JPH0528447U - Liquid ejector - Google Patents

Abstract

(57) [Abstract] [Purpose] A pump in which a tubular piston is fitted to the lower part of the stem so as to be vertically movable within a certain range, and a discharge valve hole which is opened and closed by the vertical movement of the tubular piston is formed in the lower part of the stem. In the liquid ejector, the vertical movement of the cylindrical piston is made easy and reliable, and the stroke thereof is reduced so that the liquid is efficiently sucked into the cylinder. [Structure] The stem portion below the discharge valve hole 15 is a large-diameter cylindrical portion 14a with an upper surface closed, and a cylindrical piston 18 is fitted to the outer surface of the stem 14 from the lower outer surface of an inner cylinder 20 having a small inner diameter at the upper end to the skirt. The end portions of the skirt-like portions are formed so as to project vertically and laterally outwardly by press-contacting the inner wall surface of the cylinder 5, and when the tubular piston descends, the entire lower end of the inner cylinder 20 has a large-diameter tubular portion. 14a
Close to the upper surface of the
Was provided so that it would be blocked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This proposal relates to a liquid ejector.

[0002]

[Prior Art]

 For example, in the liquid ejector disclosed in Japanese Utility Model Laid-Open No. 59-82569, a cylinder is hung from a mounting cylinder for fitting a neck of a container body, and an actuating member that is urged from the inside of the cylinder and stands up is provided. A discharge valve hole that is closed by a tubular piston when it descends is formed by a cylindrical piston that fits under the stem in a watertight manner and vertically movable within a certain range, and a head with a nozzle that fits on the upper end of the stem. The cylindrical piston is drilled in the lower part, and both the inner and outer cylinders are continuous double cylinders in the middle part.The inner cylinder is watertightly fitted to the outer surface of the stem, and both upper and lower parts of the outer cylinder are connected. It is bent vertically and laterally outward so that the outer surface of each tip of both parts is pressed against the inner wall surface of the cylinder.

[0003]

[Problems to be solved by the device]

 In the conventional liquid ejector described above, when the actuating member is pushed upward from the state of being urged, the suction valve at the lower end of the cylinder is closed and the cylindrical piston opens the discharge valve hole and descends. By doing so, the liquid in the cylinder is ejected from the nozzle of the operating member, and the suction valve opens when the operating member rises from the lowered state, and the discharge valve hole is closed by the cylindrical piston, and the liquid inside the container is stored in the cylinder. Although it is designed to be sucked in, the discharge valve hole is opened and closed directly on the inner cylinder inner wall surface of the cylindrical piston that moves up and down with respect to the stem, so the contact area of the inner cylinder inner wall surface with the stem If the inner diameter of the inner cylinder is not appropriate, the sliding of the cylindrical piston with respect to the stem will become unstable, and the inner cylinder will not seal the discharge valve hole. Incomplete closure And thus the allowable range of dimensional error of the cylindrical piston inner tube inside diameter relative to the stem outer diameter was small.

According to the present invention, the contact area of the cylindrical piston inner cylinder with respect to the stem is narrowed to reduce the frictional resistance to expand the allowable range, and the opening and closing of the discharge valve hole is directly performed by the cylindrical piston inner cylinder. Rather than performing on the inner wall surface, by sealing against the stem by the small inner diameter part at the upper end of the inner cylinder and by pressing the lower end surface of the inner cylinder against the upper surface of the large diameter cylinder part with the upper surface closed at the lower part of the stem, Even if the stroke of the cylindrical piston with respect to the stem is small, the opening and closing of the discharge valve hole is ensured.

[0005]

[Means for Solving the Problems]

 The cylinder is hung from the mounting cylinder for fitting the neck of the container body, and the operating member that is urged from the cylinder and stands up is fitted in the stem and below the stem in a watertight manner and vertically movable within a certain range. In a liquid ejector in which a tubular piston and a head with a nozzle fitted on the upper end of the stem are formed to close the tubular piston when it descends, 15 The lower stem portion is used as a large-diameter cylindrical portion 14a with the upper surface closed, and the cylindrical piston 18 is fitted to the outer surface of the stem 14 from the lower outer surface of the inner cylinder 20 with a small inner diameter at the upper end to the skirt-shaped portion 19 , 19 are formed so as to project vertically and laterally outward by pressing the tip of the skirt-shaped portion against the inner wall surface of the cylinder, and when the cylindrical piston descends, the entire lower end of the inner cylinder 20 is brought to the upper surface of the large-diameter cylindrical portion 14a. Formed intimately possible.

[0006]

[Action]

 From the state shown in FIG. 1, the stem fitting tube 24 is unscrewed from the auxiliary tube 26 at the upper end of the cylinder 5 to raise the operating member 12 by the biasing force of the spring 13, and the operating member is moved vertically with respect to the cylinder 5 from this state. By doing so, the liquid in the container provided with the liquid ejector is sucked up into the cylinder, and the liquid in the cylinder is ejected from the nozzle 22. When the operating member 12 is at the lower limit, as shown in FIG. 1, the upper end surface of the inner cylinder of the cylindrical piston 18 contacts the lower surface of the stopper 16 of the stem, and at this time, the discharge valve hole 15 communicates with the lower cylinder. However, when the operating member rises from the lower limit position, the stem 14 first rises as shown in FIG. 2, and the inner cylinder 20 of the cylindrical piston 18 stopped by the pressure contact with the inner wall surface of the cylinder 5 has a large diameter cylinder. The outer periphery of the upper surface of the portion 14a is in contact, and thus the communication between the discharge valve hole 15 and the inside of the cylinder is blocked. In this state, the tubular piston 18 also rises together with the stem, and at the upper limit, the lower end surface of the tubular body 30 that hangs from the lower end of the threaded tubular portion 29 of the auxiliary tube 26 is in contact with the upper end surface of the inner tube 20 of the tubular piston. Stem 14 stops. By pushing down from the upper limit, the stem 14 first descends with respect to the cylindrical piston 18 pressed against the inner wall surface of the cylinder to open the discharge valve, and then the stopper 16 of the stem contacts the upper end surface of the inner cylinder 20 and pushes it down. Then, the cylindrical piston 18 also descends.

[0007]

【Example】

 The ejector of the present invention comprises a mounting cylinder 1, a cylinder 5, an operating member 12 and an auxiliary cylinder 26.

The mounting cylinder 1 is provided with an inward flange 3 at the upper end of the peripheral wall 2.

The cylinder 5 has a mounting cylinder portion 6 hung from an outer surface of an upper portion thereof via a first outward flange, fitted into the flange hole of the mounting cylinder 1 described above, and attached to a lower end of the mounting cylinder portion 6. The lower surface of the second outward flange 7 is engaged with the upper end surface of the mouth / neck portion of the container body through the packing 8, and the second outward flange 7 is sandwiched between the lower surface of the inward flange 3 and the upper end surface of the mouth / neck portion described above. Let Further, the lower portion of the cylinder 5 is a small inner diameter cylinder portion 5a, a suction valve 9 is provided in the cylinder portion below the small inner diameter cylinder portion, and a suction pipe 10 is hung from the lower end of the cylinder 1. ..

The operating member 12 is composed of a stem 14, a cylindrical piston 18, and a head 23 with a nozzle 22, and is urged upward by a spring 13. The stem 14 has a discharge valve hole 15 formed in a lower portion thereof, and a stem portion below the discharge valve hole is formed as a large-diameter cylindrical portion 14a having an upper surface closed to open a lower surface. The small inner diameter tubular portion 5a is watertightly and detachably fitted to the inner surface of the upper portion, and the stopper 16 is attached to the outer surface of the stem portion above the discharge valve hole 15.

The tubular piston 18 is vertically and laterally outwardly pressed from the lower outer surface of the inner cylinder 20 having a small inner diameter at the upper end, which is watertightly fitted to the outer surface of the stem portion below the stopper 16, to press the tip end against the inner wall of the cylinder. The skirt-shaped portions 19 and 19 are projected. The cylindrical piston can move up and down between the stopper 6 and the large-diameter cylindrical portion 14a, and when the lower end surface of the inner cylinder 20 contacts the upper surface of the large-diameter cylindrical portion, the discharge valve hole 15 and the cylindrical piston 18 The discharge valve formed by and is closed, and the lower end of the inner cylinder 20 is separated from the upper surface of the large-diameter cylindrical portion, so that the discharge valve opens.

The head 23 with the nozzle 22 has a stem fitting cylinder 24 hung from the lower surface thereof fitted to the outer surface of the upper portion of the above-described stem 14.

The auxiliary cylinder 26 has an outer cylinder part 27 fitted to the outer surface of the upper part of the cylinder 5 described above. From the inner peripheral edge of the inward flange-shaped upper wall 28 attached to the upper end of the outer cylinder part to the screw cylinder part 29. To hang the threaded tube portion on the outer surface of the stem fitting tube 24 described above, and hang down the tubed body 30 that defines the upper limit position of the tubed piston 18 from the lower end of the threaded tube section. An inner cylindrical portion 31 vertically extending from the lower surface of the middle portion of the upper wall 28 is fitted to the upper inner surface of the cylinder 5 described above.

[0014]

[Effect of the device]

 The present invention is configured as described above, and since the inner cylinder 18 of the cylindrical piston 18 watertightly fitted to the lower outer surface of the stem 14 has a small inner diameter only at the upper end portion, only the inner surface of the small inner diameter portion has a small inner diameter. Therefore, the contact area of the inner cylinder 18 with respect to the stem can be reduced and the frictional resistance can be reduced, and if the contact area with the stem is reduced as described above, the inner surface of the inner cylinder 18 can be reduced. It should not be possible to open and close the discharge valve hole 15 by means of this, but in this proposal, the lower part of the stem is made a large-diameter cylindrical part 14a with the upper surface closed, and when the cylindrical piston 18 descends, the entire lower end of the inner cylinder 20 becomes Since it is provided so as to close the liquid inlet to the discharge valve hole 15 by pressing it to the outer periphery of the upper surface of the discharge valve, the opening and closing of the discharge valve becomes uncertain regardless of whether only the upper end of the inner cylinder has a small inner diameter portion. There is no. Furthermore, if the opening / closing of the discharge valve hole is performed directly on the inner surface of the inner cylinder as in the above-mentioned conventional example, the discharge valve hole will be completely opened / closed unless the inner cylinder is moved up and down by at least the length of the discharge valve hole. Although this is not possible, in the present proposal, the contact of the small inner diameter portion of the upper end of the inner cylinder 20 with the outer surface of the system and the contact of the entire lower surface of the inner cylinder with the upper surface of the large diameter cylinder portion 14a at the lower end of the stem are performed. Even if the lower end is slightly separated from the upper surface of the large-diameter cylinder, the liquid will flow into the discharge valve hole 15 through the space between the large inner diameter below the small inner diameter of the inner cylinder and the outer surface of the stem. The stroke of the cylindrical piston can be shortened, and therefore the discharge valve can be opened and closed more quickly than when the cylindrical piston has a long stroke. Therefore, liquid suction into the cylinder and The liquid can also be efficiently discharged from the.

[Brief description of drawings]

FIG. 1 is a half sectional view of a liquid ejector of the present invention.

FIG. 2 is a cross-sectional view of a main part of an ejector showing a discharge valve closed state.

FIG. 3 is a cross-sectional view of a main part of the ejector, showing a state where the operating member is located at the upper limit.

[Explanation of symbols]

 14 Stem 15 Discharge valve hole 18 Cylindrical piston 20 Inner cylinder

Claims (1)

[Scope of utility model registration request] 1. A cylinder hangs down from a mounting cylinder for fitting a neck of a container body, and an actuating member which is urged from the inside of the cylinder and stands up is vertically and water-tightly movable within a certain range to a stem and below the stem. In a liquid ejector having a discharge valve hole formed at the lower portion of the stem, which is formed by a cylindrical piston fitted to the upper end of the stem and a head with a nozzle fitted to the upper end of the stem, and closed when the cylindrical piston descends. The stem portion below the valve hole 15 is formed as a large-diameter cylindrical portion 14a with the upper surface closed, and the cylindrical piston 18 is fitted to the outer surface of the stem 14 from the lower outer surface of the inner cylinder 20 having the small inner diameter at the upper end and the skirt shape. The portions 19, 19 are formed to project vertically and laterally outward by pressing the tip of the skirt-shaped portion against the inner wall surface of the cylinder, and when the cylindrical piston descends, the inner cylinder
20 A liquid ejector characterized in that the entire lower end is formed so as to be in close contact with the upper surface of the large-diameter cylindrical portion 14a.