Please select the most similar patent number from A, B, C and D. Which number is?
An air vent mechanism without front blades and an air venting method thereof. The method comprises the following steps: 1. an initial airflow from an air vent passing through an airflow door (4) such that the airflow undergoes a first adjustment, the airflow door (4) adjusting the initial airflow to be directed upward or downward; 2. when the adjusted airflow passes through a rib structure (5.1), guiding the airflow towards an edge of a housing (2, 3); and 3. causing the guided airflow to move towards the inside of the housing (2, 3), the housing being arc-shaped or circular, such that the airflow is deflected off the housing (2, 3) to achieve a final air vent angle of the airflow. The method omits front blades while still permitting an airflow to be easily adjusted upward, downward, leftward or rightward, thereby avoiding the issue in which front blades become loose as a result of frequent oscillations, and preventing air speed and air volume from being affected by airflow-blocking of the front blades.
A: A miniature fan comprising a housing and a support frame (2) used for supporting the housing, also comprising a regulating member (1) fitted with the support frame (2) and used for regulating wind direction. Because the regulating member (1) used for regulating the wind direction is arranged on the support frame (2), and the regulating member (1) is fitted with the support frame (2), the wind direction of the miniature fan can be regulated via the regulating member (1), thereby facilitating use for a user.
B: An air conditioner indoor unit and an air conditioner. The air conditioner indoor unit comprises a housing (1), and a first fan (2), a heat exchanger (3), and a second fan (4) disposed in the housing (1); the housing (1) is provided with a first air port (11) and a second air port (12); the first fan (2), the heat exchanger (3), and the second fan (4) are sequentially disposed in a direction from the first air port (11) to the second air port (12). Air flows in two wind directions can both exchange heat with the heat exchanger, and different operating modes of the air conditioner indoor unit can be matched with the above different wind directions according to the characteristics of warm and cool air and the positions of the first air port and the second air port, i.e., matched with one wind direction during cooling and the other wind direction during heating; thus, better comfort effect and higher temperature adjustment efficiency can be provided during both cooling and heating; moreover, under the action of the wind force of the two fans, the air volume is great, the heat exchange efficiency is high, and the temperature adjustment efficiency is further improved, thereby greatly improving user experience.
C: An air outlet structure, comprising a deflector rod assembly (5) and a front-row blade and a rear-row blade which are installed on a housing (1). One of the front-row blade and the rear-row blade is controlled by shifting the deflector rod assembly (5) up and down, and the other one of the front-row blade and the rear-row blade is controlled by rotating the deflector rod assembly (5). According to the air outlet structure, opening and closing the front-row blade and the rear-row blade are independently controlled by means of different actions of a deflector rod (53), preferably, opening and closing of an air door may also be independently controlled, for example, up-down rotation of horizontal blades of a front-row blade assembly is achieved by shifting the deflector rod assembly (5) up and down, left-right rotation of vertical blades of a rear-row blade assembly is achieved by rotating the deflector rod assembly (5), and opening and closing of the air door are achieved by plugging and unplugging the deflector rod assembly (5), such that mutual influence is avoided, and the compact arrangement of a space is achieved.
D: An air swinging assembly, provided in an air duct of a bladeless fan, the air duct being in communication with an air outlet; the air swinging assembly comprises movable fins (3) located at one side of the air outlet, and the movable fins (3) are rotatably connected to the air duct by means of a main shaft (32); the movable fins (3) are synchronously driven by a driving assembly to swing up and down so as to adjust the swing angle of the movable fins (3); and air is discharged from the air outlet after the air direction is changed by the movable fins (3). A bladeless fan comprising the air swinging assembly. The bladeless fan has an air swinging function by means of adding the air swinging assembly, and expands an air blowing range.
Answer: C