JP2596149Y2 - 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 the internal pressure explosion-proof thermostat.

[0002]

2. Description of the Related Art A constant temperature bath used for a process gas chromatograph and containing a column, a detector, and the like has an explosion-proof structure. The structure includes a pressure-resistant explosion-proof type and an internal pressure explosion-proof type. The internal pressure explosion-proof type is designed to prevent explosion by introducing an inert gas or air into a thermostat and purging a dangerous gas introduced into a column, a detector or the like in the thermostat from the inside.

A conventional internal pressure explosion-proof thermostat will be described with reference to the drawings. FIG. 2 is a diagram showing the configuration of a conventional internal pressure explosion-proof thermostat. In FIG. 2, a column 11 and a temperature sensor (not shown) are accommodated inside a container 10 having an internal pressure explosion-proof structure.
A heater 16 is provided, which communicates with the inside of the heater. The heater 12 is accommodated in the heater 16.

The column 11 is supplied with a carrier gas G2 for carrying a sample to be detected to a detector (not shown). Then, the air G <b> 3 is introduced from the outside into the container 10 via the heating unit 16.

[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. It is heated by a heater 12 whose output is controlled, introduced into the container 10, and exhausted from a pipe 17 provided in the container 10 so as to communicate with the outside.

[0006] The internal pressure explosion-proof thermostat is thus filled with gas drawn into the container 10 (eg, carrier gas G2 or gas introduced into the detector when the detector is stored in the container 10). In order to prevent the container 10 from exploding when it is a flammable gas and leaks into the container 10, the temperature inside the container 10 is kept constant and the internal pressure is kept at a predetermined pressure or higher.

[0007]

In such a conventional internal pressure explosion-proof thermostat, when the thermostat is used at a high temperature of about 350 ° C., for example, the heater must provide a large amount of heat to air at normal temperature. In addition, it is necessary to increase the capacity of the heater in order to increase the heating rate of the thermostat,
As a result, there is a problem that the power consumption of the heater increases. In addition, since the temperature is changed from room temperature to high temperature, there is a problem that the temperature controllability is not good. The present invention has been made in view of the above-mentioned conventional problems, and has as its object the purpose of the present invention is to provide an internal pressure explosion-proof thermostat that has a high heating rate, can reduce power consumption, and has excellent temperature controllability. Is to provide a tank.

[0008]

In order to achieve the above object, the present invention ripens a purge gas introduced into a container and discharges the purge gas to the outside of the container to reduce the temperature and pressure inside the container. In the internal pressure explosion-proof thermostat to be adjusted, a first pipe portion provided on the wall of the container and communicating the inside and the outside of the container has an opening in the center of a plate shape, and is arranged inside the container, A first partition member that forms the introduction path of the purge gas in a gap with the wall; and a first partition member that penetrates the inside of the first pipe portion and has one end connected to the opening of the first partition member.
The other end is arranged outside the container , forming an inlet for the purge gas in a gap between the inner wall of the first pipe portion,
A second pipe portion having the inside as a discharge path of the purge gas,
It is provided at a desired position to narrow the exit portion of the introduction path,
A throttle portion for increasing the flow rate of the purge gas, and a flow hole that is disposed in a plate shape and faces the first partition member, allows the purge gas in the container to pass therethrough, guides a portion of the purge gas to the discharge path, and discharges the gas to the outside of the container. The purge gas that has passed through the constriction section forms a circulation path in which the remainder of the purge gas in the container is sucked through the flow hole and circulates in the container in a gap with the first partition member. An internal pressure explosion-proof comprising: a second partition member; and a heater provided near the outlet of the circulation path and the introduction path and heating the purge gas passing through the circulation path and the introduction path. It is a mold thermostat.

[0009]

According to the present invention, the first pipe portion connects the inside and the outside of the container, the first partition member forms a purge gas introduction passage in a gap between the inside wall of the container and the second pipe portion. A purge gas inlet is formed in the gap through the inside of one pipe portion, and the inside is used as a purge gas discharge path. The throttle section narrows the outlet portion of the introduction path to increase the flow rate of the purge gas, and the flow holes formed in the plate-shaped second partition member allow the purge gas to pass therethrough and send a part thereof to the discharge path, and the second partition member is The remainder of the purge gas is formed in the gap between the first partition member and the circulation path to be circulated through the container by being sucked through the circulation hole,
The heater heats the purge gas that has passed through the circulation path and the introduction path.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 1 is a diagram showing a specific embodiment of the present invention. In FIG. 1, a first pipe portion 14 for communicating the inside and the outside of a container 10 having an internal pressure explosion-proof structure is provided with a wall 13 of the container 10.
Is provided.

A column 11, a heater 12, a temperature sensor (not shown), a first partition member 20, a second pipe portion 21, a throttle portion 30, and a second partition member 40 are provided inside the container 10. I have.

The plate-like first partition member 20 has an opening 2 at the center.
2 and disposed inside the container 10 and the second pipe portion 21
Is connected to the opening 22 through the first pipe portion 14. The introduction path 23 for the purge gas G1 is
An inlet 24 for the purge gas G1 is formed in the gap between the first pipe portion 14 and the second pipe portion 21 in the gap between the inside of the wall 13 and the first partition member 20. The inside of the second pipe portion 21 is a discharge path 25 for the purge gas G1.

The throttle section 30 is provided annularly inside the wall 13 to narrow the width of the outlet of the introduction path 23. The plate-shaped second partition member 40 has a flow hole 41 in the center, is disposed inside the container 10 so as to face the first partition member 20, and the circulation path 42 of the purge gas G1 is
0 and the second partition member 40. Further, the annular heater 12 includes a circulation path 42 and an introduction path 23.
Is provided near the outlet.

Next, the operation of the internal pressure explosion-proof thermostat shown in FIG. 1 will be described. A normal temperature purge gas G1 is introduced into the container 10 from the inlet 24 through the introduction path 23, and the temperature sensor detects the temperature inside the container 10 and detects the temperature.
The feedback is provided to a controller (not shown) which is provided outside the “0” and connected to the heater 12. And
The purge gas G1 introduced into the container 10 is supplied to a heater 12 whose output is controlled by an instruction from a controller.
And the temperature is adjusted to a high temperature.

On the other hand, when the purge gas G1 passes through the introduction passage 23, its flow velocity increases in the throttle portion 30, so that the vicinity of the outlet of the circulation passage 42 is in a negative pressure state. Therefore, container 1
Purge gas G1 which has been introduced into the inside of P.O.
Is partly sucked through the circulation hole 41 and the circulation passage 42 by the eject effect, and after passing through the circulation passage 42, is further heated by the heater 12 and circulates inside the container 10, and the rest passes through the circulation hole 41. As a result, the gas is exhausted to the outside of the container 10 from the discharge passage 25.

In such an internal pressure explosion-proof thermostat, a part of the purge gas G1 heated by the heater 12 is circulated through the inside of the container and mixed with the normal temperature purge gas G1 to be further heated. The amount of heat given to G1 can be reduced to increase the heating rate, and the capacity of the heater 12 can be reduced to reduce power consumption. Further, since the width of the temperature change can be reduced, the temperature controllability in that range can be improved.

[0018]

As described above, the present invention is configured to heat a part of the purge gas while circulating the inside of the container, so that the rate of temperature rise is large, power consumption can be reduced, and temperature control can be performed. It is possible to provide an internal pressure explosion-proof thermostat having excellent heat resistance.

[Brief description of the drawings]

FIG. 1 is a diagram showing a specific embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional internal pressure explosion-proof thermostat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Container 12 Heater 13 Wall 14 First pipe part 20 First partition material 21 Second pipe part 22 Opening 23 Introductory path 24 Inlet 25 Discharge path 30 Restricted part 40 Second partition material 41 Flow hole 42 Circulation path G1 Purge gas

Claims (1)

(57) [Scope of request for utility model registration] 1. An internal pressure explosion-proof thermostat for ripening a purge gas introduced into a container and discharging the purge gas to the outside of the container to adjust the temperature and pressure inside the container. A first pipe portion communicating between the inside and the outside of the container, a first pipe portion having an opening at a plate-shaped center, disposed inside the container, and forming a purge gas introduction path in a gap with the wall; A partition member, penetrating through the inside of the first pipe portion, one end of which is in the opening of the first partition member;
A second pipe portion connected and the other end arranged outside the container, forming a purge gas introduction port in a gap with an inner wall of the first pipe portion, and having an inside as a discharge path of the purge gas; It is provided at a desired position to narrow the exit part of the road,
A restricting portion for increasing the flow rate of the purge gas; and a flow hole that is disposed in a plate shape and faces the first partition member, allows the purge gas in the container to pass therethrough, and guides a part of the purge gas to the discharge path and discharges the gas to the outside of the container. The purge gas that has passed through the constriction section forms a circulation path in which the remainder of the purge gas in the container is sucked through the flow hole and circulates in the container in a gap with the first partition member. An internal pressure explosion-proof comprising: a second partition member; and a heater provided near the outlet of the circulation path and the introduction path and heating the purge gas passing through the circulation path and the introduction path. Type thermostat.