Vertical submerged pump for chemical application

Abstract

The present invention discloses structural improvement of the vertical submerged pump for chemical application. The present invention is focus on reducing the crystal lump generated from high speed etching process. Structural improvement includes a shaft seal device, a diffuser and an upper inner plate. The shaft seal device offer extra flow resistance to balance the differential pressure between the inner space and pump front casing, the function are prevents air bubbles be sucked into the pump, and reduces flow leakage from the front casing into inner space, also absorbs high-pressure back-flush to avoid liquid splash in dry surface of inner space of support column. The diffuser in the support column offer extra inducer function to guides the liquid from the inner space flowing out to the tank, so as to get a stable liquid level in the inner space, thereby largely reducing splashing of the liquid. And the upper inner plate blocks the residual small amount drops from liquid splashing, to minimize producing of crystals lump from high speed etching liquid.

1 . A vertical submerged pump for chemical application, the structural improvement includes the shaft seat device, the diffuser in the pump column and the upper inner plate of the support column, their features are as flows:
 A shaft seal device has a rotor of N-type seal and a stator of N-type seal, the stator is provided with an outer cylindrical part of the stator and a plate part of the stator, the stator is installed in an inner surface of a pump casing by the plate part of the stator, the cylindrical stator is provided with two inner column surfaces of different radii and a conical part which is extended downward, the cylindrical rotor is provided with two outer column surfaces of different radii and a conical part which is extended upward, the rotor is installed on an impeller hub by an inner diameter of the rotor, after the pump is assembled, the rotor is located at a relative position to the stator, the inner column surfaces of the stator and the outer column surfaces of the rotor match each other to form a non-contact seal channel which having two sharp turns with a bending angle larger than 90°, and plural stator holes are located at the first sharp turn of the seal channel on the stator to connect to an inner space;   a diffuser in a support column is provided with plural diffuser holes and plural diffuser blades, the diffuser blades are arc shape and are installed on an inner wall of the support column, the plural diffuser blades are arranged alternately with the plural diffuser holes, the diffuser blades are arranged opposite to the flow direction of the liquid, and the flow channel is formed by the neighboring diffuser blades, an inlet of the flow channel is constituted by leading edges of the neighboring diffuser blades also, and the diffuser holes are located on an inner wall of the support column in the flow channel, the diffuser blade has a small incident angle in horizontal circumference at the leading edge, allowing the liquid to smoothly flow into the inlet of the diffuser in the support column without changing the flow direction significantly;   an upper inner plate of the support column which is installed in an interior side of the support column, and is located below an upper hole of the support column, with a center of which being provided with a hole to form a larger radial clearance with an outer diameter of a shaft sleeve.   
     
     
         2 . The vertical submerged pump for chemical application according to  claim 1 , wherein, a diffuser in a support column which is provided with plural diffuser holes and plural diffuser blades, the diffuser blades are arc shape and are installed on an inner wall of the support column, the plural diffuser blades are arranged alternately with the plural diffuser holes, the leading edge of the diffuser blade of the diffuser in the support column is located above the diffuser holes, and the trailing edge of the diffuser blade is located below the next diffuser hole, the diffuser blades are arranged against to the flow direction of the liquid and kept an incident angle at leading edge of diffuser blade; the flow channels are formed by the neighboring diffuser blades, an inlet of the flow channel is constituted by leading edges of the neighboring diffuser blades also, an outlet of the flow channel is constituted by trailing edges of the neighboring diffuser blades and the diffuser holes are located on an inner wall of the support column in the flow channel. 
     
     
         3 . The vertical submerged pump for chemical application according to  claim 1 , wherein the diffuser in the pump column is located in a middle or lower part of the support column. 
     
     
         4 . The vertical submerged pump for chemical application according to  claim 1 , wherein, the diffuser in the support column is formed by plural diffuser holes only, which is arranged in a circumference of the support column, the diffuser holes have an oblique opening and form a small bevel angle against the circumference flow. 
     
     
         5 . The vertical submerged pump for chemical application according to  claim 1 , wherein, a diffuser in a support column which is provided with plural longitude diffuser holes and plural longitude diffuser blades with span B, the diffuser blades are arc shape and installed on an inner wall of the support column, the plural diffuser blades are arranged alternately with the plural diffuser holes in circumference, the root of the diffuser blade is located at the side wall of the long diffuser hole, the diffuser blades are arranged opposite to the flow direction of the liquid, and the flow channel is formed by the diffuser blades, the inner wall of support column, and the longitudinal diffuser hole, the leading edge of the diffuser blade has an incident angle in circumference, the root of the diffuser blade has another angle as same as the oblique angle of diffuser hole in circumference. 
     
     
         6 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2  and  claim 5 , wherein, the diffuser blade is a single circular arc structure or a complex circular arc structure. 
     
     
         7 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2  and  claim 5 , wherein, an incident angle between the leading edge of the diffuser blade and a horizontal circumference is less than 45°. 
     
     
         8 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2  and  claim 5 , wherein, the plural diffuser blades on the support column could be made in different ways, including each blade welded on or inserted in, or an integral cascade ring by plastic injection. 
     
     
         9 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2  and  claim 5 , wherein, the plural diffuser blade on the support column could have the same span width or unequal span width. 
     
     
         10 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2 ,  claim 4  and  claim 5 , wherein, the plural diffuser holes on the support column could be longitude hole in parallel or incline hole in parallel. 
     
     
         11 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2 ,  claim 4  and  claim 5 , wherein, the diffuser in the support column is formed by plural diffuser holes only, the plural diffuser holes on the support column could be arranged in one row or multi-row around the support column. 
     
     
         12 . The vertical submerged pump for chemical application according to  claim 1  and  claim 4 , wherein, the diffuser in the support column is formed by plural diffuser holes and diffuser blades, or plural diffuser holes only, which are arranged in a circumference of the support column, the diffuser holes have an oblique opening and the oblique angle is less than 45°. 
     
     
         13 . The vertical submerged pump for chemical application according to  claim 1 ,  claim 2 ,  claim 4  and  claim 5 , wherein, the diffuser in the support column is formed by plural diffuser holes and diffuser blades, the plural diffuser holes and the diffuser blades on the support column could be arranged in one row or multi-row around the support column, and the multi-row could be staged for each row. 
     
     
         14 . The vertical submerged pump for chemical application according to  claim 1 , wherein, the diffuser in the support column is formed by plural diffuser holes and diffuser blade, which are arranged in a circumference of the support column, the diffuser holes have an oblique opening and the oblique angle is less than 60°. 
     
     
         15 . The vertical submerged pump for chemical application according to  claim 1 , wherein, the diffuser blades as same as the diffuser hole are longitude holes in parallel or incline holes in parallel. 
     
     
         16 . A submerged vertical pump for chemical application, the structural improvement of the shaft seal device to offer extra flow resistance to separate liquid between the high pressure liquid from pump casing and low pressure liquid from inner space of support column, the shaft seal device is comprised of:
 A shaft seal device has a rotor of N-type seal and a stator of N-type seal, the stator is provided with an outer cylindrical part and a plate part of the stator, the stator is installed in an inner surface of a pump casing by the plate part of the stator, the cylindrical stator is provided with two inner column surfaces of different radii and a conical part which is extended downward, the cylindrical rotor is provided with two outer column surfaces of different radii and a conical part which is extended upward, the rotor is installed on an impeller hub by an inner diameter of the rotor, after the pump is assembled, the rotor is located at a relative position to the stator, the inner column surfaces of the stator and the outer column surfaces of the rotor match each other to form a non-contact seal channel which has two sharp turns with a bending angle larger than 90°, and plural stator holes are located at the first sharp turn of the seal channel on the stator to connect to an inner space.   
     
     
         17 . The vertical submerged pump for chemical application according to  claim 16 , wherein, plural rotor holes are located at the second sharp turn of the seal channel on the rotor to connect to an inner space. 
     
     
         18 . The vertical submerged pump for chemical application according to  claim 16 , wherein, the stator is provided with an outer cylindrical part of the stator and a plate part of the stator, the outer cylindrical surface has a screw part, stator could be installed in inner surface of a pump casing by the screw, and till the plate part of the stator tied on the inner surface of pump front casing. 
     
     
         19 . A submerged vertical pump for chemical application, the structural improvement of the shaft seal device to offer extra flow resistance to separate liquid between the high pressure liquid from pump casing and low pressure liquid from inner space of support column, the shaft seal device is comprised of:
 A shaft seal device has a rotor of N-type seal and a stator of N-type seal, the stator is provided with an outer cylindrical part of the stator, the stator is installed in an inner surface of a pump casing, the cylindrical stator is provided with two inner column surfaces of different radii and a conical part which is extended downward, the cylindrical rotor is provided with two outer column surfaces of different radii and a conical part which is extended upward, the rotor is installed on an impeller hub by an inner diameter of the rotor after the pump being assembled, the rotor is located at a relative position to the stator, the inner column surfaces of the stator and the outer column surfaces of the rotor match each other to form a non-contact seal channel which have two sharp turns with a bending angle larger than 90°, and plural stator holes are located at the first sharp turn of the seal channel on the stator to connect to an inner space.   
     
     
         20 . The vertical submerged pump for chemical application according to  claim 19 , wherein, the stator is provided with an outer cylindrical part of the stator, the out cylindrical surface has a screw part, stator could be tied in an inner surface of a pump casing by the screw.