NORITZ CORPORATION Patent applications |
Patent application number | Title | Published |
20160091263 | HEADER OF HEAT EXCHANGER AND HEAT EXCHANGER PROVIDED WITH THE SAME - A header of a heat exchanger including a first wall connected with a plurality of heat transfer tubes of the heat exchanger, a second wall facing the first wall with an interval therebetween, and a circumferential wall connecting outer circumferential edges of the first and the second walls in such a manner that an area between the first and the second walls constitutes a chamber for inflow of fluid, the chamber communicating with each of the heat transfer tube. At least one of the first and the second walls is configured to curve in such a manner that a central area of the wall is positioned close to an inside of the chamber than an outer circumferential area of the wall. The thickness of the header is reduced and enough strength of the header is obtained, thereby preferably enduring repeating water hammer. | 03-31-2016 |
20160076768 | Combustion Apparatus Supplying Combustion Air Via Suction Type Fan and Method for Controlling the Same - In a suction fan type combustion apparatus, when an air supply/exhaust path of a combustion and heating unit is clogged, a combustion fan has a degraded fan current for the same fan rotation speed. Furthermore, the suction fan type configuration has the combustion and heating unit's internal pressure reduced as the combustion fan rotates faster. A combustion burner supplies fuel gas with a pressure applied thereto, which is regulated by a gas proportional valve. A degree of opening of the gas proportional valve is corrected in a direction allowing the pressure to be reduced, in accordance with a rate of degradation of a fan current relative to a reference current following a reference current characteristic. This control for correction is done with the fan current degradation rate smoothed (or low-pass filtered) in a time base direction. | 03-17-2016 |
20160069587 | FAN ASSEMBLY AND WATER HEATER - A fan assembly includes a fan and an emission connection portion. The fan includes a fan case having a first internal space, an impeller, and a rotation shaft. The emission connection portion includes a connection portion case having a second internal space and provided with an emission port for emitting gas sent from the fan to the outside of the fan assembly through the second internal space. In a plan view from a direction of axis of the rotation shaft, a tongue portion extending from one end toward the other end is located at a boundary between the first internal space and the second internal space, and the tongue portion is provided to extend to a position at least reaching a straight line connecting a center point of the emission port and a center of rotation of the rotation shaft to each other, from one end toward the other end. | 03-10-2016 |
20160060873 | METHOD OF INSTALLING EXHAUST TUBE - A method of installing an exhaust tube is implemented by inserting an exhaust tube into an exhaust pipe that leads from the inside of a building to the outside thereof. Utilizing an already-placed exhaust pipe, a new exhaust tube is inserted into this exhaust pipe. The exhaust tube is installed according to a procedure of: performing, on the inside of the building, an operation of inserting a new exhaust tube into the already-placed exhaust pipe; performing, on the outside of the building, an operation of fixing the inserted exhaust tube to the exhaust pipe; and performing, on the inside of the building, an operation of connecting the fixed exhaust tube to an exhaust vent of a combustion apparatus. | 03-03-2016 |
20160059406 | CUTTING GUIDE AND METHOD OF INSTALLING EXHAUST TUBE - A cutting guide serves to adjust a length of an exhaust tube introduced in an exhaust pipe so as to adapt to combination of the exhaust pipe communicating from the inside to the outside of a building with an exhaust terminal attached to an end portion of the exhaust pipe on an outdoor side. The cutting guide has a reference site for alignment with an exhaust pipe portion including the exhaust pipe, and has an indication of a cutting position of the exhaust tube for adjusting a length of the exhaust tube protruding from the end portion of the exhaust pipe portion on the outdoor side to a length adapted to a type of the exhaust terminal. | 03-03-2016 |
20160053997 | EXHAUST STRUCTURE FOR WATER HEATER - A water heater heats water with a combustion gas. An exhaust tube includes one end portion and the other end portion, is connected to the water heater at one end portion, and inside thereof is defined as an emission path for the combustion gas. An exhaust pipe is greater in outer diameter than the exhaust tube, and a part of the exhaust tube on a side of the other end portion is introduced in the inside thereof. An exhaust terminal is attached to an end portion of the exhaust pipe and has an exhaust port for exhausting the combustion gas to the outside. An exhaust straightening member is attached to the other end portion of the exhaust tube and has an opening portion for allowing the combustion gas to flow out toward the exhaust port. | 02-25-2016 |
20160053995 | METHOD OF INSTALLING EXHAUST TUBE - A method of installing an exhaust tube is implemented by inserting an exhaust tube into an exhaust pipe that leads from inside of a building to outside thereof. A support portion of an insertion jig is introduced into a through hole from a side of one end portion of the exhaust tube, and a projection of the support portion is engaged with a recess of the exhaust tube, so that the insertion jig is fixed to the exhaust tube. An end of the exhaust tube on the side of the one end portion having the insertion jig fixed thereto is inserted into the exhaust pipe, and the exhaust tube is pushed from inside of the building to outside thereof. | 02-25-2016 |
20160053994 | EXHAUST STRUCTURE FOR COMBUSTION APPARATUS - An exhaust structure for a combustion apparatus includes a combustion apparatus, an exhaust tube, an exhaust pipe, an exhaust adapter, and a fixing member. The exhaust tube is connected to the combustion apparatus at the one end portion. A part of the exhaust tube on a side of the other end portion is inserted into the exhaust pipe. The exhaust adapter has an annular shape surrounding a through hole, and is attached to an outer circumferential surface of the exhaust tube and to an inner circumferential surface of the exhaust pipe by inserting the exhaust tube into the through hole. The fixing member is formed of an elastic body, attached to the exhaust pipe at a position close to the combustion apparatus relative to the exhaust adapter, and fixes the exhaust tube to the exhaust pipe while being attached to the outer circumferential surface of the exhaust tube. | 02-25-2016 |
20160025377 | Water Heater - A water heater is provided that can suppress backflow (entry) of drainage water into a fan from downstream of the fan in a path of a flow of combustion gas. The fan includes a fan case, an impeller housed within the fan case, a drive source attached to the fan case so as to drive the impeller, and a rotation shaft connecting the impeller and the drive source. An exhaust connection portion has a connection portion case and is provided with an exhaust port for emitting combustion gas delivered from the fan to outside of the water heater. The exhaust connection portion also has a drainage water discharge portion for discharging drainage water accumulated downstream of the fan in the path of the flow of combustion gas. | 01-28-2016 |
20160025376 | WATER HEATER - A water heater includes a burner generating combustion gas, a heat exchanger heating water which flows through the inside, through heat exchange with combustion gas generated in the burner, a fan supplying air to the burner, and a housing storing these components. The water heater has a water entry portion in a top plate of the housing. A water supply pipe for supplying water to the inside of the heat exchanger is connected to the water entry portion. The water entry portion is arranged to be included, in a plane view, in at least one component constituting the heat exchanger and an exhaust path for combustion gas which has passed through the heat exchanger. The component is made of a material having corrosion resistance against drainage water resulting from condensation of combustion gas. | 01-28-2016 |
20160025375 | WATER HEATER - A water heater of a latent heat recovery type adapted to an exhaust suction system includes a drainage water discharge path. The drainage water discharge path includes a drainage water tank having a water-seal mechanism, and the drainage water tank has a first chamber and a second chamber communicating with the first chamber through a hole. The second chamber is capable of storing drainage water up to a storage water plane located at a position higher than an upper end of the hole, and the first chamber senses a fluid level in the first chamber reaching a prescribed sensing plane. A height difference between the sensing plane in the first chamber and the storage water plane is greater than a height of a water head obtained by converting a difference between atmospheric pressure and a minimum pressure at the drainage water inlet to the water head. | 01-28-2016 |
20160025373 | WATER HEATER - A water heater includes a burner of a premixed type, a heat exchanger, and a fan suctioning combustion gas and exhausting combustion gas to the outside. The burner includes a burner case partitioned into a combustion chamber and a gas introduction chamber by a partition plate and a plurality of combustion tubes arranged in the combustion chamber. An air supply opening for supplying air into the gas introduction chamber is provided in the burner case. The partition plate has a plurality of opening portions communicating with the inside of the combustion tubes and a plurality of through holes communicating with the outside of the combustion tubes within the combustion chamber. The air supply opening is constructed to have an opening area smaller than the total sum of the total of opening areas of the plurality of opening portions and the total of opening areas of the plurality of through holes. | 01-28-2016 |
20160025338 | Exhaust Structure for Combustion Apparatus - An exhaust structure for combustion apparatus includes a combustion apparatus having a combustor unit, a blower unit and a housing, an exhaust tube connected to the combustion apparatus at one end, an exhaust pipe configured to allow a part of the exhaust pipe to be introduced therein from the other end, an exhaust adapter disposed between an inner circumferential surface of the exhaust pipe and an outer circumferential surface of the exhaust tube, a connection pipe configured to communicate a region between the inner circumferential surface of the exhaust pipe and the outer circumferential surface of the exhaust tube to an inner space of the combustion apparatus, and an exhaust member connected between the combustion apparatus and the one end of the exhaust tube. The housing of the combustion apparatus is provided with a connection member for connecting the connection pipe. | 01-28-2016 |
20150338130 | HOT WATER SUPPLY DEVICE - A hot water supply device | 11-26-2015 |
20150308323 | EXHAUST STRUCTURE FOR COMBUSTION APPARATUS AND CONSTRUCTION METHOD THEREOF - An exhaust tube includes one end portion and the other end portion and is connected at one end portion to a combustion apparatus, of which inside is defined as an exhaust passage for combustion gas. An exhaust pipe has an outer diameter greater than that of exhaust tube, into which a part of exhaust tube on a side of the other end portion is introduced. An exhaust adapter is attached between an outer circumferential surface of exhaust tube and an inner circumferential surface of exhaust pipe. On the side close to the other end portion in exhaust tube relative to exhaust adapter, an exhaust passage hole | 10-29-2015 |
20150241088 | FAN AND WATER HEATER PROVIDED WITH THE SAME, AND IMPELLER AND WATER HEATER PROVIDED WITH THE SAME - A fan includes: an impeller including a main plate having a first plane, a plurality of first blades each formed the first plane, and a shroud formed integrally with the plurality of first blades; a fan case; a drive source; and a rotation shaft. The first blades each include a linearly protruding region that is linearly increased in height from an outer circumferential side to an inner circumferential side, and a curvedly protruding region that is curvedly increased in height from the outer circumferential side to the inner circumferential side, the height extending in a direction in which each first blade protrudes. The linearly protruding region is welded to the main plate. Accordingly, a highly durable fan can be implemented that allows sufficient durability to be maintained even under a high temperature environment or an acid environment. | 08-27-2015 |
20150241086 | WATER HEATER - A water heater capable of cooling a fan by inflow of air while suppressing backflow of combustion gas is provided. A fan includes: a fan case having a back surface wall; an impeller having a first blade and a second blade and housed in the fan case; a drive source rotating the impeller; and a rotation shaft coupling the impeller and the drive source through a through hole provided in the back surface wall. A gap through which air outside the fan case is suctioned into the fan case is provided between the rotation shaft and the back surface wall. The second blade faces the back surface wall without another member interposed therebeween throughout a range from an inner circumferential side to an outer circumferential side of the second plane. | 08-27-2015 |
20150176912 | HEAT EXCHANGER AND PRODUCTION METHOD THEREOF - The heat exchanger wherein each end of a plurality of heat transfer tubes is connected to an end wall of a bulging portion provided at a side wall of a case, an open edge of a header is fitted onto the bulging portion, and a chamber connecting with each heat transfer tube is formed. For jointing the header to the side wall, an inner circumferential end of the open edge of the header is formed as a first curved surface with a convex section, an outer face of the circumferential wall of the bulging portion is formed as a second curved surface with a concave section, the first curved surface and the second curved surface contact each other, and the surface-contact portion and the area therearound are welded. The number of the members is reduced, the structure is simplified, and the production cost of the heat exchanger is reduced. | 06-25-2015 |
20150176862 | WATER HEATER - A fan serves to suction combustion gas which has passed through a secondary heat exchanger and emitting combustion gas to the outside of a water heater. A drainage water discharge pipe is connected to the secondary heat exchanger in order to discharge the drainage water produced as a result of recovery of latent heat in the secondary heat exchanger to the outside of the secondary heat exchanger. An air passage pipe is connected to an exhaust box. A Y-shaped pipe joint has a flow path allowing merging of the drainage water discharge pipe and the air passage pipe, and the flow path after merging leads to the outside of the water heater. | 06-25-2015 |
20150176861 | WATER HEATER - A water heater of a latent heat recovery type includes: a combustion apparatus including a burner having a plurality of burner port portions and generating combustion gas from openings at ends of the plurality of burner port portions; a heat exchanger heating water that flows through inside by heat exchange with combustion gas generated in the combustion apparatus; and a fan suctioning the combustion gas that has passed through the heat exchanger and emitting combustion gas to outside of the water heater. The fan includes a fan case, an impeller housed within the fan case, and a drive source connected to the impeller. At least a part of an upper surface of a bottom wall of the fan case is inclined with respect to a reference plane including the openings of the plurality of burner port portions. | 06-25-2015 |
20150144074 | WATER HEATING APPARATUS - A water heating apparatus includes a burner, a heat exchanger for heating hot and cold water with use of heat from the burner, a scale detector for detecting occurrence of scale clogging in the heat exchanger, a notifying unit for notifying an error when the scale detector detects occurrence of a scale greater than or equal to a predetermined amount, and a controller performing a control of allowing the notifying unit to notify an error and prohibiting combustion operation of the burner when the scale detector detects occurrence of a scale greater than or equal to the predetermined amount. The controller is configured to start a cleaning mode for cleaning inside the heat exchanger when the controller detects shifting operation to the cleaning mode after the combustion operation of the burner is prohibited. | 05-28-2015 |
20150056903 | EXHAUST ADAPTER, EXHAUST STRUCTURE FOR WATER HEATER, AND METHOD FOR INSTALLING EXHAUST ADAPTER - An exhaust adapter secures an exhaust tube relative to an exhaust pipe. The exhaust adapter is formed to have an annular shape enclosing a through hole, and is mounted on the outer peripheral surface of the exhaust tube and on the inner peripheral surface of the exhaust pipe by inserting the exhaust tube into the through hole. When the exhaust adapter is being fitted on the outer peripheral surface of the exhaust tube, the inner peripheral surface of the exhaust adapter presses the outer peripheral surface of the exhaust tube, and when the exhaust adapter is being fitted on the inner peripheral surface of the exhaust pipe, the outer peripheral surface of the exhaust adapter presses the inner peripheral surface of the exhaust pipe. | 02-26-2015 |
20140345542 | EXHAUST CASE AND COMBUSTION APPARATUS PROVIDED WITH THE SAME - An exhaust case having the first exhaust gas flow path for flowing combustion exhaust gas passing upward through a heat exchange, behind a water-shielding plate and for guiding the combustion exhaust gas onto the water-shielding plate toward an exhaust vent, and having the second exhaust gas flow path for flowing a part of combustion exhaust gas into a space between the water-shielding plate and a horizontal plate part and further into the exhaust vent. A ventilation hole is provided for an upright plate part extending from the rear end of the horizontal plate part in order to flow combustion exhaust gas into the space, and is provided in the substantially horizontal direction. Accordingly, the exhaust case is inhibited to become large scaled, and a superior exhaust noise-reduction effect, a suppression effect of combustion oscillation of the burner, and a waterproof performance are able to be achieved. | 11-27-2014 |
20140202680 | HOT WATER SUPPLY APPARATUS AND CONTROL METHOD THEREOF - A conversion factor learning unit successively updates a temperature conversion factor by learning a performance ratio of an output heat quantity with respect to an input scale number corresponding to a requested heat quantity generation to a hot water supply apparatus. The temperature conversion factor learned by the conversion factor learning unit is reflected in arithmetic operation of an FF scale number by a feedforward control unit and arithmetic operation of the FB scale number by the feedback control unit. An integral control in the feedback control unit is preferably turned off. | 07-24-2014 |
20140202679 | HOT WATER SUPPLY APPARATUS AND CONTROL METHOD THEREOF - By a feedback arithmetic operation based on a temperature deviation, an input number is set which corresponds to a requested heat quantity generation, which is a controlled object, to a hot water supply apparatus. The temperature deviation is calculated by correcting a deviation of a tapping temperature with respect to a set hot water temperature with use of a Smith compensation temperature calculated by a Smith compensator for predicting a variation in a tapping temperature prior to an elapse of a dead time corresponding to a detection lag of the tapping temperature. The Smith compensator calculates a Smith compensation temperature to be used in the next control cycle based on the input scale number, the present Smith compensation temperature, and a time constant set in accordance with a flow rate of the hot water supply apparatus. | 07-24-2014 |
20140190425 | HEAT EXCHANGER AND WATER HEATER - A fin includes a cut and raised slit and a cut and raised wall portion. The cut and raised slit is formed in a region adjacent to at least one through hole of a plurality of through holes in a first direction and has a tunnel-shaped hole extending in a second direction intersecting the first direction. The cut and raised wall portion is located in the second direction of the cut and raised slit, protrudes toward a main surface of the fin, and extends along the first direction. Thus, a heat exchanger and a water heater capable of sufficiently conducting an amount of heat of a combustion gas to a heat conduction pipe even in a blind spot of a flow of the combustion gas of the heat conduction pipe and suppressing noise can be realized. | 07-10-2014 |
20140174382 | HEAT EXCHANGER AND WATER HEATER INCLUDING THE SAME - In a primary heat exchanger, a heat conduction pipe is arranged as one connected pipe in a lower stage and an upper stage in a manner extending back and forth through a plurality of fins. The heat conduction pipe is arranged such that a pitch between the heat conduction pipes in the upper stage is shorter than a pitch between the heat conduction pipes in the lower stage. In addition, the heat conduction pipe is arranged such that a position in a center of each heat conduction pipe in the upper stage in a second direction orthogonal to a first direction in which the heat conduction pipe extends and a position in a center of each heat conduction pipe in the lower stage in the second direction are displaced from each other. | 06-26-2014 |
20140116357 | CONTROL APPARATUS FOR WATER HEATER - The present invention becomes possible to employ a main microprocessor with a relatively lower number of input ports, whereby while maintaining the performance and function of a water heater, the cost of a control apparatus is cut down. Some of sensors, adapted for measurement of various parameters which are for use in operational control of the water heater and in need of immediate response, are connected to a main microprocessor | 05-01-2014 |
20130171576 | RICH-LEAN COMBUSTION BURNER AND COMBUSTION APPARATUS - There is provided a flame hole formation member | 07-04-2013 |
20130149653 | RICH-LEAN COMBUSTION BURNER AND COMBUSTION APPARATUS - In a rich-lean combustion burner, each of outer rich-side flame holes disposed on both outer sides is supplied with rich-side mixture in the same amount and mixing state as the others. A lower end part of a central rich-side burner part is projected into an interior of a tubular part to which a rich-side mixture is introduced. First communication holes are opened, respectively, in both side walls of the lower end part. A second and a third communication holes in fluid communication with an outer rich-side burner part are opened in a tubular part. The second and the third communication holes are oriented so as to face each other without any obstruction, other than a space, therebetween. Furthermore, a pocket part which is a space part adapted to collect and accumulate dust particles is formed on the downstream side up to a closed end. | 06-13-2013 |
20130081727 | VALVE APPARATUS AND WATER HEATING APPARATUS - A shaft body ( | 04-04-2013 |
20130061821 | COMBUSTION APPARATUS - An exhaust channel of a combustion apparatus is defined by an upper sloping plate and a lower sloping plate. The lower sloping plate contains a rising part and a lower sloping wall. A water droplet baffle plate is positioned across an interspace from the rising part. The interspace is brought into fluid communication with the exhaust channel through an upper surface opening while being brought into fluid communication with a bottom of a heat exchange chamber through a communication opening. A collision wall part of the water droplet baffle plate is disposed in close proximity to a lowest fine tube so as to oppose against a combustion exhaust flow. Water droplets adhere onto the collision wall part. Water droplets failing to adhere to the collision wall part fall through the upper surface opening positioned over an upper end of the collision wall part. | 03-14-2013 |
20130025546 | COMBUSTION APPARATUS - According to the required amount of heating, a controller of a combustion apparatus exercises selective on-off switching control on capacity control switching valves for the supplying of gas to three different combustion areas partitioned respectively by a group of three combustion burners, a group of five combustion burners and a group of nine combustion burners, whereby the three combustion areas can selectively be burned, thereby the combustion capacity is changed and switched to any of a plurality of combustion capacity levels. A combustion exhaust temperature sensor is disposed in the vicinity of the inlet of an exhaust stack. Judgment temperatures corresponding respectively to combustion capacity levels for combustion exhaust high-temperature abnormality judgment are set. If the detected combustion exhaust temperature exceeds the judgment temperature corresponding to a current combustion capacity level, this provides a notification indicative of the occurrence of an abnormality while combustion is forcibly stopped. | 01-31-2013 |
20120308945 | RICH-LEAN COMBUSTION BURNER - A rich-lean combustion burner has a supply channel through which a lean-side mixture is supplied to lean-side flame holes; and a supply channel through which a rich-side mixture is supplied to rich-side flame holes. The supply channels are partitioned from each other. A third plate member including a pair of plate parts which are bent to form a V shape at its lower end edge as a fold line is employed to form a central rich-side burner part. A slit part is partitioned and formed between side edges of a pair of first plate members on both longitudinal sides for forming lean-side flame holes on width-wise sides of the central rich-side burner part. With the lower end part in front, the V-shaped third plate members inserted into the slit part, thereby being interposed between the first plate members. | 12-06-2012 |
20120272928 | EXHAUST ADAPTER AND COMBUSTION APPARATUS HAVING THE SAME - An exhaust adapter A having an inner tubular wall | 11-01-2012 |
20120219920 | RICH-LEAN COMBUSTION BURNER - A row of rich-side flame holes of a combustion burner is arranged in center. Two rows of lean-side flame holes are arranged respectively on sides of the rich-side flame hole row. Two rows of rich-side flame holes are arranged respectively on the outsides of the two lean-side flame hole rows. Supply of lean-side mixture is provided to the lean-side flame hole rows from a tubular part. A lower end part of a central rich-side burner part is projected into a tubular part, into which the rich-side mixture is introduced, to establish lateral fluid communication, with its lower end edge placed in a state of non-contact with the inner surface of the tubular part. First communication holes in fluid communication with an internal space are opened in the lower end part. Communication holes in fluid communication with the outer rich-side flame holes are opened in the inside of the tubular part. | 08-30-2012 |
20120156629 | RICH-LEAN COMBUSTION BURNER - A row of rich-side flame holes is centrally arranged. Two rows of lean-side flame holes are arranged on both sides of the rich-side flame hole row, respectively. In addition, two rows of rich-side flame holes are arranged on the outsides of the two lean-side flame hole rows, respectively. A lower end part of a central rich-side burner part is projected into a tubular part into which the rich-side mixture is introduced, and communication holes in fluid communication with an inner space are formed in walls on both sides so as to pass completely therethrough in alignment with each other. Each communication hole has a larger diameter than an inner width P and is disposed at a portion situated nearer to the upper of the tubular part and nearer to the front so as to leave, at the rear, a space in which dust p particles are accumulated. | 06-21-2012 |
20110259317 | Hot water supply apparatus - According to the hot water supply apparatus of the present invention, it becomes possible to effectively prevent the dew condensation on a bypass line. While exhaust gas after passage through a heat exchanger | 10-27-2011 |
20110183277 | Driving method for solenoid valve, solenoid valve driving apparatus, and combustion apparatus including same - A solenoid valve driving apparatus includes switching means for ON/OFF-controlling application of a direct current voltage to a solenoid of a solenoid valve, and signal outputting means. A first period and a consecutive second period are set as a valve opening operation period of the solenoid valve. When the signal outputting means outputs the PWM signal to the switching means, a duty ratio of the output signal is set to be higher in the second period than in the first period so that a power supplied to the solenoid is larger in the second period than in the first period. As a result, a valve opening operation is performed in the solenoid valve reliably, and loud noise generation during the valve opening operation is suppressed. | 07-28-2011 |
20110155079 | Heat exchanger and water heater incorporating the same - A heat exchanger A | 06-30-2011 |
20100330520 | Combustion apparatus - A combustion apparatus mainly consists of burners, a fuel supply channel having branched channels, an air feeder for supplying air to the burners, and a pressure regulator and has a combustion space. The branched channels allow fuel gas supplied to the burners to pass therethrough and are provided with shutoff valves. The pressure regulator includes a signal-pressure inlet and a secondary-pressure inlet. A signal pressure introduced through the signal-pressure inlet is detected at a downstream of the air feeder and a secondary pressure introduced through the secondary-pressure inlet is detected at a vicinity of a boundary of the branched channels in the fuel supply channel. Fuel gas discharged from the pressure regulator is regulated so as to satisfy a predetermined relationship between the signal pressure introduced through the signal-pressure inlet and the secondary pressure introduced through the secondary-pressure inlet. | 12-30-2010 |
20100200769 | DRINKING WATER SERVER - The invention presents a drinking water server having a configuration capable of suppressing generation of bacteria in a cold water tank, in a cold water pour tube, and in a pour valve. | 08-12-2010 |
20100126431 | COMBUSTION APPARATUS - A combustion apparatus | 05-27-2010 |
20090133642 | Latent heat recovery-type water heater - So as to provide a latent heat recovery-type water heater capable of certainly preventing drain generated by heat exchange from being discharged out of an exhaust portion through an outlet with entrained by a flow of combustion gas, an exhaust portion | 05-28-2009 |
20090064945 | HEAT EXCHANGER, WATER HEATER AND WATER TUBE - A water tube WT of a heat exchanger B includes a helical tube body | 03-12-2009 |