JPH04128838U - hot air nozzle - Google Patents

Abstract

(57) [Summary] [Purpose] Simplified level adjustment between hot air nozzles placed above and below the running web. [Structure] Hot air chambers 13 and suction chambers 14 are alternately and continuously arranged to form a chamber group 15. These chamber groups 15 are arranged one above the other with the traveling web 6 in between, and the nozzles 13a of the hot air chamber 13 are opposed to each other at both ends thereof, and the nozzles 13a of the hot air chamber 13 and the nozzles 14a of the suction chamber 14 are opposed to each other in the middle part thereof. I let it happen.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be applied to dryers for paper coaters, dryers for offset rotary presses, etc. Regarding wind nozzles.

0002

[Conventional technology]

In general, with offset web presses, ink is applied to the web and then passed through a dryer to dry it. dry The hot air nozzle used in this dryer is an airfoil type. As shown in Fig. 4, this airfoil nozzle is connected to the outlet 2 of the nozzle body 1. A jet deflection curve is provided on both sides of the pocket box 4 through its side walls and the slit 3. Forming a surface 5, the nozzle body 1 is alternately arranged above and below the web 6 (staggered arrangement), The hot air enters the hot air chamber 8 from the hot air intake duct 7 and is rectified through the rectifying plate 9. After colliding with the web 6 through the slit 3 and becoming a wall jet on the web 6, The hot air discharged through the hot air outlet 10 and ejected from the slit 3 at that time is released from the core. effect (when hot air blows out, a low-pressure vortex is created between the hot air and the curved surface 5, and the hot air 5), the flow is deflected into the pocket area 11 and flows out into the web. 6 float (levitation) is the dynamic pressure of the collision area 12 from the slit 3 and the pocket area 1 This is achieved by a static pressure of 1.

0003 In addition, the hot air that has passed through the hot air outlet 10 is once discharged into the dryer and then discharged from the casspore. or circulation fan.

0004

[Problem that the idea aims to solve]

Each hot air nozzle used in conventional dryers was composed of a single unit. Therefore, it is necessary to adjust the level between nozzles (gap and pitch between nozzles). The quality of the accuracy affects the running of the web (paper). For example, dryer nozzles for printing machines have a narrow gap of 9 to 10 mm between the nozzles. Therefore, if the installation error is ±1mm or more, the web may touch the nozzle and stain the printing surface. There were other problems.

[0005] Furthermore, the opposing surfaces of each nozzle are conventionally spaces, and there is no particular pressure adjustment in the spaces. and exhaust Because exhaust is exhausted from a fixed point in the drying device that makes up the nozzle group, the pressure drop is balanced. Due to this, the pressure in the space between the nozzles varies greatly, and the flow of hot air blown out becomes uneven. However, there are problems such as a decrease in the heat transfer coefficient in the wall jet area and poor sheet running performance. It was.

[0006] As is clear from the conventional example, when the nozzles are placed opposite each other, the sheet flaps significantly. Therefore, it is preferable to arrange the nozzles in a staggered manner. This invention was developed to deal with such problems, and each nozzle is integrated into one. The purpose is to create a structure.

[0007]

[Means to solve the problem]

1 to 3, which correspond to embodiments of the configuration of the present invention to achieve the above object, are shown in FIGS. To explain, the present invention alternates between the hot air chamber 13 and the suction chamber 14. A group of chambers 15 are formed by continuously arranging the chambers 15, and the group of chambers 15 is connected to the running web 6. The nozzles 13a of the hot air chamber 13 are connected to each other at both ends. The nozzle 13a of the hot air chamber 13 and the suction channel face each other and are located in the middle thereof. It is characterized in that the nozzle 14a of the bar 14 is opposed to the nozzle 14a.

[0008]

[Effect]

The present invention uses the above-mentioned method to provide a nozzle for each hot air chamber provided on both sides. The nozzle prevents air stagnation between the nozzles and improves the heat transfer coefficient. The pressure between the hot air nozzles can be set arbitrarily by adjusting the exhaust air volume. The seat running performance is adjusted almost uniformly and becomes more stable without fluttering. Ru.

[0009] Furthermore, the hot air sucked in from this suction chamber is integrated into one duct and recirculated. This allows you to maintain a uniform temperature inside the dryer, making it easy to control the hot air temperature. The hot air nozzle, suction chamber and wind nozzle are integrated. Therefore, the gap between nozzles can be easily adjusted.

0010

【Example】

An embodiment of the present invention will be described below based on FIGS. 1 and 2. In the figure, 13 is a hot air chimney. 14 indicates a suction chamber, and these hot air chamber 13 and suction chamber The chambers 14 are arranged alternately to form a continuous chamber group 15, and the suction chambers are arranged alternately to form a continuous chamber group 15. The member 14 is connected to the fan 17 via an exhaust duct 16 and also connects to the hot air chimney. The chamber 13 was connected to a hot air source (not shown) via a hot air intake duct 18.

[0011] The chamber groups 15 are arranged above and below with the running web 6 in between, and both ends thereof are In this case, the nozzles 13a of the hot air chamber 13 face each other, and the hot air chamber 13a faces each other in the middle part. The nozzle 13a of the chamber 13 and the nozzle 14a of the suction chamber 14 face each other. Sea urchins were placed in the sea urchin. In the illustrated example, the nozzle 13a of the hot air chamber 13 is formed into a slit. At the same time, the nozzle 14a of the suction chamber 14 is formed into a group of circular holes with a small diameter. As shown in FIG. 3, the nozzle 13a of the hot air chamber 13 is also formed into a group of small diameter circular holes. Good too.

0012

[Effect of the idea]

In this way, according to the present invention, the hot air chamber and the suction chamber are connected alternately. The chambers are arranged in series to form a chamber group, and the chamber groups are arranged above and below with the running web in between. The nozzles of the hot air chamber are facing each other at both ends, and the middle part is Is the nozzle of the hot air chamber and the nozzle of the suction chamber facing each other? The entire chamber group has an integral structure on the top and bottom, and the nozzles are paired at both ends. The hot air chambers are placed facing each other to prevent air from stagnation between the nozzles and prevent interference between the nozzles. The heat transfer rate is high, the dryer length can be significantly shortened, and the suction chamber can be prevented. The pressure in the width direction of the sheet is evened out by sucking out the hot air from the hot air chamber. Since it is kept at the same level, the running performance of the sheet is extremely stable even against fluctuations in tension speed, etc. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a view taken along line AA in FIG. 1;

3 is a view taken along the line A-A in FIG. 1 according to a second embodiment of the present invention; FIG.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

6 Running web 13 Hot air chamber 13a nozzle 14 Suction chamber 14a nozzle 15 Chamber group

Claims (1)

[Scope of utility model registration request] Claim 1: Hot air chambers and suction chambers are alternately and continuously arranged to form a chamber group, and the chamber groups are arranged one above the other with a running web in between, and the nozzles of the hot air chambers are opposed to each other at both ends thereof. A hot air nozzle characterized in that a nozzle of a hot air chamber and a nozzle of a suction chamber are opposed to each other at an intermediate portion thereof.