Water pump

Abstract

A water pump for delivering water from a well to the surface has a housing with a reciprocable plunger disposed therein. The housing is preferably comprised of PVC and tubulars which are connected to make up the plunger assembly are likewise PVC. A proximity bushing is disposed in the housing and the plunger assembly reciprocates in the housing through the proximity bushing. Reciprocation of the plunger assembly draws water into the housing and forces water from the housing into the plunger assembly to the surface.

1 . A water pump for pumping water from a well drilled into the ground comprising:
 a housing having a first opening for permitting the ingress of water from the well into the housing;   a proximity bushing fixed in the housing;   a plunger assembly reciprocably disposed in the housing and closely received in the proximity bushing, the plunger assembly having a first opening at a first end thereof for the ingress of water into a flow passage defined by the plunger assembly; and   first and second check valves for preventing the expulsion of water through the first end of the housing and the first end of the plunger assembly.   
     
     
         2 . The water pump of  claim 1 , the housing comprising:
 a guide cylinder; and   a pressure cylinder, the pressure cylinder being positioned below the proximity bushing, wherein the proximity bushing extends into a central opening defined by the housing.   
     
     
         3 . The water pump of  claim 1 , wherein the interaction between the proximity bushing and the plunger assembly creates a negative pressure in the pressure cylinder to draw water therein through the first opening in the housing when the first end of the plunger assembly is pulled towards the proximity bushing. 
     
     
         4 . The water pump of  claim 3 , wherein water in the pressure cylinder moves into the flow passage in the plunger assembly when the first end of the plunger assembly is moved away from the proximity bushing. 
     
     
         5 . The water pump of  claim 4 , wherein water passes through the plunger assembly to the surface. 
     
     
         6 . The water pump of  claim 1  further comprising a plurality of proximity bushings fixed in the housing and closely received about the plunger assembly. 
     
     
         7 . The water pump of  claim 1 , wherein the proximity bushing is comprised of a material selected from the group consisting of PVC, nylon, UHMW or KYNAR®. 
     
     
         8 . The water pump of  claim 1 , the housing comprising the pressure cylinder with a guide cylinder connected thereto, wherein the proximity bushing prevents substantially all of the water from passing from the pressure cylinder into the guide cylinder. 
     
     
         9 . The water pump of  claim 1 , wherein the housing and the plunger assembly are comprised of PVC. 
     
     
         10 . A water pump comprising:
 a pressure cylinder with a one-way valve at a first end thereof for permitting flow into the pressure cylinder therethrough;   a guide cylinder connected to the pressure cylinder;   a proximity bushing separating the pressure cylinder and the guide cylinder; and   a plunger assembly reciprocably disposed in the guide and pressure cylinders and closely received in the proximity bushing, wherein reciprocation of the plunger assembly through the proximity bushing draws water into the pressure cylinder and forces water into the plunger assembly.   
     
     
         11 . The water pump of  claim 10 , wherein the guide cylinder and pressure cylinder are comprised of PVC. 
     
     
         12 . The water pump of  claim 11 , the plunger assembly comprising a plurality of connected tubulars, the tubulars comprised of PVC. 
     
     
         13 . The water pump of  claim 10 , the one-way valve at the first end of the pressure cylinder comprising a first check valve, and further comprising a second check valve at a first end of the plunger assembly, wherein the first and second check valves permit flow into the pressure cylinder and plunger assembly and prevent flow out of the pressure cylinder and plunger assembly through the first ends thereof. 
     
     
         14 . The water pump of  claim 13 , wherein at least one of the first and second check valves is a flapper valve. 
     
     
         15 . The water pump of  claim 13 , wherein at least one of the check valves comprises:
 a sleeve with a closing seat defined thereon; and   a closing ball engageable with the seat to prevent flow through the sleeve in a first direction, the closing ball being disengageable from the seat to permit flow through the sleeve in a second direction.   
     
     
         16 . A water pump for use in a well comprising:
 a PVC housing disposed in the well;   a non-elastomeric proximity bushing disposed in the PVC housing; and   a plunger assembly closely received in the proximity bushing and reciprocable in the housing, the plunger assembly comprising a plurality of connected PVC tubulars.   
     
     
         17 . The water pump of  claim 16 , further comprising:
 a first check valve for permitting flow into the housing and preventing flow out of the housing; and   a second check valve for permitting flow into the plunger assembly.   
     
     
         18 . The water pump of  claim 15 , wherein reciprocation of the plunger assembly pulls water into the housing, and forces water from the housing into the plunger assembly which delivers the water to the surface. 
     
     
         19 . The water pump of  claim 17 , wherein the proximity bushing is comprised of a material selected from the group consisting of PVC, nylon, UHMW or KYNAR®. 
     
     
         20 . The water pump of  claim 16  wherein the proximity bushing separates the housing into a pressure cylinder to which water is received when the plunger reciprocates, and a guide cylinder above the pressure cylinder.