JPH0511349Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention uses the pressure of the spray liquid in the intermediate chamber formed by the cylinder and the piston to cause the intermediate The discharge valve installed between the passage from the chamber to the outside is opened, and when the piston moves upward, the discharge valve is closed to reduce the pressure in the intermediate chamber, and the spray liquid is transferred to the intermediate chamber by the suction valve. This invention relates to a spray pump designed to suck air into a chamber.

[Conventional technology]

Conventionally, many spray pumps of this type have been disclosed, for example, Japanese Patent Application Laid-open No. 145378/1983, Japanese Utility Model Application No. 53
-There are publications such as No. 103913.

[The problem that the idea aims to solve]

However, conventional spray pumps deform part of the discharge valve by increasing the pressure in the intermediate chamber due to the downward movement of the piston, and open a communication hole for discharging the spray liquid to the outside. be. Therefore, when the pressure in the intermediate chamber is insufficient, the discharge valve may not be completely deformed and the communication hole may not be opened.

In particular, in the early stages of use of this type of product, air enters the intermediate chamber, and this air has more elasticity than liquid, so the pressure applied by the piston is sufficient to deform the discharge valve. As a result, the discharge valve may not be opened, or the opening time of the communication hole may be shortened due to deformation of the discharge valve, and the air in the intermediate chamber may be released unless the piston is pushed down several times. The problem was that it was impossible to do so.

Therefore, in this invention, when the piston moves downward,
It is an object of the present invention to provide a spray pump that can forcibly open the communication hole in addition to opening the communication hole by increasing the pressure in the intermediate chamber.

[Means to solve the problem]

In this invention, a sheath-like piston having a spray liquid discharge passage and a communication hole moves up and down in a cylinder provided between the upper part of the main body and a suction pipe, and the outer peripheral surface of this sheath-like piston moves up and down. An elastic cylindrical discharge valve is attached to the inner peripheral surface of the cylinder so that the communication hole can be closed or opened, and the suction valve and discharge valve are installed at the bottom of the cylinder. In a spray pump in which an intermediate chamber surrounded by a sheath-shaped piston and a cylinder is formed between the sheath-shaped piston and The lower end of the interlocking discharge valve is held at the stage where the sheath piston does not reach the bottom dead center (immediately before reaching the bottom dead center), and even after this holding, the sheath piston is By moving the discharge valve downward, the lower part of the discharge valve is expanded against its elastic force to open the communication hole.

[Effect]

Therefore, when the sheath-like piston is moved downward and the lower end of the discharge valve reaches the locking part, the upper valve may not be opened due to the pressure in the intermediate chamber, or the opening may be incomplete. By moving the sheath-shaped piston further down from this position to the bottom dead center, the lower part of the discharge valve, whose downward movement is restricted by the locking part, is sequentially forced against its elastic force. As the discharge valve expands, the portion of the discharge valve that closes the communication hole moves to open the communication hole.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In Figures 1 to 3, 1 is a cylinder, and a suction pipe 2 is attached to the lower end. Reference numeral 3 denotes the upper part of the main body, which can be attached to and detached from the neck of the container using screws, etc., and the cylindrical part 4 provided in the center is fitted into the upper part of the cylinder 1.
and as one. Reference numeral 5 denotes a suction port, which opens and closes between the intermediate chamber 8 and the inside of the container by means of a suction valve 7 on a ball placed on a valve seat 6. Reference numeral 9 denotes a discharge port, which is connected to the intermediate chamber 8 by a discharge valve 11 that comes into contact with the outside of the communication hole 12 provided in the sheath-shaped piston 10.
Open and close between 4 and 4.

The upper part 13 of the sheath-like piston 10 has a spray liquid discharge passage 14 therein, and a small-diameter fitting cylinder part 16 is formed to protrude from a lower flange part 15. Further, the tube lower part 17 is provided with a fitting recess 19 leaving the upper circumferential part 18 on the upper end surface, and the fitting cylindrical part 16 is provided in the fitting recess 19.
are tightly fitted and integrated. The communication hole 12 of the sheath-like piston 10 is provided in the fitting cylinder part 16 at a position higher than the upper end of the tube lower part 17, and this is formed in the fitting recess 19 upward from the lower end of the fitting cylinder part 16. A cut longer than the depth is provided, and a portion of the cut protrudes from the upper end surface of the lower tube portion 17 to form the discharge port 9. Reference numeral 19a denotes a protrusion formed to protrude from the bottom of the fitting recess 19, and firmly holds the fitting cylindrical portion 16 in the fitted state.

The discharge valve 11 is molded from an elastic member such as rubber, and has a concentric outer cylindrical part 20 and an inner cylindrical part 21 connected by a connecting part 22, and has a closing part 23 at the lower end of the inner cylindrical part 21. It is set up. The inner cylindrical portion 21 of the discharge valve 11 is slightly thinned and is externally mounted on the fitting cylindrical portion 16, and the closing portion 23 is brought into contact with the upper circumferential portion 18 of the lower tube portion 17, and discharge is made outside of the communication hole portion 12. The opening 9 is blocked.

The outer cylindrical portion 20 of the discharge valve 11 has an upper end 20a and a lower end 20b protruding outward, and only the upper and lower ends 20a and 20b are connected to the cylinder 1.
The inner circumferential surface is shaped to slide. Note that the piston cylinder 11 is attached by fitting the fitting cylinder part 16 into the fitting recess 19 after being externally mounted on the fitting cylinder part 16 in advance.

The sheath-shaped piston 10 is urged upward by a coil spring 29 in the intermediate chamber 8, and is in the state shown in FIG. It abuts against the lower end of the cylindrical portion 4 of No. 3 to shut off the inside of the intermediate chamber 8 and the outside of the container, and forms the top dead center of the sheath-like piston 10.

Vertical slit 2 on the inner peripheral side of cylinder 1
A cylinder 1 is provided below the slit 24.
A horizontal hole 26 is provided that passes through the side surface of the housing. At the top dead center of the sheath-like piston 10, both the slit 24 and the horizontal hole 25 are located at the upper and lower ends 20.
It is located between a and 20b.

Reference numeral 26 denotes an upper step portion (locking portion) formed on the inner circumferential side of the cylinder 1. When the sheath-shaped piston 10 moves downward, the lower end 20b of the outer cylindrical portion 21 comes into contact with the so-called sheath-shaped piston 10. form a temporary bottom dead center.
Reference numeral 27 is a lower step section, which is provided a predetermined distance below the upper step section (locking section) 26, and abuts against the tube lower part 17 of the sheath-like piston 10 that has moved further down from the temporary bottom dead center to bring the bottom dead center to the bottom dead center. Form. Reference numeral 28 indicates a plurality of cutout recesses formed in the lower step portion 27, which are connected to the lower tube portion 17 and the lower step portion 2.
7 prevents communication between the upper and lower portions of the intermediate chamber 8 from being cut off.

Here, to explain the usage condition of this spray pump, as shown in FIG. The upper and lower ends 20a, 20
b are in contact with each other, and as described above, the sult 24 and the horizontal hole 25 are located between them.

Subsequently, when the sheath-shaped piston 10 is moved downward, the discharge valve 11 moves to the upper and lower ends 20 as shown in FIG.
a and 20b slide downward on the inner peripheral surface of the cylinder 1. At this time, the upper part of the slit 24 is
The mist comes out from 0a, and the inside of the container and the outside communicate with each other through the lateral hole 25 and the slit 24, so that the reduced pressure caused by the decrease in the contents in the container is appropriately compensated for.

Then, as shown in FIG. 3, the sheath-like piston 10 is further lowered and as the sheath-like piston 10 reaches the temporary bottom dead center (the state in which the lower end portion 20b is engaged with the locking portion 26), the sheath-like piston 10 is lowered. Therefore, the volume inside the intermediate chamber 8 is reduced, and by increasing the pressure, the outer cylinder portion 2
0 is deformed and comes into close contact with the inner circumferential surface of the cylinder 1 between the upper and lower ends 20a and 20b. As a result, the inner cylinder part 2
The lower part of 1 is expanded (pulled outward) by the connecting part 22 to separate the closed part 23 from the upper circumferential part 18 and open the communication hole 12 (discharge port 9). do. Therefore, the spray liquid in the intermediate chamber 8 enters the spray liquid discharge passage 14 and is sprayed to the outside.

Note that the discharge valve 11 is not deformed only when the sheath-shaped piston 10 reaches the temporary bottom dead center, but the pressure of the sprayed liquid in the intermediate chamber 8 is will be released as appropriate due to the increase in

Next, even when the sheath-shaped piston reaches the tentative bottom dead center, an intermediate chamber 8 that only deforms the outer cylinder portion 20 is provided.
If it is not possible to increase the pressure in the discharge valve 1
1 is not deformed, the communication hole 12 (discharge port 9) is not opened, which may cause malfunction of the pump. Particularly in the early stages of product use, the intermediate chamber 8
If the sheath-like piston 10 reaches the tentative bottom dead center, the air contained in the cylinder will not be able to obtain enough pressure to bring the outer cylinder part 20 into close contact with the inner circumferential surface of the valve cylinder 1 by simply compressing the air itself. It creates a situation where you say you can't do it.

Therefore, in such a case, as shown in FIG. 3, by further moving the sheath-like piston 10 downward from the state in which the sheath-like piston 10 has reached the temporary bottom dead center, the sheath-like piston 10 can be moved upward. The outer cylinder part 20 whose downward movement is restricted by the stepped part (locking part) 26 stops the lower part of the inner cylinder part 21 which moves downward by the sheath-shaped piston 10 at the connecting part 22, and is forcibly expanded. As a result, the communication hole 12 (discharge port 9) is opened so that the air in the intermediate chamber 8 can be sent to the spray liquid discharge passage 14.

[Effect of idea]

In addition to opening the communication hole (discharge port) by deforming the discharge valve as the pressure of the contents in the intermediate chamber increases, the spray pump of the present invention also opens the sheath-shaped piston from the temporary bottom dead center. Equipped with two types of communication means to the outside, in which the communication hole is forcibly opened by using the forced deformation of the discharge valve by the locking part on the inner circumferential side of the cylinder by moving it downward. This makes it possible to avoid insufficient deformation of the discharge valve due to insufficient pressure in the intermediate chamber when the sheath-like piston moves downward.Especially in the early stages of product use, the air in the intermediate chamber can be effectively drained. can be continuously released to the outside.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of the spray pump of the present invention when the sheath-like piston is at the top dead center, Fig. 2 is a sectional view of the main part when the sheath-like piston is moved downward, and Fig. 3 is FIG. 3 is a sectional view of a main part showing a case where the sheath-like piston reaches the bottom dead center. 1...Cylinder, 2...Suction pump, 3...
Main body upper part, 4... Cylinder part, 5... Suction port, 6
...Valve seat, 7...Suction valve, 8...Intermediate chamber, 9...
...Discharge port, 10...Sheath-shaped piston, 11...Discharge valve, 12...Communication hole, 13...Pipe upper part,
14... Spray liquid discharge passage, 15... Flange portion, 16... Fitting cylinder portion, 17... Tube lower part, 18...
... Upper circumferential part, 19 ... Fitting recess, 19a ... Protrusion, 20 ... Outer cylinder part, 20a ... Upper end, 20
b...Lower end, 21...Inner cylinder part, 22...Connection part, 23...Closing part, 24...Slit, 25...
...Horizontal hole, 26... Upper step part (locking part), 27...
Lower step portion, 28... cutout recess, 29... coil spring.

Claims (1)

[Claims for Utility Model Registration] A sheath-like piston 10 having a spray liquid discharge passage 14 and a communication hole 12 moves up and down inside the cylinder 1 provided between the upper part 3 of the main body and the suction pipe 2. The upper part of the elastic cylindrical discharge valve 11 is placed on the outer circumferential surface of the sheath-like piston 10 above the communication hole 12, and the outer circumferential surface of the discharge valve 11 is connected to the outer circumferential surface of the cylinder 1. In the spray pump, the spray pump is attached in contact with an inner circumferential surface, and an intermediate chamber 8 surrounded by the sheath-shaped piston 10 and the cylinder 1 is formed between the suction valve 7 and the discharge valve 11. The discharge valve 11 is interlocked with the sheath-shaped piston 10 by a locking portion 26 provided at a predetermined position on the inner peripheral surface of the cylinder 1 forming the intermediate chamber 8.
The lower end of the sheath-like piston 10 is held at a stage before the sheath-like piston 10 reaches the bottom dead center, and even after said holding, the sheath-like piston 10
When the upper part of the discharge valve 11 moves downward, the lower part of the discharge valve 11 expands against its elastic force, and the communication hole 12 becomes open, such as during the initial stage of use. A spray pump characterized in that air remaining in the intermediate chamber 8 is discharged to the outside via the communication hole 12 and the spray liquid discharge passage 14.