Liquid heaters and vaporizers – Stand boiler – Heated by liquid or steam
Reexamination Certificate
2002-02-12
2004-05-25
Lu, Jiping (Department: 3749)
Liquid heaters and vaporizers
Stand boiler
Heated by liquid or steam
C122S459000
Reexamination Certificate
active
06739288
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a steam-heating apparatus in which a heating section formed in a heat exchanger is connected with a steam supply pipe for receiving supply of heating steam and connected also with a condensate recovering unit for discharging condensate produced as a result of heating.
BACKGROUND ART
An example of such steam-heating apparatus is known from Japanese paten application laid-open No. Hei. 7-328423. In this steam-heating apparatus, as shown in
FIG. 6
, a reaction vessel
1
is provided as a heat exchanger. The reaction vessel includes, as a heating section thereof, a jacket section
2
, to which a steam supply pipe
3
for receiving supply of heating steam and a condensate recovering unit
6
for discharging condensate produced as a result of heating are connected. More particularly, the steam supply pipe
3
is connected to an inlet of a steam ejector
5
and the jacket section
5
as a heating section is connected to a suction chamber
13
formed in an outer periphery of a nozzle communicated with the inlet of the steam ejector
5
. Also, a shutoff valve
47
is connected to an outlet communicated with the suction chamber
13
.
In operation, by opening the shutoff valve
47
, air remaining within the jacket section
2
will be drawn into the suction chamber
13
to evacuate the inside of the jacket section
2
. Thereafter, by dosing the shutoff valve
47
, low-pressure steam is supplied into the jacket section
2
, so that an object in the reaction vessel
1
may be heated by low-temperature steam of 100° C. or lower.
With the conventional steam-heating apparatus described above, the apparatus is capable of steam-heating an object with the air remaining at the initial stage of the heating process being removed by suction. However, this apparatus cannot exhaust air which may be gradually accumulated with progress of the heating process, so that the apparatus becomes unable to maintain a predetermined heating temperature precisely. Specifically, when the heating apparatus is placed under the evacuated condition below the atmospheric pressure, atmospheric air may be inadvertently drawn through in the respective joints of the apparatus, thus leading to gradual accumulation of air inside the heating section. Moreover, the heating steam supplied to the apparatus may contain some air therein. Therefore, disadvantageous accumulation of air inside the heating section occurs not only in the initial stage of the heating process but also during the subsequent heating stage thereof
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a steam-heating apparatus capable of adjusting the heating temperature with high precision by effectively eliminating air which may be accumulated not only in the initial stage of the steam-heating process but also during the subsequent heating stage thereof.
For accomplishing the object noted above, a steam-heating apparatus proposed by the present invention comprises a steam ejector including a suction chamber connected to the heating section and an inlet for receiving supply of heating steam, the steam ejector being actuated in response to a drop in a temperature of the heating section by a predetermined value so as to suck air (an example of gas) in the heating section into the suction chamber of the steam ejector
That is, in response a drop by a predetermined value in the temperature in e.g. the heating section or in a condensate tank disposed between this heating section and the condensate recovering device, the steam ejector is actuated and steam is supplied to the inlet of the steam ejector, whereby a suction force is developed in the suction chamber for sucking the air accumulated in the heating section therein and subsequently exhausting this air to the outside.
Therefore, in the steam-heating apparatus, whenever the temperature of the heating section drops by a predetermined value due to presence of air therein not only in the initial stage of heating, but also during subsequent heating stage thereof, the steam ejector is actuated for sucking and exhausting this air.
Further, in addition to the above-described construction of the steam-heating apparatus, the steam-heating apparatus of the invention may filer comprise a temperature-responsive valve disposed at the inlet of the steam ejector, the temperature-responsive valve being opened in response to the drop by the predetermined value of the temperature of the heating section so as to supply the steam to the inlet of the steam ejector.
That is, by providing the temperature-responsive valve connected to the inlet of the steam ejector, when air has accumulated in the heating section to cause the temperature thereof to drop by a predetermined value, the temperature-responsive valve is opened to introduce steam into the inlet of the steam ejector and the air accumulated in the heating section is withdrawn by the resultant suction force developed in the suction chamber to be exhausted to the outside.
In addition to the above-described construction of the steam-heating apparatus, the steam-heating apparatus of the invention may further comprise a check valve disposed at a connection between the heating section and the suction chamber of the steam ejector, the check valve allowing only unidirectional passage of the air from the heating section to the suction chamber of the steam ejector.
That is, by providing the check valve disposed between the suction chamber of the steam ejector and the heating section or the condensate tank in addition to the temperature-responsive valve connected to the inlet of the steam ejector, when the temperature drops by a predetermined value as a result of accumulation of air inside the heating section or the condensate tank, the temperature-responsive valve is opened to supply steam to the inlet of the steam ejector and the check valve is opened by the resultant suction force of the steam ejector to allow communication of air from the heating section to the suction chamber thereby to suck and exhaust the air accumulated inside the heating section to the outside.
Further, the steam-heating apparatus of the present invention, in addition to the above-described construction of the steam-heating apparatus, further comprises a temperature-responsive valve disposed at a connection between the heating section and the suction chamber of the steam ejector, the temperature-responsive valve being opened in response to a drop by a predetermined value in the temperature of the heating section so as to allow suction of the air from the heating section to the suction chamber of the steam ejector.
That is, by providing a temperature-responsive valve disposed at a connection between the heating section and the suction chamber of the steam ejector, when air has accumulated inside the heating section thus causing a drop in its temperature by a predetermined value, the temperature-responsive valve is opened to establish communication between the heating section and the suction chamber of the steam ejector, whereby the air accumulated in the heating section can be sucked and exhausted to the outside by the resultant suction force developed in the suction chamber.
For accomplishing the object of this invention, the steam-heating apparatus of the present invention comprises a condensate tank disposed between the eating section and the condensate recovering unit and a steam ejector having a suction chamber connected to the heating section or to the condensate tank and an inlet for receiving supply of steam, the steam ejector being actuated in response to a drop by a predetermined value in the temperature inside the heating section or the condensate tank so as to suck air in the heating section or the condensate tank into the suction chamber of the steam ejector.
That is, when the temperature inside the heating section or the condensate tank interposed between the heating section and the condensate recovering unit drops by a predetermined value, the steam ejector is actuated to cause the air in the heating section or
Lu Jiping
TVL Co., Ltd.
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