EP2250449A1 - Gas boiler having closed-type cistern tank - Google Patents

Gas boiler having closed-type cistern tank

Info

Publication number
EP2250449A1
EP2250449A1 EP08872974A EP08872974A EP2250449A1 EP 2250449 A1 EP2250449 A1 EP 2250449A1 EP 08872974 A EP08872974 A EP 08872974A EP 08872974 A EP08872974 A EP 08872974A EP 2250449 A1 EP2250449 A1 EP 2250449A1
Authority
EP
European Patent Office
Prior art keywords
cistern tank
water
heating water
heating
gas boiler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08872974A
Other languages
German (de)
French (fr)
Inventor
Tae-Sik Min
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyungdong Navien Co Ltd
Original Assignee
Kyungdong Navien Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyungdong Navien Co Ltd filed Critical Kyungdong Navien Co Ltd
Publication of EP2250449A1 publication Critical patent/EP2250449A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/048—Level sensors, e.g. water level sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm

Definitions

  • the present invention relates to a gas boiler having a closed- type cistern tank, and more specifically, to a gas boiler having a closed type cistern tank in which the capacity of the cistern tank is reduced and a separate air separator is not required.
  • gas boilers are divided into atmospheric gas boilers and atmosphere cutoff type gas boilers.
  • FIG. 1 is a schematic view of a conventional atmospheric gas boiler.
  • the atmospheric gas boiler includes a circulation pump 10 which circulates heating water, a main heat exchanger 20 which transmits thermal energy of a burner 21 to the heating water forcibly delivered by the circulation pump 10, a three-way valve 30 which supplies the heating water to a heating pipeline (a place where heating is required) when a heating operation is performed, and supplies the heating water toward a hot- water heat exchanger 40 when hot water is used, the hot water exchanger 40 which supplies hot water by heating cold water, and a cistern tank 50 which stores returned heating water therein and absorbs a pressure change of the heating water.
  • Reference numerals 61, 62, 63, and 64 represent a heating water supply pipe, a heating water returning pipe, a cold water pipe, and a hot water pipe, respectively.
  • the cistern tank 50 includes a water level detecting sensor 51 which detects whether or not the water level of the heating water is maintained in a determined water-level range, and an overflow pipe 52 through the heating water overflows to the outside when the water level of the heating water exceeds a predetermined value. Therefore, the heating water is opened to the atmosphere.
  • Such an atmospheric gas boiler has a simple structure and a low price.
  • the heating water circulation system is opened to the atmosphere, the boiler cannot be installed in a lower place than a heating pipeline (a place where heating is required). Therefore, the gas boiler has a positional limit. Further, since the heating water is exposed to the atmosphere such that oxygen is introduced, corrosion may occur in the heating pipe.
  • FIG. 2 is a schematic view of a conventional atmosphere cut-off type gas boiler.
  • FIG. 3 is a schematic view showing a state before a closed type cistern tank is installed.
  • FIG. 4 is a schematic view showing a case in which the maximum pressure is applied to the cistern tank of FIG. 3.
  • the atmosphere cut-off type gas boiler has almost the same structure as the at- mospheric gas boiler in that a circulation pump 10, a main heat exchanger 20, a burner 21, a three-way valve 30, and a hot- water heat exchanger 40 are provided.
  • the atmosphere cut-off type gas boiler is different from the atmospheric gas boiler in that a cistern tank 70 is constructed in a closed type so as to be isolated from the atmosphere, and an air separator 71, a safety valve 72, and a pressure gauge 73 are additionally installed.
  • the cistern tank 70 is a closed type tank which is isolated from the external air and includes a rubber plate 70a, a gas storing unit 70b, and a heating water storing unit 70c.
  • the rubber plate 70a is interposed between the gas storing unit 70b and the heating water storing unit 70c.
  • the gas storing unit 70b stores gas (for example, nitrogen) therein, and the heating water storing unit 70c stores heating water.
  • the shape of the rubber plate 70a is modified depending on applied pressure, thereby absorbing a pressure change of the heating water.
  • the heating water storing unit 70c is connected to a pipeline through which returned heating water passes.
  • Such an atmosphere cut-off type gas boiler has no limit in its installation position, and can prevent oxygen from being introduced into the heating water because the heating water circulation system is isolated from the atmosphere. On the other hand, it has a complex structure, and a high price. In particular, the air separator is necessary. Further, although the air separator is provided, it is difficult to remove the air from within the pipeline.
  • the cistern tank is not effectively used. That is, as shown in FIG. 4, when the pressure of the heating water is maximized, the gas storing unit 70b needs a space in which nitrogen is compressed. Since this space does not absorb the expanding heating water, it is an unnecessary space. Disclosure of Invention Technical Problem
  • the present invention is directed to a gas boiler having a closed- type cistern tank with no diaphragm, in which the volume of the cistern tank can be reduced.
  • the present invention is also directed to a gas boiler having a closed- type cistern tank which can serve as an air separator, without a separate air separator.
  • the present invention is also directed to a gas boiler having a closed- type cistern tank, which can normally operate a circulation pump even when pressure lower than atmospheric pressure is applied to the cistern tank.
  • a gas boiler having a closed type cistern tank which stores returned heating water and absorbs a pressure change of the heating water.
  • the cistern tank having no diaphragm is constructed in a closed type such that an internal space thereof is isolated from the atmosphere, and includes a heating water inlet through which the heating water is introduced, a heating water outlet through which the heating water is discharged toward a circulation pump, a water level detecting sensor which detects the water level of the heating water stored in the cistern tank, and a safety valve for maintaining the pressure of an internal space of the cistern tank to less than a predetermined value.
  • the safety valve may be installed on the uppermost end portion of the cistern tank so as to discharge the air before the heating water.
  • the cistern tank may be installed adjacent to an entrance of the circulation pump such that air separation is performed in the cistern tank.
  • the water level detecting sensor may be installed in such a manner that the lower end of the water level detecting sensor is adjacent to the bottom surface of the cistern tank.
  • the circulation pump may be normally operated even though the internal pressure of the cistern tank is less than atmospheric pressure.
  • the closed- type cistern tank has no diaphragm, the cistern tank can be easily manufactured, and the volume of the cistern tank can be reduced. [22] Further, even when the internal pressure of the cistern tank is less than atmospheric pressure, the boiler can be normally operated without stoppage. [23] Further, while the heating water circulation system is constructed in a closed type, the air separation can be performed smoothly, without a separate air separator installed.
  • FIG. 1 is a schematic view of a conventional atmospheric gas boiler.
  • FIG. 2 is a schematic view of a conventional atmosphere cut-off type gas boiler.
  • FIG. 3 is a schematic view showing a state before a closed type cistern tank is installed.
  • FIG. 4 is a schematic view showing a case in which the maximum pressure is applied to the cistern tank of FIG. 3.
  • FIG. 5 is a schematic view of a gas boiler having a closed-type cistern tank according to the present invention.
  • FIG. 6 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is sufficient in comparison with the water storage capacity of a heating pipeline.
  • FIG. 7 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is not sufficient in comparison with the water storage capacity of a heating pipeline.
  • FIG. 8 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is excessively smaller than the water storage capacity of a heating pipeline. Best Mode for Carrying Out the Invention
  • FIG. 5 is a schematic view of a gas boiler having a closed-type cistern tank according to the present invention.
  • the gas boiler according to the present invention includes a circulation pump 10 which circulates heating water, a main heat exchanger 20 which transmits thermal energy of a burner 21 to the heating water forcibly delivered by the circulation pump 10, a three-way valve 30 which supplies the heating water to a heating pipeline (a place where heating is required) when a heating operation is performed, and supplies the heating water toward a hot-water heat exchanger 40 when hot water is used, the hot water exchanger 40 which supplies hot water by heating cold water, a heating water supply pipe 61, a heating water returning pipe 62, a cold water pipe 63, and a hot water pipe 64, like the conventional gas boiler.
  • the gas boiler according to the present invention further includes a cistern tank 100.
  • the cistern tank 100 having no diaphragm therein is constructed in a closed type such that heating water stored in the cistern tank 100 does not come in contact with the atmosphere. Therefore, the heating water circulation system is constructed in an atmosphere cut-off type.
  • a water level detecting sensor 110 is installed above the cistern tank 100.
  • the water level detecting sensor 110 includes a short conductive body 110a and a long conductive body 110b, and measures resistance between the short and long conductive bodies 110a and 110b so as to judge whether or not a proper amount of heating water is stored in the cistern tank 100.
  • the short and long conductive bodies 110a and 110b may be installed in such a manner that the lower ends thereof are adjacent to the bottom surface of the cistern tank 100.
  • the water level detecting sensor 110 is installed at an upper end portion of the cistern tank 100.
  • the water level detecting sensor 110 may be installed on a lower portion of a side surface or a bottom surface of the cistern tank 100, with the length of the water level detecting sensor 110 being reduced, or may be installed in a connection pipe between the circulation pump 10 and the cistern tank 100 so as to be substituted with a sensor which detects whether or not heating water is present.
  • a safety valve 120 for maintaining the pressure of an internal space of the cistern tank 100 to less than a predetermined value is installed above the cistern tank 100.
  • the safety valve 120 has a spring provided therein. When the pressure of the internal space of the cistern tank 100 exceeds the elastic force of the spring, the safety valve 120 is opened so as to discharge the air within the cistern tank 100 to the outside, thereby lowering the pressure.
  • the safety valve 120 may be installed on the uppermost end portion of the cistern tank 100 such that the air existing in the upper portion of the cistern tank 100 is discharged before the heating water stored in the cistern tank 100.
  • the cistern tank 100 has a heating- water inlet and outlet 100a and 100b formed in the bottom thereof.
  • the heating- water inlet 110a is connected to the heating water returning pipe 62 such that heating water can be introduced therethrough, and the heating water stored in the cistern tank 100 is discharged through the heating- water outlet 100b toward the circulation pump 10.
  • the heating-water circulation system according to the present invention is constructed in an atmosphere cut-off type, the air introduced into the heating water needs to be separated. In this example embodiment, however, since the air separation is performed in the cistern tank 100, a separate air separator needs to be provided.
  • the cistern tank 100 may be installed adjacent to an entrance 10b of the circulation pump 10.
  • FIG. 6 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is sufficient in comparison with the water storage capacity of the heating pipeline.
  • FIG. 6A shows a case in which the temperature of the heating water decreases so that heating- water pressure is minimized
  • FIG. 6B shows a case in which the temperature of the heating water increases so that the heating-water pressure is maximized. Therefore, only the water level within the cistern tank 100 changes depending on a change in the heating-water pressure, and the pressure within the cistern tank 100 is constantly maintained.
  • FIG. 7 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is not sufficient in comparison with the water storage capacity of a heating pipeline.
  • FIG. 7A shows the cistern tank before the boiler is used after the boiler is installed for the first time.
  • FIG. 7B shows a case in which, when the boiler is used for the first time, heating- water pressure is maximized by an increase in temperature of the heating water.
  • FIG. 7C shows a case in which the temperature of the heating water decreases due to stoppage of a heating operation such that the heating-water pressure is minimized.
  • the pressure within the cistern tank 100 may be less than the atmospheric pressure. Even in this case, if the water level detecting sensor 110 judges that the water level is proper, the boiler is normally operated.
  • FIG. 8 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is excessively smaller than the water storage capacity of a heating pipeline.
  • FIG. 8A shows the cistern tank before the boiler is used after the boiler is installed for the first time.
  • FIG. 8B shows a case in which, when the boiler is used for the first time, heating- water pressure is maximized by an increase in temperature of heating water.
  • FIG. 8C shows a case in which the temperature of the heating water decreases due to stoppage of a heating operation such that the heating-water pressure is minimized.
  • FIG. 8D shows a case in which water is supplemented through the automatic supplementary water valve from the state of FIG. 8C.
  • FIG. 8B the cistern tank is filled up with the heating water, and an air layer disappears.
  • the heating-water pressure is minimized as in FIG. 8C, the water level decreases.
  • the automatic supplementary water valve is operated so as to supplement water. Thereafter, the above-described cycle is repeated.
  • the boiler according to the present invention can be normally operated regardless of the water storage capacity of the heating pipeline. Further, although the cistern tank having no diaphragm is used, the cistern tank can be constructed in a closed type. Therefore, a separate air separator does not need to be provided, and the capacity of the cistern tank can be reduced in comparison with the conventional cistern tank.
  • the capacity of the cistern tank can be reduced, and a separate air separator is not required. Therefore, the gas boiler has industrial applicability.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

Provided is a gas boiler having a closed-type cistern tank with no diaphragm, in which the volume of the cistern tank can be reduced, the closed type cistern tank storing returned heating water and absorbing a pressure change of the heating water. The cistern tank having no diaphragm is constructed in a closed type such that an internal space thereof is isolated from the atmosphere, and includes a heating water inlet through which the heating water is introduced, a heating water outlet through which the heating water is discharged toward a circulation pump, a water level detecting sensor which detects the water level of the heating water stored in the cistern tank, and a safety valve for maintaining the pressure of an internal space of the cistern tank to less than a predetermined value.

Description

Description GAS BOILER HAVING CLOSED-TYPE CISTERN TANK
Technical Field
[1] The present invention relates to a gas boiler having a closed- type cistern tank, and more specifically, to a gas boiler having a closed type cistern tank in which the capacity of the cistern tank is reduced and a separate air separator is not required. Background Art
[2] In general, gas boilers are divided into atmospheric gas boilers and atmosphere cutoff type gas boilers.
[3] FIG. 1 is a schematic view of a conventional atmospheric gas boiler.
[4] The atmospheric gas boiler includes a circulation pump 10 which circulates heating water, a main heat exchanger 20 which transmits thermal energy of a burner 21 to the heating water forcibly delivered by the circulation pump 10, a three-way valve 30 which supplies the heating water to a heating pipeline (a place where heating is required) when a heating operation is performed, and supplies the heating water toward a hot- water heat exchanger 40 when hot water is used, the hot water exchanger 40 which supplies hot water by heating cold water, and a cistern tank 50 which stores returned heating water therein and absorbs a pressure change of the heating water. Reference numerals 61, 62, 63, and 64 represent a heating water supply pipe, a heating water returning pipe, a cold water pipe, and a hot water pipe, respectively.
[5] The cistern tank 50 includes a water level detecting sensor 51 which detects whether or not the water level of the heating water is maintained in a determined water-level range, and an overflow pipe 52 through the heating water overflows to the outside when the water level of the heating water exceeds a predetermined value. Therefore, the heating water is opened to the atmosphere.
[6] Such an atmospheric gas boiler has a simple structure and a low price. However, since the heating water circulation system is opened to the atmosphere, the boiler cannot be installed in a lower place than a heating pipeline (a place where heating is required). Therefore, the gas boiler has a positional limit. Further, since the heating water is exposed to the atmosphere such that oxygen is introduced, corrosion may occur in the heating pipe.
[7] FIG. 2 is a schematic view of a conventional atmosphere cut-off type gas boiler. FIG.
3 is a schematic view showing a state before a closed type cistern tank is installed. FIG. 4 is a schematic view showing a case in which the maximum pressure is applied to the cistern tank of FIG. 3.
[8] The atmosphere cut-off type gas boiler has almost the same structure as the at- mospheric gas boiler in that a circulation pump 10, a main heat exchanger 20, a burner 21, a three-way valve 30, and a hot- water heat exchanger 40 are provided. However, the atmosphere cut-off type gas boiler is different from the atmospheric gas boiler in that a cistern tank 70 is constructed in a closed type so as to be isolated from the atmosphere, and an air separator 71, a safety valve 72, and a pressure gauge 73 are additionally installed.
[9] The cistern tank 70 is a closed type tank which is isolated from the external air and includes a rubber plate 70a, a gas storing unit 70b, and a heating water storing unit 70c. The rubber plate 70a is interposed between the gas storing unit 70b and the heating water storing unit 70c. The gas storing unit 70b stores gas (for example, nitrogen) therein, and the heating water storing unit 70c stores heating water. The shape of the rubber plate 70a is modified depending on applied pressure, thereby absorbing a pressure change of the heating water. The heating water storing unit 70c is connected to a pipeline through which returned heating water passes.
[10] Such an atmosphere cut-off type gas boiler has no limit in its installation position, and can prevent oxygen from being introduced into the heating water because the heating water circulation system is isolated from the atmosphere. On the other hand, it has a complex structure, and a high price. In particular, the air separator is necessary. Further, although the air separator is provided, it is difficult to remove the air from within the pipeline.
[11] Further, when the pressure within the cistern tank is less than the atmospheric pressure, a vacuum may occur in the cistern tank. In this case, since the heating water cannot be circulated normally even when the circulation pump 10 is operated, the circulation pump 10 should be stopped, and water should be supplemented automatically or manually.
[12] Further, in the atmosphere cut-off type gas boiler, the cistern tank is not effectively used. That is, as shown in FIG. 4, when the pressure of the heating water is maximized, the gas storing unit 70b needs a space in which nitrogen is compressed. Since this space does not absorb the expanding heating water, it is an unnecessary space. Disclosure of Invention Technical Problem
[13] The present invention is directed to a gas boiler having a closed- type cistern tank with no diaphragm, in which the volume of the cistern tank can be reduced.
[14] The present invention is also directed to a gas boiler having a closed- type cistern tank which can serve as an air separator, without a separate air separator.
[15] The present invention is also directed to a gas boiler having a closed- type cistern tank, which can normally operate a circulation pump even when pressure lower than atmospheric pressure is applied to the cistern tank. Technical Solution
[16] According to an aspect of the present invention, there is provided a gas boiler having a closed type cistern tank which stores returned heating water and absorbs a pressure change of the heating water. The cistern tank having no diaphragm is constructed in a closed type such that an internal space thereof is isolated from the atmosphere, and includes a heating water inlet through which the heating water is introduced, a heating water outlet through which the heating water is discharged toward a circulation pump, a water level detecting sensor which detects the water level of the heating water stored in the cistern tank, and a safety valve for maintaining the pressure of an internal space of the cistern tank to less than a predetermined value.
[17] The safety valve may be installed on the uppermost end portion of the cistern tank so as to discharge the air before the heating water.
[18] The cistern tank may be installed adjacent to an entrance of the circulation pump such that air separation is performed in the cistern tank.
[19] The water level detecting sensor may be installed in such a manner that the lower end of the water level detecting sensor is adjacent to the bottom surface of the cistern tank.
[20] When the water level detecting sensor judges that the water level is proper, the circulation pump may be normally operated even though the internal pressure of the cistern tank is less than atmospheric pressure.
Advantageous Effects
[21] According to the present invention, since the closed- type cistern tank has no diaphragm, the cistern tank can be easily manufactured, and the volume of the cistern tank can be reduced. [22] Further, even when the internal pressure of the cistern tank is less than atmospheric pressure, the boiler can be normally operated without stoppage. [23] Further, while the heating water circulation system is constructed in a closed type, the air separation can be performed smoothly, without a separate air separator installed.
Brief Description of the Drawings
[24] FIG. 1 is a schematic view of a conventional atmospheric gas boiler.
[25] FIG. 2 is a schematic view of a conventional atmosphere cut-off type gas boiler.
[26] FIG. 3 is a schematic view showing a state before a closed type cistern tank is installed. [27] FIG. 4 is a schematic view showing a case in which the maximum pressure is applied to the cistern tank of FIG. 3. [28] FIG. 5 is a schematic view of a gas boiler having a closed-type cistern tank according to the present invention. [29] FIG. 6 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is sufficient in comparison with the water storage capacity of a heating pipeline.
[30] FIG. 7 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is not sufficient in comparison with the water storage capacity of a heating pipeline.
[31] FIG. 8 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is excessively smaller than the water storage capacity of a heating pipeline. Best Mode for Carrying Out the Invention
[32] Hereinafter, an example embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[33] FIG. 5 is a schematic view of a gas boiler having a closed-type cistern tank according to the present invention.
[34] The gas boiler according to the present invention includes a circulation pump 10 which circulates heating water, a main heat exchanger 20 which transmits thermal energy of a burner 21 to the heating water forcibly delivered by the circulation pump 10, a three-way valve 30 which supplies the heating water to a heating pipeline (a place where heating is required) when a heating operation is performed, and supplies the heating water toward a hot-water heat exchanger 40 when hot water is used, the hot water exchanger 40 which supplies hot water by heating cold water, a heating water supply pipe 61, a heating water returning pipe 62, a cold water pipe 63, and a hot water pipe 64, like the conventional gas boiler.
[35] The gas boiler according to the present invention further includes a cistern tank 100.
The cistern tank 100 having no diaphragm therein is constructed in a closed type such that heating water stored in the cistern tank 100 does not come in contact with the atmosphere. Therefore, the heating water circulation system is constructed in an atmosphere cut-off type.
[36] A water level detecting sensor 110 is installed above the cistern tank 100. The water level detecting sensor 110 includes a short conductive body 110a and a long conductive body 110b, and measures resistance between the short and long conductive bodies 110a and 110b so as to judge whether or not a proper amount of heating water is stored in the cistern tank 100.
[37] In this case, in order to sufficiently secure a space in which the air exists inside the cistern tank 100, the short and long conductive bodies 110a and 110b may be installed in such a manner that the lower ends thereof are adjacent to the bottom surface of the cistern tank 100. [38] In this example embodiment, the water level detecting sensor 110 is installed at an upper end portion of the cistern tank 100. However, the water level detecting sensor 110 may be installed on a lower portion of a side surface or a bottom surface of the cistern tank 100, with the length of the water level detecting sensor 110 being reduced, or may be installed in a connection pipe between the circulation pump 10 and the cistern tank 100 so as to be substituted with a sensor which detects whether or not heating water is present.
[39] A safety valve 120 for maintaining the pressure of an internal space of the cistern tank 100 to less than a predetermined value is installed above the cistern tank 100. The safety valve 120 has a spring provided therein. When the pressure of the internal space of the cistern tank 100 exceeds the elastic force of the spring, the safety valve 120 is opened so as to discharge the air within the cistern tank 100 to the outside, thereby lowering the pressure.
[40] In this case, the safety valve 120 may be installed on the uppermost end portion of the cistern tank 100 such that the air existing in the upper portion of the cistern tank 100 is discharged before the heating water stored in the cistern tank 100.
[41] The cistern tank 100 has a heating- water inlet and outlet 100a and 100b formed in the bottom thereof. The heating- water inlet 110a is connected to the heating water returning pipe 62 such that heating water can be introduced therethrough, and the heating water stored in the cistern tank 100 is discharged through the heating- water outlet 100b toward the circulation pump 10.
[42] Since the heating-water circulation system according to the present invention is constructed in an atmosphere cut-off type, the air introduced into the heating water needs to be separated. In this example embodiment, however, since the air separation is performed in the cistern tank 100, a separate air separator needs to be provided.
[43] In this case, to prevent bubbles from being introduced into the circulation pump 10, the cistern tank 100 may be installed adjacent to an entrance 10b of the circulation pump 10.
[44] Hereinafter, operation of the gas boiler according to the present invention will be described.
[45] Referring to FIG. 5, when the air is introduced into the cistern tank 100 while heating water circulates inside the heating pipeline, and if an amount of the introduced air is small, the air is absorbed into the upper internal space of the cistern tank 110. On the other hand, if an amount of the introduced air is large, the water level of the heating water within the cistern tank 100 decreases. Therefore, when the water level detecting sensor 110 judges that the water level of the heating water is lower than a proper water level, water is supplied through an automatic supplementary water valve (not shown).
[46] As such, when the internal pressure of the cistern tank 100 is less than allowable pressure in a state where the water is supplied, the gas boiler operates as is. On the other hand, when the internal pressure of the cistern tank 100 is more than the allowable pressure, the safety valve 120 is operated so as to discharge the air to the outside.
[47] FIG. 6 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is sufficient in comparison with the water storage capacity of the heating pipeline.
[48] FIG. 6A shows a case in which the temperature of the heating water decreases so that heating- water pressure is minimized, and FIG. 6B shows a case in which the temperature of the heating water increases so that the heating-water pressure is maximized. Therefore, only the water level within the cistern tank 100 changes depending on a change in the heating-water pressure, and the pressure within the cistern tank 100 is constantly maintained.
[49] FIG. 7 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is not sufficient in comparison with the water storage capacity of a heating pipeline.
[50] FIG. 7A shows the cistern tank before the boiler is used after the boiler is installed for the first time. FIG. 7B shows a case in which, when the boiler is used for the first time, heating- water pressure is maximized by an increase in temperature of the heating water. FIG. 7C shows a case in which the temperature of the heating water decreases due to stoppage of a heating operation such that the heating-water pressure is minimized.
[51] When the heating- water pressure is maximized as in FIG. 7B such that the pressure within the cistern tank 100 exceeds the allowable pressure, the safety valve 120 is opened so as to discharge the air to the outside, and the water level of the heating water significantly increases.
[52] Thereafter, when the heating-water pressure is minimized as in FIG. 7C, the pressure within the cistern tank 100 may be less than the atmospheric pressure. Even in this case, if the water level detecting sensor 110 judges that the water level is proper, the boiler is normally operated.
[53] FIG. 8 is diagrams showing cases in which the capacity of the cistern tank according to the present invention is excessively smaller than the water storage capacity of a heating pipeline.
[54] FIG. 8A shows the cistern tank before the boiler is used after the boiler is installed for the first time. FIG. 8B shows a case in which, when the boiler is used for the first time, heating- water pressure is maximized by an increase in temperature of heating water. FIG. 8C shows a case in which the temperature of the heating water decreases due to stoppage of a heating operation such that the heating-water pressure is minimized. FIG. 8D shows a case in which water is supplemented through the automatic supplementary water valve from the state of FIG. 8C.
[55] When the heating- water pressure approaches the maximum allowable value as in
FIG. 8B, the cistern tank is filled up with the heating water, and an air layer disappears. In this state, when the heating-water pressure is minimized as in FIG. 8C, the water level decreases. Further, when the water level detecting sensor 120 judges that the heating water is insufficient, the automatic supplementary water valve is operated so as to supplement water. Thereafter, the above-described cycle is repeated.
[56] As described above, the boiler according to the present invention can be normally operated regardless of the water storage capacity of the heating pipeline. Further, although the cistern tank having no diaphragm is used, the cistern tank can be constructed in a closed type. Therefore, a separate air separator does not need to be provided, and the capacity of the cistern tank can be reduced in comparison with the conventional cistern tank.
[57] While few exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes may be made to these embodiments without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Industrial Applicability
[58] In the gas boiler having a closed type cistern tank according to the present invention, the capacity of the cistern tank can be reduced, and a separate air separator is not required. Therefore, the gas boiler has industrial applicability.
[59]

Claims

Claims
[1] A gas boiler having a closed type cistern tank which stores returned heating water therein and absorbs a pressure change of the heating water, wherein the cistern tank having no diaphragm is constructed in a closed type such that an internal space thereof is isolated from the atmosphere, and includes a heating water inlet through which the heating water is introduced, a heating water outlet through which the heating water is discharged toward a circulation pump, a water level detecting sensor which detects the water level of the heating water stored in the cistern tank, and a safety valve for maintaining the pressure of an internal space of the cistern tank to less than a predetermined value.
[2] The gas boiler according to claim 1, wherein the safety valve is installed on the uppermost end portion of the cistern tank so as to discharge the air before the heating water.
[3] The gas boiler according to claim 1 or 2, wherein the cistern tank is installed adjacent to an entrance of the circulation pump such that air separation is performed in the cistern tank.
[4] The gas boiler according to claim 1 or 2, wherein the water level detecting sensor is installed in such a manner that the lower end of the water level detecting sensor is adjacent to the bottom surface of the cistern tank.
[5] The gas boiler according to claim 1 or 2, wherein when the water level detecting sensor judges that the water level is proper, the circulation pump is normally operated even when the internal pressure of the cistern tank is less than atmospheric pressure.
EP08872974A 2008-02-29 2008-11-24 Gas boiler having closed-type cistern tank Withdrawn EP2250449A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020080018808A KR100951152B1 (en) 2008-02-29 2008-02-29 Gas boiler with hermetic expansion tank
PCT/KR2008/006923 WO2009107923A1 (en) 2008-02-29 2008-11-24 Gas boiler having closed-type cistern tank

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EP2250449A1 true EP2250449A1 (en) 2010-11-17

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US (1) US20110000444A1 (en)
EP (1) EP2250449A1 (en)
KR (1) KR100951152B1 (en)
CN (1) CN101960230A (en)
AU (1) AU2008351482B2 (en)
UA (1) UA102242C2 (en)
WO (1) WO2009107923A1 (en)

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AU2008351482A1 (en) 2009-09-03
KR20090093341A (en) 2009-09-02
AU2008351482B2 (en) 2012-07-12
WO2009107923A1 (en) 2009-09-03
CN101960230A (en) 2011-01-26
US20110000444A1 (en) 2011-01-06
UA102242C2 (en) 2013-06-25
KR100951152B1 (en) 2010-04-06

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