JPH07139812A - Hot air supply mechanism - Google Patents

Abstract

PURPOSE:To make a hot air supply mechanism compact by installing a hot air collecting taper plate in the shape of a tapering tube on the inner wall of a tubular casing on the hot air discharge port side and by providing a straightening plate in an opening part on the hot air discharge port side in the hot air supply mechanism having a heat generator built in the tubular casing. CONSTITUTION:Heat generators 2 such as heaters are provided in a plurality of lines in a tubular casing 1 in accordance with the dimensions of the cross-sectional area of the tubular casing 1. In an opening on the start end side of this tubular casing 1, an introducing port 3 for introduction of air is provided and the air is supplied thereinto from a compressor or the like. Besides, a hot air collecting taper plate 5 in the shape of a tapering tube is installed on the inner wall of the tubular casing 1 on the hot air discharge port 4 side just behind the position of installation of the heat generators 2, and a baffleplate 7 is provided in the rear of an opening part 5a formed substantially in the vicinity of the center on the hot air discharge port 4 side of the taper plate 5, with an appropriate uniform gap 6 left in the periphery of the opening part 5a. Branching bent parts 8 for making hot air branch just behind the straightening plate are formed in the tubular casing 1 on the hot air discharge port 4 side of the position of installation of the straightening plate 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air supply mechanism, and more particularly to a hot air supply mechanism in which a heat generating portion serving as a heat source for hot air is installed in a tubular casing, and a branch portion is provided at a hot air discharge port located at the end position of the mechanism. And a hot air supply mechanism provided with a bent portion.

[0002]

2. Description of the Related Art Generally, a hot air supply mechanism has a plurality of rows of heaters built in a tubular casing, and air is introduced from an inlet located at the starting end of the tubular casing to heat the air at a heat generating portion. To generate hot air, and to send the hot air to the target device or pipe from the hot air outlet located at the end position of the tubular casing.

[0003]

By the way, in the case where the above-mentioned tubular casing is linear and the hot air outlet is provided on the straight extension line of the heat generating portion (so-called straight type), the hot air outlet generates heat. If it is deviated from the straight extension line of the section (curve type with so-called divergence section or bent section), the air trying to go straight hits the end wall in the straight traveling direction and is bent left or right or up and down suddenly. Due to such air bending and a difference in the balance of the air pressures of the pipes after branching, uneven flow is generated in the passing air in the tubular casing.

This uneven flow affects the passage speed of the air passing through the heat generating portion in the cylindrical casing, and the air passing speed is variously changed depending on the portion of the heat generating portion. As a result, heat is generated at a portion where the air passing speed is slow. There has been a problem that abnormal heating phenomenon occurs in the heat generating part, and eventually the durability of the heat generating part is impaired.

Therefore, in the conventional hot air supply mechanism,
In order to prevent the occurrence of the above-mentioned uneven flow from adversely affecting the heat generating portion, the straight cylindrical portion 10 which is secured a considerable distance from the heat generating element is always formed at the rear portion of the heat generating element in the cylindrical casing. At the tip portion of 10, the contrivance was made to form a branched portion or a bent portion for changing the path of hot air.

For this reason, the conventional hot air supply mechanism requires an excessively large installation area in order to dispose the hot air supply mechanism at an installation location where the space is limited, and also in the straight tube portion 10, radiant heat loss is caused in the pipe. However, there is a problem in that

Further, when the sensor of the hot air temperature controller is attached to a branch portion or a bent portion (hereinafter referred to as "branch bent portion" together), the distance between the heating element and the sensor becomes long, resulting in heat generation. There is a large temperature difference between the hot air temperature near the body and the hot air temperature near the sensor installation position, the temperature correction instruction signal from the sensor is delayed, and there is a large time lag in the response of the temperature controller. there were.

In order to solve the above-mentioned problems, the present invention provides a hot air supply mechanism in which a heat generating portion for generating hot air and a branched bent portion of a cylindrical casing are brought close to each other and integrated. .

[0009]

Therefore, according to the present invention, in a hot air supply mechanism in which a heating element is incorporated in a tubular casing, the inner surface of the tubular casing on the hot air outlet side immediately after the heating element installation position is provided. A tapered hot air collecting taper plate is installed, a straightening plate is provided in the opening on the hot air discharging port side of the hot air collecting taper plate with a uniform gap, and the hot air collecting port side cylindrical position of this straightening plate installation position A hot air supply mechanism having a casing formed in a branched bent portion serves as a means for solving the problem.

[0010]

According to the present invention, the air flowing in from the blowing port flows toward the hot air outlet while being heated by the heating element, and the hot air is the hot air installed on the inner wall of the cylindrical casing on the hot air discharging side of the heating element installation portion. By the collecting taper plate, it is collected near the center of the passage and comes into contact with the current plate.

Next, the hot air passes through an appropriate uniform gap formed between the opening on the hot air outlet side of the hot air collecting taper plate and the straightening vane while maintaining the uniformity of the passing speed, and the hot air of the straightening vane is It is released to the outside while being divided into a flow that is released at the rear and is directed directly to the hot air discharge port that is bent at a right angle, and a flow that is in contact with the discharge side shield plate and bounces back toward the hot air discharge port.

After passing through the structure of the hot air collecting taper plate and the straightening plate, turbulent flow or rotating vortex is generated in the tubular casing, and the hot air flow rate is non-uniform to the hot air outlet of the multi-branching specification. According to the present invention having the above-described configuration, even if the above occurs, it does not affect the flow of air passing through the heat generating portion.

However, in the present invention, the flow velocity of the hot air is rectified in front of the rectifying plate installation position so that the turbulent flow and the rotating vortex are not generated at that position.

Further, the temperature control sensor mounting portion is mounted near the center position of the intermediate portion between the heating element and the rectifying plate. By integrating the functions described above, the piping of the hot air facility can be simplified and the installation area of the facility can be greatly reduced. Moreover, since the structure is simplified, the equipment can be supplied at low cost.

[0015]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited thereto.

In the present invention, a heating element 2 made of, for example, a heater is built in a cylindrical casing 1 having an appropriate cross-sectional shape such as a round shape or a square shape.

The heating elements 2 are provided in a plurality of rows according to the size of the cross-sectional area of the cylindrical casing 1, but the example of the drawing shows four rows. The heating element may be formed by folding one piece into a plurality of rows, or may be prepared by preparing a plurality of heating elements that are originally separate bodies.

An inlet 3 for introducing air into the tubular casing is provided at the opening on the starting end side of the tubular casing 1, and the air is sent through a compressor, a blower, a fan (not shown) and the like.

This air passes through the position of the heating element 2 to become hot air, and then advances toward the hot air outlet 4 of the tubular casing.

Here, in the present invention, a hot air collecting taper plate 5 having a tapered tubular shape is installed on the inner wall of the tubular casing 1 on the hot air outlet 4 side immediately after the installation position of the heating element 2.

Further, a uniform gap 6 is formed at an appropriate interval around the opening 4a formed near the center of the hot air collecting taper plate 5 on the hot air outlet 4 side, and the uniform gap 6 is formed.
The current plate 7 is provided behind the opening 4a. The specific interval of the uniform gap 6 has a considerable width because it is determined depending on the scale of the equipment and the degree of adjustment of the required air volume, but it is generally several millimeters to 6 cm.

The current plate 7 may be of any suitable shape, but in particular, if the entire surface has a convex surface shape or a hemispherical surface shape as shown in the figure, hot air flows smoothly along the surface of the current plate. It has the characteristics that it becomes easier to flow and the rectifying effect is further enhanced.

By providing this straightening vane 7, the flow velocity of the hot air in front of the straightening vane (on the side of the heating element) becomes uniform, and the occurrence of a drift in the heat generating portion is prevented.

In the tubular casing 1 on the side of the hot air outlet 4 at the position where this straightening vane is installed, it is not necessary to secure a straight tubular portion as in the conventional case, so that the portion immediately behind this straightening vane is immediately branched in an appropriate direction. It is possible to form the branched bent portion 8 by bending or bending.

The hot air reaching the branched bent portion 8 hits the end wall 9 of the tubular casing 1 in the straight traveling direction, and due to a sudden air bend, a difference in the air pressure balance between the pipes after branching, etc. Although a drift may be generated at a position, in the present invention, since the position is behind the position of the current plate, the adverse effect of the occurrence of the drift does not affect the position of the heating element.

The hot air supply mechanism of the present invention can be applied not only to the horizontally long cylindrical casing (horizontal type) shown in the figure, but also to the vertically long cylindrical casing (longitudinal type). .

Further, when the vertically-placed cylindrical casing 1 is installed, the installation area of the equipment is extremely small.

In the case of this vertical type cylindrical casing, the introduction port 3 may be provided in a direction orthogonal to the longitudinal direction of the heat generating element if necessary, but in that case, it is also provided in the vicinity of the introduction port. It is desirable to install the same structure as the hot air collecting taper plate 5 and the current plate 6.

The temperature controller sensor 11
Is provided at a position close to the surface of the central portion of the straightening vane as shown in FIG. 1, it is possible to detect the accurate temperature of the hot air, and the temperature of the hot air is the hot air outlet of the tubular casing. Even in the case, the temperature hardly drops.

[0030]

As described above, the hot air supply mechanism of the present invention does not require an unnecessary straight tubular portion, so that the overall structure is compact, and it has a feature that a small installation area can be sufficiently dealt with, and the structure is simple. It has the excellent effect of reducing the equipment cost because it is realized.

Further, the radiant heat loss from the cylindrical casing and the pipes after passing through the position of the heating element is reduced, and the sensor is installed near the surface of the rectifying plate, which enables accurate temperature control. There is also.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of the present invention.

FIG. 2 is a front view of a hot air collecting taper plate.

FIG. 3 is a vertical sectional view of the same.

FIG. 4 is a front view of a current plate.

FIG. 5 is a vertical sectional view of the same.

FIG. 6 is a vertical sectional front view of a conventional hot air supply mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical casing 2 Heating element 3 Inlet of cylindrical casing 4 Hot air discharge port of cylindrical casing 5 Hot air collecting taper plate 5a Opening of hot air collecting taper plate 6 Uniform gap 7 Straightening plate 8 Branching bent portion 9 End wall 10 Straight line Tube part 11 sensor

Claims (3)

[Claims] 1. In a hot air supply mechanism having a heating element built into a tubular casing, a tapered tubular hot air collecting taper plate is installed on the inner wall of the tubular casing on the hot air outlet side immediately after the heating element installation position. Then, a straightening vane is provided in the opening on the hot air outlet side of the hot air collecting tapered plate with a uniform gap, and the tubular casing on the hot air exhaust port side at the position where the straightening vanes are installed is formed in the branch bent portion. Hot air supply mechanism. 2. The hot air supply mechanism according to claim 1, wherein the current plate has a convex surface shape facing the heating element. 3. The hot air supply mechanism according to claim 1, wherein the current plate has a hemispherical surface shape toward the heating element.