JP3520023B2 - Low exhaust temperature duct device - Google Patents

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 in an exhaust part of a thermostat for discharging high temperature exhaust gas such as a heat treatment device.

[0002]

2. Description of the Related Art Conventionally, + 20 ° C. (room temperature) to + 500 ° C.
An incubator having a temperature range of 10 and used for a wide range of purposes such as a high temperature life test and a heat resistance test is known.

Such an incubator is shown in FIGS. 8 and 9, for example.
As shown in FIG.
Is formed, and the air sucked from the intake port 102 is heated by the heater 103. The heated air is supplied to the main body 1 by the fan 105 that is rotationally driven by the external motor 104.
01, and is exhausted to the outside from the lower exhaust port 106 through the exhaust duct 107.

[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.

Therefore, there is a demand for the temperature of the exhaust gas to be discharged as low as possible compared to the temperature inside the thermostatic chamber in the exhaust part of the thermostatic chamber where high temperature exhaust gas is generated, such as this heat treatment device.

By the way, as described in, for example, Japanese Patent No. 2544364, the inside of a passage pipe body through which gas flows is used as a device for removing foreign substances in gas.
It is known that it is partitioned by a spiral blade body that forms a plurality of gas passages. In this device, exhaust gas containing a foreign substance and an aqueous solution injected from a nozzle flow in the removing device from the upper side to the lower side while performing a fractional flow and spiral rotation (reversal) in different directions. Repeatedly, the gas and the liquid are mixed and brought into contact with each other, and the fine particles in the exhaust gas are captured by the aqueous solution and collected in the tank arranged below together with the aqueous solution. It is believed that the temperature will drop. However, with that device,
Since the right rotation type element and the left rotation type element are connected by an annular protrusion or the like and the plurality of elements are inserted into the pipe, the structure is complicated and expensive. Become.

The present invention has been made in view of the above circumstances, 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 the incubator. The purpose is to

[0008]

A low exhaust temperature duct device according to the present invention has a low exhaust temperature connected to the exhaust port of a thermostat in which high temperature exhaust is generated and the exhaust is discharged to the outside through an exhaust port. A duct device, a tubular member having one end connected to the exhaust port of the thermostat and the other end open to the atmosphere,
And a spiral member is inserted into the tubular member to form a spiral exhaust passage in said tubular member, said tubular
At the center of the member, one end is open to the outside and the other end is
An inner cylinder member connected to the intake port of the thermostat is provided.
The spiral between the tubular member and the inner tubular member.
A member is provided. That is, the surface area of the tubular member through which the exhaust gas passes is constant, and if the heat exchange rate between the exhaust gas having a high temperature and the outside air having a low temperature is low, the temperature of the exhaust gas does not drop sufficiently, so it is easy to use a spiral member. And with an inexpensive structure, by devising the flow of exhaust,
The heat exchange rate between the exhaust gas and the outside air is increased.

With this configuration, the exhaust gas discharged from the incubator to one end of the tubular member is guided by the spiral member in the tubular member and flows as if it were flowing through the spiral exhaust passage. Cause As a result, the distance through which the exhaust gas passes becomes longer than in the case where it simply flows straight through the tubular member, and the efficiency with which the exhaust gas contacts the tubular member is increased. In this way, since the exhaust gas turns spirally and flows, the entire outer peripheral surface of the tubular member is effectively utilized, and heat exchange is performed between the exhaust gas having a high temperature and the outside air having a low temperature. , The heat of the exhaust gas is easily dissipated to the outside air, and when the exhaust gas is discharged from the other end, it becomes a temperature that is considerably lower than the temperature inside the incubator and is finally discharged to the outside. Become. Hot exhaust air is passed through the tubular member from inside the incubator.
When exhausted to the outside, exhaust gas contacts the outer peripheral surface of the inner cylinder member.
Because it touches, the inner cylinder member is warmed by the exhaust,
The intake air flowing inside the tubular member is heated and newly introduced.
The temperature of the intake air is increased. Therefore, the temperature inside the incubator
Use a heater (eg heater) to keep it constant
If yes, warm the intake air to increase its temperature
In this way, the output value of the heater can be made small and saves energy.
Considered to be advantageous above.

Further, it is preferable that the tubular member further comprises cooling means for blowing cooling air or cooling water onto the outer peripheral surface of the tubular member to cool the exhaust gas flowing in the tubular member.

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

[0012]

[0013]

Further, it is desirable that one end and the other end of the tubular member are respectively a lower end and an upper end of the tubular member.

In this way, since the temperature of the exhaust gas discharged from the incubator is high, it is possible to reasonably generate a spiral exhaust gas flow by utilizing the force of the natural increase of the exhaust gas. Become.

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

According to this structure, during the ventilation operation, the intake air is introduced from the intake port by operating the switching means, so that the heat between the intake air flowing in the tubular member and the exhaust gas flowing around the intake air flows. By replacement, the temperature of the exhaust gas decreases 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, during the temperature drop operation for cooling the inside of the tank, the intake air is introduced from another intake port,
The outside air is sucked as it is without being heated by the exhaust gas.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an incubator 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, an incubator 1 includes an incubator body 2 having an inner tank 2a in which a sample (not shown) or the like is placed, and an incubator body 2 The front opening of the thermostat main body 2 provided on the side through the hinge 3 is provided with a handle 4a.
The door 4 that can be opened and closed by the operation of, the low exhaust temperature duct device 5 provided at the rear part of the thermostat main body 2 for discharging exhaust gas from the inside of the inner tank 2a to the outside, and the thermostat main body 2 And a power distribution unit 6 provided on the side. Incubator 1
Is mounted on the pedestal 7, and an adjuster foot 8 for height adjustment is provided on the lower surface of the pedestal 7.
A shelf plate 2e is provided near the bottom of the inner tank 2,
A sample or the like is placed on the shelf board 2e.

A rectangular air inlet 2b penetrating in the vertical direction is provided in the bottom of the thermostat main body 2, and a circular exhaust port 2c penetrating in the front-rear direction is provided in the lower portion of the back surface. There is. Then, by driving the circulation fan 9 arranged in the inner tank 2a, the intake air sucked from the intake port 2b is heated by a plurality of heaters 10 as a heater to warm the inner tank 2a. The air is discharged to the outside through the exhaust port 2c.

In the power distribution section 6, in order from the upper side, a temperature indicator controller 6a, an overheat protector 6b, an emergency stop push button switch 6c, an integrated time meter 6d, an automatic damper operation switch 6e, and a gas alarm 6f. Are installed.

Further, as shown in FIG. 3, an exhaust port flange member 11 is provided at the exhaust port 2c opened to the lower side of the rear portion of the thermostat main body 2.

An exhaust duct member 13, which is a cylindrical member that serves 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, one side surface of which is provided with a first connection port portion 12a connected to the exhaust port flange 11, and an upper surface portion of which is a lower end portion of the exhaust duct member 13. Is provided with a second connection port portion 12b. The 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 has a substantially cubic shape is to facilitate the attachment of the drain bolt 14, and the shape of the exhaust box does not necessarily have to be such a shape. It is possible to do so.

Inside the exhaust duct member 13, a spiral member 15 formed in a spiral shape (for example, SUS3).
04) is provided, so that the exhaust gas emitted from the exhaust port 2c rises while spirally turning upward from below.
A spiral exhaust passage is formed. The diameter of the central hole formed by the spiral member 15 is such that a spiral exhaust flow can be smoothly formed without difficulty.
It is desirable to make it as small as possible. Further, it goes without saying that the central shaft member may be inserted into the central hole of the spiral member 15 to close the central 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 radially formed.
As shown in FIG. 4 (b), each end portion divided by the cutting line 15 a is vertically shifted to be curved into a spiral shape, which becomes a basic unit constituting the spiral member 15. The spiral element 15B is used. In this way, a plurality of spiral elements 15B are formed, and as shown in FIG.
As shown in FIG. 4, those ends are sequentially connected by welding (welding line 15b), and finally the spiral member 15 having the required length shown in FIG. 4D is obtained.

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

An opening portion 16c into which the sensor portion 17a of the gas sensor 17 is inserted is formed on one side surface portion of the sensor box 16. The lower portion of the gas sensor 17 is placed on a sensor mount 19 fixedly attached to the back surface 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 when mounted.

The exhaust box 12 and the exhaust duct member 1
3 and the sensor box 16 are the exhaust duct cover member 2
It is covered with 0. On both sides of the exhaust duct cover member 20, mounting flange portions 20a and 20b for mounting and fixing to the back surface portion of the thermostat main body 2 are formed,
Further, the notch portion 20 for inserting the sensor portion 17a of the gas sensor 17 is provided in the one mounting flange portion 20a.
c is formed. In addition, the exhaust duct cover member 20
The upper surface of the sensor box 16 has an opening 1
6c is formed with an opening 20d corresponding to the opening 2d.
The exhaust port flange 21 is attached so as to match 0d.

A plurality of cooling fan devices 22 are provided on the other side surface of the exhaust duct cover member 20 to forcibly cool the exhaust duct member 13. 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 may be used.

Further, the tip of the temperature detecting sensor 25 is inserted through the bush 24 into the upper portion of 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 above the incubator body 2, and when an explosion occurs in the inner tank 2a by the explosion vent duct 26, Insulation material (not shown) for the ceiling due to explosion pressure
Bend it and blow it off to the upper wire mesh (not shown),
Explosive pressure escapes from the upper wire mesh.

According to the above-mentioned structure, the spiral exhaust passage is formed by inserting the spiral member 15 into the exhaust duct member 13. It is guided upward and ascends while gradually turning as if flowing through the spiral exhaust passage. As a result, as compared with the case where the exhaust gas rises straight up in the exhaust duct member 13 and is exhausted, the passage length through which the exhaust gas is exhausted becomes longer, and the exhaust gas contacts the exhaust duct member 13. Efficiency is increased, the heat exchange rate between the exhaust gas and the outside air is increased, heat is easily radiated through the exhaust duct member 13, and it is considerably advantageous in reducing the temperature of the exhaust gas.

In addition to this, since the exhaust gas spirally swirls from inside the inner tank 2a and is discharged to the outside, the entire outer peripheral surface of the exhaust duct member 13 is effectively utilized to air-cool the exhaust gas. Therefore, the temperature of the exhaust gas discharged to the outside is considerably lower than that in the case where the exhaust gas flows straight up and is discharged to the outside.

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

Further, the temperature of the exhaust gas discharged from the incubator 1 is high, and the exhaust gas rises while spirally swirling from the lower end portion to the upper end portion of the exhaust duct member 13. The high specific gravity of the exhaust gas has a small specific gravity, and naturally rises while being guided by the spiral member 15 in the exhaust duct 13, which naturally causes a spiral flow.

In the above-described embodiment, the spiral member 15 is only provided inside the exhaust duct member 13. However, as shown in the schematic configuration in FIGS. 5 and 6, the exhaust duct member 13A has a large inner diameter. In addition, the center hole of the spiral member 15A may be made slightly larger, and the intake duct member 21, which is an inner tubular member that constitutes the 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 formed on the back side of the thermostat main body 2 side by side with the exhaust port 2c, but the configuration of the other parts is the same as that of the above-described embodiment.

In this case, as shown in FIG. 5 (a), 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 is the intake duct. The exhaust gas, which is provided so as to project slightly above the upper end portion of the member 11 and is cooled and whose temperature has decreased, is discharged from between the annular flange 21b and the upper end portion of the exhaust duct member 13. On the other hand, the lower end portion 21c of the intake duct member 21 is formed so as to penetrate near the lower end portion of the exhaust duct member 13 and extend substantially parallel to it, as shown in FIG. 5 (b). Then, the lower end portion 13a of the exhaust duct member 13A and the lower end portion 21c of the intake duct member 21 are connected to the exhaust port 2c and the second intake port 2d on the back surface 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 gas flowing around the intake air duct member 21, and the exhaust gas is cooled by the intake air.
The intake air will be heated by the exhaust gas. Therefore, it is possible to raise the temperature of the intake air by utilizing the heat of the exhaust gas during the ventilation operation in which gas and dust are emitted from the test sample placed in the inner tank 2a, and the output of the heater is increased as compared with the conventional case. It is not necessary and is advantageous for saving energy. Particularly, the temperature of the exhaust gas gradually decreases from the lower side to the upper side, while the intake air flows from the upper side to the lower side. Therefore, the intake air is heated by the exhaust gas whose temperature gradually increases, and is efficiently heated.

Further, during the temperature drop operation for cooling the inside of the tank 2a, it is more efficient to suck the outside air as it is (without heating it). Therefore, from the intake port 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 raised by the exhaust gas.

Switching from which of the intake ports 2b and 2d is used to introduce intake air is performed by using a damper member that selectively closes one of the intake ports 2b and 2d. That is, as shown in the schematic configuration in FIGS. 6A and 6B, the damper member 31 is rotatable around a rotary 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 structure is provided on the exhaust port 2c side, and the damper member 32 is parallel to the rotary shaft 31a.
a, a first portion 32b extending in a plane including the rotation shaft 32a, and a second portion which is orthogonal to the first portion 32b and moves along the inner wall surface on the rear surface side to open and close the exhaust port 2c. 32
with c and.

Therefore, during the ventilation operation, as shown in FIG. 7A, the first portion 31 of the damper members 31, 32 is
b, 32b form a closed space around the intake port 2b to block the introduction of intake air through the intake port 2b, while keeping the second intake port 2d in an open state so that the intake air warmed by the exhaust gas Will be introduced into the inner tank 2a through the second intake port 2d. On the other hand, during 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 intake of intake air through the second intake port 2d is blocked. On the other hand, the first portion 31b
Is brought into a state along the bottom surface, so that the intake air is introduced through the intake port 2b, and the outside air is introduced as it is into the inner tank 2a without being warmed.

[0044]

The present invention is carried out in the form as described above and has the following effects.

The low exhaust temperature duct device according to the present invention comprises a tubular member and a spiral member which is inserted into the tubular member and forms a spiral exhaust passage in the tubular member. Therefore, in the spiral member, the exhaust passage formed in the tubular member through which the exhaust gas is discharged becomes long, 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 the exhaust gas discharged to the outside can be made considerably lower than the temperature inside the incubator. The tubular member has intake air at the center.
An inner cylinder member for introducing is provided, and the cylindrical member and the inner cylinder are provided.
The spiral member should be arranged between the member and
For example, while being guided by the spiral member outside the inner cylinder member
The inside of the inner cylinder member is
To heat the intake air flowing through the intake air to efficiently raise the intake air temperature
You can Therefore, reduce the output value of the heater to save energy.
It will be advantageous for the purpose.

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

[0047]

Further, if another intake port for introducing the intake air from the outside as it is and a switching means for switching the introduction of the intake air between the other intake port and the intake port are provided, during ventilation operation or It is possible to easily introduce air having a temperature corresponding to an operating state such as a temperature drop operation by switching the intake port for sucking intake air.

[Brief description of drawings]

FIG. 1 is a front view of an incubator 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.

FIG. 7A and FIG. 7B are operation explanatory views of another embodiment.

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

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

[Explanation of symbols]

1 incubator 2 Incubator 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

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24F 13/00-13/078

Claims (3)

(57) [Claims] 1. A low exhaust temperature duct device connected to the exhaust port of a thermostat for producing hot exhaust gas and discharging the exhaust gas to the outside through an exhaust port, wherein the exhaust port of the thermostat has one end portion. a cylindrical member but the other end is connected is open to the atmosphere, and a spiral member forming a helical exhaust passage is inserted into the tubular member and the tubular member, the tubular At the center of the member, one end is open to the outside
An inner cylinder member whose end is connected to the intake port of the thermostat is provided.
The spa is provided between the tubular member and the inner tubular member.
A low-exhaust-temperature duct device characterized by having an irral member . 2. The low exhaust temperature duct device according to claim 1, further comprising cooling means for blowing cooling air or cooling water onto the outer peripheral surface of the tubular member to cool the exhaust gas flowing in the tubular member. 3. Further, the intake air is directly introduced from the outside.
Of the other intake port and the intake of the other intake port and the intake port
A switching means for switching the introduction is provided.
The low exhaust temperature duct device described .