JP2554407Y2 - Liquid dispenser - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating pump type liquid dispenser to be mounted on various liquid containers for use, and more specifically, to improve a piston so that it works accurately in accordance with reciprocation. The creation of liquid dispensers.

[0002]

2. Description of the Related Art Conventionally, in an accumulator to be vertically suspended in a container, a slide having a discharge head on a head and a stem having a slidable cylindrical piston on a circumferential side is urged upward. A reciprocating pump type fitted with a suction valve at the bottom of the accumulator and a discharge valve between the piston and the stem that opens and closes the flow path from the inside of the accumulator to the inside of the stem by the contact and separation of the enlarged diameter part of the piston and the stem. (See, for example, Japanese Utility Model Application Laid-Open No. 59-8).
No. 2569, Japanese Utility Model Application Laid-Open No. 62-114672, etc.).

[0003] The liquid dispenser of this kind generates a reciprocating pump action consisting of suction and discharge by the vertical movement of the stem, and the specific action is as follows. When the stem rises during the suction stroke, the lower end of the piston comes into contact with the upper surface of the enlarged diameter portion of the stem due to the difference between the sliding resistance between the outer peripheral wall of the piston and the inner peripheral wall of the accumulator and the sliding resistance between the inner peripheral wall of the piston and the outer peripheral wall of the stem. Then, the discharge valve is closed, and the liquid in the container is sucked into the accumulator via the opened suction valve. Also, when the stem descends during the discharge stroke, the suction valve is closed and the piston stops at the spot due to the pressure of the liquid accumulated in the accumulator. As a result, the lower end of the piston separates from the upper surface of the enlarged diameter portion of the stem and discharges. The valve is opened, and the flow path from inside the accumulator to inside the stem is opened. Then, by further descending the stem, the piston descends together with the stem by the pressing portion provided on the stem, and the compressed liquid is discharged from the discharge through the communication passage of the stem.

[0004]

However, in the above-mentioned prior art, the sliding resistance between the outer peripheral wall of the piston and the inner peripheral wall of the accumulator is reduced due to loosening due to aging and the lubricating effect of the liquid to be poured out. Due to the sliding resistance between the inner peripheral wall of the piston and the outer peripheral wall of the stem, the piston is dragged by the stem and rises as it is, and as a result, the lower end of the piston does not contact the upper surface of the enlarged diameter portion of the stem, and the discharge valve is opened. There were problems that often happened.

[0005]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the problems of the prior art as described above. The pressing portion of the stem to be pressed against the pressing portion has a skirt shape made of an elastic material, and the piston has a conical surface set below the contacting portion with the pressing portion to be larger than the outer diameter of the pressing portion. , And is always in contact with

[0006]

According to the present invention, since the pressing portion of the stem is always in contact with the contact portion of the piston, the pressing portion in the form of a skirt made of an elastic material is formed by the conical surface of the piston. The force in the axial direction of the pressing portion, which is always pushed and expanded, and is to be pushed back by elasticity, acts as a force to push back the contact portion of the piston having a conical surface downward, and as a result, the lower end of the piston is moved to the lower end of the stem. An urging force is generated to constantly contact the upper surface of the enlarged diameter portion.

Therefore, when the stem is raised in the suction stroke, the urging force acts in addition to the difference between the sliding resistance between the outer peripheral wall of the piston and the inner peripheral wall of the accumulator and the sliding resistance between the inner peripheral wall of the piston and the outer peripheral wall of the stem. The lower end of the piston surely contacts the upper surface of the enlarged diameter portion of the stem, and the closing action of the discharge valve is realized.

When the stem descends during the discharge stroke, the piston stops at the position against the urging force due to the pressure of the liquid accumulated in the accumulator, and as a result, the lower end of the piston is raised from the upper surface of the enlarged diameter portion of the stem. The function of releasing and opening the discharge valve is realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, reference numeral 50 denotes an accumulator. The accumulator 50 is appropriately suspended from a liquid container (not shown) by a screw cap 51 provided at the upper end, and communicates with the inside of the container via a suction valve X and a tube 52 provided at the bottom. Suction valve X has valve hole 5
This is a conventionally known type in which OC is closed by seating a ball 40.

In FIG. 1, reference numeral 1 denotes a stem (in this specification, a series of movable members for an accumulator including a discharge head is referred to as a "stem").
1 and a communication window 1a for introducing liquid from the accumulator 50 at the time of discharge is provided below. The stem 1 is constantly urged upward by a coil spring 39. In this embodiment, the stem 1 is screwed and fixed to a screwing cap 51 so that the stem 1 can be locked in a depressed state at the time of conveyance or the like (the state of FIG. 2). ).

Reference numeral 3 in the drawing denotes a piston which cooperates with the stem 1 in the accumulator 50. This piston 3
Is cylindrical and fitted on the stem 1 so that the inner peripheral wall is on the outer peripheral wall of the stem 1 and the outer peripheral wall is on the accumulator 50.
Will be slid on the inner peripheral wall of the vehicle.

FIG. 3 is a diagram showing a main part of the present invention. In the drawing, reference numeral 4 denotes an enlarged diameter portion of a stem which constitutes the discharge valve Y in combination with the piston 3, and when the stem 1 is raised during the suction stroke, the lower end 3a of the piston is connected to the upper surface 4a of the enlarged diameter portion.
, The discharge valve is closed, and when the stem 1 is lowered during the discharge stroke, the lower end 3a of the piston becomes the upper surface 4a of the enlarged diameter portion.
Further, the discharge valve is opened. In the drawing, reference numeral 2 denotes a pressing portion of the stem which is to come into contact with and press the piston 3 when the stem 1 is lowered in the discharge stroke, and is formed in a skirt shape made of an elastic material (a synthetic resin material in this embodiment). . On the other hand, reference numeral 3b in the drawing denotes a contact portion of the piston with which the pressing portion 2 always contacts, and the lower portion is a conical surface set to be larger than the outer diameter of the pressing portion 2. The series of steps of the liquid dispenser in the above embodiment is as described in the section of the prior art and the operation.

[0013]

[Effects of the Invention] This invention having the above configuration has the following specific effects. The closing of the discharge valve during the suction stroke, which was uncertain in the conventional operation, is reliably achieved by constantly bringing the piston into contact with the expanded portion of the stem with a biasing force. A situation in which the discharge valve is inadvertently opened is eliminated. In addition, the above-mentioned biasing force is realized by devising the shape of the pressing part of the stem and the piston without using a special spring, so it is more reliable at the same cost as the conventional product without increasing the number of parts and assembly man-hours A liquid ejector with high performance can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a liquid dispenser of the present invention in a locked state.

FIG. 2 is a cross-sectional view of a suction stroke of the same.

FIG. 3 is a perspective view of an essential part of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stem 2 Pressing part 3 Piston 3b Contact part 4 Inflated part 50 Accumulator X Suction valve Y Discharge valve

Claims (1)

(57) [Scope of request for utility model registration] 1. An accumulator (50) to be suspended in a container, a stem (1) having a discharge head (11) as a head and a slidable cylindrical piston (3) on a peripheral side. ) Is slid in a state of being urged upward, a suction valve (X) is provided at the bottom of the accumulator (50), and an enlarged portion (4) of the piston and the stem is provided between the piston (3) and the stem (1). The accumulator (5)
0) Discharge valve (Y) that opens and closes the flow path from inside to the inside of the stem
In the reciprocating pump type spouter provided with the piston (3), the stem pressing part (2) to be brought into contact with the piston (3) when the stem descends and to press it is made into a skirt shape made of an elastic material, and the piston (3) is made. A liquid dispenser characterized in that a portion below the contact portion (3b) with the pressing portion (2) has a conical surface set to be larger than the outer diameter of the pressing portion, and is always in contact with the piston.