Please select the most similar patent number from A, B, C and D. Which number is?
Provided in the present invention is a refrigerator, comprising a housing. An accommodating area is provided in the housing. A lining of the refrigerator is provided in the accommodating area. A foamed air supply pipe is provided between the lining and the housing. An air chamber is provided in the foamed air supply pipe. Between an air inlet and an air outlet of the air chamber, the air chamber wall of the air chamber is provided as an arc in the direction of airflow, thus ensuring the efficiency of air supply. An overflow groove is provided on the outer surface of the foamed air supply pipe facing the lining. Foam is filled between the overflow groove and the lining. The overflow groove is capable of accommodating some of the foam squeezing against the foamed air supply pipe, thus allowing the foamed air supply pipe to be connected to the lining via the foam, preventing adhesion, increasing production efficiency, and reducing to a certain extent the squeezing of the foam against the foamed air supply pipe. At the same time, because the pipe wall of the foamed air supply pipe is flexible, the air chamber in the air supply pipe is not affected by the foam squeezing against the foamed air supply pipe, thus reducing quality risks.
A: Disclosed is a refrigerator capable of returning air from a side part of a cabinet thereof, the refrigerator comprising a bottom liner, a plurality of upper liners and two side wall return-air channels, wherein the bottom part of the bottom liner is provided with a cooling chamber, side walls of two sides of the cooling chamber are respectively provided with a side return-air opening, the plurality of upper liners are arranged above the bottom liner in sequence, the front parts of side walls of two sides of each upper liner are respectively provided with an air discharge opening, the two side wall return-air channels are respectively positioned at an outer part of the bottom liner and an outer part of a side wall of one side of the plurality of upper liners, each side wall return-air channel is provided with a connection opening, the lower end of each side wall return-air channel is connected to the side return-air opening, such that return airflows of the plurality of upper liners are introduced into the cooling chamber. In the refrigerator, return airflows of a refrigerating chamber and a variable-temperature chamber can all be led into the cooling chamber, and an independent air supply system of the refrigerating chamber is eliminated, such that the production costs of the refrigerator is reduced; and the side wall return-air channels are rationally arranged, such that the cabinet of the refrigerator is more stable and aesthetic.
B: A fresh air indoor air conditioner unit (10) comprises a housing (100) and a fresh air device (200). The fresh air device (200) comprises an air inlet module (210) and a fan module (220) communicating with the air inlet module (210). An air inlet cavity is defined in the air inlet module (210), and a pipeline connection portion (212) communicating with the air inlet cavity (211) is provided. The pipeline connection portion (212) is connected to an outdoor fresh air inlet tube (213). The fan module (220) comprises a centrifugal fan (221) and a volute (222) provided outside the centrifugal fan (221). An air inlet of the volute (222) communicates with the air inlet cavity (211), and an air outlet (223) of the volute (222) faces a top portion of the housing (100). An air supply fan (400) is configured to intake, at an air inlet (110) at the top portion of the housing (100), at least some of the air discharged by the centrifugal fan (221), and the air exchanges heat with a heat exchanger (300), and is then discharged via an air supply outlet (120) at a lower portion of the housing (100).
C: A laundry device, comprising a barrel assembly, a valve assembly (5), and a fan (6), wherein the valve assembly comprises a blocking mechanism and a valve housing (51) which has an air intake cavity (511) and an air outlet cavity (512), the air intake cavity and the air outlet cavity are arranged independent of each other, the air intake cavity communicates with air intake pipelines (7, 8) that connect the outside with the barrel assembly, the air outlet cavity communicates with air outlet pipelines (9, 10) that connect the outside with the barrel assembly, the fan is provided on the air intake pipelines and/or the air outlet pipelines, and the blocking mechanism is arranged to be able to simultaneously block the air intake pipelines and the air outlet pipelines. Further relating to a valve assembly. According to the laundry device and the valve assembly, the air intake pipelines and the air outlet pipelines can be blocked at the same time, so that the dual blocking effects of blocking the entry of external dust and preventing foam overflow can be achieved. The structure is simple, the overall structure arrangement of products is facilitated, and the design complexity is reduced.
D: A textile air duct capable of increasing air supply efficiency, comprising: an air blower, an air inflation pump, an air duct body and a fixing rod; the air blower is provided with an air outlet pipe, the air duct body is provided with a connecting pipe, the air inflation pump is provided with an air inflation pipe, and the air inflation pipe is fitted with an air nozzle; the lower end of each suspension rod is rotatably provided with a locking hook, the air duct body is provided with support straps, and the air duct body is connected to the locking hooks by means of the support straps; the air duct body comprises a textile fabric layer, a first pressure-resistant layer, an air inflation layer, a second pressure-resistant layer and a thermal insulation layer, and a ventilation cavity is further provided inside the air duct body; the thermal insulation layer is the innermost layer, the second pressure-resistant layer has one side connected to the thermal insulation layer and the other side connected to the air inflation layer, the side of the air inflation layer away from the second pressure-resistant layer is connected to the first pressure-resistant layer, the other side of the first pressure-resistant layer is connected to the textile fabric layer, and the textile fabric layer is the outermost layer. In the present utility model, the textile air duct does not collapse while ensuring the softness of the textile air duct, has a high air supply efficiency and a simple structure, is convenient to assemble, disassemble and clean, and is very convenient to use.
Answer: A