JP5733752B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device, and more particularly to a pump device applied to the mouth and neck of a container body.

  As this kind of pump device, an operating member biased upward from the inside of the pump cylinder is erected, and the poppet valve body extending upward from the lower part of the pump cylinder moves up and down within a certain range in conjunction with the vertical movement of the operating member. One is known (Patent Document 1).

  The actuating member includes a seal cylinder having a communicating hole in the middle portion in the vertical direction of the cylinder wall and in contact with the outer surface of the poppet valve body at the lower part of the cylinder wall, a stem protruding upward from the upper part of the seal cylinder, and the seal cylinder And a cylindrical piston fitted between the lower portions of the stem and a nozzle head attached to the upper end of the stem, and the seal cylinder and the stem descend with respect to the cylindrical piston after the liquid discharge process Thus, the liquid is sucked back from the nozzle side (back suction), so that the nozzle runs out well.

JP 2009-154900 A

  The backsuction function of the pump device is effective for preventing solidification of the contents, preventing discoloration, preventing dripping, etc. in addition to improving the drainage of the nozzle. However, that of Patent Document 1 is such that the content is sucked back from the tip of the nozzle, which is not always sufficient.

  An object of the present invention is to propose a pump device that enhances the back suction effect by effectively utilizing the negative pressure in the pump cylinder.

The first means comprises a pump cylinder 2 having a first valve seat 10 for the suction valve V ₁ at the bottom,
A poppet valve body 30 that extends upward from the first valve seat 10 and is movable up and down within a certain range;
An actuating member 40 standing up from the inside of the pump cylinder 2,
This actuating member 40 is
An annular seal portion 48 that is urged upward and is in contact with the poppet valve body 30 on the inner surface of the lower portion of the tube wall, a second valve seat 50 is provided on the outer surface of the lower portion of the tube wall, and has a communication hole 46 in the middle portion of the tube wall 42 and
A stem 54 that is fitted to the upper part of the cylinder wall of the seal cylinder 42 and rises upward;
A cylindrical piston 60 loosely inserted between the stem 54 and the second valve seat 50 and fitted to the inner surface of the pump cylinder 2;
A nozzle head 70 attached to the upper portion 54b of the stem 54,
A seal cylinder 42 and the poppet valve body 30 is lowered discharge valve V ₂ is opened and the first step of the suction valve V ₁ is closed by depression of the nozzle head 70, the poppet valve body 30 by increasing the seal cylinder 42 In a pump apparatus that performs suction and discharge of liquid through a second process in which the suction valve is opened and the cylindrical piston 60 is returned to the discharge valve closed state and a third process in which the cylindrical piston 60 and the seal cylinder 42 are raised. ,
The outer surface of the poppet valve body 30 is provided with a channel portion of the seal portion upstream P ₁ and the seal portion downstream of the flow path portion P ₃ a communicating recess 34 that communicates with the third step,
Small downstream most flow area of the most flow path of smaller upstream the narrowest portion S _U of the area channel width D _U seal portion downstream of the flow path portion P ₃ of the sealing portion upstream of the flow path portion P ₁ it is smaller than the channel width D _L of the narrowest portion S _L.

This means proposes to provide a communication recess 34 on the outer peripheral surface of the poppet valve body 30 of the pump device (see FIGS. 1 and 2). The pump cycle of this type of pump device consists of the following processes.
(1) The seal cylinder 42 and the poppet valve body 30 are lowered, the suction valve V ₁ is closed, and the discharge valve V ₂ is opened (FIG. 3A).
(2) seal cylinder 42 and the suction valve V ₁ is opened poppet valve body 30 is raised (FIG. 3 (B)), stopping after the seal cylinder 42 of the poppet valve body 30 to and the discharge valve V ₂ rises Close (FIG. 3C).
(3) After the discharge valve _{V 2} is closed even seal cylinder 42 is raised (FIG. 3 (D)).
Although also produces back sack Deployment via the discharge valve V ₂ in the second step, a feature of the present invention is to produce a back sack Deployment through the communication recess 34 in the third step (Fig. 4). The communication recess 34 in order is arranged so as to communicate the flow path portion P ₁ and the sealing portion downstream of the flow path portion P ₃ of the seal portion upstream in the third step.
Further, in this means, as shown in FIG. 5, the flow path width D _U of the upstream side most narrowed part S _U is made smaller than the flow path width D _L of the downstream side most narrowed part S _L. This facilitates back sucking from the nozzle.

In this specification, “upstream” and “downstream” refer to upstream / downstream of the flow in the forward direction from the suction pipe to the nozzle through the suction valve and the discharge valve to the nozzle. In the illustrated example, the flow path portion P ₁ upstream of the seal portion is a flow passage portion from the suction pipe 20 side to the seal portion 48, and the flow passage portion P ₃ downstream of the seal portion is a flow from the seal portion 48 to the nozzle 76. It is a road part.

  The second means has the first means, and the communication recess 34 is formed in a vertical groove.

  In this means, it is proposed that the communication recess is formed in a vertical groove as shown in FIG. As a result, the back suction effect can be maintained while the seal portion 48 is moving within the range of the vertical length of the vertical groove (see FIG. 4).

Third means includes a first means or the second means, and with hanging the suction pipe 20 from the suction valve V ₁ side of the pump cylinder 2, cylinder for inner diameter adjusted to the lower end portion inner surface The adapter 21 is fitted.

  This means proposes a cylindrical adapter 21 fitted into the lower end of the suction pipe 20 as shown in FIG. Since the cylindrical adapter 21 can be appropriately prepared by preparing ones having different inner diameters and lengths, the flow path resistance can be easily adjusted.

The fourth means includes any one of the first means to the third means, and the upper portion 54b of the stem 54 is formed into a cylindrical shape, and the nozzle 76 of the nozzle head 70 on one side of the upper portion is provided. A through hole 56 communicating with the base is opened, and the inner peripheral surface of the upper portion 54b of the stem 54 excluding the opening is suspended.

  In this means, as shown in FIG. 7, the shape of the upper part 54b of the stem 54 is a crested cylinder. By making it a topped cylindrical shape, the contact area of the nozzle head 70 with respect to the content liquid is reduced. Furthermore, if the content liquid is drawn from the inside of the nozzle 76 into the stem 54, the content liquid will not come into contact with the nozzle head 70, so that the stem 54 is made of a material that does not easily swell to the vicinity of the nozzle opening. Even if it is caused by the material, there is no inconvenience such as liquid leakage. This will be described later.

According to the invention according to the first means, the outer surface of the poppet valve body 30, since providing the communication recess 34 for communicating the channel portion of the seal portion upstream P ₁ and the seal portion downstream of the flow path portion P ₃ in the suction process The backsuction effect is improved.
According to the invention according to the first aspect, since channel width D _U upstream the narrowest portion S _U is but smaller than the channel width D _L of the downstream-side outermost stenosis S _L, more back sacks Deployment effect Rise.
According to the second aspect of the invention, since the communication recess 34 is formed as a vertical groove, the back sucking action is continued while the seal portion 48 passes through the vertical groove corresponding to the vertical length of the vertical groove. it can. According to the third aspect of the invention, since the cylindrical adapter 21 is fitted to the inner surface of the lower end portion of the suction pipe 20, the inner diameter of the flow path can be reduced by a simple procedure.
According to the invention relating to the fourth means, since the upper portion 54b of the stem 54 has a top-end cylindrical shape, the contact area of the nozzle head 70 with respect to the content liquid is reduced, and the action of pulling from the inside of the nozzle 76 toward the stem 54 side In combination, molding the nozzle head 70 with a material that swells more easily than the stem 54 does not cause any inconvenience.

It is a partially cutaway side view of the pump device according to the first embodiment of the present invention. It is the front view (the figure A) of the poppet valve of the pump apparatus of FIG. 1, and the cross-sectional view (the figure B) which looked at the figure in the 2B-2B direction. It is action | operation explanatory drawing of the pump apparatus of FIG. It is an enlarged view in the middle of the action | operation of the pump apparatus of FIG. It is a partially notched side view of the pump apparatus which concerns on 2nd Embodiment of this invention. It is a modification of the pump apparatus of FIG. It is a principal part enlarged view of the pump apparatus which concerns on 3rd Embodiment of this invention.

  1 to 4 show a pump device according to a first embodiment of the present invention. As shown in FIG. 1, the pump device is formed by a pump cylinder 2, a mounting member 22, a poppet valve body 30, an operating member 40, and a retaining cylinder 80. Each of these members can be molded from a synthetic resin unless otherwise specified.

  The pump cylinder 2 is formed by a pump cylinder body 4 and a suction pipe 20.

  In the illustrated example, the pump cylinder body 4 has a flange 8 on the upper portion of the peripheral wall 6 having a small diameter at the lower end, and the inner surface of the lower end portion of the peripheral wall 6 is formed on the first valve seat 10 and is integrally formed from the outer surface of the lower end portion. The fitting cylinder 12 is suspended. The upper part of the suction pipe 20 is fitted to the fitting cylinder 12. A plurality of locking ribs 14 having upward stepped portions 16 project inward from the lower inner surface of the peripheral wall 6 at intervals in the circumferential direction. A packing 18 is attached to the lower surface of the flange 8.

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

  The poppet valve body 30 is a rod-shaped member shown in FIG. 2 (A). The poppet valve body 30 projects fins 32 laterally outward from the lower outer surface, and forms at least one communication recess 34 on the upper outer surface. For convenience of explanation, the communication recess 34 will be described later. The poppet valve body 30 in the illustrated example has a large diameter at the bottom.

The poppet valve body 30 extends upward from the lower part of the pump cylinder body 4 and is vertically supported by a seal part described later so as to be lifted and lowered. In this supported state, the lower end portion of the poppet valve body 30 faces the first valve seat 10, and the suction valve V ₁ is formed by the lower end portion and the first valve seat 10. The fins 32 of the poppet valve body 30 are inserted into the gaps between the locking ribs 14.

  The operating member 40 includes a seal cylinder 42, a stem 54, a cylindrical piston 60, and a nozzle head 70.

  The seal cylinder 42 includes a communication hole 46 that opens in an intermediate portion in the vertical direction of the cylinder wall 44, an annular seal portion 48 attached to the lower inner surface of the cylinder wall 44, and a bowl-shaped protrusion that protrudes from the lower outer surface of the cylinder wall 44. And a second valve seat 50. A coil spring 52 is interposed between the second valve seat 50 and the upward step portion 16 of the locking rib 14. The seal portion 48 is in contact with the outer peripheral surface of the poppet valve body 30 in a vertical direction with a constant contact allowance.

  The stem 54 is fitted to the upper part of the cylinder wall of the seal cylinder 42 and stands up above the pump cylinder 2. In the illustrated example, the lower portion 54a of the stem 54 is a large diameter portion.

In the illustrated example, the cylindrical piston 60 has a double cylindrical shape including an inner cylindrical portion 62 and an outer cylindrical portion 64, and is continuous at each intermediate portion in the vertical direction between the inner cylindrical portion 62 and the outer cylindrical portion 64. The upper and lower parts of the outer cylinder part 64 are slidably fitted to the inner surface of the pump cylinder body 4 as skirt-like parts having a large tip. The lower part of the inner cylinder part 62 is formed so as to be seated on the second valve seat 50, and the lower part of the inner cylinder part 62 and the second valve seat 50 form a suction valve V ₂ . Further, the upper part of the inner cylinder part 62 is liquid-tightly and slidably fitted to the inner surface of the lower part 54a of the stem 54.

  The nozzle head 70 is attached to the upper portion 54b of the stem 54. In the illustrated example, an inner peripheral wall 72 and an outer peripheral wall 74 are suspended from the outer peripheral portion of the top wall of the nozzle head 70, respectively. However, such a structure can be changed as appropriate. The inner peripheral wall 72 is fitted to the upper portion 54b of the stem 54 with a certain gap from the top wall. From the upper part of the inner peripheral wall 72, the nozzle 76 projects forward through the upper part of the outer peripheral wall 74.

  The retaining cylinder 80 is fitted to the upper part of the inner surface of the pump cylinder 2, and is provided so as to be in contact with the cylindrical piston 60 to prevent the retaining cylinder 80 from coming off.

In the present invention, on the outer peripheral surface of the poppet valve body 30, a communication recess 34 that is longer than the contact allowance of the seal portion 48 is formed. Thereby, thereby communicating the flow path portion P ₁ and the sealing portion downstream of the flow path portion P ₃ of the seal portion upstream at least one stage of the suction process. This is because the back suction effect also acts during the suction process.

The shape of the communication recess 34 is preferably formed in a shallow vertical groove as shown in FIG. This is because the back suction effect can be maintained for a long time. In the illustrated example, although smaller than the gap between the valve body and the first valve seat 10 of the suction valve V ₁ indicating the depth of longitudinal grooves in FIG. 3 (A), its depth can be selected as appropriate. The width and length of the longitudinal grooves and the number of longitudinal grooves may be appropriately determined according to the required size of the backpack.

  The amount of liquid sucked by back sucking can be equal to or more than the inner volume of the nozzle 76. By doing in this way, the merit that liquid dripping from nozzle 76 can be prevented certainly is acquired. This will be described later.

The locations for forming the communication recess 34, rest position shown in FIG. 1 from the position the seal portion 48 is shown in FIG. 3 (C) (position at which the discharge valve V ₂ is closed) (actuating member 40 is in position Within the range of travel to the position where It is not necessary to provide the communication recess 34 so as to correspond to the entire range of the stroke. In the illustrated example, the distance from the upper end of the communication recess 34 to the seal portion 48 in FIG. 1 is made larger than the vertical length of the communication recess 34.

In the above configuration, the pump of the present invention mounted on the mouth-neck portion of the container body, depressing the nozzle head 70, the seal portion 42 is lowered to open the discharge valve V ₂ with respect to the cylindrical piston 60 and tubular sealing 42 together with the poppet valve body 30 descends inlet valve V ₁ is closed (see Figure 3 (A)). As a result, the pump chamber A formed by the flow path portion in the space between the suction valve V ₁ and the discharge valve V ₂ passes through the intermediate flow path portion P ₂ between the second valve seat 50 and the pump cylinder 2, It is discharged out of the nozzle 76 through the stem 54.

When release of the nozzle head 70 is released, the seal cylinder 42 is pushed up by the coil spring 52, and the poppet valve body 30 is also pulled up by friction with the seal portion 48. This allows the suction valve _{V 1} is open. The poppet valve body 30 stops rising when the fin 32 comes into contact with the lower end of the coil spring 52 (see FIG. 3B). At the stage from FIG. 3A to FIG. 3B, the stem 54 rises together with the seal cylinder 42, while the cylindrical piston 60 does not rise, so the upper end of the inner cylinder portion 62 of the cylindrical piston 60 and the stem the distance between the upper end of the lower 54a changes from X ₁ to X _2, first back sack Deployment effect occurs in response to a change in this distance.

The seal cylinder 42 rises even after the poppet valve body 30 is stationary, and the second valve seat 50 of the seal cylinder 42 abuts against the lower end of the inner cylinder portion 62 of the cylindrical piston 60. Thereby the discharge valve _{V 2} is closed (see FIG. 3 (C)). In this case the distance between the upper end of the lower 54a of the upper end and the stem of the inner cylindrical portion 62 is changed from X ₂ to X _3, back sacks Deployment occurs in accordance with a change in this distance. In the process from FIG. 3 (A) to FIG. 3 (C), the sealing performance between the seal portion 48 and the poppet valve body 30 is ensured.

Seal tube 42 also rises after closure of the discharge valve V _2, the pump chamber A is negative pressure liquid through the suction pipe 20 is sucked into the pump chamber A. Further, when the sealing portion 48 is located between the upper and lower ends of the communication recess 34, and the flow path portion P ₁ of the flow path portion P ₃ and the seal portion upstream of the sealing portion downstream communicates via an internal communication recess 34 Therefore, a back suction effect is produced, and the liquid is sucked back from the nozzle side (see FIG. 4). Further, when the seal cylinder 42 moves upward from the upper end position (FIG. 3D) of the communication recess 34, the back suction is stopped and a normal suction process is performed.

  Other embodiments of the present invention will be described below. 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.

5 and 6 show a second embodiment of the present invention. In the present embodiment, the channel width D _U upstream the narrowest portion S _U of the seal portion upstream of the flow path portion P _1, the flow path on the downstream side the narrowest portion S _L of the seal portion downstream of the flow path portion P ₃ it is obtained by narrower than the channel width of the width D _L. Since thereby the flow path resistance of the seal portion downstream of the flow path portion P ₃ is reduced as compared to the flow path portion P ₁ of the seal portion upstream, back it sucks Deployment effect increases.

In the illustrated example, the upstream-side top stenosis S _U and the first valve seat 10 pump cylinder portion of the lower, and although the downstream outermost stenosis S _L is set to the nozzle 76, but is not limited thereto. When there is a narrow space than the nozzle 76 inside the stem 54 as shown in FIG. 1 embodiment for example, the location and the downstream outermost stenosis S _L, the flow path of the upstream-side top stenosis S _U than its channel width Design to be wide.

Figure 6 is a modification of FIG. 5, fitted with tubular adapter 21 for passage reduced to lower inner surface of the suction pipe, and the inside of the cylindrical adapter 21 and downstream the narrowest portion S _L. Thus it is possible to increase the back sack Deployment effect by providing a jig to increase the flow resistance in the upstream flow path portion P _1.

  FIG. 7 shows a main part of a pump device according to the third embodiment of the present invention. In the present embodiment, the upper portion 54b of the stem 54 has a straight cylindrical shape with a top, and the top plate 58 of the stem 54 is abutted against the back surface of the top wall of the nozzle head 70. A through hole 56 for communicating with the base of the nozzle 76 is opened on the front side of the upper portion 54b of the stem 54.

  An alignment means 78 is formed at a corresponding position between the inner peripheral wall 72 and the stem 54 so that the through hole 56 is engaged with the nozzle 76 in a state where the through hole 56 communicates with the nozzle 76. The alignment means 78 in the illustrated example is formed by a notch drilled in the inner peripheral wall and a convex portion provided in the stem 54, but the structure can be changed as appropriate.

  In the present embodiment, it is desirable to set the vertical length of the communication recess 34 so that the amount of liquid sucked by back suction is larger than the internal volume of the nozzle 76.

  In the present embodiment, it is desirable that all the liquid filled in the nozzle 76 can be sucked to the stem 54 side. This is because the room for selecting the material for the nozzle head 70 and the stem 54 is expanded. For example, the nozzle head 70 can be made of a relatively soft material such as polypropylene (PP) or polyethylene (PE). This facilitates the removal of the nozzle head 70 from the mold. Further, the stem 54 can be formed of a material that is relatively hard and has a small volume swelling ratio with respect to the oil component. Examples thereof include polyoxymethylene (POM) and polybutylene terephthalate (PBT).

  Usually, when such a combination of materials is used, since the swelling amount of the nozzle head 70 in the vicinity of the nozzle 76 is larger than that of the stem, there is a possibility that a dimensional deviation occurs at the fitting portion and liquid leakage occurs. However, in the configuration of the present embodiment, all the content liquid is sucked from the nozzle 76 to the stem 54 side, so that such a problem does not occur. Furthermore, adsorption of contents can be prevented.

2 ... Pump cylinder 4 ... Pump cylinder body 6 ... Surround wall 8 ... Hut
10 ... First valve seat 12 ... Fitting cylinder 14 ... Locking rib 16 ... Upward stepped portion 18 ... Packing
20 ... Suction pipe 21 ... Adapter
22 ... Installation member 24 ... Installation cylinder 26 ... Inward flange 28 ... Protection cylinder
30 ... Poppet valve body 32 ... Fin 34 ... Communication recess
40 ... Actuating member 42 ... Seal tube 44 ... Tube wall 46 ... Communication hole 48 ... Seal part
50 ... Second valve seat 54 ... Stem 54a ... Stem lower part 54b ... Stem upper part
56 ... Through hole 58 ... Top plate
60 ... Cylindrical piston 62 ... Inner cylinder part 64 ... Outer cylinder part
70 ... Nozzle head 72 ... Inner peripheral wall 74 ... Outer peripheral wall 76 ... Nozzle 80 ... Retaining cylinder A ... Pump chamber P ... Liquid flow path P ₁ ... Seal upper flow path part P ₂ ... Intermediate flow path part P ₃ ... Seal lower flow Road part V ₁ ... Suction valve V ₂ ... Discharge valve

Claims (4)

A pump cylinder (2) having a first valve seat (10) for the suction valve (V ₁ ) at the bottom;
A poppet valve body (30) that extends upward from the first valve seat (10) and is movable up and down within a certain range;
An operating member (40) standing up from the pump cylinder (2),
This actuating member (40)
An annular seal part (48) that is urged upward and contacts the poppet valve body (30) is provided on the inner surface of the lower part of the cylinder wall, and a second valve seat (50) is provided on the outer surface of the lower part of the cylinder wall. A seal cylinder (42) having a hole (46);
A stem (54) fitted to the upper part of the cylinder wall of the seal cylinder (42) and standing upward;
A cylindrical piston (60) loosely inserted between the stem (54) and the second valve seat (50) and fitted to the inner surface of the pump cylinder (2);
A nozzle head (70) attached to the upper part (54b) of the stem (54),
When the nozzle head (70) is pushed down, the seal cylinder (42) and the poppet valve body (30) are lowered, the discharge valve (V ₂ ) is opened and the suction valve (V ₁ ) is closed, and the seal cylinder ( 42) by raising the poppet valve body (30) to the suction valve open state and the cylindrical piston (60) to the discharge valve closed state, and the cylindrical piston (60) and the seal cylinder (42 In the pump device that performs suction and discharge of the liquid through the third process in which
On the outer surface of the poppet valve body (30), there is provided a communication recess (34) for communicating the flow path portion (P ₁ ) upstream of the seal portion and the flow path portion (P ₃ ) downstream of the seal portion in the third process ,
Of the channel portion (P ₁ ) upstream of the seal portion, the channel width (D _U ) of the upstream narrowest portion (S _U ) having the smallest channel area is the channel portion (P ₃ ) downstream of the seal portion. A pump device, characterized in that it is smaller than the flow path width (D _L ) of the downstream most narrowed portion (S _L ) having the smallest flow path area . The pump device according to claim 1, wherein the communication recess (34) is formed in a vertical groove. With hanging the suction pipe (20) from the suction valve (V ₁₎ side of the pump cylinder (2), and characterized in that fitted a tubular adapter for inner diameter adjustment (21) to the lower end portion inner surface The pump device according to claim 1 or 2 . The upper part (54b) of the stem (54) has a cylindrical shape, and a through hole (56) communicating with the base of the nozzle (76) of the nozzle head (70) is opened on one side of the top part. The pump device according to any one of claims 1 to 3 , wherein an inner peripheral surface of an upper portion (54b) of the stem (54) excluding the opening portion is suspended.