Please select the most similar patent number from A, B, C and D. Which number is?
A steam boiler and a steam car washer comprising same. The steam boiler comprises: a combustion boiler (10) provided with a heating component (20) so as to allow the water flow to flow to the heating component (20) for heating; a water storage cavity (30) provided at an outer side of the combustion boiler (10) and communicated with the heating component (20) so as to allow the water to flow through the water storage cavity (30) and then flow to the heating component (20) for heating and to spill the water vapor generated by heating the water flow into the water storage cavity (30); and a descaling device (40) mounted outside the combustion boiler (10) and communicated with the water storage cavity (30) so as to transport a descaling agent in the descaling device (40) into the water storage cavity (30) and the heating component (20) to remove the limescale therein, thereby solving the problem in the prior art of the low limescale washing efficiency in the steam boiler.
A: A point-contact disinfecting and itch-relieving heat application device, comprising a housing (1), a heating device, and a water outlet portion (3). The housing (1) has an internal water storage chamber (11), and the heating device is used to heat a liquid in the water storage chamber (11). The water outlet portion (3) is disposed at a front end of the housing (1), the water storage chamber (11) is located at the front of the housing (1), and the water storage chamber (11) is in communication with the water outlet portion (3) through a water pipe (12). The housing (1) is provided with a control valve (4) for controlling the water storage chamber (11) to be in communication with or isolated from outside air. The heat application device has the advantages of shortening a water flow path, making it easier to control outlet water temperature, and allowing timely water discharge and discharge termination.
B: A heat transfer spoiler (60), a volumetric heat transfer device (100), and a water heater, the volumetric heat transfer device (100) comprising: a burner housing (20), having a burning cavity (202) with an open upper end; a burner (30), provided within the burning cavity (202); a liner (10) provided on the upper end of the burner housing (20) and having a water storage cavity (101) therein, the water storage cavity (101) having an upper opening (105) and a lower opening (106), and the side wall of the liner (10) being provided with a heat transfer passage (103) in communication with the burning cavity (202); and a main heat transfer tube (44), provided within the water storage cavity (101), and the upper end and the lower end thereof being sealingly provided within the upper opening (105) and the lower opening (106) respectively.
C: A urea production apparatus comprises a cabinet (10), an agitation tank (20), a filter portion (30), a water tank portion (40) and a heater portion (50). The agitation tank (20) and the filter portion (30) are disposed within the cabinet (10), and an inlet of the water tank portion (40) is in communication with an outlet of the filter portion (30); the heater portion (50) is disposed within the cabinet (10) and is in communication with an outlet of the water tank portion (40), and an outlet of the heater portion (50) is in communication with the agitation tank (20). The present invention adopts a separate heater portion (50) to heat the water in the water tank portion (40), and then transports the water heated by the heater portion (50) into the agitation tank (20) to produce urea; this configuration enables the heater portion (50) to heat the water in the water tank portion (40) timely, thus effectively increasing the efficiency of the urea production apparatus and satisfying the user needs.
D: A steam generating device and a clothes care machine. The steam generating device comprises a boiler body (12), a heating device (13) and a scale collecting device (14); the boiler body (12) is provided with a water inlet (121), a steam outlet (122) and a scale collecting opening (123), and the setting height of the scale collecting opening (123) is not higher than a preset water level in the boiler body (12); the scale collecting device (14) comprises a scale collecting cavity (141), the scale collecting cavity (141) communicates with the scale collecting opening (123), and a scale filter screen (142) is arranged at the communication position of the scale collecting opening (123). Since the scale filter screen (142) is a porous structure, same more easily absorbs scales, and the scales are gathered in the scale filter screen and are agitated by a water flow in the boiler body (12). The scales which are gathered to form larger particles may enter the scale collecting cavity (141) by means of the scale filter screen (142), thereby effectively solving the problems of uneven heating and potential safety hazards caused by scales easily accumulating on the surface of the inner side of the boiler body (12).
Answer: D