JP6604482B2 - heating furnace - Google Patents

Description

  The present invention relates to a heating furnace with improved heat insulation.

  Conventionally, a heating furnace provided with heating means such as a gas burner or a heater is known as a heat treatment apparatus for heating an object to be heated. Some of such heating furnaces are provided with an intake / exhaust pipe that urges the inside of the heating furnace in order to eliminate pressure fluctuations in the furnace due to exhaust of combustion gas, heating and cooling, and the like.

  As such a heating furnace, for example, in Patent Document 1, a gas burner that opens toward the inside of the furnace and heats an object to be heated, an exhaust duct that passes through the furnace wall, and an interior of the furnace are provided. A fan that circulates the gas in the furnace, a drive source that drives the fan, and a drive shaft that passes through the furnace wall and transmits a drive force between the fan and the drive source. An equipped gas burner furnace is disclosed. In this gas burner furnace, the combustion gas from the gas burner is circulated in the furnace by a fan, the object to be heated is heated, and the combustion gas in the furnace is exhausted to the outside through an exhaust duct.

JP 2004-144421 A

  In the gas burner furnace described in Patent Document 1, since the drive shaft and the exhaust duct that drive the fan penetrate the furnace wall, the heat in the gas burner furnace is transmitted through the drive shaft and the exhaust duct that penetrates the furnace wall. There is a problem of running outside.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a heating furnace in which the heat in the heating furnace is difficult to escape to the outside of the furnace and the heat insulation is improved.

In order to solve the above problems, a heating furnace according to the present invention is a heating furnace provided with a conveying means and a blower fan for moving a workpiece in the furnace body,
Intake means for introducing outside air into the furnace body;
Exhaust means for exhausting gas in the furnace body;
A fan drive source provided outside the furnace body for driving the blower fan;
A hollow fan drive shaft that passes through the furnace wall of the furnace main body while maintaining airtightness and transmits a driving force between the blower fan and the fan drive source,
A conveyance drive source provided outside the furnace body for driving the conveyance means;
A hollow conveyance drive shaft that penetrates the furnace wall of the furnace main body while maintaining airtightness and transmits a driving force between the conveyance means and the conveyance drive source, and
The intake means introduces outside air into the furnace body through the hollow fan drive shaft,
The exhaust means exhausts gas to the outside through the hollow conveyance drive shaft.

  ADVANTAGE OF THE INVENTION According to this invention, the heat in a heating furnace makes it difficult to escape outside a furnace, and can provide the heating furnace which improved heat insulation.

It is a schematic perspective view of the heating furnace which concerns on one Embodiment of this invention. It is sectional drawing along the AA line of the heating furnace shown in FIG.

Hereinafter, the heating furnace which concerns on one Embodiment of this invention is demonstrated in detail based on FIG.1 and FIG.2.
The heating furnace 1 of this embodiment is for heat-treating the article to be heated 3 (work), and includes an intake / exhaust mechanism for ventilating the inside of the furnace body. As shown in FIGS. 1 and 2, the heating furnace 1 conveys the article 3 to be heated into the furnace body 5, the air blowing means 7 for circulating the gas (heating gas) in the furnace body 5, and the furnace body 5. Conveying means 9, intake means 11 for introducing outside air into the furnace body 5, exhaust means 13 for exhausting gas in the furnace body 5, and heating means 15 for heating the inside of the furnace body 5 are provided.

  The furnace body 5 is formed of a heat-insulating furnace wall, and is a casing that enhances hermeticity and makes it difficult for internal heat to escape to the outside. ing. The doors 17 and 17 are opened and closed by air cylinders 19 and 19 arranged outside the furnace body 5. One end side of the chains 23 and 23 is attached to the cylinder rods 21 and 21 of the air cylinders 19 and 19. The other ends of the chains 23 and 23 are attached to the doors 17 and 17. The chains 23, 23 are hung on sprockets 25, 25, and the sprockets 25, 25 are supported by support members 27, 27 fixed to the furnace upper wall of the furnace body 5.

  The air blowing means 7 includes a sirocco fan 29 (air blowing fan) and a fan drive source 31 that drives the sirocco fan 29. The sirocco fan 29 is arranged in the upper part inside the furnace body 5, sucks the heated gas heated by the heating means 15, blows it out, and circulates the heated gas in the furnace body 5. The sirocco fan 29 is connected to a fan drive shaft 33 (see later) of the sirocco fan drive source 31.

  The fan drive source 31 includes a motor for driving the sirocco fan 29. The motor includes a rotor 31a, a stator 31b, bearings 31c and 31c, a housing 31d, and a fan drive shaft 33. . This fan drive source 31 is installed in the approximate center of the upper wall of the furnace body 5 via the flange 31e. The fan drive shaft 33 is hollow, and rotatably penetrates the upper wall of the furnace body 5 while maintaining airtightness, and extends from the outside to the inside of the furnace body 5 (see FIG. 2). One end of the fan drive shaft 33 is connected to a rotary joint 47 (see later), the other end is connected to a sirocco fan 29, and opens in the furnace body 5.

  The transport means 9 includes a roller conveyor 35 and a conveyor drive source 37 (transport drive source) that drives the roller conveyor 35. The roller conveyor 35 includes a plurality of rollers 39 arranged at predetermined intervals, and a bearing 41 that rotatably supports a conveyor drive shaft 43 (see below) of the conveyor drive source 37. The roller conveyor 35 opens and closes the doors 17, 17, and moves the article 3 to be heated from the outside of the furnace body 5 to the inside of the furnace body 5 and from the inside of the furnace body 5 to the outside. Is arranged to cross. The plurality of rollers 39 are connected by a chain (not shown).

  The conveyor drive source 37 includes a motor for driving the roller conveyor 35. The motor includes a rotor 37a, a stator 37b, bearings 37c and 37c, a housing 37d, and a conveyor drive shaft 43 (conveyance drive shaft). It is equipped with. The conveyor drive source 37 is installed on the furnace side wall of the furnace body 5 via a flange 37e. The conveyor drive shaft 43 is hollow, rotatably penetrates the furnace side wall of the furnace body 5 while maintaining airtightness, and extends from the outside of the furnace body 5 to the inside (see FIG. 2). Further, one end of the conveyor drive shaft 37 is connected to a rotary joint 51 (see later), the other end is connected to a roller 39 a disposed in the furnace body 5, and the leading end thereof opens into the furnace body 5. Yes.

  The intake means 11 is a mechanism for introducing outside air into the furnace body 5 from the outside, and includes a fan drive shaft 33, an outside air introduction pipe 45, and a rotary joint 47, and the outside air introduction pipe is formed by the rotary joint 47. 45 and the hollow fan drive shaft 33 are connected. The rotary joint 47 includes a rotating portion 47a connected to the fan drive shaft 33 and a fixed portion 47b connected to the outside air introduction tube 45, and enables relative rotation between the outside air introduction tube 45 and the fan drive shaft 33 and introduces outside air. The pipe 45 and the flow paths 45a and 33a inside the hollow fan drive shaft 33 are connected to each other while maintaining an airtight state with the outside. The intake means 11 introduces outside air into the furnace body 5 by forming a passage of outside air by the passage 33 a of the hollow fan drive shaft 33, the passage 45 a of the outside air introduction pipe 45 and the rotary joint 47. During the operation of the sirocco fan 29, the suction side at the center of the sirocco fan 29 has a negative pressure, so that outside air is sucked into the furnace body 5 through the flow paths 33a and 45a and circulated into the furnace body 5. The The outside air introduction pipe 45 includes a valve 46, and the amount of outside air introduced into the furnace body 5 can be adjusted by opening and closing the valve 46.

  The exhaust means 13 is a mechanism for exhausting the gas in the furnace body 5 to the outside, and includes a conveyor drive shaft 43, an exhaust pipe 49, and a rotary joint 51. A hollow conveyor drive shaft 43 is connected. The rotary joint 51 includes a rotating portion 51a connected to the conveyor drive shaft 43 and a fixed portion 51b connected to the exhaust pipe 49, and enables relative rotation between the exhaust pipe 49 and the conveyor drive shaft 43. The flow paths 49a and 43a inside the hollow conveyor drive shaft 43 are connected to each other while maintaining an airtight state with the outside. The exhaust means 13 forms a gas path in the furnace body 5 by the flow path 43a of the hollow conveyor drive shaft 43, the flow path 49a of the exhaust pipe 49, and the rotary joint 51, and exhausts the gas to the outside. The exhaust pipe 49 includes a valve 50. By opening and closing the valve 50, the exhaust amount of gas exhausted to the outside can be adjusted.

  The heating means 15 is an electric heater that heats the inside of the furnace body 5, and is installed on the furnace upper wall inside the furnace body 5.

  According to the heating furnace 1 configured as described above, the fan drive shaft 33 and the conveyor drive shaft 43 are hollow, and the furnace wall of the furnace body 5 is rotatably penetrated while maintaining airtightness. By connecting to the outside air introduction pipe 45 and the exhaust pipe 49 via 51, the outside air path (flow paths 33a, 45a) and the gas path (flow paths 37a, 49a) in the furnace body 5 are formed. Thereby, it becomes unnecessary to separately install piping for introducing outside air and piping for exhausting, heat in the furnace body 5 becomes difficult to escape to the outside, and heat insulation of the furnace body 5 can be improved. Moreover, the cost of the heating furnace 1 can be suppressed.

  Moreover, in this embodiment, although the sirocco fan 29 is used as a ventilation fan, you may use other types of ventilation fans, such as a turbo fan.

  Furthermore, in this embodiment, the fan drive shaft 33 and the conveyor drive shaft 43 are directly driven by the motor rotors 31a and 37a, but may be driven via a speed reduction mechanism.

  Moreover, in this embodiment, although the inside of the furnace main body 5 is heated with the electric heater, you may heat with other types of heating means, such as a gas burner.

  DESCRIPTION OF SYMBOLS 1 ... Heating furnace, 3 ... Heated object (workpiece | work), 5 ... Furnace main body, 7 ... Blower means, 9 ... Conveyance means, 11 ... Intake means, 13 ... Exhaust means, 29 ... Sirocco fan (blower fan), 31 ... Fan drive source, 33 ... fan drive shaft, 37 ... conveyor drive source (conveyance drive source), 43 ... conveyor drive shaft (conveyance drive shaft)

Claims (1)

A heating furnace provided with a conveying means for moving a work and a blower fan in the furnace body,
Intake means for introducing outside air into the furnace body;
Exhaust means for exhausting gas in the furnace body;
A fan drive source provided outside the furnace body for driving the blower fan;
A hollow fan drive shaft that passes through the furnace wall of the furnace main body while maintaining airtightness and transmits a driving force between the blower fan and the fan drive source,
A conveyance drive source provided outside the furnace body for driving the conveyance means;
A hollow conveyance drive shaft that penetrates the furnace wall of the furnace main body while maintaining airtightness and transmits a driving force between the conveyance means and the conveyance drive source, and
The intake means introduces outside air into the furnace body through the hollow fan drive shaft,
The heating furnace, wherein the exhaust means exhausts gas to the outside through the hollow conveyance drive shaft.

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