JPH0641766B2 - Two-phase fluid oscillator - Google Patents

Description

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

Configuration of Conventional Example and Problems Thereof A conventional oscillator is shown in FIG. This element has an inlet 1, a feed nozzle 2, jet adhering walls 3 and 4 on both sides downstream of the feed nozzle, and control ports 5 and 6 between the feed nozzle 2 and the jet adhering walls 3 and 4, respectively. The control ports 5 and 6 are configured to communicate with feedback ports 7 and 8 provided in the jet flow adhering walls 3 and 4 via feedback flow paths 9 and 10.

In the above configuration, the liquid flowing in from the inflow port 1 is ejected from the supply nozzle 2. This jet adheres to one of the adhering walls due to the Coanda effect. First, it is assumed that the jet flow adhering wall 3 is attached. The attached jet is ejected along the attachment wall 3 from the outlet 11 into the atmosphere. A part of the jet flows into the feedback port 7, passes through the feedback channel 9 and returns to the control port 5. The flow entering the control port 5 switches the jet flow from the attachment wall 3 to the attachment wall 4 side. Thereafter, the jet stream repeats the above operation.
As a result, the jet flow from the supply nozzle 2 is ejected by alternately attaching the adhering walls 3 and 4, and the jet flow oscillates.

Since the above-mentioned conventional oscillating element is provided with a signal transmission flow path such as a feedback flow path, the flow path is blocked to cause a malfunction, and in order to control oscillation and stop, a signal flow to the outside is separately provided. It had the drawback of having to provide a road.

It is an object of the present invention to provide a two-phase fluid oscillating device capable of easily selecting an oscillating jet flow and a non-oscillating jet flow as a jet flow pattern of a cleaning device, a sprinkler, or the like.

To achieve the above object, the present invention provides a narrowed portion at the outlet of a pure fluid element consisting of a supply nozzle, an adhering wall, and an outlet, and a throat portion or a nozzle upstream of the supply nozzle. The gas introducing means is provided on the side. With this configuration, it is possible to switch the oscillation and non-oscillation of the pure fluid element by controlling the gas inflow from the gas introduction means.

Description of Embodiments One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 2, the two-phase fluid oscillation element 12 is an element substrate 1
3, the upper plate 14 and the packing 15 have a laminated structure, and the device substrate 1
3, a main flow pipe 16 and a gas introduction pipe 17 are attached.

FIG. 3 shows a flow path pattern formed on the element substrate 13. Reference numeral 18 is a supply path, 19 is a supply nozzle, 20 and 21 are adhesion walls provided on both sides of the supply nozzle 19, and 22 is a jet outlet. A narrowed portion 23 is provided at the open ends of the walls 20 and 21. The supply path 18 is provided with a gas introduction port 24, and the gas introduction port 24 is a gas introduction pipe 17 showing a gas introduction means.
Through the atmosphere.

4, 5 and 6 show the operating state of the element, F ₁ ,
F ₂ , F ₃ are jet flows, V ₁ , V ₂ , V ₃ are low-pressure vortices generated between the jet and the adhering wall due to the fluid entrainment action of the jet, B ₁ , B ₂ , B ₃ are air pressurizing devices, etc. The air bubbles sent from the air to the air introduction means and mixed in the liquid are shown. Further, W ₁ and W ₂ represent the gap between the jet flow in the throttle portion 23 and the tip of the throttle portion.

The operation based on the above configuration will be described.

First, when there is no bubble introduction from the gas introduction pipe 17 showing the gas introduction means, the liquid flowing into the supply passage 18 from the main passage 16 is ejected from the supply nozzle 19 (F _{1 in} FIG. 4). The jet F ₁ adheres to either one of the adhering walls 20 and 21 due to the Coanda effect. In this embodiment, a low pressure vortex V ₁ is formed as shown in FIG. The direction of jet attachment can be set in one direction by intentionally making the element shape asymmetric. The adhering jet F ₁ flows out into the atmosphere from the outlet 22. Atmosphere flows in between the adhering jet flow F ₁ and the non-adhering wall 21 through the gap W ₁ between the tip of the throttle portion 23 and the jet F _1, and low pressure vortices due to the Coanda effect do not occur. Therefore, the attached jet
Unless F ₁ gives a signal from the outside, F ₁ is kept attached and continues to be ejected from the outflow port 22.

Next, a gas is introduced into the supply path 18 from the gas introduction pipe 17 which shows a gas introduction means using an air pressurizing device or the like. The introduced gas mixes in the liquid flow to form bubbles B ₁ . Bubble B ₁ of 1
Part flows into the low-pressure vortex V ₂ part (B _{2 in} FIG. 5), and raises the pressure of the low-pressure vortex V ₂ . The pressure rise of this low-pressure vortex is further promoted by the continuously flowing bubbles B ₁ . The jet flow separates due to the pressure rise of the low-pressure vortex V ₂ (Fig. 5, F ₂ ). Therefore, the gap W ₂ between the jet F ₂ and the throttle portion 23 becomes narrower, and the jet F ₂ and the non-attached side wall 21
The air inflow into the space decreases, and the pressure between the jet F ₂ and the adhering wall 21 decreases. As a result, the Coanda effect occurs between the jet flow and the adhesion wall 21, and the jet flow adheres to the adhesion wall 21 (F _{3 in} FIG. 6). After that, the above operation occurs on the side of the adhering wall 21, and the jet flow becomes an oscillating flow that alternately adheres between the adhering walls 20 and 21.

In this embodiment, since the outlet portion 22 is provided with the throttle portion 23,
In addition to the jet adhering delamination caused by the pressure rise of the low-pressure vortex due to the gas inflow, the Coanda effect on the non-adhesive wall side is promoted, and the adhering jet flow is switched, that is, the self-oscillation of the jet flow is stabilized.

Another embodiment of the present invention will be described with reference to FIGS. 7 and 8.

In FIG. 7, the two-phase fluid oscillation element 25 is an element substrate 2
6, the upper plate 27, the packing 28 laminated structure, the element substrate 2
6 is a main flow path pipe 29, and a gas introduction pipe 3 showing a gas introduction means.
0 is attached.

FIG. 8 shows a flow path pattern formed on the element substrate 26. Reference numeral 31 is a supply path, 32 is a supply nozzle, 33 and 34 are attachment walls provided downstream of the supply nozzle, and 35 is a jet flow outlet, which is a throttle portion 36. Have Throat portion 37 of the supply nozzle 32
A gas introducing port 38 is provided in the gas introducing port 38, and the introducing port 38 communicates with the atmosphere via a gas introducing pipe 30. Reference numeral 39 is a signal plate that opens and closes the opening of the gas introduction pipe 30.

The operation based on the above configuration will be described.

Air is introduced from a gas introduction pipe 30 showing a gas introduction means,
When the jet flow is caused to self-oscillate, the signal plate 39 is separated from the gas introduction pipe 30 and the opening of the gas introduction pipe 30 is opened. The liquid that has flowed into the supply passage 31 is ejected from the supply nozzle 32.
At this time, since the nozzle throat 37 has a high-speed flow, the static pressure decreases, and the pressure of the gas introduction port 38 becomes equal to or lower than the atmospheric pressure.
As a result, air flows into the jet flow, bubbles are formed in the liquid, and the jet self-oscillation is performed based on the low-pressure vortex breakdown phenomenon of the bubbles described in the above embodiment.

As described above, the present embodiment does not require an external air source because the air flow for the jet self-oscillation signal is induced by the negative pressure generated by the jet flow of the element. Therefore, the jet flow can be easily controlled to oscillate and stop, and the stability of the operation can be improved.

EFFECTS OF THE INVENTION According to the present invention, (1) the flow path pattern of the fluid element has no control flow path, which makes it very simple. Therefore, the attachment of the jet flow is reliable, the operation is stable, and the element design is easy.

(2) Since the throttle part at the outlet is provided, the timing of the breakdown of the low pressure vortex and the generation of the low pressure vortex on the non-adhesive side wall, and the balance of the low pressure are optimized, and the self-oscillation operation of the jet flow is stabilized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional oscillator, FIG. 2 is a perspective view of a two-phase fluid oscillator showing an embodiment of the present invention, and FIG. 3 is a sectional view of the same. FIG. 4 is a sectional view showing a jet flow adhering state of the same element, FIG. 5 is a sectional view showing a jet flow adhering state of the same element when bubbles enter, and FIG. 6 shows a jet flow adhering state of the same element when bubbles enter. A sectional view, FIG. 7 is a perspective view of a two-phase fluid oscillation device showing another embodiment of the present invention, and FIG. 8 is a sectional view of the same device. 19 ... Supply nozzle, 20, 21 ... Adhesive wall, 22 ...
Jet outlet, 23 ... throttle part, 24 ... gas inlet, 3
7 ... Throat.

Claims (2)

[Claims] 1. A supply path upstream of the supply nozzle, wherein a narrowed portion is provided at the jet flow outlet of a liquid element including a supply nozzle, an attachment wall provided on both sides of the supply nozzle downstream, and a jet flow outlet provided downstream of the attachment wall. Alternatively, a two-phase fluid oscillating device in which gas supply means is provided in the supply nozzle portion. 2. The supply nozzle has a throat portion parallel to the flow, and the gas introduction means is provided with a gas introduction port in the supply nozzle throat portion, and gas is introduced by the static pressure reduction of the liquid flow of the supply nozzle throat. Claim 1 with the structure
A two-phase fluid oscillating device according to the item.