JP2000142766A - Liquid discharge pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inconvenience that a discharged amount decreases or the like even if a head is rapidly pushed down by providing a liquid discharge pump with a descent limit mechanism for limiting relative descending of a vertically movable member for a large diameter cylinder to a small width. SOLUTION: A descent limit mechanism A comprises an inverted-skirt-like part 42 extending, which passes through a discharge valve hole 22 from a center on an upper face of a base 35 of a vertically movable member 7 to integrally expand above it and which brings an outer peripheral face into contact with and locks an upper end opening rim of the discharge valve hole 22 while a liquid in a large diameter pressurizing chamber can flow out to a discharge port 27 when the member 7 lowers toward a large diameter cylinder 5. The vertically movable member 7 is relatively lowered to the large diameter cylinder 5 to open a discharge valve 38 for discharging the liquid from the discharge port 27. At this time, the member 7 which has lowered brings an outer periphery of the inverted-skirt-like part 42 into contact with and locks the upper end opening rim of the discharge valve hole 22, thereby limiting further relative descent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid ejection pump.

[0002]

2. Description of the Related Art As a liquid ejection pump, for example, a cap which is fitted around the neck of a container body and has a guide cylinder set up, a small-diameter cylinder whose upper end is fixed by the cap and which is vertically suspended in the container body, It is guided up and down on the inner surface of the cylinder,
And, a large diameter cylinder having a discharge valve hole formed in the center of the top plate is fixed to the lower end, and an ejection head having an ejection hole opened on one side communicated with the large diameter cylinder through the discharge valve hole, A large-diameter piston and a small-diameter piston which are fitted in the large-diameter cylinder and the small-diameter cylinder, respectively, protrude from the upper and lower parts of the outer periphery of the rod-shaped base, and communicate with the large-diameter and small-diameter pressurizing chambers defined by the pistons. With a road, and
2. Description of the Related Art There has been known an apparatus provided with a vertically moving member that forms a discharge valve by forming a valve body whose top portion closes a discharge valve hole, and a coil spring that constantly urges the vertically moving member upward. By lowering the head, the internal pressure in the large-diameter pressurized chamber communicating with the small-diameter pressurized chamber via the flow path increases due to the diameter difference between the pistons. The discharge valve is opened downward, and the pressurized liquid is ejected from the ejection port.

[0003]

In a conventional pump of this type, a normal press-down operation can perform a good jet of liquid as described above, but the user presses down the head extremely quickly. In such a case, the pressure in the large-diameter pressurizing chamber becomes too high, and the vertical moving member descends too much with respect to the large-diameter cylinder. In some cases, the small-diameter piston may reach the recess earlier than usual, and the ejection amount may be smaller than usual. The present invention has been made in view of the above points, and even when the head is pressed down earlier than usual, there is no risk of inconvenience such as a decrease in the ejection amount, and the present invention is also compared with conventional products. Therefore, an excellent pump that does not require complicated manufacturing is proposed because only a part of the structural change is required.

[0004]

In order to solve the above-mentioned problems, a pump according to the present invention is fitted to the outer periphery of the neck portion 9 of the container body, and is provided with a cap 3 having an upright guide cylinder 12 and a cap. A small-diameter cylinder 4 having a suction valve 13 provided at the lower end of the inside thereof and a depressed annular recess 16 provided on the inner peripheral surface thereof, and vertically guided by the inner surface of the guide cylinder. And a discharge valve hole in the center of the top plate 21
A large-diameter cylinder 5 having a large-diameter cylinder 22 fixed to the lower end thereof, and an ejection head 6 having an ejection port 27 opened on one side communicating with the large-diameter cylinder via a discharge valve hole; And a large-diameter piston respectively fitted in the small-diameter cylinder 4
33 and a small-diameter piston 34 project from the upper and lower portions of the outer periphery of the rod-shaped base 35, and have a flow path a communicating with the large-diameter and small-diameter pressurizing chambers 36 and 37 defined by the pistons. Is a pump provided with a vertically movable member 7 having a discharge valve 38 formed by a discharge valve hole 22 and a coil spring 32 for constantly urging the vertically movable member 7 upward.
The liquid ejection pump is provided with a descent restricting mechanism A for restricting the descent relative to the large-diameter cylinder 5 to a small width.

Further, in the pump according to the second aspect of the present invention, the lowering mechanism A is provided with a discharge valve hole 22 from the center of the upper surface of the vertically moving member 7.
And spreads upwardly therethrough, and when the vertical moving member 7 descends with respect to the large-diameter cylinder 5, the outer peripheral surface is placed on the discharge valve hole so that the liquid from the discharge valve hole 22 can flow to the ejection port 27. The liquid ejecting pump according to claim 1, which is a descent restricting mechanism in which an inverted skirt-shaped portion 42 that abuts and locks on the peripheral edge portion is extended.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The liquid ejection pump 1 of the present invention
It is used by being attached and fixed to the container body 2, and the cap 3
, A small-diameter cylinder 4, a large-diameter cylinder 5, an ejection head 6, and a vertically moving member 7. Container body 2 to be attached
The one in which the mouth and neck part 9 stands up from the trunk part 8 can be adopted.

The cap 3 fixes the pump 1 to the container and guides the large-diameter cylinder 5 so as to be able to move up and down. The cap 3 has a flange-like top from the upper edge of the peripheral wall 10 fitted around the mouth and neck 9. The wall 11 is extended, and the guide tube 12 is erected above the inner peripheral edge of the upper surface of the top wall 11. The small-diameter cylinder 4 has an upper end fixed by a cap 3 and is vertically suspended in the container body 2, and has a suction valve 13 at an inner lower end. In the illustrated example, a flange 14 extending from the upper end of the outer periphery is fitted to the lower surface of the top wall 11 and the upper portion of the inner surface of the peripheral wall of the cap 3 while preventing the flange 14 from coming off, and the lower surface of the flange 14 is connected via the packing 15 to the container neck and neck. 9 Press-fix to the upper surface. Further, an annular concave portion 16 for pressure reduction is provided at a predetermined position in the center in the vertical direction on the inner peripheral surface of the cylindrical wall, and a small-diameter piston (to be described later) which has been pushed down is fitted to reduce the pressure in the small-diameter cylinder 4 so that a good liquid is obtained. It is configured so that it can be cut. Further, the upper end of the pipe 18 is fitted to the pipe fitting tube 17 vertically provided below the suction valve 13, and the lower end is hung down on the bottom of the container. Further, a pair of through holes 19 and 20 are formed in the upper part of the cylindrical wall at predetermined intervals.

The large-diameter cylinder 5 is fixed to the lower end of the ejection head 6, has a cylindrical shape with a lower end opening guided up and down on the inner peripheral surface of the guide cylinder 12, and has a discharge valve hole 22 in the center of the top plate 21.
It is made by drilling. In the illustrated example, a locking ridge 24 protruding from the outer peripheral lower portion of the peripheral wall 23 is abutted and locked on a lower surface of a locking ridge 25 protruding from the inner peripheral upper end portion of the guide cylinder 12 to prevent upward escape. And the upper end of the top plate 21
There are 26 standing. The ejection head 6 fixes the large-diameter cylinder 5 to the lower end, and connects the inside of the large-diameter cylinder 5 with the ejection port 27 opened to one side through the discharge valve hole 22. In the illustrated example, a vertical cylinder fitted in a liquid-tight manner
At the same time, the peripheral wall 30 is vertically extended from the peripheral edge of the top wall 29, and the base end is connected to the upper end of the front portion of the vertical cylinder 28, and the front end outlet 27 is formed at the front of the peripheral wall 30. An ejection nozzle 31 that opens is provided.

The vertically moving member 7 is constantly urged upward by a coil spring 32, and a large-diameter piston 33 and a small-diameter piston 34, which are fitted in the large-diameter cylinder 5 and the small-diameter cylinder 4, respectively, are mounted on the outer periphery of the rod-shaped base 35. And a flow path a that protrudes from the lower part and communicates with the large-diameter and small-diameter pressurizing chambers 36 and 37 defined by the pistons. Is formed.

In the illustrated example, the vertically moving member 7 is composed of two members, a small-diameter cylinder 4 protrudes from the outer periphery of the lower cylindrical portion, and a discharge valve hole is formed at the tip of the upper cylindrical portion.
22 A base formed with a tapered portion b pressed against the lower opening edge and fitted between the upper outer periphery of the cylindrical portion to the upper outer periphery of the cylindrical portion, and a large-diameter piston
Reference numeral 33 designates a downwardly directed skirt piece 39 which is fitted into the inner surface of the small-diameter cylinder 4 from the outer peripheral lower end portion, and is constituted by an outer skin body projecting therefrom. Further, a vertical groove 40 is provided vertically in the upper outer periphery of the base, and a through-hole 41 communicating with the vertical groove 40 is formed in the upper end of the cylindrical portion of the base to form a small-diameter pressurizing chamber 37. Large-diameter pressurized chamber 36
And a flow path a that communicates with.

According to the present invention, in the above-described liquid ejection pump, a descent restricting mechanism A for restricting a relative descent of the vertically moving member with respect to the large-diameter cylinder to a small width is provided. By providing the lowering limit mechanism A, it is possible to prevent a disadvantage such as a decrease in the amount of liquid ejected from occurring, and to always eject a substantially constant amount of liquid regardless of the pressing force of the head. I have. In addition, the small width referred to here is a width that allows the vertical moving member 7 to move down and discharge the liquid in a normal amount from the discharge valve hole 22. For example, in the case of the embodiment of FIG. A fall width of about 1 mm is conceivable, but is not limited to this.

The lowering mechanism A can take various forms. For example, the lowering mechanism A extends through the discharge valve hole 22 from the center of the upper surface of the base 35 of the vertical moving member 7 and integrally extends thereabove. 7, the liquid in the large-diameter pressurizing chamber 36 can flow out to the ejection port 27 when descending with respect to the large-diameter cylinder 5,
A descent restricting mechanism A can be employed in which an inverted skirt-shaped portion 42 for extending the outer peripheral surface into contact with the upper opening edge of the discharge valve hole 22 is extended.

In the embodiment shown in FIGS. 1 and 2, a large number of concave grooves 43 which are open on the upper surface and the inner surface are formed on the inner peripheral edge of the upper surface of the top plate 21 of the large-diameter cylinder 5. ), The discharge valve is maintained while the tapered portion b of the vertically moving member 7 urged upward is in contact with the lower end opening edge of the discharge valve hole 22 and locked.
38, and the head 6 is pushed down to move the vertical
Is lowered relative to the large-diameter cylinder 5 as shown in FIG.
As shown in (b), the outer periphery of the inverted skirt-shaped portion 42 has a discharge valve hole.
The large-diameter pressurizing chamber 36 is in contact with the upper end opening edge of the head 22 to maintain the flow between the large-diameter pressurizing chamber 36 and the inside of the head 6 while preventing the vertical moving member from descending further with respect to the large-diameter cylinder 5. .
In the figure, reference numeral 50 denotes a rod-shaped body provided at the center in the lower part of the small-diameter cylinder, and a plurality of locking ribs 51 protruding in the circumferential direction are fitted to the lower end of the small-diameter cylinder from the outer periphery of the lower end thereof. A coil spring is interposed between the upper surface of each rib and the lower surface of the vertically moving member.

First, when the head 6 is pushed down from the state shown in FIG. 1, the vertical moving member 7 is pushed down, and the inside of the small-diameter pressurizing chamber 37 is pressurized. At the same time, the inside of the large-diameter pressurizing chamber 36 communicating therewith is also pressurized. At this time, the force applied to the large-diameter piston 33 increases due to the difference in diameter between the large-diameter and small-diameter pistons. Is opened, and the liquid is ejected from the ejection port 27. At this time, the vertically moving member that has fallen, since the outer periphery of the inverted skirt upper portion 42 is abutted and locked to the upper opening edge of the discharge valve hole 22, no further relative lowering occurs, and
The liquid is ejected to the ejection port 27 through each groove 43.

In the embodiment shown in FIG.
Instead, a through-hole 44 is formed in the lower part of the inverted skirt-shaped portion 42. In the embodiment shown in FIG. 4, instead of providing the above-mentioned inverted skirt-shaped portion, the lower portion is fitted into a fitting concave portion 45 formed below the upper surface of the base portion 35, and is erected above the discharge valve hole 22. A descent restricting mechanism A is provided in which a plurality of locking projections 47 in the circumferential direction protrude radially from the upper end of the outer periphery of the fixed rod 46. Each of the above members is mainly formed of a synthetic resin, and may be formed by using an elastomer, a metal, or the like as needed.

[0016]

As described above, the liquid jet pump according to the present invention has the above-described structure, so that the relative lowering of the vertically moving member with respect to the large-diameter piston is limited to a constant value. Regardless, the pressure in the large-diameter pressurizing chamber does not become too high, and the vertical moving member does not drop too much with respect to the large-diameter cylinder. As a result, the small-diameter piston reaches the depressurizing annular recess earlier than usual. However, there is no inconvenience such that the ejection amount is smaller than usual, and almost the same amount of liquid can always be ejected.

Further, in the pump according to the second aspect of the present invention, since the pump can be formed by a simple structural change such as integrally extending an inverted skirt-like portion at the upper end of the conventional vertical moving member, there is no manufacturing complexity. It has the advantage of being easily obtained.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating an operation of the embodiment.

FIG. 3 is an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing still another embodiment of the present invention.

[Explanation of symbols]

2 ... container body, 3 ... cap, 4 ... small diameter cylinder, 5 ... large diameter cylinder, 6 ... ejection head, 7 ... vertical moving member, 9 ... mouth and neck, 12 ... guide cylinder, 16 ... annular concave part, 21 ... large diameter Cylinder top plate, 22… Discharge valve hole, 27… Injection port, 33… Large-diameter piston, 34
… Small diameter piston, 35… Bar base, 36… Large pressure chamber, 37…
Small-diameter pressurizing chamber, 38: discharge valve, 42: inverted skirt, a: flow path, A: descent restricting mechanism

Continued on the front page F term (reference) 3E014 PA01 PB01 PC03 PD12 PE05 PE06 PE11 PE14 PE16 3E084 AA04 AA12 AB01 BA02 CA02 CC03 DA01 DB12 DC03 FA09 FB01 GA04 GB04 HA03 HB09 HC03 HD01 KA01 KB01 LB02 LB07 LC01 LC06 LD22 LD25 LD26 LE20 LE20

Claims (2)

[Claims] 1. A cap 3 on which a guide tube 12 is erected, the upper end of which is fixed by a cap, and which is vertically suspended in the container body. And a large-diameter cylinder 4 having an inner peripheral surface provided with an annular recess 16 for pressure reduction, and a large-diameter cylinder guided up and down on the inner surface of the guide cylinder and having a discharge valve hole 22 formed in the center of a top plate 21. The cylinder 5 is fixed to the lower end, and the ejection port 27 opened on one side communicates with the inside of the large-diameter cylinder through the discharge valve hole, and is fitted in the large-diameter cylinder 5 and the small-diameter cylinder 4 respectively. A large-diameter piston 33 and a small-diameter piston 34 are provided to protrude from upper and lower portions of the outer periphery of the rod-shaped base 35, and a flow path a is provided for communicating the large-diameter and small-diameter pressurizing chambers 36 and 37 defined by the pistons. The discharge valve 38 is formed with the discharge valve hole 22 at the top. A vertical movement member 7 and a coil spring 32 that constantly urges the vertical movement member 7 upward, a descent restricting mechanism that limits the relative descent of the vertical movement member 7 to the large-diameter cylinder 5 to a small width. A liquid ejection pump, wherein A is provided. 2. The descent restricting mechanism A extends through the discharge valve hole 22 from the center of the upper surface of the up-down moving member 7 and extends integrally therewith. A downward restricting mechanism comprising an inverted skirt-shaped portion extending to abut and lock the outer peripheral surface to the upper peripheral edge of the discharge valve hole in a state in which the liquid from the valve hole can flow to the jet port. Item 2. A liquid ejection pump according to Item 1.