US20120128517A1

US20120128517A1 - Compressor pump for a sprayer

Info

Publication number: US20120128517A1
Application number: US12/953,423
Authority: US
Inventors: Jui-Chang Wu
Original assignee: SK&Y Agricultural Equipments Co Ltd
Current assignee: SK&Y Agricultural Equipments Co Ltd
Priority date: 2010-11-23
Filing date: 2010-11-23
Publication date: 2012-05-24

Abstract

A compressor pump for a sprayer comprises a pump, a piston and a connecting rod. The pump comprises a containment space, an opening formed at a bottom thereof and a plurality of through holes connected to the containment space at an upper portion thereof. The piston is disposed through the opening of the pump in the containment space, and the piston has a plurality of oil slots formed around an outer periphery, a sealing ring and an O ring jacketed onto the outer periphery, and an assembling portion with an internal thread formed inside of the piston. The elongated connecting rod has a connecting portion at each end respectively pivoted to a connecting member and a crank via respective axis hitches, such that the connecting member and the crank are capable of performing reciprocating (biased) movements at two ends of the connecting rod.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a compressor pump for a sprayer, and more particularly to a compressor pump for a sprayer which has lower assembly costs and increased assembly convenience and safety features.
2. Description of the Related Art
Currently, a compressor pump for a sprayer, with reference to FIGS. 6 and 7, comprises a pump 50, a piston 60 and a connecting rod 70. A containment space 51 is formed within the pump 50, and a slot 52 is axially formed at a bottom edge thereof. The piston 60 is disposed in the pump 50; the piston 60 internally has an assembling portion 61, and the assembling portion 61 has two securing columns 611 at two sides. The sidewalls of the piston 60 facing the securing columns 611 have respective through apertures 62. The connecting rod 70 is composed of two interlocked engaging members 71, and each end of the engaging members 71 respectively includes a fastening portion 711. One end of the connecting rod 70 is attached onto the crank 72, and another end is attached onto the assembling portion 61 of the piston 60. When the connecting rod 70 is coupled to the piston 60, one side of the connecting rod 70 is fastened to the crank 72, and another side is placed in the piston 60 and adjacent to the securing columns 611 of the assembling portion 61. With a suitable tool being inserted through the through aperture 62 of the piston 60, the engaging member 71 utilizes the fastening portion 711 to secure onto the securing columns 611 of the assembling portion 61.
For actual operations, please refer to FIGS. 8 and 9. The crank 72 connected to the connecting rod 70 at one end is connected to an activating member 73 at another end. Movement generated by the activating member 73 achieves pressure compression effects. When the activating member 73 is rotated, the crank 72 is driven to pass through the slot of the pump 50 and pushes the connecting rod 70 to cause the piston 60 to generate repeated strokes within the pump 50.
However, the prior art has the following drawbacks: 1. When the piston 60 is driven by the connecting rod 70, the connecting rod 70 needs to pass through the slot 52 of the pump 50 to enter into the containment space 51. Therefore, during repeated movements, the connecting rod 70 and the crank 72 tend to hit the piston 60, and the piston 60 is then inclined and damages the inner sidewall of the containment space 51 of the pump 50 which can cause leakage. 2. The crank 72 of the connecting rod 70 is engaged with one end of the two engaging members 71, and then another end of the engaging member 71 is assembled with the assembling portion 61 of the piston 60. The engaging member 71 needs to be placed in the piston 60, adjacent to the securing column 611 of the assembling portion 61, and a suitable tool inserted through the through aperture 62 to be secured, which is inconvenient. Moreover, with the through aperture 62, while the piston 60 is moving in the pump 50, lubrication oil can leak from the through aperture 62.
Therefore, it is desirable to provide a compressor pump for a sprayer to mitigate and/or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

An objective of the present invention is to provide a compressor pump for a sprayer
In order to achieve the above-mentioned objectives, a compressor pump for a sprayer comprises a pump, a piston and a connecting rod. The pump comprises a containment space, an opening formed at a bottom thereof and a plurality of through holes connected to the containment space at an upper portion thereof. The piston is disposed through the opening of the pump in the containment space, and the piston has a plurality of oil slots formed around an outer periphery, a sealing ring and an O ring jacketed onto the outer periphery, and an assembling portion with an internal thread formed inside of the piston. The elongated connecting rod has a connecting portion at each end respectively pivoted to a connecting member and a crank via respective axis hitches, such that the connecting member and the crank are capable of performing reciprocating (biased) movements at two ends of the connecting rod. Furthermore, a connecting end with an external thread corresponding to the assembling portion with the internal thread of the piston is formed at another end of the connecting member, and another end of the crank is pivoted to an activating member. The connecting member and the crank are respectively pivoted on the two ends of the connecting rod, and the connecting end at another end of the connecting member is assembled onto the assembling portion of the piston to connect the connecting rod to the piston. The piston is disposed in the containment space of the pump. The pump is installed in a sprayer, and the through holes are connected to an internal storage space.
With the above-mentioned embodiment structure the following benefits can be obtained: 1. The connecting rod of the piston is an elongated rod, and when the user operates the activating member, the rotation angle of the movements of the connecting rod is smaller, which generates substantial vertical movements, thus preventing the connecting rod from hitting against the piston, improving the stroke of the piston and creating more smooth movements. Furthermore, the piston is also prevented from shaking and rubbing against the inner sidewall of the containment space, which otherwise leads to cracking. 2. The connecting rod has the connecting member at one end attached to the piston, and the connecting end of the connecting member is screwed onto the assembling portion of the piston to simplify the assembly between the piston and the connecting rod.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an exploded view of the embodiment of the present invention.

FIG. 3 is a cross-sectional view of the embodiment of the present invention.

FIG. 4 is a movement schematic drawing of the embodiment of the present invention.

FIG. 5 illustrates use of the embodiment of the present invention.

FIG. 6 is an exploded view of a prior art device.

FIG. 7 is a cross-sectional view of the prior art.

FIG. 8 illustrates an upward pushing movement of the prior art.

FIG. 9 illustrates a downward pulling movement of the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Please refer to FIGS. 1, 2 and 3. A compressor pump for a sprayer comprises a pump 10, a piston 20 and a connecting rod 30. The pump 10 comprises a containment space 11, an opening 12 formed at a bottom thereof and a plurality of through holes 13 connected to the containment space 11 at an upper portion thereof. The piston 20 is disposed through the opening 12 of the pump 10 in the containment space 11, and the piston 20 has a plurality of oil slots 21 formed around an outer periphery, a sealing ring 22 and an O ring 23 jacketed onto the outer periphery, and an assembling portion 24 with an internal thread formed inside of the piston 20. The elongated connecting rod 30 has a connecting portion 31 at each end respectively pivoted to a connecting member 33 and a crank 34 via respective axis hitches 32, such that the connecting member 33 and the crank 34 are capable of performing reciprocating (biased) movements at two ends of the connecting rod 30. Furthermore, a connecting end 331 with an external thread corresponding to the assembling portion 24 with the internal thread of the piston 20 is formed at another end of the connecting member 33, and another end of the crank 34 is pivoted to an activating member 35.
For a complete assembly, please refer again to FIGS. 2 and 3. The connecting member 33 and the crank 34 are respectively pivoted on the two ends of the connecting rod 30, and the connecting end 331 at another end of the connecting member 33 is assembled onto the assembling portion 24 of the piston 20 to connect the connecting rod 30 to the piston 20. The piston 20 is disposed in the containment space 11 of the pump 10. The pump 10 is installed in a sprayer 40, and the through holes 13 are connected to an internal storage space 41, as shown in FIG. 5.
For actual operation, please refer to FIGS. 3, 4, and 5. To operate the sprayer 40, fluid is compressed within the storage space 41, and then spraying of the fluid spray is performed by release of this pressure. In order to compress the fluid, the activating member 35 extending from a side of the sprayer is rotated to drive the crank 34 to move the connecting rod 30 up and down, such that the piston 20 is driven by the connecting rod 30 to slide up and down in the containment space 11 of the pump 10 to continuously bring the fluid into the storage space 41 through the through holes 13 of the pump 10 and thereby increase the pressure maintained in the storage space 41 for spraying purposes.
With the above-mentioned embodiment structure the following benefits can be obtained: 1. The connecting rod 30 of the piston 20 is an elongated rod, and when the user operates the activating member 35, the rotation angle of the movements of the connecting rod 30 is smaller, which generates substantial vertical movements, thus preventing the connecting rod 30 from hitting against the piston 20, improving the stroke of the piston 20 and creating more smooth movements. Furthermore, the piston 20 is also prevented from shaking and rubbing against the inner sidewall of the containment space 11, which otherwise leads to cracking. 2. The connecting rod 30 has the connecting member 33 at one end attached to the piston 20, and the connecting end 331 of the connecting member 33 is screwed onto the assembling portion 24 of the piston 20 to simplify the assembly between the piston 20 and the connecting rod 30.
Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.

Claims

1. A compressor pump for a sprayer comprising:

a pump comprising a containment space, an opening formed at a bottom thereof and a plurality of through holes connected to the containment space at an upper portion thereof;

a piston disposed through the opening of the pump in the containment space, the piston having a plurality of oil slots formed around an outer periphery, a sealing ring and an O ring jacketed onto the outer periphery, and an assembling portion with an internal thread formed inside of the piston; and

an elongated connecting rod having a connecting portion at each end respectively pivoted to a connecting member and a crank via an axis hitch; a connecting end with an external thread corresponding to the assembling portion with the internal thread of the piston formed at another end of the connecting member; and another end of the crank pivoted to an activating member.