JPH09210575A - Work heat treatment system - Google Patents

Abstract

(57) [Summary] [Purpose] To efficiently use energy and reduce the heat treatment time of the work. A heat treatment furnace 10 for discharging exhaust gas containing smoke at a temperature higher than that of air supplied from an air supply port 110 from an exhaust port 120.
0 and the smoke contained in the exhaust gas sucked from the smoke suction port 220 are removed, and the exhaust gas from which the smoke is removed is discharged to the exhaust port 210.
Smoke extinguishing machine 200, exhaust port 120 and smoke suction port 2
A heat treatment system for a work having an exhaust passage 300 connecting 20 and a circulation passage 400 connecting the discharge port 210 and the air supply port 110, wherein the smoke eliminator 2 is used during heat treatment of the work.
The exhaust gas from which smoke has been removed is supplied as the supply air at 00, and new supply air is supplied when the heat treatment of the work is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work heat treatment system capable of efficiently utilizing energy and shortening a heat treatment time of a work.

[0002]

2. Description of the Related Art A conventional work heat treatment system will be described with reference to FIG. First, a heat treatment furnace 10 such as a temper furnace
At 0, the supply air is supplied from the supply port 110, and high-temperature (about 160 ° C.) exhaust gas containing smoke generated by the heat treatment is exhausted from the exhaust port 120. Since it is not preferable from the environmental point of view to discharge this exhaust gas as it is, the exhaust gas is discharged through the exhaust passage 30.
0 to the smoke eliminator 200. This smoke remover 200
Has an electrode provided therein, and removes smoke from the exhaust gas by adsorbing smoke particles contained in the exhaust gas by an electric field generated by discharge between the electrodes. The exhaust gas from which smoke has been removed is the exhaust port 21 of the smoke eliminator 200.
It is discharged from 0 to the outside. Outlet 2 of this smoke remover 200
The exhaust gas discharged from 10 is still high temperature of about 100 ° C.

The heat treatment of the work in the heat treatment furnace 100 includes the steps of loading the work into the furnace of the heat treatment furnace 100,
Conducting a heat treatment by energizing a heat source of the heat treatment furnace 100;
It is roughly divided into a step of carrying out the work piece after the heat treatment from the inside of the heat treatment furnace 100. Further, the heat treatment step includes a step of raising the temperature inside the heat treatment furnace 100 to a predetermined temperature, a step of maintaining the temperature inside the furnace at a predetermined temperature, and a step of decreasing the temperature inside the furnace to a predetermined temperature. Can be divided into Here, the time required for one heat treatment is largely influenced by the heat treatment step, and further, the step of lowering the temperature inside the heat treatment furnace 100.

[0004]

By the way, in the heat treatment, since the temperature of the supply air accompanying the exhaust is room temperature, energy for heating in the furnace of the heat treatment furnace is required.
The energy for raising the temperature of the supply air is not directly used for the heat treatment of the work, so that the energy efficiency is not good. In addition, when a work piece that has undergone one heat treatment is unloaded from the heat treatment furnace, the temperature inside the heat treatment furnace is lowered by natural cooling, so it takes time to perform heat treatment on the next new work piece, and the efficiency is improved. It wasn't good.

The present invention was devised in view of the above circumstances, and an object thereof is to provide a work heat treatment system capable of efficiently utilizing energy. Another object is to provide a work heat treatment system that can shorten the heat treatment time of the work.

[0006]

According to a first aspect of the present invention, there is provided a heat treatment system for a workpiece, wherein a heat treatment furnace discharges exhaust gas containing smoke at a temperature higher than that of the air supplied from an air supply port, and a smoke intake port. While removing the smoke contained in the exhaust,
A smoke extinguisher that discharges the exhaust from which smoke has been removed from an exhaust port, an exhaust path that connects the exhaust port and the smoke intake port, and a circulation path that connects the exhaust port and the air supply port, Exhaust gas from which smoke has been removed by a smoke eliminator is supplied to the heat treatment furnace as supply air.

Further, the work heat treatment system according to claim 2 is included in a heat treatment furnace for discharging exhaust gas containing smoke at a temperature higher than the supply air supplied from the air supply port from the exhaust port, and exhaust gas sucked from the smoke intake port. A smoke eliminator that removes smoke and exhausts the exhaust from which the smoke has been removed from an exhaust port, an exhaust path that connects the exhaust port and the smoke intake port, and a circulation path that connects the exhaust port and the air supply port A heat treatment system for a workpiece, wherein exhaust gas from which smoke has been removed by a smoke eliminator is supplied as air supply during heat treatment of the work, and new air supply is supplied when heat treatment of the work is completed. Is configured.

Further, the work heat treatment system according to claim 3 is included in a heat treatment furnace for discharging exhaust gas containing smoke at a temperature higher than the supply air supplied from the air supply port from the exhaust port, and an exhaust gas sucked from the smoke intake port. A smoke eliminator that removes smoke and exhausts the exhaust from which the smoke has been removed from an exhaust port, an exhaust path that connects the exhaust port and the smoke intake port, and a circulation path that connects the exhaust port and the air supply port In the work heat treatment system, the exhaust gas from which smoke is removed by the smoke eliminator is supplied as air supply during heat treatment of the work and new air supply is supplied when the heat treatment of the work is completed. The circulation path includes a first path for discharging exhaust gas to the outside as it is, a second path for guiding the exhaust gas to the air supply port of the heat treatment furnace, and a third path for supplying new air supply. Is provided, and a first valve is provided in the first path. Is provided with a second valve and a third valve is provided with a third valve. During the heat treatment, the first valve and the third valve are closed and the second valve is opened. When the heat treatment is completed, the first valve and the third valve are opened and the second valve is opened.
Is configured to be closed.

Further, in the work heat treatment system according to the fourth aspect, the first valve, the second valve and the third valve are interlocked, and the first valve and the third valve are always in the same state. Then, the second valve is configured so as to be in an opposite state to the first valve and the third valve.

[0010]

FIG. 1 is a schematic configuration diagram of a work heat treatment system according to a first embodiment of the present invention, and FIG. 2 is a schematic work heat treatment system according to a second embodiment of the present invention. It is a block diagram. In addition, substantially the same members and the like as conventional ones will be described with the same reference numerals.

As shown in FIG. 1, the work heat treatment system according to the first embodiment of the present invention exhausts exhaust gas 120 containing smoke at a temperature higher than that of the air supplied from the air supply port 110.
From the heat treatment furnace 100 that is exhausted from the smoke removal device 200 that removes smoke contained in the exhaust gas that has been sucked in through the smoke intake port 220 and that exhausts the exhaust gas from which the smoke has been removed through the exhaust port 210.
And a circulation path 400 connecting the exhaust port 210 and the air supply port 110. The heat treatment furnace 100 includes the smoke eliminator 200. The exhaust path 300 connects the exhaust port 120 and the smoke intake port 220. The smoke-exhausted exhaust gas is supplied as the supply air.

The heat treatment furnace 100 is for subjecting a work carried into the furnace to some heat treatment and corresponds to, for example, a tempering furnace or a heating furnace. Such heat treatment furnace 100
A heat source such as a heater is embedded in the surrounding furnace wall forming the furnace, or a heat source such as a heater is installed in the furnace. The heat treatment furnace 100 is provided with an exhaust port 120 for discharging exhaust gas containing smoke to the outside because smoke is generated due to heat treatment in the furnace. Further, an air supply port 110 for introducing the air supply into the furnace as the exhaust gas is discharged from the exhaust port 120 is provided.

The smoke eliminator 200 is the same as that described in the section of the prior art, has electrodes inside, and the smoke contained in the exhaust gas due to the electric field generated by the discharge between the electrodes. The smoke contained in the exhaust gas is removed by adsorbing the fine particles. Exhaust gas including smoke is sucked from the smoke suction port 220 to remove smoke in the exhaust gas. The exhaust from which the smoke is removed is exhausted from the exhaust port 210.

Between the heat treatment furnace 100 and the smoke eliminator 200, that is, the exhaust port 120 of the heat treatment furnace 100 and the smoke eliminator 2
The exhaust passage 300 formed of a pipe is provided between the smoke suction port 220 and the smoke suction port 220. That is, this exhaust path 300
Guides the exhaust containing smoke emitted from the heat treatment furnace 100 to the smoke eliminator 200.

Between the smoke eliminator 200 and the heat treatment furnace 100, that is, the discharge port 210 of the smoke eliminator 200 and the heat treatment furnace 1
A circulation path 400 made of a pipe is provided between the air supply port 110 and the air supply port 110. The air supply passage 400 guides the exhaust from which the smoke exhausted from the smoke eliminator 200 is removed to the heat treatment furnace 100 as the air supply.

The heat treatment of the work by the work heat treatment system according to the first embodiment configured as described above will be described. First, the work is carried into the furnace of the heat treatment furnace 100, and the work is heat-treated. Then, the exhaust gas containing smoke generated by the heat treatment is discharged from the exhaust port 120 and sucked into the smoke eliminator 200 via the exhaust passage 300. Since the temperature of the exhaust gas is heated in the furnace of the heat treatment furnace 100, the temperature of the exhaust gas is higher than that when air is supplied. The smoke eliminator 200 removes smoke contained in the exhaust gas and discharges the smoke from the discharge port 210. The temperature of the exhaust gas discharged from the discharge port 210 is lower than that when discharged from the discharge port 120.
It's still hotter than when it was supplied. This exhaust gas is guided to the air supply port 110 of the heat treatment furnace 100 via the circulation path 400 and supplied to the heat treatment furnace 100 as air supply.

That is, the exhaust gas discharged from the heat treatment furnace 100 even once, and supplied again to the heat treatment furnace 100 through the smoke eliminator 200 as the supply air is the temperature of the supply air when the heat treatment is started (temperature in the furnace). Since the temperature is higher than that, the rate of lowering the temperature inside the heat treatment furnace 100 is low.
In other words, the energy required to keep the temperature inside the heat treatment furnace 100 constant is less than that required in the conventional case where new air supply (room temperature) is constantly supplied. Further, if the energy supplied to the heat source of the heat treatment furnace 100 is the same as the conventional one, the temperature inside the furnace can be further raised. This is an efficient use of energy.

Next, a work heat treatment system according to a second embodiment of the present invention will be described with reference to FIG. The work heat treatment system according to the second embodiment of the present invention is
The heat treatment furnace 100 that discharges exhaust gas containing smoke at a temperature higher than that of the supply air supplied from the air supply port 110 from the exhaust port 120, and the smoke contained in the exhaust gas sucked from the smoke intake port 220 are removed and the smoke is removed. It has a smoke eliminator 200 that discharges exhaust gas from an exhaust port 210, an exhaust path 300 that connects the exhaust port 120 and the smoke intake port 220, and a circulation path 400 that connects the exhaust port 210 and the air supply port 110. A work heat treatment system, wherein the smoke eliminator 20 is used during heat treatment of the work.
The exhaust gas from which smoke has been removed at 0 is supplied as the supply air, and when the heat treatment of the work is completed, new supply air is supplied.

The heat treatment furnace 100 and the smoke eliminator 200 are
Since it is the same as that used in the work heat treatment system according to the first embodiment, detailed description thereof will be omitted.

The work heat treatment system according to the second embodiment differs from the work heat treatment system according to the first embodiment in the circulation path 400. Circulation path 400 of the work heat treatment system according to the second embodiment
Are roughly divided into a first route 410, a second route 420, and a third route 430.

The first passage 410 is for exhausting exhaust gas from the exhaust port 210 of the smoke eliminator 200, that is, exhaust gas from which smoke has been removed, to the outside as it is.
00 is provided.

Further, the second path 420 is connected to the first path.
Communicating with the path 410 of (1) and branching from the first valve further upstream. That is, the second path 42
0 connects the exhaust port 210 of the smoke eliminator 200 and the air supply port 110 of the heat treatment furnace 100. A second valve 600 is provided on the second path 420.

Further, the third path 430 communicates with the second path 420 on the downstream side of the second 600. A pump 800 that supplies atmospheric air to the circulation path 400 as an air supply is connected to the third path 430, and a third valve is provided at a position between the connection portion for the second path 420 and the pump. 700 is provided.

The above-mentioned first valve 500, second valve 600 and third valve 700 are interlocked. That is, the three valves 500, 600 and 700 are adapted to simultaneously perform the opening / closing operation. Moreover, the first valve 500 and the third valve 700 are always in the same state, and the second valve 600 is the first valve 5
00 and the third valve 700 are in the opposite states. Specifically, when the first valve 500 and the third valve 700 are in the open state, the second valve 500
Valve 600 of the first valve 50 is closed.
When 0 and the third valve 700 are in the closed state, the second valve 600 is in the open state.

The heat treatment of the work by the work heat treatment system according to the second embodiment having such a configuration will be described. First, the work is carried into the furnace of the heat treatment furnace 100, and the work is heat-treated. During the heat treatment of the work, the first valve 500 and the third valve 700 are closed and the second valve 600 is opened. Exhaust gas containing smoke generated by the heat treatment is discharged from the exhaust port 120 and sucked into the smoke eliminator 200 via the exhaust passage 300. Since the temperature of the exhaust gas is heated in the furnace of the heat treatment furnace 100,
It is hotter than when it was supplied. The smoke eliminator 200 removes smoke contained in the exhaust gas and discharges the smoke from the discharge port 210. The temperature of the exhaust gas discharged from the discharge port 210 is lower than that when discharged from the discharge port 120.
It's still hotter than when it was supplied. This exhaust gas is guided to the air supply port 110 of the heat treatment furnace 100 via the circulation path 400 and supplied to the heat treatment furnace 100 as air supply. That is, it is supplied to the heat treatment furnace 100 as the air supply through the second path 420 of the circulation path 400.

In this way, during the heat treatment, as in the work heat treatment system according to the first embodiment, the heat is discharged from the heat treatment furnace 100 even once, and the air is supplied to the heat treatment furnace 100 again through the smoke eliminator 200. Since the supplied exhaust gas is at a higher temperature than when the heat treatment was started, the heat treatment furnace 1
The rate of decreasing the temperature in the furnace of 00 is low. In other words, the energy required to maintain the temperature inside the heat treatment furnace 100 at a constant level is lower than that required in the conventional case in which fresh air is constantly supplied. Further, if the energy supplied to the heat source of the heat treatment furnace 100 is the same as the conventional one, the temperature inside the furnace can be further increased. This is an efficient use of energy.

On the other hand, when the heat treatment of the work is completed,
The work is unloaded from the furnace of the heat treatment furnace 100. Prior to this unloading, the first valve 500 and the third valve 700
And the second valve 600 is closed. At the same time, the pump 800 is operated. Then, the heat treatment furnace 100 is supplied with the room temperature atmosphere as the supply air from the pump 800. As a result, the temperature inside the heat treatment furnace 100 rapidly drops. In addition, the first valve 500 opens and the second valve 6
Since 00 is closed, the smoke-containing exhaust gas from the heat treatment furnace 100 has its smoke removed by the smoke remover 200 and is exhausted to the outside through the first valve 500 and the first path 410.

When the temperature inside the heat treatment furnace 100 is lowered to a predetermined temperature, the work after the heat treatment is carried out, a new work is carried into the furnace, and the next heat treatment is performed.

As described above, since the temperature inside the heat treatment furnace 100 is rapidly lowered in the process prior to the unloading of the work, the time required for lowering the temperature inside the furnace is lower than that in the conventional natural cooling. Can be shortened.

The supply of new supply air to the heat treatment furnace 100 is not limited to the pump 800. For example, an air cylinder filled with compressed air may be used, or a cylinder filled with compressed non-oxidizing gas or reducing gas may be used depending on the material of the workpiece to be heat treated.

[0031]

As described above, in the work heat treatment system according to the first aspect, the heat treatment furnace for discharging exhaust gas containing smoke from the exhaust port at a temperature higher than that of the supply air supplied from the supply port, and the suction port for sucking the exhaust gas. A smoke extinguisher that removes smoke contained in the exhaust gas and discharges the exhaust gas from which the smoke has been removed from the exhaust port, an exhaust path connecting the exhaust port and the smoke intake port, the exhaust port and the air supply port The heat treatment furnace is configured to be supplied with the exhaust gas from which smoke has been removed by the smoke eliminator, so that energy can be efficiently used.

That is, since the exhaust gas discharged from the heat treatment furnace even once, and supplied to the heat treatment furnace through the smoke eliminator again as the supply air has a higher temperature than when the heat treatment was started,
The rate of lowering the temperature inside the heat treatment furnace is low.
In other words, the energy required to maintain a constant temperature in the furnace of the heat treatment furnace is less than in the conventional one in which fresh air is always supplied. Further, if the energy supplied to the heat source of the heat treatment furnace is the same as the conventional one, the temperature inside the furnace can be further increased. This is an efficient use of energy.

According to the work heat treatment system of the second and third aspects, in addition to the effect of the work heat treatment system of the first aspect, there is an effect that the time required for the heat treatment can be shortened.

That is, in the work heat treatment system according to the second and third aspects, during the heat treatment of the work, the exhaust gas from which smoke has been removed by the smoke eliminator is supplied as the air supply, and when the heat treatment of the work is completed, the new heat treatment system is newly provided. Since the supply air is supplied, it is possible to rapidly reduce the temperature in the furnace of the heat treatment furnace, which is necessary for exchanging the heat-treated work with a new work, by using the new supply air. Therefore, when the heat treatment is repeated, the time required for the heat treatment as a whole can be shortened.

Further, in the workpiece heat treatment system according to claim 4, the first valve, the second valve and the third valve in the workpiece heat treatment system according to claim 3 are interlocked, and the first valve and the third valve are linked. Since the second valve is always in the same state as the third valve and the second valve is in the opposite state to the first valve and the third valve, there is an effect that there is no malfunction of each valve. ing.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a work heat treatment system according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a work heat treatment system according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional work heat treatment system of this type.

[Explanation of symbols]

 100 heat treatment furnace 110 air supply port 120 exhaust port 200 smoke eliminator 210 exhaust port 220 smoke absorption port 300 exhaust path 400 circulation path 410 first path 420 second path 430 third path 500 first valve 600 second Valve 700 Third valve

Claims (4)

[Claims] 1. A heat treatment furnace for discharging exhaust gas containing smoke at a temperature higher than that of the supply air supplied from the air supply port from the exhaust port, and removing the smoke contained in the exhaust gas sucked from the smoke intake port and removing the smoke. A heat treatment furnace comprising a smoke eliminator for discharging exhaust gas from an exhaust port, an exhaust path connecting the exhaust port and the smoke intake port, and a circulation path connecting the exhaust port and the air supply port. Is a work heat treatment system in which the exhaust gas from which smoke has been removed by a smoke eliminator is supplied as supply air. 2. A heat treatment furnace for discharging exhaust gas containing smoke at a temperature higher than that of the supply air supplied from the supply port from the exhaust port, and removing smoke contained in the exhaust gas sucked from the smoke intake port and removing the smoke. In a work heat treatment system having a smoke eliminator for discharging exhaust gas from an exhaust port, an exhaust path connecting the exhaust port and the smoke intake port, and a circulation path connecting the exhaust port and the air supply port, A work heat treatment system characterized in that exhaust gas from which smoke has been removed by a smoke eliminator is supplied as air supply during heat treatment, and new air supply is supplied when heat treatment of the work is completed. 3. A heat treatment furnace for discharging exhaust gas containing smoke at a temperature higher than that of the supply air supplied from the air supply port from the exhaust port, and removing smoke contained in the exhaust gas sucked from the smoke intake port and removing the smoke. The heat treatment of the work piece having a smoke eliminator for discharging the exhaust gas from the exhaust port, an exhaust path for connecting the exhaust port and the smoke suction port, and a circulation path for connecting the exhaust port and the air supply port. In the work heat treatment system, the exhaust gas from which smoke has been removed by the smoke eliminator is supplied as the supply air, and new heat supply air is supplied when the heat treatment of the work is completed. A first path for exhausting the exhaust gas to the heat treatment furnace, a second path for guiding the exhaust gas to the air supply port of the heat treatment furnace, and a third path for supplying new air supply. Has a first valve, a second valve with a second path and a third valve with a third path. 3 valves are provided respectively, and during heat treatment, the first valve and the third valve are closed and the second valve is opened, and when the heat treatment is completed, the first valve and the third valve are opened. A workpiece heat treatment system characterized in that the valve and the second valve are closed while the valve is opened. 4. The first valve, the second valve and the third valve are interlocked, the first valve and the third valve are always in the same state, and the second valve is the first valve. The workpiece heat treatment system according to claim 3, wherein the valve and the third valve are in an opposite state.