JP2000334333A - Flow-straightening mechanism for fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize a flow velocity of a jet fluid and its temperature distribution by providing a dispersion flow-straightening plate for dispersing a fluid in four corner part and four side part directions in an area between an introduction part and a flow-straightening part in a mechanism wherein the fluid from an induction part is straightened in flow by the flow-straightening part and jetted from a jet nozzle. SOLUTION: A flow-straightening mechanism used on the spot for drying, heat treatment or baking or the like of a product is equipped with an introduction part 3 of a fluid at an upper center of a cylinder 2, and equipped with flow-straightening plates 15, 16 in order to jet the fluid at a uniform flow rate or flow velocity from jet nozzles 4. In this case, an introduction part 3 for the fluid is provided to an upper stream side central part of the cylinder 2, and a dispersion flow-straightening plate 1 is installed in an area 17 between the introduction part 3 and a flow-straightening part comprising the flow-straightening plates 15, 16 or the like. The fluid entered from the introduction part 3 of the cylinder 2 is dispersed in four corner part 10-13 and four side part 5-8 directions of the cylinder 2 by action of the dispersion flow- straightening plate 1. By installing the dispersion flow-straightening plate thus, a flow velocity regulation of the fluid and its temperature distribution adjustment can be more uniformized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid flow regulating mechanism, and more particularly to drying, heat treating or baking products.
The present invention relates to a fluid rectification mechanism that can make the flow velocity and temperature distribution of a fluid uniform when ejecting the fluid from an ejection nozzle at a site such as a drainer, an air curtain, a fluid shower, and dust removal. Here, the fluid may be any of a gas and a liquid, and may be any of a hot fluid, a normal temperature fluid, and a low temperature fluid.

[0002]

2. Description of the Related Art In general, an injection nozzle is attached to a flow path provided with a fluid rectifying section, and the product is dried, heat-treated or baked on a production line, drained, a space is separated by an air curtain, and the like. Further, it is used for forming a fluid shower or for dust removal.

The flow path provided with the rectifying section is provided with fluid supply equipment such as a blower, a compressor, a high-pressure cylinder, a pump, and the like. When a heating fluid is used, a fluid heating heater is provided in the flow path. Can be

As shown in FIG. 8, such a fluid rectification mechanism includes a fluid introduction portion 3 at the center of the upper portion of a rectangular cylindrical body 2 and a uniform flow rate or flow rate from ejection nozzles 4 of the outlet portion. For the purpose of injecting fluid, for example, the conventional current plate 15, 1
6 is provided.

[0005] When the fluid introduction part 3 is located at one place,
Conventional rectifying plates 15, 16, etc. are provided at the upper center of the rectangular cylindrical body 2, and when there are a plurality of introduction portions 3, the conventional rectifying plates 15, 16 are located symmetrically about the upper center of the cylindrical body 2. It is common to provide such as.

[0006] As described above, the conventional current plate 15, 1
6, the fluid flows in the direction shown by the arrow, and the ejection nozzles 4 provided in the fluid outlet section are provided.
The fluid can be ejected at a uniform flow rate or flow rate from the fluid. The injection nozzle 4 is appropriately formed in a single row or a plurality of rows of round holes, long holes, or slits arranged at equal intervals.

[0007] Generally, a conventional rectifying section is composed of a fluid introducing section 3.
The configuration is such that the cross-sectional area of the fluid flow path from the nozzle to the injection nozzle 4 is gradually narrowed, and the fluid flow path in the nozzle is tapered, or one or more conventional rectifying plates are arranged in the middle of the flow path, As the nozzle approaches the injection nozzle, the cross-sectional area of the fluid passage hole of the rectifying portion is gradually reduced to give resistance to the fluid, thereby uniformly flowing the fluid in the longitudinal direction or the surface direction (two-dimensional direction) of the nozzle. In any case, the conventional rectification unit has no structure for the purpose of dispersing the fluid at the four corners and four sides of the rectangular cylinder.

[0008]

In a conventional fluid rectifying mechanism, a fluid entering from an introduction portion is first gathered in a central portion having a small frictional resistance, and then the cross-sectional area of a flow passage is gradually reduced so that a conventional rectifying plate or the like is formed. Thus, a fluid is diffused in the longitudinal direction or the planar direction in a stepwise manner to achieve a uniform flow velocity.

For this reason, when the cross-sectional area of the introduction portion must be reduced due to the piping, or when it is desired to use a low-flow-rate fluid by increasing the cross-sectional area of the opening of the injection nozzle, There is a problem that it is difficult to make the flow velocity of the fluid uniform.

Further, when the conventional rectifying mechanism is used for a hot fluid such as hot air or hot water, there has been a great problem that the temperature distribution of the fluid near the position of the injection nozzle becomes non-uniform. This is because when the thermal fluid entering from the introduction portion 3 hits the current straightening plates 15 and 16 vertically and diffuses in a planar manner, the temperature is particularly high in the four corners 10 to 13 and the four sides 5 to 8 of the cylindrical body 2. This is because the temperature tends to decrease (see the table shown in FIG. 9).
Furthermore, fluid flow is difficult to flow around the four corners 10 to 13 of the rectangular cylindrical body 2 due to an increase in flow path resistance, and furthermore, it is located far from the introduction part 3 and heat transfer is slow. The decline tended to be significantly greater than in other parts.

Accordingly, as shown in FIG. 9, the temperature distribution of the jet fluid jetted from the jet nozzles 4 becomes high at T1 at the center of the rectangular cylindrical body 2 and is observed in the vicinity of the four sides 5-8. At points H1 and H2, the temperature decreases to T2, and the temperature T
The temperature difference of 1-T2 was relatively large.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems by providing a fluid rectifying mechanism which can reduce the installation space and has a simple structure and which can make the flow velocity and the temperature distribution of the jet fluid substantially uniform. .

[0013]

According to the first aspect of the present invention, there is provided a rectifier for rectifying the fluid flowing from the introduction portion near the center of the rectangular cylinder on the upstream side. In the fluid rectifying mechanism for ejecting the fluid rectified by the rectifying portion from the ejection nozzle provided at the outlet portion position of the rectangular cylinder, the portion is disposed in the cylinder, in the region between the introduction portion and the rectifying portion of the fluid. And a fluid rectifying mechanism for dispersing fluid flowing in the direction of the center of the cylinder toward the four corners and four sides of the cylinder.

According to the fluid rectifying mechanism of the present invention described above, the fluid that has flowed into the rectangular cylinder from the introduction portion is guided by the distribution rectifying plate and flows in the four corners and four sides of the cylinder,
Finally, the fluid is jetted from the jet nozzle with the flow velocity and temperature distribution of the fluid being uniform.

In this manner, a large amount of fluid can be made to flow in the vicinity of the four corners of the rectangular cylinder where the fluid usually hardly flows, and also a large amount of fluid can be made to flow along the side wall where the fluid is relatively hard to flow. As a result, the flow rate of the fluid flowing along the four corners and four sides of the rectangular cylinder increases, and the flow velocity and the temperature distribution of the ejected fluid can be made uniform.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of a first embodiment of a fluid rectification mechanism according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIGS. 3 and 4 are longitudinal sectional views of other embodiments. FIG.

In the present invention, a fluid introducing portion 3 is provided at a central portion on the upstream side of the tubular body (rectangular tubular body) 2, and between the introducing portion 3 and a rectifying portion composed of conventional rectifying plates 15, 16 and the like. Region 1 of
7, a distributed rectifying plate 1 is provided, and the fluid that has entered from the introduction portion 3 of the cylindrical body 2 by the action of the distributed rectifying plate 1
It will be dispersed in directions 0 to 13 and 4 to 8 sides.

In the distributed rectifier 1 of the present invention, in addition to the configuration shown in FIG.
Any shape may be used as long as it can be dispersed in eight directions.

In FIG. 2, for the sake of illustration, the distributed rectifying plate 1 is shown.
Are drawn in a state of floating in the flow path, but actually a mounting stay (not shown) is used, or a rectangular cylinder 2
The inner wall is directly attached to the inner wall by means such as welding or screwing.

In any case, the size of the cut-off portion of the corner of the distributed rectifier plate 1 and the size of the gap between the four sides and the rectangular cylindrical body 2 depend on the required fluid flow velocity and fluid temperature. It will be selected appropriately.

In the present invention, the presence of the above-mentioned distributed rectifying plate 1 forces the fluid which tends to flow in the vicinity of the center of the rectangular cylindrical body 2 where the resistance is small, forcibly at the four corners 10 to 1 of the rectangular cylindrical body 2.
3 and four sides 5 to 8 directions, the flow velocity is usually the slowest, and the fluid can be intensively flowed to a portion where the fluid temperature is most likely to be reduced due to the presence of the rectangular cylinder 2.
The flow velocity adjustment and the temperature distribution adjustment of the fluid are made uniform.

The fluid that has passed through the position of the above-mentioned distributed rectifying plate 1 is then subjected to rectifying sections such as the conventional rectifying plates 15 and 16 to make the flow velocity and the temperature distribution uniform as in the conventional case. Then, the fluid that has passed the rectifying portion position is jetted vigorously from the jet nozzles 4 with uniform flow velocity and temperature distribution.

[0023]

As described above, according to the present invention, when a fluid flows into the cylinder from the introduction portion, the fluid flows in the four corners and four sides of the cylinder by the distributed rectifying plate, and flows along the corners and the inner wall of the cylinder. Flows in the direction.

Therefore, first, by causing the fluid to flow in a portion where the flow velocity is likely to decrease, the cause of the difficulty in making the flow velocity uniform can be eliminated, and the uniform flow velocity can be easily secured. The cross-sectional area of the flow path can be freely selected by the rectifying plate, and there is an effect that the fluid can be passed in the range of the most suitable flow velocity.

Further, according to the present invention, since the fluid flowing from the introduction portion can be forced to flow along the corners and the inner wall of the cylinder, radiant heat (radiant heat) is generated from the inner wall of the cylinder and the downstream side is generated. Even if heat is gathered near the center of the rectification mechanism, the temperature of the fluid passing through the side wall is high, so that the vicinity of the side wall can be kept relatively high, and the temperature is lower than before. The cause of the difficulty in making the temperature distribution uniform is also eliminated, and an effect that a uniform temperature distribution can be secured can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a fluid rectification mechanism according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view of a fluid rectification mechanism according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a third embodiment of the fluid rectification mechanism according to the present invention.

FIG. 5 is a longitudinal sectional view of a conventional fluid rectification mechanism.

FIG. 6 is a longitudinal sectional view of another conventional fluid rectification mechanism.

FIG. 7 is a plan view of a conventional current plate.

FIG. 8 is an operation diagram showing a flow of a fluid in a conventional fluid rectification mechanism.

FIG. 9 is a graph illustrating a temperature distribution of an ejection fluid of a conventional fluid rectification mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dispersion rectifier plate 2 ... Cylindrical body (rectangular cylindrical body) 3 ... Introduction part of a rectangular cylindrical body 4 ... Injection nozzle of a rectangular cylindrical body 5-8 ... Four sides of a rectangular cylindrical body 10-13 ... Four corners of a rectangular cylindrical body 15, 16: conventional current plate 17: area

Claims (1)

[Claims] A rectifying section for rectifying a fluid flowing from the introduction section is provided in a cylindrical body near an upstream center of a rectangular cylindrical body, and a fluid rectified by the rectifying section is provided in the rectangular cylinder. In the rectifying mechanism of the fluid ejected from the ejection nozzle provided at the position of the lead-out portion of the body, the fluid flowing in the direction of the center of the cylinder into the region between the introduction portion and the rectifying portion of the fluid is provided at four corners and four sides of the cylinder A fluid rectification mechanism, comprising a distribution rectification plate for dispersing the fluid in the direction of the fluid.