JPH07298107A - Monitoring device for inside of furnace - Google Patents

Abstract

PURPOSE:To keep a CCD camera section within an operating temperature range without the use of a cooling gas supply system even in the case of supervising a large sized check object equipment in which the height of a high temperature environment part is 20m or over. CONSTITUTION:A thermal conductor 2 is fitted closely to an outer circumferential face of a CCD camera body 1 and a thermocouple element 3 is fitted closely to an outer circumferential face of the thermal conductor 2. The thermocouple 3 is made of jointing two kinds of different metals and a temperature difference is caused to both the metals by supplying a current to the thermocouple. A heat is delivered from a low temperature metal to a high temperature metal by dissipating heat from the outer face of the high temperature metal externally. The heat generated from the CCD camera body 1 is delivered from the thermal conductor 2 to the low temperature metal of the thermocouple 3 by supplying a current to the thermocouple 3 so that the low temperature metal of the thermocouple 3 gets a lower temperature than the operating temperature range of the CCD camera body 1 and the high temperature metal gets a higher temperature than the gas temperature of the high temperature environment and the heat generated from the CCD camera is dissipated in the high temperature gas environment part through the convection and radiation of the heat from the high temperature metal of the thermocouple 3 to the high temperature gas environment part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace monitoring device for monitoring the inside of a furnace with a CCD camera.

[0002]

2. Description of the Related Art Conventionally, in order to monitor the inside of a high temperature inspection symmetry device (furnace or vessel) heated to about 200 ° C. with a CCD camera, it is necessary to cool the CCD camera having no heat resistance. In that case, the cooling gas is blown to the CCD camera including the camera head and the camera controller (see FIG. 3), or the cooling gas is blown to the camera head separated from the camera controller (see FIG. 4).

In the case of FIG. 3, a wall 9 is used to store an object to be inspected (not shown) and a high temperature atmosphere portion 10 and a room temperature atmosphere portion 1.
1, the cooling gas pipe 5 and the cable 3 in which the entire CCD camera 1 is built-in are connected from the room temperature atmosphere portion 11 to the wall 9
Inserted into the high temperature atmosphere portion 10 through the opening 12 provided in
The monitor TV 7 and the cooling gas cylinder 8 are connected to the room temperature atmosphere section 1
1, the CCD camera 1 is connected to the monitor TV 7 via the cable 3, while the cooling gas supply pipe 5 is connected to the cooling gas cylinder 8 to cool the CCD camera 1 having no heat resistance by the cooling gas. I am trying.

In the case of FIG. 4, a wall 9 is used to store an object to be inspected (not shown) and a high temperature atmosphere 10 and a room temperature atmosphere 1
1, the CCD camera 1 is separated into a camera head section 1a and a camera controller 6, and the camera head section 1a is separated.
A cooling gas supply pipe 5 and a cable 3 having a built-in are inserted from a room temperature atmosphere portion 11 into a high temperature atmosphere portion 10 through an opening 12 provided in a wall 9, and a monitor TV 7, a cooling gas cylinder 8 and a camera controller having no heat resistance. 6 and 6 are installed in the room temperature atmosphere part 11 to connect the camera head part 1a to the monitor television 7 via the cable 3 outside the cooling gas supply pipe 5 and the camera controller 6 in the room temperature atmosphere part 11 while the cooling gas is supplied. The supply pipe 5 is connected to a cooling gas cylinder 8 so that the camera gas 1a having no heat resistance is cooled by the cooling gas.

[0005]

The reactor monitoring device shown in FIGS. 3 and 4 has the following problems. That is, the in-reactor monitoring device of FIG. 3 can be used when the inspection symmetry device (furnace or container) is small, but in the case of a large inspection symmetry device having a high temperature atmosphere portion 10 of 20 m or more, the cooling gas is in the middle. Is cooled by the cooling gas supply pipe 5, and the cooling capacity of the camera is reduced. In order to prevent this, it is necessary to flow a large amount of cooling gas and at the same time provide the cooling gas supply pipe 5 with sufficient heat insulation.

[0006] The in-reactor monitoring device of Fig. 4 can handle inspection symmetry equipment of a certain size, but if the cable 3 connecting the camera head 1a and the camera controller 6 becomes long, a signal sent by the cable 3 is sent. Was attenuated, and it was difficult to obtain a clear image on the monitor TV 7. The present invention has been proposed in view of the above problems, and an object thereof is to use a cooling gas supply system without using a cooling gas supply system even when monitoring a large inspection symmetrical device having a high temperature atmosphere of 20 m or more. In order to provide a furnace monitoring device that can keep a CCD camera unit in its operating temperature range and does not need to connect a camera head unit and a camera controller with a long cable to obtain a clear image on a monitor TV. There is a point to do.

[0007]

In order to achieve the above object, the present invention relates to an in-furnace monitoring device for monitoring the inside of a furnace by a CCD camera, in which a heat conductor is closely attached to the outer peripheral portion of the CCD camera body. The thermoelectric element is attached to the outer periphery of the heat conductor in a close contact state. In the in-furnace monitoring device, a radiation fin may be attached to the outer surface of the thermoelectric element.

In the in-furnace monitoring device, the CCD camera body, the heat conductor, the thermoelectric element, and the radiation fins may be housed in a duct, and a fan for sucking outside air into the duct may be provided in the duct. In the furnace monitoring device, the CCD
You may attach a heat insulating material to the front and back of a camera body.

[0009]

The CCD camera normally generates heat of several tens of watts. It is necessary to transfer this heat to a high temperature gas atmosphere of about 200 ° C. and dissipate it, but the heat resistant temperature of the CCD camera is about 40 ° C. Generally, considering that heat flows from a high temperature portion to a low temperature portion, the heat generated by the CCD camera cannot be dissipated. However, in the present invention, a heat conductor is attached in close contact with the outer peripheral portion of the CCD camera body. A thermoelectric element is closely attached to the outer peripheral portion of the heat conductor. This thermoelectric element is formed by joining two kinds of dissimilar metals, and when an electric current is applied to the thermoelectric element, a temperature difference occurs between the two metal parts. By radiating heat to the outside from the outer surface of the one metal portion having a high temperature, the temperature of the other metal portion becomes lower than that, and the heat is transferred from the low temperature metal portion to the high temperature metal portion. An electric current is passed through the thermoelectric element so that the low temperature metal portion of the thermoelectric element is lower than the operating temperature range of the CCD camera and the high temperature metal portion is higher than the gas temperature of the high temperature atmosphere portion,
The heat generated from the CCD camera is transferred from the heat conductor to the low temperature metal part of the thermoelectric element, and further transferred from the high temperature metal part of the thermoelectric element to the high temperature gas atmosphere part by convection and radiation, so that the heat generated by the CCD camera is transferred to the high temperature gas atmosphere part. Dissipate.

At this time, the radiation fins attached to the outer surface of the thermoelectric element increase the radiation surface of the thermoelectric element with respect to the high temperature gas atmosphere, thereby improving the radiation ability. Further, the fan sucks the outside air into the duct that houses the CCD camera body, the heat conductor, the thermoelectric element, and the heat radiation fin, and forcibly creates a flow of the outside air around the heat radiation fin to further improve the heat radiation ability. Let

Further, the front surface and the back surface of the CCD camera body are covered with a heat insulating material, and the high temperature gas in the high temperature gas atmosphere portion is covered with C.
Do not let the CD camera body, heat conductor, and thermoelectric element penetrate. Even if heat invades, this heat is dissipated through a path similar to the heat dissipation path from the CCD camera.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The furnace monitoring device of the present invention will be described below with reference to an embodiment shown in FIGS. 1 and 2. 1 is a CCD camera (body), and 2 is a close contact with the outer periphery of the CCD camera 1. The heat conductors 3 are thermoelectric elements attached to the outer periphery of the heat conductor 2 in a close contact state. The heat conductor (conduction block) 2
For this, a metal material having a high thermal conductivity, for example, aluminum is used.

A lead-bismuth element is used for the thermoelectric element 3 when the temperature of the high temperature gas atmosphere is about 200.degree. A power supply cable 9 is connected to the thermoelectric element 3 to form a module (a combination of several sets of elements). Reference numeral 4 is a radiating fin attached to the outer surface of the thermoelectric element 3, 5 and 5 are heat insulating materials (heat insulating blocks) attached to the front and back of the CCD camera body, 6 is a CCD camera cable, and 7 is a CCD camera body 1. Reference numeral 8 denotes a duct for accommodating the heat conductor 2, the thermoelectric element 3, and the radiation fin 4, and 8 denotes a fan for sucking outside air provided in the duct 6.

Next, the operation of the in-furnace monitoring device shown in FIGS. 1 and 2 will be specifically described. As described above, CCD camera 1
Has a fever of tens of watts. 200 this heat
The CCD camera 1 has a heat resistant temperature of about 40.degree.
Considering that heat generally flows from a high temperature portion to a low temperature portion, the heat generation of the CCD camera body 1 cannot be dissipated, but in the present invention, the heat conductor 2 is closely attached to the outer peripheral portion of the CCD camera body 1. Mounted in the same condition, the same heat conductor 2
The thermoelectric element 3 is attached to the outer periphery of the in close contact. The thermoelectric element 3 is formed by joining two kinds of different metals, and when a current is applied to the thermoelectric element 3, a temperature difference occurs between the two metal parts. By radiating heat to the outside from the outer surface of the one metal portion having a high temperature, the temperature of the other metal portion becomes lower than that, and the heat is transferred from the low temperature metal portion to the high temperature metal portion. An electric current is applied to the thermoelectric element 3 so that the low temperature metal portion of the thermoelectric element is lower than the operating temperature range of the CCD camera and the high temperature metal portion is higher than the gas temperature of the high temperature atmosphere portion, The heat generated from the CCD camera body 1 is transferred from the heat conductor 2 to the low temperature metal part of the thermoelectric element 3, and further transferred from the high temperature metal part of the thermoelectric element 3 to the high temperature gas atmosphere part, and the heat generated by the CCD camera is transferred to the high temperature gas atmosphere part. Dissipate.

At this time, the heat radiation fins 4 attached to the outer surface of the thermoelectric element 3 increase the heat radiation surface of the thermoelectric element 3 to the high temperature gas atmosphere portion to improve the heat radiation ability. In addition, the fan 8 sucks the outside air into the duct 7 that houses the CCD camera body 1, the heat conductor 2, the thermoelectric element 3, and the heat radiation fin 4 to generate a forced flow of the air around the heat radiation fin 4. And further improve the heat dissipation ability.

Further, the front and back surfaces of the CCD camera body 1 are covered with the heat insulating materials 5 and 5, and the high temperature gas in the high temperature gas atmosphere portion is charged with the CCD camera body 1, the heat conductor 2 and the thermoelectric element 3.
Do not let it invade. Even if heat invades, this heat is dissipated through a path similar to the heat dissipation path from the CCD camera.

[0017]

As described above, the furnace monitoring device of the present invention ensures that the temperature of the low temperature metal portion of the thermoelectric element is lower than the operating temperature range of the CCD camera and that the temperature of the high temperature metal portion is higher than the gas temperature of the high temperature atmosphere portion. The current from the CCD camera is transmitted from the heat conductor to the low temperature metal part of the thermoelectric element, and convection is performed from the high temperature metal part of the thermoelectric element to the high temperature gas atmosphere part so that the temperature becomes high. By transmitting with radiation,
Since the heat generated by the CCD camera is dissipated in the high temperature gas atmosphere, even when a large inspection symmetrical device with a high temperature atmosphere of 20 m or more is to be monitored, the CCD camera can be used without using the cooling gas supply system. Can be held in range. Further, it is not necessary to connect the camera head section and the camera controller with a long cable, and a clear image can be obtained on the monitor TV.

Further, since the radiation fins attached to the outer surface of the thermoelectric element increase the radiation surface of the thermoelectric element to the high temperature gas atmosphere portion, the heat radiation ability can be improved and the CCD camera portion can be effectively held within its operating temperature range. . In addition, the fan sucks the outside air into the duct that houses the CCD camera body, the heat conductor, the thermoelectric element, and the heat radiation fin, and forcibly creates a flow of the outside air around the heat radiation fin, further improving the heat radiation ability. As a result, the CCD camera section can be effectively maintained within its operating temperature range.

Further, the front surface and the back surface of the CCD camera body are covered with a heat insulating material, and the high temperature gas in the high temperature gas atmosphere portion is covered with C
Do not let the CD camera body, heat conductor, and thermoelectric element penetrate. Even if heat invades, this heat is dissipated through a path similar to the heat dissipation path from the CCD camera, so that the CCD camera section can be more effectively kept in its operating temperature range.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an in-reactor monitoring device of the present invention.

FIG. 2 is a vertical sectional front view taken along the line XX of FIG.

FIG. 3 is a side view showing an example of a conventional in-core monitoring device.

FIG. 4 is a side view showing another example of a conventional in-core monitoring device.

[Explanation of symbols]

 1 CCD camera (body) 2 heat conductor 3 thermoelectric element 4 radiating fins 5, 5 heat insulating material 6 CCD camera cable 7 duct 8 fan 9 power supply cable

Claims (4)

[Claims] 1. A furnace monitoring device for monitoring the inside of a furnace with a CCD camera, wherein a heat conductor is attached in close contact with the outer peripheral portion of a CCD camera body, and a thermoelectric element is in close contact with the outer peripheral portion of the heat conductor. In-reactor monitoring device characterized by being installed in 2. The in-reactor monitoring device according to claim 1, wherein a radiation fin is attached to an outer surface of the thermoelectric element. 3. The duct according to claim 2, wherein the CCD camera body, the heat conductor, the thermoelectric element, and the heat radiation fin are housed in a duct, and a fan for sucking outside air into the duct is provided in the duct. In-furnace monitoring device. 4. The in-furnace monitoring device according to claim 1, wherein a heat insulating material is attached to a front surface and a back surface of the CCD camera body.