JP6501298B2 - Liquid discharge pump device and nozzle structure of liquid discharge pump device - Google Patents

Description

  The present invention relates to a liquid discharge pump device and a nozzle structure of the liquid discharge pump device.

The liquid attached to the container body as a general liquid discharge pump device, and the liquid pressurized in the pump chamber by the depression of the nozzle head is discharged from the nozzle through the second check valve, and the pump chamber is released by the release of the depression. There is known a system in which the pressure inside the container body is reduced and the liquid in the container body is sucked up into the pump chamber via the first check valve.
When the depression of the nozzle head is released, the second check valve shifts from the open state to the closed state due to the negative pressure in the pump chamber, but the negative pressure in the pump chamber is on the nozzle side in a short time required for the transition. It is known that a phenomenon (suck back) occurs which acts also on the flow path and sucks back the liquid inside the nozzle to the pump chamber side (see paragraphs 0003 and 0005 of Patent Document 1).

JP 2012-251440

  The above-mentioned suck back has the advantage of reducing dripping from the tip of the nozzle. However, since the suction force does not act on the liquid that has leaked to the outside (lower surface side of the nozzle) of the nozzle before the suck back acts, it can not be recovered to the pump chamber side. After all, there is a possibility that dripping may occur depending on the degree.

 In particular, since the nozzle of the liquid discharge pump device used for cosmetics is used by the hand at the time of discharge, the tip of the nozzle is often inclined downward, and the contents adhere to the outer wall surface of the nozzle There is something to do. In the case of a liquid having a small surface tension, even if the liquid is initially held on the outer wall surface, it may drip off while it is known by vibration etc. In the case of a liquid having a large surface tension, it is dried as it is. May remain as dirt. The dripping of the liquid and the adhesion to the periphery of the device not only contaminate the surroundings but also cause a problem that the user feels uncomfortable when using the device next time.

  An object of the present invention is to provide a liquid discharge pump device and a nozzle structure capable of effectively reducing the liquid dripping from the nozzle tip.

The first means is
It is the structure of a nozzle protrudingly provided laterally from the main body side of the liquid discharge pump device,
It has the nozzle cylinder 60 which opens the mouth 68 in the tip side,
A communication groove 74 communicating the lower side of the outer edge portion 72 of the opening 68 with the cylindrical hole h of the nozzle cylinder 60 is formed by vertically cutting the width-direction intermediate portion of the lower half of the opening 68 as viewed from below. did.

This means proposes providing the communication groove 74 on the lower side of the mouth of the nozzle cylinder 60 as shown in FIG. The communication groove is formed by vertically cutting the width-direction middle portion of the lower half portion of the opening 68 as viewed from below. As a result, the suction force of the suck back can be applied to the lower side of the nozzle cylinder 60 through the communication groove 74, and the liquid drip can be effectively reduced. Note that "the main body of the pump discharge device" means a portion of the device other than the nozzle cylinder.

The second means has a first means, and the opening 68 is formed as an opening cylinder 68A which can be fitted to the nozzle main body 61 formed by the nozzle cylinder portion other than the opening, and the communication groove 74 is formed. Were formed only in the mouth cylinder 68A.

  This means proposes the structure which fits the mouth cylinder 68A with the communication groove 74 to a nozzle main body, as shown to FIGS. 6-8. Since it is only necessary to fit the above-mentioned mouth cylinder 68A to the nozzle body, it can be applied to the nozzle head of the existing product, and the economic efficiency is improved. In particular, it is suitable for sucking back a relatively low surface tension liquid (for example, an oil-based cosmetic liquid).

The third means has the second means, and the communication groove 74 is disposed on the lower side of the cylinder hole h when the cylinder portion is fitted to the nozzle body in the above-mentioned cylinder 68A and the nozzle body 61. Positioning means I formed to

  In this means, as shown in FIGS. 7 and 8, a positioning means I is provided which is formed so that the communication groove 74 is disposed below the tube hole h when the mouth tube portion is fitted to the nozzle body. Is proposed. This facilitates the assembly of the mouth cylinder 68A.

A fourth means is a liquid discharge pump device including a nozzle head having the nozzle structure described in any of the first to third means, wherein
By depressing the nozzle head 52, the liquid in the pump chamber P is discharged from the nozzle cylinder 60 via the second check valve V2, and by releasing the depressing of the nozzle head 52, the negative pressure in the pump chamber P causes the outside The first liquid is sucked into the pump chamber P via the first check valve V1, and the negative pressure in the pump chamber P causes the liquid outside the cylindrical hole h of the nozzle cylinder 60 to flow from the communication groove 74 to the pump chamber P side. I tried to suck back.

  The present means proposes a liquid discharge pump device including a nozzle head having a nozzle structure as shown in FIGS. As parts other than a nozzle structure, the structure of the existing pump apparatus can be used.

According to the invention of the first means, by making the width direction intermediate part of the lower half of the opening 68 longitudinally cut when viewed from below , the lower side of the outer edge 72 of the opening and the nozzle cylinder 60 Since the communication groove 74 communicating with the cylindrical hole h is formed, air replacement can be easily performed, and the liquid transferred to the lower side of the outer edge portion 72 can be sucked back to the inside of the nozzle by the suck back of the pump device. The risk of dripping can be reduced or prevented. In addition, it is possible to prevent the finger from becoming dirty when the nozzle is accidentally touched with the finger.
According to the invention of the second means or the third means, since the communication groove 74 is provided in the port cylinder 68A, the present invention is applied only by attaching the port cylinder 68A to the nozzle portion of the existing liquid discharge pump device. It is economical, especially for liquids with relatively low surface tension.
According to the invention of the third means, since the positioning means I is provided, it is easy to attach the mouth cylinder 68A to the nozzle body 61 with the continuous groove 74 on the lower side.
According to the fourth aspect of the present invention, since the liquid discharge pump device includes the nozzle head having the above-described nozzle structure, liquid leakage from the nozzles can be effectively reduced, and the structure of the entire pump device is complicated. It will never be.

It is a longitudinal cross-sectional view of the liquid discharge pump apparatus which comprises the nozzle structure which concerns on 1st Embodiment of this invention. It is sectional drawing of the nozzle head of the liquid discharge pump apparatus of FIG. It is the bottom view which looked at the nozzle head of FIG. 2 from the III-III direction. It is the fragmentary view which looked at the mouth of the nozzle head of Drawing 2 from the IV-IV direction. FIG. 7 is an operation explanatory view of the liquid discharge pump device of FIG. 1; It is a longitudinal cross-sectional view of the liquid discharge pump apparatus which comprises the nozzle structure which concerns on 2nd Embodiment of this invention. It is a figure which shows the opening part of the nozzle head of the liquid discharge pump apparatus of FIG. It is a figure which shows the modification of the opening part of the nozzle head of the liquid discharge pump apparatus of FIG.

  FIGS. 1 to 5 show a liquid discharge pump device including a nozzle structure according to a first embodiment of the present invention. For convenience of explanation, first, the basic configuration of the liquid discharge pump device will be described.

  As shown in FIG. 1, this pump device is formed of a pump cylinder 2, a retaining cylinder 20, a mounting member 22, a poppet valve body 30 and an operating member 36. Each of these members can be molded of synthetic resin or metal unless otherwise specified.

The pump cylinder 2 is formed of a pump cylinder body 4 and a suction pipe 18. The pump cylinder main body 4 has a flange 6a at the upper portion of the peripheral wall 6 having a small diameter at the lower end in the illustrated example, and the inner surface of the lower end portion of the peripheral wall 6 is formed in the first valve seat 8. The fitting cylinder 10 is suspended. The upper portion of the suction pipe 18 is fitted to the fitting cylinder 10. Further, from the lower inner surface of the peripheral wall 6, a plurality of locking ribs 12 having an upward step 14 project inward at intervals in the circumferential direction. A packing 16 is attached to the lower surface of the collar 6a.

The retaining cylinder 20 is fitted to the upper inner surface of the pump cylinder 2 and is provided so as to be able to abut against a later-described cylindrical piston 50 to prevent detachment.

The mounting member 22 stands the protective cylinder portion 28 from the upper end of the mounting cylinder 24 for fitting to the opening of the container body via the inward flange 26.

The poppet valve body 30 is a rod-like member, and the fins 32 project outward from the outer surface of the lower portion. The poppet valve body 30 extends upward from inside the lower portion of the pump cylinder body 4 and is vertically movably supported by a seal portion described later. The lower end portion of the poppet valve body 30 faces the first valve seat 8 in this supported state, and the lower end portion and the first valve seat 8 form a first check valve V1. The fins 32 of the poppet valve body 30 are inserted into the gap between the locking ribs 12.

The actuating member 36 comprises a guide member 38, a stem 48, a cylindrical piston 50 and a nozzle head 52.

The guide member 38 has an annular seal portion 44 attached to the lower inner surface of the cylindrical wall 40 and a bowl-shaped second valve seat 46 projecting from the lower outer surface of the cylindrical wall 40. A coil spring S is interposed between the second valve seat 46 and the upward step 14 of the locking rib 12. The seal portion 44 is in contact with the outer peripheral surface of the poppet valve body 30.

The stem 48 is fitted on the upper portion of the cylindrical wall of the guide member 38 and stands upward of the pump cylinder 2. A communication groove 49 is vertically provided on the inner surface of the stem 48 at a position where the guide member 38 is fitted. In the illustrated example, the lower portion 48a of the stem 48 is a large diameter portion.

The cylindrical piston 50 has a double cylindrical shape consisting of an inner cylindrical portion 50a and an outer cylindrical portion 50b in the illustrated example, and is continuous at the vertical direction middle portions of the inner cylindrical portion 50a and the outer cylindrical portion 50b. The upper and lower portions of the outer cylindrical portion 50b are slidably fitted on the inner surface of the pump cylinder main body 4 as a skirt shaped portion having a large diameter at the tip. The lower portion of the inner cylindrical portion 50a is formed so as to be able to be seated on the second valve seat 46, and a second check valve V2 is formed by the lower portion of the inner cylindrical portion 50a and the second valve seat 46. . The upper portion of the inner cylindrical portion 50a is fluidly and slidably fitted on the inner surface of the lower portion 48a of the stem 48.

The nozzle head 52 is attached to the upper portion 48 b of the stem 48. In the illustrated example, the inner peripheral wall 54 and the outer peripheral wall 56 are respectively suspended from the outer peripheral portion of the top wall of the nozzle head 52. However, such a structure can be suitably changed. The inner peripheral wall 54 is fitted to the upper portion 48b of the stem 48 with a constant gap between the inner peripheral wall 54 and the top wall. From the upper portion of the inner peripheral wall 54, the nozzle cylinder 60 protrudes forward through the upper portion of the outer peripheral wall 56.

In the above configuration, when the pump of the present invention is attached to the neck of the container body and the nozzle head 52 is depressed, the guide member 38 is lowered relative to the cylindrical piston 50 to open the second check valve V2 and The poppet valve body 30 is lowered together with the guide member 38 to close the first check valve V1 (see FIG. 5). As a result, from the pump chamber P (the space between the lower surface of the second valve seat 46 and the lower portion of the pump cylinder 2), the stem passes through the liquid flow path L between the second valve seat 46 and the pump cylinder 2 The nozzle tube 60 is discharged to the outside through 48.

When the depression of the nozzle head 52 is released, the guide member 38 is pushed up by the coil spring S, and the poppet valve body 30 is also pulled up by the friction with the seal portion 44. Thereby, the first check valve V1 is opened. The poppet valve body 30 stops rising when the fins 32 contact the lower end of the coil spring S. The stem 48 further ascends with the guide member 38, while the cylindrical piston 50 does not ascend, so the second check valve V2 closes. As a result, suckback occurs due to negative pressure in the pump chamber from when the guide member 38 starts to rise until the second check valve V2 closes.

  In the present invention, as shown in FIG. 2, a communication groove 74 is formed below the port 68 of the nozzle cylinder 60. As shown in FIG. 4, the communication groove 74 longitudinally cuts at least the lower side of the opening 68 in the cylinder radial direction and the lower side of the outer edge 72 of the opening 68 as viewed from the cylinder axial direction of the nozzle cylinder 60. It is provided in communication with the cylindrical hole h of the nozzle cylinder 60. By providing the communication groove 74, air is replaced, and as shown in FIG. 5, the liquid w in the vicinity of the communication groove is drawn to the pump chamber side by suckback, and drawn as compared with the case without the communication groove. Quantity will increase.

In the illustrated example, the nozzle cylinder 60 is continuously formed from the horizontal cylinder portion 62 oriented substantially horizontally to the inclined cylinder portion 66 extending diagonally downward via the bending portion 64.
The nozzle cylinder 60 may be configured to have only the horizontal cylinder portion 62 substantially in the horizontal direction, and the bending portion 64 and the inclined cylinder portion 66 may not be provided.

  When using it with respect to the liquid with large surface tension like a water-based makeup liquid, the said communication groove 74 is good to form the communication groove 74 directly in the nozzle cylinder 60 below. In the present embodiment, the communication groove 74 extends in the form of a slit upstream from the port 68 as shown in FIG. 3 as viewed from below. The communication groove 74 in the illustrated example is provided in the inclined cylindrical portion 66. Further, the proximal end 76 of the communication groove 74 is formed vertically as shown in FIG.

  In the illustrated example, the communication groove 74 is formed in a straight line with a constant width when viewed from below. The width of the communication groove 74 is made as small as possible so as not to impair the function of the nozzle cylinder 60 as a liquid passage in consideration of the surface tension of the liquid.

  Although the liquid discharge pump device of the above-mentioned patent document 1 is comprised so that a suckback may act strongly, some suckbacks will be produced also with a normal pump apparatus. Even with the suction force of a normal suck back, it is possible to reliably draw in the liquid temporarily accumulated on the lower surface side of the opening of the nozzle regardless of the length of the communication groove and the width of the communication groove.

  Hereinafter, other embodiments of the present invention will be described. Description of the same configuration as the first embodiment is omitted in these descriptions.

  6 to 8 show a liquid discharge pump device including a nozzle structure according to a second embodiment of the present invention. In the present embodiment, the opening 68 of the nozzle cylinder 60 is formed as an opening cylinder 68A separate from the nozzle main body 61, and the communication groove 74 is formed only in the opening cylinder 68A. This configuration is particularly suitable for liquids with low surface tension, such as oil-based cosmetic liquids.

  The mouth cylinder 68 </ b> A is provided on the outer surface of the cylinder wall 69 near the tip of the cylinder wall 69 to surround the collar 70. A portion of the cylindrical wall 69 opposite to the tip end is fitted into the inside of the nozzle body 61. Then, a communication groove 74 is formed by longitudinally cutting the lower portion of the mouth cylinder 68A shown in FIG. 6 from the cylinder wall 69 to the flange portion 70. Further, on the upper side of the collar portion 70, an engagement concave portion 71 is formed. An engagement protrusion 67 which is fitted into the engagement recess 71 is projected on the tip end surface of the nozzle main body 61, and the positioning recess I and the engagement protrusion 67 form a positioning means I. That is, as shown in FIG. 7, the communication groove 74 is always positioned on the lower side when the mouth cylinder 68A is fitted to the nozzle main body 61 by fitting the engagement projection into the engagement recess. . Note that, unlike the illustrated example, the engagement protrusion may be provided on the mouth side, and the engagement recess may be provided on the nozzle body side.

As in the present embodiment, in the case where the communication groove is formed only in the mouth cylinder 68A, the liquid w remains near the lower end surface of the nozzle cylinder 60 (the lower position of the communication groove 74 provided in the mouth cylinder 68A), The content can be drawn into the nozzle cylinder by the suck back effect of the pump.
Therefore, compared with the first embodiment, the second embodiment exhibits the effect (prevention of dripping) because the space where the liquid w can be temporarily held (pooled) is provided.

  In the illustrated example shown in FIG. 7, the cylindrical hole h of the mouth cylinder 68A is formed in a circular shape as viewed from the cylinder axial direction.

  FIG. 8 shows a modification of the present embodiment, in which the cylindrical hole h of the mouth cylinder 68A is formed in a rectangular shape as viewed from the cylinder axial direction. In the illustrated example, the communication groove 74 is formed by longitudinally cutting a portion corresponding to the middle portion of one side of the rectangle. However, these shapes can be changed as appropriate. With regard to the shape of the cylindrical hole h of the nozzle cylinder, the effects of the present invention can be similarly obtained with shapes other than circular and rectangular.

2 ... pump cylinder 4 ... pump cylinder main body 6 ... peripheral wall 6a ... flange 8 ... first valve seat 10 ... fitting cylinder 12 ... locking rib 14 ... upward step 16 ... packing 18 ... suction pipe 20 ... removal cylinder 22 ... mounting member 24 ... mounting cylinder 26 ... inward flange 28 ... protective cylinder 30 ... poppet valve body 32 ... fin
36 ... actuating member 38 ... guide member 40 ... cylinder wall 42 ... communication hole 44 ... seal part 46 ... second valve seat 48 ... stem 48a ... stem lower part 48b ... stem upper part 50 ... cylindrical piston 50a ... inner cylinder part 50b ... outside Cylinder part 52: Nozzle head 54: Inner peripheral wall 56: Outer peripheral wall 60: Nozzle cylinder 61: Nozzle main body 62: Horizontal cylinder part 64: Bent part 66: Inclined cylinder part 67: Engaging projection 68: Port 68A: Port cylinder 69: cylinder wall 70: flange portion 71: engagement concave portion 72: outer edge portion 74: communication groove 76: base end h: cylindrical hole I: positioning means L: liquid flow path P: pump chamber S: coil spring
V1 ... first check valve V2 ... second check valve w ... liquid

Claims (4)

It is the structure of a nozzle protrudingly provided laterally from the main body side of the liquid discharge pump device,
It has a nozzle cylinder (60) which opens a mouth (68) at the tip end side,
The lower side of the outer edge portion (72) of the opening (68) is cut through the nozzle hole (60) of the nozzle tube (60) by vertically cutting the width direction middle portion of the lower half of the opening (68) as viewed from below. h) A nozzle structure of a liquid discharge pump device characterized in that a communication groove (74) communicating with the h) is formed.   The mouth portion (68) is formed as a mouth cylinder (68A) which can be fitted to the nozzle main body (61) formed by the nozzle cylinder portion other than the mouth portion, and the communication groove (74) is formed in the mouth cylinder (68A). The nozzle structure of a liquid discharge pump device according to claim 1, wherein the nozzle structure is only formed.   Positioning means formed such that the communication groove (74) is disposed below the cylindrical hole (h) when the cylindrical body is fitted to the nozzle body in the above-mentioned mouth cylinder (68A) and nozzle body (61) The nozzle structure of a liquid discharge pump device according to claim 2, wherein (I) is provided. A liquid discharge pump device comprising a nozzle head having the nozzle structure according to any one of claims 1 to 3;
By depressing the nozzle head (52), the liquid in the pump chamber (P) is discharged from the nozzle tube (60) via the second check valve (V2), and the depression of the nozzle head (52) is released. The negative pressure in the pump chamber (P) sucks the external liquid into the pump chamber (P) via the first check valve (V1), and the negative pressure in the pump chamber (P) A liquid discharge pump device characterized in that liquid outside the cylindrical hole (h) is sucked back from the communication groove (74) to the pump chamber (P) side.