CA2012468C - Pump assembly - Google Patents
Pump assemblyInfo
- Publication number
- CA2012468C CA2012468C CA 2012468 CA2012468A CA2012468C CA 2012468 C CA2012468 C CA 2012468C CA 2012468 CA2012468 CA 2012468 CA 2012468 A CA2012468 A CA 2012468A CA 2012468 C CA2012468 C CA 2012468C
- Authority
- CA
- Canada
- Prior art keywords
- container
- liquid
- pump
- slanted
- gasket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Jet Pumps And Other Pumps (AREA)
- Reciprocating Pumps (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
A pump assembly for storing and discharging a liq-uid such as a chemical solution includes a substantially cylindrical container for storing the liquid therein, a pump mounted on one end of the container and having a suction port for drawing the liquid from the container and an outlet port for discharging the liquid, and a gasket slidably inserted in the opposite end of the container in contact with the liquid stored in the container, for sealing the liquid in the container, the gasket being slidable toward the pump when the liquid stored in the container is reduced by the pump. A slanted portion is disposed in said one end of the container and has a slanted surface extending contin-uously from an inner peripheral surface of the container and converying away from the gasket. The suction port of the pump communicates with the interior space of the container substantially at a converging end of the slanted surface.
Any trapped air is collected between the slanted surface and the liquid contained in the container, and can be discharged from the container by the pump before the liquid is dis-charged from the container by the pump.
Any trapped air is collected between the slanted surface and the liquid contained in the container, and can be discharged from the container by the pump before the liquid is dis-charged from the container by the pump.
Description
PUMP ASSEMBLY
BACKGROUND OF THE INVENTION
The present invention relates to a pump assembly which has a container Eor storing a liquid such as a cheml~
cal solution in isolation from ambient air so that the .stored liqu:Ld will be protected from being modified, e.g., oxidi~ed, and which can discharge the stored liquld from khe contalner while the liquld :Ls belng isolated Erom amblen-t air.
One known pump assernbly is shown in FIG. 5 of the accompanying drawings.
The pump assembly shown ln FIG. 5 comprises a sub-stantially cylindrical container a with open opposite ends, a pump b mounted in the upper end of the container a, and a gasket c slidably inserted in the other bottom end of the container a. wi-th the pump b mounted in the upper end of the container a, a li~uid X such as a chemical solution is filled in the contalner a through the bottom end thereof, and thereafter the gasket c is inserted into the container a until the gasket c contacts the surface oE the li~uid X.
The li~uid X is now sealed in the container a ln lsolation frorn ambient air. Af-ter the liquid X ls sealed in the con-tainer a, the bottom end of the con-tainer a is closed by an air-permeable bottom l:Ld d.
The pump b rnay be a pump disclosed in Japanese Laid-Open Patent Publication No. 61(1986)-263668, for . -- 1 --:.
j .
.. . . . .. ... . .. .... . . . . ... .. . . . . . . .
example. When a presser e of the pump b is pressed by a finger, the pump b draws in the liquid X from the container a through a suction port f and e~ects the liquid X ~rom an outlet port ~. The suction port f of the pump b which is installed in the upper end of the container a extends through a neck h on the upper end thereof and is immersed in , the liquid X.
; When the liquid X ln the container a is drawn and e~ected out oE the container a by the pump b, the gasket c slides toward the pump b while in contact with the surface of the liquid X as the amount of the s-tored liquid X is , progresslvely reduced. Therefore, the liquid X stored in the container a remains sealed, l.e., in isolakion from the ambient air, and is prevented from being modified, e.y., ' oxidized by contact with the ambient air.~
- While the liquid x sealed in the container a ', remains isolated ~rom the ambient air, air often tends to '' flow into the ccntainer a when the liquid X is introduced " into the container a. The air Y, which enters into the con~
tainer a when the liquid X is filled, is trapped between the suc-tion port f of the pump b and the neck h, and cannot easily removed from the container,a after the liquid X has been sealed in the container a.
ThereEore, the liquid X in the contalner a rnay be oxidlzed by the trapped alr Y. To prevent such oxld:lzat:Lon of the, liquld X, :lt has been necessary to replace the air X
.~
, - 2 -with a nitrogen gas when the liquid X is sealed. Such a replacing procedure is however tedious and time-consumin~.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a pump assembly for e~ecting a liquid such as a chemical solution frorn a con-tainer while isolatiny the liquid from arnbien-t air, the pump assembly having a mecha.nisrn which can easily remove air, which ls trapped in the container when khe liquid is ~illed and sealed in the container, from the container a~-ter the liquid is sealed in the con-tainer.
According to the present invention, there is pro-vided a pump assembly comprising a subs-tantially cylindrical container for storing a liquid therein, the container having open opposite ends, a pump mounted on one end of the con-tainer and having a suction port for drawing the liquid from the container and an outlet port for discharging the liquld, a gasket slidably inserted in the opposite end of the con-tainer in contact with the llquld stored in the container, for sealing the liquid in the container, the gasket being slidable toward the pump when the liquid stored in the con-tainer is reduced by -the pump, and a slanted portion dis-posed in the one end oE the container and havlng a slan-ted surface extending continuously from an inner peripheral sur-face oE the container and converging away frolll the gasket, t.he suctlon port of the pwnp comrnunlcating with the interior space of the container substantially at a converging end of the slanted surface.
~2~c~1 The pUlllp assembly further comprises an inner plug inser-ted in the one end of the container, the slanted por-tion being disposed on an end of the inner plug which faces lnto the container.
The slanted portlon has a pro~ection pro~ecting outwardly from the container subs-tan-tially at the converging end, the suc-tlon port being fikted over the pro;ection, the pro;ection haviny a through hole, the suction port communl-catirlg with the in-ter:Lor space of the container through the through hole.
The slanted surface is substantially co~ically shaped.
According to the present invention, there is also provided a pump assembly comprising a substantially cylin-drical container for storing a llquid therein, the container having open opposite ends, a pump mounted on one end of the container and having a suction port for drawing the liquid from the container and an outlet port for discharging the liquid, a gasket slidably inserted in the opposite end of the container in contact wlth the liquid stored in the container, for sealing the liquid in the container, the gas-lcet being slidable toward the pump when the liquid stored in the container i.9 gradually discharged ou-t by the pump, and a slantec] portion disposed in and integral with the one end of the container arld havirlg a subs-tantially conlcal slanted sur:Eace extending continuously from an lnner peripheral sur-face of the container and converging away from -the gaske-t, the slanted portion having a projection projecting outwardly from the container substantially at a converging end oE the slanted surface, the projection havlng a through hole commu-ni.catlng wlth the interior space of the container, the suc-tion por-t belng fitted in the through hole such that a tip end of the suction port lies substantially flush with the converging erld oE the slan-ted surface.
Accordlng to the present inven-tlon, there is ~ur-ther provided a purnp assembly comprising a substantially cyJ.indrical container for storlng a llquid therein, the con-tainer having open opposlte ends, a pump mounted on one end of the contalner and having a suction port for drawing the liquid ~rom the container and an outlet port for discharging the liquid, a gasket slidably inserted in;the opposite end of the container in contact with the liquid stored in the container, for sealing the liquid ln -the container, the gas-~et being slidable toward the pump when the liquid s-tored in the container is gradually discharged out by the pump, and an inner plug fitted in the one end of the container, the inner plug havlng a slanted portion dispcsed in an end thereo~ which faces in-to the container and having a substan-I:lally conical slanted surface extending contlnuously ~rom an inner peripheral surEace oE the contalner and converginy away Erorn the gaske-t, and a projecti~n pro~ecting outwardly frorn-the container substantially at a converglng end of the .! . . . . .. . . . .
slanted surface, the projection having a through hole coimnu-nicating with the interior space of the container, the suc-tion port being Eitted over -the projec-tion and cornmunicating with the interior space of the con-tainer.
IE air enters the container when the liquid is filled and sealed in the container, then the air is trapped betwe0n the slanted sur~ace and the llquid in the container and collected along the slanted surface into a region near the converying end o~ the slanted surface when the con-tainer is turned upside down so that the purnp is directed upwardly after the liquid is sealed in the con-tainer. At thls time, the tip end of the suction port faces the liquid in the con-tainer across the air substantially at the converging end of the slanted surface. When the pump is actuated, the air is drawn along the slanted surface into the~suction port and then discharged from the outlet port. Thereafter, the liq-uid stored in the container is drawn into the suctlon port and discharged from the outlet port. As the liquid is grad-ually discharged out of the container, the gasket is caused to slide toward the pump while in con-tac-t with the s-tored liquid, which is therefore kept in isolation frorn ambien-t air.
There~ore, any air whlch ls trapped ln th0 con-talner can easily be removed froln the container when the pump ls operated aEter -the llquid is sealed in -the container. Accordin~ly, the liquid sealed in the container can be s-tored in the container withou-t being contacted by air.
If the slanted por;tion is provided by the inner plug to be inserted in the end of the con-tainer on which the pump ls mounted, then the pump assembly of the lnvention can be used with any of various containers when the inner plug is fitted in the end of the container used. ~herefore, any -trapped alr can be removed by the pump from any of th~se various containers.
I the suc-tion port of the pump is fitted over the pro~ectlon pro~ecting outwardly from the container substan-tially ak the converging end of the slanted surface and ls held in communlcation with the interior space of the con-tainer through the through hole defined in the pro~ection, then since the tip end of the suction port is isolated from the interior space of the container by the slanted portion, the tip end of the suction port is prevented from contacting the llquid in the container before the trapped air is com-pletely drained from the container. Conse~uently, the air trapped in the container can fully be removed.
The slanted surface which is substantially conical in shape may easily be formed in-tegrally wi-th the container or the inner plug.
The above and other objec-ts, features and advan tages of the presen-t invention will become more apparent from the foL:Lowing descriptlon when taken in con~unctlon .
wi-th the accompanying drawings in which preferred embodi-ments of the present invention are shown by way of illustra-tive example.
BRIEE' DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross-sectional view of a pump assembly according to an embodiment oE the present inventlon;
FIG. 2 is a fragmentary, partly exploded cross-sectional view showing the manner in which a liquid is Eilled and sealed in the con-tainer of -the pump assembly shown ln FIG. l;
FIG. 3 is a longitudinal cross-sectiorlal vlew o~ a pump assembly according to another embodiment of the present 1nvention;
FIG. 4 1s a fragmentary, partly exploded cross-sectional yiew showing the manner in which a liquid is filled and sealed in the container of the pump assembly shown in FIG. 3; and FIG. 5 is a longitudinal cross-sectional view of a conventional pump assembly.
DETAIEED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As shown in FIG. 1, a pump assembly according -to an ernbodiment oE the present invention comprises a substarl-ti.ally cylindrical contalner 1 w:lth open opposite ends, a pWllp 2 mounted on one end (hereirlaEter re~erred to as an "upper end") of -the container 1 through an adapter 3, for - B -%~3~2~
drawing and ejecting a liquid X which is Ellled in the con-tainer 1, a gaske-t 4 slidably inserted ln the other end (hereinafter referred to as a ~'bottom end") of the contalner 1 whlch is fllled with the liquid X, and a bottom lid 5 fit-ted in the bottom end of the container 1 in which the gasket 4 is inser-ted. The bottom lid 5 has a ven-t hole 6 through which a space between the bot-tom lid 5 and the gasket 4 com-munlcates wlth the ex-terior space of the container 1.
The container 1 has a substan-tially conical slanted portion 7 on l-ts upper end, the slanted portion 7 being concen-tric with a barrel portion of the container 1. The slanted portion 7 has an inner slanted surface B which extends continuously from the inner peripheral surface oE
the barrel portion of the container 1 and converges upwardly into a pro;ection 9 projecting upwardly from the center of the upper surface of the slanted portion 7. The projection g has a vertical through hole 10 communicating with the interior space oE the container lo The adapter 3 is in the form of a hollow cylinder comprising a larger-diameter portion 11 which is of substan-tially the same diameter as the container 1 and a smaller-diameter portion 12 joined concentrically to the larger-diarneter porkion 11 and having a diameter smaller than the diame-ter oE the larger-diameter portlon 1].. The larger~d:Lameter porkion 11 is threaded over an externally threaded annular wall 13 disposed on and ex~-tending around 2~
the slante~ portion 7. ~he projection ~ is concen-trically positioned in the larger-diameter portion 11. The pump 2 has a cylindrical case 14 concentrically threaded over the smaller-diarneter portion 12 of the adapter 3. In th~s manner,. the pump 2 is mounted on the upper end of the con-tainer 1.
The pump 2 is of a construction which is basically the sarne aæ the pump disclosed in Japanese Laid-Open Patent Publi.cation Mo. 61(1986)-263668. The pump 2 has a verti-cally movable presser 5 pro~ecting upwardly from the upper end of the case 1~, a suction port 17 integral with the lower distal end o~ a cylinder 16 which is fixed to the case ~ and extends concentrically downwardly from within the case 14, and an outlet port 18 extending laterally from the upper end of the presser 15. The suction port 17 is inserted in the through hole 10 in the pro~ection 9 such that the lower tip end of the suction port 17 lies flush with the converging end of the slanted surface 8 of the slanted portlon 7. The presser 15 is normally urged to move upwardly by a spring 19 disposed in the cylinder 16. The cylinder 16 defines therein a pump chamber 20 which can be pressurized when the presser 15 is depressed. The interior space of the outlet port 18 comm~ln-lcates with the pump cham~
ber 20 through a valve 21 which is opened when the presser 15 is depressed. The interior space of the suction port 17 communicates with the pump chamber 20 throuyh a valve 22 ~L2~6~3 which ls opened in response to a reduction in the pressure in the pump chamber 20 when the presser 15 returns to its original position under the bias of the spring 19.
When the presser 15 of the pump 2 is depressed by a finger and then released so as to return to its original position, the liquid X filled in the container 1 is drawn through the suction port 17 and the valve 22 into the pump chamber 20. When the presser 15 is depressed again, the liquid X which has been drawn into the purnp chamber 20 is e~ected out of the ou-tlet port 18 through the valve 21.
A process of filling and sealing the liquid X ln the container 1 wlll now be described with reference to FIGS. 1 and 2.
To flll and seal the liquid X in the container 1, the pump 2 ls mounted on the upper end of the container 1, and, thereafter the container 1 is turned upside down to direct the upper end thereof downwardly, as shown in FIG. 2.
Then, the liquid X is filled in the container 1 through the bottom end thereo~ which is now positioned upwardly.
Then, the gasket 4 is inserted into the container 1 through its bottom end until the gasket ~ is brought into contack with the surface of the liquid X. The liquid X-is now sealed in the container 1.
Subsequently, the bottom lid 5 is fit-ted into the bottom end of the container 1, thereby closing the bottom end. The con-tainer 1 is reversed again to direct its upper end upwardly, as shown in FIG. 1.
.
While -the liquid x is being filled and sealed in the container 1 as described above, air Y may be trapped in the container 1. When the upper end o~ the container 1 is direc-ted upwardly as shown in FIG. 1, the air Y which is trapped in the container 1 rises in the liquid X and is col-lected alony the slanted sur~ace 8 -toward the converging end thereof, i.e., irmnediately below the tlp end of the suction port 17 o~ the purnp 2. Therefore, the tlp end of the suc-tion port 17 does not directly contac-t the liquid X, but ~aces the liquid X through the trapped air Y.
Then, the presser 15 ls depressed and released so as to return to its original position. At this time, the air Y ls drawn along the slanted sur~ace 8 through the suc-tion port 17 into the pump chamber 20. When the presser 15 is depressed ayain, the trapped air ~ is dlscharged ~rom the pump chamber 20 through -the outlet port 18. This process is repeated to discharge the air Y gradually from within the slanted portion 7. The gasket 4, while being held in con-tact with the liquid X, is caused to slide in the container 1, ~orcing the liquid X toward the suction por-t 17. ~t the same time that the air Y is entirely removed ~rom within the slanted por-tion 7, the tip end o~ the suctlon port 17 con-tacts the llquid X in the con-talnér 1. ThereaE-ter, the liq-uld X is drawn from the suctlon port 17 and e~ected frorn the ou-tlet por-t 18. ~t this tlrne, the liquid X in -the container 1 :Ls sealed in the con-tainer 1 whlle beincJ isolated from, i.e., out oE contact wlth, -the ambient alr.
With the pump assembly of the present invention, after the liquid X is filled and sealed in the container 1, the pump 2 is operated to discharge the air Y which may be trapped in the container 1 when the liquid X is filled in the container 1. Therefore, the liquid X ls stored in the container 1 in isolatlon from the ambient alr, and can be discharged from the container 1 when necessary.
A pwnp assembly according to another embodiment of the present lnventiorl is shown in FIGS. 3 and 4.
As shown in FIG. 3, the pump assembly comprises a substantially cylindrical container 23 with open opposite ends, a pump 24 mounted on one end (hereinafter referred to as an "upper end") of the container 23 through a~ adapter Z5, a gasket 26 slidably inserted in the other end (hereinafter referred to as a "bottom end"~ of the contalner 23 which is filled with the liqu~d x, and a bottom lid 27 fitted in the bottom end of the container 1 ~n which the gasket 26 is inserted. The bottom lld 27 has a vent hole 28, as wlth the bottom lid 5 shown in FIG. 1.
The pump 24 is of the same structure as the pump 2, and has the presser 15, the suction port 17, and -the outlet port 18.
The upper end of the container 1 opens outwardly through a neck 29 whose diameter is slightly smaller than the diameter of the barrel portion o~ the container 1.
hollow inner plug 30 having an open upper end is inserted in ~ 13 ~
~ 2 -the neck 29. The inner plug 30 has a lateral Elange 30a on its upper end, which engages the upper end of the neck 29.
The inner plug 30 has a substantially conical slanted portion 31 on its lower end, the slanted portion 31 belng of the same configuration as the slanted portion 7 shown ln FIG. 1. With the inner plug 30 fitted ln the neck 29, the slanted portion 31 has an inner slanted surface 32 which extends continuously from the inner peripheral surface of khe barrel portion of the con-tainer 23 and the neck 29 and converges upwardly in-to a pro~ectlon 33 pro~ecting upwardly from the center o~ khe slanted por-tion 3i. The suctlon port 17 o~ the pump 24 is fitted over the pro~ection 33. The pro~ection 33 has a vertical through hole 34 commu-nicaking with the interior space of the container 23.
The adapter 25 is of the same profile as the adapter 3 shown in FIG. 1. The adapter 25 has a larger-diameter portion 35 whose lower portion is threaded over the neck 29 of the container 23, with the neck 29 and the inner plug 30 being concentrically disposed in the larger-diameter portion 35. The adapter 25 also has a smaller-diameter por-tion 36 concentrically threaded in the case 14 of the pump 24. In this manner, the pump 24 is mounted on the upper end of the container 23. The suction port 17 of the pwnp 24 is fi-tted over the pro~ection 33 such that the lower tlp end oE
the suction port 17 abu-ts against the upper surEace of the slanted portlon 31 subs-tantially near the converging end o~
the slanted surface 3 2.
'~
An annular member 37 is fixed to the upper inner peripheral surface of the larger-diameter portion 35 of the adapter 25. When the larger-diameter portion 35 is threaded over the neck 29, the annular member 37 and the neck 29 clamp the flange 30a therebetween, thereby securely holdlng the inner plug 30 in position.
To ~ill and seal the liquld X in the container 23, the inner plug 30 is fitted in -the neck 29. Then, the liq-uid X may be ~illed ln the container 23 -throuyh the bottom end thereo~ and khen sealed therein in the same manner as described with respect to the container 1 shown in FIG. 1.
Alternatively, as shown in FIG. 4, the gasket 26 is inserted in the bottom end of the container 23, and the bo-t-tom end thereof is closed by the bottom lid 27. Thereafter, t-he liquid X is filled in the container 27 through the neck 29 on the upper end thereof, after which the pump 24 is mounted on the upper end of the container 23 through the adapter 25, thus sealing the liquid x in the container 23.
If air Y is trapped in the container 23 when the liquid X is filled and sealed in the container 23, then the air Y is connected along the slanted surface 32 -toward a region directly below the suction port 17 oE the pump 2~.
The pump 24 is then actuated to draw the trapped air Y from the suction port 17 and dlscharge the air Y from the outlet : port 1~. The -trapped a:L.r Y can -there~ore be removed from the container 23.
2~
Slnce the tip end of the suction port 17 is iso-lated from the interior space of the container 23 by the slanted portion 31, the tip end of the suction port 17 is prevented from contacting the liquid x in the container 23, failing to remove any remaining trapped air Y, before the air Y is completsly dralned from the container 23.
Consequently, the air ~ trapped ln the container 23 can fully be removed.
The slanted portion 31 for collecting any trapped air Y lnto the region directly benea-th the suction port 17 : is provided by the lnner plug 30 which is fitted in the con-tainer 23. Therefore, the pump assembly shown in FIGS. 3 and 4 may bs lncorporated ln a contalner whlch has no slanted portlon on its upper end, as with the container 23, for the removal of trapped air.
: Although certain preferred embodiments have been shown and described, it should be understood that many changes and modifications may be made therein without departing from the scope of the appended claims.
.
I
BACKGROUND OF THE INVENTION
The present invention relates to a pump assembly which has a container Eor storing a liquid such as a cheml~
cal solution in isolation from ambient air so that the .stored liqu:Ld will be protected from being modified, e.g., oxidi~ed, and which can discharge the stored liquld from khe contalner while the liquld :Ls belng isolated Erom amblen-t air.
One known pump assernbly is shown in FIG. 5 of the accompanying drawings.
The pump assembly shown ln FIG. 5 comprises a sub-stantially cylindrical container a with open opposite ends, a pump b mounted in the upper end of the container a, and a gasket c slidably inserted in the other bottom end of the container a. wi-th the pump b mounted in the upper end of the container a, a li~uid X such as a chemical solution is filled in the contalner a through the bottom end thereof, and thereafter the gasket c is inserted into the container a until the gasket c contacts the surface oE the li~uid X.
The li~uid X is now sealed in the container a ln lsolation frorn ambient air. Af-ter the liquid X ls sealed in the con-tainer a, the bottom end of the con-tainer a is closed by an air-permeable bottom l:Ld d.
The pump b rnay be a pump disclosed in Japanese Laid-Open Patent Publication No. 61(1986)-263668, for . -- 1 --:.
j .
.. . . . .. ... . .. .... . . . . ... .. . . . . . . .
example. When a presser e of the pump b is pressed by a finger, the pump b draws in the liquid X from the container a through a suction port f and e~ects the liquid X ~rom an outlet port ~. The suction port f of the pump b which is installed in the upper end of the container a extends through a neck h on the upper end thereof and is immersed in , the liquid X.
; When the liquid X ln the container a is drawn and e~ected out oE the container a by the pump b, the gasket c slides toward the pump b while in contact with the surface of the liquid X as the amount of the s-tored liquid X is , progresslvely reduced. Therefore, the liquid X stored in the container a remains sealed, l.e., in isolakion from the ambient air, and is prevented from being modified, e.y., ' oxidized by contact with the ambient air.~
- While the liquid x sealed in the container a ', remains isolated ~rom the ambient air, air often tends to '' flow into the ccntainer a when the liquid X is introduced " into the container a. The air Y, which enters into the con~
tainer a when the liquid X is filled, is trapped between the suc-tion port f of the pump b and the neck h, and cannot easily removed from the container,a after the liquid X has been sealed in the container a.
ThereEore, the liquid X in the contalner a rnay be oxidlzed by the trapped alr Y. To prevent such oxld:lzat:Lon of the, liquld X, :lt has been necessary to replace the air X
.~
, - 2 -with a nitrogen gas when the liquid X is sealed. Such a replacing procedure is however tedious and time-consumin~.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a pump assembly for e~ecting a liquid such as a chemical solution frorn a con-tainer while isolatiny the liquid from arnbien-t air, the pump assembly having a mecha.nisrn which can easily remove air, which ls trapped in the container when khe liquid is ~illed and sealed in the container, from the container a~-ter the liquid is sealed in the con-tainer.
According to the present invention, there is pro-vided a pump assembly comprising a subs-tantially cylindrical container for storing a liquid therein, the container having open opposite ends, a pump mounted on one end of the con-tainer and having a suction port for drawing the liquid from the container and an outlet port for discharging the liquld, a gasket slidably inserted in the opposite end of the con-tainer in contact with the llquld stored in the container, for sealing the liquid in the container, the gasket being slidable toward the pump when the liquid stored in the con-tainer is reduced by -the pump, and a slanted portion dis-posed in the one end oE the container and havlng a slan-ted surface extending continuously from an inner peripheral sur-face oE the container and converging away frolll the gasket, t.he suctlon port of the pwnp comrnunlcating with the interior space of the container substantially at a converging end of the slanted surface.
~2~c~1 The pUlllp assembly further comprises an inner plug inser-ted in the one end of the container, the slanted por-tion being disposed on an end of the inner plug which faces lnto the container.
The slanted portlon has a pro~ection pro~ecting outwardly from the container subs-tan-tially at the converging end, the suc-tlon port being fikted over the pro;ection, the pro;ection haviny a through hole, the suction port communl-catirlg with the in-ter:Lor space of the container through the through hole.
The slanted surface is substantially co~ically shaped.
According to the present invention, there is also provided a pump assembly comprising a substantially cylin-drical container for storing a llquid therein, the container having open opposite ends, a pump mounted on one end of the container and having a suction port for drawing the liquid from the container and an outlet port for discharging the liquid, a gasket slidably inserted in the opposite end of the container in contact wlth the liquid stored in the container, for sealing the liquid in the container, the gas-lcet being slidable toward the pump when the liquid stored in the container i.9 gradually discharged ou-t by the pump, and a slantec] portion disposed in and integral with the one end of the container arld havirlg a subs-tantially conlcal slanted sur:Eace extending continuously from an lnner peripheral sur-face of the container and converging away from -the gaske-t, the slanted portion having a projection projecting outwardly from the container substantially at a converging end oE the slanted surface, the projection havlng a through hole commu-ni.catlng wlth the interior space of the container, the suc-tion por-t belng fitted in the through hole such that a tip end of the suction port lies substantially flush with the converging erld oE the slan-ted surface.
Accordlng to the present inven-tlon, there is ~ur-ther provided a purnp assembly comprising a substantially cyJ.indrical container for storlng a llquid therein, the con-tainer having open opposlte ends, a pump mounted on one end of the contalner and having a suction port for drawing the liquid ~rom the container and an outlet port for discharging the liquid, a gasket slidably inserted in;the opposite end of the container in contact with the liquid stored in the container, for sealing the liquid ln -the container, the gas-~et being slidable toward the pump when the liquid s-tored in the container is gradually discharged out by the pump, and an inner plug fitted in the one end of the container, the inner plug havlng a slanted portion dispcsed in an end thereo~ which faces in-to the container and having a substan-I:lally conical slanted surface extending contlnuously ~rom an inner peripheral surEace oE the contalner and converginy away Erorn the gaske-t, and a projecti~n pro~ecting outwardly frorn-the container substantially at a converglng end of the .! . . . . .. . . . .
slanted surface, the projection having a through hole coimnu-nicating with the interior space of the container, the suc-tion port being Eitted over -the projec-tion and cornmunicating with the interior space of the con-tainer.
IE air enters the container when the liquid is filled and sealed in the container, then the air is trapped betwe0n the slanted sur~ace and the llquid in the container and collected along the slanted surface into a region near the converying end o~ the slanted surface when the con-tainer is turned upside down so that the purnp is directed upwardly after the liquid is sealed in the con-tainer. At thls time, the tip end of the suction port faces the liquid in the con-tainer across the air substantially at the converging end of the slanted surface. When the pump is actuated, the air is drawn along the slanted surface into the~suction port and then discharged from the outlet port. Thereafter, the liq-uid stored in the container is drawn into the suctlon port and discharged from the outlet port. As the liquid is grad-ually discharged out of the container, the gasket is caused to slide toward the pump while in con-tac-t with the s-tored liquid, which is therefore kept in isolation frorn ambien-t air.
There~ore, any air whlch ls trapped ln th0 con-talner can easily be removed froln the container when the pump ls operated aEter -the llquid is sealed in -the container. Accordin~ly, the liquid sealed in the container can be s-tored in the container withou-t being contacted by air.
If the slanted por;tion is provided by the inner plug to be inserted in the end of the con-tainer on which the pump ls mounted, then the pump assembly of the lnvention can be used with any of various containers when the inner plug is fitted in the end of the container used. ~herefore, any -trapped alr can be removed by the pump from any of th~se various containers.
I the suc-tion port of the pump is fitted over the pro~ectlon pro~ecting outwardly from the container substan-tially ak the converging end of the slanted surface and ls held in communlcation with the interior space of the con-tainer through the through hole defined in the pro~ection, then since the tip end of the suction port is isolated from the interior space of the container by the slanted portion, the tip end of the suction port is prevented from contacting the llquid in the container before the trapped air is com-pletely drained from the container. Conse~uently, the air trapped in the container can fully be removed.
The slanted surface which is substantially conical in shape may easily be formed in-tegrally wi-th the container or the inner plug.
The above and other objec-ts, features and advan tages of the presen-t invention will become more apparent from the foL:Lowing descriptlon when taken in con~unctlon .
wi-th the accompanying drawings in which preferred embodi-ments of the present invention are shown by way of illustra-tive example.
BRIEE' DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross-sectional view of a pump assembly according to an embodiment oE the present inventlon;
FIG. 2 is a fragmentary, partly exploded cross-sectional view showing the manner in which a liquid is Eilled and sealed in the con-tainer of -the pump assembly shown ln FIG. l;
FIG. 3 is a longitudinal cross-sectiorlal vlew o~ a pump assembly according to another embodiment of the present 1nvention;
FIG. 4 1s a fragmentary, partly exploded cross-sectional yiew showing the manner in which a liquid is filled and sealed in the container of the pump assembly shown in FIG. 3; and FIG. 5 is a longitudinal cross-sectional view of a conventional pump assembly.
DETAIEED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As shown in FIG. 1, a pump assembly according -to an ernbodiment oE the present invention comprises a substarl-ti.ally cylindrical contalner 1 w:lth open opposite ends, a pWllp 2 mounted on one end (hereirlaEter re~erred to as an "upper end") of -the container 1 through an adapter 3, for - B -%~3~2~
drawing and ejecting a liquid X which is Ellled in the con-tainer 1, a gaske-t 4 slidably inserted ln the other end (hereinafter referred to as a ~'bottom end") of the contalner 1 whlch is fllled with the liquid X, and a bottom lid 5 fit-ted in the bottom end of the container 1 in which the gasket 4 is inser-ted. The bottom lid 5 has a ven-t hole 6 through which a space between the bot-tom lid 5 and the gasket 4 com-munlcates wlth the ex-terior space of the container 1.
The container 1 has a substan-tially conical slanted portion 7 on l-ts upper end, the slanted portion 7 being concen-tric with a barrel portion of the container 1. The slanted portion 7 has an inner slanted surface B which extends continuously from the inner peripheral surface oE
the barrel portion of the container 1 and converges upwardly into a pro;ection 9 projecting upwardly from the center of the upper surface of the slanted portion 7. The projection g has a vertical through hole 10 communicating with the interior space oE the container lo The adapter 3 is in the form of a hollow cylinder comprising a larger-diameter portion 11 which is of substan-tially the same diameter as the container 1 and a smaller-diameter portion 12 joined concentrically to the larger-diarneter porkion 11 and having a diameter smaller than the diame-ter oE the larger-diameter portlon 1].. The larger~d:Lameter porkion 11 is threaded over an externally threaded annular wall 13 disposed on and ex~-tending around 2~
the slante~ portion 7. ~he projection ~ is concen-trically positioned in the larger-diameter portion 11. The pump 2 has a cylindrical case 14 concentrically threaded over the smaller-diarneter portion 12 of the adapter 3. In th~s manner,. the pump 2 is mounted on the upper end of the con-tainer 1.
The pump 2 is of a construction which is basically the sarne aæ the pump disclosed in Japanese Laid-Open Patent Publi.cation Mo. 61(1986)-263668. The pump 2 has a verti-cally movable presser 5 pro~ecting upwardly from the upper end of the case 1~, a suction port 17 integral with the lower distal end o~ a cylinder 16 which is fixed to the case ~ and extends concentrically downwardly from within the case 14, and an outlet port 18 extending laterally from the upper end of the presser 15. The suction port 17 is inserted in the through hole 10 in the pro~ection 9 such that the lower tip end of the suction port 17 lies flush with the converging end of the slanted surface 8 of the slanted portlon 7. The presser 15 is normally urged to move upwardly by a spring 19 disposed in the cylinder 16. The cylinder 16 defines therein a pump chamber 20 which can be pressurized when the presser 15 is depressed. The interior space of the outlet port 18 comm~ln-lcates with the pump cham~
ber 20 through a valve 21 which is opened when the presser 15 is depressed. The interior space of the suction port 17 communicates with the pump chamber 20 throuyh a valve 22 ~L2~6~3 which ls opened in response to a reduction in the pressure in the pump chamber 20 when the presser 15 returns to its original position under the bias of the spring 19.
When the presser 15 of the pump 2 is depressed by a finger and then released so as to return to its original position, the liquid X filled in the container 1 is drawn through the suction port 17 and the valve 22 into the pump chamber 20. When the presser 15 is depressed again, the liquid X which has been drawn into the purnp chamber 20 is e~ected out of the ou-tlet port 18 through the valve 21.
A process of filling and sealing the liquid X ln the container 1 wlll now be described with reference to FIGS. 1 and 2.
To flll and seal the liquid X in the container 1, the pump 2 ls mounted on the upper end of the container 1, and, thereafter the container 1 is turned upside down to direct the upper end thereof downwardly, as shown in FIG. 2.
Then, the liquid X is filled in the container 1 through the bottom end thereo~ which is now positioned upwardly.
Then, the gasket 4 is inserted into the container 1 through its bottom end until the gasket ~ is brought into contack with the surface of the liquid X. The liquid X-is now sealed in the container 1.
Subsequently, the bottom lid 5 is fit-ted into the bottom end of the container 1, thereby closing the bottom end. The con-tainer 1 is reversed again to direct its upper end upwardly, as shown in FIG. 1.
.
While -the liquid x is being filled and sealed in the container 1 as described above, air Y may be trapped in the container 1. When the upper end o~ the container 1 is direc-ted upwardly as shown in FIG. 1, the air Y which is trapped in the container 1 rises in the liquid X and is col-lected alony the slanted sur~ace 8 -toward the converging end thereof, i.e., irmnediately below the tlp end of the suction port 17 o~ the purnp 2. Therefore, the tlp end of the suc-tion port 17 does not directly contac-t the liquid X, but ~aces the liquid X through the trapped air Y.
Then, the presser 15 ls depressed and released so as to return to its original position. At this time, the air Y ls drawn along the slanted sur~ace 8 through the suc-tion port 17 into the pump chamber 20. When the presser 15 is depressed ayain, the trapped air ~ is dlscharged ~rom the pump chamber 20 through -the outlet port 18. This process is repeated to discharge the air Y gradually from within the slanted portion 7. The gasket 4, while being held in con-tact with the liquid X, is caused to slide in the container 1, ~orcing the liquid X toward the suction por-t 17. ~t the same time that the air Y is entirely removed ~rom within the slanted por-tion 7, the tip end o~ the suctlon port 17 con-tacts the llquid X in the con-talnér 1. ThereaE-ter, the liq-uld X is drawn from the suctlon port 17 and e~ected frorn the ou-tlet por-t 18. ~t this tlrne, the liquid X in -the container 1 :Ls sealed in the con-tainer 1 whlle beincJ isolated from, i.e., out oE contact wlth, -the ambient alr.
With the pump assembly of the present invention, after the liquid X is filled and sealed in the container 1, the pump 2 is operated to discharge the air Y which may be trapped in the container 1 when the liquid X is filled in the container 1. Therefore, the liquid X ls stored in the container 1 in isolatlon from the ambient alr, and can be discharged from the container 1 when necessary.
A pwnp assembly according to another embodiment of the present lnventiorl is shown in FIGS. 3 and 4.
As shown in FIG. 3, the pump assembly comprises a substantially cylindrical container 23 with open opposite ends, a pump 24 mounted on one end (hereinafter referred to as an "upper end") of the container 23 through a~ adapter Z5, a gasket 26 slidably inserted in the other end (hereinafter referred to as a "bottom end"~ of the contalner 23 which is filled with the liqu~d x, and a bottom lid 27 fitted in the bottom end of the container 1 ~n which the gasket 26 is inserted. The bottom lld 27 has a vent hole 28, as wlth the bottom lid 5 shown in FIG. 1.
The pump 24 is of the same structure as the pump 2, and has the presser 15, the suction port 17, and -the outlet port 18.
The upper end of the container 1 opens outwardly through a neck 29 whose diameter is slightly smaller than the diameter of the barrel portion o~ the container 1.
hollow inner plug 30 having an open upper end is inserted in ~ 13 ~
~ 2 -the neck 29. The inner plug 30 has a lateral Elange 30a on its upper end, which engages the upper end of the neck 29.
The inner plug 30 has a substantially conical slanted portion 31 on its lower end, the slanted portion 31 belng of the same configuration as the slanted portion 7 shown ln FIG. 1. With the inner plug 30 fitted ln the neck 29, the slanted portion 31 has an inner slanted surface 32 which extends continuously from the inner peripheral surface of khe barrel portion of the con-tainer 23 and the neck 29 and converges upwardly in-to a pro~ectlon 33 pro~ecting upwardly from the center o~ khe slanted por-tion 3i. The suctlon port 17 o~ the pump 24 is fitted over the pro~ection 33. The pro~ection 33 has a vertical through hole 34 commu-nicaking with the interior space of the container 23.
The adapter 25 is of the same profile as the adapter 3 shown in FIG. 1. The adapter 25 has a larger-diameter portion 35 whose lower portion is threaded over the neck 29 of the container 23, with the neck 29 and the inner plug 30 being concentrically disposed in the larger-diameter portion 35. The adapter 25 also has a smaller-diameter por-tion 36 concentrically threaded in the case 14 of the pump 24. In this manner, the pump 24 is mounted on the upper end of the container 23. The suction port 17 of the pwnp 24 is fi-tted over the pro~ection 33 such that the lower tlp end oE
the suction port 17 abu-ts against the upper surEace of the slanted portlon 31 subs-tantially near the converging end o~
the slanted surface 3 2.
'~
An annular member 37 is fixed to the upper inner peripheral surface of the larger-diameter portion 35 of the adapter 25. When the larger-diameter portion 35 is threaded over the neck 29, the annular member 37 and the neck 29 clamp the flange 30a therebetween, thereby securely holdlng the inner plug 30 in position.
To ~ill and seal the liquld X in the container 23, the inner plug 30 is fitted in -the neck 29. Then, the liq-uid X may be ~illed ln the container 23 -throuyh the bottom end thereo~ and khen sealed therein in the same manner as described with respect to the container 1 shown in FIG. 1.
Alternatively, as shown in FIG. 4, the gasket 26 is inserted in the bottom end of the container 23, and the bo-t-tom end thereof is closed by the bottom lid 27. Thereafter, t-he liquid X is filled in the container 27 through the neck 29 on the upper end thereof, after which the pump 24 is mounted on the upper end of the container 23 through the adapter 25, thus sealing the liquid x in the container 23.
If air Y is trapped in the container 23 when the liquid X is filled and sealed in the container 23, then the air Y is connected along the slanted surface 32 -toward a region directly below the suction port 17 oE the pump 2~.
The pump 24 is then actuated to draw the trapped air Y from the suction port 17 and dlscharge the air Y from the outlet : port 1~. The -trapped a:L.r Y can -there~ore be removed from the container 23.
2~
Slnce the tip end of the suction port 17 is iso-lated from the interior space of the container 23 by the slanted portion 31, the tip end of the suction port 17 is prevented from contacting the liquid x in the container 23, failing to remove any remaining trapped air Y, before the air Y is completsly dralned from the container 23.
Consequently, the air ~ trapped ln the container 23 can fully be removed.
The slanted portion 31 for collecting any trapped air Y lnto the region directly benea-th the suction port 17 : is provided by the lnner plug 30 which is fitted in the con-tainer 23. Therefore, the pump assembly shown in FIGS. 3 and 4 may bs lncorporated ln a contalner whlch has no slanted portlon on its upper end, as with the container 23, for the removal of trapped air.
: Although certain preferred embodiments have been shown and described, it should be understood that many changes and modifications may be made therein without departing from the scope of the appended claims.
.
I
Claims (12)
1. A pump assembly comprising:
a substantially cylindrical container stor-ing a liquid therein, said container having open opposite ends;
a pump mounted on one end of said container and having a suction port for drawing the liquid from said container and an outlet port for discharging the liquid;
a gasket slidably inserted in the opposite end of said container in contact with the liquid stored in the container, for sealing the liquid in said con-tainer, said gasket being slidable toward said pump when the liquid stored in said container is gradually discharged out by said pump; and a slanted portion disposed in and integral with said one end of the container and having a sub-stantially conical slanted surface extending continuously from an inner peripheral surface of said container and converging away from said gasket, said slanted portion having a projection projecting out-wardly from said container substantially at the converging end of said slanted surface, said projection having a through hole communicating with the interior space of said container, said suction port being fitted in said through hole such that a tip end of said suc-tion port lies substantially flush with said converging end of said slanted surface.
a substantially cylindrical container stor-ing a liquid therein, said container having open opposite ends;
a pump mounted on one end of said container and having a suction port for drawing the liquid from said container and an outlet port for discharging the liquid;
a gasket slidably inserted in the opposite end of said container in contact with the liquid stored in the container, for sealing the liquid in said con-tainer, said gasket being slidable toward said pump when the liquid stored in said container is gradually discharged out by said pump; and a slanted portion disposed in and integral with said one end of the container and having a sub-stantially conical slanted surface extending continuously from an inner peripheral surface of said container and converging away from said gasket, said slanted portion having a projection projecting out-wardly from said container substantially at the converging end of said slanted surface, said projection having a through hole communicating with the interior space of said container, said suction port being fitted in said through hole such that a tip end of said suc-tion port lies substantially flush with said converging end of said slanted surface.
2. The pump assembly according to claim 1, wherein the suction port is generally rigid and non-flexible such that the port is readily insertable into the projection when the suction port is fitted in said through hole.
3. The pump assembly according to claim 2, wherein said gasket has a slanted surface which con-forms to the slanted surface of the slanted portion of the container, the slanted surface of the gasket being in mating engagement with the slanted surface of the container when the liquid is fully discharged from the container.
4. A pump assembly comprising:
a substantially cylindrical container stor-ing a liquid therein, said container having open opposite ends;
a pump mounted on one end of said container and having a suction port for drawing the liquid from said container and an outlet port for discharging the liquid;
a gasket slidably inserted in the opposite end of said container in contact with the liquid stored in the container, for sealing the liquid in said con-tainer, said gasket being slidable toward said pump when the liquid stored in said container is gradually discharged out by said pump; and an inner plug fitted in said one end of the container, said inner plug having a slanted portion disposed in an end thereof which faces into said con-tainer, said slanted portion having a substantially conical slanted surface extending continuously from an inner peripheral surface of said container and converg-ing away from said gasket, and a projection projecting outwardly from said container substantially at the con-verging end of said slanted surface, said projection having a through hole communicating with the interior space of said container, said suction port being fitted over said projection and communicating with the interior space of said container.
a substantially cylindrical container stor-ing a liquid therein, said container having open opposite ends;
a pump mounted on one end of said container and having a suction port for drawing the liquid from said container and an outlet port for discharging the liquid;
a gasket slidably inserted in the opposite end of said container in contact with the liquid stored in the container, for sealing the liquid in said con-tainer, said gasket being slidable toward said pump when the liquid stored in said container is gradually discharged out by said pump; and an inner plug fitted in said one end of the container, said inner plug having a slanted portion disposed in an end thereof which faces into said con-tainer, said slanted portion having a substantially conical slanted surface extending continuously from an inner peripheral surface of said container and converg-ing away from said gasket, and a projection projecting outwardly from said container substantially at the con-verging end of said slanted surface, said projection having a through hole communicating with the interior space of said container, said suction port being fitted over said projection and communicating with the interior space of said container.
5. The pump assembly according to claim 4, wherein said suction port is generally rigid and non-flexible such that the port is readily insertable over said projection when the suction port is fitted over said projection.
6. The pump assembly according to claim 5, wherein said gasket has a slanted surface which con-forms to the slanted surface of the slanted portion of the inner plug, the slanted surface of the gasket being in mating engagement with the slanted surface of the inner plug when the liquid is fully discharged from the container.
7. A pump assembly comprising:
a substantially cylindrical container stor-ing a liquid therein, said container having open opposite ends;
a pump mounted on one end of said container and having an elongated suction port for drawing the liquid from said container and an outlet port for discharging the liquid;
a gasket slidably inserted in the opposite end of said container in contact with the liquid stored in the container, for sealing the liquid in said con-tainer, said gasket being slidable toward said pump when the liquid stored in said container is reduced by said pump; and a slanted portion disposed in said one end of the container and having a slanted surface extending continuously from an inner peripheral surface of said container and converging away from said gasket, said slanted portion having a projection projecting out-wardly from said container substantially at said converging end, said projection having a through hole, said suction port of said pump being fitted with said projection and communicating with the interior space of said container substantially at the converging end of said slanted surface.
a substantially cylindrical container stor-ing a liquid therein, said container having open opposite ends;
a pump mounted on one end of said container and having an elongated suction port for drawing the liquid from said container and an outlet port for discharging the liquid;
a gasket slidably inserted in the opposite end of said container in contact with the liquid stored in the container, for sealing the liquid in said con-tainer, said gasket being slidable toward said pump when the liquid stored in said container is reduced by said pump; and a slanted portion disposed in said one end of the container and having a slanted surface extending continuously from an inner peripheral surface of said container and converging away from said gasket, said slanted portion having a projection projecting out-wardly from said container substantially at said converging end, said projection having a through hole, said suction port of said pump being fitted with said projection and communicating with the interior space of said container substantially at the converging end of said slanted surface.
8. The pump assembly according to claim 7, fur-ther comprising an inner plug inserted in said one end of the container, said slanted portion being disposed on an end of said inner plug which faces into said container.
9. The pump assembly according to claim 7, wherein said suction port is fitted over said projec-tion, said suction port communicating with the interior space of said container through said through hole.
10. The pump assembly according to claim 7, wherein said slanted surface is substantially conically shaped.
11. The pump assembly according to claim 7, wherein the elongated suction port is generally rigid and non-flexible such that the port is readily insert-able into the projection portion during manufacture of the pump assembly.
12. The pump assembly according to claim 11, wherein said gasket has a slanted surface which con-forms to the slanted surface of the slanted portion of the container, the slanted surface of the gasket being in mating engagement with the slanted surface of the container when the liquid is fully discharged from the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2012468 CA2012468C (en) | 1990-03-19 | 1990-03-19 | Pump assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2012468 CA2012468C (en) | 1990-03-19 | 1990-03-19 | Pump assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2012468A1 CA2012468A1 (en) | 1991-09-19 |
| CA2012468C true CA2012468C (en) | 1999-01-05 |
Family
ID=4144545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2012468 Expired - Lifetime CA2012468C (en) | 1990-03-19 | 1990-03-19 | Pump assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2012468C (en) |
-
1990
- 1990-03-19 CA CA 2012468 patent/CA2012468C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2012468A1 (en) | 1991-09-19 |
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