Abstract: A bell mouth includes an upstream body including an upstream-side opening formed to allow air introduced from an air supply duct to pass through and an upstream measurement portion connected with a differential-pressure acquisition device that uses pressure of the air in the upstream-side opening, in which the air supply duct guides the air into a water-heating device from the outside, a differential-pressure generation part that is located downstream of the upstream body with respect to a flow direction of the air and that has a structure that reduces the pressure of the air passing through the differential-pressure generation part, and a downstream body including a downstream-side opening formed to allow the air passing through the differential-pressure generation part to pass through and a downstream measurement portion connected with the differential-pressure acquisition device that obtains a difference between the pressure of the air passing through the downstream-side opening and facing toward a blower

Abstract: A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

Abstract: A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

Abstract: A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

Abstract: Disclosed is an apparatus for controlling water softeners includes a first water softener that softens and recycles source water, a second water softener that softens and recycles mutually complementarily with the first water softener, and a controller that controls water softening and recycling of the first water softener and the second water softener, based on water softening capabilities of the first water softener and the second water softener.

Abstract: Disclosed is a water softening system including a first filter unit and a second filter unit that selectively performs a removal mode of discharging soft water that contains a smaller amount of an ionic material than source water or a recycling mode of discharging reclaimed water that contains a larger amount of the ionic material than the source water.

Abstract: A quick connector includes a socket having a socket opening and a plug inserted and coupled to the socket opening. The socket includes a socket body having a socket space into which the plug is inserted and a latch that hampers insertion of the plug into the socket space or stops the plug from escaping to the outside. The plug includes an insert body, an insert O-ring that surrounds the insert body, and an insert hook protruding outward from the insert body. The latch includes a latch frame, a latch opening formed in the latch frame, and a latch step that hides part of the latch opening, the latch step being disposed on the latch frame such that when the insert body is inserted into the socket space, the insert O-ring does not make contact with the latch step, but the insert hook makes contact with the latch step.

Abstract: The purpose of the present invention is to provide a smoke tube boiler which can prevent leakage of mixed gas and exhaust gas through a gap between a mix chamber and an ignition bar assembly. To this end, the smoke tube boiler according to the present invention comprises: a mix chamber having a mixing space, in which a combustion gas and air are mixed, and a flat plate type burner, the mix chamber being disposed on the upper side of a combustion chamber; an ignition bar assembly assembled to pass through one side of the mix chamber and extending across the upper portion of the combustion chamber to the lower side of the flat plate type burner; and a sealing means for preventing the mixed gas in the mixing space and an exhaust gas in the combustion chamber from leaking to the outside through a gap between the mix chamber and the ignition bar assembly.

Abstract: The present invention relates to a heat exchanger comprising: a burner for combusting a mixture of air and fuel; and a heat exchange unit in which heat is exchanged between combustion gas caused by the combustion of the burner and a heating medium, wherein the heat exchange unit includes a plurality of unit plates stacked on each other, and a sensible-heat exchange unit and a latent-heat exchange unit coaxially disposed around the burner are integrally formed with the unit plates.

Abstract: Disclosed is a water softening system for removing an ionic material contained in source water supplied from a water source and providing soft water to a source of demand, including a filter unit that removes the least a portion of the ionic material contained in the source water based on an electric force and discharge the soft water, a supply passage that supplies the source water to the filter unit, a discharge passage that discharges water from the filter unit, a circulation passage connecting the discharge passage and the supply passage, a filter management material provider that provides a filter management material used to manage a performance of the filter unit to water that flows along the circulation passage, and a pump that pumps, together with the filter management material, the water that flows along the circulation passage to the filter unit.

Abstract: The purpose of the present invention is to provide a tube assembly for a tubular heat exchanger and a tubular heat exchanger comprising the same, the tube assembly for a tubular heat exchanger being capable of enhancing efficiency in heat exchange between a heat medium and a combustion gas and also preventing high-temperature oxidation and the burn-out of a turbulator caused by the combustion heat of the combustion gas and preventing the deformation or damage of a tube which may occur in an environment with a high water pressure, thereby improving the durability thereof.

Abstract: Disclosed is a water softening system includes a first and a second filter unit that selectively performs any one of a removable mode discharging soft water including less ionic material than a source water, and a recycling mode of discharging reclaimed water including more ionic material than the source water, a first and a second supply passage that supplies the source water to the first and the second filter unit, a first and a second discharge passage that discharges the soft water or the reclaimed water from the first and the second filter unit, a first recovery passage part that guides at least a portion of the reclaimed water in the first discharge passage to the second supply passage, and a second recovery passage part that guides at least a portion of the reclaimed water in the second discharge passage to the first supply passage.

Abstract: A hot water returning system according to the present disclosure includes a hot water generator that generates hot water, a hot water line that supplies the hot water to a source of demand, a water returning line that returns the hot water to the hot water generator for preheating the hot water in the hot water line, a pump which pumps the hot water for returning of the hot water, and a processor electrically connected to the pump, and the processor is configured to determine a need for preheating corresponding to whether it is necessary to preheat the hot water and a status for use of hot water corresponding to whether the hot water is supplied to a source of demand, and control the pump based on the need for preheating and the status for use of hot water.

Abstract: The present disclosure provides a cap and a water-heating device having the same. The cap for covering a top side of a case of the water-heating device includes a cover having a receiving space that is open at the bottom, the cover including an exhaust hole formed therein for releasing exhaust gas in the case to the outside, and an exhaust duct that is received in the receiving space and coupled to the cover and that forms an exhaust channel that connects an exhaust tube included in the case and the exhaust hole and releases the exhaust gas, in which the exhaust duct is formed of a material different from a material of the cover, and the material of the exhaust duct has higher heat resistance than the material of the cover.

Abstract: An oil boiler includes an outer container having openings at opposite ends, a combustion chamber that covers an opening at an upper end of the outer container and in which a combustion reaction occurs, a lower cover that covers an opening at a lower end of the outer container, a plurality of flue tubes to heat heating water flowing in the outer container by guiding combustion gas, a burner including a fuel nozzle that sprays fuel, an air nozzle that injects air, and a spark plug that ignites a mixture of the fuel and the air, and a flame tube part that defines a tube space by surrounding a partial space in which the mixture is ignited, the flame tube part including a flame tube having an open lower end and a recirculation hole formed through the flame tube such that the combustion gas is introduced into the flame tube.

Abstract: An exhaust duct includes an upper duct being open at opposite ends thereof and a lower duct being open at a tip end thereof. One end of the upper duct is connected, inside an enclosure of a water-heating device, to an exhaust adaptor disposed on the enclosure, and an opposite end of the upper duct communicates with the tip end of the lower duct. The upper duct is connected to the lower duct so as to be slidable along a reference direction in which the lower duct extends from the tip end of the lower duct, and the upper duct is configured to be separated from the exhaust adaptor by sliding along the reference direction.

Abstract: An aspect of the present disclosure provides a flow channel cap plate that constitutes a combustion chamber assembly including a combustion chamber and a plurality of insulating pipelines disposed on left/right side surfaces of the combustion chamber, the flow channel cap plate forming an insulating flow channel by covering the front surface of the combustion chamber, the flow channel cap plate including an inlet part including an inlet, and an inlet flow channel cap covering the front surface of the combustion chamber, an inlet space part is formed by covering the front surface of the combustion chamber with the inlet flow channel cap, the inlet is an entrance of the insulating flow channel, the plurality of insulating pipelines include a plurality of inlet insulating pipelines, and the inlet space part is a space that communicates the inlet with the plurality of inlet insulating pipelines.

Abstract: The apparatus for supplying hot water comprises: at least one processor; a heat exchanger connected to the at least one processor, and configured to receive tap water through a tap water inflow pipe, heat the supplied tap water by means of heat exchange to thereby generate hot water, and discharge the generated hot water through a hot water supply pipe; a burner configured to directly or indirectly provide heat required to generate the hot water; a mixing valve connected to the at least one processor and installed on a mixing pipe connecting the tap water inflow pipe and the hot water supply pipe, and configured to mix the tap water with the hot water discharged from the heat exchanger and flowing through the hot water supply pipe; and a memory connected to the at least one processor and configured to store instructions.

Abstract: The present subject matter includes a heat exchange part having heating medium channels, through which heating medium flows, and combustion gas channels, through which combustion gas burned in a burner flows, adjacently disposed in alternation in the spaces between the plurality of plates, the heat exchange part being provided in multiple numbers in a stacked structure, and having a heating medium distribution part for narrowing the channel at points where the flow direction of the heating medium is switched in adjacently located heating medium channels.