JP2001263773A - Low temperature exhaust duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge exhaust gas at a temperature significantly lower than the temperature in a thermostat through a simple structure. SOLUTION: A spiral exhaust passage is formed by inserting a spiral member 15 into an exhaust duct member 13. Exhaust gas is guided by the spiral member 15 and ascends while turning as if it flows through a spiral exhaust passage. Cooling air is blown to the outer circumferential surface of the exhaust duct member 13 by means of a cooling fan 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-exhaust-temperature duct device used for an exhaust portion of a thermostat that exhausts high-temperature exhaust gas, such as a heat treatment device.

[0002]

2. Description of the Related Art Conventionally, from + 20 ° C. (room temperature) to + 500 ° C.
A thermostat having a temperature range of 1 to 3 and used for a wide range of applications such as a high temperature life test and a heat resistance test is known.

Such a thermostat is, for example, shown in FIGS.
As shown in FIG.
Is formed, and the air sucked from the air inlet 102 is heated by the heater 103. The heated air is supplied to the main body 1 by a fan 105 driven to rotate by an external motor 104.
01, and is evacuated to the outside through an exhaust duct 107 from a lower exhaust port 106.

[0004]

However, with such an exhaust duct structure, the exhaust gas discharged from the exhaust duct has an exhaust temperature close to the temperature inside the main body 101.

[0005] Therefore, there is a demand that the temperature of the exhaust gas be exhausted at a temperature as low as possible in the exhaust part of a thermostat in which high-temperature exhaust gas is generated, such as a heat treatment device.

As described in, for example, Japanese Patent No. 2544364, as a device for removing foreign substances in a gas, the inside of a passage tube through which a gas flows is provided.
There has been known one partitioned by a spiral blade body forming a plurality of gas passages. In this apparatus, while the exhaust gas containing the foreign substance and the aqueous solution injected from the nozzle flow through the removal device from above to below, the partial flow and the helical rotation (reversal) in different directions are performed. The gas and liquid are mixed and contacted repeatedly, and the fine particles in the exhaust gas are captured by the aqueous solution and collected together with the aqueous solution in a tank disposed below. It is believed that the temperature decreases. However, with that device,
The right-rotating type element and the left-rotating type element are connected via an annular projection or the like, and are constructed by inserting a plurality of these elements into a pipe. Become.

The present invention has been made in view of the above points, and provides a low-exhaust-temperature duct device having a simple and inexpensive structure and capable of discharging exhaust gas at a temperature considerably lower than the temperature in a thermostat. The purpose is to:

[0008]

SUMMARY OF THE INVENTION A low exhaust temperature duct apparatus according to the present invention has a low exhaust temperature connected to the exhaust port of a thermostat in which a high temperature exhaust gas is generated and the exhaust gas is exhausted to the outside through an exhaust port. A duct device, a cylindrical member having one end connected to the exhaust port of the thermostat and the other end open to the atmosphere,
A spiral member that is inserted into the cylindrical member and forms a spiral exhaust passage in the cylindrical member.
That is, the surface area of the cylindrical member through which the exhaust gas passes is constant, and when the heat exchange rate between the high-temperature exhaust gas and the low-temperature outside air is low, the temperature of the exhaust gas does not sufficiently decrease. The heat exchange rate between the exhaust and the outside air is increased by devising the flow of the exhaust with a low-cost structure.

With this configuration, the exhaust gas discharged from the thermostat to one end of the cylindrical member is guided by the spiral member in the cylindrical member, and flows as if flowing through a spiral exhaust passage. Is generated. As a result, as compared with the case where the exhaust gas simply flows straight through the inside of the tubular member, the distance over which the exhaust gas passes becomes longer, and the efficiency with which the exhaust gas contacts the tubular member is increased. As described above, since the exhaust gas flows while spirally circling, heat exchange is performed between the high-temperature exhaust gas and the low-temperature external air by effectively utilizing the entire outer peripheral surface of the tubular member. The heat of the exhaust gas is easily radiated to the outside air, and when the exhaust gas is discharged from the other end, the temperature becomes considerably lower than the temperature in the thermostat, and is finally discharged to the outside. Become.

It is preferable that the tubular member further includes cooling means for blowing cooling air or cooling water onto the outer peripheral surface of the tubular member to cool exhaust gas flowing through the tubular member.

With this configuration, the cooling means blows cooling air or cooling water onto the outer peripheral surface of the cylindrical member, and forcibly cools so as to actively remove heat of the exhaust gas. The cooling effect of the exhaust gas is further enhanced by the synergistic effect of the natural cooling by the flow of air and the forced cooling by the cooling means.

Further, the cylindrical member is provided with an inner cylindrical member through which intake air flows at a central portion, and the spiral member is provided between the cylindrical member and the inner cylindrical member. You can also.

With this arrangement, when the high-temperature exhaust gas is exhausted from the inside of the thermostat through the cylindrical member, the exhaust gas contacts the outer peripheral surface of the inner cylindrical member. As a result, the intake air flowing inside the inner cylinder member is heated, and the temperature of the newly introduced intake air is increased. Therefore, when a heater (for example, a heater) is used to maintain a constant temperature in the thermostat, the output value of the heater can be reduced by heating the intake air and increasing the temperature. It is advantageous in saving energy.

Preferably, one end and the other end of the tubular member are a lower end and an upper end of the tubular member, respectively.

With this configuration, since the temperature of the exhaust gas discharged from the thermostat is high, it is possible to easily generate a spiral flow of the exhaust gas by utilizing the power of the natural increase of the exhaust gas. Become.

Further, it is also possible to provide another intake port for directly introducing the intake air from the outside, and switching means for switching the introduction of intake air between the another intake port and the intake port.

In this way, in the ventilation operation, the intake air is introduced from the intake port by operating the switching means during the ventilation operation, so that the heat between the intake air flowing through the cylindrical member and the exhaust flowing around the cylindrical member is obtained. The replacement causes the temperature of the exhaust to decrease while the temperature of the intake air increases. Therefore, it is not necessary to increase the output of the heater, which is advantageous in saving energy.

On the other hand, at the time of the temperature lowering operation for cooling the inside of the tank, the intake air is introduced from another intake port.
External air is sucked as it is without being heated by the exhaust gas.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a thermostat according to the present invention, and FIG.
Is a side view of the same, and FIG. 3 is an exploded perspective view of the same.

As shown in FIGS. 1 to 3, a thermostat 1 includes a thermostat main body 2 having an inner tank 2a in which a sample (not shown) and the like are placed. A front opening of the incubator main body 2 provided on the side via a hinge 3 is provided with a handle 4a.
A low-exhaust temperature duct device 5 provided at the rear of the thermostat main body 2 for discharging exhaust gas from the inside of the inner tank 2a to the outside; And a power distribution unit 6 provided on a side part. Incubator 1
Is mounted on a gantry 7, and an adjuster foot 8 for height adjustment is provided on a lower surface of the gantry 7.
A shelf plate 2e is provided near the bottom in the inner tank 2,
A sample or the like is placed on the shelf 2e.

A rectangular air inlet 2b penetrating vertically is provided at the bottom of the thermostat main body 2, and a circular outlet 2c penetrating vertically is provided at a lower portion of the back surface. I have. Then, when the circulation fan 9 disposed in the inner tank 2a is driven, the intake air sucked from the inlet port 2b is heated by a plurality of heaters 10 as heaters to warm the inner tank 2a. , And are discharged to the outside through the exhaust port 2c.

The power distribution unit 6 includes, in order from the top, a temperature instruction controller 6a, an over-temperature prevention device 6b, an emergency stop push button switch 6c, an integrating time counter 6d, an automatic damper operation switch 6e, and a gas alarm 6f. And so on.

Further, an exhaust port flange member 11 is provided in an exhaust port 2c opened below the rear portion of the thermostat main body 2, as shown in FIG.

An exhaust duct member 13 which is a tubular member serving as an exhaust passage for exhausting exhaust gas is connected to the exhaust port flange member 11 via an exhaust box 12.
The exhaust box 12 has a substantially cubic shape, is provided with a first connection port 12a connected to the exhaust port flange 11 on one of side faces, and a lower end of the exhaust duct member 13 on an upper face. Is provided with a second connection port 12b. A drain bolt 1 is provided on the lower surface of the exhaust box 12 for draining the exhaust box 12.
4 is detachably screwed. The reason why the exhaust box 12 is formed in a substantially cubic shape is to facilitate attachment of the drain bolt 14, and the shape of the exhaust box does not necessarily have to be such. It is possible to do.

A spiral member 15 (for example, SUS3) formed in a spiral shape is provided inside the exhaust duct member 13.
04) is disposed, so that the exhaust gas discharged from the exhaust port 2c rises while spirally turning upward from below.
A spiral exhaust passage is formed. The diameter of the center hole formed by the spiral member 15 is set so that a spiral exhaust flow can be smoothly and smoothly formed.
It is desirable to make it as small as possible. In addition, it goes without saying that the center shaft member may be inserted into the center hole of the spiral member 15 to close the center hole.

In order to manufacture such a spiral member 15, first, as shown in FIG. 4 (a), one annular work 15A is cut, and then a cutting line 15a is cut in the radial direction.
Then, as shown in FIG. 4 (b), each end part cut by the cutting line 12a is shifted upward and downward to bend into a spiral shape, and becomes a basic unit constituting the spiral member 15. It is assumed that the spiral element is 15B. In this way, a plurality of spiral elements 15B are formed, and FIG.
As shown in FIG. 4, these ends are sequentially connected by welding (welding line 15b), and finally, a spiral member 15 having a required length shown in FIG.

A substantially cubic sensor box 16 is connected to the upper end of the exhaust duct member 13. The sensor box 16 has flange portions 16a for attachment to both sides of the thermostat main body 2 side, and a first connection port (not shown) to which the upper end of the exhaust duct member 13 is connected on the lower surface. ) Is provided, and an opening 16b communicating with an exhaust port flange described later is formed on the upper surface.

An opening 16c into which the sensor portion 17a of the gas sensor 17 is inserted is formed on one side surface of the sensor box 16. The lower part of the gas sensor 17 is mounted on a sensor mounting table 19 fixed to the back of the thermostat main body 22 via a cushion material 18 (for example, neoprene sponge rubber). The gas sensor 17 is adjusted so that the sensor portion 17a is located at the center of the exhaust passage at the time of attachment.

The exhaust box 12, the exhaust duct member 1
3 and the sensor box 16 are the exhaust duct cover member 2
0. At both sides of the exhaust duct cover member 20, mounting flange portions 20a and 20b for mounting and fixing to the rear portion of the thermostat main body 2 are formed.
Further, a notch portion 20 for inserting the sensor portion 17a of the gas sensor 17 is provided in one of the mounting flange portions 20a.
c is formed. Also, the exhaust duct cover member 20
The opening 1 of the upper surface of the sensor box 16 is
An opening 20d corresponding to the opening 2d is formed.
An exhaust port flange 21 is attached so as to coincide with 0d.

A plurality of cooling fan devices 22 are provided above the other side surface of the exhaust duct cover member 20 so that the exhaust duct member 13 is forcibly cooled. The cooling fan device 22 is covered with a fan guard 23. Further, instead of the cooling fan device 22, a cooling device that blows cooling water can be used.

Further, a distal end of a temperature detecting sensor 25 is inserted through a bush 24 above the other side surface of the exhaust duct cover member 20.

As shown in FIGS. 1 and 2, an explosion vent duct 26 is provided on the upper part of the thermostat main body 2, and when the explosion vent duct 26 causes an explosion in the inner tank 2a, Insulation of ceiling (not shown) by explosion pressure
And blow it up to the top wire mesh (not shown)
Explosive pressure is released from the upper wire mesh to the outside.

According to the above configuration, the spiral exhaust passage is formed by inserting the spiral member 15 into the exhaust duct member 13, so that the exhaust from the spiral member 15 can be performed from below. The air is guided upward and gradually rises while turning, as if it were flowing through a spiral exhaust passage. As a result, as compared with the case where the exhaust gas rises straight in the exhaust duct member 13 and is exhausted, the passage length before the exhaust gas is exhausted to the outside becomes longer, and the exhaust gas contacts the exhaust duct member 13. As a result, the heat exchange rate between the exhaust air and the outside air is increased, the heat is easily radiated through the exhaust duct member 13, and the temperature of the exhaust gas is considerably reduced.

In addition, since the exhaust gas flows from the inner tank 2a while spirally turning and is discharged to the outside, the exhaust gas is air-cooled by effectively utilizing the entire outer peripheral surface of the exhaust duct member 13. As a result, the temperature of the exhaust gas discharged to the outside is considerably lower than in the case where the exhaust gas flows straight up and is discharged to the outside.

Further, since cooling air is blown to the outer peripheral surface of the exhaust duct member 13 by the cooling fan device 22, natural cooling by elongating the exhaust passage and forced cooling by cooling air from the cooling fan device 22 are performed. The synergistic effect further enhances the exhaust cooling effect.

Further, the temperature of the exhaust gas discharged from the thermostat 1 is high, and the exhaust gas is made to rise while spirally turning from the lower end to the upper end of the exhaust duct member 13. The exhaust gas having a high specific gravity has a small specific gravity and naturally rises while being guided by the spiral member 15 in the exhaust duct 13, thereby causing a spiral flow without difficulty.

In the above-described embodiment, only the spiral member 15 is provided inside the exhaust duct member 13, but as shown in FIGS. 5 and 6, the inner diameter of the exhaust duct member 13A is increased. At the same time, the center hole of the spiral member 15A may be made slightly larger, and the intake duct member 21, which is an inner cylindrical member constituting an intake passage through which intake air flows downward from above, may be inserted to form a low exhaust temperature duct device. it can. In this case, a second intake port 2d is opened on the back side of the thermostat main body 2 alongside the exhaust port 2c, but the configuration of other parts is the same as in the above-described embodiment.

In this case, as shown in FIG. 5A, the intake duct member 21 has an annular flange 21b at the upper end of an inner cylindrical portion 21a coaxial with the exhaust duct member 13, and the upper end has an intake duct. The cooled and cooled exhaust gas is discharged between the annular flange 21b and the upper end of the exhaust duct member 13 so as to project slightly above the upper end of the member 11. On the other hand, as shown in FIG. 5B, the lower end 21c of the intake duct member 21 penetrates near the lower end of the exhaust duct member 13 and extends substantially parallel thereto. The lower end 13a of the exhaust duct member 13A and the lower end 21c of the intake duct member 21 are connected to the exhaust port 2c and the second intake port 2d on the back of the thermostat main body 2, respectively.

In this way, heat is exchanged between the intake air flowing through the intake duct member 21 and the exhaust flowing around the intake duct member 21, and the exhaust is cooled by the intake air.
The intake air will be heated by the exhaust air. Therefore, during the ventilation operation in which gas and dust are emitted from the test sample disposed in the inner tank 2a, the temperature of the intake air can be increased by using the heat of the exhaust gas, and the output of the heater is increased as compared with the conventional case. There is no need to do so, which is advantageous in saving energy. In particular, the temperature of the exhaust gas gradually decreases from lower to upper, while the intake air flows from upper to lower. Therefore, the intake air is heated by the exhaust gas whose temperature gradually increases, and is efficiently heated.

In the temperature lowering operation for cooling the inside of the tank 2a, it is more efficient to inhale the external air as it is (without heating). Therefore, it is more efficient to inhale the external air from the inlet 2b provided at the bottom of the thermostat main body 2. The intake air is not introduced through the intake duct member 21 in which the intake air is introduced and the temperature of the intake air is increased by the exhaust gas.

Switching between the intake ports 2b and 2d for introducing the intake air is performed by using a damper member for selectively closing one of the intake ports 2b and 2d. That is, as schematically shown in FIGS. 6A and 6B, the damper member 31 is rotatable about a rotation shaft 31a provided along the rectangular intake port 2b and opens and closes the intake port 2b. It has a first portion 31b and a second portion 31c which is orthogonal to the first portion 31b and moves along the inner wall surface on the back side to open and close the second intake port 2d, and is rotated by an actuator (not shown). By rotating the shaft 31a, the intake port 2
Switching between b and 2d is performed. Further, a damper member 32 having a similar configuration is provided on the exhaust port 2c side, and the damper member 32 is connected to a rotating shaft 32 parallel to the rotating shaft 31a.
a, a first portion 32b extending in a plane including the rotation shaft 32a, and a second portion orthogonal to the first portion 32b and moving along the inner wall surface on the back side to open and close the exhaust port 2c. 32
c.

Therefore, during the ventilation operation, as shown in FIG. 7A, the first portions 31 of the damper members 31, 32 are provided.
b, 32b, a closed space is formed around the intake port 2b to block the introduction of intake air through the intake port 2b, while the second intake port 2d is opened to make the intake air warmed by exhaust gas. Is introduced into the inner tank 2a through the second intake port 2d. On the other hand, at the time of the temperature drop operation, as shown in FIG. 7B, the second intake port 2d is closed by the second portion 31c of the damper member 31, and the introduction of intake air through the second intake port 2d is shut off. On the other hand, the first portion 31b
Is arranged along the bottom surface, and the intake air is introduced through the intake port 2b, so that the external air is introduced into the inner tank 2a as the intake air without being heated.

[0044]

The present invention is embodied in the form described above, and has the following effects.

The low exhaust gas temperature duct apparatus according to the present invention includes a tubular member and a spiral member inserted into the tubular member and forming a spiral exhaust passage in the tubular member. Therefore, the exhaust passage formed in the tubular member from which the exhaust gas is discharged by the spiral member becomes longer, and the exhaust gas can be efficiently cooled by effectively utilizing the entire outer peripheral surface of the tubular member. With a simple and inexpensive structure, the temperature of exhaust gas discharged to the outside can be considerably lower than the temperature in the thermostat.

Further, if cooling air or cooling water is blown to the outer peripheral surface of the tubular member, the cooling effect of the exhaust gas can be further enhanced by the combined use of forced cooling with cooling air or cooling water.

Further, the cylindrical member is provided with an inner cylindrical member at a central portion for introducing the intake air, and the spiral member is provided between the cylindrical member and the inner cylindrical member. For example, the intake air flowing inside the inner cylinder member is heated by the high-temperature exhaust gas discharged outside while being guided by the spiral member outside the inner cylinder member, and the intake air temperature can be efficiently increased. Therefore, it is advantageous in reducing the output value of the heater to save energy.

Further, by providing another intake port for directly introducing the intake air from the outside and switching means for switching the introduction of the intake air between the another intake port and the intake port, it is possible to reduce the time required for ventilation operation. Air having a temperature corresponding to an operation state such as a temperature drop operation can be easily introduced by switching an intake port for inhaling intake air.

[Brief description of the drawings]

FIG. 1 is a front view of a thermostat according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a perspective view of a spiral member according to the present invention.

FIG. 5 is an explanatory diagram of another embodiment.

FIG. 6 is an explanatory diagram of another embodiment.

FIGS. 7 (a) and 7 (b) are explanatory diagrams of an operation of another embodiment.

FIG. 8 is a schematic configuration diagram of a conventional device.

9 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incubator 2 Incubator main body 2a Inner tank 2b Intake port 2c Exhaust port 2d Second intake port 5 Low exhaust temperature duct device 10 Heater 13 Exhaust duct member 15 Spiral member 22 Cooling fan device 21 Intake duct member 31 Damper member

Claims (4)

[Claims] 1. A low-exhaust temperature duct device connected to the exhaust port of a thermostat in which high-temperature exhaust gas is generated and the exhaust gas is exhausted to the outside through an exhaust port, wherein one end portion is provided at the exhaust port of the thermostat. And a spiral member which is inserted into the cylindrical member and forms a helical exhaust passage in the cylindrical member. Exhaust temperature duct device. 2. The low exhaust temperature duct apparatus according to claim 1, further comprising cooling means for blowing cooling air or cooling water onto an outer peripheral surface of said cylindrical member to cool exhaust gas flowing through said cylindrical member. 3. An inner cylindrical member having one end open to the outside and the other end connected to the air inlet of the thermostat is provided at a center of the cylindrical member. 3. The low exhaust gas temperature duct device according to claim 1, wherein the spiral member is disposed between the spiral member and the inner cylinder member. 4. The low exhaust system according to claim 3, further comprising another intake port for directly introducing the intake air from the outside, and switching means for switching the introduction of the intake air between the another intake port and the intake port. Temperature duct device.