JPH11262704A - Liquid ejector for both normal and inverted use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a liquid contained in a container from leaking through an atmospheric air introduction hole by forming longitudinally a recess groove extending from the upper part of the lower end pressure contact section of a valve disc to an upper position on the outer cylinder face at a position opposing peripherally to a liquid introduction hole is formed. SOLUTION: In a recess groove (e), a valve disc pressure contact part in the formation part is openable more easily than in the other pressure contact part, and when a liquid is to be ejected from the ejector in an inverted state, atmospheric air to be introduced into a container body through a gap between a valve disc 8 and a cylinder 4 from an atmospheric air induction hole (a) is introduced into a side peripherally opposite to a liquid introduction hole (b). In this case, air to be introduced from the atmospheric air introduction hole (a) freely transfers around a cylinder on account of a gap (d) and reaches the position of the recess groove (e) without hindrance. The air introduced into the container body is mixed into the cylinder 4 through the liquid introduction hole (b), so that the liquid to be ejected contains the mixed air to prevent trouble of generation of variation in the ejection amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid ejector which can be used both upside down.

[0002]

2. Description of the Related Art A cylinder having an upper end fitted to the mouth and neck portion of a container body and hanging down into the container body, an outside air introduction hole formed in an upper part, and a liquid introduction hole for inverting an inverted state is formed below the cylinder. Equipped, with a push-down head with a spout at the upper end of the spout tube protruding from inside the cylinder, and in an upright state or an inverted state,
2. Description of the Related Art There has been known a two-sided liquid ejector having a liquid ejecting mechanism for ejecting a liquid in a container from an ejection port by pushing down a push-down bed.

In these liquid ejectors, when the liquid is ejected in an upright state, the inside of the container is negatively pressured when the liquid is ejected, and an outside air introduction hole is formed between the cylinder and the injection pipe. The outside air is introduced into the container body through.

Further, when the liquid is ejected in the inverted state, the liquid is introduced into the cylinder through the liquid introduction hole for inversion from the inside of the container. Is
Outside air is introduced into the container from between the cylinder and the discharge pipe through the outside air introduction hole. When the liquid is ejected in the inverted state, the stored liquid naturally exists in the container inside the outside air introduction hole portion. However, in a conventional container of this type, the outside air introduction hole is generally formed so that the liquid does not leak. The diameter is reduced to prevent leakage of the liquid to the outside.

[0005]

In a conventional container of this type, when the liquid is ejected when the container is inverted, air introduced into the container enters the cylinder through the liquid introduction hole, and the ejected liquid is discharged. There is a case where an inconvenience of mixing with air occurs.

[0006] The reason for this is that the outside air introduction hole and the liquid introduction hole for inversion drilled in the cylinder are often drilled at the same position in the circumferential direction for manufacturing reasons. It is considered that a phenomenon occurs in which air introduced from the outside air introduction hole below the introduction hole floats above the liquid and enters the liquid introduction hole.

In view of the above, the present invention can reliably prevent the liquid in the container from leaking from the outside air introduction hole,
When the liquid is ejected in an inverted state, regardless of the position of the outside air introduction hole in the circumferential direction with respect to the liquid introduction hole, the outside air always floats to the position opposite to the liquid introduction hole in the circumferential direction, and the liquid is introduced into the liquid introduction hole. The present invention proposes an excellent liquid ejector capable of preventing the mixing of air.

Another object of the present invention is to propose a liquid ejector which has a simple structure and can be manufactured easily and at low cost.

[0009]

According to a first aspect of the present invention, there is provided a liquid ejecting apparatus, wherein an upper end is fitted to a mouth and neck portion of a container body to hang down into a container body and a container is provided at an upper portion. A cylinder 4 is provided which is provided with a hole a for introducing outside air into the body and a hole b for introducing a liquid from the inside of the container at the time of inversion below the hole a, and protrudes from the inside of the cylinder so as to be able to be pushed. Push-down head 7 with spout 6
A liquid ejector having a liquid ejecting mechanism for ejecting the liquid in the container from the ejection port by pushing down the head when erecting or inverting, and a liquid ejector for an upside down dual use. The upper end is fitted and fixed, and a gap d is provided between the inner peripheral surface of the middle part in the vertical direction and the outer peripheral surface of the cylinder, and the inner peripheral surface of the lower end is pressed against the cylinder outer surface below the outside air introduction hole a so that the valve can be opened. A cylindrical valve body 8 is provided, and a concave groove e extending upward from the upper part of the pressure contact portion at the lower end of the valve body is formed vertically on the outer surface of the cylinder at a position opposite to the position where the liquid introduction hole b is formed in the circumferential direction. A liquid ejector characterized by the above feature.

In the liquid ejecting apparatus according to the second aspect of the present invention, instead of the groove e, an outer surface of the cylinder 4 at a position circumferentially opposed to a position where the liquid introduction hole b is formed is disposed below the lower end of the valve body. The liquid ejector according to claim 1 is provided with a concave groove f extending downward therefrom. Further, the liquid ejector according to the third aspect of the invention is provided with a thin portion g in which the lower end pressure contact portion of the valve body at the position circumferentially opposed to the position where the liquid introduction hole b is drilled is formed in place of the concave groove e. The liquid ejecting device according to claim 1 is constituted.

According to a fourth aspect of the present invention, the outer surface of the upper portion of the cylinder 4 at the position opposite to the position where the liquid introduction hole b is formed in the circumferential direction is partially flat, instead of the concave groove e. And
The liquid ejector according to claim 1, wherein a part of the lower end pressure contact portion of the valve body is deformed into a flat plate shape along a flat surface and pressed against the flat surface.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The liquid jetting device of the present invention for both forward and inverted use has an upper end fitted to the mouth and neck portion 3 of the container body 2 to be drooped into the container body, and an external air introducing hole a into the container body at the upper part.
And a cylinder 4 in which a liquid introduction hole b from the inside of the container at the time of inversion is formed below the hole a. It has a push-down head 7 with an outlet 6, and is provided with a liquid ejection mechanism for ejecting the liquid in the container from the ejection port by pushing the push-down head when standing upright or upside down.

The outside air introduction hole a is a hole for introducing outside air into the container body 2 which becomes negative pressure due to the decrease of the stored liquid due to the ejection of the liquid. The outside air introduction hole a is provided when the container body is in the upright state or in the inverted state. , The air passes through the gap between the upper portion of the inner surface of the cylinder and the outer surface of the discharge pipe, and the outside air is introduced from here.

The liquid introduction hole b is provided for supplying the liquid in the container into the cylinder from the liquid when the liquid is ejected in a state where the container is inverted.

According to the present invention, there is provided a liquid ejector of the type described above, which has an upper end fitted and fixed to an outer periphery of a cylinder 4 above an outside air introducing hole a, and an inner peripheral surface of a vertical intermediate portion and an outer peripheral surface of the cylinder. And a cylindrical valve element 8 which is pressed against the outer surface of the cylinder below the outside air introduction hole a so that the inner peripheral surface of the lower end can be opened.
On the outer surface of the cylinder at a position opposite to the drilling position in the circumferential direction, a concave groove e extending upward from the upper portion of the lower end pressure contact portion of the valve body is provided vertically.

The valve body 8 is made of a flexible and elastic material such as an elastomer. By providing the valve body 8, when the liquid is ejected in an inverted state in which the container body 2 is turned upside down, A structure that reliably prevents inconvenience such as leakage of the liquid in the container from the outside air introduction hole a to the outside, and furthermore, when the pressure in the container is reduced to a negative pressure, the valve is opened to supply the outside air to the container smoothly. It was done.

Also, the concave groove e makes it easier for the valve body pressure contact portion of the formed portion to open than the other pressure contact portions, so that when the liquid is ejected in an inverted state, the valve body 8 and the cylinder 4 are connected to each other through the outside air introduction hole a. This is provided so that outside air introduced into the container through the space is introduced into the liquid introduction hole b on the side opposite to the circumferential direction. On this occasion,
The air introduced from the outside air introduction hole a freely moves around the cylinder due to the presence of the gap d, and reaches the position of the concave groove e without any obstacle. By providing such a concave groove e, air introduced into the container enters the cylinder 4 through the liquid introduction hole b, and air is mixed in the ejected liquid, and the discharge amount varies. This is to prevent inconvenience.

In the illustrated example, the valve body 8 has a cylindrical shape, the lower end of which is tapered, and the flange 9 extends outward from the upper edge.
Has been extended. Then, the upper portion of the cylinder wall is closely fitted to the outer periphery of the band-shaped protrusion 10 provided around the upper end portion of the cylinder wall of the cylinder 4, and a gap d is formed between the upper portion of the cylinder wall and the outer surface of the cylinder below the outside air introduction hole. The tip of the tapered part is attached to the outer surface of the cylinder by pressing.

The embodiment shown in FIG. 5 and FIG.
Instead of this, an example is shown in which a groove f is formed vertically on the outer surface of the cylinder 4 at a position opposite to the position where the liquid introduction hole b is formed in the circumferential direction, from the lower part of the valve body lower end pressure contact portion to the lower part. Also in this case, the valve element 8 in the concave groove f forming portion is easier to open than the other portions, and as a result, outside air is introduced into the container from the concave groove f forming portion.

The embodiment shown in FIGS. 7 and 8 has a thin wall in which the lower end pressure contact portion of the valve body at the position circumferentially opposed to the position where the liquid introduction hole b is formed is formed in place of the concave groove e. An example in which a portion g is provided is shown. This thin portion g is easier to open than other portions, and as a result, outside air is introduced into the container from the thin portion g.

Further, in the embodiment shown in FIGS. 9 and 10,
Instead of the concave groove e, the outer surface of the upper part of the cylinder 4 at a position circumferentially opposed to the position where the liquid introduction hole b is formed is partially flat, and a part of the valve body lower end pressure contact portion is along the flat surface. It is configured so that it is deformed into a flat plate and pressed against. In this case, the portion deformed into a flat plate shape along the flat surface h has a lower pressing force than the other portions, and as a result, outside air is introduced into the container from the flat surface contact portion.

Hereinafter, the liquid ejector of the illustrated example will be described in more detail. The container body 2 is configured by erecting the mouth and neck 3 from the upper edge of the cylindrical body via the shoulder.

The cylinder 4 has a mounting cap 14 having an inward flange-like top plate 13 extending from an upper edge of a peripheral wall 12 in which an outward flange 11 protruding from an upper edge of the cylinder 4 is screwed to the outer periphery of the neck 3 of the container body. The lower surface of the flange 11 is fixedly pressed to the upper surface of the neck 3 of the container via the packing 15. Further, an inner cylinder 16 is provided upright from the upper surface of the inner peripheral edge of the top plate 13 of the mounting cap 14, and an outer cylinder 17 is provided outside the inner cylinder 16.

At the lower end of the cylinder 4, there is provided a suction valve 18 having a ball valve mounted on a valve seat, and a pipe 19 is vertically provided at the lower end of the cylinder 4.

A second valve chamber is defined above the suction valve 18 by a tray 20 and communicates with the valve chamber of the suction valve by passages formed on the side and underside of the tray. An upper portion of the second valve chamber has a second valve seat formed on the lower surface of the insertion rod, which will be described later. The second valve chamber communicates with the inside of the cylinder 4 via the lower portion of the insertion rod. Further, a ball-shaped valve body is rotatably fitted in the second valve chamber, and when the container body is inverted, the air suction prevention valve 21 for inverting which shuts off the inside of the cylinder 4 and the second valve chamber. Is formed.

The press-down head 7 includes the inner cylinder 16 and the outer cylinder 17.
A large-diameter cylinder portion 23 having an inner diameter larger than the inner diameter of the cylinder 4 via a passage tube 22 fitted on the back surface side of the top wall, which can be pushed down from the peripheral edge of the top wall. Has been erected. A valve hole is provided at the center of the top wall of the large diameter cylinder.
24 is drilled, and the valve hole communicates with the jet port 6 through a passage provided inside the passage pipe and further on the back side of the top wall. The large-diameter cylinder is inserted into the inner cylinder 16 from below, and
An engaging ridge 25 provided on the outer periphery of the lower end of the 23 is in contact with the lower surface of the locking ridge 26 of the inner cylinder 16 to prevent it from coming out upward, and is provided so as to be able to move up and down with this position as an upper limit.

The discharge pipe 5 has a cylindrical small-diameter piston 27 projecting from the outer periphery of the lower end thereof, and a cylindrical large-diameter piston 28 projecting from the outer periphery of the upper end thereof. It is inserted into the part 23 in a watertight manner. The spout tube 5 also has a skirt-like portion 29 formed in the middle thereof, the outside of which is in contact with the inner wall of the cylinder 4 in a water-tight manner. Also, a rod-shaped valve 30
To protrude. For this purpose, it is preferable to form them with two members as shown in the illustrated example. An engagement step is formed on the inner surface of the small-diameter piston 27, and an insertion rod 31 for narrowing the space protrudes from the lower part of the outer periphery of the small-diameter piston 27 so that the insertion rod 31 is loosely inserted into the injection pipe 5 when the press-down head 7 is pressed down. The outer periphery of the provided flange is fitted and fixed to the inner surface of the cylinder. The injection pipe 5 is urged upward by the elasticity of the coil spring 32 interposed between the engaging step and the lower part of the inner peripheral surface of the cylinder, and the rod-shaped valve body 30 is pressed against the valve hole 24 and pressed down. The head 7 is urged upward. The discharge valve is formed by the valve body and the valve hole.
33 are formed.

The inside of the cylinder 4 below the small-diameter piston 27 and the inside of the large-diameter cylinder portion 23 above the large-diameter piston 28 are communicated by the discharge pipe 5 to form a pressure accumulation chamber.

Next, the operation will be described.
When the pressure is lowered, the pressure accumulating chamber formed by the cylinder 4, the discharge pipe 5, and the large-diameter cylinder portion 23 is pressurized, and a pressure difference occurs due to the diameter difference between the large and small cylinders. The pipe 5 descends and the discharge valve 33 opens. Also, when the head 7 is released, the discharge pipe 5,
The head 7 is pushed up, so that the pressure in the accumulator becomes negative, the suction valve 18 opens, and the liquid in the container flows into the accumulator.

The negative pressure caused by the decrease of the liquid in the container is as follows.
When the discharge pipe 5 is lowered, the valve body 8 is opened from the outside air introduction hole a to introduce and prevent outside air.

Next, when the container body is inverted, when the push-down head 7 is pushed in, the air suction preventing valve 21 for inverting is opened due to the high pressure in the accumulator, and the suction valve 18 is opened.
Is closed, and the injection pipe 5 is raised by the high pressure, and the discharge valve 32 is opened. When the head 7 is released, the discharge pipe 5 is pushed down by the coil spring 32. At this time, since the pressure in the accumulator becomes negative, the inverted air suction preventing valve 21 is closed.
Accordingly, air is prevented from entering the accumulator through the pipe 19 whose tip is exposed above the liquid surface. When the discharge pipe 5 reaches the lower limit (the upper limit in the upright state), it is released from the small-diameter piston 27 and opened, and since the pressure accumulating chamber is in a negative pressure state, the liquid in the container accumulates through the liquid introduction hole b. It flows into the room.

At this time, the valve body is opened from the outside air introduction hole to introduce outside air in the same manner as in the case of erecting, thereby preventing the inside of the container from being negatively pressurized.

The liquid jetting device of the present invention is not limited to the one having the liquid jetting mechanism as in the embodiment shown in FIG. 1 described above. In particular, the cylinder 4 suspended in the container 2 is provided with the outside air introduction hole a. In addition, a specific configuration can be variously selected as long as a liquid introducing hole b is formed and a liquid ejecting mechanism for both forward and inverted use is provided.
Therefore, the present invention is not limited to the one having the pressure accumulating type ejection mechanism as in the above-described embodiment, and may be an ordinary pump type.

Each of the above members is mainly formed of a synthetic resin, and if necessary, may be used in combination with an elastomer, a metal or the like.

[0035]

As described above, the liquid ejector according to the present invention has the above-described structure, and when the liquid is ejected in an inverted state, the liquid in the container leaks to the outside through the outside air introduction hole. Can be reliably prevented.

Also, regardless of the position of the outside air introduction hole in the circumferential direction with respect to the liquid introduction hole, outside air introduced into the container is always introduced from a position circumferentially opposed to the position where the liquid introduction hole is formed. As a result, there is no danger that air will be mixed in from the liquid introduction hole and the discharge amount will vary.

Further, on the outer surface of the cylinder at a position opposite to the liquid introducing hole drilling position in the circumferential direction, a groove extending vertically from the upper portion of the pressure contact portion at the lower end of the valve body to the upper portion thereof, or the liquid introducing hole drilling position. In the case where a groove extending vertically downward from below the pressure contact portion of the valve body is formed vertically on the outer surface of the cylinder at a position opposite to the circumferential direction, it is extremely simple to vertically form a groove at a predetermined position on the outer surface of the cylinder. The structure has the advantages of preventing air from being mixed in the ejected liquid, opening the valve element for a relatively small amount to allow introduction of outside air, and preventing bubbles from being widely dispersed in the liquid as much as possible. .

Further, in the case where the lower end pressure contact portion of the valve body at a position opposite to the position where the liquid introduction hole is formed in the circumferential direction is formed to be thin, a specially configured valve body is attached to this type of conventional ejector. In addition, it has the advantage of manufacturing that it can be formed.

Further, the outer surface of the cylinder at a position circumferentially opposite to the position where the liquid introduction hole is formed is partially flat, and a part of the valve body lower end press-contact portion is deformed into a flat shape along the flat surface. In the case where the valve is configured to be in pressure contact with the valve body, the valve body can be mounted without considering the direction of the valve body.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of a valve body according to the embodiment.

FIG. 3 is an enlarged cross-sectional view of a valve body according to the embodiment.

FIG. 4 is a longitudinal sectional view of a main part of the embodiment in an inverted use state.

FIG. 5 is an enlarged sectional view of a main part of a valve body showing another embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a valve body according to the embodiment.

FIG. 7 is an enlarged cross-sectional view of a main part of a valve body showing still another embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a valve body according to the embodiment.

FIG. 9 is an enlarged sectional view of a main part of a valve body showing still another embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of a valve body portion of the embodiment.

[Explanation of symbols]

2 ... container body, 3 ... mouth and neck, 4 ... cylinder, 5 ... outlet pipe,
6 ... Injection port, 7 ... Press-down head, 8 ... Valve, a ... Outside air introduction hole, b ... Liquid introduction hole, d ... Gap, e ... Concave groove, f ... Concave groove, g ... Thin portion, h ... Flat surface

Claims (4)

[Claims] 1. An upper end is fitted to the mouth and neck portion 3 of the container body 2 to hang down into the container body, and a hole a for introducing outside air into the container body is formed at an upper portion. A cylinder 4 formed with a liquid introduction hole b from the inside of the container body, and a push-down head 7 with a spout 6 at the upper end of an injection pipe 5 protruding from the cylinder so as to be erected or inverted. In a forward / vertical dual-purpose liquid ejector equipped with a liquid ejection mechanism for ejecting the liquid in the container from the ejection port by pushing down the head at the time, the upper end is fitted and fixed to the outer periphery of the cylinder above the outside air introduction hole a. A cylindrical valve body 8 having a gap d between the inner peripheral surface of the middle part in the vertical direction and the outer peripheral surface of the cylinder, and having the lower end inner peripheral surface pressed against the cylinder outer surface below the outside air introduction hole a so that the valve can be opened. And the position of the liquid introduction hole b in the circumferential direction. The cylinder outer surface of the position counter, a liquid ejector, characterized in that formed by Tate設 the grooves e leading to the above the valve body the lower end part pressed top. 2. In place of the groove e, a groove f extending vertically downward from the lower part of the lower end pressure contact portion of the valve body is formed vertically on the outer surface of the cylinder 4 at a position circumferentially opposite to the position where the liquid introduction hole b is formed. The liquid ejector according to claim 1, wherein: 3. A thin wall portion g in which a lower end pressure contact portion of a valve body at a position circumferentially opposed to a position where a liquid introduction hole b is formed is provided in place of the concave groove e. Liquid ejector. 4. In place of the concave groove e, the upper surface of the upper portion of the cylinder 4 at a position circumferentially opposite to the position where the liquid introduction hole b is formed is partially flat, and a part of the lower end pressure contact portion of the valve body is formed. 2. The liquid ejector according to claim 1, wherein the liquid ejector is configured to be deformed into a flat plate shape along a flat surface and pressed against the flat surface.