JPH0511348Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention prevents liquid leakage from the gap created between the horizontal hole provided in the small diameter neck of the piston rod and the valve member that closes this horizontal hole. This invention relates to an upper valve of a spray pump.

[Conventional technology]

Usually, a spray pump has a structure as shown in FIGS. 1 and 2. That is, a lower valve 3 and an upper valve are installed inside a valve barrel 1 which is fixed to a screw cap 10 which is detachably attached to a container by means of a threaded part 10b. 2 to form a liquid chamber 4, and when the lower valve 3 is opened with the movement of the piston, the content liquid is stored in the liquid chamber 4 using the suction pipe 14, and when the upper valve 2 is opened, the contents of the liquid chamber 4 are stored. The substance is injected from the nozzle 5 of the injection button 15 which operates together with the piston rod 7.

The conventional upper valve 2 has a lower valve side liquid passage 18 in a small diameter neck portion 8 formed at the lower part of the piston rod 7.
A cylindrical valve member 6 having elasticity is attached thereto, and a horizontal hole 9 opening on the outer circumferential surface of the small-diameter neck portion 8 is sealed with an inner circumferential surface 6b of the valve member.

Therefore, by moving the piston rod 7 downward, the valve member 6 deforms along the upper shoulder 8a due to the pressure in the liquid chamber 4, thus opening the lateral hole 9 and discharging the contents to the lower valve side. It is configured so that it can be sent to the discharge port side liquid passage 7a of the piston rod 7 via the liquid passage 18 and the horizontal hole 9 for injection.

Moreover, 17 is an air hole for adjusting the pressure difference between the inside and outside of the container.

[The problem that the idea attempts to solve]

As shown in FIGS. 1 and 2, the above-mentioned upper valve 2 has a valve member 6 having an upper shoulder portion 8a and a lower shoulder portion 8b.
At the top dead center of the piston rod 7 (in the non-use mode of the spray pump), the outer shoulder 6a of the upper surface of the valve member 6 is supported by the push-up spring 11 provided on the piston rod 7. It comes into contact with the lower surface of the inner cylindrical portion 10a of the screw cap 10 by force. Therefore, due to this contact, communication between the inside of the container and the outside via the air hole 17 is cut off, and even if the container falls over, the container will not be stored inside the container. Contents will not leak outside.

However, in the valve member 6, the portion where the outer shoulder portion 6a and the lower surface of the inner cylinder portion 10a contact is the lower shoulder portion 8.
Since it is located outside of b, the biasing force of the push-up spring 11 creates a gap 12 in the portion above the horizontal hole between the small diameter neck portion 8 and the inner peripheral surface 6b, and this gap 12 The outlet side liquid passage 7a of the piston rod 7 is communicated with the outside through the center hole 13 of the screw cap 10, so if the container falls over, the residue in the outlet side liquid passage 7a can be removed to the outside. It has the problem of leakage.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an upper valve of a spray pump that ensures the sealing of the side hole by the valve member and prevents leakage of residue at the top dead center of the piston rod.

[Means to solve the problem]

The upper valve of the spray pump of the present invention is configured to close the gap created between the valve member and the small diameter neck. And at least one of the inner peripheral surface portions of the valve member corresponding to the portion is provided with a thick annular portion for closing the gap.

[Effect]

In the upper valve configured as described above, the thick annular portion elastically contacts the valve member at the top dead center of the piston rod, and is pressed against the lower surface of the inner cylinder, thereby forming a contact between the inner peripheral surface and the small diameter. The gap created between the valve member and the portion above the horizontal hole of the neck portion is actively closed, and furthermore, when the piston rod moves downward, the valve member and the thick annular portion come into closer contact with each other.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. 3. On the outer circumferential surface of the small diameter neck part 8, from a portion above the horizontal hole 9, a connecting part 8c between the small diameter neck part 8 and the upper shoulder part 8a.
A thick annular portion 16 is formed over the entire length, and the inner circumferential surface 6b of the valve member 6 is elastically abutted on this thick annular portion 16, thereby closing the gap 12.

Further, a plurality of thick annular portions 16 may be provided in some areas, or may be formed into a tapered shape that becomes thicker from the lower part of the small diameter neck portion 8 to the connecting portion 8c.

Note that the thick annular portion 16 is formed to close the gap 12 generated between the valve member 6 and the small diameter neck portion 8, so instead of forming it on the outer peripheral surface of the small diameter neck portion 8, the thick annular portion 16 is formed on the valve member. 6, or both the outer circumferential surface of the small diameter neck portion 8 and the inner circumferential surface 6b of the valve member 6.

[Effect of idea]

As described above, the present invention provides a thick annular portion on at least one of the outer circumferential surface of the small diameter neck portion and the inner circumferential surface of the valve member, and the thick annular portion and the valve member are in elastic contact with each other. At the top dead center of the piston rod, the gap created between the inner circumferential surface and the portion above the horizontal hole of the small diameter neck is actively closed, and the contents remaining in the liquid passage on the discharge port side of the piston rod are removed. Through this gap, it is possible to prevent inadvertent leakage to the outside from the gap between the piston rod and the center hole.

As a result, in addition to the air hole cutting off communication with the outside at the top dead center of the piston rod,
Even if the container falls over, the contents can be prevented from leaking to the outside.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of a conventional pump, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is an enlarged sectional view of the main part of the present invention. 1...Valve cylinder, 2...Upper valve, 3...Lower valve, 4
...Liquid chamber, 6...Valve member, 6a...Outside shoulder, 6
...Inner peripheral surface, 7...Piston rod, 7a...Discharge port side liquid passage, 8...Small diameter neck, 8a...Upper shoulder,
8b...Lower shoulder, 9...Horizontal hole, 10...Screw cap, 10a...Inner cylinder part, 11...Coil spring, 12...Gap, 13...Center hole, 14...Suction pipe, 15... ...Injection button, 16...Thick walled annular portion, 17...Air hole, 18...Lower valve side liquid passage.

Claims (1)

[Claims for Utility Model Registration] A valve cylinder 1 having an air hole 17 at the upper part and into which the inner cylinder part 10a of the screw cap 10 is fitted from above, and a valve cylinder 1 which is biased upward by a coil spring 11, A small-diameter neck portion 8 is provided between the shoulder portion 8b and the upper shoulder portion 8a that is inclined outwardly, and is provided with a horizontal hole 9 that communicates the internal discharge port side liquid passage 7a with the valve barrel 1. The piston rod 7 is attached to the small diameter neck portion 8 so as to seal the horizontal hole 9 with the inner peripheral surface 6b and form a lower valve side liquid passage 18 between the piston rod 7 and the piston rod 7. An elastic cylindrical member is sandwiched between the inner cylinder portion 10a and the lower shoulder portion 8b at the top dead center of the rod 7 and slides within the valve cylinder 1 below the air hole 17. When the piston rod 7 moves downward against the bias of the coil spring 11, the pressure of the contents that have entered the valve cylinder 1 via the lower valve 3 , the valve member 6 is expanded outward along the slope of the upper shoulder portion 8a to open the horizontal hole 9.
In the upper valve 2 of the spray pump, the contents in the valve barrel 1 are sent to the discharge port side liquid passage 7a via the lower valve side liquid passage 18 and the horizontal hole 9 by opening the upper valve 2, A thick annular portion 1 is provided on at least one of the outer circumferential surface of the small diameter neck portion 8 above the horizontal hole 9 and the inner circumferential surface portion of the valve member 6 corresponding to the portion.
6. An upper valve of a spray pump, comprising: