JPS59147971A - Air jet type cooling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in the structure of an air jet type cooling device in which all of the cooling air is jetted out through slits.

(Conventional) Cooling methods using air jets are generally well known, and especially for single jets, entrainment (
It has been confirmed that the amount of air several times the amount of blown air can be obtained due to the presence of air entrainment, and efforts are being made to utilize it efficiently.

However, in conventional air jet cooling devices used industrially, as shown in FIGS. 1(a) and 1(b), multiple slits 2.2... , air A from a blower (not shown) is blown out as a jet stream B through the slits 2. In such a cooling device, the device becomes larger and the number of slits 2 increases. As a result, the entrainment of jet stream B from opening the valve decreases, and entrainment can only be expected at the end of the device/outside the device.For this reason, a blower of Inutani volume was required to obtain the specified cooling air volume. .

Furthermore, as shown by the line D[IB in FIG. 2, the wind speed characteristics are correlated with the position of the slit 2, making it difficult to obtain a uniform distribution state.

In addition, as shown in the figure, a vortex C is generated between the jet streams B, B, etc. blowing out from the slit 2, and a negative pressure region is formed, and due to this, the jet streams B interfere with each other. However, the disadvantage is that the flow tends to become unstable.
Depending on the application, uneven cooling may occur, causing problems.

(Object of the invention) In view of the problems of the prior art described above, the present invention aims to increase as much as possible the entrainment from the surroundings of the jet flow blown out from the slit, thereby obtaining a large cooling air volume with a small air flow @ air volume. The object of the present invention is to provide an air jet cooling system capable of obtaining a jet stream with a stable and uniform wind speed distribution.

(Structure of the Invention) This purpose is to arrange a subduct having a slit for blowing air at the upper end in a multi-belt configuration with an appropriate gap,
This is achieved by realizing an air jet type cooling device in which at least one of both ends of the subduct is connected to a main duct that communicates with a blower outlet, and an entrainment flow is induced using the gap. .

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 3(a), Φ) shows an example of the structure of an air jet type cooling device according to the present invention.

In these figures, 11 is a long subduct with a rectangular cross section, and a slit 12 is provided in the upper end of the subduct in the longitudinal direction. Reference numeral 13 denotes a main duct, which consists of a pair of body parts 13a, 13a arranged facing each other, a connecting part 131 that connects the body parts 13al13a, and an air supply port 13C. It communicates with the air blower outlet.

Therefore, the body portion 13a*i3a of the main duct 13
In between, a plurality of sub-ducts 11.11... serve as predetermined gaps 14.14..., and each sub-duct 11.11... communicates with the main duct 13 at both ends. are doing. Further, the subduct 11 is installed with its lower end spaced apart from the floor surface 15.

With this configuration, the air supply port 13 is removed from the blower outlet 70.
The air E pumped into the -C main duct 13 through Ci is branched into two directions at the connecting part 13b, and the branched air E reaches the body part 13al13a, and from there flows into the subduct 11. 1 slit 12
It blows out as a jet stream P. At this time, the air GK existing below the cooling device induces an entrainment flow H through the gap 14 between the subducts 11, and the entrainment flow) merges with the jet flow F and flows into the cooling device. It blows upwards.

In this way, an entrainment flow H is induced, fl,
As a result, a large amount of cooling air is blown out from this cooling device, but the air volume is usually several times the air volume of the blower, and the vortex shown in Figure 2 does not occur. A stable jet flow F is obtained.

Incidentally, in the cooling device having the above configuration, the middle pitch of the slits 12 is 6, the installation pitch of the slits 12 (jet flow F) is k 150 rrrm, and the gap 14 between the slits 12 (jet flow F) is 11.
When the air flow rate was set to 80 m/s and the blowing speed k of the jet stream F from the slit 12 was 10 m/s, the air volume at a position in front of the slit 12 at 200 m/s was actually measured. , its efficiency was confirmed.

In this embodiment, both ends of the sub-duct 11 are communicated with the main duct 13, but only one end may be communicated with the sub-duct 11, and instead of the slit 12, a large number of holes may be arranged.

FIG. 4 shows another embodiment of the inventive air jet cooling device. Components shown in FIG. 3 are designated by the same reference numerals, and explanations of their functions and effects will be omitted.

The present embodiment is characterized in that, in addition to the first embodiment, a rectifying pipe 20, which is a rectifying member, is provided at a position in front of the slit 12 and along the slit 12.

With this configuration, the jet stream F blown out from the slit 12 hits the rectifying pipe 2o and is dispersed laterally,
The entrainment flow H joins this flow, and the wind speed on the downstream side of the straightening pipe 20 is equalized.

FIG. 5 shows the wind speed characteristics of the water-containing one, where the horizontal axis shows the jet flow blowing position, that is, the installation position of the slit 12, and the vertical axis shows the wind speed at a predetermined position in front of the slit 12 [(workpiece conveyance position)]. m/S), and its correlation is shown in comparison with that without the rectifying pipe 20 (first embodiment).

From this, the one without the rectifying pipe 20 (first embodiment) represented by two curves in the figure has a sine curve-shaped wind speed distribution with a maximum value at the jet flow outlet position and a minimum value at an intermediate position. On the other hand, the one with the rectifying pipe 20 (second example) shown by the QItB line shows a uniform wind speed distribution depending on the jet flow outlet position, and therefore, the second example It can be said that the cooling device in the embodiment is particularly suitable for cooling a workpiece where uneven cooling is avoided.

Note that in the second embodiment, the rectifying pipe 20 is not limited to a circular pipe, and may be an elliptical or triangular pipe member or a rod member. Further, for example, cooling water may be circulated within the rectifying pipe 20, and the cooling effect is further enhanced by the action of the cooling water.

(Effects of the Invention) As described above in detail, the air jet cooling device according to the present invention is provided with a plurality of rows of subducts each containing air blowing slits, and the subduct 11'
In addition, a gap is provided between the subduct and the floor surface, and entrainment flow is induced along with the jet flow from the slit, so a cooling air volume several times that of the blow-in penetration scene can be obtained. Therefore, a large amount of cooling air can be achieved with a small-capacity blower, which is extremely effective in terms of energy conservation.

In addition, due to the presence of the entrainment flow mentioned above, a stable jet flow can be obtained, and furthermore, if a rectifying member is attached, it is possible to achieve a uniform wind speed distribution t'4, making it possible to apply this cooling device. The scope has been significantly expanded.

[Brief explanation of drawings]

Figures 1 (a) and (b) are a schematic diagram and a schematic sectional view showing the structure of a conventional air jet cooling device, and Figure 2 is a diagram showing air flow and wind speed characteristics in the conventional cooling device. FIG. 3(a), Φ) is a schematic plan view and a schematic sectional view showing an example of the structure of an air jet cooling device according to the present invention, and FIG. 4 is a cooling device according to another embodiment of the present invention. FIG. 5 is a schematic sectional view showing the entire structure of the cooling device, and FIG. 5 is a correlation diagram showing the wind speed characteristics of this cooling device.

Claims (2)

[Claims] (1) Multiple rows of subducts with air blowing slings (f) provided at their upper ends are arranged with appropriate gaps, and at least one of both ends of the subducts is communicated with the main duct which communicates with the air outlet in the first place. This is an air jet type cooling device. (2) The air jet cooling device according to claim 1, further comprising a rectifying member disposed in front of the slit and along the slit.