Abstract: A device for preventing initial hot water from being discharged from a double pipe heat exchanger and a method of controlling the same, which can temporarily mix cold water with hot water so as to decrease the temperature of the discharged hot water when the high temperature water is initially discharged from the double pipe heat exchanger.

Abstract: Disclosed is a hot water supplying apparatus having an auxiliary heat exchanger. The hot water supplying apparatus comprises: a heat exchanger including an inlet pipe for introducing heating water into the heat exchanger, and first, second, and third heat exchanging pipes connected to the inlet pipe and sequentially arranged; and an auxiliary heat exchanging device installed at an inlet port of the heat exchanger through which the heating water is introduced, the auxiliary heat exchanging device including a first auxiliary heat exchanging pipe connecting the inlet pipe to the first heat exchanging pipe, a second auxiliary heat exchanging pipe connecting the second heat exchanging pipe to the third heat exchanging pipe, and heat transfer fins for transferring heat energy from the second auxiliary heat exchanging pipe to the first auxiliary heat exchanging pipe.

Abstract: A boiler capable of simultaneously performing a heating operation and a hot water operation and readily controlling the temperature of the hot water. In the boiler primary heating water is heated by a burner in a main heat exchanger and is supplied to a place in need of heating to be used as heating water. Secondary heating water exchanges heat with the primary heating water in an instant heat exchanger and is supplied to a place in need of hot water to be used as hot water. The boiler includes a flow regulator so that the primary heating water is supplied to the place in need of heating after flowing through the flow regulator which regulates flow depending on heating load, and is subsequently supplied to the instant heat exchanger after regulation by the flow regulator depending on hot water load.

Abstract: The present invention relates to a plane type heat exchanger that has a simple structure and can be easily manufactured by substituting a rectangular plane type for a spiral cylindrical type of the structure of a heat exchange pipe according to the related art which is used for a heat exchanger using combustion gas that is heated by a burner and makes laminar flow.

Abstract: Disclosed is a combustion apparatus using an air fuel ratio sensor, which detects the operation of the air fuel sensor based on pressure of gas and air introduced into a combustion chamber and adjusts the amount of gas and air introduced into the combustion chamber using a controller based on data detected by the air fuel sensor.

Abstract: A gas boiler having a closed cistern tank with no diaphragm, in which the volume of the cistern tank can be reduced, the closed cistern tank storing returned heating water and absorbing pressure changes of the heating water. The cistern tank having no diaphragm has an internal space that 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.

Abstract: A method and an apparatus are provided for preventing coagulation in an exhaust pipe of a boiler is provided. The method includes operating the boiler and executing a combustion stroke, determining if an ambient air temperature measured by an ambient air temperature detecting sensor is equal to or lower than a first temperature, shifting a 3-way valve to a hot-water location if the measured ambient air temperature is equal to or lower than the first temperature, executing an extinction stroke of a burner if the temperature of space heating water reaches a second temperature, and operating a circulation pump and a blower to exchange heat in a heat exchanger and to discharge warm air through an exhaust pipe, thereby preventing coagulation in the exhaust pipe of the boiler.

Abstract: The present invention relates to a heat exchanger and a manufacturing method of a heat exchanging pipe composing it that are capable of preventing the flow of exhaust gas from being obstructed because the heat exchanging pipe is expanded and a space between the heat exchanging pipes is narrowed due to a water pressure of heating water flowing in the inside of the heat exchanging pipe. In order to implement this, according to the present invention, in a heat exchanger with a heat exchanging pipe where heating water flows therein and that has a rectangular cross section in which a width of a side being in contact with combustion gas is larger than a height, the heat exchanging pipe has a shape for offsetting deformation by previously considering deformation of the heat exchanging pipe generated by water pressure of the heating water flowing therein.

Abstract: An object of the present invention is to provide a burner having variable output structure that maintains the speed of a mixture injected through flame holes at a predetermined speed or more by supplying gas through a gas valve at a predetermined pressure or more, and prevents the occurrence of backfire at a low output by adjusting an opened area of the flame holes. In order to achieve the object, according to the present invention, a burner having variable output structure includes a flame-hole plate that includes a plurality of flame holes formed on the surface thereof exposed to a combustion chamber, and a flame hole adjusting unit that changes an output by adjusting the size of each flame hole according to load required in a combustion device.

Abstract: The present invention relates to a heat exchanger applied to a boiler, and an object of the present invention is to provide a heat exchanger that can improve heat transfer efficiency by reducing distance between the heat exchange pipes while making a heating water passage passing through heat exchange pipes be long, and can be easily manufactured. In order to achieve the heat exchanger, according to the present invention, heat exchanger includes a heat exchange device, first and second subsidiary plates, and first and second end plates. The heat exchange device includes a plurality of heat exchange pipe units through which heating water passes and which are spaced apart from each other at regular intervals, and the heat exchange pipe units are provided between a heating water inlet and a heating water outlet, and are formed of pipes having a rectangular cross-section of which a side coming in contact with the combustion gas has a width large than the height.

Abstract: The present invention relates to a flow control valve that controls the flow rate of heated water that is supplied from a boiler, in a pipe line through which the heated water flows. It is an object of the invention to provide a flow control valve that can normally/reversely turn and control the flow rate using two low price one-way motors and stop power for one motor when the other motor is rotated by applying a simple clutch structure to a gear assembly connected with two one-way motors.

Abstract: A heat exchanger of a non-condensing storage type boiler for preventing condensation is provided. The heat exchanger include a heating water outflow port installed on an upper portion of the boiler, a heating water inflow port installed lower than the heating water outflow port, and an internal pipe extending spirally from the heating water inflow port and being installed in a water tube of the boiler. The internal pipe is connected to an extension pipe that extends through a re-entry outlet passing through a wall of the boiler to be connected with a re-entry inlet.

Abstract: Provided is a method for operating a non-condensing boiler at maximum non-condensation efficiency, and more particularly a method for operating a non-condensing boiler, capable of supplying an appropriate amount of excess air for combustion of a burner, avoiding damaging a heat exchanger due to the condensed water generated at the heat exchanger, and effectively improving the heat efficiency.

Abstract: Disclosed is a double pipe heat exchanger for a boiler supplying heating water and hot water, which can prevent water from being condensed even if cold heating water or cold water is introduced into an inlet of the heat exchanger in the boiler for supplying heating water and hot water The heat exchanger includes: a plurality of outer heating water pipes to which combustion heat is applied from a burner of a combustion chamber; a plurality of inner pipes, each of which is inserted in each outer pipe; a returned heating water pipe in which cold heating water is introduced; and a cold water pipe in which cold water is introduced, wherein the returned heating water pipe and the cold water pipe are connected to one of the inner pipes.

Abstract: Disclosed are a device for preventing initial hot water from being discharged from a double pipe heat exchanger and a method of controlling the same, which can temporarily mix cold water with hot water so as to decrease the temperature of the discharged hot water when the high temperature water is initially discharged from the double pipe heat exchanger.

Abstract: Provided is a method for operating a non-condensing boiler at maximum non-condensation efficiency, and more particularly a method for operating a non-condensing boiler, capable of supplying an appropriate amount of excess air for combustion of a burner, avoiding damaging a heat exchanger due to the condensed water generated at the heat exchanger, and effectively improving the heat efficiency.

Abstract: Disclosed are an instantaneous boiler and a double pipe heat exchanger for the instantaneous boiler supplying heating water and hot water, which can obtain hot water output larger than heating water output, simultaneously use the heating water and the hot water, and have a simple piping structure. The heat exchanger includes: an outer pipe used for a hot water pathway, to which combustion heat is directly transferred from a burner in a combustion chamber; and an inner pipe used for a heating water pathway and extending through the outer pipe.

Abstract: The present invention provides a water flow control valve, which has an improved structure, thus reducing manufacturing costs and increasing the reliability of products. To achieve the above-mentioned purpose, the water flow control valve includes synchronous motors (20), which generate drive forces in directions opposite each other, an eccentric cam (30), which is provided between the synchronous motors (20) and converts a direction in which the drive force is transmitted, a power transmission unit (50), which is in rolling contact with the eccentric cam and adjusts the amount of fluid that flows through a housing using operation of the eccentric cam, and ratchet gears (40), which are provided between the synchronous motors and the eccentric cam and transmit the drive force of one of the synchronous motors while preventing the drive force of the remaining synchronous motor from being transmitted in a no-load operation manner.

Abstract: Disclosed is a hot water supplying apparatus having an auxiliary heat exchanger. The hot water supplying apparatus comprises: a heat exchanger including an inlet pipe for introducing heating water into the heat exchanger, and first, second, and third heat exchanging pipes connected to the inlet pipe and sequentially arranged; and an auxiliary heat exchanging device installed at an inlet port of the heat exchanger through which the heating water is introduced, the auxiliary heat exchanging device including a first auxiliary heat exchanging pipe connecting the inlet pipe to the first heat exchanging pipe, a second auxiliary heat exchanging pipe connecting the second heat exchanging pipe to the third heat exchanging pipe, and heat transfer fins for transferring heat energy from the second auxiliary heat exchanging pipe to the first auxiliary heat exchanging pipe.

Abstract: Disclosed is a hot water supplying apparatus which has a dual pipe capable of transferring heat energy of hot water, which is heated by heat of combustion of a burner and flows in pipe of a heat exchanger, to an inner pipe in which cold water is introduced, thereby inhibiting the condensation of moisture so as to prevent the corrosion of parts in the hot water supplying apparatus. The hot water supplying apparatus, comprises: a burner for supplying heat; a water inlet pipe for supplying cold water; a heat exchanging pipe formed with a dual pipe including an outer pipe for directly receiving combustion heat of the burner, and an inner pipe formed in the outer pipe, for allowing the cold water, which is introduced through the water inlet pipe, to be heated while passing through the inner pipe; and a water outlet pipe for discharging the heated water from the heat exchanging pipe.