JPH092511A - Liquid pouring pump - Google Patents

Abstract

PURPOSE: To provide a push-down head type pump which does not allow liquid to push open a discharge valve and leak even in the case where the internal pressure of a container increases, by constructing the pump so as to effect the pressure contact seal of the discharge valve by means of an elastic plate, and a seal of an external air-introducing through-hole by an annular piston. CONSTITUTION: A push-down head type liquid pouring pump is so constructed that, in a state that an actuating member 4 is lifted highest, a locking protruding line 23 provided peripherally at a lower part of an inner face of a stem 19 is closely locked to an underface of a locking protruding line 33 provided peripherally on an outer periphery of an upper part of a suction valve body 31, and that an upper edge of an annular piston 18 blocks up an opening of a gap between a threaded cylindrical part 15 fitted in an inner portion of the upper end of a cylinder 2 and an inner face of the cylinder to close an external air introducing through-hole 10 communicating to the gap.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a liquid dispensing pump.

[0002]

2. Description of the Related Art As a liquid pouring pump, a push-down head type pump as shown in FIG. 3 is known. This pump 1A has a cylinder 50 that hangs inside a container body 12 fixed by a mounting cap 51 that is screwed onto the outer circumference of the neck portion 13 of the container body, and an annular piston that is vertically slidably fitted in the cylinder. An operating member 56, to which a push-down head 55 with a nozzle 54 is fixed, is provided on the upper end of a stem 53 provided with 52 projecting from the outer periphery of the lower end, and this operating member is constantly urged upward by a coil spring 57. The coil spring is stretched between the upper surface of the locking plate portion 58 projecting circumferentially in the lower part of the cylinder and the lower surface of the operating member.

Further, a screw cylinder portion 59 fitted to the inner surface of the upper end portion of the cylinder is constructed so that the actuating member can be screwed in a depressed state. The screw tube portion 59 covers the through hole 60 for introducing the outside air, which is bored in the upper part of the cylinder, with a gap between the through hole and the cylinder so that the cylinder can communicate with the outside hole and the lower end edge is opened.

Further, a suction valve body 62 for opening and closing a valve seat 61 provided at the lower end of the cylinder is provided to form a suction valve 63. The suction valve body 62 is in the form of a vertically long rod in which a locking projection 64 that vertically moves between the locking plate portions 58 is provided from the outer periphery of the lower portion. A valve seat 65 is provided on the upper part of the stem 53, and a discharge valve body 66, which comes into pressure contact with the valve seat, is integrally provided via an elastic plate 67 to form a discharge valve 68.

[0005]

When the container equipped with the above-mentioned pump is accidentally tilted when the operation member 56 is released from the depressed and locked state, the liquid in the cylinder 50 is discharged from the discharge valve.
68 is an excellent one that can prevent leakage to the outside, and the liquid inside the container can be prevented from leaking to the outside by the annular piston 52.

However, since the inside of the container is hermetically closed by the seal by the piston and the seal by the discharge valve, when the pressure in the container rises due to a rise in the outside air temperature, the liquid pushes the discharge valve to the outside. The inconvenience of leakage sometimes occurred. To solve this problem, if the elastic force of the elastic plate that presses the discharge valve body is made extremely large, it can be solved, but on the other hand, the opening degree of the valve at the time of liquid pouring becomes worse. . Therefore, the present invention proposes a pump capable of preventing the liquid from leaking from the discharge valve even if the pressure in the container body rises.

Further, in order to obtain such an effect, it is desired that each seal portion has a good sealing property, but in the present invention, the stem has a special structure to maintain the strength of the stem. While obtaining good sealing property of each part,
As a result, an excellent liquid pouring pump capable of exerting the above effects is proposed.

[0008]

In order to solve the above problems, the pump according to the first aspect of the present invention is provided with a valve seat 6 at the lower end opening which hangs down into the container body, and the inner peripheral lower end above the valve seat. A cylinder 2 having a plurality of circumferentially projecting locking plate portions 11 projecting therefrom and a through hole 10 for introducing outside air formed in the upper portion thereof, and a peripheral wall 14 fitted to the outer circumference of the container neck 13 Along with
Mounting cap 3 for fixing the upper part of the cylinder to the container body
And a screw cylinder portion 15 which is fitted to the inner surface of the cylinder upper end and covers the through hole by opening the lower end edge to allow communication between the through hole and the inside of the cylinder, and fitted to the inner surface of the cylinder. A push-down head with a nozzle 20 at the upper end of a stem 19 provided with an annular piston 18 projecting from the outer periphery of the lower part and being vertically movable.
21 is fixed, and a discharge valve body 25, which is pressed against a valve seat 22 provided in the upper part of the inside of the stem, is integrally projected through a plurality of elastic plates 24 protruding from the inner surface of the stem. The configured discharge valve 26, the coil spring 30 interposed between the lower surface of the operating member and the upper surface of each locking plate portion to constantly urge the operating member upward, and the vertical movement between the locking plate portions. A plurality of locking projections 32 are formed in the shape of a vertically long rod projecting from the lower outer periphery, and the upper surface of each locking projection is abutted and locked to the lower surface of the coil spring from the state where the lower surface is in close contact with the valve seat 6. Between the suction valve body 31 and the suction valve body 31 which can be moved up and down.A locking projection 23 is provided around the lower part of the inner surface of the stem when the actuating member is at the highest position. It is closely locked to the lower surface of the locking projection 33, and the upper edge of the annular piston is raised. Configured as a liquid dispensing pump, characterized in that the as configured to close the gap opening between the threaded cylindrical portion and the inner surface of the cylinder.

Further, in the pump of the second aspect of the invention, the stem 19 has a double laminated structure of the inner cylinder 19a and the outer cylinder 19b, and the upper end of the inner cylinder is positioned below the upper end of the outer cylinder. 2. The liquid according to claim 1, which is formed on the valve seat 22, and wherein the locking projection 23 is integrally projected from the inner cylinder lower part of the inner cylinder, and the annular piston 18 is integrally projected from the outer cylinder outer peripheral lower part. Configured as a pouring pump.

[0010]

When the operating member 4 is pushed up to the highest position by the coil spring 30, the locking projection 23 of the stem 19 is closely locked to the lower surface of the locking projection 33 of the suction valve body 31, and
The discharge valve body 25 is pressed against the valve seat 22 by each elastic plate 24,
Due to the double-sealed state, even if the internal pressure of the mounted container rises due to a rise in outside air temperature or the like, leakage of the liquid by opening the discharge valve 26 is prevented.

At the same time, the upper end of the annular piston 18 closes the lower end opening of the gap between the lower end of the screw cylinder 15 and the inner surface of the cylinder to prevent the liquid in the container body from leaking out from the through hole 10 for introducing the outside air due to the rise of the internal pressure. To do.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention.
The liquid pouring pump 1 of the present invention comprises a cylinder 2, a mounting cap 3, and an operating member 4 as main members.

The cylinder 2 has a cylindrical shape, and extends from an inner peripheral edge of the bottom wall 5 having an inward flange shape, and extends a tapered valve seat 6 for the suction valve. A fitting cylinder portion 7 is vertically provided from the lower surface of the portion. This fitting cylinder 7
The upper end of the suction pipe 8 is fitted and fixed to the. In addition, the upper end of the peripheral wall 9 is expanded in diameter, a through hole 10 for introducing outside air is formed in the lower end of the expanded part, and a plurality of circumferential locking plate parts 11 are projected at the lower end of the inner peripheral part of the peripheral wall 9. I have set up.

The mounting cap 3 is for mounting the peripheral wall 14 on the outer periphery of the mouth / neck portion 13 of the container body 12 to mount it on the container body and for fixing the upper portion of the cylinder 2 to the container body.
In this embodiment, the screw cylinder portion 15 for screwing and locking the operating member 4 in the depressed state is integrally formed. Threaded portion 15
Is fitted to the upper end of the inner surface of the cylinder 2, and covers the through hole 10 by opening the lower end edge so that the through hole 10 can communicate with the inside of the cylinder.

In this embodiment, the mounting cap 3 is a peripheral wall.
14 Extend inward flange-shaped top wall 16 from the top edge,
16 A threaded cylinder portion 15 is vertically provided from the inner peripheral edge portion. The inner half of the top wall 16 is raised, and the inner surface of the vertical wall portion of the raised portion is engaged with the outer circumference of the enlarged diameter portion of the cylinder through the concave-convex engagement means, and the outer surface of the screw cylinder portion 15 is set to the above-mentioned. It is fitted to the inner surface of the expanded diameter portion and fixed to the cylinder, and further, the inner surface of the peripheral wall 14 is fitted to the outer periphery of the container neck portion 13 by means of uneven engagement or the like. Reference numeral 17 in the figure denotes a seal cylinder portion which is fitted in a liquid-tight manner on the inner circumference of the neck of the container body.

Further, the threaded cylinder portion 15 is provided with a thread around the inner surface of the upper half portion, and the lower half portion is formed in a double cylinder shape having a short outer side, and the outer cylinder outer surface and the upper half outer surface are formed in the cylinder 2. Is liquid-tightly fitted to the inner surface of the enlarged diameter portion, and the inner cylinder is hung down to the small diameter portion of the peripheral wall 9 below the enlarged diameter portion, and the through hole 10 and the inside of the cylinder 2 communicate with each other with a clearance from the cylinder peripheral wall 9. It is configured to do. Therefore, when the upper part of the container becomes negative pressure due to the pouring of the liquid, the outside air is introduced from this gap through the through hole 10.

The actuating member 4 has a stem 19 in which an annular piston 18 fitted to the inner surface of the peripheral wall of the cylinder 2 so as to be vertically slidable is provided so as to project from the outer periphery of the lower end so as to be vertically movable, and at the upper end of the stem 19. A fixed push-down head 21 with a nozzle 20 is projected above the mounting cap 3 so as to be vertically movable.

The piston 18 is provided with an upward skirt-shaped portion and a downward skirt-shaped portion projecting above and below a vertical annular substrate, and the outer peripheral edge of each skirt-shaped portion is pressed against the inner surface of the cylinder in a liquid-tight manner so as to be slidable. There is. The stem 19 has a double layered structure of an inner cylinder 19a and an outer cylinder 19b, and the upper end of the inner cylinder 19a is located below the upper end of the outer cylinder 19b so that its upper surface is a valve seat.
22. The locking projection 23 is integrally formed around the lower part of the inner circumference of the inner cylinder 19a, and the annular piston 18 is integrally projected from the lower part of the outer circumference of the outer cylinder 19b.

Further, a plurality of elastic plates 24 each having a rod shape that obliquely descends from the inner surface of the outer cylinder 19b protruding upward from the inner cylinder 19a are provided so as to project in the circumferential direction, and the lower end of each elastic plate 24 is integrated with the upper surface of the discharge valve body 25. And the peripheral edge of the lower surface of the discharge valve body 25 is connected to the valve seat 22.
The discharge valve 26 is formed so as to be pressed against the top.

Further, in the push-down head 21, a vertical cylinder 27 having a lower inner surface fitted and fixed to the outer peripheral upper end portion of the stem 19 is vertically hung from the central portion of the rear surface of the top wall 28, and from the peripheral portion of the top wall peripheral wall.
Further, the nozzle 20 is made to hang down, and the nozzle 20 having the base end opened on the front surface of the upper end of the vertical cylinder 27 penetrates the front part of the peripheral wall 29 and is projected forward. Further, a screw thread is provided around the lower portion of the vertical cylinder 27 so that the operating member 4 can be engaged with the above thread of the threaded cylinder portion 15 when the actuating member 4 is pushed down, and locked in the pushed down state. ing.

The actuating member 4 as described above is interposed between the lower surface of the actuating member 4 and the upper surface of each locking plate portion 11, and is constantly urged upward by the coil spring 30. The actuating member is pushed up to the highest position. The upper end edge of the annular piston 18 of No. 4 is configured so as to liquid-tightly close the gap opening between the screw cylinder portion 15 and the inner surface of the cylinder 2.

A suction valve body 31 is provided on the valve seat 6 in the cylinder. The suction valve body 31 has a vertically elongated rod shape in which a plurality of locking projections 32 that move vertically between the locking plate portions 11 are projected from the lower outer periphery, and locking projections 33 are circumferentially provided on the upper outer circumference, The valve seat 6 and the suction valve 34 are constituted. Further, it is provided so as to be vertically movable from a state in which the lower surface is in close contact with the valve seat 6 to a state in which the upper surface of each locking projection 32 is brought into contact with and locked to the lower surface of the coil spring 30. Further, at the highest position of the operating member 4, the locking projection 23 in the stem 19 is configured to be closely locked to the lower surface of the locking projection 33.

In the suction valve body 31 in this embodiment, the lower half portion has a hollow large diameter and the upper half portion has a solid small diameter, and a plurality of locking projections 32 in the circumferential direction are provided on the lower outer surface of the large diameter portion. Is projected. Further, a large number of vertical ribs 35 are provided vertically on the outer periphery of the upper half portion.

Further, by pushing down the operating member 4, the head vertical cylinder
When the 27 threads are screwed into the threads of the threaded cylinder 15,
19 The inner surface of the lower end is configured to be liquid-tightly fitted to the outer circumference of the upper end of the large diameter portion of the suction valve element 31. At this time, the vertical cylinder 27
The outer periphery of the lower end is configured to fit into the lower part of the screw cylinder in a liquid-tight manner. Therefore, when the operating member 4 is pushed down and locked when it is not in use, such as during distribution, it is configured so as to prevent leakage of liquid by sealing at the above-mentioned two places.

In the pump 1 constructed as described above, the suction valve 34 is pushed by pushing the head 21 and pushing down the operating member 4.
When is closed, the seal between the suction valve body 31 and the locking projections 33 and 23 of the stem 19 is released, the inside of the cylinder is pressurized, the discharge valve 26 is opened, and the liquid is poured out from the tip of the nozzle 20. Further, when the operating member 4 is raised, the inside of the cylinder 2 becomes negative pressure, the discharge valve 26 is closed, the suction valve 34 is opened, and the container body 12 is opened.
The liquid inside is introduced into the cylinder. The suction valve 34 closes along the flow of the liquid that slightly flows backward from the inside of the cylinder into the fitting cylindrical portion 7 due to the lowering of the operating member 4.
It should be noted that each of the above-mentioned members is mainly formed of a synthetic resin, and is formed by appropriately selecting and using an elastomer, a metal or the like as necessary.

[0026]

As described above, in the pump of the present invention, when the actuating member is in the highest position, the locking projections provided around the lower part of the inner surface of the stem are sucked in and the lower surfaces of the engagement projections provided around the upper outer circumference of the suction valve body. The discharge valve body is pressed against the valve seat provided on the upper part inside the stem through a plurality of elastic plates, so that the pressure inside the container in which the pump is mounted is increased due to the rise of the outside air temperature. Even if it rises, the discharge valve can be opened to prevent the stored liquid from leaking.

Moreover, as in the conventional case, even if the container is accidentally tilted in a state where the operating member is raised, the liquid leakage can be prevented by the seal of the discharge valve and the upper edge portion of the annular piston.

In the pump of the second aspect of the present invention, the stem has the double-layered structure having the above-mentioned structure. Therefore, even if a relatively flexible material is selected as the material of each of the inner and outer cylinders forming the stem, While maintaining the required rigidity,
The discharge valve provided in the inner cylinder, the locking projection for sealing, and the annular piston provided in the outer cylinder can more effectively exhibit the sealing property.

[Brief description of drawings]

FIG. 1 is a half sectional view showing one embodiment of the present invention.

FIG. 2 is a half sectional view of the working member of the embodiment in a state of being pushed down and locked.

FIG. 3 is a half sectional view showing an example of a conventional container.

[Explanation of symbols]

2 ... Cylinder, 3 ... Mounting cap, 4 ... Actuating member, 6 ...
Valve seat, 10 ... through hole, 11 ... locking plate part, 13 ... mouth neck part, 14 ... mounting cap peripheral wall, 15 ... screw cylinder part, 18 ... annular piston, 19 ... stem, 19a ... inner cylinder, 19b ... outer cylinder , 20 ... Nozzle, 21 ... Depressing head, 22 ... Valve seat, 23 ... Locking ridge, 24 ... Elastic plate, 25
… Discharge valve body, 26… Discharge valve, 30… Coil spring, 31…
Suction valve body, 32 ... Locking protrusion, 33 ... Locking protrusion

Claims (2)

[Claims] 1. A valve seat 6 is provided at a lower end opening that hangs down into the container body.
And a container 2 in which a plurality of circumferentially engaging plate portions 11 are provided at the lower end of the inner periphery above the valve seat, and through holes 10 for introducing outside air are formed at the upper portion, and a container. The peripheral wall 14 is fitted and mounted on the outer circumference of the body opening / neck portion 13, and the mounting cap 3 for fixing the cylinder upper part to the container body is fitted to the inner surface of the cylinder upper end, and the communication between the through hole and the cylinder is performed. A threaded cylindrical portion 15 which opens the lower end edge so as to cover the through hole, and an annular piston 18 fitted to the inner surface of the cylinder, which projects from the outer periphery of the lower portion and is provided at the upper end of the stem 19 which is vertically movable. An operating member 4 to which a push-down head 21 with a nozzle 20 is fixed, and a discharge valve body 25, which comes into pressure contact with a valve seat 22 provided on the inner upper part of the stem, are integrated through a plurality of elastic plates 24 protruding from the inner surface of the stem. A discharge valve 26 formed by projecting on the
A coil spring that intervenes between the lower surface of the operating member and the upper surface of each of the locking plate portions to constantly urge the operating member upward.
30 and a plurality of locking protrusions 32 that move up and down between the locking plate portions
Has a vertically long rod shape protruding from the lower part of the outer periphery, and can be moved up and down from the state where the lower surface is in close contact with the valve seat 6 to the state where the upper surface of each locking projection is abutted and locked to the lower surface of the coil spring. And a locking projection 23 provided around the lower part of the inner surface of the stem when the actuating member is in the most raised state.
33. A liquid pouring pump characterized in that it is closely locked to the lower surface of the annular piston and that the upper end edge of the annular piston closes the gap opening between the screw cylinder portion and the inner surface of the cylinder. 2. The stem 19 has a double-layered structure of an inner cylinder 19a and an outer cylinder 19b, the upper end of the inner cylinder is located below the upper end of the outer cylinder, and the upper surface thereof is formed on the valve seat 22. The liquid pouring pump according to claim 1, wherein the locking projections (23) are integrally projected from the lower portion of the inner circumference of the cylinder, and the annular piston (18) is integrally projected from the lower outer circumference of the outer cylinder.