JP5388200B2 - Liquid discharge pump - Google Patents

Description

  The present invention relates to a liquid discharge pump.

  Conventionally, a stem is erected from a cylindrical piston that slides inside a pump cylinder, a pressing head with a nozzle is attached to the upper end of the stem, and the cylindrical piston moves up and down with respect to the lower half of the stem. Liquid that is configured to open and close the discharge valve formed between the lower piston and the lower half of the stem, and to discharge the contents in the pump cylinder from the nozzle through the upper half of the stem from the discharge valve A thing discharge pump is known (patent document 1).

JP-A-10-5640

  In the liquid material discharge pump of Patent Document 1, the pump chamber constituted by the cylindrical piston and the pump cylinder is filled with the liquid that is an incompressible fluid, so that when the pressing head is pressed down, the cylindrical piston Is deformed and bites into the lower half of the stem and is difficult to be separated, which increases the pressing force of the pressing head and makes it impossible to press down.

  A first object of the present invention is to form a stagnation part for the liquid flow in the pump inside the pump chamber, and to facilitate the depression of the depression head by the action of air remaining in the stagnation part.

  The second object of the present invention is to form an irregular surface for entrapment of bubbles in the stagnation portion so that an appropriate amount of air can be moored.

First, the first means is
A stem 24 is erected from a cylindrical piston 22 that slides in the pump cylinder 2, and a push-down head 70 with a nozzle is attached to the upper end of the stem 24, and the cylindrical piston 22 against the lower half 24 b of the stem. The discharge valve 36 formed between the cylindrical piston 22 and the lower half 24b of the stem is opened and closed by moving up and down, and the inside of the pump cylinder 2 passes through the upper half 24a of the stem from the discharge valve 36. In the liquid discharge pump provided to discharge the contents from the nozzle 72,
The lower half 24b of the stem 24 has a cylindrical wall that opens the lower surface into the pump cylinder 2,
A partition wall 52 that blocks the inside of the cylinder wall at a certain distance from the lower surface thereof is provided horizontally, and the inside of the air retaining cylinder 50 formed by the partition wall 52 and the cylinder wall portion below the partition wall is connected to the flow in the pump. By using the stagnation portion S, bubbles or air masses are moored in the air retaining cylinder, and the bubble mooring uneven surface 54 is formed inside the air retaining cylinder 50.

  This means proposes that a stagnation part S of the flow is provided inside the pump chamber P, and the air is moored in the form of bubbles B or air bubbles A in the stagnation part (see FIGS. 1 and 7). This is because the pushing-down of the push-down head in the liquid filling state becomes smooth due to the expansion / contraction action (air cushion action) of the bubbles. The reason why the inside of the top cylinder part (air retention cylinder) formed in the lower half part of the stem is used as the stagnation part is that bubbles easily gather at the upper part of the pump chamber due to the action of gravity. In the present specification, the “liquid material” includes mist and the like in addition to the liquid. From the operation of the present invention, it is assumed that the content sucked into the pump chamber is an incompressible fluid (that is, a liquid), but the ejected matter from the nozzle is not limited to a liquid.

  The “air retaining cylinder” has a function of attaching and mooring bubbles to the inner surface thereof. It is preferable to attach bubbles to the inner peripheral surface of the cylinder wall and the lower surface of the top wall (partition wall), but it is also possible to attach bubbles to the surface of the projection (rod part) from the top wall as shown in FIG. Conceivable. In the preferred embodiment, as the mode of the air retaining cylinder, a cylinder having a long cylinder length as shown in FIG. 1 and a cylinder having a short cylinder length as shown in FIG. 6 are illustrated, but both are compared with the cylinder diameter (diameter). The tube length is long. This is because it is easier to form the stagnation portion S inside the cylinder.

In addition, the present means proposes that the irregular surface for anchoring bubbles is formed inside the air retaining cylinder. As shown by an imaginary line in FIG. 3, the “concave surface for air bubble mooring” has a function of “holding” air bubbles B in the concave portion and mooring air. Such an uneven surface has a greater effect of anchoring bubbles in the place against the movement of the surrounding liquid than a smooth surface. As shown in FIG. 1, the uneven surface for anchoring bubbles is formed by a vertical rib provided on the inner surface of the cylinder wall of the air retaining tube, or an annular recess (or protrusion) drilled in the top wall as shown in FIG. Can be realized.

The second means includes the first means, and the plurality of vertical ribs 56 are provided vertically on the inner peripheral surface of the air retaining cylinder 50 to form the bubble mooring uneven surface 54.

  In this means, it is proposed that the concave and convex surface for anchoring bubbles is formed by vertical ribs as shown in FIG. This facilitates die removal when the lower half of the stem is molded.

The third means includes the first means or the second means , and the partition wall 52 is formed at the intermediate portion in the cylinder axial direction of the cylinder wall of the stem lower half 24b, and the cylinder wall portion above the partition wall 52 is formed. A liquid passage hole 60 is formed in the liquid crystal.

  In this means, as shown in FIG. 6, it is proposed to form a partition wall in the middle portion in the cylinder axial direction of the cylindrical wall of the lower half of the stem, and to make a liquid passage hole in the cylindrical wall portion above the partition wall. Yes. Thereby, the flow of the liquid on the downstream side of the discharge valve becomes smooth. Therefore, it is possible to reduce the force required to push down the push-down head.

  According to the first aspect of the present invention, since the air retaining cylinder 50 is formed in the pump chamber, the pressing head can be easily pushed down by contraction of the air bubbles anchored in the air retaining cylinder.

Further, according to the first aspect of the invention, since the bubble mooring uneven surface 54 is formed inside the air retaining cylinder 50, the bubbles can be securely anchored in the air retaining cylinder.

According to the second aspect of the invention, since the bubble mooring uneven surface 54 is formed by the vertical arrangement of the vertical ribs 56, it is easy to mold.

According to the invention relating to the third means, the partition wall 52 is formed in the middle portion in the cylinder axial direction of the cylindrical wall of the stem lower half 24b, and the liquid passage hole 60 is formed in the cylindrical wall portion above the partition wall 52. In addition, the fluidity of the liquid from the discharge valve 36 to the nozzle 72 can be improved.

It is a longitudinal cross-sectional view of the liquid discharge pump which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the main member of the pump of FIG. FIG. 3 is a cross-sectional view of the member of FIG. 2 in the III-III direction. It is a longitudinal cross-sectional view of the principal part of the liquid discharge pump which concerns on the 2nd Embodiment of this invention. It is a cross-sectional view of the VV direction of the member of FIG. It is a longitudinal cross-sectional view of the liquid discharge pump which concerns on the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st Example of this invention. It is a longitudinal cross-sectional view of the 2nd Example of this invention. FIG. 9 is a cross-sectional view in the IX-IX direction of the embodiment of FIG. 8. It is a longitudinal cross-sectional view of the 3rd Example of this invention. It is a cross-sectional view of the XI-XI direction of the embodiment of FIG.

  1 to 4 show a liquid material discharge pump according to a first embodiment of the present invention.

  As shown in FIG. 1, this liquid discharge pump is formed by a pump cylinder 2, a mounting member 12, and an operating member 20. Each component of the present invention can be formed of a synthetic resin.

  In the pump cylinder 2, the lower end portion of the cylinder tube wall 6 having the outward flange 4 at the upper end is reduced in diameter to form the suction valve 8, and the suction pipe 10 is suspended from the suction valve 8.

  The mounting member 12 is formed by a mounting cylinder 14 and a retaining cylinder 16. The mounting cylinder 14 is provided with an inward flange 14b on the upper end surface of the fitting cylinder 14a to the mouth / neck portion N of the container, and the pump cylinder is directed outwardly between the inward flange 14b and the mouth / neck portion N of the container. The flange 4 is sandwiched. In the illustrated example, a radially intermediate portion of the inward flange is raised upward to form a guide cylinder for a pressing head described later. The retaining cylinder 16 is fitted into the pump cylinder 2, and the upper portion of the retaining cylinder is locked to the inner edge of the inward flange 14b.

  The actuating member 20 has a stem 24 erected from the cylindrical piston 22 and a pressing head 70 with a nozzle 72 attached to the upper end of the stem. The lower surface of the operating member 20 and the inner surface of the pump cylinder 2 form a pump chamber P.

  The cylindrical piston 22 is formed by connecting a flange portion 22c projecting outward from a lower portion of the inner cylinder 22a to an intermediate portion in the vertical direction of the outer cylinder 22b. The outer cylinder 22b has both upper and lower portions having a large diameter at the tip, and the tip is in contact with the inner wall of the pump cylinder 2. The upper end of the outer cylinder is engaged with the lower end of the retaining cylinder 16.

The stem 24 is formed of an upper half (stem body) 24a and a lower half (piston guide) 24b. The upper half 24a is a vertically long cylinder as a whole, and the upper end is locked to the back side of the push-down head, and the lower end is inserted between the inner cylinder 22a and the outer cylinder 22b of the cylindrical piston. doing. On the inner peripheral surface 26 of the stem upper half 24a, a plurality of first contact protrusions 28 (a pair of left and right in the illustrated example) for abutting against the stem lower half 24b are provided vertically, and the stem lower half to form a liquid flow path P _L between the inner peripheral surface 26 of the outer peripheral surface portion and the stem upper half 24a of the section 24b. A stepped portion 29 for locking to the stem lower half 24b is formed at the middle in the vertical direction of the first abutting protrusion 28.

The lower half 24b of the stem is provided with a second abutting protrusion 30 for abutting with the inner cylinder 22a of the cylindrical piston at the lower part of the outer peripheral surface of the vertically long cylindrical wall. to form a liquid flow path P _M on the inner surface of the face lower and the inner cylinder 22a. Moreover, as shown in FIG. 2, the valve seat 32 protrudes outward from the lower end of the said cylinder wall. The valve seat 32 has an annular rim 34 standing up from the outer edge of the outward flange-shaped plate portion, and the lower end portion of the inner cylinder 22a of the cylindrical piston is fitted into the inner surface of the rim as shown in FIG. A valve 36 is formed. Therefore, if there is no cushioning action of air, which will be described later, the inner cylinder 22a may bite into the valve seat 32. Further, a leg cylinder 38 is suspended from below the valve seat 32, and a spring 40 is interposed between the leg cylinder and the lower part of the cylinder cylinder wall 6. Further, the skirt-like portion 42 projects downward and continuously from the leg cylinder and the valve seat, and slidably contacts the inner surface of the pump cylinder 2. This is like a skirt portion opens the communication hole 44, and opens the liquid passage P _U leading to the discharge valve 36 passes between the legs cylinder 38 and the cylinder tube wall 6 from the communication hole.

In the present invention, the upper end of the cylindrical wall of the stem lower half 24b is closed with the partition wall 52, and the cylinder wall 50 for air retention is formed by the cylindrical wall and the partition wall. The inside of the air retaining cylinder 50 is separated from the main liquid passage in the pump to form a stagnation portion S. That is, the liquid in the lower part of the pump cylinder passes through the fluid passages P _U , P _M , and P _L between the lower half part 24 b of the stem and the upper half part 24 a to the cylinder cylinder wall 6 from the communication hole 44, and then the nozzle Will head to 72. Compared with this flow, the movement of the liquid in the air retaining cylinder 50 is inactive, and it is therefore relatively easy to keep the bubbles present in the air retaining cylinder 50 in place.

  A plurality of vertical ribs 56 are provided vertically on the inner peripheral surface of the air retaining cylinder as shown in FIG. In this illustrated example, the vertical rib is formed on the inner peripheral surface of the air retaining cylinder except for the lower portion, but it may be formed over the entire length of the inner peripheral surface in the vertical direction. These vertical ribs 56 are arranged at an appropriate interval from each other, thereby forming a bubble mooring concave / convex surface 54 having an action of holding the bubble B between adjacent ribs as shown in FIG. Provided.

According to the configuration of the present invention, the following effects are exhibited. First, what is common to the prior art will be described. In the state of FIG. 1, the upper half portion 24 a and the lower half portion 24 b of the stem are lowered by the pressing of the pressing head 70. In the initial state, there is a gap between the flange 22c of the cylindrical piston and the lower end of the stem upper half 24a, so that the cylinder piston rises with respect to the stem lower half 24b due to an increase in the hydraulic pressure in the cylinder pump. Then, the discharge valve 36 opens. Then, the liquid in the cylinder pump 2 enters the push-down head 70 from the communication hole 44 through the liquid flow path P _U , the discharge valve 36, the liquid path P _M , and the liquid path P _L and is discharged from the nozzle.

  Next, in the configuration of the present invention, since the air retaining cylinder 50 is provided on the upper side of the cylinder chamber, the liquid is sucked into the pump cylinder 2 from the container side through the suction valve 8 for initial use. Bubbles remain on the bubble mooring uneven surface 54 in the air retaining cylinder. When the push-down head is pushed down, the air bubbles contract to serve as a cushion, and the air retaining cylinder 50 is lowered to relieve biting between the inner cylinder of the cylindrical piston and the valve seat. Thereby, the pressing head 70 can be easily pressed down.

  Hereinafter, other embodiments of the present invention will be described. In these descriptions, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  4 to 5 show a second embodiment of the present invention. In the present embodiment, one or a plurality of bubble anchoring step portions 58 are formed at appropriate positions in the longitudinal direction of the longitudinal ribs 56 of the lower stem half 24b. In this configuration, the bubbles can be anchored not only between the vertical ribs 56 but also in the downward step portion 58 for anchoring the bubbles. Therefore, the amount of air that can be moored in the air retaining cylinder can be increased as compared with the first embodiment.

FIG. 6 shows a third embodiment of the present invention. In the present embodiment, a partition wall 52 is provided laterally slightly below the middle portion of the cylinder wall of the lower stem half 24b in the vertical direction, and an air retaining cylinder 50 is formed by this partition wall and the cylinder wall portion below the partition wall. Yes. On the inner peripheral surface of the air retaining cylinder, vertical ribs 56 are provided vertically over the entire length of the cylinder. Also above the cylindrical wall portion of the partition is drilled a liquid holes 60, the liquid passing through the liquid passage P _M from the discharge valve 36, well into the halves in 24a on the stem through the liquid holes 60 well, also so that may enter the fluid path P _L between the stem upper half portion and the stem lower half. As a result, the fluid resistance can be reduced, and the pressing force of the pressing head can be reduced.

  FIG. 7 shows a first embodiment of the present invention. In this example, the vertical rib is simply omitted from the configuration of FIG. Also in this embodiment, as shown by an imaginary line in the figure, air mass A or bubbles can be kept on the back surface of the partition wall 52.

  8 and 9 show a second embodiment of the present invention. In this example, it is an improvement of the first embodiment, and a ring-shaped mooring groove 62 is formed on the back surface of the partition wall 52 with a boss at the center. Thereby, as shown in FIG. 9, the bubbles B are easily anchored in the bubble anchoring recess 62 of the partition wall 52.

  10 and 11 show a third embodiment of the present invention. In this example, a hanging bar 64 having a plurality of vertical grooves 66 formed vertically from the center of the partition wall 52 is suspended, and the surface of the hanging bar is used as a bubble mooring uneven surface 54.

DESCRIPTION OF SYMBOLS 2 ... Pump cylinder 4 ... Outward flange 6 ... Cylinder cylinder wall 8 ... Suction valve 10 ... Suction pipe 12 ... Mounting member 14 ... Mounting cylinder 14a ... Fitting cylinder 14b ... Inward flange 16 ... Stopping cylinder 20 ... Actuation Member 22 ... cylindrical piston 22a ... inner cylinder 22b ... outer cylinder 22c ... collar 24 ... stem 24a ... upper half 24b ... lower half 26 ... inner peripheral surface 28 ... first abutting protrusion 29 ... step 30 ... Second contact protrusion 32 ... Valve seat 34 ... Rim 36 ... Discharge valve 38 ... Leg cylinder 40 ... Spring 42 ... Skirt-like portion 44 ... Communication hole 50 ... Air retaining cylinder 52 ... Partition wall 54 ... Uneven surface for anchoring bubbles 56 ... Vertical rib 58 ... Downward stepped portion for bubble mooring 60 ... Liquid passage hole 62 ... Concave groove for bubble mooring 64 ... Drooping rod 66 ... Vertical groove 70 ... Depressing head 72 ... Nozzle P ... Pump chambers P _U , P _M , P _{L ...} liquid passage A ... air mass B ... bubbles N ... mouth neck S ... stagnation part

Claims (3)

A stem (24) is erected from a cylindrical piston (22) that slides in the pump cylinder (2), and a push-down head (70) with a nozzle is attached to the upper end of the stem (24). The discharge valve (36) formed between the cylindrical piston (22) and the lower half (24b) of the stem is opened and closed by raising and lowering the cylindrical piston (22) with respect to the half (24b). In the liquid discharge pump provided to discharge the contents in the pump cylinder (2) from the discharge valve (36) through the upper half (24a) of the stem from the nozzle (72),
The lower half (24b) of the stem (24) has a cylindrical wall that opens the lower surface into the pump cylinder (2),
A partition wall (52) for closing the inside of the cylinder wall with a certain distance from the lower surface is provided horizontally, and the inside of the air retaining cylinder (50) formed by the partition wall (52) and the cylinder wall portion below the partition wall is formed. By using the flow stagnation part (S) in the pump, air bubbles or air masses are moored in the air retaining cylinder, and the bubble mooring uneven surface (54) in the air retaining cylinder (50). A liquid material discharge pump characterized by comprising: By Tate設a plurality of longitudinal ribs (56) on the inner peripheral surface of the air retention for tube (50), the liquid product according to claim 1, characterized in that the formation of the bubble anchoring uneven surface (54) Discharge pump. The partition wall (52) is formed in the middle portion in the cylinder axial direction of the cylindrical wall of the lower half portion (24b) of the stem, and the liquid passage hole (60) is formed in the cylindrical wall portion above the partition wall (52). The liquid discharge pump according to claim 1 or 2 .

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