JP3070645B2 - Internal pressure explosion-proof thermostat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pressure explosion-proof thermostat used in a process gas chromatograph, and more particularly to an improvement in a temperature control mechanism of an internal pressure explosion-proof thermostat.

[0002]

2. Description of the Related Art An explosion-proof structure is used for a constant temperature chamber used for a process gas chromatograph and containing a column, a detector, and the like, and there are a pressure-resistant explosion-proof type and an internal pressure explosion-proof type. In the internal pressure explosion-proof type, an inert gas or air is introduced into a constant temperature bath, and a dangerous gas introduced into a column, a detector, or the like in the constant temperature bath is purged from the inside to prevent explosion.

A conventional internal pressure explosion-proof thermostat will be described with reference to the drawings taking an air bath thermostat as an example. FIG. 3 is a diagram showing a configuration of a conventional air bath type constant temperature bath. In FIG. 3, a column 11 and a heating unit 17 are provided inside a container 10 having an internal pressure explosion-proof structure.
And a temperature sensor (not shown).
A heater 12 is accommodated in 7.

The column 11 is supplied with a carrier gas G3 for carrying the sample to be detected to a detector (not shown). The heating unit 17 is connected to the outside of the container 10 through a pipe 18, and air G 4 is supplied from outside to the heating unit 1 through the pipe 18.
It is sent into 7.

[0005] The temperature sensor detects the temperature inside the container 10 and feeds back the temperature to a controller (not shown) provided outside the container 10 and connected to the heater 12. The output is heated by a heater 12 whose output is controlled, released into the container 10, and exhausted from a pipe 19 provided in the container 10 so as to communicate with the outside.

[0006] In this manner, the air bath type constant temperature bath is capable of combusting gas drawn into the container 10 (for example, carrier gas G3 or gas introduced into the detector when the detector is stored in the container 10). When the gas leaks into the container 10 when the gas leaks, the temperature inside the container 10 is kept constant so that the container 10 does not explode, and the internal pressure is kept at a predetermined pressure or more.

[0007]

Since such an air bath thermostat has a good temperature response, it is possible to perform a temperature rise analysis in which the column temperature is changed with time according to a predetermined plan. In order to maintain constant temperature chamber characteristics such as uniformity of distribution and temperature stability, a large amount of air is required, and the heater capacity must be increased accordingly, resulting in a large power consumption. there were. SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and has as its object to reduce the consumption of purge gas for maintaining the characteristics of the thermostatic chamber and the internal pressure of the heater with reduced power consumption. It is to provide an explosion-proof thermostat.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a purge gas introduced into a container containing a heater is heated by the heater to the outside of the container. In an internal pressure explosion-proof thermostat that discharges and adjusts the temperature and pressure inside the container, at least one of a driving chamber that houses a driving fan provided outside the container, and at least one that communicates the container with the driving chamber. Two communication holes, and a stirring fan connected inside the container to the driving fan via a rotation shaft provided through one of the communication holes, and the driving of the purge gas is performed. The purge gas is stirred by rotating the driving fan and rotating the stirring fan by introducing the purge gas into the chamber through the communication hole and discharging the gas into the container. An internal pressure explosion-proof thermostat, according to claim 2, wherein the low-temperature purge gas introduced into the container containing the heater is heated by the heater and discharged to the outside of the container to discharge the temperature inside the container. And an internal pressure explosion-proof thermostat that adjusts the pressure, a driving chamber that houses a driving fan provided outside the container, a communication hole that communicates the container with the driving chamber, and a communication hole that penetrates the communication hole. A stirring fan connected to the driving fan via a rotating shaft having a hollow structure in which a discharge hole is provided in an inner portion of the container. The purge gas is discharged to the inside of the container through the discharge hole and the driving gas is passed through the driving chamber to rotate the driving fan and rotate the stirring fan. A pressure explosion-proof thermostat characterized by agitating the scan.

[0009]

According to the present invention, in the first aspect,
The container houses the heater and the stirring fan, the driving chamber houses the driving fan, the communication hole connects the container and the driving chamber, and the rotating shaft passes through the communication hole and the driving fan and the stirring fan. The purge gas is introduced into the drive chamber and the drive fan is rotated to pass through the communication hole and is heated by the heater in the container.The drive fan rotates the stirring fan and the stirring fan rotates the purge gas. To adjust the temperature and pressure inside the container. In claim 2, the container houses the heater and the stirring fan, the driving chamber houses the driving fan, and the communication hole connects the container and the driving chamber,
The rotating shaft passes through the communication hole to connect the driving fan and the stirring fan, the driving gas passes through the driving chamber and rotates the driving fan, and the purge gas is introduced into the rotating shaft and is discharged from the discharge hole. It is discharged into the container, heated by a heater in the container, the driving fan rotates the stirring fan, and the stirring fan stirs the purge gas to adjust the temperature and pressure inside the container.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

FIG. 1 is a diagram showing an embodiment of the invention described in claim 1. In FIG. 1, an internal pressure explosion-proof thermostat includes a container 10 and a column 1 housed inside the container 10.
1, a heater 12, a stirring fan 13, a driving chamber 20 provided outside the container 10, and a driving fan 21 housed inside the driving chamber 20.

The agitating fan 13 and the driving fan 21 are connected via a rotary shaft 40 penetrating through a communication hole 15 for communicating the container 10 with the driving chamber 20, and a purge gas G 1 is externally supplied to the driving chamber 20. An inlet 22 for the purge gas G1 is provided at a position where the drive fan 21 is rotated by the introduced jet, and the container 10 is provided with an exhaust port 14 for the purge gas G1.

Next, the operation of the internal pressure explosion-proof thermostat shown in FIG. 1 will be described. When the purge gas G1 is introduced into the drive chamber 20 from the inlet 22, the purge gas G1 is discharged into the container 10 through the communication hole 15 by rotating the drive fan 21.

The rotation of the drive shaft 21
0, the stirring fan 13 rotates to stir the purge gas G1 discharged into the container 10, and the purge gas G1
Is a controller (not shown) externally connected to a temperature sensor (not shown) provided inside the container 10.
The temperature is controlled by a heater 12 whose output is controlled by the heater. Most of the flow is circulated in the container 10, and a part of the flow is exhausted from the exhaust port 14 to the outside of the container 10.

In this case, for example, a few m
If the supply pressure of the purge gas G1 is set so as to give an air flow of about ³ / min, the flow rate does not need to be large.

Further, since the purge gas G1 is agitated, a large flow rate is not required in order to make the temperature inside the vessel 10 uniform, and the required purge gas flow rate is set so that the internal pressure of the vessel 10 exceeds a predetermined pressure satisfying the explosion-proof standard. The flow rate that can be maintained and diluted so that the container 10 does not explode when the carrier gas G3 leaks into the container 10 as the flammable gas drawn into the container 10, for example. Therefore, the capacity of the heater can be reduced accordingly, and the power consumption can be greatly reduced.

On the other hand, when the constant temperature bath is used at a low temperature in the configuration shown in FIG. 1, the purge gas G1 is set to a low temperature in advance. The temperature cannot be reduced effectively. Further, when a vortex tube is used as a cooling device for the purge gas G1, for example, when a back pressure is applied to the tube, the cooling efficiency is deteriorated.
Since pressure is required to rotate 1, back pressure is applied to the tube, and it may be difficult to obtain a sufficiently low temperature. Therefore, when the constant temperature bath is cooled in a short time and used at a low temperature, such a constant temperature bath is not necessarily appropriate.

FIG. 2 shows an embodiment of the invention described in claim 2 and is a view showing the configuration of an internal pressure explosion-proof thermostat suitable for use at low temperatures. In FIG. 2, an internal pressure explosion-proof thermostat comprises a container 10 and a column 1 housed inside the container 10.
1, a heater 12, a stirring fan 13 symmetrically arranged with respect to the heater 12, a driving chamber 30 provided outside the container 10, and a driving fan 21 housed inside the driving chamber 30. Have been.

The agitating fan 13 and the driving fan 21 are connected via a rotary shaft 50 passing through a communication hole 16 for communicating the container 10 with the driving chamber 30.
Has a hollow structure, an inlet 51 for the purge gas G1 is provided in an outer portion of the container 10, an outlet 52 for the purge gas G1 is provided in an inner portion of the container 10, and the exhaust of the purge gas G1 is provided in the container 10. A mouth 14 is provided.

A driving gas G is supplied from outside to the driving chamber 30.
A drive gas inlet 31 is provided at a position where the drive gas 21 is introduced and the drive fan 21 is rotated, and a drive gas exhaust port 32 for exhausting the drive gas G2 to the outside is provided.

Next, the operation of the internal pressure explosion-proof thermostat shown in FIG. 2 will be described. When the purge gas G1 is cooled by a vortex tube (not shown) and is introduced into the rotary shaft 50 from the inlet 51, the purge gas G1 is released from the outlet 52 into the container 10.

On the other hand, when the driving gas G2 is introduced from the driving gas inlet 31 into the driving chamber 30, the driving fan 21 is rotated by the jet of the driving gas G2. The driving gas G2 is supplied from the driving gas discharge port 32 to the driving chamber 3
It is discharged out of 0.

The rotation of the driving fan 21 causes the stirring fan 13 to rotate via the rotary shaft 50, and
The purge gas G1 discharged into the inside of the container 10 is stirred, and the output of the purge gas G1 is controlled by a controller (not shown) connected to a temperature sensor (not shown) provided inside the container 10 and the outside. The temperature is controlled by the exhaust port 14 and exhausted to the outside of the container 10 from the exhaust port 14.

In this case, since the low-temperature purge gas G1 is introduced into the vessel 10 with a small contact area with the metal, it is difficult to exchange heat, and the supply pressure can be reduced, so that the vortex tube can efficiently cool the purge gas G1. Become. Therefore, temperature control that can efficiently lower the temperature of the container 10 becomes possible.

Further, for example, several m ³ /
If the supply pressure of the driving gas G2 is set so as to give an air volume of about min, the flow rate does not need to be large.

Since the purge gas G1 is agitated, a large flow rate is not required to make the temperature inside the container 10 uniform, and the required purge gas flow rate is to maintain the internal pressure of the container 10 at a predetermined pressure or higher, For example, when the carrier gas G3 leaks into the container 10 as the flammable gas drawn into the container 10, the flow rate can be diluted so that the container 10 does not explode. Accordingly, the capacity of the heater 12 can be reduced accordingly, and the power consumption can be greatly reduced.

[0027]

As described above, according to the present invention, since the purge gas is configured so that the flow rate of the purge gas is only the flow rate necessary for explosion-proof, the purge gas for maintaining the characteristics of the constant temperature bath is maintained. Internal pressure explosion-proof thermostat with reduced consumption and power consumption of the heater can be provided. In claim 2, the flow rate of the purge gas is limited to the flow rate necessary for explosion-proof, and the low-temperature purge gas can be supplied without heat exchange. With such a configuration, it is possible to provide an internal pressure explosion-proof thermostat suitable for use at a low temperature by reducing the consumption of the purge gas for maintaining the characteristics of the thermostat and the power consumption of the heater.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the invention described in claim 1;

FIG. 2 is a diagram showing one embodiment of the invention described in claim 2;

FIG. 3 is a diagram showing a configuration of a conventional air bath type constant temperature bath.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Container 12 Heater 13 Stirring fan 15, 16 Communication hole 20, 30 Drive chamber 40, 50 Rotation axis 52 Release hole G1 Purge gas G2 Driving fan

Claims (2)

(57) [Claims] 1. An internal pressure explosion-proof thermostat for heating a purge gas introduced into a container accommodating a heater by the heater and discharging the purge gas to the outside of the container to adjust the temperature and pressure inside the container. A drive chamber that accommodates a drive fan provided outside the container, at least one communication hole that communicates the container with the drive chamber, and a rotation shaft that is provided through one of the communication holes. A stirring fan connected to the driving fan through the inside of the container, and introducing the purge gas into the driving chamber and discharging the purge gas into the container through the communication hole. An internal pressure explosion-proof thermostat, wherein the purge gas is agitated by rotating the agitating fan. 2. An internal-pressure explosion-proof thermostat in which a low-temperature purge gas introduced into a container accommodating a heater is heated by the heater and discharged to the outside of the container to adjust the temperature and pressure inside the container. A driving chamber for housing a driving fan provided outside the container, a communication hole communicating the container with the driving chamber, and a discharge hole penetrating the communication hole and being provided inside the container. A stirring fan connected to the driving fan through the hollow shaft provided inside the container, wherein the purge gas is introduced into the rotary shaft, and the purge gas is introduced into the container through the discharge hole. Internal pressure explosion-proof, wherein the purge gas is agitated by causing the drive gas to pass through the drive chamber and rotating the drive fan and rotating the stirring fan. Type thermostat.