JPH1182398A - Ejector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high sucking capability, and to improve mixing property of fluid by connecting a discharge tube to an injection tube, connecting a suction tube to the injection tube and the discharge tube at a right angle, and providing the injection tube with a tapered conical nose part and a nozzle opened at the tip of the nose part. SOLUTION: In the case of using an ejector, a first fluid F1 supply source is connected to an injection tube 3 through a power source such as a compressor, and a second fluid F2 supply source is connected to a suction tube 5. The first fluid F1 is fed with pressure from the supply source to the injection tube 3 by driving the power source, and injected from the nozzle 10. At this stage, a negative pressure is generated in a peripheral space of a nose part 8 and a flow straightening part 9 of the injection tube 3, and the second fluid F2 is sucked from the suction tube 5 into the peripheral space of the nose part 8 by this negative pressure. Thereafter, the second fluid F2 is flowed to the flow straightening part 9 side along the nose part 8, and mixed with the first fluid F1 near the nozzle 10, and discharged from a discharge port 13 of a discharge tube 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector used for sucking and discharging other fluids by converting velocity energy of a fluid ejected from a nozzle into pressure energy.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional ejector. The ejector 51 includes an injection pipe 52 and an injection pipe 52.
Is formed in a T-shape from a discharge pipe 53 straightly connected to the front of the pipe and a suction pipe 54 connected between the two pipes 52 and 53. A nozzle 55 having a narrowed cross section is provided at the tip of the injection pipe 52.
It is arranged to face. A diffuser 56 is provided at the rear end of the discharge pipe 53 so as to face the nozzle 55.
Is provided.

When the fluid (first fluid) F1 is ejected from the nozzle 55 of the ejection pipe 52, a negative pressure is generated near the nozzle 55, and the negative pressure causes another fluid (second fluid) to pass through the suction pipe 54.
Fluid) F2 is sucked. Then, the first and second fluids F1 and F2 are mixed with each other near the nozzle 55 and then decelerated and rectified by the diffuser 56,
It is discharged from the discharge pipe 53.

[0004]

However, in the above-described conventional ejector 51, the suction pipe 54 is opened near the nozzle 55 of the injection pipe 52, and the second fluid F2 is sucked at this position and the second fluid F2 is sucked. It is mixed with one fluid F1. For this reason,
The space for generating the negative pressure is small, and the second fluid F2 is
The turbulent fluid is mixed with the first fluid F1 in a large pressure loss state. As a result, there is a drawback that the second fluid F2 cannot be sufficiently sucked, the suction capacity of the ejector 51 is limited, and the mixing properties of the two fluids F1 and F2 are not good.

Further, the ejector 51 shown in the drawing has a drawback that each component is specially designed exclusively for the ejector and the number of parts is very large, so that the manufacturing cost is high.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides an ejector which can obtain a high suction capacity, is excellent in fluid mixing properties, and can reduce the manufacturing cost. With the goal.

[0007]

In order to achieve this object, an ejector according to the present invention comprises an injection pipe, a discharge pipe which is straightly connected to the injection pipe, and has a discharge port at a tip thereof, and the injection pipe and the discharge pipe. A suction pipe provided at a right angle so as to communicate with them, the injection pipe has a tapered conical nose portion extending to the discharge pipe side beyond the suction pipe, and a nozzle opening at the tip thereof, It is characterized by having.

According to this ejector, when the first fluid is jetted from the nozzle at the tip of the jet pipe, a negative pressure is generated in the space around the tapered nose. Due to the generation of the negative pressure, the second fluid is sucked from the suction pipe into the negative pressure space. afterwards,
The second fluid flows toward the nozzle while increasing the flow velocity along the tapered nose portion, is mixed with the first fluid near the nozzle, and is discharged from the discharge port of the discharge pipe. As described above, in the ejector of the present invention, a larger negative pressure space is secured around the nose portion than in the related art, and the second fluid is supplied along the tapered nose portion with a small pressure loss to the nozzle side. Flows to Therefore, the suction amount of the second fluid can be increased,
The suction capability of the ejector can be increased, and the mixing property of both fluids can be improved.

In this case, it is preferable that the injection pipe further includes a rectifying section having a constant diameter extending from the tip of the nose section to the inside of the discharge pipe, and a nozzle is preferably opened at the tip of the rectifying section.

According to this structure, the second fluid sucked into the negative pressure space around the nose from the suction pipe flows through the space between the rectifying section having a constant diameter and the discharge pipe when heading toward the nozzle. And then mixed with the first fluid near the nozzle. As described above, the second fluid is mixed with the first fluid in a state of being rectified by the rectification unit, so that the mixing properties of the two fluids can be further improved.

In this case, it is preferable that the nozzle is arranged concentrically close to the discharge port of the discharge pipe, and the inner diameter of the nozzle is smaller than the internal diameter of the discharge port of the discharge pipe.

With this configuration, even if the first fluid ejected from the nozzle is slightly diffused after the ejection, it hardly hits the wall around the outlet of the outlet pipe and goes straight to the outlet. Due to the draw-in force of the first fluid that proceeds straight, the entrainment and outflow phenomenon of the second fluid and the pressure drop in the discharge pipe occur, so that the two fluids can be mixed smoothly and at a high speed. As a result, the mixing properties are further improved.
For example, the mixed fluid can be atomized or foamed.

In these cases, it is preferable that the injection pipe, the discharge pipe, and the suction pipe are respectively screwed to the T-shaped pipe cheese.

According to this configuration, the ejector according to any one of claims 1 to 3 can be manufactured only by screwing the injection pipe, the discharge pipe, and the suction pipe having predetermined dimensions and shapes to the commercially available T-shaped cheese. Therefore, the manufacturing cost of the ejector can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an ejector to which the present invention is applied. This ejector 1
Is composed of a T-tube cheese 2, an injection tube 3, a discharge tube 4, and a suction tube 5 screwed to the T-tube cheese 2. The T-tube cheese 2 is commercially available, for example, stainless steel having a diameter of 20 mm.

The injection pipe 3 is made of, for example, brass, and has a mounting portion 7 having a male thread 6 cut off, a tapered conical nose portion 8 extending from one end of the mounting portion 7, and a constant diameter extending from the tip of the nose portion 8. The rectifying portion 9 is formed integrally with the rectifying portion 9. For example, the outer diameter DE of the rectifying unit 9 is set to 7 mm, and the inner diameter DI of the nozzle 10 is set to 5 mm.

The injection pipe 3 having the above-described structure is attached to the T-tube cheese 2 by screwing the male screw 6 into the female screw 2a on one side of the T-tube cheese 2. In this state, the nose portion 8 of the injection pipe 3 extends into the T-tube cheese 2 beyond the position where the suction pipe 5 is attached, the rectifying section 9 extends inside the discharge pipe 4, and the nozzle 10 It is designed to be located near the tip. At the center of the rectifying section 9, six spacer plates 11 for positioning the rectifying section 9 at the center of the discharge pipe 4 are fixed at equal intervals in the circumferential direction.

The discharge pipe 4 has a constant diameter formed of, for example, brass, has a male screw 12 formed at one end, and is narrowed at the other end at an angle of 45 degrees. An outlet 13 is formed. This outlet 13
Is set to a value larger than the inner diameter DI of the nozzle 10 of the injection pipe 3, for example, 8 mm. The discharge pipe 4
The T-tube cheese 2 is attached to the T-tube cheese 2 by screwing the male screw 12 into the female screw 2 a of the T-tube cheese 2 on the opposite side of the injection tube 3. In this state, the nozzle 10 of the injection pipe 3
However, it faces concentrically close to the discharge port 13 of the discharge pipe 4.

Further, between the nozzle 10 and the discharge port 13,
A minute predetermined interval C is formed. This interval C is
It can be adjusted by tightening a lock nut 14 attached to the male screw 6 of the injection pipe 3, and is adjusted to 1.5 mm in the present embodiment, for example.

The suction pipe 5 is made of brass, similarly to the injection pipe 3 and the discharge pipe 4, and its male screw 15 is screwed into the remaining female screw 2 a of the T-tube cheese 2.
It is attached to the T-tube cheese 2.

Next, the operation of the ejector 1 having the above configuration will be described. As shown in FIG. 1, when the ejector 1 is used, the injection pipe 3 is connected to a supply source of the first fluid F1 via a power source such as a compressor (both not shown), and the suction pipe 5 is , A second fluid F2 (not shown). When the power source operates, the first fluid F
1 is pressure-fed from the supply source to the injection pipe 3 and is injected from the nozzle 10.

When the first fluid F1 is injected, a negative pressure is generated in the space around the nose portion 8 and the rectification portion 9 of the injection pipe 3. Due to the generation of the negative pressure, the second fluid F2 is sucked from the supply source into the space around the nose portion 8 via the suction pipe 5. After that, the second fluid F2 flows along the tapered nose portion 8 to the rectifying portion 9 with a small pressure loss, is rectified here, is mixed with the first fluid F1 near the nozzle 10, and is discharged. It is discharged from the outlet 13 of the tube 4.

As described above, according to the ejector 1 of the present embodiment, a wider negative pressure space is secured around the nose portion 8 than in the related art, and the second fluid F2 flows along the tapered nose portion 8. Thus, the gas flows toward the nozzle 10 with a small pressure loss. Therefore, the suction amount of the second fluid F2 can be increased, a high suction capability can be obtained, and the mixing property of the two fluids F1 and F2 can be improved. Also,
Since the second fluid F2 is rectified by the rectification unit 9 having a constant diameter on the way to the nozzle 10 side, the second fluid F2 is mixed with the first fluid F1 with a small pressure loss.
1, the mixing property of F2 can be further enhanced.

Further, the nozzle 10 is connected to the discharge port 1 of the discharge pipe 4.
3 and concentrically, and the nozzle 10
Of the nozzle 1 from the relationship of the inner diameter DI
Even if the first fluid F1 ejected from 0 is slightly diffused after the ejection, it hardly hits the wall around the outlet 13 and
Head straight to outlet 13. With this, the first fluid F1 that travels straight and the entrainment force of the first fluid F1 causes the entrained outflow phenomenon of the second fluid F2 and the discharge pipe 4 with little pressure loss due to the first fluid F1 hitting the wall of the discharge port 13.
Due to the pressure drop inside, both fluids F1, F2
Can be mixed smoothly and at a high speed. As a result, the mixing property can be further enhanced, and, for example, the mixed fluid can be atomized or foamed.

Further, the ejector 1 of this embodiment can be assembled simply by screwing the ejection tube 3, the discharge tube 4 and the suction tube 5 of the above-mentioned dimensions and shape to the commercially available T-tube cheese 2. , The manufacturing cost can be reduced.

FIG. 2 shows the ejector 1 of the above-described embodiment.
1 shows a CFC decomposition apparatus using the above method. The chlorofluorocarbon decomposer 21 combusts and decomposes chlorofluorocarbons by burning a premixed gas of propane and air, and treats exhaust gas containing decomposed components of fluorocarbons.
Is used for the premixing of propane and air. Specifically, in this CFC decomposition device 21, the air supply source 22
Power source (not shown) such as piping 23 and compressor
To the injection pipe 3 of the ejector 1 via the propane supply source 2
4 and a CFC supply source 25 are connected to the suction pipe 5 of the ejector 1 via a pipe 26, respectively. Also,
The discharge pipe 4 of the ejector 1 is connected to a closed combustion chamber 28 via a pipe 27.

According to this configuration, by operating the power source, air is sent from the air supply source 22 to the injection pipe 3 of the ejector 1 as the first fluid F1. Accordingly, propane and chlorofluorocarbon are ejected from the ejector 1 as the second fluid F2.
After being suctioned by the suction pipe 5 and premixed with air, it is sent to the combustion chamber 28 via the discharge pipe 4. In this case, as described above, since the ejector 1 of the present embodiment has high mixing performance, for example, even when the mixing ratio is propane: air = 1: 1, propane and air are premixed well and combustion is performed. Complete combustion can be performed at a high temperature in the chamber 28. As a result, the degree of combustion decomposition of CFCs is increased,
The generation of extra harmful gases other than Freon such as dioxin and NOx can be suppressed, and the total amount of exhaust gas can be reduced. Conventionally, there has been no means for premixing propane and air well, so that propane: air = 1: 1.2 to 1.3.
If the mixing ratio is not the same, combustion cannot be performed, and the above-described effects cannot be obtained.

The exhaust gas generated in the combustion chamber 28 is supplied to a pipe 29
Is sent to the dry exhaust gas treatment device 30 via the. The dry exhaust gas treatment device 30 includes, for example, a detachable oyster shell filter. HF (hydrogen fluoride) contained in the exhaust gas by passing the exhaust gas through the oyster shell filter
Most of the harmful decomposition components of chlorofluorocarbon such as HCl and HCl (hydrogen chloride) are neutralized and removed by the reaction with moisture in the air.

Thereafter, the exhaust gas is sent to a wet exhaust gas treatment device 32 via a pipe 31. The wet exhaust gas treatment device 32 is filled with an alkaline aqueous solution, for example, an NaOH (sodium hydroxide) aqueous solution, and the remaining components such as HF and HCl that have not been neutralized by the dry exhaust gas treatment device 30 are mixed with the alkaline aqueous solution. Summed and completely removed.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, the shape and dimensions of the ejector shown in the embodiment are merely examples, and it is needless to say that the ejector can be appropriately changed within the scope of the present invention. Also, as an application example of the ejector of the present invention, a CFC decomposition device has been described.
The ejector of the present invention is widely used not only for other mixing devices that mix two kinds of fluids, but also for devices that need to suck a fluid with a larger suction amount, and for fluid atomizers and microfoamers. be able to. In addition, the configuration of the details and the like can be appropriately changed without departing from the spirit of the present invention.

[0031]

As described in detail above, the ejector of the present invention has effects such as obtaining a high suction capacity, excellent mixing of fluids, and reducing the production cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of an ejector according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a CFC decomposition apparatus using the ejector of FIG.

FIG. 3 is a sectional view of a conventional ejector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ejector 2 T-tube cheese 3 Injection pipe 4 Discharge pipe 5 Suction pipe 8 Nose part 9 Straightening part 10 Nozzle 13 Discharge port DI Nozzle internal diameter D Nominal diameter of discharge port

Claims (4)

[Claims] 1. An injection pipe, a discharge pipe which is straightly connected to the injection pipe and has a discharge port at a tip thereof, and a suction pipe provided at a right angle between the injection pipe and the discharge pipe so as to communicate with them. An ejector comprising: a nozzle having a tapered conical nose portion extending toward the discharge tube beyond the suction tube; and a nozzle opening at a tip of the nose portion. 2. The discharge pipe according to claim 1, further comprising a rectifying section having a constant diameter extending from the tip of the nose section into the discharge pipe, wherein the nozzle is opened at the tip of the rectifying section. Item 2. An ejector according to Item 1. 3. The nozzle according to claim 2, wherein the nozzle is disposed concentrically near the discharge port of the discharge pipe, and an inner diameter of the nozzle is smaller than an inner diameter of the discharge port of the discharge pipe. The ejector according to claim 2, wherein 4. The ejector according to claim 1, wherein the injection pipe, the discharge pipe, and the suction pipe are each screwed to a T-shaped cheese.