JP3655419B2 - Liquid dispensing pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid dispensing pump.
[0002]
[Prior art]
For example, Japanese Patent Application Laid-Open No. 8-268458 is provided with a mounting cap that fits into the mouth and neck of the container body, and a ball valve that forms a suction valve in the lower end portion that is fixed to the container body by the cap and suspended into the container body A cylinder, an auxiliary spring that normally urges the ball valve in the valve closing direction, a stem that protrudes from an outer peripheral lower portion of an annular piston fitted in the cylinder, and a vertically movable stem; A press-down head with a nozzle fitted to the top, a ball valve that forms a discharge valve provided in the upper part of the stem, and a coil spring that urges the stem upward. The liquid in the container is ejected from the nozzle through the discharge valve, and the liquid in the container is sucked into the cylinder through the suction valve by raising the push-down head with the nozzle. Out pump is disclosed.
[0003]
[Problems to be solved by the invention]
In the above conventional example, when the push-down head with the nozzle is pushed down, the pressure in the cylinder is increased, whereby the ball valve is pushed upward, thereby opening the discharge valve and ejecting the liquid in the cylinder. After the ejection, the pressing head with nozzle starts to rise due to the urging force of the coil spring, and the raising of the pressing head causes negative pressure in the cylinder, thereby opening the suction valve and the ball valve forming the discharge valve. Since the discharge valve is closed almost immediately at the same time as the press-down head with the nozzle starts to rise, the liquid remaining in the nozzle is not sucked into the cylinder and drops from the nozzle immediately after the press-down of the press-down head. there were.
[0004]
Further, in the above-described conventional example, the suction valve requires an auxiliary spring for urging it in the seating direction in addition to the ball valve placed on the suction valve seat, and therefore the number of members must be increased. It was expensive.
[0005]
Further, in the above conventional example, a ball valve is used as a valve body for forming a discharge valve and a suction valve as described above. Usually, a metal is used as a material of the ball valve, while other members are made of synthetic resin. However, it is difficult to separate the metal material and the synthetic resin material from the viewpoint of recycling.
[0006]
In the liquid dispensing pump according to claim 1, the valve plate of the discharge valve body is placed on the tapered discharge valve seat, the engagement plate is engaged with the inner surface of the upper portion of the stem, and the valve plate of the suction valve is tapered. By placing the elastic plate on the lower surface of the engaging projection on the inner surface of the holding cylinder while placing it on the suction valve seat, the discharge valve body is discharged in a tapered manner almost simultaneously with the start of negative pressure in the cylinder due to the rise of the operating member. Even after the negative pressure is reached, the nozzle and the inside of the cylinder are communicated without being seated on the valve seat, so that the negative pressure degree is slightly lowered, thereby the tapered suction valve seat of the suction valve body. At this time, the separation from the nozzle is slightly delayed from the start of negative pressure, and at the same time, residual liquid is sucked from the nozzle into the cylinder within this delay time, thereby preventing liquid dripping and reducing the negative pressure in the cylinder. The suction valve body is automatically seated on the tapered suction valve seat without using other members such as a spring by utilizing the elastic deformation resistance of the elastic plate itself, thereby reducing the number of members. It is intended to be illustrated.
[0007]
The liquid pouring pump according to claim 2 has a problem to be solved by the liquid pouring pump according to claim 1, and difficult separation by integrally forming the discharge valve body and the suction valve body with a synthetic resin material, respectively. It is intended to eliminate disposal.
[0008]
[Means for Solving the Problems]
As a first means, a cylinder A that is suspended by engaging an outward flange 3 attached to the upper part of the lower surface of the inward flange 4 at the upper end of the mounting cylinder 1 to be fitted to the outer surface of the container body neck portion 2;
An actuating member B having a cylindrical piston 14 at the lower end of the stem 15 and fitted with a pressing head 19 with a nozzle 23 on the upper outer surface of the stem 15; ,
A discharge valve 28a is formed by placing the upper lower outer surface of the valve plate 27 that is expanded upward and outward from the upper end of the valve rod 26 on the lower small diameter tapered discharge valve seat 16 attached to the upper inner surface of the stem 15. And a discharge valve body C in which tips of a plurality of engagement plates 28 projecting radially outward from the lower end of the valve stem are engaged with the upper inner surface of the stem 15;
A holding cylinder 6a is erected from the cylinder peripheral wall below the sliding portion of the cylindrical piston 14 via an inward flange, and a lower small diameter tapered suction valve seat 6c is attached to the inner surface of the holding cylinder. An upper lower outer surface of the valve plate 30 that is expanded upward and outward from the upper end of the valve rod 29 is placed on the tapered suction valve seat to form a suction valve 31a, and from the lower end of the valve rod 29 upward and outward. A suction valve body D is formed by engaging the ends of a plurality of elastic plates 31 that are radially extended and projecting with the lower surface of the engaging projection 6d formed on the inner surface of the holding cylinder 6a.
[0009]
The second means includes the first means, and the discharge valve body C and the suction valve body D are integrally formed of a synthetic resin material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of the liquid dispensing pump according to the present invention when not in use, FIG. 2 is a perspective view of an open / close cylinder for opening and closing a nozzle, and FIG. 3 is a perspective view of a valve body forming a discharge valve and a suction valve. FIG.
The liquid dispensing pump according to the present invention includes a cylinder A, an operation member B, a discharge valve body C, and a suction valve body D as main components. Hereinafter, these will be sequentially described.
[0011]
In FIG. 1, reference numeral 1 denotes a mounting cylinder that is fitted to the outer surface of the container body neck portion 2.
A is a cylinder, and the cylinder A is suspended in the container body by engaging the outward flange 3 attached to the upper end portion with the lower surface of the inward flange 4 at the upper end of the mounting cylinder 1, and the cylinder A is disposed above the container body. An outside air introduction hole 5 communicating with the inside of the mouth and neck 2 is provided.
[0012]
Furthermore, the cylinder A has an inward flange at its lower end, and a through cylinder 6 is provided through the inner end of the inward flange. The through cylinder 6 has a through cylinder 6 cylinder portion above the inward flange serving as a holding cylinder 6a for holding a suction valve body D described later, and a through cylinder cylinder portion below the inward flange. Serves as a pipe fitting cylinder 6b for fitting the suction pipe.
[0013]
The holding cylinder 6a is positioned below a cylinder sliding portion of a cylindrical piston 14 which will be described later, and has a lower-diameter tapered suction valve seat 6c on the inner surface of the upper end thereof and extends vertically on the inner peripheral surface thereof. A plurality of protruding ridges 6d are provided in the circumferential direction at predetermined intervals. The protrusion 6d is for engaging an elastic plate 31 of a suction valve body D, which will be described later. Therefore, the protrusion 6d is not limited to the protrusion, and may be an inner wall wider than this, and the number thereof is an elastic plate. It may be the same number as 31.
[0014]
In the present embodiment, the protrusion 6d or the inner wall spaced in the circumferential direction is used as a means for engaging the elastic plate 31, but in these cases, the suction valve element D is used to engage the lower surface of the protrusion or the inner wall. Since the elastic plate 31 needs to be positioned by rotating in the circumferential direction, it is more preferable to use an annular inner wall extending over the entire circumference.
[0015]
Further, the cylinder A is formed with a plurality of ribs 7 extending vertically on the inner peripheral surface of the lower end thereof at predetermined intervals in the circumferential direction. The rib 7 holds the holding cylinder 6a and a lower part of a later-described coil spring 18 positioned therebetween so that the rib 7 can expand and contract.
[0016]
Reference numeral 8 denotes a member with a screw cylinder, and the member 8 with a screw cylinder includes a double cylinder of an inner cylinder 10 and an outer cylinder hanging from the lower surface of the flange-shaped top plate 9. The engaging ridge provided is engaged with an engaging groove provided vertically on the inner surface of the cylinder upper end 11, and the fitting cylinder 12 suspended from the inner surface of the lower end of the inner cylinder 10 is fitted to the inner surface of the cylinder A. It is fitted so that it cannot be pulled out.
[0017]
The inner cylinder 10 has an internal thread 13 on the inner surface of the upper end portion, and the lower end portion of the fitting cylinder 12 is a lower small diameter tapered cylinder portion. The tapered cylinder portion is formed into a cylindrical piston 14 at the upper limit position of the operating member B described later. And the stem 15 can be contacted freely.
[0018]
B is an actuating member, which has a cylindrical piston 14 at the lower end of the stem 15 fitted into the cylinder A by being biased upward, and a pressing head 19 with a nozzle is fitted to the upper outer surface of the stem 15. Yes.
The cylindrical piston 14 is fitted to the inner surface of the cylinder A with the outer peripheral edges of the upper and lower end surfaces in an airtight and freely movable manner. An inward flange protrudes from the inner peripheral surface of the cylindrical piston 14, and a stem 15 protrudes upward from the inner peripheral edge of the inward flange. The stem 15 has a lower small-diameter tapered discharge valve seat 16 on the inner surface of the upper end, and a small outer-diameter portion 17 for fitting a pressing head 19 with a nozzle to be described later on the outer surface of the upper end.
[0019]
The upper end of the coil spring 18 is engaged with the lower surface of the inward cylinder forming the connecting portion between the stem 15 and the cylindrical piston 14 to urge the cylindrical piston 14 upward.
As described above, the cylindrical piston 14 slides in the cylinder A so as to be movable up and down, and the upper limit position of the sliding portion in the cylinder is the tapered cylindrical portion at the lower end portion of the fitting cylinder 12 where the cylindrical piston 14 abuts. At the lower end, the lower limit position is set at the upper end of the rib 7, respectively.
[0020]
The push-down head 19 with a nozzle has a peripheral wall 20 and a drooping cylinder 21 that hangs down from the upper end of the peripheral wall via an inward flange, and the drooping cylinder 21 has a screw cylinder suspended from the lower end via a flange-shaped bottom wall. Yes. The outer surface of the screw cylinder is formed with a male screw 22 that can be screwed into the female screw 13, and the inner surface of the screw tube is fitted to the outer surface of the small outer diameter portion 17 of the stem 15.
[0021]
Further, a discharge hole 24 for connecting the base of the nozzle 23 is formed on the peripheral surface of the drooping cylinder 21. Further, an opening / closing cylinder 25 for opening and closing the nozzle shown in FIG. It is fitted. The open / close cylinder 25 having an open bottom surface has an inverted U-shaped opening on the circumferential surface, and the discharge hole 24 is opened / closed by the rotation position of the open / close cylinder 25. The open / close cylinder 25 has a knob for closing the upper surface of the open / close cylinder 25 by the top wall and for rotating the open / close cylinder 25 on the upper surface of the top wall.
[0022]
C is a discharge valve body, and FIG. 3 shows a state before assembly to the stem 15. As shown in the figure, the discharge valve body C is provided with a valve plate 27 that is expanded upward and outward from the upper end of the valve stem 26 and a protruding projecting radially outward from the lower end of the valve stem 26 before assembly. And a plurality of engaging plates 28.
[0023]
When the discharge valve body C is assembled to the stem 15, the engagement plate 28 is bent upward from its base and its tip is slidably brought into contact with the inner surface of the upper end of the stem. The outer surface is placed on the tapered discharge valve seat 16 to form the discharge valve 28a, and the engagement plate 28 moves to the lower surface of the tapered discharge valve seat 16 when the discharge valve body C is raised when the pressure inside the cylinder A is increased. The upper limit of the discharge valve body C is determined so as to be engaged.
[0024]
In the present embodiment, a tapered tube having a small lower diameter is adopted as the upper / outwardly expanding valve plate 27, and the engaging plate 28 is expanded from the lower end of the valve stem to the lower outer side as described above. However, the engaging plate 28 may be bent upward when assembling the stem 15 in this case. The tip of the lever is slidably brought into contact with the inner surface of the upper end of the stem.
[0025]
D is a suction valve body, and, similar to the discharge valve body C, as shown in FIG. 3, before assembling to the holding cylinder 6 a, a valve plate 30 that is expanded from the upper end of the valve stem 29 upward and outward, 29 has a plurality of elastic plates 31 projecting radially outward from the lower end.
[0026]
When assembling the suction valve body D to the holding cylinder 6a, the elastic plate 31 is bent upward from its base and its tip is engaged with the lower surface of the protrusion 6d, and the upper lower outer surface of the valve plate 30 is tapered. The suction valve 31a is formed by placing it on the suction valve seat 6c.
[0027]
As in the above, also in this embodiment, a lower small-diameter tapered cylinder is adopted as the valve plate 30 that expands upward and outward, and as the elastic plate 31, as described above, from the lower end of the valve stem to the lower outer side. However, the elastic plate 31 may be provided so as to extend upward and outward from the lower end of the valve stem. Bend upward and engage the tip with the lower surface of the protrusion 6d.
[0028]
As described above, the discharge valve body C and the suction valve body D are the same in shape and structure as shown in FIG. 3, but the suction valve body D is elastic because the elastic plate 31 must have flexibility. While the material is required to be deformable, the discharge valve body C is not required to be flexible, so the material does not necessarily need to be elastically deformable. Of course, different materials may be used.
[0029]
However, when different materials are used, two types of valve bodies, a discharge valve body and a suction valve body, are required, so that the corresponding types of molds are required and the parts management is complicated. I have to be. Therefore, it is preferable that the discharge valve body C is made of an elastically deformable material similar to the suction valve body D, and the both materials are the same.
[0030]
Thus, when both materials are made the same, it is preferable to use a synthetic resin material also in the discharge valve body C from the place where a synthetic resin material is preferable among the materials having elasticity as the material of the suction valve body D. . Thus, in the case of using a synthetic resin material as both materials, it is freed from difficult separation and disposal, which is desirable from the viewpoint of recycling.
[0031]
From this viewpoint, it is preferable that each of the cylinder A, the operation member B, the discharge valve body C, the suction valve body D, and the coil spring 18 is formed of a synthetic resin material.
[0032]
Next, the operation of this embodiment will be described.
In order to eject the liquid from the unused state shown in FIG. 1, the push-down head 19 with nozzle is rotated to release the screwing of the female screw 13 and the male screw 22. The rise is caused by the urging force, and the rise stops when the connecting portion between the cylindrical piston 14 and the stem 15 comes into contact with the tapered cylindrical portion at the lower end portion of the fitting cylinder 12.
[0033]
When the operating member B is pushed down against the urging force of the coil spring 18 from this state, the liquid in the cylinder A is increased in pressure, whereby the valve plate 30 of the suction valve body D is firmly pressed against the tapered suction valve seat 6c. At the same time, the discharge valve body C rises while sliding the tip of the engagement plate 28 with respect to the inner surface of the stem, and the valve plate 27 is separated from the tapered discharge valve seat 16, whereby liquid is ejected from the nozzle 23. The raising of the discharge valve body C stops when the engagement plate 28 is engaged with the lower surface of the tapered discharge valve seat 16.
[0034]
Thus, when the operating member B reaches the lower limit position, the ejection of liquid stops, and thereafter, the operating member B starts to rise due to the urging force of the coil spring 18, and at the same time, the negative pressure in the cylinder A starts. Then, the discharge valve body C starts to descend from its upper limit position, but the lowering is not as rapid as in the prior art because the tip of the engagement plate 28 slides downward on the inner surface of the stem. It takes a certain time from the start of the negative pressure to sit on the tapered discharge valve seat 16 and close the valve seat, and the tapered discharge valve seat almost simultaneously with the start of the negative pressure in the cylinder as in the conventional example. Since the nozzle 16 is not closed, the nozzle 23 and the negative pressure inside the cylinder A are in communication with each other until the tapered discharge valve seat 16 is closed.
[0035]
Therefore, immediately after the start of the negative pressure, the negative pressure inside the cylinder does not reach a height enough to separate the suction valve body D from the tapered suction valve seat 6c, and therefore the suction valve body D is in a closed state. On the other hand, so-called back suction occurs in which the liquid remaining in the nozzle 23 is absorbed into the cylinder. This prevents so-called dripping of the liquid remaining in the nozzle after the liquid is ejected.
[0036]
When the discharge valve body C is further lowered to close the tapered discharge valve seat 16 and the communication between the inside of the cylinder A and the nozzle 23 is blocked, the inside of the cylinder becomes a higher negative pressure, so the elastic plate of the suction valve body D 31 is elastically deformed and bends upward with its tip as a fulcrum, whereby the valve plate 30 is displaced upward and separated from the tapered suction valve seat 6c, and the liquid in the container is sucked into the cylinder A.
[0037]
Further, when the actuating member B rises and reaches the upper limit position, the negative pressure in the cylinder A is eliminated, so that the elastic plate 31 is restored to its original shape by its elastic deformation resistance, and the valve plate 30 is displaced downward together with this. Then, the tapered suction valve seat 6c is automatically closed.
[0038]
【The invention's effect】
According to the first aspect of the present invention, the valve plate of the discharge valve body is placed on the tapered discharge valve seat, the engagement plate is engaged with the inner surface of the upper portion of the stem, and the valve plate of the suction valve is further tapered. Since the elastic plate is engaged with the lower surface of the engagement protrusion on the inner surface of the holding cylinder, the discharge valve body is seated on the tapered discharge valve seat almost simultaneously with the start of negative pressure in the cylinder as in the prior art. Therefore, the nozzle and the inside of the cylinder are in communication with each other immediately after the start of the negative pressure, and therefore the negative pressure inside the cylinder is in the initial stage of the negative pressure start. The state is not sufficient to separate the suction valve body from the tapered suction valve seat, so that the suction valve body remains closed, while the nozzle communicates with the inside of the cylinder that has been negatively pressured by this delay time. And therefore the nozzle Residual liquid is aspirated liquid sagging can be prevented to the internal cylinder.
[0039]
In addition, when the negative pressure inside the cylinder is eliminated, the suction valve body is automatically seated on the tapered suction valve seat by the elastic deformation resistance force of the elastic piece itself without borrowing the biasing force of other members such as springs. Therefore, the number of members can be reduced.
[0040]
In the invention of claim 2, since both the discharge valve body and the suction valve body are integrally formed of a synthetic resin material, the synthetic resin member and the metal member do not coexist as in the prior art. This makes it possible to eliminate difficult separation and disposal, which is desirable from the viewpoint of recycling.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state of a liquid dispensing pump according to the present invention when not in use.
FIG. 2 is a perspective view of an open / close cylinder for opening / closing a nozzle.
FIG. 3 is a perspective view of a valve body that similarly forms a discharge valve and a suction valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Installation cylinder 2 Neck part 3 Outward flange 4 Inward flange 6a Holding cylinder 6c Tapered suction valve seat 6d Projection (engagement projection)
11 Cylinder upper end 14 Tubular piston 15 Stem 16 Tapered discharge valve seat 19 Depressing head with nozzle 26 Valve rod 27 Valve plate 28 Engaging plate 28a Discharge valve 29 Valve rod 30 Valve plate 31 Elastic plate 31a Suction valve A Cylinder B Actuating member C Discharge valve body D Suction valve body

Claims (2)

A cylinder A that is suspended by engaging an outward flange 3 attached to the upper part with the lower surface of the inward flange 4 at the upper end of the mounting cylinder 1 fitted to the outer surface of the container body neck portion 2;
An actuating member B having a cylindrical piston 14 at the lower end of the stem 15 and fitted with a pressing head 19 with a nozzle 23 on the upper outer surface of the stem 15; ,
A discharge valve 28a is formed by placing the upper lower outer surface of the valve plate 27 that is expanded upward and outward from the upper end of the valve rod 26 on the lower small diameter tapered discharge valve seat 16 attached to the upper inner surface of the stem 15. And a discharge valve body C in which tips of a plurality of engagement plates 28 projecting radially outward from the lower end of the valve stem are engaged with the upper inner surface of the stem 15;
A holding cylinder 6a is erected from the cylinder peripheral wall below the sliding portion of the cylindrical piston 14 via an inward flange, and a lower small diameter tapered suction valve seat 6c is attached to the inner surface of the holding cylinder. An upper lower outer surface of the valve plate 30 that is expanded upward and outward from the upper end of the valve rod 29 is placed on the tapered suction valve seat to form a suction valve 31a, and from the lower end of the valve rod 29 upward and outward. And a suction valve body D having a plurality of radially extending elastic plate 31 tips engaged with the lower surface of the engaging projection 6d formed on the inner surface of the holding cylinder 6a. pump. 2. The liquid dispensing pump according to claim 1, wherein the discharge valve body C and the suction valve body D are integrally formed of a synthetic resin material.

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