JPH09192548A - Liquid ejection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a device compact and increase the momentum of a liquid ejection at a low cost by providing a device to inject and mix a microbubble uniformly into a liquid at a higher pressure than a liquid flowing through a liquid conduit, at the liquid conduit, and increasing the momentum of the liquid to be ejected. SOLUTION: In a liquid ejection device, a liquid 1 advances by passing through a liquid conduit 2, and a gas 4 is supplied through a gas conduit 5 at a high pressure. The gas 4 is ejected into the liquid 1 passing through an outer peripheral part of a sintered metal mesh 6 from the microhole of the mesh 6, and is mixed into the liquid 1 as a microbubble 7. Then the liquid 1 containing the microbubbles 7 is ejected to the outside as a jet current 8 from a nozzle 3. In this device, the density of the jet current is high as it is the density of liquid and the jet velocity is low, unless the gas 4 is supplied. On the contrary, the density of the jet current is low and the jet velocity is high, if the gas 4 is mixed into the liquid 1. Therefore, the jet velocity is expected to be high, while the flow rate is not so significantly varied, hence the momentum is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid ejection device. The method can be applied to nozzles of fire trucks, cleaning devices, machine tools using water streams, and the like.

[0002]

2. Description of the Related Art Conventionally, to increase the momentum of a liquid jet,
There was no other way than increasing the mass flow rate per unit time or increasing the capacity of the pump etc. to increase the ejection speed.

[0003]

In order to increase the mass flow rate per unit time, it is necessary to increase the capacity of the supply device and to increase the size of the entire device due to the increased flow rate, and to increase the tank or storage location that is the source of the flow rate. I needed to improve my ability. In addition, in order to increase the ejection speed, it was necessary to increase the capacity of the supply device as described above. All of these increase the product capacity, which leads to an increase in the size and cost of the product.

The present invention is intended to provide a liquid ejecting apparatus which is small in size and low in cost and which increases the momentum of a liquid jet.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is a liquid jet for jetting a liquid pressurized and supplied from one end of a liquid conduit through a nozzle provided at the other end of the liquid conduit. In the apparatus, a device for uniformly injecting fine bubbles into the liquid at a pressure higher than the pressure of the liquid flowing through the liquid conduit is provided in the liquid conduit to increase the momentum of the ejected liquid. The present invention relates to a liquid ejecting device.

[0006]

1 is a vertical sectional view of a liquid ejecting apparatus according to an embodiment of the present invention. In the figure, 1 is a liquid to be pressurized and supplied to this apparatus, 2 is a liquid conduit, 3
Is a nozzle connected to the same conduit, 4 is a gas which is pressurized to a pressure higher than that of the liquid and is supplied to the device, 5 is a gas conduit for guiding the gas into the device, and a portion in the liquid conduit is It is parallel to the axis of the liquid conduit. Reference numeral 6 denotes a sintered metal mesh provided on the cylindrical portion of the gas conduit, which is parallel to the liquid conduit. Reference numeral 7 is a fine bubble ejected from the same mesh into the liquid, and 8 is a jet flow including the same bubble and ejected from the nozzle 3. The above-mentioned sintered metal mesh has a large number of fine pores having a size of 10 and several microns. As a material for the sintered metal mesh, a stainless steel-based material is preferable.

In the device, the liquid 1 travels through a liquid conduit 2. The gas 4 is supplied at high pressure via the gas conduit 5. The gas 4 passes through the fine holes of the sintered metal mesh 6,
It spouts into the liquid passing through the outer peripheral portion of the mesh, and becomes fine bubbles that mix with the liquid. The liquid containing fine bubbles is ejected as a jet flow 8 to the outside through the nozzle 3.

In the above apparatus, assuming that the gas 4 is not supplied, the density of the jet flow is large because it is the liquid density, and the ejection speed is small. However, when the gas is mixed in the liquid, the density of the jet flow is low and the jet speed is high.
For this reason, the flow rate does not change so much and the ejection velocity increases, so that the momentum increases. The higher the pressure and the density of the gas to be mixed, the more the momentum increases.

This principle can be expressed by the following formula.

[0010]

[Equation 1]

From the above equation, the following equation can be obtained by calculating the momentum ratio when γ = 0 and when it is not.

[0012]

[Equation 2]

If, for example, water is selected as the liquid, air supplied at a pressure of 5 ata is selected as the gas, and 0.01 is selected as the mass ratio,

[0014]

(Equation 3)

## EQU1 ## Therefore, if gas is mixed at a mass ratio of 0.01, the momentum becomes 1.6 times at a pressure of 5ata.

In this embodiment (FIG. 1), the sintered metal mesh 6 is provided in the cylindrical portion of the gas conduit 5 inserted in the flow of liquid, but the sintered metal mesh 6 is shown. May be provided at the tip of the gas conduit. Further, a sintered metal mesh may be provided on the inner surface of the cylindrical portion of the liquid conduit to allow gas to be mixed in from around the liquid flow.
In that case it is not necessary to insert the gas conduit into the liquid conduit. Further, a large number of branch pipes may be provided in the portion of the gas conduit 5 inserted into the liquid flow, and a sintered metal mesh may be provided on the branch pipes to eject the gas to achieve more uniform mixing. . In short, any means can be used as long as it allows the fine bubbles to be uniformly mixed in the liquid flow.

FIG. 2 is a system diagram of an embodiment relating to the use of the liquid ejecting apparatus. In the figure, 9 is a fire engine for supplying water, 10 is a nitrogen gas supply source for supplying nitrogen gas at a pressure higher than the pressurized water supplied by the fire engine, and 11 is the liquid ejecting apparatus shown in FIG.

In this embodiment, the liquid jetting device shown in FIG. 1 is applied to the water discharge part of a fire engine, and nitrogen gas is depressurized from a high-pressure nitrogen gas supply source to a pressure of several ata and mixed into water. To do. As a result, the momentum of water discharge can be increased and the reach of the fire extinguishing water can be lengthened. The nitrogen gas supply source 10 may be permanently installed in the fire engine 9 or may be carried to the site when necessary.

FIG. 3 is a system diagram of another embodiment relating to the use of the liquid ejection device of the present invention. In the figure, 12 is a water pump for supplying water, 13 is an air compressor for supplying air at a pressure higher than the pressure of water supplied by the water pump, 14
Is a liquid ejecting apparatus shown in FIG. 1, and 15 is an object to be cleaned, and shows a dish as an example.

In this embodiment, the liquid ejecting apparatus shown in FIG. 1 is applied to a cleaning apparatus. As the gas, air which is pressurized to several ata using a compressor is used, and this is pressurized by a pump or the like. It is mixed with water to increase the jetting momentum of the washing water and improve the washing ability.

[0021]

As described above, when there is a nozzle that discharges 1 kg / s of water, for example, in order to multiply this momentum by 1.6, only 0.01 kg / s of air of 5ata is required. Just mix it in. Therefore, in the liquid ejecting apparatus of the present invention, the momentum of the liquid jet can be easily increased by mixing a slight amount of gas without increasing the liquid supply capacity, the storage capacity and the like. Further, by using this device, it is possible to effectively extinguish a fire or wash.

[Brief description of the drawings]

FIG. 1 is a liquid ejection device according to an embodiment of the present invention.

FIG. 2 is a system diagram of an embodiment relating to the use of the above device.

FIG. 3 is a system diagram of another embodiment related to the use of the above device.

[Explanation of symbols]

 1 Liquid 2 Liquid Conduit 3 Nozzle 4 Gas 5 Gas Conduit 6 Sintered Metal Mesh 7 Fine Bubbles 8 Jet 9 Fire Engine 10 Nitrogen Gas Supply Source 11 Liquid Jet 12 Pump 13 Air Compressor 14 Liquid Jet 15

Claims (1)

[Claims] 1. A liquid ejecting apparatus for ejecting a liquid pressurized and supplied from one end of a liquid conduit through a nozzle provided at the other end of the liquid conduit, at a pressure higher than the pressure of the liquid flowing through the liquid conduit. A liquid ejecting device, characterized in that a device for uniformly ejecting and mixing fine bubbles into a liquid is provided in the liquid conduit to increase the momentum of the ejected liquid.