JP3687816B2 - Liquid jet pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid jet pump.
[0002]
[Prior art]
In the liquid ejection pump, a mounting cylinder for attaching to the mouth and neck of the container body is provided on the outer periphery of the upper end of the cylinder, and a holding ring for closing the cylinder is provided at the upper end of the cylinder, and the stem is moved up and down in the holding ring. The stem is provided with an annular piston at the lower end and fitted into the cylinder so as to be slidable in the vertical direction, and a press-down nozzle head is fitted and connected to the outer periphery of the upper end portion. The lower end of the cylinder is formed so as to be screwed and supported, a suction valve is provided in the lower end portion of the cylinder, a discharge valve is provided in the upper end portion of the stem, and between the holding ring and the stem. And a small air hole is formed in the upper part of the cylinder, an outside air introduction path is formed by the clearance or the air hole, and a spring is housed in the cylinder. It is one obtained by biasing the arm upward, to obtain a fresh air introduction into the pump operating and the container body by raising and lowering the pressing nozzle head is known.
This liquid jet pump usually has a suction pipe suspended from the lower end of the cylinder, is attached to the mouth and neck of a container body containing liquid by a mounting cylinder, and the push-down nozzle head is at the lower limit. It is distributed in the market in a state of being screwed and supported by the retaining ring.
Generally, in this state, structural considerations are taken to close the internal flow path and the outside air introduction path of the stem so that liquid leakage does not occur. Therefore, even if it is tilted, falls, or inverted during transportation, etc. Although there will be no leakage, liquid in the container will flow into the cylinder from the air hole in the outside air introduction path when it is tilted, overturned, or inverted, and this raises the push-down nozzle head by screwing it from the holding ring. When it is made to leak, it may leak to the exterior from the clearance gap of a holding ring with a raise of an annular piston.
[0003]
[Problems to be solved by the invention]
In order to solve this problem, the present applicant has previously developed the one disclosed in Japanese Utility Model Publication No. 3-23316.
Japanese Utility Model Publication No. 3-23316 has a seal ring that closes the air hole at the inner periphery of the upper end of the cylinder in the above-described liquid jet pump, and the push-down nozzle head is screwed off from the holding ring to raise it. In some cases, the air holes are pushed upward to open the air holes.
However, in this case, the once-lifted seal ring is locked so as not to be lowered, and it is difficult to screw the pressed-down nozzle head into the holding ring again. In addition, since the lower and upper steps were formed on the upper and lower parts of the outer periphery of the stem to push down and push up the seal ring at the beginning, the stem and the annular piston were separated from each other due to the synthetic resin molding. Thus, the number of members increases, the number of assembly steps increases, and the cost increases.
The present invention is intended to solve these problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the mounting cylinder 2 is provided on the outer periphery of the upper end of the cylinder 1, the holding ring 3 is provided on the upper end of the cylinder 1, and the stem 4 is moved up and down in the holding ring. The stem is provided with an annular piston 5 at the lower end and fitted into the cylinder 1 so as to be slidable in the vertical direction, and a push-down nozzle head 6 is fitted and connected to the outer periphery of the upper end. The nozzle head is formed so as to be screwed and supported to the holding ring 3 at the lower limit thereof, the suction valve 7 is provided in the lower end portion of the cylinder 1, and the discharge valve 8 is provided in the upper end portion of the stem 4. A gap 9 is provided between the holding ring 3 and the stem 4, and a small air hole 10 is formed in the upper part of the cylinder 1, and an outside air introduction path 11 is formed by the gap 9 to the air hole 10. In the cylinder 1 12 is installed, the stem 4 is urged upward, and the push-down nozzle head 6 is screwed to and supported by the holding ring 3 at the lower limit, thereby closing the liquid flow path inside the liquid flow path blockage. In the liquid jet pump that takes the means 13 and moves the push-down nozzle head 6 up and down to obtain pump operation and introduction of outside air into the container body, the air hole 10 is opened and closed at the inner periphery of the upper end of the cylinder 1 by raising and lowering. The movable seal ring 14 is fitted so that the movable seal ring 14 can be opened / closed / moved upward / downward at the air hole 10 or more, and the position can be maintained, and the stem 4 can be moved up and down inside the movable seal ring 14 and the air passage 15 is held. An upward step 16 is formed on the outer periphery of the lower end of the stem 4 so as to push up the movable seal ring 14 and shut off the air passage 15. The above movable Lower thrust Le ring 14 and by forming a downwardly stepped portion 18 for blocking the air passage 15.
[0005]
The invention according to claim 2 is the liquid ejection pump according to claim 1, wherein as the screwing means between the push-down nozzle head 6 and the holding ring 3, an external threaded screw cylinder 19 is raised on the holding ring 3, An inner threaded screw cylinder 20 that is threadedly engaged with the outer threaded threaded cylinder 19 is provided vertically from the pressed nozzle head 6 outside the stem fitting portion 17.
[0006]
The invention according to claim 3 is the liquid jet pump according to claim 1 or 2, wherein a discharge valve is formed as a ball valve 21 as the discharge valve 8, and the valve chamber 22 is extended in the vertical direction. The ball valve 21 is formed by increasing the vertical movement distance.
According to a fourth aspect of the present invention, there is provided the liquid jet pump according to the first, second, or third aspect , wherein the cylinder 1 is air-operated so that the movable seal ring 14 can maintain a position above the air hole 10. The inner diameter is increased above the hole 10 , and a large-diameter outward skirt 23 is provided in the upper part of the movable seal ring 14 and a small-diameter outward skirt 24 is provided in the lower part corresponding to the large and small inner diameters .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The drawings show an embodiment of the liquid ejection pump of the present invention.
In the figure, 1 is a vertical cylinder, 2 is a mounting cylinder provided on the outer periphery of the upper end of the cylinder, 3 is a holding ring provided on the upper end of the cylinder 1, and 4 is movable up and down within the holding ring. 5 is an annular piston provided at the lower end of the stem and fitted in the cylinder 1 so as to be slidable in the vertical direction, and 6 is a cylindrical nozzle fitting portion provided vertically from the center of the lower surface. A press-down nozzle head in which 17 is fitted and connected to the outer periphery of the upper end of the stem 4, 7 is a suction valve provided in the lower end of the cylinder 1, 8 is a discharge valve provided in the upper end of the stem 4, 9 Is a gap provided between the holding ring 3 and the stem 4, 10 is a small air hole formed in the upper part of the cylinder 1, 11 is an outside air introduction path formed by the gap 9 to the air hole 10, 12 Is a spring built in the cylinder 1 to urge the stem 4 upward, and 13 is a push-down A liquid flow passage closing means 28 for closing the liquid flow passage by screwing and supporting the slur head 6 to the holding ring 3 at its lower limit, 28 is a suction pipe suspended from the lower end of the cylinder 1. The member is formed of a synthetic resin except for the spring. Needless to say, the spring may be formed of synthetic resin.
[0008]
The cylinder 1 is fitted with a movable seal ring 14 that opens and closes the air hole 10 by raising and lowering on the inner periphery of the upper end portion so that the air hole 10 can be opened and closed and moved up and down by the air hole 10 and can be held by friction. For fitting that can hold the position, the inner diameter is slightly increased slightly above the air hole 10 in the cylinder 1, and a large-diameter outward skirt 23 is formed on the movable seal ring 14 so as to correspond to the large and small inner diameter. In addition, a small-diameter outward skirt 24 is provided at the lower portion, and these outward skirts are relatively tightly fitted with a relatively strong pressure contact force.
The movable seal ring 14 is inserted into the movable seal ring 14 while allowing the stem 4 to move up and down and to have a ventilation passage 15 by a gap. An upward stepped portion 16 that blocks the passage 15 is formed, and a downward stepped portion 18 that pushes down the movable seal ring 14 and blocks the vent passage 15 is formed at the lower end of the stem fitting portion 17 of the pressing nozzle head 6. doing.
[0009]
An external screw cylinder 19 is erected from the upper surface of the holding ring 3, and an internal screw cylinder that engages with the external screw cylinder 19 outside the stem fitting portion 17 of the push-down nozzle head 6. 20 is vertically provided, and the inner screw screw tube is screwed to the outer screw screw tube 19 so that the pressing nozzle head 6 is supported by the holding ring 3 at the lower limit.
The suction valve 7 is formed by a taper valve body 29 and is brought into pressure contact with the valve seat at the lower end of a thin valve spring 26 whose upper end is supported by a standing member 25 raised at the lower part in the cylinder 1.
The discharge valve 8 is a ball valve 21, and its valve chamber 22 is extended in the vertical direction to increase the vertical movement distance of the ball valve 21.
The liquid flow path closing means 13 for closing the internal liquid flow path is provided at the lower part in the cylinder 1 so as to close the lower end of the stem 4 by screwing and supporting the push-down nozzle head 6 to the holding ring 3 at its lower limit. A plug portion 27 is provided at the upper end of the upright member 25 that is erected.
[0010]
With the above-described configuration, the mounting cylinder 2 is attached to the mouth and neck portion of the container body containing the liquid, and as shown in FIG. 1, the pressing nozzle head 6 is lowered to the lower limit, and the pressing nozzle head The inner threaded screw cylinder 20 is screwed into the outer threaded threaded cylinder 19 of the retaining ring 3 and distributed as a product in the market. In this state, as shown in FIG. The stem fitting cylinder 17 is pushed down at the lower step 18 at the lower end to close the air hole 10 of the cylinder 1, and the lower step 18 blocks the air passage 15 in the movable seal ring 14, so that the outside air introduction passage 11 is blocked in two stages. Therefore, the liquid in the container body does not flow into the cylinder 1 from the air hole 10 and, of course, does not leak to the outside through the outside air introduction path 11.
At this time, the plug portion 27 at the upper end of the standing member 25 raised at the lower part in the cylinder 1 closes the lower end of the stem 4 and the liquid flow passage closing means 13 is closed. There is no possibility that the nozzle nozzle 6 flows out to the outside.
[0011]
Next, when the push-down nozzle head 6 is unscrewed and the stem 4 and the annular piston 5 are raised together by the elasticity of the spring 12, the movable seal ring 14 is moved to the outer periphery of the lower end of the stem 4 as shown in FIG. The air hole 10 of the cylinder 1 is opened by being pushed up by the upward step portion 16, but at this time, it is blocked by the ventilation passage 15 of the movable seal ring 14 or the upward step portion 16 thereof, and the outside air introduction passage 11 is It is still blocked. Therefore, even if a fall or the like occurs at this time, the liquid in the container body does not flow out to the outside through the outside air introduction path 11. Then, the plug portion 27 fitted to the lower end of the stem 4 is removed, and the liquid flow path closing means 13 is opened, and the pump is activated as a whole.
In this state, the push-down nozzle head 6 is pushed down against the spring 12 and returned and raised by the elasticity of the spring, whereby the suction valve 7 and the discharge valve 8 work, and the pressurizing chamber in the cylinder 1 is pressurized. A negative pressure is applied, and the liquid in the container is sucked up and pressurized, and is ejected from the nozzle of the pressed-down nozzle head 6.
By the way, when the pressure in the pressurizing chamber becomes negative, the ball valve 21 of the discharge valve 8 is closed. At this time, the ball valve 21 causes a time delay in closing due to a long descending distance. The liquid in the pushed-down nozzle head 6 is pulled back to the cylinder 1 by the delay and the negative pressure in the cylinder 1 at that time. At the same time, the liquid in the pressed-down nozzle head 6 is mechanically pulled back by the ball valve 21 being lowered by a long distance. Therefore, no liquid remains in the pressed-down nozzle head 6, and the residual liquid does not leak to the outside.
Further, the external threaded screw cylinder 19 of the retaining ring 3 and the inner threaded screw cylinder 20 of the depressed nozzle head 6 provided as screwing means between the depressed nozzle head 6 and the retaining ring 3 are fitted into the stem of the depressed nozzle head 6. Since the joint portion 17 is separated, the gap 9 as the outside air introduction path 11 between the inner side of the external threaded screw cylinder 19 and the stem 4 can be narrowed. Hot water entering from the gap 9 is greatly reduced.
[0012]
Thereafter, the push-down nozzle head 6 can be lowered to the lower limit, and the inner screw screw cylinder 20 of the push-down nozzle head can be screwed into the outer screw screw cylinder 19 of the holding ring 3 again. In this case, the state shown in FIG. 1 is obtained as in the case where the product is distributed in the market.
[0013]
【The invention's effect】
According to the inventions of claim 1, claim 2, claim 3 and claim 4 , according to the structure described above, not only when the product is distributed to the market but also after the consumer starts using it, it is pushed down. By lowering the nozzle head 6 to the lower limit and screwing it onto the holding ring 3, the movable seal ring 14 can be pushed down by the downward step 18 at the lower end of the stem fitting cylinder 17, and the air hole of the cylinder 1 10 can be closed, and liquid leakage from the outside air introduction path 11 can be prevented. Further, since the movable seal ring 14 is pushed down by the downward step portion 18 at the lower end of the stem fitting cylinder 17, the stem 4 and the annular piston 5 can be integrally formed of synthetic resin without any trouble. The number of members can be reduced, the assembly can be simplified, and the cost can be reduced.
[0014]
In addition, according to the second aspect of the present invention, as the screwing means between the pressing nozzle head 6 and the holding ring 3, the external screw cylinder 19 is erected from the holding ring 3, and the stem fitting is performed from the pressing nozzle head 6. Since the inner threaded screw cylinder 20 that engages with the outer threaded threaded cylinder 19 is suspended from the outside of the part 17, the stem fitting part 17 of the push-down nozzle head 6 can be separated from the threading means, The gap 9 that is the outside air introduction path 11 between the inside of the external threaded screw cylinder 19 and the stem 4 can be narrowed without hindrance, and hot water entering from the gap 9 in the bathroom or shower room can be reduced as much as possible. .
[0015]
Further, according to the invention of claim 3, a discharge valve by the ball valve 21 is formed as the discharge valve 8, and the valve chamber 22 is extended in the vertical direction to increase the vertical movement distance of the ball valve 21. Therefore, the valve closing can be delayed in time, and the liquid in the pushed-down nozzle head 6 can be pulled back to the cylinder 1 by the time delay of the valve closing and the negative pressure in the cylinder 1 at that time. In addition, the liquid in the pressed-down nozzle head 6 can be mechanically pulled back by the lowering of the ball valve 21, so that the liquid in the pressed-down nozzle head 6 can be prevented from remaining, and the remaining liquid leaks to the outside. It can be prevented from exiting.
Furthermore, according to the invention of claim 4, the movable seal ring 14 can be held at a position above the air hole 10 .
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a pump non-operation state showing an embodiment according to the inventions of claims 1 to 3;
FIG. 2 is a longitudinal side view of a pump operating posture in the same embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylinder 2 ... Mounting cylinder 3 ... Holding ring 4 ... Stem 5 ... Ring piston 6 ... Push-down nozzle head 7 ... Suction valve 8 ... Discharge valve 9 ... Gap 10 ... Air hole
11 ... Outside air introduction path 12 ... Spring
13 ... Liquid channel closing means 14 ... Movable seal ring
15 ... Airway 16 ... Upward step
17… Stem fitting part 18… Down step
19… Screw outer thread 20… Screw inner thread
21 ... Ball valve 22 ... Valve chamber
23 ... outward skirt 24 ... outward skirt
25 ... Standing member 26 ... Thin valve spring
27 ... Plug part 28 ... Suction pipe
29… Taper disc

Claims (4)

 A mounting cylinder 2 is provided on the outer periphery of the upper end portion of the cylinder 1, and a holding ring 3 is provided on the upper end of the cylinder 1, and a stem 4 is inserted into the holding ring so as to be movable up and down. 5 is fitted in the cylinder 1 so as to be slidable in the vertical direction, and a push-down nozzle head 6 is fitted and connected to the outer periphery of the upper end portion, and the push-down nozzle head is screwed to the holding ring 3 at its lower limit. The suction valve 7 is provided in the lower end portion of the cylinder 1, the discharge valve 8 is provided in the upper end portion of the stem 4, and a gap is provided between the holding ring 3 and the stem 4. 9, a small air hole 10 is formed in the upper part of the cylinder 1, an outside air introduction path 11 is formed by the clearance 9 through the air hole 10, and a spring 12 is housed in the cylinder 1. Energize the stem 4 upward Further, a liquid channel closing means 13 for closing the liquid channel inside is provided by screwing and supporting the pressing nozzle head 6 to the holding ring 3 at the lower limit thereof, and the pressing nozzle head 6 is moved up and down. In the liquid jet pump that obtains the pump operation and introduces the outside air into the container body, the movable seal ring 14 that opens and closes the air hole 10 by moving up and down on the inner periphery of the upper end of the cylinder 1 is opened and closed above and below the air hole 10. The stem 4 is inserted into the movable seal ring 14 so that the stem 4 can move up and down and the air passage 15 is held inside the movable seal ring 14. An upward stepped portion 16 is formed that pushes up the movable seal ring 14 and blocks the air passage 15, pushes down the movable seal ring 14 to the lower end of the stem fitting portion 17 of the push-down nozzle head 6, and the air passage. Block 15 A liquid jet pump characterized in that a downward stepped portion 18 is formed.  As a screwing means for the press-down nozzle head 6 and the holding ring 3, an external screw cylinder 19 is erected on the holding ring 3, and from the press-down nozzle head 6 to the outside of the stem fitting portion 17. 2. The liquid jet pump according to claim 1, wherein an inner threaded screw cylinder 20 that is screwed with the outer threaded thread cylinder 19 is suspended.  The liquid ejection pump according to claim 1 or 2, wherein a discharge valve by a ball valve 21 is formed as the discharge valve 8, and the valve chamber 22 is extended in the vertical direction to increase the vertical movement distance of the ball valve 21. . The above movable seal ring 14 Air hole Ten In order to be able to hold the above position, the cylinder 1 is provided with an air hole. Ten The inner diameter of the movable seal ring is increased to correspond to the larger and smaller inner diameters. 14 Large diameter outward skirt on top of twenty three Also, a small diameter outward skirt at the bottom twenty four The liquid ejection pump according to claim 1, wherein the liquid ejection pump is provided.

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