JPH04110166U - Horizontal hot air circulation baking furnace - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce uneven thickness of the enamel varnish coating layer and increase the running speed of the wire coated with enamel varnish when baking and fixing the wire coated with enamel varnish. To provide a horizontal hot air circulation baking furnace that has been improved so as to be able to. [Structure] In a horizontal hot air circulation baking furnace, a hot air suction port is installed on the side of the wall near the end of both the upper and lower walls of the four walls forming the work chamber on the side opposite to the air outlet. An upper suction port and a lower suction port each having an opening almost full width in the direction are provided, an upper suction duct is connected to the upper suction port, and a lower suction duct is provided connected to the lower suction port, and the upper and lower suction ports are provided. The lower suction ducts are merged to form a suction duct, and each of the upper and lower suction ducts is provided with an air volume adjustment device.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

In this invention, the inside of the work chamber is spaced almost horizontally in parallel with the hot air in the countercurrent direction. Multiple wire rods coated with enamel varnish are heated with hot air, Regarding a horizontal hot air circulation baking furnace for baking enamelled wire, which forms an enamel film layer on wire rods. Ru.

0002

[Conventional technology]

A conventional hot air circulation baking furnace 10 for baking enamelled wire is configured as shown in FIG. ing. That is, the horizontal hot air circulation baking furnace 10 is equipped with a horizontal hot air circulation baking furnace 10 which is coated with enamel varnish. It is equipped with a work chamber 12 for baking the running wire. workcha The member 12 has a hollow portion 13 which is elongated in the horizontal direction and has a substantially rectangular cross section. It is formed in the shape of a flat duct, and is heated to a predetermined temperature by the heater described below. The hot air is directed from one end opening 14 of the hollow part to the other end opening 16. flows. In the work chamber 12, a plurality of wire rods coated with enamel varnish are 18 denotes a workpiece from the other end opening 16 of the work chamber 12, that is, the wire inlet. The hot air enters the chamber 12 and travels parallel to and parallel to the hot air in a counter-current direction. One end opening 14 of the work chamber 12, ie, the wire outlet, enters the work chamber. It passes through the bar 12 and is heated by hot air while running, causing the enamel varnish to bake onto the wire. It sticks and sticks.

0003 The horizontal hot air circulation baking furnace 10 is equipped with an in-furnace circulation fan 20 that circulates the workpiece. It is connected to an air outlet 22 provided near the opening 14 at one end of the chamber 12. Hot air is blown into the work chamber 12 through the air duct 24, and the work chamber 12 is A suction port connected to a suction port 26 provided near the opening 16 at the other end of the chamber 12 The hot air is sucked through the drawing duct 28, and the blowing duct 24 and the work chamber 12 are The hot air is circulated through the suction duct 28 in the direction of the arrow shown in the figure. In order to exhaust part of the hot air sent out by the furnace circulation fan 20 to the outside of the furnace, An exhaust duct 30 is branched from the middle of the ventilation duct 24 and communicated with the ventilation duct 24. Exclusion In order to adjust the air volume, an exhaust damper 32 is provided in the exhaust duct 30. A blower damper 34 is provided in the blower duct 24 as required for adjustment. In the work chamber 12, the wire rod 18 coated with enamel varnish is heated. The temperature of the hot air itself decreases. Reheat the reduced temperature of hot air to a specified temperature Therefore, a heater 36 is provided in the middle of the suction duct 28. Furthermore, a suitable catalyst layer 38 for burning off the solvent evaporated from the enamel varnish. is installed between the heater 36 and the furnace circulation fan 20, and the exhaust duct 30 A space (not shown) that takes in an amount of air from outside that is equivalent to the amount of hot air exhausted from the An air intake device is provided.

[Problem that the idea aims to solve]

0004 In the conventional horizontal hot air circulation baking oven described above, fluid enamel varnish is applied. The original reason for running the cloth wire horizontally and in countercurrent to the hot air Due to the influence of gravity and hot air flow, uncured fluid enamel varnish During running, it flows especially near the suction port where the wire enters, causing the enamel varnish to bake and stick. Uneven thickness occurs in the enamel varnish coating layer during processing. Therefore, it is formed by baking. A defective enamelled wire product with uneven thickness in the enamel film layer occurred. If the speed of the hot air is lowered to reduce uneven thickness, the heating speed of the wire rod by the hot air will be reduced. As a result, it is necessary to slow down the running speed of the wire coated with enamel varnish. Therefore, the productivity of the baking process was reduced.

[0005] In view of the above problems, the present invention aims to fix the wire rod coated with enamel varnish by baking. When performing the treatment, it is possible to reduce uneven thickness of the enamel varnish coating layer, and Improved horizontal hot air to increase the running speed of wire coated with The purpose of the present invention is to provide a circulating baking furnace.

[0006]

[Means to solve the problem] The inventor of the present invention is biased towards the enamel varnish coating layer in the conventional horizontal hot air circulation baking oven. As a result of researching the causes of meat production, we focused on the following facts. In other words, the conventional horizontal In the type hot air circulation baking furnace, the hot air suction ports are connected to the four walls forming the work chamber. Since it is installed only on one wall, either the upper wall or the lower wall, the hot air is Air volume is sucked toward the suction port at one location, and heat is unevenly distributed inside the work chamber. Wind flow is formed, especially when the enamel varnish applied to the wire is still uncured. Disturbances in the flow of hot air are noticeable near the suction port in this condition. As a result, the wire becomes The wire rod entering the arc chamber is uncured and still has fluidity from the entrance to the suction port. As a result of the enamel varnish being pulled by the uneven flow of hot air, the enamel varnish It was discovered that uneven thickness occurred in the coating layer.

[0007] In order to deal with the above-mentioned causes of uneven thickness of the enamel varnish coating layer, the present inventor has developed the following characteristics. The purpose of the present invention was achieved by using a horizontal hot air circulation baking furnace with a configuration having the following characteristics. Its characteristics is the upper wall of the four walls that form the work chamber as a hot air suction port. Near the end of the side opposite to the air outlet of both the lower wall and the lower wall, the width of the wall in the horizontal direction is almost full. An upper suction port and a lower suction port each having an opening are provided and connected to the upper suction port. connect the upper suction duct to the lower suction port and provide a lower suction duct, respectively; and the upper and lower suction ducts are merged to form a suction duct; An air volume adjustment device was installed in each of the upper and lower suction ducts.

[0008]

[Effect]

Of the four walls forming the work chamber, the upper and lower walls are wide main walls. It forms a wall, and the two side walls are narrow. On the side of the wall near the ends of the two wide main walls. Each suction port has an opening that is almost full width in the direction, and each suction port has a The two connected branch suction ducts and the main suction duct where the two branch suction ducts merge. In addition, a suction duct consisting of two branch suction ducts is installed. Air volume control devices such as air plate type dampers and butterfly valve type dampers are installed. The amount of hot air sucked can be controlled by adjusting the amount of air sucked from each suction port. It can be finely adjusted at the top and bottom of the chamber. This allows the suction to This reduces turbulence in the flow of hot air and ensures that the hot air is evenly distributed within the work chamber. It can be made to flow parallel to the wire. As a result, the enamel varnish coating layer It is possible to reduce the degree of uneven thickness and increase the speed of hot air. Furthermore, since the width of the two side walls is narrow, it is certain that even if a suction port is installed there, the effect will be weak. Approved. Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0009]

【Example】

FIG. 1 showing an improved horizontal hot air circulation baking furnace 40 according to the present invention and main parts of the present invention The present invention will be described with reference to FIG. In addition, the conventional horizontal hot air circulation firing shown in Figure 3 The same parts as those in the furnace 10 are given the same reference numerals and the description thereof will be omitted. The line between the upper wall 42 and the lower wall 44 of the four walls forming the work chamber 16 Near the end of the material inlet side, there is an upper suction with an elongated opening that spans almost the entire width of the wall in the lateral direction. A pull port 46 and a lower suction port 48 are provided, respectively. Upper and lower suction ports 46 and The opening area of 48 is almost the same for both, and the size is only one location compared to the conventional type. The area should be somewhat larger than 1/2 of the area of the suction port. An upper suction duct 50 is connected to the upper suction port 46, and a lower suction duct is connected to the lower suction port 48. 52 are connected to each other, and these two ducts merge to form a suction duct. It becomes 28. In order to reduce the pressure loss of hot air in the duct, preferably the upper The upper connection duct 54 and the lower part which are the connection parts with the upper suction port 46 of the suction duct 50 The lower connection duct 56, which is the connection part of the suction duct 52 with the lower suction port 48, has a disconnection. Use a reducer-type duct joint that gradually reduces the area, and For bends, use bends with a large radius of curvature. The upper suction duct 50 and the lower suction duct 52 are joined together to form a suction duct. An air volume adjustment device that can adjust the volume of hot air sucked into the upstream side of the confluence point 58 An upper suction damper 60 and a lower suction damper 62 are provided, respectively. Real truth In this example, a butterfly valve type damper is used for the damper, but a slide plate Other types of dampers can be used, such as a double-barreled damper.

0010 With the above configuration, hot air is directed toward the work chamber 12 in the direction of the arrow shown in FIG. The wire can flow parallel to the wire in a uniformly distributed manner. A plurality of wire rods 18 coated with enamel varnish are inserted into the wire entrance, that is, the end opening 1. 6 into the work chamber 12, and almost the center of the work chamber 12. The wire is spaced apart in parallel and runs horizontally in countercurrent to the hot air flow, and the wire outlet, i.e., the end It exits from the opening 12. During this time, the enamel varnish is baked onto the wire and the enamel coating layer is removed from the wire. formed on the material.

[0011] In order to evaluate the performance of the improved horizontal hot air circulation baking furnace according to the present invention, the above implementation was carried out. Examples of improved horizontal hot air circulation baking furnace and conventional horizontal hot air circulation baking oven, respectively. using a polyester enamel varnish with a resin concentration of 30% at the same hot air temperature. A round wire rod with a diameter of 0.5 mm was baked to produce an enamelled wire with an outer diameter of 0.57 mm. Enamel baked using the improved horizontal hot air circulation baking furnace of the example The uneven thickness ratio (minimum film thickness/maximum film thickness) of the baked enamel film layer of wire wire products is 80 %, and the running speed of the wire was 40 m/min. On the other hand, conventional horizontal hot air circulation baking Thickness unevenness ratio of the baked enamel film layer of enameled wire products baked using a furnace was 70%, and the running speed of the wire was 35 m/min.

[Effect of the idea]

As explained above, wire rods coated with enamel varnish are baked to create an enamel finish. In the process of forming the coating layer on the wire rod, the improved horizontal hot air circulation sintering method according to the present invention is used. The furnace reduces uneven thickness of the enamel varnish coating layer and increases the running speed of the wire rod. This makes it possible to reduce the uneven thickness of the enamel film layer of enameled wire products and improve the enamel thickness. The productivity of the baking process can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an improved horizontal hot air circulation baking oven according to the present invention.

FIG. 2 is an explanatory diagram of the main parts of the improved horizontal hot air circulation baking furnace according to the present invention.

FIG. 3 is an explanatory diagram of a conventional horizontal hot air circulation baking furnace.

[Explanation of symbols]

10 Conventional horizontal hot air circulation firing oven 12 Work chamber 13 Hollow part 14 Outlet 16 for the wire with an enamel coating layer formed at one end of the work chamber Wire coated with enamel varnish at the other end of the work chamber Inlet 18 Wire rod 20 coated with enamel varnish Furnace circulation fan 22 Air outlet 24 Air duct 26 Suction port 28 Suction duct 30 Exhaust duct 32 Exhaust damper 34 Air damper 36 Heater 38 Catalyst layer 40 Improved horizontal type according to the present invention Hot air circulation baking furnace 42 Upper wall 44 Lower wall 46 Upper suction port 48 Lower suction port 50 Upper suction duct 52 Lower suction duct 54 Upper connection duct 56 Lower connection duct 58 Confluence point 60 Upper suction damper 62 Lower suction damper

Claims (1)

[Scope of utility model registration request] 1. A hollow portion having a substantially rectangular cross section that is elongated in the horizontal direction is formed in the shape of a duct horizontally in the longitudinal direction, and the hollow portion has an opening at one end and an opening at the other end opposite thereto. Hot air flows in a direction toward the opening, enters through the other end opening, runs parallel and spaced apart in countercurrent to the hot air, runs approximately horizontally through the hollow section, exits through the one end opening, a work chamber for heating a plurality of wire rods coated with enamel varnish passing through a hollow portion with the hot air to bake and fix the enamel varnish to the wire rods; and an opening at the one end of the work chamber. A suction duct that blows the hot air into the work chamber through a blower duct that is connected to an air outlet provided nearby, and that is connected to a suction port that is provided near the other end opening of the work chamber. In a horizontal hot air circulation baking furnace, the furnace is equipped with an in-furnace circulation fan that sucks the hot air through the air circulation fan, which serves as the suction port on both the upper wall and the lower wall of the four walls forming the work chamber. An upper suction port and a lower suction port are provided near the end of the side opposite to the air outlet, respectively, and the upper suction port and the lower suction port have an opening that covers almost the entire horizontal width of the wall, and are connected to the upper suction port to form an upper suction duct and the lower A lower suction duct is provided connected to the suction port, the upper and lower suction ducts are merged to form the suction duct, and an air volume adjustment device is provided for each of the upper and lower suction ducts. Features a horizontal hot air circulation baking furnace.