Diaphragm pump

Abstract

A diaphragm pump including: a pump body including an upper cover, a valve seat and a cylinder body connected in sequence. The valve seat has a water inlet hole and a water outlet hole. The upper cover and the valve seat define a water inlet cavity and a water outlet cavity independent from each other. The water inlet hole communicates with the water inlet cavity while the water outlet hole communicates with the water outlet cavity. A mounting base is provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members are formed at a top of the water outlet cavity and extend downwards. A water inlet valve block is provided to a bottom surface of the valve seat to open or close the water inlet hole. A diaphragm assembly controls opening or closure of the water outlet hole.

What is claimed is: 
     
         1 . A diaphragm pump, comprising:
 a pump body comprising an upper cover, a valve seat and a cylinder body connected in sequence, the valve seat having a water inlet hole and a water outlet hole, the upper cover and the valve seat defining a water inlet cavity and a water outlet cavity independent from each other, the water inlet hole being in communication with the water inlet cavity while the water outlet hole being in communication with the water outlet cavity, a mounting base being provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members being formed at a top of the water outlet cavity and extending downwards;   a water inlet valve block provided to a bottom surface of the valve seat to open or close the water inlet hole;   a diaphragm assembly mounted to the mounting base to control opening or closure of the water outlet hole, and comprising a plurality of water outlet valve blocks arranged opposite to the plurality of first position-limiting members;   a piston assembly connected to a bottom of the valve seat, and comprising a capsule body having a capsule cavity, the capsule cavity being communicated with the water inlet cavity and the water outlet cavity through the water inlet hole and the water outlet hole respectively;   a connecting rod assembly driving the capsule body to swing up and down between an upper movement dead point and a lower movement dead point to squeeze or stretch the capsule cavity so as to realize a function of pumping fluid, the connecting rod assembly comprising: a connecting rod connected with the capsule body, a steel shaft having an upper end connected with a connecting hole, and an eccentric wheel connected with a lower end of the steel shaft;   a driving assembly comprising: a base seat connected to the pump body to define a chamber and an electric motor having an electric motor shaft connected with the eccentric wheel.   
     
     
         2 . The diaphragm pump according to  claim 1 , wherein the diaphragm assembly comprises a positioning plate having an upper surface and a lower surface both configured as flat surfaces, and the positioning plate comprises:
 a central positioning plate; and   positioning strips connected to a circumferential edge of the central positioning plate and extends along a radial direction of the central positioning plate,   wherein the water outlet valve block is connected to the circumferential edge of the central positioning plate and extends along the radial direction of the central positioning plate, and a distance between an upper surface of the water outlet valve block and the upper surface of the positioning plate is identical to a distance between a lower surface of the water outlet valve block and the lower surface of the positioning plate, the water outlet valve block being located between two positioning strips.   
     
     
         3 . The diaphragm pump according to  claim 2 , wherein the mounting base has a mounting groove matching the positioning plate in shape, and the mounting groove comprises:
 a central groove in which the central positioning plate is snapped;   branch grooves distributed in a circumferential direction of the central groove and communicated with the central groove, the positioning strip being snapped in the branch groove, a second position-limiting member being provided to the top of the water outlet cavity, and a lower end of the second position-limiting member being in contact with an upper surface of the positioning strip.   
     
     
         4 . The diaphragm pump according to  claim 3 , wherein a distance between an upper surface of the branch groove and the lower end of the second position-limiting member is smaller than a thickness of the positioning strip. 
     
     
         5 . The diaphragm pump according to  claim 3 , wherein the central groove is provided with a first positioning column, and the central positioning plate is provided with a first positioning hole fitted with the first positioning column. 
     
     
         6 . The diaphragm pump according to  claim 3 , wherein a rib is provided along a peripheral edge of the mounting groove. 
     
     
         7 . The diaphragm pump according to  claim 6 , wherein an end of the branch groove away from the central groove is provided with a baffle, and an upper surface of the baffle is higher than an upper surface of the rib. 
     
     
         8 . The diaphragm pump according to  claim 6 , wherein the bottom of the water outlet cavity is provided with a support stand having a through hole in communication with the water outlet hole, and the support stand is connected to the rib at a circumferential edge of the central groove. 
     
     
         9 . The diaphragm pump according to  claim 8 , wherein a diaphragm part is provided between the water outlet valve block and the central positioning plate, and an arc groove is formed at a position where a peripheral edge of the diaphragm part is connected with the positioning strip. 
     
     
         10 . The diaphragm pump according to  claim 9 , wherein a connecting bridge is provided between the support stand and the rib, and the connecting bridge is disposed opposite to the diaphragm part. 
     
     
         11 . The diaphragm pump according to  claim 2 , wherein the positioning strips are equally spaced and distributed along the circumferential edge of the central groove, and the water outlet valve block and two adjacent positioning strips are spaced from each other. 
     
     
         12 . The diaphragm pump according to  claim 1 , wherein the upper cover constructs a downwardly open cavity structure, and an upper annular partition plate is provided to a bottom surface of the upper cover; the valve seat constructs an upwardly open cavity structure, and a lower annular partition plate corresponding to the upper annular partition plate is provided to a top surface of the valve seat. 
     
     
         13 . The diaphragm pump according to  claim 1 , wherein a bottom surface of the cylinder body extends downwards to form a stopping member, and a lower end face of the stopping member is opposite to and spaced at a predetermined distance from a central position in a top surface of the connecting rod. 
     
     
         14 . The diaphragm pump according to  claim 1 , wherein the capsule body comprises:
 a plurality of capsule cavities open upwards;   a panel located between the valve seat and the cylinder body and connected to respective upper outer circumferential edges of the plurality of capsule cavities, so as to connect the plurality of capsule cavities into a whole;   a mounting column connected to a bottom of the capsule cavity, the connecting rod being provided with a second mounting hole fitted with the mounting column.   
     
     
         15 . The diaphragm pump according to  claim 14 , wherein the capsule cavity comprises:
 a thin-walled part having a bottom surface connected with an upper end of the mounting column; and   a thick-walled part having a lower end whose circumferential edge is connected with a circumferential edge of an upper end of the thin-walled part, and an upper end whose circumferential edge is connected with a bottom surface of the panel.   
     
     
         16 . The diaphragm pump according to  claim 15 , wherein a wall thickness of the thick-walled part is larger than that of the thin-walled part. 
     
     
         17 . The diaphragm pump according to  claim 14 , wherein a second positioning column is provided to a top surface of the cylinder body and extends upwards, and the panel is provided with a second positioning hole fitted with the second positioning column. 
     
     
         18 . The diaphragm pump according to  claim 17 , wherein the second positioning column is in interference fit with the second positioning hole. 
     
     
         19 . The diaphragm pump according to  claim 1 , wherein the cylinder body is provided with a first mounting hole, and the capsule body is snapped into the first mounting hole and immobilized relative to the first mounting hole. 
     
     
         20 . The diaphragm pump according to  claim 1 , wherein a columnar boss is provided to the bottom surface of the valve seat and extends downwards, the columnar boss has the water inlet hole penetrating through the bottom and top surfaces of the valve seat, and a circumferential wall of the columnar boss extends obliquely from up to down to form a first inclined surface. 
     
     
         21 . The diaphragm pump according to  claim 20 , wherein an upper inner circumferential edge of the capsule cavity extends obliquely from up to down to form a second inclined surface, the first inclined surface being closely fitted with the second inclined surface. 
     
     
         22 . The diaphragm pump according to  claim 20 , wherein the columnar boss has a third positioning hole configured to immobilize the water inlet valve block, and a plurality of water inlet holes are defined in a circumferential direction of the third positioning hole. 
     
     
         23 . The diaphragm pump according to  claim 22 , wherein the water inlet valve block comprises:
 a valve membrane covering the water inlet hole; and   a third positioning column having a first end connected to the valve membrane and a second end upwardly extending through the third positioning hole.   
     
     
         24 . The diaphragm pump according to  claim 23 , wherein the first end of the third positioning column forms an anti-rotation flange, and the third positioning hole has a position-limiting groove fitted with the anti-rotation flange. 
     
     
         25 . The diaphragm pump according to  claim 23 , wherein the second end of the third positioning column has a position-limiting protrusion, and the position-limiting protrusion abuts against the top surface of the valve seat. 
     
     
         26 . The diaphragm pump according to  claim 20 , wherein the columnar boss has an avoidance notch, and an inlet end of the water outlet hole is arranged opposite to the avoidance notch. 
     
     
         27 . The diaphragm pump according to  claim 20 , wherein three columnar bosses are provided to the bottom surface of the valve seat, and the three columnar bosses constitute an equilateral triangle. 
     
     
         28 . The diaphragm pump according to  claim 1 , wherein the connecting rod comprises:
 a rod body having a first end of the rod body provided with the connecting hole extending along an axial direction of the rod body, a circumferential face of the connecting hole being provided with a plurality of heat radiating grooves, and the plurality of heat radiating grooves extending along an axial direction of the connecting hole; and   a mounting plate connected to a second end of the rod body, a plurality of connecting arms being spaced along a circumferential direction of the mounting plate, the mounting plate having a plurality of material-reducing holes formed by recessing a top surface of the mounting plate downwardly, the plurality of connecting arms obliquely extending downwards and outwards from a central position in the mounting plate, a free end of each connecting arm being provided with a mounting protrusion, and a lower end face of the mounting protrusion being lower than a lower end face of the connecting arm.   
     
     
         29 . The diaphragm pump according to  claim 28 , wherein a reinforcing rib is provided between an outer circumferential surface of the mounting protrusion and an outer circumferential surface of the rod body, and the reinforcing rib extends upwards to be connected to a bottom surface of the mounting plate. 
     
     
         30 . The diaphragm pump according to  claim 1 , further comprising:
 a photoelectric shielding sheet integrally formed with the eccentric wheel and rotating synchronously with the eccentric wheel and the electric motor shaft; and   a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft and send a detection signal to an electric motor controller, the electric motor controller being configured to adjust the rotational speed of the electric motor shaft of the electric motor according to the detection signal.   
     
     
         31 . The diaphragm pump according to  claim 30 , wherein the photoelectric shielding sheet extends outwards along a radial direction of the eccentric wheel. 
     
     
         32 . The diaphragm pump according to  claim 30 , wherein the photoelectric shielding sheet comprises:
 a positioning portion provided to an upper surface of the eccentric wheel; and   a shielding portion connected to the positioning portion and extending radially outwards.