Dosing pump

Abstract

A dosing pump includes a dosing chamber ( 14 ), a suction channel ( 32 ) communicating with the dosing chamber ( 14 ) and a pressure channel ( 20 ) communicating with the dosing chamber ( 14 ). Features for popping gas bubbles are arranged in the suction channel

1 . A metering pump comprising:
 a dosing chamber;   an intake channel connected with the dosing chamber;   a pressure chamber connected with the dosing; and   a means for breaking up gas bubbles, said means breaking up gas bubbles being arranged in the intake channel.   
     
     
         2 . The metering pump according to  claim 1 , wherein the means for breaking up gas bubbles comprises a sudden cross sectional expansion in the intake channel. 
     
     
         3 . The metering pump according to  claim 2 , wherein the cross section of the intake channel expands from a first, smaller cross section to a second, larger cross section, wherein the surface of the first cross section corresponds to 0.3 to 0.8 times the surface of the second cross section. 
     
     
         4 . The metering pump according to  claim 2 , further comprising a valve in the intake channel, wherein the cross section of the intake channel expands from a first, smaller cross section to a second, larger cross section, wherein the smaller cross section is defined by an outlet of the valve in the intake channel. 
     
     
         5 . The metering pump according to  claim 4 , wherein the valve has a valve body held in a cage, and the smaller cross section is defined by a free spaces lying between ribs of the cage and the valve body. 
     
     
         6 . The metering pump according to  claim 1 , wherein the pressure channel, in a first section adjoining the dosing chamber, extends upwardly away from the dosing chamber, inclined relative to a vertical direction. 
     
     
         7 . The metering pump according to  claim 6 , further comprising a valve, wherein a second section, that extends in the vertical direction and incorporates the valve adjoins the first section of the pressure channel downstream. 
     
     
         8 . The metering pump according to  claim 1 , wherein the intake channel in a first section adjoining the dosing chamber extends downwardly away from the dosing chamber, inclined relative to a vertical direction. 
     
     
         9 . The metering pump according to  claim 8 , further comprising a valve, wherein a second section that extends in the vertical direction and incorporates the valve adjoins the first section of the intake channel upstream. 
     
     
         10 . The metering pump according to  claim 6 , further comprising a positive-displacement body, wherein the first section of the pressure channel is inclined in a direction relative to the vertical direction that faces away from a positive-displacement body of the metering pump. 
     
     
         11 . The metering pump according to  claim 1 , wherein the pressure channel and/or the intake channel are connected with the dosing chamber in the area of its outer periphery. 
     
     
         12 . The metering pump according to  claim 1 , wherein a first section of the pressure channel and/or a first section of the intake channel have a diameter greater than 4 mm. 
     
     
         13 . The metering pump according to  claim 1 , further comprising a valve in the pressure channel and a valve in the intake channel, wherein a vertical distance between the valve in the pressure channel and the valve in the intake channel is equal to or less than 2.5 times, a maximum diameter of the dosing chamber. 
     
     
         14 . The metering pump according to  claim 1 , further comprising a positive-displacement body comprising a membrane, a valve in the pressure channel and a valve in the intake channel, wherein a vertical distance between the valve ( 26 ) in the pressure channel and the valve in the intake channel is equal to or less than an outer diameter of the membrane forming the positive-displacement body. 
     
     
         15 . The metering pump according to  claim 9 , further comprising a positive-displacement body, wherein the first section of the intake channel is inclined in a direction relative to the vertical direction that faces away from a positive-displacement body of the metering pump. 
     
     
         16 . A metering pump comprising:
 structure defining a dosing chamber;   structure defining an intake channel connected with the dosing chamber;   structure defining a pressure chamber connected with the dosing; and   structure breaking up gas bubbles in the intake channel.   
     
     
         17 . The metering pump according to  claim 16 , wherein the structure breaking up gas bubbles in the intake channel comprises a sudden cross sectional expansion in the intake channel. 
     
     
         18 . The metering pump according to  claim 17 , further comprising a valve in the intake channel, wherein the cross section of the intake channel expands from a first, smaller cross section to a second, larger cross section, wherein the smaller cross section is defined by an outlet dimension of the valve in the intake channel. 
     
     
         19 . The metering pump according to  claim 16 , further comprising a positive-displacement body, wherein a first section of the pressure channel extends upwardly away from the dosing chamber, inclined relative to a vertical direction that faces away from a positive-displacement body of the metering pump. 
     
     
         20 . The metering pump according to  claim 16 , further comprising a positive-displacement body, wherein a first section of the intake channel is inclined in a direction relative to the vertical direction that faces away from a positive-displacement body of the metering pump.