All-plastic trigger spray pump

An all-plastic trigger spray pump, characterized by comprising a pump body (1), wherein a lower part of the pump body (1) is connected with a locking cover (8);

• a liquid spray channel (11) is provided in the pump body (1);
• a nozzle (2) is provided at an outlet of the liquid spray channel (11);
• a liquid outlet channel (12) and a liquid inlet channel (13) which are vertically isolated from each other are provided in the pump body (1);
• the liquid outlet channel (12) is communicated with the liquid spray channel (11);
• a liquid guide chamber (14) is provided on a side of the liquid outlet channel (12) and the liquid inlet channel (13);
• an upper part of the liquid guide chamber (14) is always in communication with the liquid outlet channel (12) by means of a normally open port (15);
• a pumping piston (3) is provided in the liquid guide chamber (14);
• a trigger (4) capable of driving the pumping piston (3) to do piston movement in a left-right direction in the liquid guide chamber (14) is hinged onto the pump body (1);
• an elastic arm (5) capable of pressing against the pump body (1) and driving the trigger (4) to return the pumping piston (3) back is provided on the trigger (4);
• a lateral one-way valve that can be opened during the return movement of the pumping piston (3) so as to enable the liquid guide chamber (14) to be communicated with the liquid inlet channel (13) is provided between the liquid guide chamber (14) and the liquid inlet channel (13), wherein the lateral one-way valve comprises a T-shaped valve plug (6), which comprises a fixed shaft (61) and an elastic valve plate (62);
• a convex ring (63) located on one side of the fixed shaft (61) is provided at an edge of the valve plate (62);
• a shaft hole (16) and a communication hole (17) enabling the liquid guide chamber (14) to be communicated with the liquid inlet channel (13) are provided on the pump body (1);
• the shaft hole (16) and the communication hole (17) are located inside the convex ring (63);
• the fixed shaft (61) is fixed to the shaft hole (16);
• a flat bottom (140) opposite to the convex ring (63) is provided on a rightmost side of the liquid guide chamber (14);
• the convex ring (63) abuts on the flat bottom (140) under elastic action of the valve plate (62) to achieve sealing.