Automatic temperature and humidity regulation – Closed fluid heaters – Flow controlled
Reexamination Certificate
2002-04-08
2003-11-18
Wayner, William (Department: 3744)
Automatic temperature and humidity regulation
Closed fluid heaters
Flow controlled
C236S08000G, C122S014220, C122S014310
Reexamination Certificate
active
06648235
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a control method of a thermostatic system and, more particularly, to a control method applicable to a water heater, wherein two electromagnetic valves are exploited to exactly control gas outflow at the gas outlet. Thereby, thermostatic control of the water heater can be achieved.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a gas switch control system
10
is installed in a prior art water heater. The gas switch control system
10
comprises a gas inlet
11
for inputting gas, a first gas outlet
12
for outputting gas to a main stove, and a second gas outlet
13
for outputting gas to a pilot flame. A valve
14
is arranged between the gas inlet
11
and the first gas outlet
12
and the second gas outlet
13
. The action of the valve
14
is controlled by a water pan
15
. When cold water is input from a cold water inlet
16
into the water pan
15
, the valve
14
will be pushed open so that gas can be transferred from the gas inlet
11
to the first gas outlet
12
and the second gas outlet
13
.
A switch middle seat
17
is installed between the first gas outlet
12
and the second gas outlet
13
. The switch middle seat
17
comprises an upper lid
18
and a bottom seat
19
, which are assembled to form a hollow shell. A valve sheet
20
made of resilient material such as rubber is installed in the switch middle seat
17
. The valve sheet
20
is fixedly gripped between the upper lid
18
and the bottom seat
19
. The valve sheet
20
is connected to a connecting link
21
. One end of the connecting link
21
has a valve
22
. The valve
22
can be used to control the open or close of the first gas outlet
12
.
The valve sheet
20
partitions the switch middle seat
17
into a first gas room
23
and a second gas room
24
. A first electromagnetic valve
25
and a second electromagnetic valve
26
are installed on the side wall of the second gas room
24
. The first electromagnetic valve
25
is normally open and situated between the first gas room
23
and the second gas room
24
. The first electromagnetic valve
25
can be used to control the open or close state between the first gas room
23
and the second gas room
24
. The second electromagnetic valve
26
is normally close and situated between the second gas room
24
and the second gas outlet
13
. The second electromagnetic valve
26
can be used to control the open or close state between the second gas room
24
and the second gas outlet
13
, i.e., the open or close of the second gas outlet
13
.
When cold water is input from the cold water inlet
16
into the water pan
15
, the valve
14
will be pushed open through the water pan
15
. Therefore, gas can be transferred from the gas inlet
11
into the first gas room
23
of the switch middle seat
17
. Gas can also be transferred via the first electromagnetic valve
25
at open state to the second gas room
24
. At this time, the second electromagnetic valve
26
can be controlled to be open so that gas can be transferred to the pilot flame via the second gas outlet
13
, hence facilitating action of ignition. When the pilot flame has been ignited, the first electromagnetic valve
25
can be controlled to be close so that gas in the second gas room
24
will be gradually burned out. At this time, the gas pressure in the first gas room
23
will be larger than that in the second gas room
24
. Therefore, gas will push the valve sheet
20
to move toward the direction of the second gas room
24
. The valve
22
will be jointly moved toward the direction of the switch middle base
17
through the connecting link
21
. The first gas outlet
12
can thus be controlled to be open so that gas can be output via the first gas outlet
12
to the main stove.
However, in the above gas switch control system
10
of prior art, the first electromagnetic valve
25
and the second electromagnetic valve
26
can only make a simple on or off action. Gas outflow of the first gas outlet
12
output to the main stove can not be exactly controlled so that thermostatic control of the water heater can not be achieved.
SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The primary object of the present invention is to provide a control method of a thermostatic system, wherein two electromagnetic valves of a thermostatic system of a water heater can be controlled to perform the control of gas charge and discharge of a second gas room so as to push a valve sheet forwards or backwards. Thereby, gas outflow of a first gas outlet output to a hot water heater can be exactly controlled so that the linkage with temperature change of the water heater is more apparent. Thermostatic control of the water heater can thus be achieved.
To achieve the above object, the present invention provides a control method of a thermostatic system. When gas outflow output to a main stove is too large, the first electromagnetic valve is controlled to be open and the second electromagnetic valve is controlled to be closed. Gas will be transferred from the first gas room to the second gas room. The control of gas charge of the second gas room is thus performed so as to decrease the open degree of the first gas outlet used to output gas to the hot water heater, hence decreasing gas outflow. When gas outflow output to the hot water heater is too small, the first electromagnetic valve is controlled to be closed and the second electromagnetic valve is controlled to be open. Gas cannot be transferred to the second gas room, and gas in the second gas room can be output via the second gas outlet used to output gas to a pilot flame. The control of gas discharge of the second gas room is thus performed so as to increase the open degree of the first gas outlet, hence increasing gas outflow.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which:
REFERENCES:
patent: 2685411 (1954-08-01), Penn et al.
patent: 4627416 (1986-12-01), Ito et al.
Guard Sound Industry Co., Ltd.
Rosenberg , Klein & Lee
Wayner William
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