JPH0628593U - Continuous drying oven - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the pressure loss during the flow of drying air and downsize the air circulation fan and the entire drying furnace. [Structure] A chain for conveying processed products from an inlet 6 to an outlet 7.
On the upper side wall 2a and the lower side wall 2b of the drying chamber 4 including the conveyor 8, a blowout port 31 and an exhaust port 32 having rectangular openings are provided in parallel. A multi-blade fan 11 is formed by rotatably supporting an impeller in which elongated blades curved in a concave shape with respect to the rotation direction are fixedly mounted on the circumference in a casing 13 having a suction port and a discharge port. It is arranged outside the upper side wall 2a and the lower side wall 2b, the discharge port and the outlet port 31 thereof are connected, and the suction port and the exhaust port 32 are connected via a wide elbow-shaped duct 33. Provide a heater.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a continuous drying furnace for drying wet treated products such as machine parts to which a cleaning liquid is attached by blowing hot air or hot air.

[0002]

[Prior art]

 As a conventional drying oven of this type, for example, as shown in FIG. 4, an inside having a slit-shaped outlet 62 at the upper and lower portions of a tunnel-shaped drying chamber 61 in which a processed product is conveyed by a chain conveyor 8. An internal duct 64 having a duct 63 and a similar exhaust port is provided over the entire length of the furnace, and the air sucked by the blower 66 from the internal duct 63 via the external duct 65 is passed through the connecting duct 67. A structure is generally used in which heated air is sent to the Tabox 68 and is supplied to the inside duct 63 through the outside duct 69 for air supply and blown out from the blowout port 62.

[0003]

[Problems to be solved by the device]

 However, in the continuous drying furnace 60 having the above-mentioned configuration, in addition to having the long internal ducts 63 and 64 in the furnace body, it is necessary to provide the long ducts 65, 67, 69 outside the furnace. Therefore, the pressure loss of the circulating air through each duct is large, the blower is large, the driving power is large, and the entire drying furnace is large, and the structure is complicated and the manufacturing cost is high.

The present invention solves the above-mentioned conventional problems, in which the pressure loss associated with the flow of drying air is small, the fan for air circulation can be of small size and small capacity, and the entire drying furnace is small and simple. It is intended to provide a continuous drying oven which can be manufactured at low cost.

[0005]

[Means for Solving the Problems]

 The continuous drying oven of the present invention has a blower outlet having a rectangular opening and an exhaust outlet arranged on at least one side wall of a drying chamber having a conveyor for transporting processed products from an inlet to an outlet. In addition to the installation, the impeller, in which elongated blades that are concavely curved with respect to the direction of rotation are arranged side by side on the circumference, is rotatably supported in the casing that has a curved flow path from the suction port to the discharge port. A multi-blade fan formed on the outside of the side wall, the discharge port is connected to the outlet port, and the suction port and the exhaust port are connected via a wide elbow-shaped duct. It is characterized in that a heater for heating the circulating air is provided therein.

[0006]

[Action]

 In the continuous drying oven of the present invention, the drying air sucked from the exhaust port is heated by the heater while flowing through the wide elbow-shaped duct, and is heated by the multi-blade fan. It is pumped and blown out from the air outlet into the drying chamber, and the processed product conveyed by the conveyor is dried.

In the furnace, there is no internal duct extending over the entire furnace length as in the conventional case, and the duct length for air circulation outside the furnace (the flow path length in the air flow direction) is extremely shorter than that of the conventional duct. Therefore, the pressure loss due to the circulation of the drying air is small, the fan only needs to have a small size and a small capacity, and the entire drying furnace can be downsized.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, reference numeral 1 denotes a furnace body, which is formed by fixing support legs 3 to a rectangular tube-shaped furnace body 2 composed of an upper side wall 2a, a lower side wall 2b, and side side walls 2c and 2d. Reference numeral 4 denotes a drying chamber formed in the furnace main body 2, which is provided with a chain conveyor 8 that conveys the processed product 5 from an inlet 6 to an outlet 7.

The chain conveyor 8 also serves as a conveyor for a cleaning device on the front process side (not shown), and is driven in the direction of the arrow by a drive mechanism (not shown). The lower side of the furnace body is indicated by the arrow on the return side. Pass in the opposite direction. Reference numeral 9 is a guide rail for the chain conveyor 8. However, these are not shown in FIG. 1, and the chain conveyor is also shown.

In FIG. 1 and FIG. 2, 11 is a multi-blade fan, which comprises an impeller 12 and a casing 13 that rotatably supports the impeller 12. The impeller 12 has a large number of elongated blades 14 curved in a concave shape with respect to the rotation direction, arranged side by side on the circumference, and both ends of which are fixed to the disks 15, 15 and supported by these disks. The shaft 16 is provided so as to project. Further, the casing 13 has a rectangular suction port 17 extending in the longitudinal direction of the impeller 12 and a curved flow channel 19 leading to a rectangular discharge port 18 opening in a plane orthogonal to the suction port 17. Both ends of a bending wall 20 forming an inner peripheral wall surface and a bending wall 21 forming an outer peripheral wall surface of 19 are fixed to side plates 22 and 22. The impeller 12 is housed in the casing 13 so as to cross the flow passage 19, and the support shaft 16 is rotatably supported by a bearing attached to the side plate 22. An electric motor 23 drives the impeller 12 by a belt.

On the upper side wall 2a and the lower side wall 2b of the drying chamber 4, a blowout port 31 and an exhaust port 32 having openings each having a rectangular shape (planar shape) are provided in parallel. In this embodiment, the blowout port 31 and the exhaust port 32 are oriented in the longitudinal direction of the furnace. The multi-blade fans 11 are attached to the upper side of the upper side wall 2a and the lower side of the lower side wall 2b, respectively, with their long sides oriented in the furnace length direction.

The outlet 18 of this fan is connected to an outlet 31. Further, 33 is a wide elbow-shaped duct which is composed of an elongated box-shaped body with two adjacent side surfaces open, and its inlet 34 is the exhaust port 32 of the furnace main body 2 and its outlet 35 is the suction of the multiblade fan 11. Each is connected to the mouth 17. Reference numeral 36 is an electric heating type heater for heating air, and a plurality of heaters 36 are arranged in parallel in the duct 33.

In the continuous drying furnace 40 having the above-mentioned configuration, when the multi-blade fans 11 are driven by the electric motor 23, the air in the drying chamber 4 sucked from the exhaust port 32 passes through the duct 33. The heated product 36 is heated by the heater 36 and blown into the drying chamber 4 through the blow-out port 31 to dry the processed product 5 conveyed by the chain conveyor 8.

Since the heater 36 is provided on the suction port 17 side of the multiblade fan 11, the air discharged from the discharge port 18 has a relatively uniform flow velocity distribution with little turbulence and passes through the blowout port 31. It flows into the drying chamber 4 and the processed product 5 can be uniformly dried with relatively evenness.

In this embodiment, since the longitudinal directions of the air outlet 31 and the multi-blade fan 11 are oriented in the furnace length direction, that is, the treated product conveying direction, one treated multi-blade fan is used for the treated product 5. Since heated air is blown over a long distance during the conveyance in the furnace, it is possible to efficiently perform drying with a small number of multiblade fans.

Next, FIG. 3 shows another embodiment of the present invention, in which the longitudinal direction of the air outlet 31, the exhaust port 32, and the multiblade fan 11 is set in a direction orthogonal to the furnace length direction (furnace width direction). The multi-blade fan 11 is provided on each of the upper side and the lower side of the furnace main body 2, and two sets of outlets 31 and exhaust ports 32 are provided on each side. Since they are the same, the corresponding parts are shown with the same reference numerals as those in FIG. 1, and detailed description thereof is omitted.

In the continuous drying oven 50 of this embodiment, even if the dimension W (see FIG. 2) in the oven width direction of the treated article 5 is large and the oven width of the oven main body 2 is large, the unevenness of drying of the treated article 5 is caused. It is preferable because it can be reduced.

The present invention is not limited to the above-described embodiments, and for example, the multiblade fan 11, the air outlet 31, and the exhaust port 32 may be provided only on one of the upper side wall 2a and the lower side wall 2b. However, it may be provided on both or one of the side sidewalls 2c and 2d. Further, depending on the sizes of the multi-blade fan 11 and the duct 33, a short duct may be interposed between the discharge port 18 and the blowout port 31. Further, a conveyor other than a chain conveyor may be used as a conveyor for conveying the processed product 5, and a heater other than an electric heating type may be used.

[0019]

[Effect of device]

 As described above, according to the present invention, the drying air sucked from the intake port provided on the side wall of the drying chamber through the wide elbow duct is discharged from the discharge port of the multiblade fan to the outlet port provided on the side wall. Since it is blown out into the drying chamber via the air flow, the pressure loss due to the circulation of the drying air is small, and the fan for air circulation can be of small size and small capacity. Is also cheap.

[Brief description of drawings]

FIG. 1 is a perspective view of a continuous drying oven showing an embodiment of the present invention.

2 is a cross-sectional view of a cross section perpendicular to the furnace length direction of the continuous drying furnace of FIG.

FIG. 3 is a view corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 4 is a perspective view showing an example of a conventional continuous drying furnace.

[Explanation of symbols]

2 ... Furnace body, 2a ... Upper side wall, 2b ... Lower side wall, 2c ...
Side wall, 2d ... Side wall, 4 ... Drying chamber, 5 ... Processed product,
6 ... Inlet, 7 ... Exit, 8 ... Chain conveyor, 11 ... Multi-blade fan, 12 ... Impeller, 13 ... Casing, 14 ... Blade, 17 ... Suction port, 18 ... Discharge port, 19 ... Flow path, 23 ...
Electric motor, 31 ... Blowout port, 32 ... Exhaust port, 33 ... Duct,
34 ... Inlet, 35 ... Exit, 36 ... Heater, 40 ... Continuous drying oven, 50 ... Continuous drying oven.

Claims (1)

[Scope of utility model registration request] 1. At least one side wall of a drying chamber provided with a conveyor for transporting a processed product from an inlet portion to an outlet portion,
An impeller in which an outlet and an exhaust port, each of which has a rectangular opening, are arranged in parallel, and elongated blades curved in a concave shape in the rotation direction are arranged in parallel on the circumference of the impeller is provided from the suction port to the discharge port. A multi-blade fan, which is rotatably supported in a casing having a curved flow path extending to, is disposed outside the side wall, the discharge port is connected to the blow-out port, and the suction port and the A continuous drying oven, characterized in that the exhaust port is connected through a wide elbow-shaped duct, and a heater for heating circulating air is provided in the duct.