Quick-Exhaust Diaphragm Pump

Abstract

The invention discloses a quick-exhaust diaphragm pump, belonging to the technical field of diaphragm pumps. The key points of the technical scheme of the quick-exhaust diaphragm pump comprises that a buffer seat is arranged at the lower end of the valve seat; a buffer slot is formed in the buffer seat; when the buffer seat is covered on the valve seat, a buffer space is formed by the lower surface of the valve seat and the buffer slot. The quick-exhaust diaphragm pump can prevent airflow in the pressure relief airbag from fluctuating and improves the stability of supply airflow.

What is claimed is: 
     
         1 . A quick-exhaust diaphragm pump, comprising an upper cover body ( 1 ), a valve seat ( 2 ) and a valve plate ( 3 ), wherein when the upper cover body ( 1 ) is covered on the valve seat ( 2 ), a communication cavity ( 6 ) is formed; an air outlet ( 4 ) and a pressure relief opening ( 5 ) are formed in the upper cover body ( 1 ); the communication cavity ( 6 ) communicates with the air outlet ( 4 ) and the pressure relief opening ( 5 ); the valve plate ( 3 ) is arranged between the valve seat ( 2 ) and the upper cover body ( 1 ); a pressure relief airbag ( 7 ) for opening or closing the pressure relief opening ( 5 ) is arranged on the valve plate ( 3 ); an air inlet passage ( 8 ) for communicating with the pressure relief airbag ( 7 ) and an air release passage ( 9 ) for discharging air in the pressure relief airbag ( 7 ) are arranged on the valve seat ( 2 ); a buffer seat ( 10 ) is arranged at a lower end of the valve seat ( 2 ); a buffer slot ( 11 ) is formed in the buffer seat ( 10 ); when the buffer seat ( 10 ) is covered on the valve seat ( 2 ), a buffer space ( 12 ) is formed by the lower surface of the valve seat ( 2 ) and the buffer slot ( 11 ); and a supply passage ( 13 ) for communicating with the buffer space ( 12 ) and the air inlet passage ( 8 ) is arranged on the valve seat ( 2 ). 
     
     
         2 . The quick-exhaust diaphragm pump of  claim 1 , further comprising a piston device ( 14 ) for conveying air to the supply passage ( 13 ), the piston device ( 14 ) comprises a piston seat ( 18 ) arranged at the lower end of the buffer seat ( 10 ), a diaphragm portion ( 19 ) located between the piston seat ( 18 ) and the buffer seat ( 10 ), and a driving component ( 20 ) for driving the diaphragm portion ( 19 ) to incline; an air inlet ( 21 ) is formed in the piston seat ( 18 ); a one-way inlet ( 22 ) communicating with the air inlet ( 21 ) and piston airbags ( 24 ) located at the two sides of the one-way inlet ( 22 ) and forming a pump chamber ( 23 ) are arranged on the diaphragm portion ( 19 ). 
     
     
         3 . The quick-exhaust diaphragm pump of  claim 2 , characterized in that the driving component ( 20 ) comprises a base plate ( 29 ) in transmission connection with the piston airbags ( 24 ), a rotating wheel ( 31 ) eccentrically connected to the base plate ( 29 ) by a connecting rod ( 30 ), and a motor ( 32 ) for driving the rotating wheel ( 31 ) to rotate. 
     
     
         4 . The quick-exhaust diaphragm pump of  claim 3 , characterized in that locking holes ( 34 ) are formed in the base plate ( 29 ), and locking portions ( 35 ) clamped in the locking holes ( 34 ) extend from the piston airbags ( 24 ). 
     
     
         5 . The quick-exhaust diaphragm pump of  claim 2 , characterized in that the bottom of the buffer slot ( 11 ) is provided with collecting passages ( 25 ) communicating with the pump chamber ( 23 ) and a one-way valve plate ( 26 ) for preventing the reverse flow of air entering the collecting passages ( 25 ). 
     
     
         6 . The quick-exhaust diaphragm pump of  claim 5 , characterized in that the bottom of the buffer slot ( 11 ) is provided with a sunken portion ( 27 ) which is sunken inwardly, and a protruding portion ( 28 ) embedded in the sunken portion ( 27 ) extends from the one-way valve plate ( 26 ). 
     
     
         7 . The quick-exhaust diaphragm pump of  claim 1 , characterized in that positioning blocks ( 15 ) extending toward the valve seat ( 2 ) are arranged at the edges of the two sides of the buffer seat ( 10 ), and positioning grooves ( 16 ) in which the positioning blocks ( 15 ) are embedded are formed in the valve seat ( 2 ). 
     
     
         8 . The quick-exhaust diaphragm pump of  claim 7 , characterized in that the inner sides of the positioning blocks ( 15 ) are provided with guiding surfaces ( 17 ) with low ends inclined toward the buffer slot ( 11 ).