JPH0718447B2 - Fluid oscillation element - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid oscillating element used for a jetting nozzle of a washing device or a sprinkler for washing dishes and a human body by jetting washing water.

2. Description of the Related Art A conventional oscillator is shown in FIG. This element is the supply channel 2
1, the supply nozzle 22, the side wall 2 on both the downstream side of the supply nozzle 22
3, 24, and claws 25, 26 provided at the end portions of the side walls and upper and lower output paths 27, 28.

In the above structure, the fluid flowing from the supply channel 21 is ejected from the supply nozzle 22. This jet is split by the pawls 25 and 26. If the jet flow is bent downward, a part of the jet flow is split by the lower pawl 25 and flows into the downstream vortex chamber, and the rotational energy and internal pressure of the lower vortex increase. On the other hand, the fluid in the upper vortex chamber flows out from the gap between the claw 26 and the jet flow and is guided to the output path 28 together with the jet flow. Therefore, the rotational energy of the upper vortex, the internal pressure, etc. are reduced, and the jet flow is coupled with the rotational energy of the lower vortex, the internal pressure, etc.
It is bent upward on the opposite side and flows out from the output path 28. The above states are repeated alternately, and oscillation is caused.

Problems to be Solved by the Invention In the above conventional oscillation element, the oscillation frequency is basically determined by the volume of the vortex chamber. In the case of incompressible fluid such as liquid, low frequency oscillation is performed. Particularly, it is very difficult to oscillate at low frequency in a small oscillating element used for a nozzle of a cleaning device.

Means for Solving the Problems In order to solve the above problems, a displacement wall surface that is displaced according to pressure is provided in a part of the vortex chamber portion that determines the pressure change of self-oscillation, and the vortex chamber volume changes during oscillation. With this structure, the volume change lengthens the oscillation period to enable low-frequency oscillation.

The jet flow injected from the supply nozzle of the action element is deflected by the rotational energy of the vortices generated in the vortex chamber on both sides of the vortex chamber and the difference in internal pressure. It In this jet flow deflection, a part of the jet flow is fed back in the vortex chamber portion, the rotational energy of the vortices on the left and right sides of the jet flow and the difference in internal pressure are alternately changed, and self-oscillation occurs. By delaying the internal pressure change at this time by the effect of the displacement wall due to the pressure, the time for switching alternately is lengthened and the self-oscillation cycle is lengthened.

Example An example of the fluid oscillating device of the present invention will be described below with reference to FIGS. 1 to 7.

In FIG. 1, the fluid oscillating device 1 has a laminated structure of an element substrate 2, an upper plate 3 and a packing 4, and a supply flow channel pipe 5 is attached to the element substrate 2.

FIG. 2 shows a flow path pattern formed on the element substrate 2,
6 is a supply channel, 7 is a supply nozzle, and the supply channel 6 is attached at a right angle to the supply nozzle. Reference numerals 8 and 9 denote vortex chambers located downstream of the supply nozzle 7 and having atmosphere communication ports 10 and 11 communicating with the outside. The downstream ends of the vortex chambers 8 and 9 form a throttle portion 12 serving as a fluid outlet. is doing. Reference numerals 13 and 14 denote left and right side walls provided on both sides of the downstream side of the throttle portion 12, and reference numeral 15 denotes an ejection port formed at the downstream opening end of the side walls 13 and 14. The side walls 13 and 14 have a divergence angle to some extent according to the purpose of using the jet flow.

FIG. 3 is a plan view of the upper plate 3 having a step 16 which forms a groove portion for preventing the packing 4 from being displaced.

FIG. 4 is a plan view of the packing 4, which has displacement wall surfaces 17 and 18 which are attached to a part of the left and right vortex chambers 8 and 9 or a position corresponding to the whole and are displaced by the internal pressure of the vortex chamber. .

FIG. 5 shows a cross section of the displacement wall surfaces 17 and 18 of the packing 4, and the displacement wall surfaces 17 and 18 have a thin structure with respect to the other parts of the packing 4.

6 and 7 show the operating state of the element, Fi is the main jet,
Fo is the jet flow and V _L .V _R is attracted by the main jet and the vortex chambers 8 and 9
It is a vortex that occurs inside. 7, 19 and 20 are the displacement wall surfaces 17 and 18.
Shows the state when is displaced by the vortex chamber pressure.

The operation based on the above configuration will be described.

The fluid that has flowed into the supply passage 6 is ejected from the supply nozzle 7 into the vortex chambers 8 and 9. This jet flow is deflected by the pressure difference between the left and right vortex chambers 8 and 9. Suppose now that the pressure in the left vortex chamber 8 is low and the pressure in the right vortex chamber 9 is high. In this case, the main jet Fi is deflected to the left and hits the left side of the throttle unit 12,
Further, it is adhered and deflected to the left side wall 13 of the output passage,
Eject from 15 (Fig. 6 Fo). At this time, a part of the flow that splits into the narrowed portion flows along the wall of the left vortex chamber 8 and the vortex V _L
To form. This vortex V _L gradually increases the pressure in the vortex chamber 8.

On the other hand, the fluid in the vortex chamber 9 on the right side is attracted to the jet flow and discharged together with the jet flow, and the pressure in the vortex chamber drops. When this pressure drop progresses and the right vortex chamber pressure becomes lower than the left vortex chamber pressure, the right side becomes lower than the left side as a vortex chamber differential pressure. Due to the pressure difference between the vortex chambers, the flow deflected to the left is deflected to the right. When the right-side deflection is completed, the same operation as described for the left-side deflection also occurs during the right-side deflection. Such deflection operation is repeated and self-oscillation occurs. On the other hand, when the pressure in the left side vortex chamber 8 is low and the pressure in the right side vortex chamber 9 is high due to leftward deflection, the displacement wall surface provided on the packing 4 moves the left side displacement wall to the position of dotted line 19 in FIG. The wall is at the position shown by the solid line 18 in FIG. As a result, the volumes of the vortex chambers 8 and 9 are changed, and the change time of the pressure in the vortex chamber becomes longer in accordance with this change, and the self-oscillation cycle becomes longer.

At the air communication ports 10 and 11, when the pressure in the vortex chamber is lower than atmospheric pressure, the air flows into the vortex chamber, and when the pressure in the vortex chamber becomes higher than atmospheric pressure, the gas-liquid mixed fluid in the vortex chamber becomes atmospheric. Drains into. Therefore, the pressure change speed of the vortex chamber is determined by the ratio of the flow rate of the liquid that is attracted and discharged by the main jet and the flow rate of the atmosphere that flows into the vortex chamber. The inflow of the atmosphere from the communication port due to the above phenomenon delays the decrease in the vortex chamber pressure due to the induced discharge action by the jet flow, and the oscillation cycle becomes longer.

The stability of self-oscillation is promoted by the synergistic effect of the action of this communication port and the displacement of the packing.

EFFECTS OF THE INVENTION 1. As described above, since the flow channel configuration does not have a signal path such as a feedback flow channel, the flow channel is simple. Therefore, there is no trouble due to the clogging of the signal path, the operation is stable, and the element is easily manufactured.

2. Low-frequency oscillation with a long jet oscillation cycle ensures that the jet adheres to the side wall, resulting in an oscillating jet with less jet diffusion. As a result, when used for cleaning or the like, the cleaning effect is enhanced.

3. Since a part of the packing is used as a displacement wall, parts can be shared, reliability is improved, and cost is reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view of a fluid oscillating device showing an embodiment of the present invention, FIG. 2 is a flow path pattern diagram of the same fluid oscillating device, and FIG.
FIG. 4 is a plan view of the upper plate of the fluid oscillating device, FIG. 4 is a plan view of the packing of the fluid oscillating device, FIG. 5 is a sectional view of the packing of the oscillating device, and FIG. 6 is a state showing the operation of the fluid oscillating device. Figure,
FIG. 7 is a sectional view of a packing showing an operating state of the fluid oscillating device, and FIG. 8 is a flow path pattern diagram of a conventional oscillating device. 4 ... packing, 6 ... supply channel, 7 ... supply nozzle,
8, 9 ... Vortex chamber, 10, 11 ... Atmosphere communication port, 13, 14 ... Side wall, 15 ... Jet port, 17, 18 ... Displacement wall surface.

Claims (2)

[Claims] 1. A supply flow path from upstream to downstream, a supply nozzle, left and right vortex chambers downstream of the supply nozzle, an atmosphere communication port communicating with the outside provided in the left and right vortex chambers, and a left and right vortex chambers located downstream of the vortex chambers. A fluid oscillating device comprising an output path formed of a side wall and a displacement wall surface that displaces a part of the vortex chamber according to pressure. 2. The fluid oscillating device according to claim 1, wherein a thin wall portion is provided on a part of the packing for the displacement wall surface.