Circulating ventilation device for purifying air in compartment

[0024] refer to Figure 1-3 , a circulation ventilation device used for air purification inside the compartment, comprising a compartment wall 1, a hollow groove is opened in the compartment wall 1, and a rotating shaft 10 is installed on the upper surface of the compartment wall 1 through a stopper 9, and the stopper 9 It is a ball bearing, the upper end of the rotating shaft 10 is equipped with a circulation fan 11, the lower end of the rotating shaft 10 runs through the top wall of the hollow groove and extends into the hollow groove, and the middle part of the hollow groove is fixedly installed with a limit cylinder 12, and a disk is arranged inside the limit cylinder 12. Spring 14, one end of the coil spring 14 close to the limit tube 12 is fixedly connected with the inner wall of the limit tube 12, the end of the coil spring 14 away from the limit tube 12 is fixedly connected with a rotating plate 13, and the lower end of the rotating shaft 10 is connected to the rotating pl

[0037] refer to Figure 4 The difference between this embodiment and Embodiment 1 is that: the lower end of the rotating shaft 10 is fixedly connected with a circular plate 20, and a magnetic block is arranged inside the circular plate 20, and a convex groove 21 is opened on the rotary plate 13, and the circular plate 20 is located on the convex In the shaped groove 21, and against the convex groove 21, the bottom of the convex groove 21 is embedded with a permanent magnet plate 22, and the magnetic poles of the magnetic block and the permanent magnet plate 22 are facing oppositely;

[0038] The circulation fan 11 includes a mounting plate 18. An annular groove is formed in the mounting plate 18, and an expansion member 17 is disposed in the annular groove. A plurality of drainage grooves 19 communicating with the annular groove are formed on the mounting plate 18.

[0039] When the present embodiment is used, the stopper 9 is no longer a bearing, but a circular ring embedded wit