JP2002339875A - Valve unit and container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensively manufacturable and easily recyclable valve unit and container of an easy assembly work type and capable of preventing outflow of liquid even when the container falls down. SOLUTION: The valve unit 10 sucks out the liquid in a container body 12. It is provided with a suction pipe 21, a corrugated bellows 22 which can be restored in the extending direction, and a piston part 40 connectively communicated with an upper part of the bellows 22, extending and contracting the bellows 22, and sucking out the liquid in the container 12 via the suction pipe 21. A first check valve 23 is provided upstream of the bellows 22 and a second check valve 24 is provided downstream of the bellows 22. The bellows 22 is made of low density polyethylene, its thickness is formed at 0.1X-0.4X mm when its liquid suction capacity is X cc, and an angle θ of by an external surface of its ridge part 22d is formed at 80±15 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve unit and a container used for a pump type container such as a hair washing agent used at home.

[0002]

2. Description of the Related Art Conventionally, a pump type container has been used as a container for accommodating, for example, a hair washing agent or a detergent used at home. The pump-type container includes a container body and a valve unit that is removably inserted into the container body. Normally, when the piston unit is pressed, the piston unit returns to suck up the liquid from the container body, and then, when the piston unit is pressed, the liquid is discharged from the discharge end of the piston unit. This example is shown in FIGS.
3, the valve unit 1 includes a pipe-shaped valve body 2 removably inserted into a container body (not shown) and an L-shaped pipe-shaped piston portion 3.

[0003] The piston portion 3 is slidably inserted into the valve body 2, between the suction port 4 of the valve body 2 and the piston 5 at the end of the piston portion 3 via the piston portion 3. A liquid container 6 communicating with the atmosphere is formed. A first check valve B is provided on the suction port 4 side of the liquid storage section 6 to allow only the flow of the liquid from the container body side to the liquid storage section 6 side. A second check valve G is provided between the discharge end and the discharge side of the liquid storage unit 6 to allow only liquid to flow from the liquid storage unit 6 to the piston unit 3. Check valve B
And a coil spring 7 is interposed therebetween. The coil spring 7 allows the piston 3
Is urged against the valve body 2 in a direction to increase the volume of the liquid storage section 6. FIG. 12 shows a state in which the piston portion is pushed in as shown by arrows, and FIG.
Reference numeral 3 denotes a state in which the piston portion 3 has returned.

[0004]

However, in the conventional valve unit, since the coil spring 7 must be inserted between the piston 5 and the suction port 4, the assembling operation is troublesome. There's a problem.
In addition, while there is a demand for recycling parts from the viewpoint of protecting the natural environment, the coil spring 7 made of metal usually needs to be disassembled and disposed separately, which is an obstacle to reuse. In addition, since the coil spring 7 is used, there is a problem that the number of assembling steps and the number of parts increase, leading to an increase in cost.

[0005] In a container provided with the valve unit, the liquid in the container body does not usually go out unless the piston portion 3 is pushed. Since the one check valve B and the second check valve G are opened, there is a problem that a liquid flows out of the piston portion 3 in some cases. The present invention has been made in view of the above circumstances, and an object thereof is to provide a valve unit that can be easily assembled, can be manufactured at low cost, can be easily reused, and can prevent the liquid from flowing out even if it falls down. It is to provide a container.

[0006]

According to the present invention, there is provided a valve unit which is inserted into a container body and sucks a liquid in the container body out of the container body. A bellows-like bellows connected to the upper part of the bellows and capable of returning in the extending direction; and a piston part connected to the upper part of the bellows to expand and contract the bellows and suck the liquid in the container body out of the container body through the suction pipe. A first check valve is provided upstream of the bellows, which allows only the inflow of liquid from inside the container body into the bellows, and only the outflow of liquid from inside the bellows to the piston portion downstream of the bellows is provided. An allowable second check valve is provided, and the bellows is made of low-density polyethylene and has a thickness of 0.1X to 0 when the liquid suction capacity is Xcc. It formed in 4Xmm, and was that the angle of the outer surface of the mountain portion θ is formed to 80 ± 15 ° to the solutions of the problems.

According to this valve unit, the bellows is made of low-density polyethylene, the thickness of the bellows is a predetermined thickness corresponding to the liquid suction capacity, and the angle θ formed by the outer surface of the peak is the predetermined angle. Therefore, the bellows expands and contracts without using a metal coil spring, thereby preventing the inconvenience of using the coil spring.

Further, in the valve unit, the bellows is provided with a ratio (d1 / d) of a trough diameter d1 to a peak diameter d2.
2) is preferably (0.9 ± 0.05) X / 3. With such a configuration, the response (responsivity) from the compression of the bellows to the return of the bellows, in particular, becomes faster.

Further, in the valve unit, the piston portion is connected to the upper portion of the bellows and is connected to an upper portion of the shaft case. A piston shaft movably inserted with respect to the piston shaft, and a piston head connected to the upper end of the piston shaft. The piston case is attached to and detached from the shaft case between the shaft case and the piston shaft. A locking portion for locking the piston head is provided, and the piston head is provided with an engaging portion which is engaged with a mouth portion of the container main body and is fixed thereto, and the piston shaft is locked by the locking portion. The second check valve does not interfere with the second check valve, the locking portion is not locked, and the piston head is locked by the engagement portion with the container. When it is fixed the body engage the mouth portion of the here preferably configured to secure the state in which the second closed check valve.

[0010] With this configuration, the piston shaft does not interfere with the second check valve when the locking portion is locked, the locking portion is not locked, and the piston head is not locked. Is engaged with the mouth of the container body by the engaging portion and is fixed thereto, so that the second check valve is fixed in a closed state. By locking the locking portion, the movement of the piston shaft in the shaft case is stopped, the shaft case and the piston shaft are integrated, and the bellows can be operated by the piston shaft. . In addition, when not in use, such as during transfer, by releasing the locking of the locking portion, and by engaging the piston head with the mouth portion of the container body by the engaging portion and fixing it here, The second check valve can be fixed in a closed state, thereby making it possible to prevent the liquid in the container main body from flowing out even when the container main body falls, for example.

Further, a container according to the present invention comprises a valve unit according to any one of claims 1 to 3 and a container body to which the valve unit is detachably attached. According to this container, it is possible to reduce the number of parts and the number of assembling steps for the entire container. In addition, the piston shaft can prevent the liquid in the container main body from flowing out even when the container main body falls down during non-use such as during transfer.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a valve unit and a container according to the present invention will be described in detail. FIG. 1 is a view showing one embodiment of a valve unit of the present invention and a container provided with the valve unit. In FIG. 1, reference numeral 10 denotes a valve unit, and 11 denotes a container. The container 11 has a configuration in which a valve unit 10 is attached to a container body 12 in which a liquid hair washing agent or the like is stored.

The container main body 12 is a cylindrical shape having a bottom and made of a synthetic resin.
Is formed. The male screw 13 is provided in the mouth 12a.
A bush cap 15 made of synthetic resin having a female screw portion 14 screwed into the bush cap 15 is detachably attached, and the valve unit 10 is attached to the container body 11 by attaching the bush cap 15. It has become. The bush cap 15 has an outer cylindrical portion 15a on which the male screw portion 13 is formed, and an inner cylindrical portion 15b which is inserted into the mouth portion 12a of the container body 12 and attached thereto. A hole (not shown) is provided in the container body 12.
Are formed, and the shaft case 16 of the valve unit 10 is slidably inserted through the opening.

A case 17 made of synthetic resin, which is mounted toward the inside of the container body 11, is mounted in the mouth 12a of the container body 12, and the bush cap 15 is mounted on the mouth 12a via the case 17. Have been. In particular, the inner cylindrical portion 15b is screwed to the inner surface of the case 17 and fixed thereto. Further, the inner cylindrical portion 15b of the bush cap 15 and the case 1
7 has an air hole 18 communicating the gap between the inner cylindrical portion 15 b and the shaft case 16 and the inside of the container body 12. Further, an upper portion of the bush cap 15 is formed with a male screw portion 15c for engaging with a piston head described later.

The valve unit 10 includes the case 17
And a synthetic resin bellows unit 19 disposed so as to be inserted into the case 17, and a synthetic resin piston head 20 mounted on the bellows unit 19.
It is provided with. Bellows unit 19
The liquid is inserted into the container body 12 to suck out the liquid in the container body 12 to the outside of the container body 12. The bellows unit 19 is provided with a suction pipe 21 inserted into the container body 12 as shown in FIG. The suction pipe 21 is formed by cutting the suction end 21a at the lower end thereof obliquely.

A bellows 22 having a bellows shape that can return in the extending direction is connected to the upper end side of the suction pipe 21 in a communicating state. The bellows 22 is easily compressed by pressing, and reduces the internal volume. When the pressing force is released, the bellows 22 returns to the original state, that is, easily returns in the extending direction, and reduces the internal volume. It is made of low-density polyethylene configured to increase, has a predetermined spring constant, and has a liquid suction portion inside.

Here, the bellows 22 is shown in FIG.
The capacity difference between the compressed state as shown in FIG. 3 and the state returned from the compressed state as shown in FIG. 3B, ie, the initial expanded state in which no pressing force is applied. Is the liquid suction volume X [cc]. For example, there is a 1 cc type or a 3 cc type in which X is filled according to the type of liquid filled in the container body 12. When the solution is a hair wash, the amount of the hair wash used for one hair wash is usually about 6 cc, so that a 3 cc type bellows 22 is preferably used.

The bellows 22 has a bellows-like cylindrical body having a thickness of 0.1X [mm] or more and 0.4X [m].
m] or less, and preferably 0.5X / 3 [mm] or more and 1.0X / 3 [mm] or less. here,
X indicates the aforementioned liquid suction volume. The angle θ formed by the outer surface of the peak 22d in the bellows shape of the bellows 22 is shown in FIG.
In the initial extended state where no pressing force is applied as shown in FIG.

As described above, the bellows 22 is made of low-density polyethylene (for example, Novatec LL (trade name); Nippon Polychem Co., Ltd., which is a linear low-density polyethylene), and its thickness and peak 22d are formed. Is set in the above-described range, the bellows 22 can be expanded and contracted, that is, returned to the original state by the compression by pressing and the release of the pressing force, without interposing a metal coil spring as in the related art. The return (extension) can be made well.

The bellows 22 has a thickness of 0.1X [m
m], the elastic restoring force becomes insufficient due to being too thin, and the response after compressing the bellows 22, that is, the time required to return to the original state after releasing the pressing force is later than the time in the desired range. This is not preferred. On the other hand, if the thickness exceeds 0.4 X [mm], the pressing force when compressing the bellows 22 exceeds the desired range of pressing force due to being too thick, and the usability deteriorates, which is not preferable.

On the other hand, if the angle θ formed by the outer surface of the peak 22d of the bellows 22 is less than 65 °, the elastic restoring force becomes insufficient and the response becomes slower than the desired range, which is not preferable. , 95 °, the pressing force when compressing the bellows 22 exceeds the desired range of pressing force, which is not preferable.

The bellows 22 is of a type in which the liquid in the container body 12 is pressed and used a plurality of times, for example, the liquid is a shampoo and the bellows 22 has a liquid suction capacity X of 1 cc. The outer diameter of the valley 22e in a bellows shape,
That is, the ratio (d1 / d2) of the valley diameter d1 to the outer diameter at the peak 22d, ie, the peak diameter d2, is set to (0.9 ± 0.0).
5) It is preferably X / 3. When the ratio (d1 / d2) between the valley diameter d1 and the peak diameter d2 is in such a range, the response after the bellows 22 is compressed becomes faster as shown in an experimental example described later. When the liquid is pressed and used plural times, the usability is particularly improved.

The shaft case 16 is fixed to the upper end side of the bellows 22 by press-fitting as shown in FIG. An upstream side of the bellows 22, that is, between the suction pipe 21 and the bellows 22, is provided with a first check valve 23 that allows only the flow of the liquid from the container body 12 into the bellows 22, Bellows 22
, The bellows 22 and the shaft case 16
A second check valve 24 that allows only the outflow of the liquid from inside the bellows 22 to the piston head 20 side is provided between the bellows 22 and the bellows 22.

The first check valve 23 is connected to the suction pipe 21
And a bellows 22 formed integrally with the bellows 22, and the second check valve 24 is provided with the bellows 2
It is formed with a valve chamber 26 integrally formed with the connection portion 22a at the upper end of the second. Here, the connection part 22a at the upper end of the bellows is further provided with a pipe-shaped press-fitting part 22 thereon.
b is formed. The press-fit portion 22b is press-fitted into the shaft case 16 and fixed to the shaft case 16 as described above. The press-fit portion 22b has a guide groove 16a of the shaft case 16 as described later.
Is formed. The bellows unit 19 includes the first check valve 2 as shown in FIG.
The lower opening 17 of the case 17 is provided at 25 locations of the valve chamber 3.
a.

In each of the valve chambers 25 and 26, valve bodies 27 and 28 which can be inserted from the upper opening side of the suction end 21a of the suction pipe 21 or the press-fitting portion 22b of the bellows 22 are arranged. In this example, each of the valve bodies 27 and 28 is made of a synthetic resin having a bowl-shaped portion 27a (28a) that opens toward the downstream side (the shaft case 16 side). In addition, about these valve bodies 27 and 28, lower opening 25a (26a) of valve room 25 (26)
The shape may be spherical or hemispherical, as long as the shape can be closed, and the shape is not particularly limited.

As shown in FIG. 4, both the valve body 27 of the first check valve 23 and the valve body 28 of the second check valve 24 are located outside (below) the central portion of the bowl-shaped portion 27a (28a). Side), a rod portion 27b (28b) extending to the upstream side is formed, and the posture of the bowl-shaped portion 27a (28a) is stabilized by the rod portions 27b (28b). The bowl-shaped portion 27a (28a) has an outer peripheral surface formed in an arc shape, and the outer peripheral surface is in close contact with the inner peripheral surface of the valve chamber 31. Here, the bowl-shaped portions 27a and 28a are made thinner or made of a soft material, so that the sealing properties are enhanced.

The valve body 27 of the first check valve 23 includes:
A V-shaped notch 27c is formed on the periphery of the bowl-shaped portion 27a. And, with such a configuration, the valve body 27
When the first check valve 23 is opened, the liquid or air escapes from the notch 27c. On the other hand, in the second check valve 24, a pair of projections 29, 29 is formed on the downstream side in the valve chamber 26, whereby the valve body 28 is positioned above the projections 29, 29. It does not float. It should be noted that if it is possible to prevent the valve body 28 from being lifted up, these projections 2
Other configurations can be adopted in place of the components 9 and 29. For example, the cross-sectional shape of the valve chamber 26 itself may be an elliptical shape, a square shape, a triangular shape, or another irregular cross-section so that the valve body 28 does not float. Good.

As shown in FIGS. 1 and 2, the shaft case 16 is a pipe-shaped one which is fixedly connected to the bellows 22 by being press-fitted into the press-fitting portion 22b of the bellows 22. , A piston shaft 30 is movably inserted therein. The shaft case 16 has a large-diameter portion 3 extending outwardly in the vicinity of the center of the outer peripheral surface thereof.
1 is formed. As shown in FIG. 1, the large diameter portion 31 functions as a stopper for preventing the bush cap 15 from being lifted up above by contacting the lower end surface of the inner cylindrical portion 15b of the bush cap 15. is there. Further, the shaft case 16 is formed with a projection 32a projecting outward as shown in FIG. 5 on the upper end side of the outer peripheral surface thereof, while the projection 32a contacts the inner surface of the hole of the bush cap 15 with which the projection 32a contacts. A guide groove 32b is formed to engage with the protrusion 32a and guide the protrusion 32a in the vertical direction, that is, from the upper surface side to the lower surface side of the bush cap 15. With such a configuration, the projection 32a and the guide groove 32b form a stopper portion 32 that does not hinder the movement of the shaft case 16 in the insertion direction and suppresses rotation in the circumferential direction.

As shown in FIGS. 1 and 2, the piston shaft 30 has a pair of locking projections 33 formed at opposing positions in the center of the outer peripheral surface. These locking projections 3
Reference numeral 3 denotes a tapered surface 33a on the lower surface side as shown in FIG. 6, which is detachably locked in a locking groove 34 formed in the upper end of the inner peripheral surface of the shaft case 16 as shown in FIG. The locking projection 35 and the locking groove 34 constitute a locking portion 35 of the present invention.

Here, the locking groove 34 has a tapered surface 34a on the upper surface side, whereby the piston shaft 30 is rotated so that the locking projection 33 is locked to the shaft case 16 as described later. When locked in the groove 34, in the initial state of the locked state, the tapered surface 33a and the tapered surface 33b loosen between the locking protrusion 33 and the locking groove 34, but further rotate from now on. As a result, the above-mentioned slack is eliminated, and the locking projection 33 and the locking groove 34 are securely locked. That is,
The locking projection 33 and the locking groove 34 are locked by relatively rotating the piston shaft 30 and the shaft case 16 in one direction, and are locked by rotating in the opposite direction. It is to be released.

The inner peripheral surface of the shaft case 16 has
As described above, the guide groove 16a for engaging with the rib 22c is formed along the length thereof, and the engaging protrusion 33 can be slidably engaged with the guide groove 16a. ing. That is, when the piston shaft 30 is at a position where it is not locked to the shaft case 16, the locking projection 33
Are slidably engaged with the guide grooves 16a. Under such a configuration, the locking projections 33 are not interfered with by the inner peripheral surface of the shaft case 16, and the shaft case 16 can be freely moved up and down.

The lower end of the guide groove 16a (the bellows 22 side) is provided with the bellows 2 as shown in FIG.
The rib 22c formed on the second press-fitting portion 22b is locked, thereby strengthening the connection between the shaft case 16 and the bellows 22, and preventing liquid leakage between them. . The lower end of the piston shaft 30 has a shape and dimensions corresponding to the inner shape of the bowl-shaped portion 28a of the valve body 28 of the second check valve 24 as shown in FIG. The upper end has a small diameter portion 3 for mounting the piston head 20.
6 are formed.

The piston head 20 has an L-shape attached to the upper end of a piston shaft 30, that is, the upper end of a bellows unit 19 having the structure shown in FIG. 2, and as shown in FIG. When the piston head 30 is engaged with the diameter portion 36, that is, when the piston shaft 30 is fixed, the piston head 2 is not fixed thereto.
Only 0 is mounted so that it can rotate freely by applying a certain amount of force. The piston head 20 has a discharge hole 37 communicating with a hole (not shown) of the piston shaft 30.
The opening end of 7 is a discharge port 38 for discharging the liquid.

The piston head 20 has a male screw portion 1 of the bush cap 15 on an inner peripheral surface of a lower portion thereof.
A female screw portion 39 to be screwed into 5c is formed, whereby the piston head 20 is engaged with and fixed to the bush cap 15 as shown in FIG. The internal thread 39 of the piston head 20
The male screw portion 15c of the bush cap 15 serves as an engagement portion for engaging the piston head 20 with the bush cap 15 which is a substantial opening of the container body 12.

Here, such a piston head 20
And the piston shaft 30 and the shaft case 1
6 constitute the piston section 40 of the present invention.
The suction pipe 21, the first check valve 23, the bellows 22, and the second check valve 24 that constitute the bellows unit 19 are integrally formed by blow molding or the like, into which the shaft case 16 and the piston shaft 30 are press-fitted. The case 17 is attached to the bellows unit 19 with the case 17 being extrapolated. The bush cap 15 is attached with the case 17 fixed, and the piston head 20 is attached to the piston shaft 30.
Is attached, the valve unit 10 according to the embodiment of the present invention is assembled and formed.

Next, a method of using the container 11 provided with the valve unit 10 having such a configuration will be described. At the time of normal use, as shown in FIG. 1, first, the piston head 20 is rotated in a predetermined direction in a state where the piston head 20 is pulled upward, the piston shaft 30 is caused to rotate with the piston head 20, and the locking projection 33 is moved. The shaft case 16 is locked in the locking groove 34. At this time, since the locking projection 33 and the locking groove 34 are formed with the tapered surfaces 33a and 34a, respectively, although there is a slack in the initial rotation (the initial locking) as described above, it will be further increased. The rotation eliminates the looseness, and the locking projection 33 and the locking groove 34 are securely locked.

Then, in such a state, the piston head 20 is pushed down to suck out the liquid in the container body 12. Then, the locking projection 33 and the locking groove 34 are firmly locked on the piston shaft 30 connected to the piston head 20 as described above, so that the piston head 20 (piston shaft 30) is lowered. The shaft case 16 is also lowered, and the bellows 22 is compressed as shown in FIG. At this time, if there is no liquid in the bellows 22, the bellows 2
2 is pushed out, whereby the first check valve 23
Of the second check valve 24 opens the lower opening 26a in order to discharge the air in the bellows 22, and the air flows through the shaft. Case 16, piston shaft 30
And is discharged from the discharge port 38 of the piston head 20.

When the bellows 22 is compressed by pushing down the piston head 20 and the air in the bellows 22 is discharged, the inside of the container body 12 becomes negative pressure, but is attached to the opening 12a of the container body 12. Since the bush cap 15 and the case 17 have air holes 18 formed therein, outside air is taken into the container body 12 by the air holes 18, and the inside of the container body 12 becomes the same as the external pressure (atmospheric pressure). Therefore, there is no adverse effect on the compression of the bellows 22 and its return from now on.

Subsequently, when the pressure on the piston head 20 is released, the bellows 22 returns in the extending direction and returns to the state shown in FIG. Then, the valve body 27 of the first check valve 23 opens a lower opening 25a as shown by a two-dot chain line in FIG. 1, whereby liquid is sucked from the container body 12 into the bellows 22, and the inside of the bellows 22 is liquid. Is filled with

Thereafter, as shown in FIG. 10, when the piston head 20 is pressed again, the valve body 2 of the first check valve 23 is pressed.
7 closes the lower opening 25a, so that the bellows 2
The movement of the liquid in 2 toward the container body 12 is prevented. On the other hand, when the bellows 22 is compressed by the pressing of the piston head 20, the liquid in the bellows 22 pushes up the valve body 28 of the second check valve 24 to open the lower opening 26 a and is pushed out into the valve chamber 26. . Then, the liquid pushed into the valve chamber 26 passes through the second check valve 24 and reaches the shaft case 16. Then, this liquid is supplied to the first check valve 23.
The liquid is discharged from the discharge port 38 through the discharge hole 37 of the piston shaft 30 and the piston head 20 without flowing backward to the container body 12.

When the piston head 20 is not used, for example, during transfer, the piston head 20 is previously rotated in a predetermined direction, that is, in a direction opposite to the direction in which the locking projection 33 and the locking groove 34 are locked. The piston shaft 30 is rotated with the piston shaft 30 to release the engagement between the engagement protrusion 33 and the engagement groove 34 of the shaft case 16. Then, in this state, the piston head 20 is pushed down as shown in FIG. 9, and the piston head 20 is put on the bush cap 15. Further, the piston head 20 is rotated in a predetermined direction, and its internal thread 39
Is screwed into the male screw portion 15c of the bush cap 15, whereby the piston head 20 is engaged with the bush cap 15.

At this time, since the piston head 20 is connected to the piston shaft 30 in a fitted state, the operation of the piston head 20 is performed without any trouble. In addition, when the locking between the locking projection 33 and the locking groove 34 is released, the piston shaft 30
Is engaged with the guide groove 16a of the shaft case 16, so that the shaft case 16 does not move with the shaft case 16,
The interior of the shaft case 16 is lowered. Then, at a position where the piston head 20 is screwed and engaged with the bush cap 15, the piston shaft 30 presses the valve body 28 of the second check valve 24 at the lower end thereof, thereby closing the lower opening 26a of the valve chamber 26. Close. Therefore, as described above, the second check valve 24 is closed by screwing the piston head 20 to the bush cap 15 to engage with the bush cap 15, so that, for example, even when the container body 12 The liquid inside is prevented from flowing out.

In the valve unit 10 having such a structure and the container 11 having the same, the bellows 22 is made of low-density polyethylene, and the thickness of the bellows 22 is set to a predetermined thickness corresponding to the liquid suction capacity X. Sato and Yamabe 2
Since the angle θ formed by the outer surface of the 2d is 80 ± 15 °, the bellows 22 can expand and contract well without using a metal coil spring. Because of the good suction, it is possible to avoid the problem of assembling work and the difficulty of separation during recycling that occur when using a coil spring as in the past,
Also, the number of parts and the number of assembling steps can be reduced.

Further, during normal use, the piston head 20 (piston shaft 30) can be operated by locking the locking portion 35 including the locking projection 33 and the locking groove 34. Thus, the bellows 22 can be easily operated. On the other hand, at the time of non-use such as at the time of transfer, the locking of the locking portion 35 is released, and the piston head 20 is engaged with the bush cap 15 serving as the mouth of the container body 12 and fixed thereto. By doing so, the second check valve 24 can be fixed in a closed state by the piston shaft 30, whereby the liquid in the container body 12 flows out even when the container body 12 falls down, for example. Can be prevented.

It should be noted that the present invention is not limited to the above-described embodiment, and various design changes can be made. For example,
In the embodiment, the stopper portion 32 is provided between the bush cap 15 and the shaft case 16 to prevent the shaft case 16 from rotating in the circumferential direction without hindering the movement of the shaft case 16 in the insertion direction. Alternatively, a part of the integrally formed suction pipe 21, the first check valve 23, the bellows 22, and the second check valve 24, for example, forming the first check valve 23 as shown in FIG. The portion may be pressed into the lower opening 17a of the case 17 and fixed there. Even with such a configuration, the locking portion 35 is locked by relatively rotating the piston shaft 30 and the shaft case 16 in one direction, or this locking is released by rotating in the opposite direction. In this case, it is possible to prevent the shaft case 16 from rotating and becoming difficult to rotate.

Also, regarding the configuration of the piston portion 40,
Instead of being composed only of the shaft case 16, the piston shaft 30, and the piston head 20, another member may be added, or another member may be used instead of these members.

(Experimental Example) Four types of bellows 22 were produced with grade UE320 of "Novatec LL (trade name); Nippon Polychem Co., Ltd." which is a linear low-density polyethylene. Each of these four types has a liquid suction capacity X
[Cc] is set to 3 cc, the angle θ formed by the outer surface of the bellows 22d in the bellows shape of the bellows 22 is about 80 °, and the thickness of the bellows-shaped cylinder is in the range of 0.5 to 1.0 mm (the peak portion 22d).
And the valley portion 22e have a difference in wall thickness). Note that these bellows have 15 peaks 22d, and the distance between the vertices of adjacent peaks 22d, that is, the width of the valleys 22e is 4
mm.

Further, with respect to the crest diameter d2, each of the bellows is 18.2 mm, and the crest diameter d1 is 11.0 mm, 12.9 mm, 15.0 mm, 15.0 mm, respectively.
6.4 mm. Thus, the ratio (d1 / d2) between the valley diameter d1 and the peak diameter d2 is as follows. When the valley diameter d1 is 11.0 mm, it is about 0.6, and when the valley diameter d1 is 12.9 mm, it is about 0.7 and the valley diameter d1 is 15.
In the case of 0 mm, it is about 0.8 and the valley diameter d1 is 16.4 mm
About 0.9,

With respect to the four types of bellows thus manufactured, the pressing force (kg) required for the compression and the response time (second) required to return from the compressed state to the original state were measured. The compression by pressing was performed with the container empty, and pressed to the state shown in FIG. 3 (a). FIG. 11 shows the obtained pressing force and response time with respect to the ratio (d1 / d2) between the valley diameter d1 and the peak diameter d2.

FIG. 11 shows that the ratio (d1 / d2) is about 0.9.
It was found that the response time was as fast as about 1 second, so that the usability was particularly improved when the liquid was discharged by the bellows several times. On the other hand, the ratio (d1 /
If d2) is reduced, the response time is slowed down, but the pressing force is reduced. Therefore, in the case where the bellows has a large capacity and thus only one liquid discharging operation is required, the usability may be improved. Do you get it.

[0051]

As described above, according to the valve unit of the present invention, the bellows are made of low-density polyethylene, the thickness of the bellows is set to a predetermined thickness corresponding to the liquid suction capacity X, and the outer surface of the peak is formed. Is made a predetermined angle, the bellows expands and contracts favorably without using a metal coil spring, and therefore the bellows satisfactorily sucks out the liquid in the container body. As a result, it is possible to avoid problems in assembling work and difficulties in separation at the time of recycling, which occur when a coil spring is used, as well as to reduce the number of parts and the number of assembling steps.

Further, the bellows have a valley diameter d1 and a peak diameter d.
2 (d1 / d2) is (0.9 ± 0.05) X / 3
By setting, the response (response) from when the bellows is compressed to when it returns can be increased,
Therefore, in a case where the liquid is discharged by the bellows a plurality of times, the usability can be particularly improved.

Also, a piston-shaped shaft case which is connected to the upper part of the bellows and is connected to the upper part of the bellows, and which is held at the mouth of the container body, is movably inserted into the upper part of the shaft case relative to the shaft case. And a piston head that is connected to the upper end of the piston shaft and is connected between the shaft case and the piston shaft. The piston head is provided with an engaging portion that engages with the mouth of the container main body and is fixed thereto, and the piston shaft is configured to lock the second portion when the locking portion is locked. Without interfering with the check valve, the locking portion is not locked, and the piston head is engaged with the mouth portion of the container body by the engaging portion and is fixed thereto. When the second check valve is configured to be fixed in a closed state when the piston shaft is moved during normal use, the locking portion is locked to move the piston shaft in the shaft case. And the shaft case is integrated with the piston shaft, and the bellows can be easily operated by the piston shaft. Also, when not in use, such as during transportation,
The second check valve is fixed in the closed state by releasing the locking of the locking part and engaging the piston head with the mouth of the container body by the engaging part and fixing it here. Thus, for example, even when the container body falls down, the liquid in the container body can be reliably prevented from flowing out.

Since the container of the present invention includes the above-mentioned valve unit and a container body to which the valve unit is detachably attached, the number of parts and the number of assembling steps can be reduced as a whole container. Further, the piston shaft can prevent the liquid in the container main body from flowing out even when the container main body falls down during non-use such as during transfer.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of an embodiment of a valve unit of the present invention and a container provided with the valve unit.

FIG. 2 is a side sectional view of a bellows unit in the valve unit shown in FIG.

FIG. 3 is a diagram for explaining a liquid suction volume,
(A) is a figure which shows the state in which the bellows was compressed, (b) is a figure which shows the initial expanded state which returned from the compressed state.

FIG. 4 is a side sectional view of an essential part for explaining a schematic configuration of a first check valve and a second check valve in the valve unit shown in FIG. 1;

FIG. 5 is a diagram for explaining a stopper portion between the bush cap and the shaft case, and is a diagram showing A-
It is an arrow A view.

FIG. 6 is a side view of a piston shaft.

FIG. 7 is a sectional side view of a main part of a shaft case.

FIG. 8 is a diagram for explaining an engagement state between a rib of a press-fitting portion of the bellows and a guide groove of a shaft case, and FIG.
It is an arrow BB view.

9 is a side sectional view showing a state of the container shown in FIG. 1 when liquid leakage is prevented at the time of transfer or the like.

FIG. 10 is a side sectional view for explaining a use state of the container shown in FIG. 1;

FIG. 11 is a graph showing a relationship between a pressing force and a response time with respect to a ratio (d1 / d2).

FIG. 12 is a schematic configuration diagram of an example of a conventional container, and is a side sectional view showing a lowered state of a valve unit.

FIG. 13 is a schematic configuration diagram of an example of a conventional container, and is a side sectional view of a valve unit in an ascending state.

[Explanation of symbols]

10: valve unit, 11: container, 12: container body,
15 bush cap, 15c male screw part, 16 shaft case, 16a guide groove, 17 case, 18 ...
Air hole, 20: piston head, 21: suction pipe, 22: bellows, 22d: peak, 22e: valley, 2
Reference numeral 3 denotes a first check valve, 24 denotes a second check valve, 30 denotes a piston shaft, 33 denotes a locking projection, 34 denotes a locking groove, 35 denotes a locking portion, and 39 denotes a female screw portion (engaging portion). ), 40 ... piston part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04B 23/00 F04B 21/02 G 23/02 B65D 83/00 BRLK 43/08 BSF 53/00 F04B 21 / 02F 21/00 NF term (reference) 3E014 PA01 PB03 PC03 PC12 PD12 PD15 PD22 PE30 PF03 PF04 3H071 AA01 BB01 BB05 CC32 CC34 CC35 CC36 DD04 DD12 DD13 DD14 DD72 DD74 DD75 EE08 3H077 AA08 BB03 CC04 CC07 DD04EE36 EE37 EE37 EE37 EE37 FF12 FF22 FF54 FF60

Claims (4)

[Claims] 1. A valve unit which is inserted into a container main body and sucks a liquid in the container main body out of the container main body, wherein the suction pipe inserted into the container main body can be returned to an extending direction connected to and connected to an upper portion of the suction pipe. A bellows having a bellows-like shape, and a piston portion communicating with the upper part of the bellows to expand and contract the bellows, and to suck the liquid in the container body out of the container body via the suction pipe. Providing a first check valve that allows only the inflow of liquid from inside to the bellows, and providing a second check valve that allows only the outflow of liquid from inside the bellows to the piston portion downstream of the bellows The bellows is made of low-density polyethylene and has a thickness of 0.1X to
A valve unit, wherein the valve unit is formed to have a size of 0.4Xmm and an angle θ formed by the outer surface of the crest is 80 ± 15 °. 2. The bellows has a valley diameter d1 and a peak diameter d.
2 (d1 / d2) is (0.9 ± 0.05) X / 3
The valve unit according to claim 1, wherein the valve unit is formed as: 3. A pipe-shaped shaft case connected to an upper part of a bellows and held at an opening of a container body, wherein the piston part is movably mounted on an upper side of the shaft case with respect to the shaft case. A pipe-shaped piston shaft inserted therein, and a piston head connected to an upper end of the piston shaft, the piston head being detachably engaged with the shaft case between the shaft case and the piston shaft. The piston head is provided with an engaging portion that engages with the mouth portion of the container main body and is fixed thereto. The piston shaft is configured such that the piston shaft is locked when the locking portion is locked. Without interfering with the check valve, the locking portion is not locked, and the piston head is engaged with the mouth portion of the container body by the engaging portion and is fixed thereto. The valve unit according to claim 1, wherein the second check valve is configured to be fixed in a closed state when the valve is in a closed state. 4. A container comprising: the valve unit according to claim 1; and a container body to which the valve unit is detachably attached.