JP2000329474A - Batch oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a batch oven that can save power and can rapidly decrease temperature by equipping a switching damper for controlling the switching of a bypass passing through a watercooling type fin cooler and that of a partial route to be bypassed. SOLUTION: A part that is lower than a partition 13 in an oven body 1 accommodates an object 3 to be heated, and is a heating chamber H for heating the object 3. On the other hand, a heater 2, a fan 4, a watercooling type fin cooler 5, a switching damper 6, and the like are provided at a part above the partition 13. While the switching damper 6 is closed, a cooling chamber 11 is closed by a cover 10 and the switching damper 6. Gas can be circulated through a route 12 and cannot be circulated while the switching damper 6 is fully open to the side of the route 12. More specifically, the watercooling type fin cooler 5 is arranged while the route 12 is bypassed. Also, the switching damper 6 controls the switching of a bypass passing through the watercooling type fin cooler 5 and that of the route 12 to be bypassed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch oven for heat-treating an object in a specific atmosphere gas or clean air.

[0002]

2. Description of the Related Art In a batch oven, after heat treatment of an object to be heat-treated, a gas such as an atmospheric gas is trapped in a furnace.
Cooling in a short time is often required. In that case, conventionally, a water-cooled fin cooler was installed on the gas circulation path in the furnace. The hot air after the heat treatment is rapidly cooled by the water-cooled fin cooler. The water-cooled fin cooler is supplied with water not only during cooling but also during heating. This is because if the flow of water is stopped during the heat treatment, the remaining water in the fin cooler will boil, and if the water is re-flowed there, the fin cooler will be damaged by the air hammer phenomenon.

[0003]

In the above-described conventional batch oven, since the water is cooled by the water-cooled fin cooler even during the heat treatment, a heat loss is caused correspondingly.
Therefore, a large-capacity heater must be adopted in consideration of this, and power consumption increases. However, unless a water-cooled fin cooler is provided, it takes a long time to lower the temperature, and the efficiency is not good.

[0004] In view of the above-mentioned conventional problems, an object of the present invention is to provide a batch oven that can save power and can rapidly lower the temperature.

[0005]

According to the present invention, there is provided a batch oven comprising: a furnace body which can be sealed; a hot air circulation path provided inside the furnace body; a heater provided in the hot air circulation path; A heating chamber provided in the hot air circulation path and containing the object to be heat-treated, a fan provided in the hot air circulation path and circulating gas between the heater and the object to be heat-treated, and inside the furnace body. A water-cooled fin cooler that is provided and bypasses a part of the passage on the hot air circulation path, controls opening and closing of a bypass passing through the water-cooled fin cooler, and controls opening and closing of a part of the bypassed passage And a changeover damper. In the batch oven configured as described above, when heating the object to be heat-treated, the switching damper closes the bypass passing through the water-cooled fin cooler and simultaneously opens the bypassed passage. Thereby, the gas in the furnace circulates without passing through the water-cooled fin cooler. On the other hand, when cooling the object to be heat-treated, by opening the bypass passing through the water-cooled fin cooler and closing the passage on the bypass side, heat exchange can be performed and the circulating gas can be quickly cooled. At this time, the temperature of the gas drops to near the water supply temperature of the water-cooled fin cooler. Further, if the degree of opening and closing (opening degree) is adjusted, it is also possible to adjust the temperature drop rate.

[0006]

1 and 2 are vertical sectional views of a batch oven according to an embodiment of the present invention. 1 shows a state during the heat treatment, and FIG. 2 shows a state during the cooling. First, in FIG. 1, the furnace body 1 includes a main body 1a.
And a door 1b, each of which is filled with a heat insulating material. A seal member 1c is provided on the entire periphery of the gap between the main body 1a and the door 1b.
By closing, the furnace body 1 can be hermetically closed.
The loading of the heat treatment target 3 is performed by opening the door 1b. A gantry 7 is installed on the bottom surface of the furnace body 1,
Is placed. An air filter 8 is provided on the right side of the object 3 to be heat-treated. The inside of the furnace body 1 is vertically divided by a partition 13, and upper and lower spaces communicate with each other at left and right ends of the partition 13. Thereby, a gas circulation path can be formed in the furnace body 1. Below the partition 13 in the furnace body 1, the heat treatment target 3 is stored, and
This is a heating chamber H for heating this.

On the other hand, above the partition 13, the heater 2,
Fan 4, water-cooled fin cooler 5, and switching damper 6
Etc. are provided. The heater 2 has a plurality of rod-shaped heating elements inserted into a furnace. The fan 4 is
Driven by a motor 9 provided on the furnace body 1,
The gas in the furnace is circulated in one direction. The water-cooled fin cooler 5 is surrounded by a cover 10, and when the switching damper 6 is closed as shown in the drawing, the cooling chamber 11 is closed by the cover 10 and the switching damper 6. In this state, gas can flow through the passage 12, and conversely, the switching damper 6
When gas is completely opened to the side of the passage 12, gas does not flow. That is, the water-cooled fin cooler 5 is
It is arranged bypassing. Switching damper 6
Is the opening and closing of the bypass passing through the water-cooled fin cooler 5,
The opening and closing of the bypass 12 is controlled.

During the heating and soaking operation, the heater 2 is energized and the fan 4 is rotated in the state shown in FIG. Thus, the air filter 8, the heating chamber H (the object to be heat-treated 3), the heater 2,
A hot air circulation path A1 returning to the fan 4 via the passage 12 is formed. Therefore, the gas heated by the heater 2 is sent out by the fan 4 through the passage 12, passes through the air filter 8, and is blown to the heat treatment target 3 after being dust-removed. Thus, the heat treatment of the heat treatment target 3 is performed. During this heat treatment, the gas does not touch the water-cooled fin cooler 5, so there is no heat loss. Therefore, the capacity of the heater 2 is required to be a minimum and power saving can be realized.

Next, in order to perform cooling after the heat treatment, the power supply to the heater 2 is stopped, and the switching damper 6 is opened as shown in FIG. Thereby, the cooling chamber 11 opens, and at the same time,
The passage 12 is closed. Therefore, the gas circulation path A2
Is as shown in the figure. Therefore, the gas comes into contact with the water-cooled fin cooler 5, and the temperature is quickly lowered by heat exchange.
At this time, the temperature of the gas drops until it becomes close to the temperature of water supplied to the water-cooled fin cooler 5, so that the temperature at which the gas is cooled can be set according to the temperature of water supplied. That is, the temperature of the gas can be controlled by changing the supply water temperature. After cooling, when the next heat treatment target 3 is heated, the switching damper 6 causes the water-cooled fin cooler 5 to be heated.
Is closed, and at the same time, the passage 12 on the side to be bypassed is opened. This returns to the state shown in FIG.
The above-mentioned heating and soaking operation can be performed.

In the above case, whether the cooling chamber 11 or the passage 12 is closed is selectively performed by the switching damper 6. However, if the opening degree of the switching damper 6 is adjusted, the cooling chamber 11 and the cooling chamber 11 are closed. It is also possible to divert gas to the passage 12. In this case, depending on the opening degree, i.e., the split ratio,
The rate of cooling can also be varied.

[0011]

The present invention configured as described above has the following effects. According to the batch oven of the first aspect, when heating the object to be heat-treated, the switching damper closes the bypass passing through the water-cooled fin cooler and opens the passage on the bypass side, so that the gas in the furnace is cooled by the water-cooled fin cooler. Circulates without passing through the cooler. Accordingly, heat loss is eliminated and the burden on the heater is reduced, so that a power-saving heater can be employed. Further, when cooling the object to be heat-treated, the bypass passing through the water-cooled fin cooler is opened, and the passage on the bypassed side is closed, thereby performing heat exchange and rapidly cooling the circulating gas. At this time, since the temperature of the gas drops to near the water supply temperature of the water-cooled fin cooler, the gas cooling temperature can be set with high accuracy by the water supply temperature. Moreover, if the degree of opening is adjusted by the switching damper, it is possible to adjust the temperature drop rate.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a state in which a batch oven according to an embodiment of the present invention is heated and soaked.

FIG. 2 is a cross-sectional view showing a state of the batch oven during cooling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace body 2 Heater 3 Workpiece 4 Fan 5 Water-cooled fin cooler 6 Switching damper 12 Passage A1 Hot air circulation path A2 Gas circulation path

Claims (1)

[Claims] 1. A furnace body that can be sealed, a hot air circulation path provided inside the furnace body, a heater provided in the hot air circulation path, and a heat treatment object provided in the hot air circulation path. And a fan provided in the hot air circulation path to circulate gas between the heater and the object to be heat-treated, and a fan provided in the furnace body and partially on the hot air circulation path. A water-cooled fin cooler arranged to bypass the passage, and a switching damper that controls opening and closing of a bypass passing through the water-cooled fin cooler and opening and closing of a part of the bypassed passage. Batch oven to do.