JPH10236507A - Liquid-pouring pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make liquid remaining in a nozzle drawn by suction into the inside of a cylinder by a method wherein a suction valve body is separated from a tapered suction valve seat approximately at the same time with starting of negative pressurization at the inside of the cylinder while a delivery valve body is seated, being delayed slightly after starting of rise of a push-down head, and a nozzle is made to communicate with the negatively pressurized inside of the cylinder during a period corresponding to the delay in seating of the delivery valve body. SOLUTION: A delivery valve body wherein the lower external face at the upside of a valve plate 27 expanding from the upper end to the upper outside of a valve stem 26 is mounted on a tapered delivery valve seat 16 and tips of a plurality of engaging plates 28 expanding radially in projection from the lower end to the upper outside of the valve stem 26 are engaged with the upper internal face of a stem 15 and a suction valve body D wherein the lower external face at the upside of a valve plate 30 expanding from the upper end to the upper outside of a valve stem 29 is mounted on a tapered suction valve seat 6c and tips of a plurality of elastic plates 31 expanding radially in projection from the lower end to the upper outside of the valve stem 29 are engaged with the underside of engaging projections 6d formed at the internal face of a holding tube 6a are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid dispensing pump.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. 8-268458 discloses a mounting cap fitted to the mouth and neck of a container body, and a suction valve formed in a lower end portion which is fixed to the container body by the cap and hangs down into the container body. A cylinder provided with a ball valve, an auxiliary spring for constantly biasing the ball valve in the valve closing direction, and a stem provided with an annular piston fitted in the cylinder so as to protrude from the lower part of the outer periphery and to be vertically movable. A press-down head with a nozzle fitted to the upper end of the stem, a ball valve forming a discharge valve provided in an upper portion of the inside of the stem, and a coil spring for urging the stem upward. The liquid in the cylinder is ejected from the nozzle via the discharge valve by pushing down, and the liquid in the container is sucked up into the cylinder via the suction valve by raising the pushing head with the nozzle. Unishi was liquid dispensing pump is disclosed.

[0003]

In the above-mentioned prior art, when the press-down head with the nozzle is depressed, the pressure in the cylinder is increased, whereby the ball valve is pushed upward, whereby the discharge valve is opened and the liquid in the cylinder is ejected. I do. After the ejection, the press-down head with nozzle starts to rise due to the urging force of the coil spring, but the rise of the press-down head causes a negative pressure in the cylinder, which opens the suction valve and the ball valve forming the discharge valve. Since the discharge valve closes almost immediately when the press-down head with the nozzle starts to rise and closes the discharge valve almost immediately, 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.

Further, in the above-described conventional example, the suction valve requires an auxiliary spring for biasing the suction valve in the seating direction in addition to the ball valve mounted on the suction valve seat. It had to be expensive.

[0005] Further, in the above-mentioned conventional example, a ball valve is used as a valve body forming the discharge valve and the suction valve as described above. Usually, a metal is used as a material of the ball valve, and on the other hand, other members are used. Is made of a synthetic resin material, but it is difficult to separate the metal material and the synthetic resin material from the viewpoint of recycling, though it is desired to separate them.

According to the first aspect of the present invention, the valve plate of the discharge valve body is mounted 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 provided. Is mounted on the tapered suction valve seat, and the elastic plate is engaged with the lower surface of the engaging projection on the inner surface of the holding cylinder. Without sitting on the tapered discharge valve seat,
The nozzle is communicated with the inside of the cylinder even after negative pressure by seating a little later, and the negative pressure degree is slightly reduced by this, so that the suction valve body is separated from the tapered suction valve seat into negative pressure. At the same time, the residual liquid is sucked into the cylinder from the nozzle within this delay time to prevent liquid dripping, and when the negative pressure in the cylinder is eliminated, the suction valve has its own elasticity. By utilizing the elastic deformation resistance of the plate, the seat is automatically seated on the tapered suction valve seat without using other members such as springs, thereby reducing the number of members.

A liquid injection pump according to a second aspect of the present invention has a solution problem of the liquid injection pump according to the first aspect. In addition, the discharge valve body and the suction valve body are integrally formed of a synthetic resin material. The aim is to eliminate difficult sorting waste.

[0008]

As a first means, an outward flange 3 attached to an upper portion is engaged with a lower surface of an inward flange 4 at an upper end of a mounting cylinder 1 to be fitted to an outer surface of a mouth and neck portion 2 of a container body. A cylindrical piston 14 is provided at a lower end of a stem 15 and a press-down head 19 with a nozzle 23 is fitted to an upper outer surface of the stem 15. The upper and lower outer surfaces of the valve plate 27, which is expanded upward and outward from the upper end of the valve rod 26, are mounted on the operating member B attached and the lower small diameter tapered discharge valve seat 16 attached to the upper inner surface of the stem 15. A discharge valve body C in which a plurality of engaging plates 28 protruding radially from the lower end of the valve rod and projecting radially outward from the lower end of the valve rod are engaged with the upper inner surface of the stem 15, The cylinder below the sliding portion of the cylindrical piston 14 The holding cylinder 6a is erected from the wall via an inward flange, and a lower small-diameter tapered suction valve seat 6c is attached to an upper inner surface of the holding cylinder, and the tapered suction valve seat is placed on the tapered suction valve seat from the upper end of the valve rod 29. The suction valve 31a is formed by placing the upper and lower outer surfaces of the valve plate 30 expanded upward and outward, and the ends of the plurality of elastic plates 31 projecting radially upward and outward from the lower end of the valve rod 29 are removed. And a suction valve element D engaged with the lower surface of an engaging projection 6d formed on the inner surface of the holding cylinder 6a.

As a second means, the above-described first means is provided, and the discharge valve element C and the suction valve element D are integrally formed of a synthetic resin material.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a state where a liquid discharge pump according to the present invention is not used, FIG. 2 is a perspective view of an opening / closing 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 mainly includes a cylinder A, an operating member B, a discharge valve element C, and a suction valve element D. Hereinafter, these will be sequentially described.

In FIG. 1, reference numeral 1 denotes a mounting cylinder fitted to the outer surface of the container body neck and neck 2. A is a cylinder, cylinder A
Engages 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 hangs down into the container body, and the cylinder A communicates with the upper portion thereof into the container body neck portion 2. It has an outside air introduction hole 5 to be formed.

Further, the cylinder A has an inward flange at a lower end thereof, and a penetrating cylinder 6 is provided at an inner end of the inward flange. The penetrating cylinder 6 has a part of the penetrating cylinder above the inward flange serving as a holding cylinder 6a for holding a suction valve body D described later, and a part of the penetrating cylinder below the inward flange. Functions as a pipe fitting cylinder 6b for fitting a suction pipe.

The holding cylinder 6a has a cylindrical piston 14 to be described later.
And a tapered suction valve seat 6c having a small diameter at the lower portion on the inner surface at the upper end thereof and a ridge 6d extending vertically on the inner peripheral surface thereof at a predetermined interval in the circumferential direction. Are installed vertically. The ridge 6d is for engaging an elastic plate 31 of the suction valve body D, which will be described later. Therefore, the ridge 6d is not limited to the ridge but may be a wider inner wall. The number may be the same as 31.

In the present embodiment, as the means for engaging the elastic plate 31, a ridge 6d or an inner wall spaced in the circumferential direction is employed. In such a case, the suction valve is engaged with the ridge or the lower surface of the inner wall. Since it becomes necessary to rotate the body D in the circumferential direction to position the elastic plate 31, it is more preferable to use an annular inner wall extending over the entire circumference in the circumferential direction.

Further, the cylinder A has a plurality of ribs 7 extending vertically extending on the inner peripheral surface at the lower end thereof at predetermined intervals in the circumferential direction. The rib 7, together with the holding cylinder 6a, sandwiches a lower portion of a coil spring 18 described below, which is located between the two, so that it can expand and contract.

Reference numeral 8 denotes a member with a threaded member.
Is composed of a double cylinder of an inner cylinder 10 and an outer cylinder that hang down from the lower surface of the flange-shaped top plate 9. The fitting tube 12 hanging from the inner surface of the lower end of the inner tube 10 is fitted to the inner surface of the cylinder A so as to be unable to be pulled out to the upper end of the cylinder.

The inner cylinder 10 has a female screw 13 formed on the inner surface of the upper end, and the lower end of the fitting cylinder 12 is formed as a tapered cylindrical part having a lower small diameter. The connecting portion between the piston 14 and the stem 15 can be freely contacted.

Reference numeral B denotes an operating member which is fitted into the cylinder A by being urged upward, and has a cylindrical piston 14
And a press-down head 19 with a nozzle is fitted to the upper outer surface of the stem 15. The outer peripheral edges of the upper and lower end surfaces of the cylindrical piston 14 are fitted to the inner surface of the cylinder A in an airtight and vertically movable manner. An inward flange projects from the inner peripheral surface of the cylindrical piston 14, and a stem 15 projects 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 thereof, and has a small outer diameter portion 17 on the outer surface of the upper end portion thereof for fitting a press-down head 19 with a nozzle described later.

The upper end of a coil spring 18 is engaged with the lower surface of the inward cylinder, which forms the connection between the stem 15 and the cylindrical piston 14, to urge the cylindrical piston 14 upward. As described above, the cylindrical piston 14 slides vertically within the cylinder A, and the upper limit position of the sliding portion in the cylinder is the tapered cylindrical portion at the lower end of the fitting cylinder 12 where the cylindrical piston 14 contacts. The lower end is set at the lower end and the lower end is set at the upper end of the rib 7.

The pressing head 19 with a nozzle is provided with a peripheral wall 20.
And a hanging tube 21 hanging down from the upper end of the peripheral wall via an inward flange. The hanging tube 21 has a screw tube hanging from a lower end via a flange-like bottom wall. On the outer surface of the screw cylinder, a male screw 22 which can be screwed to the female screw 13 is formed, and the inner surface is fitted to the outer surface of the small outer diameter portion 17 of the stem 15.

A discharge hole 24 for connecting the base of the nozzle 23 is formed on the peripheral surface of the hanging cylinder 21. Further, an opening / closing cylinder 25 for opening and closing the nozzle shown in FIG.
Are rotatably fitted. The opening / closing cylinder 25 having an open lower surface has an inverted U-shaped opening on the peripheral surface, and the discharge hole 24 is opened / closed by the rotation position of the opening / closing cylinder 25. Further, the opening / closing cylinder 25 has an upper surface closed by a top wall, and has a knob on the top wall for rotating the opening / closing cylinder 25.

C is a discharge valve body, and FIG. 3 shows a state before assembly to the stem 15. As shown in FIG.
Has a valve plate 27 that expands upward and outward from the upper end of the valve stem 26 and a plurality of engaging plates 28 that radially expand and project outward from the lower end of the valve stem 26 before assembly. .

When assembling the discharge valve body C to the stem 15, the engagement plate 28 is bent upward from its base so that its tip is slidably abutted against the inner surface of the upper end of the stem. The upper and lower outer surfaces 27 are placed on the tapered discharge valve seat 16 to form a discharge valve 28a. Further, when the discharge valve body C rises when the pressure in the cylinder A is increased, the engagement plate 28 is tapered. The upper limit of the discharge valve body C is determined by engaging the lower surface of the discharge valve C.

In the present embodiment, a taper cylinder having a small diameter at the lower portion is employed as the valve plate 27 for upward and outward expansion, and the engagement plate 28 is formed from the lower end of the valve stem to the lower outward as described above. It is not limited to the one that is extended and protruded, but may be one that is extended and protruded upward and outward from the lower end of the valve rod. In this case as well, when assembling to the stem 15, the engaging plate 28 is moved upward. It is bent and its tip is slidably brought into contact with the inner surface of the upper end of the stem.

Reference numeral D denotes a suction valve element, similar to the discharge valve element C, as shown in FIG. 3, before the valve body 30 is assembled to the holding cylinder 6a. , Valve stem 29
A plurality of elastic plates 3 projecting radially outward from the lower end.
And 1.

At the time of assembling the suction valve body D to the holding cylinder 6a, the elastic plate 31 is bent upward from its base to engage its tip with the lower surface of the ridge 6d, The outer surface is placed on the tapered suction valve seat 6c to form the suction valve 31a.

As described above, in this embodiment,
As the valve plate 30 for upward and outward expansion, a taper cylinder having a small diameter at the lower portion is employed, and the elastic plate 31 is not limited to the one that is protruded downward and outward from the lower end of the valve rod as described above. In this case, the elastic plate 31 may be bent upward and the tip thereof may be formed as a ridge in order to assemble the holding cylinder 6a. 6d.

As described above, the discharge valve body C and the suction valve body D have the same shape and structure as shown in FIG. 3, but the suction valve body D requires that the elastic plate 31 has flexibility. Therefore, it is required that the material be elastically deformable. On the other hand, since the discharge valve body C is not required to be flexible, the material is not necessarily required to be elastically deformable. Of course, the same one may be used, but different ones may be used.

However, when different materials are used, two types of valve elements, a discharge valve element and a suction valve element, are required. Management must be complicated. Therefore, it is preferable that the material of the discharge valve body C is also elastically deformable as in the case of the suction valve body D, and both materials are made the same.

In the case where the two materials are made the same as described above, the synthetic resin material is preferable among the materials having elasticity as the material of the suction valve body D. Therefore, the synthetic resin material is also used for the discharge valve body C. Is preferred. Thus, when the synthetic resin material is used as the material of both, it is free from difficult sorting and disposal which is desirable from the viewpoint of recycling.

From this viewpoint, it is preferable that each of the cylinder A, the operating member B, the discharge valve element C, the suction valve element D and the coil spring 18 be formed of a synthetic resin material.

Next, the operation of the present embodiment will be described. To eject the liquid from the unused state shown in FIG.
What is necessary is just to release the screwing of the female screw 13 and the male screw 22 by rotating the press-down head 19 with the nozzle, and then the operating member B rises by the urging force of the coil spring 18, and the rise is caused by the cylindrical piston 14. It stops when the connecting portion with the stem 15 comes into contact with the tapered tube portion at the lower end of the fitting tube 12.

When the operating member B is pushed down against the urging force of the coil spring 18 in this state, the pressure in the liquid in the cylinder A is increased, and as a result, the valve plate 30 of the suction valve body D
Is firmly pressed against the tapered suction valve seat 6c, and the discharge valve body C rises while sliding the tip of the engagement plate 28 against the inner surface of the stem, so that the valve plate 27 is separated from the tapered discharge valve seat 16. As a result, the liquid is ejected from the nozzle 23. This rise of the discharge valve body C stops when the engagement plate 28 engages with the lower surface of the tapered discharge valve seat 16.

When the operating member B reaches the lower limit position, the ejection of the liquid is stopped. 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 descending from its upper limit position, but the descending is not as quick as in the conventional example because the tip of the engaging plate 28 slides down the inner surface of the stem. It takes a certain time from the start of the negative pressure until the valve seats on the tapered discharge valve seat 16 and closes the valve seat, and the tapered discharge valve seat is 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 inside of the cylinder A under negative pressure are in communication with each other until the tapered discharge valve seat 16 is closed.

Therefore, immediately after the start of 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, so that the suction valve body D keeps the valve closed state while the nozzle 23
A so-called back suction occurs in which the liquid remaining inside the cylinder is absorbed into the cylinder. This prevents the liquid remaining in the nozzle from dripping from the nozzle after the liquid is ejected.

When the discharge valve body C further descends to close the tapered discharge valve seat 16 and the communication between the inside of the cylinder A and the nozzle 23 is cut off, the inside of the cylinder becomes higher in negative pressure.
The elastic plate 31 of the suction valve body D is elastically deformed and flexed 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 discharged into the cylinder A. Is sucked up.

Further, when the operating member B rises and reaches the upper limit position, the negative pressure in the cylinder A is released, so that the elastic plate 31 returns to its original shape by its elastic deformation resistance, and the valve plate 30 Is displaced downward and the tapered suction valve seat 6
c is automatically closed.

[0038]

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 mounted. The discharge valve body is tapered almost simultaneously with the start of negative pressure in the cylinder, as in the past, because the elastic plate is engaged with the lower surface of the engaging projection on the inner surface of the holding cylinder while being placed on the tapered suction valve seat. The nozzle and the inside of the cylinder are in communication with each other immediately after the start of the negative pressure because the seat is slightly delayed from the start of the negative pressure without sitting on the valve seat. The negative pressure inside the cylinder is not enough to separate the suction valve body from the tapered suction valve seat.Therefore, the suction valve body keeps the valve closed, while the nozzle is under negative pressure for this delay time. Communication with the inside of the cylinder , The liquid remaining in the nozzle aspirated liquid sagging can be prevented to the internal cylinder.

When the negative pressure in the cylinder is eliminated, the suction valve body automatically tapers with the elastic deformation resistance of the elastic piece of the suction valve body without using the urging force of another member such as a spring. Since the user sits on the seat, the number of members can be reduced.

According to the second aspect of the present invention, 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 mix as in the conventional case. Therefore, difficult sorting and disposal that is desirable from the viewpoint of recycling can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state when a liquid injection pump according to the present invention is not used.

FIG. 2 is a perspective view of an opening / closing cylinder for opening / closing a nozzle.

FIG. 3 is a perspective view of a valve body forming a discharge valve and a suction valve.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mounting cylinder 2 neck and neck 3 outward flange 4 inward flange 6 a holding cylinder 6 c tapered suction valve seat 6 d ridge (engagement ridge) 11 cylinder upper end 14 cylindrical piston 15 stem 16 tapered discharge valve seat 19 nozzle Push-down head 26 Valve stem 27 Valve plate 28 Engagement plate 28a Discharge valve 29 Valve stem 30 Valve plate 31 Elastic plate 31a Suction valve A Cylinder B Operating member C Discharge valve body D Suction valve body

Claims (2)

[Claims] 1. A mounting cylinder 1 fitted to the outer surface of a mouth and neck 2 of a container body.
A cylinder A that is suspended by engaging an outward flange 3 provided on an upper part with a lower surface of an inward flange 4 at an upper end, and a cylindrical piston is fitted to the lower end of a stem 15 by being urged upward into the cylinder A. An operating member B having a press-down head 19 with a nozzle 23 on the upper outer surface of the stem 15 and a lower small-diameter tapered discharge valve seat 16 provided on the upper inner surface of the stem 15; The discharge valve 28a is formed by placing the upper and lower outer surfaces of the valve plate 27 which is expanded upward and outward from the upper end of the valve rod 26, and a plurality of engaging members which are radially expanded and projected upward and outward from the lower end of the valve rod 26. The holding valve 6a is erected from the discharge valve element C having the tip of the plywood 28 engaged with the upper inner surface of the stem 15 and the cylinder peripheral wall below the sliding portion of the cylindrical piston 14 via an inward flange, A small-diameter tapered lower part is A suction valve seat 6c is provided, and an upper and lower outer surface of a valve plate 30 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. At the same time, a suction valve body D in which the tips of a plurality of elastic plates 31 radially expanding and projecting upward and outward from the lower end of the valve rod 29 are engaged with the lower surface of an engaging projection 6d formed on the inner surface of the holding cylinder 6a. And a liquid injection pump having: 2. The discharge valve body C and the suction valve body D are each integrally formed of a synthetic resin material.
Liquid dispensing pump as described.