JPS63377Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small liquid ejection device that is attached to a container or the like and injects relatively high viscosity liquid such as milky lotion in a substantially fixed amount at a time. It is an object of the present invention to provide a liquid ejecting device having a clogging prevention mechanism attached to a tip portion thereof to prevent clogging of a nozzle hole.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is a container containing a liquid such as emulsion, and 2 is an attachment member such as a cap that is liquid-tightly fitted to the mouth of the container 1 by screwing or fitting. The end face is opened to a small diameter. A vertically long cylindrical cylinder 3 whose upper end is fixed to the inner wall of the mounting member is suspended within the mounting member 2, and a small diameter bottom 4 at the lower end of the cylinder 3 is a suction pipe suspended in the liquid. 5 The upper end is fixed. The opening at the upper end of the suction pipe 5 forms a valve hole 6, and this valve hole 6 is closed by a suction valve 7 having a tongue-shaped valve portion cut into a flexible plate.

On the other hand, in the opening of the mounting member 2, there is a stem 10 fixed to an ejection head 9 having a nozzle pipe 8 at the upper end.
is inserted so that it can move up and down. The lower end of the stem 10 inside the mounting member 2 is enlarged in diameter, and this enlarged diameter portion prevents the stem 10 from slipping out of the mounting member 2. A cylindrical piston 11 that slides within the cylinder 3 is fixed to the stepped inner surface of the lower end of the stem 10, and a coil spring 12 is inserted between the lower end surface of the piston 11 and the suction valve 7. , this spring 12 is connected to the stem 10 via the piston 11,
The spouting head 9 is constantly pushed upward. Further, a spherical discharge valve 13 is loosely fitted into the upper end opening of the piston 11 to seal the opening. There is a narrow diameter portion 14 in the stem 11 above the discharge valve 13, and the discharge valve 13 is prevented from moving upward beyond the narrow diameter portion 14.

A clogging prevention mechanism 15 is attached to the tip opening of the nozzle tube 8 to prevent clogging of the nozzle hole. That is, a cap-shaped nozzle hole member 17 is inserted and fixed into the opening at the tip of the nozzle pipe 8, the tip of which is closed, and several nozzle holes 16 are opened in the circumferential direction in the peripheral wall near the closed tip. 17 On the outer surface, a clogging prevention mechanism 1 consisting of a cylindrical elastic body 18 is provided.
5 are fitted tightly together, and the nozzle hole 16 is always hermetically sealed with the elastic body 18.
The cylindrical elastic body 18 has an outward flange 19 formed at its rear end base, an engagement circumferential strip protruding from the inner periphery of the flange 19, and the engagement circumferential strip inserted into the circumferential groove on the outer periphery of the nozzle hole member 17. It is fitted and fixed in place, and the tip is attached so that it can expand outward.

Next, the operation of the above device will be explained. During normal operation, the cylinder 3 is almost filled with liquid sucked up through the suction valve 7, and the nozzle hole 16
is hermetically sealed by a cylindrical elastic body 18.
In this state, when the piston 11 is pushed down through the stem 10 by the jet head 9 against the spring 12, the piston 11 has its upper end opening sealed by the discharge valve 13, so the downward movement causes the piston 11 to When the liquid pressure within the cylinder increases and this liquid pressure reaches a specified value, the discharge valve 13 is pushed upward, and the liquid within the cylinder 3 is injected toward the nozzle pipe 8 through the gap between the discharge valve 13 and the stem 10. Ru. Then, due to the injection pressure of this injected liquid, the cylindrical elastic body 18 is pushed outward as shown by the broken line in the figure, and the nozzle hole 16 is expanded.
Since the nozzle hole 16 is opened, the injected liquid is jetted outward from the nozzle hole 16. When the depressing operation is stopped when the liquid in the cylinder 3 is almost injected, the ejection head 9, stem 10, and piston 11 are returned to the illustrated state by the spring 12, but on the other hand, when the liquid injection is completed, the inside of the cylinder 3 becomes negative. Since the liquid in the container 1 is pressurized, it flows into the cylinder 3 through the suction pipe 5 and the suction valve 7, and one cycle of the injection operation is completed.

In this type of liquid ejecting device, if the liquid is a highly viscous emulsion or the like, when the liquid is ejected, there is a high risk that the liquid will adhere to the nozzle hole and solidify, causing clogging. However, in the present invention, the cylindrical elastic body 18 serving as a clogging prevention mechanism is closely fitted around the nozzle hole member 17 at the tip opening of the nozzle pipe 8, and the elastic body 18 expanded upon completion of liquid injection is returned to its original position. Since the nozzle hole 16 is hermetically sealed, the liquid adhering to the nozzle hole 16 can be prevented from drying and solidifying, and therefore the nozzle hole 16 can be prevented from clogging.

2 to 4 show other different clogging prevention mechanisms 15. In the one shown in FIG. 2, the nozzle hole member 17 is inserted into the nozzle pipe 8 and inserted into the nozzle pipe 8, and from the tip of the cylindrical body part 20, there are several legs 2 at appropriate intervals in the circumferential direction.
1 is extended, and a block 22 is fixed to the tips of these legs 21, and the space between the legs 21 is used as a nozzle hole 16. On the other hand, the cylindrical elastic body 18 is provided with an outwardly bent part 23 in the middle, and has an opening at the tip. The nozzle hole 16 is sealed by air-tightly fitting from the front surface of the small diameter portion of the tip of the block 22, and when liquid is injected, the ejected liquid pushes and stretches the elastic body 18 forward, thereby directing the liquid to the nozzle hole 16 and the elastic body 18. It is ejected outward from the tip opening.

In the one shown in FIG. 3, the nozzle hole 16 is provided downward near the tip of the nozzle tube 8, and the opening at the tip of the nozzle tube 8 is closed with an end plate 25 in which a guide tube 24 is bored from the inside surface. The guided sealing plate 26 is biased toward the ejection head 9 side by a spring 27 to airtightly seal the nozzle pipe 8 and the nozzle hole 16, and when liquid is ejected, the injection liquid is sealed against the spring 27. The plate 26 is pushed toward the tip of the nozzle tube to open the passage from the nozzle tube 8 to the nozzle hole 16, and the liquid is injected outward from the nozzle hole 16.

In the one shown in FIG. 4, a column 28 is provided at the rear end of a cylindrical nozzle hole member 17 which is inserted and fixed into the tip opening of the nozzle tube 8 so as to extend the nozzle tube 8. A serpentine spring 27 is extended from the spring 27, and a sliding sealing plate 26 is fixed to the tip of the spring 27 to airtightly seal the inner hole of the nozzle hole member 17, which is the nozzle hole 16. The sealing plate 26 is pushed out against the spring 27 to the outside of the nozzle hole member 17 to open the nozzle hole 16, and the liquid is injected outward from the nozzle hole 16. In this example, several guide rods that slide into contact with the inner peripheral surface of the nozzle hole member 17 are projected inward from the inner peripheral edge of the sealing plate 26, and after the liquid injection is completed, the sealing plate 26 is attached to the guide rods. It is preferable that it be guided so that it returns smoothly and reliably into the nozzle hole member 17. The embodiments shown in FIGS. 2 to 4 can achieve the same purpose as the example shown in FIG.

As described above, in the present invention, the clogging prevention mechanism 1 includes the sealing plate 26 biased by the cylindrical elastic body 18 or the spring 27 depending on the position of the nozzle hole 16.
5, the nozzle hole 16 is hermetically sealed, and at the time of liquid injection, the clogging prevention mechanism 15 is displaced by the injection liquid, the nozzle hole 16 is opened and the liquid is ejected, and the mechanism is automatically returned when the liquid injection is completed. Since the nozzle hole 16 is hermetically sealed, the nozzle hole 16 can be hermetically sealed each time liquid injection is completed, and therefore the nozzle hole 1
It is possible to provide a liquid ejecting device that can prevent the liquid from drying and solidifying even if the liquid adheres to the nozzle hole 16, thereby preventing the nozzle hole 16 from clogging.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing the main parts of the liquid ejection device of the present invention, FIGS. 2 to 4 show different nozzle hole clogging prevention mechanisms of the same liquid ejection device, and FIG. 3 is a longitudinal sectional view, and FIG. 4 is a partially cutaway perspective view. DESCRIPTION OF SYMBOLS 1... Container, 3... Cylinder, 8... Nozzle pipe, 9... Ejection head, 15... Clogging prevention mechanism, 16... Nozzle hole.

Claims (1)

[Scope of utility model registration request] A cylinder 3 is installed vertically from the upper inner surface of a mounting member 2 that can be fitted into the mouth of a container.
Inside is a stem 10 that penetrates the top wall of the mounting member 2.
A cylindrical piston 11 attached to the lower end is fitted, and an ejection head 9 with a nozzle pipe 8 is fitted to the upper end of the stem 10.
is installed, and a suction valve 7 is installed at the bottom of the cylinder.
In a liquid ejecting device in which a discharge valve 13 is provided in the stem 10 or the cylindrical piston 11, the tip of the nozzle pipe 8 is formed of a cylindrical elastic body 18 or a sealing plate 26 biased by a spring 27. A nozzle hole 16 is hermetically sealed in the part, and when liquid is injected,
A liquid injection device equipped with a clogging prevention mechanism 15 that is displaced by injection liquid to open a nozzle hole 16 and returns when liquid injection is stopped to airtightly seal the nozzle hole 16.