Abstract: The object is to provide a burner capable of taking in sufficient primary air even though the size thereof is compact, and capable of being used as an all-primary air burner. A burner includes a mixing pipe to which a fuel gas and combustion air are supplied, a burner main body having a mixing chamber at a top end on a downstream side of the mixing pipe, and a burner head which is provided at an upper part of the burner main body while communicating with the mixing chamber and has first and second burner ports for ejecting mixed gas of the fuel gas and air for combustion mixed in the mixing chamber. The burner further includes an extension pipe in the burner main body protruding inside the mixing chamber being formed by extending the mixing pipe.

Abstract: A water heater capable of suppressing an increase in the combustion air temperature exiting the heater and the generation of nitrogen oxide within an easy structure is provided. In the water heater, a burner is provided in a combustion chamber which is below a hot water storage chamber that is an all primary air burner which takes in the air required for gas combustion, whereby the air is mostly primary air. In addition, the burner is provided with a supporting plate in the combustion chamber at a height that allows part of the burner head to be protruded into a space covered by a lower mirror plate.

Abstract: A water heating apparatus includes: an exhaust gas passage through which an exhaust gas from a burner flows; a water flow passage through which water flows; a first heat exchanger configured to exchange heat between sensible heat contained in the exhaust gas and water flowing through a heat exchanger tube, and arranged at upstream side of the exhaust gas passage and downstream side of the water flow passage; a second heat exchanger configured to exchange heat between latent heat contained in the exhaust gas and water flowing through a heat exchanger tube, and arranged at downstream side of the exhaust gas passage and upstream side of the water flow passage; and a bypass pipe arranged in the water flow passage in such a position as to bypass the second heat exchanger and designed to allow a at least the predetermined minimum amount of water required for a burner combustion operation to flow therethrough into the first heat exchanger.

Abstract: A fryer is provided where an oil fire caused by overheating is accurately and rapidly extinguished and the oil can then be reused after extinguishing the fire. A housing includes a slide cover capable of sliding between a housing position and a shielding position, wherein the housing position is to open an upper face of an oil vat and the slide cover is housed on the side of the housing, and the shielding position is to close the upper face of the oil vat. When oil catches fire due to overheating, the fire can be extinguished by closing the upper face of the oil vat with the slide cover.

Abstract: A cooking stove in which heat exchange between combustion gas and the bottom surface of a cooking container is sufficiently conducted and heat exchange efficiency is improved is provided. On a top plate, a plate that supports a cooking container is arranged concentrically with the burner head of the burner viewed from above. This plate is disc-shaped where an opening which is larger than the burner head is defined at the center. Moreover, eight protrusions having an angular cross section where slopes become gentler as they extend toward the outer circumferential side are spirally arranged around the opening viewed from above, and these protrusions are formed by press forming.

Abstract: The present invention provides a hot water supply system using at least two water heaters having versatility to realize switching between a single hot water supply operation mode and a connected hot water supply operation mode of the water heaters and connected operation control after switching to the connected hot water supply operation mode with a simple configuration. Two water heaters D1, D2 each includes a dip switch operated when setting the connected hot water supply operation mode of the two water heaters. When each dip switch is in the ON state to set the connected hot water supply operation mode, hot water supply control by the connected operation is performed under the mutual communication via a communication cable L in the two water heaters D1, D2.

Abstract: A fryer is set up in a cooking area of a restaurant or the like for use, and allows a standby temperature of cooking oil to be switched according to congestion of customers in a hall of the restaurant. The congestion of customers is evaluated by counting per unit time the count of an entrance switch when a customer enters the hall. When the count number per unit time is equal to or greater than a predetermined count, the oil temperature in a oil vessel of the fryer is set at a standby temperature T1 (degrees Celsius) allowing food materials to be quickly heated or fried. On the other hand, if the count is smaller than p1 times, the oil temperature is set at a standby temperature T2 (degrees Celsius) which is lower than the standby temperature T1 thereby conserving energy.

Abstract: According to a gas table 1, combustion gas (including the flame) is jetted from a flame port 17 of a burner 14 diagonally upward entirely twisted in the burner circumferential direction. The combustion gas flows into plural combustion gas routes sectioned into spiral shape, and hits trivet claws 22, and goes through. That is, the combustion gas is guided in spiral shape by the trivet claws 22, and exhausted along a cooking container P bottom surface toward the outer circumferential direction. As a result, in the combustion gas route, the combustion gas is always subject to direction changing force and the flow thereof is disturbed, and accordingly, a heat transmission border film is unlikely to be formed on the cooking container P bottom surface, and the heat of the combustion gas is transmitted to the bottom surface of the cooking container P preferably.

Abstract: At a time of starting of an operation, a controller determines whether the first operation was made after a power source being switched on in S1, and determines whether 5 minutes have passed after the previous operation in S2. When the first operation was not made or 5 minutes have lapsed after the last operation, the controller determines whether a difference between a detected temperature acquired by a thermistor and a preset temperature is more than 10° C. in S3. When a temperature difference is more than 10° C., a water flow rate servo is set at a position where a flow rate of flowing water is reduced from a determined flow rate by a predetermined amount in S4, and the controller performs a temperature control of discharged hot water in S8.

Abstract: In a non-operation state, a controller determines whether the first operation was made after a power source being switched on in S1, and determines whether 5 minutes has passed after finishing the last operation in S2. When the first operation was not made or 5 minutes have lapsed after the last operation, the controller determines whether a difference between a detected temperature acquired by a thermistor and a preset temperature is more than 10° C. in S3. When a temperature difference is more than 10° C., a water flow rate servo is made to stand by at a position with a flow rate of flowing water reduced to less than a determined flow rate by a predetermined amount in S4. When a hot water faucet is opened in this standing by state, a temperature control of discharged hot water at the time of starting of an operation (S8) is performed with the reduced flow rate of flowing water.

Abstract: A pulse burner includes: a combustion chamber provided in a liquid vat capable of storing liquid; a tail pipe that is connected to the combustion chamber and has a heat exchanging portion located in the liquid vat and bent in a predetermined shape; and a mixing chamber which communicates with the combustion chamber and to which fuel gas and combustion air is allowed to be supplied. When mixed gas including the fuel gas and the combustion gas is exploded and combusted, the combustion exhaust gas is exhausted through the tail pipe to allow heat exchange with the liquid, and the mixed gas is inhaled from the mixing chamber into the combustion chamber. At least the heat exchanging portion of the tail pipe is bent on a substantially horizontal plane.

Abstract: A fryer includes: a housing; an oil vat; a combusting and heating unit; an operational panel provided at a front face of the housing; and an exhaust pipe provided at a rear of the oil vat. A cooling path is defined at a rear of the operational panel in the housing. An external pipe is provided at a rear of the housing to surround the exhaust pipe and has an exhaust port of which the sectional opening area is narrowed at an upper end of the exhaust pipe. An air passage is defined by the housing and through which the cooling path and the external pipe are connected.

Abstract: It is provided a fryer where a fire caught in oil due to overheating is accurately and rapidly extinguished and the oil can be reused after extinguishing the fire. A housing 2 includes a slide cover capable of sliding between a housing position and a shielding position, wherein the housing position is to open an upper face of an oil vat 3 and the slide cover is housed on the side of the housing 2, and the shielding position is to close the upper face of the oil vat 3. When oil catches a fire due to overheating, the fire can be extinguished by closing the upper face of the oil vat 3 with a slide cover 20.

Abstract: The object is to provide a water heater capable of efficiently transmitting radiation heat of a burner to hot water in a hot water storage chamber, and improving thermal efficiency. In water heater, a second restriction part having a shallower depth than a restriction part is partially arranged along a peripheral edge of a lower mirror plate of a hot water storage chamber, a protrusion part protruding in a ring shape toward the center side of the lower mirror plate is arranged between the restriction part and the second restriction part, and a burner is provided so as to position a burner head of the burner to face the protrusion part.

Abstract: A burner including a burner main body having a mixing pipe to which a fuel gas and combustion air are supplied and a mixing chamber provided at a top end on the downstream side of the mixing pipe, and a burner head, which is provided at an upper part of the burner main body. The burner head communicates with the mixing chamber and ejects the mixed gas of the fuel gas and air mixed in the mixing chamber. The burner head has a cylindrical shape and is provided right above the mixing chamber of the burner main body. The burner head has several first and second burner ports bored around almost an entire periphery of a side face thereof. The mixing pipe extends in a direction where the mixing pipe is crossed with an axis line of the burner head at substantially right angles to each other.

Abstract: The object is to provide a burner capable of taking in sufficient primary air even though the size thereof is compact, and capable of being used as an all-primary air burner. A burner includes a mixing pipe to which a fuel gas and combustion air are supplied, a burner main body having a mixing chamber at a top end on a downstream side of the mixing pipe, and a burner head which is provided at an upper part of the burner main body while communicating with the mixing chamber and has first and second burner ports for ejecting mixed gas of the fuel gas and air for combustion mixed in the mixing chamber. The burner further includes an extension pipe in the burner main body protruding inside the mixing chamber being formed by extending the mixing pipe.

Abstract: To provide a water heater capable of suppressing an increase of combustion air temperature and suppressing to generate nitrogen oxide with an easy structure. In a water heater, a burner provided in a combustion chamber provided below a hot water storage chamber is an all primary air burner taking in air required for combustion, where the air is mostly primary air. Further, the burner is provided with a supporting plate in the combustion chamber at the height that a part of a burner head is protruded into a space covered by a lower mirror plate.

Abstract: A fryer in which solid oil for supplement and replacement is stocked with a reduced space and the solid oil is liquefied with a low cost is provided. In this fryer, a housing portion 23 for an oil can 25 having solid oil for supplement and replacement is provided at the bottom of a main body case 2 and a part of exhaust gas from a pulse burner 4 is guided into the housing portion 23, so that the oil can 25 is heated by exhaust heat of the exhaust gas. In addition, an oil supply hose 30 is connected between the oil can 25 and an inlet portion of a pump 20 to provide oil in the oil can 25 into an oil vat 3 with the pump 20.

Abstract: A hot water apparatus is provided in which heat recovery is performed as much as possible allowing condensate to be generated and excellent heat efficiency is achieved without providing a plurality of heat exchangers by effectively evaporating generated condensate. In a water heater 1, the condensate evaporator 11 is disposed inclining so that its side facing the high temperature portion of the heat exchanger 10 is at a lower position. The generated condensate drops on the condensate receiver guiding portion 28, and moves by its own weight to the side facing the high temperature portion. Then the condensate is heated and evaporated. In this evaporation, the same amount of heat as that of recovered latent heat is discharged to the exhaust gas, however, sensible heat can be recovered as much as possible without limiting condensate generation in the heat exchanger 10.

Abstract: A cooking stove in which heat exchange between combustion gas and the bottom surface of a cooking container is sufficiently conducted and heat exchange efficiency is improved is provided. On a top plate 2, a plate 7 that supports a cooking container P is arranged concentrically with the burner head 5 of the burner 4 viewed from above. This plate 7 is disc-shaped where an opening 8 which is larger than the burner head 5 is defined at the center. Moreover, eight protrusions 9, 9 . . . having an angular cross section where slopes become gentler as they extend toward the outer circumferential side are spirally arranged around the opening 8 viewed from above, and these protrusions 9 are formed by press forming.