Diaphragm pump of constant pressure type

Abstract

The present invention provides a diaphragm pump of constant pressure type, mainly wherein a passage tube links between said pressure discharge port and said inlet port of said pump cover body; Thereby, the extra water pressure coming from said compressed chamber can be orderly discharged through said pressure discharge port, next guided through said passage tube to reach said inlet port, then directly flowed into said low pressure chamber; Therefore, a close water circulation loop of discharge pressure is built by means of connecting said compressed chamber, said pressure discharge port, said passage tube, said inlet port and said low pressure chamber; Thus, the present invention not only provides the function of keeping constant pressure, but also completely recycles the drained water by extra water pressure without any waste in water resource; Moreover, the present invention not only has the energy-saving effect in power consumption, but also has the environment-protecting effect in reducing operation noise; Thus, it is really an innovative invention with multiple practical effect.

1 . A diaphragm pump of constant pressure type, which comprises: 
 a motor;    an upper lid chassis, which being on the top end of the output shaft of said motor and has some screw bores set up on its circumference;    three wobble plates, which being hinged in said upper lid chassis and are driven by the output shaft of said motor and being transferred into axially reciprocating motion;    a diaphragm valve frame, which covering on said upper lid chassis and has a high pressure valve embedded in the center of its top with some low pressure valves being embedded at the bottom side of the circumference of said high pressure valve; and    the pump cover body, having an inlet port and an outlet port are contrived on both corresponding ends of its outer rim; a ladder groove is circled at the bottom of its inner side; an annular groove facing towards said ladder groove is raised in the center of its inner side with an outlet orifice perforated to conduct with said outlet port; Wherein, the top end of said annular groove presses closely with the periphery of said high pressure valve on said diaphragm valve frame, so that a compressed chamber is formed between the inner side of said annular groove and said diaphragm valve frame as well as some low pressure chamber being formed among the outer side of said annular groove and the inner side of said pump cover body; In the pressure adjusting groove, which being indented at the outer top of the pump cover body with facing inwards of the annular groove, a pressure discharge orifice is perforated at its bottom side with facing towards said annular groove; An adjusting screw is inset in said pressure adjusting groove such that the end internally with a compressed spring and a baffle lump; Wherein, a passage tube links between said pressure discharge port and said inlet port of said pump cover body such that said compressed chamber, said pressure discharge port, said passage tube, said inlet port and said low pressure chamber building a close water circulation loop of discharge pressure.    
   
   
       2 . A diaphragm pump of constant pressure type as recited in the  claim 1 , wherein said passage tube is a bendable tube with flexibility.  
   
   
       3 . A diaphragm pump of constant pressure type as recited in the  claim 1 , wherein a circulating buffer annular groove is indented around said pressure discharge orifice at the outer circumference of the intersection of said pressure adjusting groove and said pressure discharge orifice; And, the lateral side of said circulating buffer annular groove and said pressure discharge port is conducted each other.  
   
   
       4 . A diaphragm pump of constant pressure type as recited in the  claim 1 , wherein said passage tube is an unitary integral body being molded together with said pump cover body.  
   
   
       5 . A diaphragm pump of constant pressure type as recited in the  claim 2 , wherein said passage tube and said inlet port being screwed to by a three-way manifold T.