JPH0134726Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a throttle device used in a hydraulic circuit or hydraulic equipment.

As a conventional diaphragm device, there is one shown in FIG. 1, for example.

This is done by forming an inlet passage 2 and an outlet passage 3 with a large cross-sectional area in the block 1, and an aperture 4 with a small cross-sectional area that communicates them, to adjust the flow rate Q of the fluid. , and the flow rate Q is 4
Since it is determined by the differential pressure between the inlet 4a and the outlet 4b, it is constant with the passage of time t, as shown in FIG. 2, and hardly changes.

However, there are cases where it is desired to cause the flow rate Q to pulsate at an appropriate frequency as shown in FIG. 3, and in such cases, for example, a throttle device having a configuration as shown in FIG. 4 has been used.

This throttling device consists of a control spool 7 which is biased by a spring 5 in a direction to close a fluid flow path 6.
is caused to vibrate minutely by a proportional solenoid 9 driven by an electric signal S from an amplifier 8, thereby causing pulsations in the flow rate Q.

Therefore, such a conventional throttling device requires an amplifier 8 and a proportional solenoid 9 to pulsate the flow rate, which is not only expensive but also requires a large installation space and is cumbersome to operate. There was a problem.

This invention was made with attention to such problems, and the purpose is to provide a restricting device that has a simple structure and can periodically vary the flow rate by utilizing the fluid flow itself. .

Therefore, in the diaphragm device according to this invention, a rotating body having irregularities formed on the outer peripheral surface adjacent to the outlet or inlet of the diaphragm is offset from the center line of the diaphragm and can be freely rotated by an axis substantially perpendicular to the flow path. Provided with a pivot on the
This rotating body is rotated in a fixed direction by the flow of fluid such as oil, so that the flow rate changes periodically.

An embodiment of this invention will be described below with reference to FIG. 5 and subsequent figures.

FIG. 5 is a longitudinal sectional view along the flow path direction showing a basic embodiment of this invention.

This throttle device 10 forms an inlet flow path 12 and an outlet flow path 13 at both ends of a block 11, and
In between, a throttle 14 with a reduced cross-sectional area of the flow path and a rotating body chamber 15 with an enlarged flow path are formed on the outlet 14b side thereof.

Inside this rotating body chamber 15, adjacent to the outlet 14b of the diaphragm 14, a rotating body 16 having irregularities formed on its outer circumferential surface is offset by Δx from the center line l of the diaphragm 14 and perpendicular to the flow path. It is rotatably supported by a shaft 17.

This rotary body 16 is made by partially flattening the outer peripheral surface of a disc-shaped or ring-shaped member as shown by imaginary lines in FIG. 6 along the axial direction at equal angular intervals. ) 16a and curved surface portions (convex portions) 16b are alternately formed at four locations.

In the throttle device 10 configured as described above, when fluid is made to flow in the direction of arrow A at a constant pressure from the inlet channel 12, it is throttled by the throttle 14, and the fluid flows through the outlet 14.
b and the outer peripheral surface of the rotating body 16, the flow is divided upward and downward of the rotating body 16 as shown by the arrow in FIG. Since it is biased downward by Δx, the flow rate q ₂ flowing upward of the rotating body 16 is larger than the flow rate q ₁ flowing downward (q ₂ > q ₁ ), thereby,
The rotating body 16 rotates in one direction as shown by arrow B.

Due to the rotation of this rotating body 16, the flat portion 16
a and the curved surface portion 16b alternately form the outlet 14b of the aperture 14.
6, the distance Δs between the tip of the outlet 14b of the throttle and the outer peripheral surface of the rotating body 16 changes periodically within the range of dimensions shown by δ in FIG. The throttling effect changes periodically, and the flow rate Q (Q = q ₁ +
q ₂ ) becomes a pulsating flow that changes periodically as shown in Figure 3.

FIGS. 7 and 8 show more specific structural examples of the diaphragm device according to this invention.

This diaphragm device 20 has an inlet flow path 22 and a diaphragm 24 formed in a diaphragm unit 21, and a rotary body 26 adjacent to the outlet 24b having irregularities formed on its outer peripheral surface, which is rotatably supported by a shaft 27. The throttle unit 21 is connected to the outlet flow path 23 and the rotating body chamber 25.
A cap 29 having an inlet hole 29a is integrally fitted thereinto.

As for the rotating body 26, a ball bearing 30 is fitted onto the shaft 27 as shown in the figure, and the outer peripheral surface of the outer race is provided with a flat part (concave part) and a curved part (convex part) as shown in FIG. They are formed and used alternately.

The operation of this diaphragm device is the same as that of the basic embodiment described with reference to FIG. 5, so a description thereof will be omitted.

Note that the shaft support structure of the rotating body, the uneven shape of the outer peripheral surface, etc. can be modified in various ways.

Next, an example in which the throttle device according to this invention is used in combination with a pressure compensating valve will be explained with reference to FIG.

The pressure compensating valve 40 has a pressure compensating piston 44 inserted into a sliding hole 43 formed between an inlet port 41 and an outlet port 42, and is biased by a spring 45 in the direction of opening a flow path. .

The throttle device 10 according to this invention (fifth
(shown with the same reference numerals as in the figure) is connected, and its outlet passage 13 is communicated with the spring chamber 46 of the pressure compensating valve 40 through the passage 51.

Thereby, the differential pressure between the inlet channel 12 and the outlet channel 13 of the throttle device 10 is kept constant by the pressure compensation valve 40.

By the way, when used at high pressure, the pressure compensation valve 4
If the inlet pressure PIN of 0 is, for example, 200Kgf/ ^cm2 , the inlet pressure Pm of the throttle device 10 is generally 5Kg.
f/cm ² , and the gap ε between the control orifice 47 and the sliding hole 43 and the piston 44 is 195 kg.
Since a differential pressure of f/cm ² acts, dirt, etc. in the oil is likely to get caught.

However, since the throttling device 10 according to this invention is used, the flow of the control fluid becomes a pulsating flow, which causes minute vibrations in the pressure compensating piston 44 and causes a dither effect. Irregular flow rate fluctuations due to dirt or clogging are prevented.

In each of the above embodiments, the rotating body is disposed adjacent to the outlet of the aperture, but the same effect can be obtained even if the rotating body is disposed adjacent to the inlet of the aperture.

As explained above, the aperture device according to this invention has a simple structure in which a rotating body with irregularities formed on the outer peripheral surface is provided adjacent to the aperture outlet or inlet.
The rotating body can be rotated by the fluid flow itself to generate a pulsating flow.

Therefore, if this throttle device is used in combination with a pressure compensating valve or the like, the dither effect produced by the pulsating flow can be used to prevent dust from getting caught or clogging.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view along the flow direction showing a conventional throttle device, Figure 2 is a line diagram showing its flow characteristics, and Figure 3 is a line diagram showing changes in flow rate when pulsating flow is generated. FIG. 4 is a sectional view showing an example of a conventional throttle device for generating pulsating flow.
FIG. 5 is a sectional view similar to FIG. 1 schematically showing a basic embodiment of this invention, and FIG. 6 is a plan view showing an example of the shape of the rotating body. 7 and 8 show a specific structural example of the aperture device according to this invention, FIG. 7 is a sectional view taken along line B-B in FIG. 8, and FIG. - It is a sectional view along the A line. FIG. 9 is a sectional view schematically showing an example of the use of the aperture device according to this invention. 10, 20... Throttle device, 12, 22... Inlet channel, 13, 23... Outlet channel, 14, 24... Throttle,
16, 26... Rotating body, 16a... Flat part (concave part),
16b...Curved surface part (convex part), 21...Aperture unit,
28...Case, 29...Cap, 30...Ball bearing, 40...Pressure compensation valve.

Claims (1)

[Scope of utility model registration request] Adjacent to the outlet or inlet of an aperture with a small cross-sectional area of the fluid flow path, a rotating body having irregularities formed on its outer peripheral surface is rotated by an axis that is offset from the center line of the aperture and substantially perpendicular to the flow path. A diaphragm device characterized by being freely pivoted.