Abstract: A central air-conditioning system, comprises a plurality of air-conditioning assemblies (1) and a plurality of range hood assemblies (2); each air-conditioning assembly (1) comprises a compressor (11), a first heat exchanger (12) and a second heat exchanger (13) which are connected with each other through refrigerating medium pipes (14); all the range hood assemblies (2) are in communication with the public flue (6); a third heat exchanger (3) and the second heat exchanger (13) is connected through a secondary refrigerant channel (4); each end of each secondary refrigerant channel (4) respectively exchanges heat with the second heat exchanger (13) and the third heat exchanger (3).

Abstract: A range hood, includes a fan system (2), the fan system (2) having a volute (21) and an impeller (22); the volute (21) includes a front cover (211), a rear cover (212) and an annular wall (213); the annular wall (213) has a volute tongue (214); the front cover (211) has an air inlet (215), the air inlet (215) faces downward to make the range hood to be a horizontal range hood; the volute tongue (214) is gradually inclined from the rear cover (212) to the front cover (211) in a direction opposite to the rotation direction of the impeller (22).

Abstract: The present invention discloses a control panel mechanism of a range hood. The control panel mechanism comprises a glass panel (1) and a control component (2), a plurality of mounting plates (4) each having two ends are disposed on the back of the glass panel (1), one end of each mounting plate (4) is connected to the control component (2) by a plurality of first fasteners (6); the mounting plates (4) are detachably connected to a front side plate (31) of a housing (2) of the range hood, and the mounting plates (4) is attached to a top plate (32) of the housing (2) by a second fastener (7). So that it is very convenient to assemble and disassemble the control component.

Abstract: A fan system is provided, which includes a volute having a front cover, a rear cover and an annular wall connected between the front cover and the rear cover; an impeller disposed inside the volute, and a motor; the front cover has an air inlet facing downward in the state when the fan system is mounted; the motor includes a motor body and an edge; the edge is connected to the rear cover at the side of the rear cover facing the air inlet. A range hood equipped with the fan system and a mounting method for a flow guide device of the range hood are provided.

Abstract: A kitchen air-conditioning system comprises a air-conditioning assembly and a range hood assembly; the air-conditioning assembly comprising a compressor, a first heat exchanger and a second heat exchanger which are connected with each other through a plurality of refrigerating medium pipes; and the air-conditioning assembly has a fresh air inlet and a fresh air outlet, the fresh air coming from the fresh air inlet is divided into two paths; the fresh air entering the first heat exchanger flows into the kitchen through the fresh air outlet, and the fresh air entering the air intake area cools the third heat exchanger in the range hood assembly and is then exhausted to the outside through the range hood, which is helpful to reduce the intake-air temperature of the second heat exchanger, thereby improving the energy efficiency of the air conditioner.

Abstract: A guiding mechanism, includes a guiding surface enclosed by a first curve segment, a second curve segment, a third curve segment and a first straight line segment; a starting point of the first curve segment is defined as an origin of coordinates, two perpendicular straight lines passing through the origin of coordinates on a plane where the first curve segment is located are respectively defined as X-axis and Y-axis, and a line perpendicular to both the X-axis and the Y-axis is defined as Z-axis; coordinates of an ending point of the first curve segment is (x3,y3), x3?0 and y3?0. The present invention also discloses a centrifugal fan and a range hood.

Abstract: A range hood, includes a fan system (2), the fan system (2) having a volute (21) and an impeller (22); the volute (21) includes a front cover (211), a rear cover (212) and an annular wall (213); the annular wall (213) has a volute tongue (214); the front cover (211) has an air inlet (215), the air inlet (215) faces downward to make the range hood to be a horizontal range hood; the volute tongue (214) is gradually inclined from the rear cover (212) to the front cover (211) in a direction opposite to the rotation direction of the impeller (22).

Abstract: A protection device for an oil-smoke sensor has a protection housing having two ends and an inner chamber; the first end having a first opening for receiving a probe of the oil-smoke sensor and in communication with the inner chamber; a second opening is disposed on the second end which is opposite to the first opening and in communication with the inner chamber. Because the probe is sealing mounted in the first opening, the probe will not be directly exposed in oil-smoke flow. The protective device is mounted such that the axial direction of the protective device is vertical to the oil-smoke flow direction. Therefore, the inner chamber of the protection housing has a pressure with respect to the oil-smoke flow that tangentially flows at a high speed, and the oil-smoke can only be diffused into the protection housing, thus, the probe is much less likely to be contaminated.

Abstract: The present invention discloses fan system, which includes a volute having a front cover, a rear cover and an annular wall connected between the front cover and the rear cover: an impeller disposed inside the volute, and a motor; the front cover has an air inlet facing downward in the state when the fan system is mounted; the motor includes a motor body and an edge; the edge is connected to the rear cover at the side of the rear cover facing the air inlet. The present invention further discloses a range hood equipped with the fan system and a mounting method for the flow guide device.

Abstract: A parallel double fan system, includes two fan systems disposed in parallel; wherein each fan system includes a volute having a front cover, a rear cover and an annular wall; the annular wall has a volute tongue; the rear cover has a first air outlet ocated above the corresponding volute tongue, two first air outlets in the two fan systems are communicated with each other. A range hood equipped with the parallel double fan system is also disclosed.

Abstract: An air guide box includes a box body. The box body includes a first wall and a second wall disposed opposite to each other. The first wall has an air inlet. Air outlets are respectively disposed between corresponding edges of the first and second walls. The second wall is recessed toward the first wall, and a portion of the second wall corresponding to the air inlet is a largest recessed position. From the largest recessed position to the air outlets, the second wall is gradually inclined in a direction away from the first wall, so that an inner surface of the second wall facing the first wall forms guiding slopes respectively form the largest recessed position to the edges of the first and second walls.

Abstract: The present invention discloses a panel mechanism of a range hood. The range hood comprises a left side plate (3), a right side plate (4), and a plurality of hanging pieces (5); the panel mechanism comprising a panel (1) and a panel frame (2), the panel frame (2) comprises a center plate (20), a left hanging bar (21), a right hanging bar (22) and a support bar (26), the left hanging bar (21) and the right hanging bar (22) has a plurality of hanging slots (23,24), each hanging slot (23,24) engages one hanging piece (5); the first hanging slot (23) is bent backward from the top to the down; and the second hanging slot (24) is sloped backward from the top to the down; the opening of each of the first hanging slot (23) and the second hanging slot (24) is bigger than the inner end of the first hanging slot (23) and the second hanging slot (24), enabling the first hanging slot (23) and the second hanging slot (24) to be hung on the corresponding hanging pieces (5) more easily.

Abstract: The present invention discloses a lifting mechanism for a moving component of a range hood and a range hood with the same, which comprises a mounting frame, a moving component, a motor, a transmission mechanism, two lifting rods, a connecting member and two guide rails. The transmission mechanism moves the connecting member up and down along the guide rails, so that the lifting rods and the moving component are allowed to move up and down. The power for the lifting motion is provided by the transmission mechanism, the guide rails on two sides ensure the stability of the lifting motion, and the lifting rods fixed on two sides of the connecting member further transfers the motion downward to the smoke guide plate, so that the lifting motion of the smoke guide plate is very stable.

Abstract: The present invention discloses a contactless control device for a range hood and a control method thereof. The contactless control device comprises two sets of infrared gesture sensing devices disposed on the housing of the range hood, and a detected signal analysis device. Each set of infrared gesture sensing devices comprises one infrared receiving device and at least one infrared transmitting device. The distance L between two infrared receiving devices meets the following condition: H*tan(?)+H*tan(?)+W_min<L<H*tan(?)+H*tan(?)+W_max. It is unnecessary to control the user's gesture sensing distance according to the intensity of the infrared transmitted signals. In this way, it is convenient to adjust the intensity of the infrared transmitted signals, and the infrared receiving device can better detect infrared signals.

Abstract: A wind outlet mechanism for a range hood comprises a wind outlet and a decorative cover. The decorative cover has a plurality of wind discharge holes, a flow guide member is disposed inside the decorative cover, and the flow guide member has a cambered flow guide surface opposite to and protruding toward the wind outlet. The flow guide surface can make the air flow discharged from the wind discharge holes on the decorative cover.

Abstract: The present invention discloses a burner cap. The burner cap comprises a main body (1) with an annular wall (10), a plurality of first main fire holes (11) is defined on the upper layer, and a plurality of second main fire holes (12) is defined on the lower layer; the annular wall (10) has an annular groove (2), and the annular wall (10) also has a fire holding channel (21), which connects to the annular groove (2) and connects to the first main fire holes (11), and/or the second main fire holes (12). So that the burner cap can significantly improve the combustion efficiency of the gas range while holding the flame from the first and second main fire holes.