Patent Publication Number: US-9421564-B2

Title: Dispensing spray pump for fluid preparation

Description:
BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to a fluid pumping device, in particular to a dispensing spray pump for fluid preparation. 
     2. Description of Related Arts 
     A spray pumping device for fluid preparation has been widespread used in the fields of medical treatment, cosmetic, perfume, etc., for dispensing and squirting the fluid preparation to form a spray. The fluid dispensing pumps, disclosed as in patent number CN 200680044054.1, patent application number CN 200980126767.6 and patent application number 201110308177.4, mainly include a water core, a piston and a dispensing head, the water core includes a plunger and a pump body, the plunger is clogged at a dispensing hole of the dispensing head, and the pump body has a chamber and is provided with a secondary piston consisting of annular rings on the exterior surface; the piston is fixed to the bottle mouth of the reagent bottle with fluid preparation through a fixing ring, the piston can move forth and back in the chamber in a sealing manner, the secondary piston is slidably disposed in the dispensing chamber of the dispensing head; the chamber is communicated with the dispensing chamber, the piston is slid in the chamber to discharge the fluid preparation into the dispensing chamber, the hydraulic pressure of the dispensing chamber increases to push the secondary piston sliding in the dispensing chamber to coordinate the plunger for breaking away from the dispensing hole, thereby dispensing outward a dose of fluid preparation. 
     Although the fluid dispensing pump as described above may pump drugs well, the structure itself has certain design defects, such as: 
     First, the water core in the above fluid dispensing pump consists of a plunger and a pump body being integrally formed, thereby resulting in a water core with complex structure and longer size. The corresponding piston requires moving forth and back in the pump body, and then forms a hydraulic device by combining the pump body; therefore, the piston also requires a length being matched with the pump body. Since both the water core and the piston adopt injection molding process, the long size would increase the difficulty in injection molding and withdrawal in the case of the requirement of guaranteeing precision. 
     Second, in the above fluid dispensing pump, the piston needs to move forth and back in the pump body in a sealing manner, moreover, a starting air channel is required to reserve between the outer wall of the piston and the inner wall of the pump body while the piston achieves in sealed sliding, which undoubtedly further increases the required precision of the pump body and the piston during the machining process, and is not conducive to improve production efficiency. 
     Aiming at the above defects of the structure of the existing fluid dispensing pump in practice, it is necessary to make further improvement of the prior art. The present invention is an improvement approach with regard to the defects. 
     SUMMARY OF THE PRESENT INVENTION 
     The present invention provides a dispensing spray pump for fluid preparation, which is a device with the identical property of the traditional fluid dispensing pump. The main technical problem to be solved herein is that: since the existing fluid dispensing pumps have long size due to the defect of the structure, and need to reserve a starting air channel, the machining accuracy thereof is much higher, thereby increasing the machining difficulty. The above are the main technical problems to be solved in the present invention. 
     In order to solve the above technical problems, the technical solution adopted in the present invention is that: the present invention provides a dispensing spray pump for fluid preparation, which is arranged at a liquid storage bottle filling with the fluid preparation, including a piston body, a pump body, a plunger and a dispensing head, the piston body is fixedly arranged at the bottle mouth of the liquid storage bottle through a sealed cap, the piston body includes a first piston and a second piston, which are barrel-shaped and arranged in an identical axial direction, the first piston is located inside the second piston, the bobbin of the first piston is in communication with an immersed tube, the ends of the first piston and the second piston are enclosingly connected one another, a chamber with an enclosing bottom is formed between the outer wall of the first piston and the inner wall of the second piston; the pump body includes a first pump body and a second pump body, which are barrel-shaped and arranged in an identical axial direction, the first pump body is located inside the second pump body, the first pump body and the second pump body are fixedly connected to one another via a radial grid, and there is a fluid channel between the outer wall of the first pump body and the inner wall of the second pump body; the first piston and the second piston are slid in the first pump body and the second pump body in a sealed manner, respectively, the first pump body is provided with a check valve, a first chamber is formed between the check valve and the first piston in the first pump body, the check valve can only open outward unidirectionally from the first chamber, the depth from the chamber mouth of the first chamber to the check valve is less than the maximum stroke of the first piston, as the first piston reaches the top dead centre, it enables to lift the check valve, the bobbin of the first pump body is inserted in the chamber between the second piston and the first piston, the external diameter of the first pump body is less than the inner diameter of the second piston, the second piston is slid in the fluid channel located between the first pump body and the second pump body, the chamber with an enclosing bottom is in communication with the fluid channel to form a second chamber; an end of the plunger is fixedly inserted in the other end of the second pump body that is corresponding to the second piston, the plunger is provided with an communicating hole that is in communication with the second chamber. 
     Preferably, an outer axial surface of the pump body is provided with a secondary piston with an annular ring shape, a dispensing chamber is surrounded by the secondary piston, the outer wall of the plunger and the inner wall of the dispensing head, the communicating hole of the plunger is in communication with the second chamber and the dispensing chamber. 
     Preferably, the dispensing head is a nozzle suitable for the human nose, the top of the dispensing head is provided with a dispensing hole that is in communication with the inner chamber and the outer of the dispensing head, the pump body and the plunger are arranged axially and slid in the dispensing head, the plunger is arranged in the dispensing head and is located in the upstream of the dispensing hole, and is movable between the closed position and the open position of the dispensing hole, the pump body is kept by an elastic component to push the plunger to clog at the closed position of the dispensing hole. 
     Preferably, the dispensing chamber is provided with a bushing therein at the position corresponding to the plunger, the plunger is slidably inserted in the bushing, the bushing is interference fit with the inner wall of the dispensing head, a fixed spray-typed unit is reserved between the top of the bushing and the dispensing hole, the top of the bushing is provided with a discharge hole, which is in communication with the dispensing chamber and the spray-typed unit, the plunger keeps and clogs the discharge hole under the action of the elastic component. 
     Compared to the prior art, the beneficial effects generated by the present invention is that: the present invention provides a dispensing spray pump for fluid preparation, which, in practice, divides the water core component in the dispensing pump into a pump body and a plunger, which can be injection molding respectively to simplify the various difficulties in the integrated manufacturing process. Besides, by arranging the check valve in the first pump body of the pump body, the invention lifts the check valve through the upstream of the first piston, and achieves in discharging the starting air in the pump body to the liquid storage bottle through the bobbin of the first piston and the immersed tube, thereby omitting the structure to reserve the starting air channel, simplifying the processing technology, which enables to effectively improve production efficiency. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional schematic view of the present invention. 
         FIG. 2  is a cross-sectional schematic view of a start-up exhaust condition of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, the dispensing spray pump for fluid preparation provided by the present invention will be described in more details by combining with the  FIGS. 1 to 2 , and the preferred embodiment. 
     As shown in  FIGS. 1 and 2 , the present invention provides a dispensing spray pump for fluid preparation, which is arranged at a liquid storage bottle  1  filled with the fluid preparation, including a piston body  10 , a pump body  20 , a plunger  30  and a dispensing head  40 , characterized in that: 
     The piston body  10  is fixedly arranged at the bottle mouth of the liquid storage bottle  1  through a sealed cap  2 , the piston body  10  includes a first piston  11  and a second piston  12 , which are barrel-shaped and arranged in an identical axial direction, the first piston  11  is located inside the second piston  12 , the bobbin of the first piston  11  is in communication with an immersed tube, the ends of the first piston  11  and the second piston  12  are enclosingly connected to one another, a chamber  13  with an enclosed bottom is formed between the outer wall of the first piston  11  and the inner wall of the second piston  12 . 
     The pump body  20  includes a first pump body  21  and a second pump body  22 , which are barrel-shaped and arranged in an identical axial direction, the first pump body  21  is located inside the second pump body  22 , the first pump body  21  and the second pump body  22  are fixedly connected to one another via a radial grid  23 , and there is a fluid channel  24  between the outer wall of the first pump body  21  and the inner wall of the second pump body  22 . 
     The first piston  11  and the second piston  12  are slidable in the first pump body  21  and the second pump body  22  in a sealed manner, respectively; the first pump body  21  is provided with a check valve  25 , a first chamber  211  is formed between the check valve  25  and the first piston  11  in the first pump  21 , the check valve  25  can only open outward unidirectionally from the first chamber  211 , the depth from the chamber mouth of the first chamber  211  to the check valve  25  is less than the maximum stroke of the first piston  11 , as the first piston  11  reaches the top dead centre, it enables to lift the check valve  25 , the bobbin of the first pump body  21  is inserted in the chamber  13  between the second piston  12  and the first piston  11 , the external diameter of the first pump body  21  is less than the inner diameter of the second piston  21 , the second piston  12  is slid in the fluid channel  24  located between the first pump body  21  and the second pump body  22 , the chamber  13  with an enclosed bottom is in communication with the fluid channel  24  to form a second chamber. 
     An outer axial surface of the pump body  20  is provided with a secondary piston  26  with an annular ring shape, a dispensing chamber  41  is surrounded by the secondary piston  26 , the outer wall of the plunger  30  and the inner wall of the dispensing head  40 . 
     An end of the plunger  30  is fixedly inserted in the other end of the second pump body  22  that is corresponding to the second piston  12 , the plunger  30  is provided with a communicating hole  31  that is in communication with the second chamber, the communicating hole  31  is in communication with the second chamber and the dispensing chamber  41 . 
     The dispensing head  40  is a nozzle suitable for the human nose, the top of the dispensing head  40  is provided with a dispensing hole  42  that is in communication with the inner chamber and the outer of the dispensing head  40 , the pump body  20  and the plunger  30  are arranged axially and slidable in the dispensing head  40 , the plunger  30  is arranged in the dispensing head  40  and is located in the upstream of the dispensing hole  42 , and is movable between the closed position and the open position of the dispensing hole  42 , the pump body  20  is kept by an elastic component  3  to push the plunger  30  to clog at the closed position of the dispensing hole  42 . 
     When in practice, the present invention divides the water core component in the dispensing pump into a pump body  20  and a plunger  30 , which can be injection molding respectively to simplify the various difficulties in the integrated manufacturing process. Besides, by arranging the check valve  25  in the first pump body  21  of the pump body  20 , the invention lifts the check valve  25  through the upstream of the first piston  11 , and achieves in discharging the starting air in the pump body  20  to the liquid storage bottle  1  through the bobbin of the first piston  11  and the immersed tube, thereby omitting the structure to reserve the starting air channel, simplifying the processing technology, which enables to effectively improve production efficiency. 
     Preferred embodiment: the dispensing chamber  41  is provided with a bushing  50  therein at the position corresponding to the plunger  30 , the plunger  30  is slidably inserted in the bushing  50 , the bushing  50  is interference fit with the inner wall of the dispensing head  40 , a fixed spray-typed unit  43  is reserved between the top of the bushing  50  and the dispensing hole  42 , the top of the bushing  50  is provided with a discharge hole  51 , the discharge hole  51  is in communication with the dispensing chamber  41  and the spray-typed unit  43 , the plunger  30  keeps and clogs the discharge hole  51  under the action of the elastic component  3 . 
     To sum up, the technical solution of the present invention can sufficiently and effectively accomplish the object of the above invention, and the structure principle and the function principle of the invention have been sufficiently verified in the embodiment to achieve the expected effect and object. The embodiment of the present invention may be changed according to the principle; therefore, the invention includes all alternative contents referred in the application patent&#39;s scope. Any equivalent change on basis of the application patent&#39;s scope belongs to the scope of the present patent application.