JP3226912U - Industrial furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an industrial furnace capable of uniform degreasing treatment. SOLUTION: The industrial furnace 10 includes a container 12, a heat insulator 16 arranged in an inner space 14 of the container 12, a heater 20 arranged in an inner space 18 formed by the heat insulator 16, and a heat insulator 16. The tight box 24, which is arranged in the internal space 18 and stores the object 22 to be treated, the pump 32, the exhaust pipe 34 connecting the tight box 24 and the pump 32, and the exhaust pipe 34 provided in the middle of the exhaust pipe 34. A trapping device 38 for trapping the emission material generated from the substance 22, a first thermometer 40 for measuring the temperature of the gas in the exhaust pipe 34, and the temperature of the heater 20 is controlled by the temperature measured by the first thermometer 40. And a control device 64. [Selection diagram] Figure 1

Description

The present invention relates to an industrial furnace.

Conventionally, an object to be processed made of a metal or a magnetic material is heat-treated in a vacuum or a pressure environment. For example, Patent Document 1 below includes a vacuum chamber, a heat insulating container in the vacuum chamber, and a heater in the heat insulating container. Place the object to be processed in a heat-insulated container. The inside space of the heat insulating container is heated by the heater to degrease and heat the object to be treated.

International publication number WO2016/158029

If the heat treatment is performed before the object is completely degreased, the heat treatment of the object becomes incomplete. Whether or not it has been degreased is judged by the experience of visual confirmation by the operator of the industrial furnace. The degree of degreasing varies depending on the operator, and the quality of the heat-treated product varies. When the operator leaves the company, it may not be possible to manufacture products of the same quality.

Therefore, an object of the present invention is to provide an industrial furnace capable of uniform degreasing treatment.

In order to solve the above problems, the industrial furnace according to the present invention has a configuration as described below.

The industrial furnace of the present invention comprises a container, a heat insulator arranged in the inner space of the container, a heater arranged in the inner space formed by the heat insulator, a pump, and an exhaust gas connecting the container and the pump. A pipe, a thermometer that measures the temperature of the gas in the exhaust pipe, and a controller that controls the temperature of the heater according to the temperature measured by the thermometer.

Further, a pressure gauge for measuring the pressure of the gas in the exhaust pipe may be provided. Both a thermometer and a pressure gauge may be provided.

The present invention can determine the completion of degreasing by measuring the temperature of the exhaust gas with a thermometer. Also, the completion of degreasing can be determined by measuring the gas pressure. No matter who operates the industrial furnace, degreasing can be done uniformly.

It is a figure which shows the structure of the industrial furnace which measures the temperature of this invention. It is a figure which shows the structure for supplying electric power to a heater. It is a figure which shows the structure of the industrial furnace which measures pressure. It is a figure which shows the structure of the industrial furnace which measures temperature and pressure.

The industrial furnace of the present invention will be described with reference to the drawings. Although a plurality of embodiments will be described, the same reference numerals may be given to the same means even in different embodiments, and description thereof may be omitted.

[Embodiment 1]
The industrial furnace 10 of the present application shown in FIG. 1 accommodates a container 12, a heat insulator 16 arranged in an inner space 14 of the container 12, a heater 20 arranged in an inner space 18 of the heat insulator 16, and an object 22 to be treated. A tight box (inner case) 24, a gas source 26, a supply pipe 30 that connects the gas source 26 to the internal space 14 of the container 12 or the internal space 18 of the heat insulator 16 and the internal space 28 of the tight box 24, a pump 32, A first exhaust pipe 34 connecting the pump 32 and the internal space 28 of the tight box 24; a second exhaust pipe 36 connecting the pump 32 and the internal space 14 of the container 12 or the internal space 18 of the heat insulator 16; A trapping device 38 and a first thermometer 40 for measuring the temperature of the gas flowing through the first exhaust pipe 34 are provided on the way.

The industrial furnace 10 is a furnace for performing sintering, semi-sintering, firing, degreasing, brazing, metallizing, quenching, tempering, tempering, annealing or aging heat treatment.

[container]
The container 12 includes a container body 42 and a container lid 44. The container body 42 has a cylindrical shape. The container lid 44 opens and closes both ends of the container body 42. When both ends of the container body 42 are closed by the container lid 44, the internal space 14 of the container 12 becomes an airtight space. The internal space 14 of the container 12 is depressurized or pressurized. The pressure resistance of the container 12 is, for example, about 10 MPa, and can be changed by various designs. The container 12 has a double structure including an inner wall 46 and an outer wall 48, and a cooling liquid flows between the inner wall 46 and the outer wall 48. When lowering the temperature of the internal space 14, it can be lowered by a cooling liquid.

[Insulator]
The heat insulator 16 is arranged in the internal space 14 of the container 12. The heat insulator 16 includes a heat insulator body 50 and a heat insulator lid 52. The heat insulating body 50 has a tubular shape. The heat insulator cover 52 opens and closes both ends of the heat insulator body 50. An opening/closing device (not shown) for the heat insulating cover 52 is provided so that the heat insulating cover 52 can be opened and closed with the container cover 44 closed. The heat insulator 16 is made of a heat resistant material such as graphite felt or graphite foil.

[heater]
A heater 20 is arranged in the internal space 18 of the heat insulator 16. The heater 20 may be a graphite rod heater. The heater 20 is arranged parallel to the tight box 24. Further, a plurality of heaters 20 are arranged so as to go around the tight box 24. The power supply circuit 54 shown in FIG. 2 supplies power to the heater 20, and the heater 20 generates heat.

[Power supply circuit]
The power supply circuit 54 is a circuit that supplies three-phase AC power to the heater 20. The three terminals for three-phase alternating current are R, S, and T. The power supply circuit 54 includes a wiring 56 connected to each terminal R, S, T, an ammeter 58 for measuring the current flowing through the wiring 56, a switch 60 for selecting the power supply wiring 56, a transformer 62 for converting power, and a switch 60. A control device 64 for on/off control is provided. The switch 60 can use an element such as a thyristor.

The current value measured by the ammeter 58 and the temperature measured by the second thermometer 66 are input to the control device 64. The second thermometer 66 measures the temperature of the internal space 18 of the heat insulator 16. The controller 64 controls on/off of the switch 60 so that the temperature of the internal space 18 of the heat insulator 16 becomes a predetermined temperature. The control device 64 is a circuit such as a program temperature controller or PLC (Programmable Logic Controller). When the switch 60 is turned on, electric power is supplied to the heater 20 via the transformer 62.

[Tight box]
A tight box 24 is arranged in the internal space 18 of the heat insulator 16. The tight box 24 is made of graphite or the like. The tight box 24 includes a tight box body 68 and a tight box lid 70. The tight box body 68 has a tubular shape. The tight box lid 70 opens and closes both ends of the tight box body 68. An opening/closing device (not shown) for the tight box lid 70 is provided so that the tight box lid 70 can be opened and closed. By closing both ends of the tight box body 68 with the tight box lids 70, the internal space 28 of the tight box 24 is sealed.

[Processing object]
The object 22 to be processed is arranged in the internal space 28 of the tight box 24. The material of the object to be processed 22 is a superhard metal, ferrous metal, non-ferrous metal, magnetic material, ceramics, graphite, high-speed steel, die steel or low alloy steel, and the metal includes an alloy. The processing object 22 is a powder or a solid having a predetermined shape. By storing the object 22 to be processed in the tight box 24, it is possible to prevent the emission material released from the object 22 when the object 22 is degreased from being emitted to the outside of the tight box 24. be able to. It is possible to prevent the inner wall 46 of the container 12, the heat insulator 16, the heater 20, and the like from being contaminated.

[Gas source]
The gas source 26 stores and/or produces nitrogen, argon, hydrogen, carbon monoxide, helium, methane, and the like. The gas source 26 and the internal space 14 of the container 12 or the internal space 18 of the heat insulator 16 and the internal space 28 of the tight box 24 are connected by a supply pipe 30. The supply pipe 30 is branched, and valves 72 and 74 are provided in each branch. The flow rate of gas can be controlled by opening and closing the valves 72 and 74. Gas is introduced from the gas source 26 through the supply pipe 30 into the internal space 14 of the container 12, the internal space 18 of the heat insulator 16, and the internal space 28 of the tight box 24. A plurality of gas sources 26 may be provided to supply a plurality of kinds of gases to the internal space 14 of the container 12, the internal space 18 of the heat insulator 16, and the internal space 28 of the tight box 24. Plural supply pipes 30 are provided so that plural kinds of gases are supplied. Since the heat insulator 16 is not completely airtight, the gas can be introduced into one of the inner space 14 of the container 12 or the inner space 18 of the heat insulator 16 and the other gas.

[pump]
The pump 32 evacuates the internal space 14 of the container 12, the internal space 18 of the heat insulator 16, and the internal space 28 of the tight box 24. The pump 32 and the internal space 28 of the tight box 24 are connected by a first exhaust pipe 34. The pump 32 and the internal space 14 of the container 12 or the internal space 18 of the heat insulator 16 are connected by a second exhaust pipe 36. The pump 32 depressurizes the internal space 14 of the container 12, the internal space 18 of the heat insulator 16, and the internal space 28 of the tight box 24. The first exhaust pipe 34 and the second exhaust pipe 36 are provided with valves 76 and 78, respectively, and the exhaust can be controlled by opening and closing the valves 76 and 78. Since the heat insulator 16 is not completely airtight, gas is exhausted from one of the internal space 14 of the container 12 or the internal space 18 of the heat insulator 16, and the other gas is also exhausted.

[Capturing device]
When the object to be processed 22 is degreased, an emission product containing the gaseous binder, particulate dust, or both released from the object to be processed is released. The first exhaust pipe 34 is provided with a trapping device 38 for trapping emissions. The capture device 38 includes a wax tank 80 and a wax filter 82. The wax tank 80 is a device that stores the binder in a liquid state. The wax filter 82 is a device that collects particulate dust. Emissions do not reach pump 32.

[thermometer]
The first thermometer 40 is provided in the first exhaust pipe 34. The first thermometer 40 measures the temperature of the gas flowing through the first exhaust pipe 34. The first thermometer 40 is a thermometer using a thermocouple. The gas containing the emissions is at a higher temperature than the gas not containing it. This is because when the degreasing is completed, the heat contained in the emission is lost. By measuring the temperature of the gas, it can be determined whether or not the gas contains an emission product. The first thermometer 40 measures the temperature of the gas upstream of the trap 38. By measuring the temperature before the capture device 38 captures the emissions, it can be determined whether the gas contains the emissions.

[Control device]
The temperature of the first thermometer 40 is input to the control device 64. If the temperature is higher than the predetermined value, the degreasing process is continued. The controller 64 controls on/off of the switch 60 so as to maintain the temperature of the internal space 18 of the heat insulator 16. If the temperature is lower than the predetermined value, the degreasing process is terminated and the process proceeds to the next process. For example, the on/off of the switch 60 is controlled so as to raise the temperature of the internal space 18 of the heat insulator 16 for the heat treatment process.

[Other]
A fan 84 may be provided in the internal space 14 of the container 12. The fan 84 rotates when the container lid 44 is closed and the heat insulator lid 52 is opened. Gas circulates in the internal space 14 of the container 12 and the internal space 18 of the heat insulator 16. The tight box lid 70 may be opened in some cases. A motor 86 for rotating the fan 84 is attached to the container lid 44.

A guide 88 that connects the heat insulating body 50 to the fan 84 may be provided. A guide 88 determines the direction of the circulating gas. The shape of the guide 88 is not limited as long as the direction of gas is determined. The container 12 has a double structure, and since the cooling liquid flows inside the container 12, the circulating gas is cooled by the cooling liquid. A water-cooled heat exchanger 90 may be arranged between the fan 84 and the heat insulator 16, and the heat exchanger 90 may cool the gas.

[Heat treatment]
Next, heat treatment using the industrial furnace 10 of the present application will be described. Note that the heat treatment to be described is an example, and may be appropriately changed depending on the type of the object to be processed 22 and the processing method.

(1) The target object 22 is housed in the internal space 28 of the tight box 24, and the tight box lid 70, the heat insulating body lid 52, and the container lid 44 are closed.

(2) Exhaust is performed by the pump 32 to control the internal space 14 of the container 12, the internal space 18 of the heat insulator 16 and the internal space 28 of the tight box 24 to a predetermined pressure. Simultaneously with this exhaust, gas is introduced from the gas source 26 into the internal space 14 of the container 12, the internal space 18 of the heat insulator 16 and the internal space 28 of the tight box 24, and these spaces 14, 18, 28 are filled with a predetermined gas. Fulfill.

(3) The control device 64 controls the switch 60 to supply a current to the heater 20 to raise the temperature of the internal space 18 of the heat insulator 16. The tight box 24 arranged in the internal space 18 of the heat insulator 16 is heated, and further, the object to be processed 22 is heated.

The temperature of the object 22 to be processed in the internal space 28 of the tight box 24 rises, and the object 22 to be processed is degreased. At the time of degreasing, the pump 32 is driven, and the discharged matter generated from the object to be treated 22 is stored in the wax tank 80 and the wax filter 82 in the middle of the first exhaust pipe 34. Gas is supplied from the gas source 26 to the internal space 28 of the tight box 24 as needed. The internal space 28 of the tight box 24 is brought to a predetermined pressure by intake and exhaust. In addition to the internal space 28 of the tight box 24, gas may be supplied from the gas source 26 to the internal space 14 of the container 12 and the internal space 18 of the heat insulator 16.

A first thermometer 40 in the middle of the first exhaust pipe 34 measures the temperature of the gas flowing through the first exhaust pipe 34. The temperature measured by the first thermometer 40 is input to the control device 64.

If the input temperature is higher than a predetermined value, the control device 64 controls the switch 60 so that the temperature of the internal space 18 of the heat insulator 16 is maintained. If the temperature of the gas is higher than the predetermined value, the gas contains emissions and degreasing is not complete. The temperature of the internal space 18 of the heat insulator 16 is maintained and degreasing is continued. If the temperature input to the controller 64 does not reach the predetermined value, the switch 60 is turned on/off to change the temperature of the internal space 18 of the heat insulator 16. When the temperature of the gas is lower than the predetermined value, the gas does not contain any emission matter and the degreasing is completed. You can proceed to the next step. For example, the current flowing through the heater 20 is increased to raise the temperature of the object 22 to be processed. For example, the workpiece 22 is sintered at about 1500° C. or higher.

After the degreasing is started, the temperature is input to the control device 64. After the degreasing is started, the temperature may be periodically input to the control device 64, or the temperature may be constantly input to the control device 64. Further, the temperature may be input to the control device 64 after a lapse of a certain time from the start of degreasing.

(4) After the object to be processed 22 is heat-treated, the object to be processed 22 is cooled. The heat insulator lid 52 and the tight box lid 70 are opened. The fan 84 is rotated to circulate the gas and cool the object to be processed 22. When cooling, gas may be introduced from the gas source 26 into the internal space 14 of the container 12, the internal space 18 of the heat insulator 16, and the internal space 28 of the tight box 24.

When the object 22 to be processed is cooled, the container lid 44, the heat insulator lid 52 and the tight box lid 70 are opened, and the object 22 to be treated is taken out.

As described above, by measuring the temperature of the gas exhausted during degreasing, it is possible to determine whether or not degreasing is completed. It is possible to prevent the process from proceeding to the next step when degreasing is not completed.

[Embodiment 2]
The industrial furnace 100 of FIG. 3 includes a pressure gauge 102 on the first exhaust pipe 34 instead of the first thermometer 40 of the first embodiment. The pressure gauge 102 measures the pressure of the gas in the first exhaust pipe 34. The pressure gauge 102 is a diaphragm type pressure gauge. The pressure gauge 102 measures the gas pressure downstream of the trap 38. The gas pressure in the first exhaust pipe 34 is constant no matter where it is measured, and by measuring it downstream of the trap 38, it is possible to prevent the pressure gauge from being contaminated with emissions.

The pressure measured by the pressure gauge 102 is input to the control device 64. The pressure is high if the gas contains emissions, and low if it does not. By measuring the pressure of the gas, it can be determined whether or not the gas contains an emission product. This is because the binder or the like of the object to be processed 22 is vaporized and expanded.

Similar to the first embodiment, the control device 64 controls the switch 60 to be turned on/off according to the input pressure. If the pressure is higher than the predetermined value, the degreasing process is continued. The gas contains emissions and degreasing is not complete. The controller 64 controls on/off of the switch 60 so as to maintain the temperature of the internal space 18 of the heat insulator 16. Degreasing is continued. If the pressure is lower than the predetermined value, the degreasing process is terminated and the process proceeds to the next process. The gas contains no emissions and degreasing is complete. For example, the switch 60 is on/off controlled so as to raise the temperature of the internal space 18 of the heat insulator 16 for the heat treatment step.

After the degreasing is started, the pressure is input to the control device 64. After starting degreasing, the pressure may be periodically input to the control device 64, or the pressure may be constantly input to the control device 64. Further, the pressure may be input to the control device 64 after a lapse of a certain time from the start of degreasing.

By measuring the pressure, the completion of degreasing can be determined. It is possible to prevent the process from proceeding to the next step when degreasing is not completed.

[Embodiment 3]
The industrial furnace 110 of FIG. 4 includes a first thermometer 40 and a pressure gauge 102 in the first exhaust pipe 34. The first thermometer 40 measures the temperature of the gas upstream of the trap 38, and the pressure gauge 102 measures the pressure of the gas downstream of the trap 38. That is, the first and second embodiments are combined.

The temperature measured by the first thermometer 40 and the pressure measured by the pressure gauge 102 are input to the control device 64. The controller 64 controls ON/OFF of the switch 60 so that the temperature of the internal space 18 of the heat insulator 16 is maintained when the temperature is equal to or higher than a predetermined value and the pressure is equal to or higher than the predetermined value. Since the gas contains emissions, continue the degreasing process. The switch 60 is on/off controlled so that the temperature of the internal space 18 of the heat insulator 16 changes when the temperature is lower than a predetermined value and the pressure is lower than the predetermined value. For example, the switch 60 is on/off controlled so that the temperature of the heater 20 rises due to the heating process.

After degreasing is started, the temperature and pressure are input to the control device 64. After the degreasing is started, the temperature and the pressure may be input to the control device 64 at regular intervals, or the temperature and the pressure may be input to the control device 64 at all times. Further, the temperature and pressure may be input to the control device 64 after a lapse of a certain time from the start of degreasing.

Completion of degreasing can be determined by measuring temperature and pressure. It is possible to prevent the process from proceeding to the next step when degreasing is not completed.

(Claim 1) An industrial furnace according to one aspect, a container, a heat insulator arranged in an inner space of the container, a heater arranged in an inner space formed by the heat insulator, a pump, and the container. An exhaust pipe that connects the pump and a pump; a thermometer that measures the temperature of the gas in the exhaust pipe; and a controller that controls the temperature of the heater based on the temperature measured by the thermometer.

According to the industrial furnace described in the first paragraph, the progress of degreasing can be determined by measuring the temperature of the exhaust gas with the thermometer. No matter who operates the industrial furnace, the completion of degreasing can be judged at the same timing.

(Section 2) The thermometer measures the temperature of the gas inside the exhaust pipe.

According to the industrial furnace described in the second paragraph, it is possible to determine whether or not the gas contains the emission by measuring the temperature of the gas before the emission is captured by the capturing device.

(Section 3) If the temperature measured by the thermometer is higher than a predetermined value, the control device controls the heater so as to maintain the temperature of the internal space of the heat insulator.

According to the industrial furnace described in the paragraph 3, if the temperature of the gas is higher than a predetermined value, the gas contains an emission substance, and the degreasing is continuously performed, and the transition to the next step is waited.

(Claim 4) An industrial furnace according to one aspect, a container, a heat insulator arranged in an inner space of the container, a heater arranged in an inner space formed by the heat insulator, a pump, and the container. An exhaust pipe connecting the pump with a pump; a pressure gauge for measuring the gas pressure in the exhaust pipe; and a controller for controlling the temperature of the heater by the pressure measured by the pressure gauge.

According to the industrial furnace described in the fourth item, the progress of degreasing can be determined by measuring the pressure of the exhaust gas with the pressure gauge. No matter who operates the industrial furnace, the completion of degreasing can be judged at the same timing.

(Section 5) The pressure gauge measures the pressure of the gas inside the exhaust pipe.

According to the industrial furnace described in paragraph 5, the gas pressure in the exhaust pipe is the same no matter where it is measured, and by measuring the gas pressure downstream of the trap, the pressure gauge is contaminated with emissions. Can be prevented.

(Sixth item) The controller controls the heater so as to maintain the temperature of the internal space of the heat insulator when the pressure measured by the pressure gauge is higher than a predetermined value.

According to the industrial furnace described in the sixth item, if the gas pressure is higher than a predetermined value, the gas contains an emission substance, and the degreasing is continuously performed and the transition to the next step is waited.

(Claim 7) An industrial furnace according to one aspect, a container, a heat insulator arranged in an inner space of the container, a heater arranged in an inner space formed by the heat insulator, a pump, and the container. And an exhaust pipe that connects the pump, a trapping device that is provided in the middle of the exhaust pipe and that traps emissions generated from the object to be processed, a thermometer that measures the temperature of the gas in the exhaust pipe, and the exhaust pipe And a controller for controlling the temperature of the heater according to the temperature measured by the thermometer and the pressure measured by the pressure gauge.

According to the industrial furnace described in Item 7, the progress of degreasing can be determined by measuring the temperature of the gas exhausted by the thermometer and the pressure of the gas exhausted by the pressure gauge. No matter who operates the industrial furnace, the completion of degreasing can be judged at the same timing.

(Section 8) The thermometer measures the temperature of the gas inside the exhaust pipe, and the pressure gauge measures the pressure of the gas inside the exhaust pipe.

According to the industrial furnace of Item 8, by measuring the temperature of the gas before the trap is captured by the trap, it is possible to determine whether or not the gas contains the trap. Further, the gas pressure in the exhaust pipe is the same no matter where it is measured, and by measuring the gas pressure downstream of the trap device, it is possible to prevent the pressure gauge from being contaminated with emissions.

(Clause 9) If the temperature measured by the thermometer by the control device is higher than a predetermined value, the pressure measured by the pressure gauge is higher than a predetermined value, or both, the temperature of the internal space of the heat insulator Control the heater to maintain

According to the industrial furnace of Item 9, if the gas temperature is higher than a predetermined value, the gas pressure is higher than a predetermined value, or both are high, the gas contains an emission substance, and degreasing is performed. Continue the process and wait for the transition to the next process.

In addition, the present invention can be implemented in a mode in which various improvements, modifications and changes are made based on the knowledge of those skilled in the art without departing from the spirit of the invention. The respective embodiments described are not independent, but can be appropriately combined and implemented based on the knowledge of those skilled in the art.

10, 100, 110: Industrial furnace 12: Container 14: Container inner space 16: Heat insulator 18: Heat insulator inner space 20: Heater 22: Object 24: Tight box 26: Gas source 28: Tight box inside Space 30: Supply pipe 32: Pumps 34, 36: Exhaust pipe 38: Capture device 40: Thermometer 64: Control device 102: Pressure gauge

Claims (9)

Container and
A heat insulator disposed in the internal space of the container,
A heater arranged in the internal space formed by the heat insulator,
A pump,
An exhaust pipe connecting the container and the pump,
A thermometer for measuring the temperature of the gas in the exhaust pipe,
A control device for controlling the temperature of the heater by the temperature measured by the thermometer,
Industrial furnace equipped with. The industrial furnace according to claim 1, wherein the thermometer measures the temperature of the gas inside the exhaust pipe. The industrial furnace according to claim 1 or 2, wherein the controller controls the heater so that the temperature of the internal space of the heat insulator is maintained if the temperature measured by the thermometer is higher than a predetermined value. Container and
A heat insulator disposed in the internal space of the container,
A heater arranged in the internal space formed by the heat insulator,
A pump,
An exhaust pipe connecting the container and the pump,
A pressure gauge for measuring the pressure of the gas in the exhaust pipe,
A control device for controlling the temperature of the heater by the pressure measured by the pressure gauge,
Industrial furnace equipped with. The industrial furnace according to claim 4, wherein the pressure gauge measures the pressure of the gas inside the exhaust pipe. The industrial furnace according to claim 4 or 5, wherein the control device controls the heater so that the temperature of the internal space of the heat insulator is maintained if the pressure measured by the pressure gauge is higher than a predetermined value. Container and
A heat insulator disposed in the internal space of the container,
A heater arranged in the internal space formed by the heat insulator,
A pump,
An exhaust pipe connecting the container and the pump,
A trapping device that is provided in the middle of the exhaust pipe and that traps emissions generated from the object to be treated,
A thermometer for measuring the temperature of the gas in the exhaust pipe,
A pressure gauge for measuring the pressure of the gas in the exhaust pipe,
A controller for controlling the temperature of the heater by the temperature measured by the thermometer and the pressure measured by the pressure gauge,
Industrial furnace equipped with. The industrial furnace according to claim 7, wherein the thermometer measures the temperature of the gas inside the exhaust pipe, and the pressure gauge measures the pressure of the gas inside the exhaust pipe. If the control device has a temperature measured by a thermometer higher than a predetermined value, a pressure measured by a pressure gauge is higher than a predetermined value, or both, the temperature of the internal space of the heat insulator is maintained. The industrial furnace according to claim 7 or 8, which controls a heater.

Images