on the corrugated circumferential surface of the center M f3) are arranged so that the lower part, that is, the auxiliary elastic ring (6) side is closer to the upper elastic ring ( 4
The groove depth is continuously changed so that it becomes deeper than the ) side.

Note that in both this Figure 1 and the previous Figure 4, each part (3) is connected to the axis (8).
) is shown in which the set flow rate can be varied by advancing and retracting, but each part (3) may of course be of a fixed type.

According to the configuration of the present invention, during the flow rate adjustment operation, the elastic ring (4) is deformed in the same manner as the conventional product, and the passage gaps (4) between the ring (4) and each part (3) are 5) to obtain the desired flow rate.On the other hand, the auxiliary elastic ring (6) receives the same primary pressure as the ring (4), but the pressure inside the passage gap (9) between it and each part (3) The flow rate of water passing through the ring (4) is faster than the flow rate in the gap (5) on the ring (4) side.
Therefore, the silver amount ra+9+ is the groove (7) of each part (3).
) is deeper, making the gap wider than the gap (5). In other words, the auxiliary elastic ring (6
), the pressure difference between its outside and inside is not so large and the degree of deformation is relatively small, so it deforms while maintaining its own return force sufficiently.

The return elastic force held by this auxiliary elastic ring (6) is a force that tries to pull back the elastic ring (4), and therefore, in the process of recovering the water supply pressure to the low pressure side, the auxiliary elastic ring ( 6) closely follows the decrease in water supply pressure, and as a result, the elastic ring (4) returns quickly, as shown in Figure 2.
) can be obtained with good characteristics in which the flow rate characteristic line hardly deviates, and this has been confirmed through experiments.

The expansion and contraction of this auxiliary elastic ring (6) is performed by each part (3).
) is downstream of the ring (4) with respect to the elastic ring (
The elastic ring (4) is larger than the set flow rate in (4).
It does not become a loss resistance that obstructs the flow rate adjustment operation.

As described above, according to the present invention, it is possible to obtain a device having a simple structure and greatly improved flow characteristics compared to the conventional device.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a water pressure-current characteristic diagram of the same embodiment, Fig. 3 is an enlarged longitudinal sectional view of the same essential part, and Fig. 4 is a conventional example. FIG. 5 is a water pressure-flow characteristic diagram according to the conventional example, and FIG. 6 is a longitudinal sectional view of FIG. 4.
It is an enlarged sectional view of A. (1)...Main body (2)...Sn1 hole (3)...Each part (4)...Elastic ring (5)...Passing gap (6)...Auxiliary elastic ring (7 )···groove

Claims (1)

[Claims] A through hole formed in the center of the main body has tapered parts that have a circumferential waveform and become smaller in diameter toward the tip, and an elastic ring is placed around each part, and the deformation of the elastic ring by water supply pressure causes The passage gap between the ring and the core is adjusted to keep the flow rate constant, and an auxiliary elastic ring of the same shape as the elastic ring is provided below the elastic ring so that both are in contact with each other vertically, A flow rate adjusting device characterized in that the depth of the groove in the corrugated circumferential surface of the core is continuously changed so that the groove on the side of the auxiliary elastic ring is deeper than the side of the elastic ring.