JP2000300975A - Gas-liquid mixing nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a mixed water of high density by using a nozzle-type gas-liquid mixing means and mixing ultrafine particle-shaped foams of even particle diameter into a pressurized water. SOLUTION: The gas-liquid mixing nozzle is formed of an outer cylinder 2 and an inner cylinder 3 set on the inside of the outer cylinder, and a pressurized water is introduced from a small diameter section 2a on one end of the outer cylinder 2, while a gas is introduced from a connecting pipe 7a on one end of the inner cylinder 3. An introduction hole 5 for introducing the pressurized water is formed on the outer cylinder 3 in the tangential direction to the inner diameter of a mixing chamber 6, and the introduction hole 5 is formed into a slot shape. The gas is sucked by negative pressure from an opening 6a into the pressurized water flowed into the mixing chamber 6, mixed therein, jetted out of a jet opening 6b and an opening 9a to prepare a mixed water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid mixing nozzle for mixing and dissolving a gas such as air and ozone in water to generate high-concentration bubble-mixed water.

[0002]

2. Description of the Related Art Oxygen and ozone are mixed and dissolved in water, and the water in which oxygen is dissolved is useful for improving water quality by activating water, and the ozone water in which ozone is dissolved is used for sterilization and deodorization. Since there are advantages such as utilization, various attempts have been made to dissolve these gases at a high concentration, and one of them is a method of mixing a minute gas with water by an injection nozzle.

As means for dissolving oxygen in water by such a method, Japanese Patent Application Laid-Open No.
A publicly known bubble generator is known. This bubble generator is provided with an opening for introducing a liquid in a tangential direction of its inner circumference in a cylinder having one end closed and the other end open, and an opening for introducing gas at a center position of the cylinder at a closed end. It consists of. The liquid flows into the mixing chamber formed inside the cylinder in a swirling shape from the outer periphery, and when the liquid flow flows out from the other end, the suction force (negative pressure) generated near the center of the liquid flow is used for introducing outside air. A gas is sucked from the opening, and this gas violently collides with the liquid flow to become microbubbles and is mixed with the liquid flow.

As an example of a gas-liquid mixing device for generating ozone water, a gas contact device and an ozone water production device disclosed in Japanese Patent Application Laid-Open No. 5-123554 (hereinafter referred to as "second publication") are known. The ejector-type gas nozzle, which is the main member of this gas-liquid contact device, has a liquid nozzle at the center, sucks gas at a negative pressure due to the liquid jet through a suction gas chamber provided on the outer periphery, and ejects the gas together with the ejected fluid. The gas is blown out as gas bubbles from gas injection holes provided in a gas nozzle member (cap) at the nozzle tip.

[0005]

The bubble generator disclosed in the above-mentioned first publication is provided with a member which rotates with the liquid flowing straight in, which sucks gas from the outer periphery with the fluid energy of the liquid flowing in a swirling manner into the mixing chamber. There is also a swirling method in which a liquid is swirled to suck the outside air around the outer periphery, mix the gas, and eject it.

[0006] In any of the gas-liquid mixing devices of the nozzle type for mixing, injecting or jetting gas-liquid of the above-mentioned various types, the length of the gas to the outlet is too short with respect to the inner diameter of the mixing chamber, and the gas is not sufficiently mixed. Various attempts have been made to forcibly mix and suck a gas with a liquid having a relatively high pressure, but it has been difficult to uniformly and finely atomize the bubbles.

The present invention takes into account the problems of the gas-liquid mixing nozzle of the nozzle type as described above, and mixes ultrafine particles having a uniform particle size with pressurized water having a relatively low water pressure to form water. It is an object of the present invention to obtain a gas-liquid mixing nozzle that generates high-concentration mixed water with improved dissolution efficiency.

[0008]

According to the present invention, an outer cylinder for introducing pressurized water and an inner cylinder for introducing gas inside the outer cylinder are provided as means for solving the above-mentioned problems. The mixing chamber is provided with an introduction hole for introducing pressurized water in a tangential direction, the introduction hole is formed in a long hole shape along the longitudinal direction of the mixing chamber, and piping for introducing pressurized water and gas to one end of the outer cylinder and the inner cylinder, respectively. Gas-liquid mixing, wherein pressurized water is injected from an injection hole provided at the other end of the inner cylinder, gas is sucked by the negative pressure of the fluid energy, and mixed water in which bubbles are mixed is injected. It was a nozzle.

[0009] The gas-liquid mixing nozzle having such a configuration generates high-concentration mixed water by mixing bubbles into pressurized water. Pressurized water is fed into the outer cylinder, and gas is introduced into the inner cylinder. Pressurized water flows into the mixing chamber in the inner cylinder from the outer circumference in a tangential spiral through the introduction hole and moves to the injection hole at the other end, and sucks gas into the inner cylinder by the negative pressure of the fluid energy of the pressurized water. And mix with pressurized water.

When the gas is sucked into the mixing chamber, the spiral pressurized water and the gas collide violently and are mixed as ultrafine bubbles. In addition, since the introduction hole is provided in the shape of a long hole, the downstream pressurized water collides with the flow of the pressurized water moving in the longitudinal direction when flowing into the mixing chamber, and the water flow maintains a pressurized state. For this reason, the mixed air bubbles are further atomized, and are mixed in a state where the particle diameters are ultrafine and uniform. The degree of the ultra-fine atomization becomes smaller as the length of the slot of the introduction hole becomes longer to a certain limit, and becomes indistinguishable visually.

[0011]

Embodiments of the present invention will be described below. FIG. 1 is a main cross-sectional view of the gas-liquid mixing nozzle of the embodiment. The illustrated gas-liquid mixing nozzle 1 is provided with an outer cylinder 2 for introducing pressurized water and an inner cylinder 3 for introducing a gas inside thereof in a concentric manner. A small-diameter portion 2a at one end of the outer cylinder 2 is narrowed to a small diameter for connection to a pipe 11 for introducing pressurized water, and an inflow chamber 4 is provided between the small-diameter portion 2a at one end. Inner cylinder 3
Has a length substantially the same as the large diameter portion of the outer cylinder 2, and is used to guide pressurized water into the inner cylinder 3 via a space 4 a between the outer circumference of the inner cylinder 3 and the inner diameter of the outer cylinder 2. An introduction hole 5 is provided,
The flowing pressurized water is guided to the mixing chamber 6.

A plurality of inlet holes 5 are provided (two in the illustrated example) so as to flow in a tangential direction to the inner diameter of the mixing chamber 6 in the inner cylinder 3 as shown in FIG. 6 are formed in a long hole shape along the longitudinal direction. The pressurized water flowing into the mixing chamber 6 from the introduction hole 5 is supplied to the injection hole 6 b at the other end of the inner cylinder 3.
And the gas is sucked from the opening 6a provided at one end of the inner cylinder 3 by the negative pressure of the fluid energy. One end of the inner cylinder 3 is supported by a support ring 7, a short connection pipe 7 a is provided in the opening 6 a, protrudes outside from the small diameter portion 2 a at one end of the outer cylinder 2, and a gas pipe 13 is connected to this. You. A large number of insertion holes 7b for conducting pressurized water are provided on the outer periphery of the support ring 7.

The other end of the outer cylinder 2 is supported by a support ring 10, and a cap 9 is mounted on the outside of the outer ring 2 via a screw portion 9 b. A seal 8 is fitted in an inner peripheral groove of a support ring 10 provided on the outer periphery of the inner cylinder 3 to seal the space in a watertight manner. The cap 9 is provided with a small hole 9a at the center thereof, and has the same diameter as the injection hole 6a at the other end of the inner cylinder 3.

Pressurized water sent by a pump 12 is conducted through the pipe 11 and is sent from the small-diameter portion 2a of the outer cylinder 2. The pressurized water is such that tap water is directly sent instead of water pressurized by the pump 12. It may be. In this embodiment, the ozone generator 1 is used as an example of gas to the pipe 13.
The ozone gas generated in 4 is sent. If the conduit 7a is opened to the atmosphere and the air is sucked without connecting the ozone generator 14, it can be used as a gas-liquid mixing nozzle.

FIG. 3 shows an example in which the gas-liquid mixing nozzle 1 having the above configuration is used. As shown in the figure, the gas-liquid mixing nozzle 1 is installed in a tank Tk such as a pool, a bath, or a reservoir, and pressurized water and ozone gas are sent from an external pump 12 and an ozone generator 14, mixed by the nozzle, and mixed in the tank. Is stored in The stored water contains ozone at a high concentration and is used for sterilization and deodorization as ozone water.

In the gas-liquid mixing nozzle 1, the pressurized water flows into the mixing chamber 6 in the inner cylinder 3 from the tangential direction, so that the water is ejected from the injection hole 6b while spirally rotating in the mixing chamber 6. The ozone gas sucked from the opening 6a by the negative pressure of the energy is mixed in the pressurized spiral water flow. Therefore, when the ozone gas is sucked into the pressurized water stream, it collides violently with the pressurized water and is mixed in as extremely fine bubbles. Mixed.

In the gas-liquid mixing nozzle 1, as described above, the introduction hole 5 for introducing pressurized water into the mixing chamber 6 of the inner cylinder 3 has an elongated shape along the longitudinal direction of the mixing chamber 6. For,
The bubbles to be mixed become ultrafine particles. If the introduction hole 5 is not a long hole but a single circular small hole, the degree of atomization of the bubbles increases, and the particle diameters of the fine bubbles are not uniform. However, when the length of the introduction hole 5 is elongated, the particle size of the fine particles becomes uniform and the particles are ultrafine as the length becomes longer. However, there is a certain limit due to the balance between the amount of water and the amount of air above a certain length in relation to the inner diameter of the mixing chamber 6.

As described above, when the introduction hole 5 is elongated, ozone gas bubbles sucked by the negative pressure generated by the fluid energy of the pressurized water flowing from the upstream end of the introduction hole 5 have a particle diameter at the upstream end. Even if the size is not uniform, the pressurized water of the same pressure flows in the mixing chamber 6 from the introduction hole 5 at each position along the length direction to the downstream end of the introduction hole 5 at the downstream position. As the bubbles move toward the downstream end while the bubbles continue to be compressed by the pressurizing action of the pressurized water, the particle size of the bubbles is reduced and becomes an ultra-fine particle,
The particle size will be uniform.

The illustrated gas-liquid mixing nozzle 1 has an outer diameter of the inner cylinder 3 of 20 mm, an inner diameter of the mixing chamber 6 of 10 mm, a length of the mixing chamber 6 of 55 mm, a length of the introduction hole 5 of 30 mm, and a width outer end of 2 mm. 0.5 kg / cm ² of pressurized water and 20 l / min of water discharged from a pump were added thereto, and ozone gas was sucked and mixed. Ozone water in which ozone was dissolved was stored in a 60-liter water tank, and a test was conducted. It was 0.5 ppm. Then, the ozone-mixed fine particles at this time were dissolved in the form of ultrafine particles to the extent that bubble particles could not be visually observed. As described above, when the efficiency of dissolving ozone in water is improved, waste ozone can be reduced.

In the above embodiment, an example in which air bubbles of ozone gas are mixed into pressurized water has been described. However, air in the atmosphere is mixed instead of ozone gas to dissolve ultrafine oxygen and produce activated water. It can also be used to do so.

[0021]

As described in detail above, the gas-liquid mixing nozzle of the present invention is provided with an introduction hole in the inner cylinder provided in the outer cylinder so that the pressurized water flows into the mixing chamber inside the inner cylinder in the connection direction. The inlet hole is elongated, and the gas is sucked into the inner cylinder at a negative pressure generated by the fluid energy of the pressurized water sent to the outer cylinder and mixed to generate mixed water in which ultrafine bubbles are dissolved. With this configuration, the gas-liquid mixing nozzle has an advantage that it is possible to obtain high-concentration mixed water obtained by dissolving ultrafine bubbles in pressurized water so as to be invisible to the naked eye.

[Brief description of the drawings]

FIG. 1 is a main longitudinal sectional view of a gas-liquid mixing nozzle according to an embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an explanatory diagram of a method of using a gas-liquid mixing nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas-liquid mixing nozzle 2 Outer cylinder 3 Inner cylinder 5 Inlet hole 6 Mixing chamber 6a Opening 6b Injection hole 7 Support ring 8 Seal 9 Cap

Claims (2)

[Claims] 1. An outer cylinder for introducing pressurized water and an inner cylinder for introducing gas inside the outer cylinder, and an introduction hole for introducing pressurized water tangentially into a mixing chamber in the inner cylinder are provided in the inner cylinder. A hole is formed in a long hole shape along the longitudinal direction of the mixing chamber, a pipe for introducing pressurized water and gas is connected to one end of the outer cylinder and the inner cylinder, and pressurized water is supplied from an injection hole provided at the other end of the inner cylinder. Gas is sucked out by the negative pressure generated from the fluid energy
A bubble mixing nozzle configured to inject mixed water in which bubbles are mixed. 2. The pressurized water according to claim 1, wherein the pressurized water is introduced into a space between the outer periphery of the inner cylinder and the inner diameter of the outer cylinder, and the pressurized water is introduced into the mixing chamber through the introduction hole. Gas-liquid mixing nozzle.