JPH0639807Y2 - Liquid ejector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to liquid ejectors.

"Problems to be Solved by Conventional Techniques and Inventions" For example, a liquid ejector disclosed in Japanese Utility Model Laid-Open No. Sho 59-82569 has a structure in which a cylinder is suspended from a mounting cylinder for fitting a neck of a container body and The actuating member standing upright from above is pushed down against the urging force so that the actuating member is detachably fitted to the auxiliary cylinder fitted in the upper part of the cylinder, and the actuating member is moved downward from the stem and the stem. It is composed of a cylindrical piston fitted vertically movable within a certain range and a head with a nozzle fitted to the upper end of the stem, and a discharge valve hole that opens and closes by the vertical movement of the cylindrical piston with respect to the stem is formed in the lower part of the stem. Further, the lower end surface of the stem is brought into contact with the upper surface of a ball valve loosely fitted in the lower part of the cylinder, and the suction valve formed by the ball valve and the valve seat attached to the lower end of the inner surface of the cylinder is kept closed. Is formed.

In the liquid ejector having the above-described configuration, since the tubular piston is pulled up after the actuating member is lifted behind the stem, the discharge valve hole is always closed, as in the case where the ball valve forms the discharge valve. When the container falls, the ball valve rolls in the valve chamber, which has the advantage that the discharge valve does not open and leak liquid.However, when the operating member is pushed down, the cylindrical piston is located above the discharge valve hole. It does not block the discharge valve hole.

Since the liquid ejector is distributed in the market with the actuating member being pushed down in order to make the packaging compact, the discharge valve hole remains open. Therefore, the ball valve is pressed against the suction valve seat at the lower end of the stem to close the suction valve, but the stem length is important for closing the suction valve due to the pressure contact. It will not be possible to press into, and if it is long,
Before fitting the fitting part of the upper part of the stem to the auxiliary cylinder, the lower end of the stem comes into contact with the ball valve and cannot be pushed down.Therefore, the operating member cannot be pushed down, and the allowable range of stem dimensions is small. Therefore, there is a drawback that the cost becomes high.

Further, in the liquid injector, the discharge valve hole formed in the lower part of the stem is closed by the inner wall surface of the cylindrical piston fitted to the outer surface of the lower part of the stem, and the vertical movement of the cylindrical piston closes the discharge valve hole. Since it is provided to open and close, the contact area of the cylindrical piston inner wall surface with the stem becomes large, and its frictional resistance becomes larger than the frictional resistance of the cylindrical piston with respect to the cylinder inner wall surface. The movement becomes uncertain, and the opening and closing of the discharge valve becomes incomplete. This drawback can be easily overcome by increasing the frictional resistance of the cylindrical piston against the cylinder rather than against the stem, but this would require more force to depress the actuating member.

In this proposal, the lower part of the stem is used as a large-diameter cylindrical part with an upper surface closed, and the lower part is watertightly fitted into the upper part of the small-inner-diameter cylindrical part provided in the lower part of the cylinder to increase the allowable range of the stem size and , The inner surface of the cylindrical piston with a small inner diameter is slidably fitted to reduce the contact area.
Therefore, the frictional resistance is small and the lower end surface of the inner cylinder is provided so as to be in close contact with the outer periphery of the upper surface of the large-diameter cylindrical portion and to be separated therefrom, so that the discharge valve hole can be opened and closed by the cylindrical piston. .

"Means for Solving the Problem" The cylinder is hung from the mounting cylinder for fitting the neck and neck of the container body, and the actuating member standing up from the inside of the cylinder is pushed down against the bias to push the upper part of the actuating member. , The auxiliary cylinder fitted to the upper part of the cylinder in a detachable manner, and the operating member fitted to the stem and the cylindrical piston fitted to the lower part of the stem so as to be vertically movable within a certain range, and the upper end of the stem. In the liquid ejector having a discharge valve hole formed in the lower portion of the stem, which is formed by a head with a nozzle that opens and closes when the cylindrical piston moves up and down, the stem portion below the discharge valve hole 15 has a large upper surface blockage. As the outer diameter cylinder portion 14a, the lower portion of the cylinder portion is the cylinder 5
The small inner diameter tubular portion 5a formed in the lower portion is watertightly and detachably fitted to the inner surface of the upper portion, and the engaging projection 16 is provided on the outer surface of the stem portion above the discharge valve hole 15, and the tubular piston 18 is Inner cylinder 20
The small inner diameter portion provided on the upper part of the
Is fitted to the outer surface of the stem portion in a watertight manner and vertically movable, and the lower end surface of the inner cylinder 20 is brought into contact with or separated from the outer periphery of the upper surface of the large outer diameter cylinder portion 14a in a watertight manner, thereby closing the discharge valve hole 15. Further, both skirt-shaped portions 19 and 19 are provided so as to be openable from the outer surface of the inner cylinder to the upper and lower sides of the slant, and the tips of both skirt-shaped portions are watertightly pressed against the inner wall surface of the cylinder.

[Operation] In the state shown in FIG. 1 in which the actuating member 12 is fitted into the push-down auxiliary cylinder 26, the large outer diameter cylindrical portion 14a of the upper surface of the lower portion of the stem 14 is watertightly inserted into the small inner diameter cylindrical portion 5a of the lower portion of the cylinder 5. To fit,
No liquid will leak when the container falls. Since the lower portion of the large outer diameter tubular portion 14a is fitted to the upper inner surface of the small inner diameter tubular portion 5a, the above fitting is possible even if there is some dimensional error in the length of the stem 14.

When the actuating member 12 is lifted by disengaging from the auxiliary cylinder 26, the stem 14 is lifted prior to the cylindrical piston 18, and as shown in FIG. Of the cylindrical piston 18 in watertight contact with the lower end surface of the inner cylinder 20 to close the discharge valve hole 15, and the large outer diameter cylinder portion 14a pushes up the cylindrical piston 18 in the closed state and hangs down from the auxiliary cylinder 26. Part 30
When the upper end of the inner cylinder 20 contacts the lower end, the operating member 12 reaches the upper limit and stops. In this state, the cylindrical piston 18 is held between the large outer diameter cylindrical portion 14a and the cylindrical portion 30 that are biased upward by the spring 13, and the discharge valve hole 15 is kept closed. Then the operating member 12
By pushing down, while the cylindrical piston 18 that is in watertight contact with the inner wall surface of the cylinder is stopped, the stem 14 first descends,
The discharge valve hole 15 is opened when the outer periphery of the upper surface of the large-diameter cylindrical portion 14a is separated from the lower end surface of the inner cylinder 20, and then the engagement ridge 16 pushes down the upper end surface of the inner cylinder 20, whereby the cylindrical piston 18 Also descends. In the lowered state, the discharge valve hole 15 remains open as shown in FIG.

[Example] The injector of the present invention includes a mounting cylinder 1, a cylinder 5, an operating member 12, and an auxiliary cylinder 26.

The mounting cylinder 1 is provided with an inward flange 3 at the upper end of the peripheral wall 2 for screwing the neck of the container body.

The cylinder 5 has a mounting cylinder portion 6 hung from an outer surface of an upper portion thereof via a first outward flange, fitted into the flange hole of the mounting cylinder 1 described above, and attached to the lower end of the mounting cylinder portion 6. 2 The lower surface of the outward flange 7 is engaged with the upper end surface of the mouth / neck portion of the container (not shown) through the packing 8 so that the lower surface of the inward flange 3 and the upper end surface of the mouth / neck portion have the second outward flange 7
To hold. In addition, the lower part of the cylinder 5 is provided with a small inner diameter tubular portion 5a.
In addition, a suction valve 9 is provided in the cylinder portion below the small inner diameter cylinder portion, and further, a suction pipe is provided from the lower end of the cylinder 5.
10 are hung vertically.

The operating member 12 includes a stem 14, a cylindrical piston 18 and a nozzle.
It is composed of a head 23 with 22 and is urged upward by a spring 13. The stem 14 has a lower outer diameter portion as a small outer diameter portion, and a discharge valve hole 15 is bored in the lower portion thereof, and a stem portion below the small outer diameter portion is formed as a large outer diameter cylindrical portion 14a with an upper surface closed. The lower part of the diameter cylindrical portion is watertightly and detachably fitted to the upper inner surface of the small inner diameter cylindrical portion 5a, and a plurality of supporting pieces 14b are radially projected from the upper outer surface of the large outer diameter portion 14a. The tip end surface of the support piece is brought close to the inner surface of the lower portion of the cylinder 5 described above, and a cylindrical piston sliding gap is provided between the tip surface of the support piece and the upper end of the small outer diameter portion having the discharge valve hole 15 to the outer surface of the upper stem portion thereof. An engagement ridge 16 is provided. The small outer diameter portion need not necessarily be provided.

The cylindrical piston 18 is such that the skirt-shaped portions 19 and 19 project from the lower outer surface of the inner cylinder 20 having the small inner diameter portion in the upper part in both obliquely upward and downward outward directions. Is slidably fitted to the outer surface of the stem portion between the upper end of the small outer diameter portion and the engaging projection 16, and the small inner diameter portion is located at the upper end of the small outer diameter portion as shown in FIGS. When approaching, the lower end surface of the inner cylinder 20 is watertightly contacted with the outer circumference of the upper surface of the large-diameter cylindrical portion 14a of the stem to close the discharge valve hole 15, and separates from it to open the discharge valve hole, as shown in FIG. When the upper end surface of the inner cylinder 20 contacts the upper surface of the engaging protrusion 16, the cylindrical piston 18 stops.

The head 23 with the nozzle 22 has a stem fitting cylinder 24 hung from the lower surface thereof fitted to the outer surface of the upper portion of the stem 14 described above.

The auxiliary cylinder 26 has an outer cylinder portion 27 fitted on the outer surface of the upper portion of the cylinder 5 described above, and a screw cylinder portion 29 is hung from the inner peripheral edge of an inward flange-shaped upper wall 28 attached to the upper end of the outer cylinder portion. The screw cylinder portion is screwed onto the outer surface of the stem fitting cylinder 24, and the cylinder body 30 for vertically determining the cylinder piston 18 is vertically provided from the lower end of the screw cylinder portion 29. Inner cylindrical portion 31 hung from the lower surface of the middle portion of the wall 28
Is fitted to the inner surface of the upper portion of the cylinder 5.

[Advantage of the Invention] The present invention is configured as described above, and the actuating member 12 that is urged upward from the inside of the cylinder to stand up is pushed down against the urging and is attached to the auxiliary cylinder 26 that is fitted to the upper portion of the cylinder. The operation member is detachably fitted, and the operating member is formed of a stem, a cylindrical piston that is vertically fitted to a lower portion of the stem so as to be vertically movable within a certain range, and a head with a nozzle that is fitted to an upper end of the stem. In a liquid injector in which a discharge valve hole 15 that opens and closes by vertical movement of a piston is bored in the lower part of the stem, the stem part below the discharge valve hole 15 is made a large outer diameter cylindrical part 14a with an upper surface closed, and the lower part of the cylindrical part is Since the small inner diameter tubular portion 5a provided on the lower portion of the cylinder 5 is watertightly and detachably fitted to the upper inner surface, the lower end of the stem that fits into the small inner diameter tubular portion 5a even if there is some dimensional error in the stem length. The large outer diameter cylindrical part 14a of Does not interfere with the use of. Further, in the liquid injector in which the discharge valve hole formed in the lower part of the stem is opened and closed by the vertical movement of the cylindrical piston fitted to the outer surface of the stem as described above, If the length of the inner cylinder of the cylindrical piston is not larger than the length, the valve hole cannot be completely closed, so the contact area between the inner wall surface of the inner cylinder and the outer surface of the stem, and thus its frictional resistance, also increases. Therefore, the opening and closing of the discharge valve hole due to the vertical movement of the tubular piston should easily become uncertain.
15 An engaging protrusion 16 is provided on the outer surface of the upper stem portion, and the stem portion below the discharge valve hole 15 is set as the large-diameter cylindrical portion 14a, and the stem portion between the discharge valve hole and the engaging protrusion 16 is provided. The small inner diameter portion provided on the upper portion of the inner cylinder 20 of the cylindrical piston 18 is fitted to the outer surface in a watertight manner and vertically movable, and the lower end surface of the inner cylinder is brought into contact with or separated from the outer periphery of the upper surface of the large outer diameter cylinder portion 14a in a watertight manner. As a result, since the discharge valve hole 15 is provided so as to be closed or opened, the vertical length of the small inner diameter portion as the contact portion of the cylindrical piston inner cylinder with the outer surface of the stem is shorter than the vertical length of the discharge valve hole 15. Thus, that is, the contact area, and therefore the frictional resistance, can be made much smaller than in the conventional case. In this way, the opening and closing of the discharge valve hole 15 by the cylindrical piston 18 can be ensured, and the stem and the inner cylinder 20 Of the cylindrical piston against the inner wall surface of the cylinder as the frictional resistance of the cylinder decreases. Since the frictional resistance can be reduced, the pressing operation in the absence of operation becomes easy.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of the injector of the present invention, and FIG.
FIGS. A and b are partially enlarged vertical sectional views of the same embodiment. 5a …… Small inner diameter tube section, 14a …… Large outer diameter tube section

Claims (1)

[Scope of utility model registration request] 1. A cylinder is hung from a mounting cylinder for fitting a neck of a container body, and an actuating member rising from the inside of the cylinder is pushed down against a biasing force so that the upper part of the actuating member is moved to the upper part of the cylinder. With a cylindrical piston that is detachably fitted to an auxiliary cylinder that is fitted to the stem, and the operating member is fitted to the stem and the lower part of the stem so as to be vertically movable within a certain range, and a nozzle that is fitted to the upper end of the stem. A liquid ejector having a head and a discharge valve hole formed in the lower portion of the stem for opening and closing by the vertical movement of the cylindrical piston, and a stem portion below the discharge valve hole 15 has a large outer diameter cylindrical portion with an upper surface closed. As 14a, the lower part of the tubular part is watertightly and detachably fitted to the inner surface of the upper part of the small inner diameter tubular part 5a formed in the lower part of the cylinder 5, and the engaging projection 16 is provided on the outer surface of the stem part above the discharge valve hole 15. The above-mentioned cylindrical piston
The small inner diameter portion 18 provided on the upper portion of the inner cylinder 20 is the discharge valve hole 15 described above.
By fitting the stem portion between the engaging projection 16 and the outer surface of the stem in a watertight manner and vertically movable, the lower end surface of the inner cylinder 20 comes into contact with or separates from the outer circumference of the upper surface of the large outer diameter cylinder portion 14a in a watertight manner. The discharge valve hole 15 cannot be closed or opened, and both skirt-shaped portions 19 and 19 are provided so as to project from the outer surface of the inner cylinder to both the upper and lower sides in a slanted manner, and the tips of both skirt-shaped portions are watertight to the inner wall surface of the cylinder. A liquid ejector characterized by being pressed together.