Airflow passage structure of manual pump of fluid-pumping apparatus

Abstract

An airflow passage structure of manual pump of fluid-pumping apparatus includes a first control valve and a second control valve. The first and second control valves are movable between different positions to change flowing path of air so as to increase or decrease the air pressure in the chamber of a container of the fluid-pumping apparatus. In a relief operation mode, the air in the chamber is guided to go into a first compartment of the interior space of the manual pump and then go into a second compartment thereof to be exhausted into the atmosphere. On the other hand, in a pressurization operation mode, the communication between the chamber and the first compartment is interrupted and the air goes into the second compartment and then is pressurized and filled into the chamber to increase the pressure in the chamber.

1 . An airflow passage structure of manual pump of fluid-pumping apparatus, comprising:
 a container having a main body, a chamber with an open top end being formed in the main body, a cover section being disposed at the open end of the chamber to seal the chamber;   a manual pump having a tubular body, a piston member being slidably disposed in the tubular body to partition an interior space of the tubular body into a first compartment and a second compartment, the piston member being reciprocally movable along an axis of the tubular body to make the capacities of the first and second compartments grow and decline, a pull stem being coaxially disposed in the tubular body, one end of the pull stem being connected with the piston member, the other end of the pull stem extending through the cover section to an outer side of the tubular body;   a flow passage section including an in-stem flow passage formed in the pull stem and extending along an axis of the pull stem, an opening of the in-stem flow passage at one end of the pull stem communicating with the second compartment, the in-stem flow passage communicating with the atmosphere via an air outlet flow passage, a valve hole being formed in the cover section, one end of the valve hole communicating with the first compartment, an extension flow passage communicating the second compartment with the valve hole, the air being only permitted to one-way flow from the second compartment through the extension flow passage to the valve hole, a connection flow passage communicating the valve hole with the chamber;   a first control valve movable between a first position and a second position, when positioned in the first position, the first control valve interrupting communication between the air outlet flow passage and the in-stem flow passage, when positioned in the second position, the first control valve permitting communication between the air outlet flow passage and the in-stem flow passage; and   a second control valve movable between a pressurization position and a relief position, when positioned in the pressurization position, the connection flow passage communicating with the second compartment via the extension flow passage, when positioned in the relief position, the connection flow passage communicating with the first compartment via the valve hole.   
     
     
         2 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 1 , wherein the flow passage section further includes a one-way valve disposed in the extension flow passage for restricting flowing direction of the air. 
     
     
         3 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 1 , wherein the manual pump further includes a pull handle fixedly connected to the other end of the pull stem, the air outlet flow passage inward extending from one end of the pull handle in communication with the in-stem flow passage. 
     
     
         4 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 1 , wherein the first control valve has a first valve body having a cylindrical form, the first valve body being movable between the first and second positions, a flow guide space being formed on the first valve body, when the first control valve is positioned in the second position, the air outlet flow passage communicating with the in-stem flow passage via the flow guide space. 
     
     
         5 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 4 , wherein the manual pump further includes a pull handle fixedly connected to the other end of the pull stem, the air outlet flow passage inward extending from one end of the pull handle in communication with the in-stem flow passage, the first valve body being rotatably disposed in the pull handle. 
     
     
         6 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 1 , wherein the valve hole is formed in the cover section and the second control valve is fitted in the valve hole. 
     
     
         7 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 6 , wherein the second control valve has a second valve body having a cylindrical form, one end of the second valve body being coaxially fitted in a part of the valve hole, the second valve body being rotatable between the pressurization position and the relief position. 
     
     
         8 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 7 , wherein the second control valve further has a pressurization flow passage in the form of a channel, the pressurization flow passage being formed on a circumference of the second valve body, a relief flow passage in the form of a tunnel being formed in the second valve body and inward axially extending from one end of the second valve body, a radial opening being formed on the second valve body in a position in alignment with the connection flow passage, whereby when the second control valve is positioned in the pressurization position, the connection flow passage communicates with the extension flow passage via the pressurization flow passage and when positioned in the relief position, the connection flow passage communicates with the other part of the valve hole via the relief flow passage. 
     
     
         9 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 1 , wherein the second control valve is further movable to a closed position, when positioned in the closed position, the second valve body of the second control valve blocks both the connection flow passage and the extension flow passage. 
     
     
         10 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 9 , wherein the second control valve has a second valve body having a cylindrical form, one end of the second valve body being coaxially fitted in a part of the valve hole, the second valve body being rotatable between the pressurization position, the relief position and the closed position, the second control valve further having a pressurization flow passage in the form of a channel, the pressurization flow passage being formed on a circumference of the second valve body, a relief flow passage in the form of a tunnel being formed in the second valve body and inward axially extending from one end of the second valve body, a radial opening being formed on the second valve body in a position in alignment with the connection flow passage, whereby when the second control valve is positioned in the pressurization position, the connection flow passage communicates with the extension flow passage via the pressurization flow passage and when positioned in the relief position, the connection flow passage communicates with the other part of the valve hole via the relief flow passage and when positioned in the closed position, the second valve body of the second control valve blocks both the connection flow passage and the extension flow passage. 
     
     
         11 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 1 , wherein the connection flow passage includes a first subsidiary connection flow passage and a second subsidiary connection flow passage in communication with the valve hole and the chamber respectively, when the second control valve is positioned in the relief position, the second subsidiary connection flow passage being blocked and the first subsidiary connection flow passage communicating with the first compartment via the valve hole, when the second control valve is positioned in the pressurization position, the first subsidiary connection flow passage being blocked and the second subsidiary connection flow passage communicates with the second compartment via the extension flow passage, whereby the air can one-way flow from the second compartment through the extension flow passage and the second subsidiary connection flow passage into the chamber. 
     
     
         12 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 11 , wherein the valve hole is formed in the cover section and the second control valve is fitted in the valve hole. 
     
     
         13 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 12 , wherein the second control valve has a second valve body having a cylindrical form, one end of the second valve body being coaxially fitted in a part of the valve hole, the second valve body being rotatable between the pressurization position and the relief position. 
     
     
         14 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 13 , wherein the second control valve further has a pressurization flow passage in the form of a channel, the pressurization flow passage being formed on a circumference of the second valve body, a relief flow passage in the form of a tunnel being formed in the second valve body and inward axially extending from one end of the second valve body, a radial opening being formed on the second valve body in a position in alignment with the connection flow passage, whereby when the second control valve is positioned in the pressurization position, the second subsidiary connection flow passage communicates with the extension flow passage via the pressurization flow passage and when positioned in the relief position, the first subsidiary connection flow passage communicates with the other part of the valve hole via the relief flow passage. 
     
     
         15 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 11 , wherein the second control valve is further movable to a closed position, when positioned in the closed position, the second valve body of the second control valve blocks both the first and second subsidiary connection flow passages and the extension flow passage. 
     
     
         16 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 15 , wherein the second control valve has a second valve body having a cylindrical form, one end of the second valve body being coaxially fitted in a part of the valve hole, the second valve body being rotatable between the pressurization position, the relief position and the closed position, the second control valve further having a pressurization flow passage in the form of a channel, the pressurization flow passage being formed on a circumference of the second valve body, a relief flow passage in the form of a tunnel being formed in the second valve body and inward axially extending from one end of the second valve body, a radial opening being formed on the second valve body in a position in alignment with the connection flow passage, whereby when the second control valve is positioned in the pressurization position, the second subsidiary connection flow passage communicates with the extension flow passage via the pressurization flow passage and when positioned in the relief position, the first subsidiary connection flow passage communicates with the other part of the valve hole via the relief flow passage and when positioned in the closed position, the second valve body of the second control valve blocks both the first and second subsidiary connection flow passages and the extension flow passage. 
     
     
         17 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 8 , wherein the flow passage section further includes an air inlet formed on the cover section in communication with the atmosphere, when the second control valve is positioned in the pressurization position, the air inlet communicating with the other part of the valve hole via the relief flow passage, while when positioned in the relief position, the communication between the air inlet and the other part of the valve hole being interrupted by the second valve body. 
     
     
         18 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 10 , wherein the flow passage section further includes an air inlet formed on the cover section in communication with the atmosphere, when the second control valve is positioned in the pressurization position, the air inlet communicating with the other part of the valve hole via the relief flow passage, while when positioned in the relief position, the communication between the air inlet and the other part of the valve hole being interrupted by the second valve body. 
     
     
         19 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 14 , wherein the flow passage section further includes an air inlet formed on the cover section in communication with the atmosphere, when the second control valve is positioned in the pressurization position, the air inlet communicating with the other part of the valve hole via the relief flow passage, while when positioned in the relief position, the communication between the air inlet and the other part of the valve hole being interrupted by the second valve body. 
     
     
         20 . The airflow passage structure of manual pump of fluid-pumping apparatus as claimed in  claim 16 , wherein the flow passage section further includes an air inlet formed on the cover section in communication with the atmosphere, when the second control valve is positioned in the pressurization position, the air inlet communicating with the other part of the valve hole via the relief flow passage, while when positioned in the relief position, the communication between the air inlet and the other part of the valve hole being interrupted by the second valve body.