Face mask assembly

1. A face mask assembly, comprising:

a frame, comprising a frame body provided with an air intake port;

an elbow assembly, comprising an air intake tube;

a connecting member, comprising a first end and a second end arranged opposite to each other, the first end is directly hinged to the air intake port so that the connecting member is able to swing freely in the air intake port based on the hinge point between the air intake port and the first end and in a certain angle range in an axial direction of the air intake port, and the second end having a forehead support directly fixed thereon and configured to communicate with the air intake tube, an end of the air intake tube connected with the second end of the connecting member is provided with an annular groove, and the forehead support and the second end of the connecting member are sleeved in the annular groove and relatively fixed;

the forehead support comprising a fitting part that is adapted to be fitted to a forehead, a mounting part fixedly mounted on the second end of the connecting member, so that the forehead support is connected to the frame body via the connecting member, and a connecting part connecting the fitting part and the mounting part;

wherein the mounting part of the forehead support has a mounting hole, and the second end of the connecting member is fitted in the mounting hole, the forehead support is able to swing due to the connecting member being swung.

2. The face mask assembly according to claim 1 , wherein an outer surface of the first end of the connecting member is a truncated spherical surface, and the air intake port is ball-hinged to the first end of the connecting member.

3. The face mask assembly according to claim 2 , wherein the first end of the connecting member includes a first limiting part arranged on the outer surface, an inner surface of the air intake port includes a second limiting part fitted with the first limiting part, and the first limiting part and the second limiting part are fitted with each other to prevent the connecting member from rotating within the air intake port around an axis of the air intake port.

4. The face mask assembly according to claim 3 , wherein the first limiting part is a first flat surface or concave spherical surface, the second limiting part is a second flat surface fitted with the first flat surface or a convex spherical surface fitted with the concave spherical surface.

5. The face mask assembly according to claim 3 , wherein the first limiting part is a groove extending in an axial direction of the connecting member; the second limiting part is a first protrusion arranged on the inner surface of the air intake port and fitted with the groove.

6. The face mask assembly according to claim 5 , wherein the outer surface of the first end of the connecting member is arranged with a second protrusion extending in a circumferential direction around an axis of the truncated spherical surface, the second protrusion is disposed on one side or two sides of the groove.

7. The face mask assembly according to claim 1 , wherein a limiting member is arranged on a surface of the forehead support that faces the frame body near a lower end of the mounting part.

8. The face mask assembly according to claim 7 , wherein the limiting member is a spring.

9. The face mask assembly according to claim 1 , wherein the face mask assembly further comprising an elastic member arranged in a clearance formed between the connecting part of the forehead support and the frame body.