A muffler comprises a housing enclosed to form a hollow cavity, the cavity comprises a cylindrical chamber and a rectangular parallelepiped chamber, wherein one of bottom surfaces of the cylindrical chamber is connected with a first surface of the rectangular parallelepiped chamber, the cylindrical chamber communicates with an interior of the rectangular parallelepiped chamber, and the cylindrical chamber is provided with an air inlet and an air outlet.

A refrigerator includes a noise reduction device and a machine room that accommodates a condenser and a compressor. The noise reduction device includes a sensing unit configured to measure noise generated from the machine room of the refrigerator and a generating unit configured to output a sound signal having a frequency canceling or reducing the noise. The machine room is defined by a case that has a communication portion configured to communicate a fluid between an inside of the case and an outside of the case to thereby exchange heat between the fluid and the condenser and between the fluid and the compressor.

A vacuum assembly for a refrigerator includes upper and lower sealing bodies, which are buckled to define a sealed cavity. A vacuum pump is provided in the cavity. A plurality of sheet members are arranged between the vacuum pump and a sealing box. A plurality of abutting parts are provided on the upper sealing body and abutting against tops of the sheet members. A step is provided at an end of the abutting part coming into contact with the sheet member. A top surface of the step abuts against the sheet member, and a side surface of the step abuts against the sheet member. A plurality of ribs are provided on the lower sealing body and spaced apart from the side walls to define limiting grooves. A plurality of guide grooves are provided on the lower sealing body and extend in a vertical direction to guide the sheet members.

Provided is a refrigerator (10), including: a cabinet (100) in which a cooling chamber (200) located at a lower side and at least one storage compartment located above the cooling chamber (200) are defined, a bottom air inlet (110a) and a bottom air outlet (110b) being provided in a bottom of the cabinet (100) in a transverse direction at an interval; a compressor chamber (300) arranged behind the cooling chamber (200), in which a compressor (104), a heat dissipation fan (106) and a condenser (105) are sequentially arranged; and a divider (117) configured to completely isolate the bottom air inlet (110a) from the bottom air outlet (110b), such that external air entering the condenser (105) and heat dissipation air discharged from the compressor (104) are not crossed. In the refrigerator (10), the freezing chamber (132) is raised, a user has no need to bend down much to access to the freezing chamber (132), and the use experience is improved. In addition, by the divider (117), the bottom air inlet (110a) and the bottom air outlet (110b) are completely separated, so that the external air entering the condenser (105) and the heat dissipation air discharged from the compressor (104) are not crossed.

A refrigerator has a component subassembly incorporating a plurality of refrigeration components along an airflow path that extends between an inlet for colder air and an outlet for warmer air. The refrigerator further includes a noise reduction arrangement for reducing an operating noise of the refrigerator having a plurality of walls defining the airflow path. The walls include a noise absorbing material. The plurality of walls includes a plurality of external walls and a plurality of internal walls. The plurality of external walls defines an outer perimeter of the component subassembly and are oriented generally orthogonal to one another. The internal walls of the plurality of internal walls may be skewed relative to the external walls of the plurality of external walls. At least some of the walls of the plurality walls may be load-bearing walls.

A sound-insulating refrigerator vacuum assembly, comprising a sealed box receiving a vacuum pump, the sealed box body comprises an upper sealing body and a lower sealing body, the upper sealing body and the lower sealing body can be snap-fitted to define a receiving cavity, and the vacuum pump is placed in the receiving cavity; the vacuum assembly further comprises an air pipe member, the air pipe member comprises an air inlet pipe, an air outlet pipe and a base plate that are integrally formed, and the air inlet pipe and the air outlet pipe are disposed through the base plate; a notch portion is provided in the sealed box, and an outer edge of the base plate matches the notch portion in shape; the vacuum pump is connected with a muffler.

Disclosed is an oxygen-control freshness preservation refrigerator, comprising a cabinet with a refrigerating compartment and a freezing compartment. A partition plate for separating the refrigerating compartment from the freezing compartment is arranged in the cabinet. The refrigerator further has a freshness preservation compartment arranged inside the refrigerating compartment and an oxygen control device for reducing the oxygen content inside the freshness preservation compartment, the oxygen control device comprises a gas-regulating membrane assembly and a gas extraction assembly. The gas-regulating membrane assembly has at least one gas-regulating membrane for selective gas permeation. The gas extraction assembly has a gas extraction pump arranged in the partition plate; and the gas extraction pump is provided with a gas intake pipe in communication with a gas discharge side of the gas-regulating membrane, and a gas discharge pipe for discharging gas from the gas discharge side of the gas-regulating membrane.

A refrigerator includes a noise reduction device. The noise reduction device measures noise generated from a machine room of the refrigerator and outputs a sound signal having a frequency canceling or reducing the noise.

An insulation structure for an appliance includes a cabinet having an outer wrapper and an inner liner, with an insulating cavity defined therebetween. Insulating powder material is disposed substantially throughout the insulating cavity. An insulating gas is disposed within the insulating cavity, wherein the insulating powder material is combined with the insulating gas and cooperatively defines a suspended state and a precipitated state. The suspended state is defined by the insulating gas in motion and the insulating powder being in an aeolian suspension within the insulating gas while in motion. The precipitated state is defined by the insulating gas being in a deposition state and the insulating powder being precipitated from the insulating gas and deposited within the insulating cavity.

A muffler comprises a housing enclosed to form a hollow cavity, the cavity comprises a cylindrical chamber and a rectangular parallelepiped chamber, wherein one of bottom surfaces of the cylindrical chamber is connected with a first surface of the rectangular parallelepiped chamber, the cylindrical chamber communicates with an interior of the rectangular parallelepiped chamber, and the cylindrical chamber is provided with an air inlet and an air outlet.