JP4381689B2 - Liquid jet pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid jet pump, and more particularly, a liquid capable of preventing introduction of outside air for eliminating negative pressure of a container body into a discharge liquid when reciprocating in a cylinder of a piston. It relates to a jet pump.
[0002]
[Prior art]
As a liquid ejection pump, there is known a so-called piston pump type that performs water absorption and discharge by reciprocating movement of a piston in a cylinder, for example, a cylinder provided with a suction valve in a lower end portion suspended in a container body, A stem provided with an annular piston fitted in the cylinder protruding from the lower part of the outer periphery so as to be movable up and down in an upward biased state, and a nozzle fitted to the upper end of the stem and provided above the mounting cap so as to be movable up and down And a discharge valve provided in the upper part of the stem, and by vertically moving a vertically moving member composed of a piston, a stem and a pressing head, the liquid in the container is moved into the cylinder through the suction valve. It is known that it is configured to suck up and discharge the liquid in the cylinder from the nozzle through the discharge valve from the nozzle. (For example, refer to Patent Document 1).
[0003]
Further, in these pumps, an outside air introduction hole is provided in the cylinder in order to introduce outside air into the container body when the liquid is reduced due to ejection. Further, the annular piston is provided with an annular recess at its outer peripheral intermediate portion, and is configured so that the seal portions on both sides of the recess are slidably fitted to the inner periphery of the cylinder. Further, the piston before compression is positioned in a state where the outside air introduction hole is blocked by the respective seal portions, and is configured to communicate with the outside after returning from the compression state.
[0004]
FIG. 5 shows an example of this type of pump , which is different from the above-described conventional example, and shows an example in which the piston 6A is configured to move up and down relatively with respect to the stem 20A. A pair of seal portions 7A and 8A are fitted on both sides of 5A. When the stem 20A is pushed down from this state, the piston 6A rises relative to the stem 20A, and the discharge valve 30A opens to open the cylinder 2A. The liquid inside is ejected through the stem 20A.
[0005]
[Patent Document 1]
JP-A-8-164964 (page 2-5, FIG. 1)
[0006]
[Problems to be solved by the invention]
The piston 6A requires that the sealing portions 7A and 8A maintain a good hermetic seal with the inner surface of the cylinder 2A. For this reason, it is necessary to use a material that is relatively rigid. However, if a material with high rigidity is selected, the seal portion is likely to be caught on the inner surface of the cylinder 2A during sliding, and the operation of the stem 20A may be awkward. Therefore, conventionally, the piston is often made of a relatively soft material, for example, rubber or soft synthetic resin, with emphasis on operability.
[0007]
In that case, the seal part may be deformed and air may be mixed into the cylinder 2A. That is, after compression in the cylinder 2A by the piston 6A, when the piston 6A is restored to its original position, the inside of the cylinder 2A becomes negative pressure, and as a result, the air inside or outside the container body 3A deforms the seal portion 8A on the compression direction side. May be mixed into the cylinder 2. This tendency is more conspicuous when the viscosity of the jet liquid is high or when the diameter of the suction pipe to be used is small, that is, when the suction port diameter is relatively small with respect to the cylinder inner diameter. Inconveniences such as a decrease in the amount of discharge at one time are caused by mixing of air into the cylinder 2A.
[0008]
The present invention has been made in view of the above points, and more reliably prevents air from being mixed into the cylinder despite the fact that the piston is made of a relatively soft material and has smooth operability. We propose a liquid jet pump that can do this.
[0009]
The first means is configured as follows. That is, the cylinder 2 provided with the outside air introduction hole 5 for introducing outside air into the container body in accordance with the negative pressure in the attached container body 3, and the annular first seal portion 7 sandwiching the outside air introduction hole 5. And a piston 6 in which the second seal portion 8 is slidably fitted to the inner peripheral surface of the cylinder 2, the second seal portion 8 on the compression direction side among the seal portions. A double seal structure was adopted.
It was.
[0010]
The second means is configured as follows. That is, in the first means, the first seal portion 7 and the second seal portion 8 are formed in a skirt shape projecting from the annular base portion 9 and expanding from each other, and the second seal portion 8. However, the front end portions of the first seal portion 7 and the second seal portion 8 are integrally formed in a skirt shape that expands from each other .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
The liquid jet pump 1 according to the present invention is in the form of a so-called piston pump that performs water absorption and discharge by reciprocating movement of a piston in a cylinder. Specifically, the liquid jet pump 1 in the form of a vertical pump as shown in FIG. The thing of the trigger type pump form as shown in 4 etc. are mentioned.
[0013]
In the present invention, a cylinder provided with an outside air introduction hole for introducing outside air into the container body in accordance with the negative pressure in the attached container body, and an annular first seal portion and second seal sandwiching the outside air introduction hole. And a piston in which the portion is slidably fitted to the inner circumferential surface of the cylinder, and the second seal portion on the compression direction side among the seal portions has a plurality of seal structures.
[0014]
Various forms can be adopted as the cylinder as long as it is used in a piston pump that ejects a conventional liquid. For example, as shown in FIG. 1, the cylinder 2 is fixed to the container body mouth portion 4 with its lower end hanging down into the container body 3, or fixed laterally above the container body 3 as shown in FIG. The thing etc. are mentioned, It is not limited to these.
[0015]
The outside air introduction hole is provided for the purpose of preventing the inside of the container equipped with the pump from becoming negative pressure due to the ejection of the liquid, and is formed in a cylinder to connect the inside of the container and the outside. In addition, the piston is normally closed by the piston so as to prevent leakage of the liquid therefrom. As a specific method, the annular first seal portion 7 and the second seal portion 8 of the piston 6 are slidably fitted to the inner peripheral surface of the cylinder 2 with the outside air introduction hole 5 interposed therebetween as shown in the figure. When the piston is operated and moved in the compression direction, the outside air introduction hole 5 is opened so that the inside of the container body 3 communicates with the outside.
[0016]
In the present invention, as described above, the second seal portion 8 on the compression direction side of each seal portion has a plurality of seal structures. This multiple seal structure means that there are a plurality of annular sliding portions that slide on the inner peripheral surface of the cylinder 2, and as shown in an enlarged view in FIG. 2, a second main seal portion 8a and a second auxiliary seal portion. The double seal structure with 8b may be provided, or three or more annular sliding portions may be provided. However, when the number of sliding portions increases, there may be a disadvantage such as poor slidability. The heavy seal structure is efficient in achieving the intended purpose.
[0017]
In addition, various shapes can be adopted as a specific structure of a plurality of seal structures as long as the above requirements are satisfied, but the embodiment shown in FIG. 1 and FIG. As described above, it is possible to preferably employ a skirt-like configuration in which the tip portions are expanded to each other. At this time, the first seal portion 7 and the second seal portion 8 are preferably formed in a skirt-like shape that projects from the annular base portion 9 and expands from each other as shown in the drawing. The piston 6 having such a structure can be made of a flexible material so as to obtain good slidability, and sufficient airtightness can be obtained by the above-described structure. Although it can form with materials, such as resin, it is not restricted to this.
[0018]
FIG. 1 shows an embodiment, and a liquid jet pump 1 includes a mounting cap 10, the cylinder 2, and a vertical movement member 11.
[0019]
The mounting cap 10 fixes the cylinder 2 to the container body 3, and has an inward flange-shaped top wall extending from the upper end edge of the peripheral wall screwed to the outer periphery of the container body opening 4.
[0020]
The cylinder 2 is fixed to the container body 3 by the mounting cap 10 and the lower end portion is suspended in the container body. In the illustrated example, the cylinder 2 has an outward flange 14 projecting from the upper outer periphery, and has a valve hole with a valve seat at the center of the lower end, and a suction valve with a poppet valve body 15 that opens and closes the valve hole. 16 is formed. The poppet valve body 15 is fitted with a lower end of the inner periphery of the stem, which will be described later, so that its upper end is liquid-tight and slidable. When the stem is lowered, the lower surface of the stem is lowered to a position closing the valve hole, and then only the stem is lowered. Further, a fitting cylinder portion 17 is suspended below the suction valve 16, and the upper end of a suction pipe (not shown) is fitted, and the lower portion is suspended below the container body.
[0021]
A cylindrical member 18 for locking the vertical movement member 11 is fitted on the inner peripheral upper portion of the cylinder 2, and the lower surface thereof is configured as a downward stepped portion 19. Further, the outside air introduction hole 5 is formed in the cylinder 2 immediately below the downward step portion 19. Then, the outward flange 14 is placed on the upper surface of the container body mouth portion 4 via packing, and the mounting cap 10 is screwed to the outer periphery of the mouth portion 4 so that the top wall and the upper surface of the container body mouth portion 4 are outside. The orientation flange 14 is sandwiched.
[0022]
The vertically moving member 11 has the above-mentioned piston 6 slidably fitted to the inner periphery of the cylinder 2 slidably connected to the lower outer periphery of the stem 20 so as to be movable up and down with the stem 20 and protrudes upward of the cylinder. A push-down head 22 with a jet port 21 is fitted to the upper end of the stem, and is provided so that it can be pushed down in an upward biased state.
[0023]
In this embodiment, the stem 20 has an inner cylinder 20a with a flange 23 projecting outward from the outer peripheral lower portion, a lower end portion positioned at a predetermined distance from the flange 23, and a plurality of ribs 24 in the circumferential direction. And an outer cylinder 20b having an upper end projecting upward from the inner cylinder 20a. And it is comprised so that the piston 6 may be fitted between the said flange 23 and the outer cylinder 20b lower end so that a vertical movement is possible. Then, a liquid flow path is formed which communicates with the inside of the outer cylinder 20b of the inner cylinder 20a through the gap a from the opening between the flange 23 and the lower end of the outer cylinder 20b. It is configured to communicate between the inside and outside.
[0024]
Also, the upper end of the poppet valve body 15 is inserted into the lower end opening of the inner cylinder 20a, and the seal protrusion 25 projecting from the lower end of the inner periphery is liquid-tight and slidable on the outer periphery of the poppet valve body 15. It is fitted. Further, a plurality of circumferential locking ribs project from the bottom surface of the vertical wall portion suspended from the bottom surface of the flange 23, and between the locking ribs and a plurality of circumferential circumferential projecting ribs on the lower inner periphery of the cylinder. The stem 20 is always urged upward through the coil spring 26.
[0025]
The piston 6 protrudes from the outer peripheral surface of the cylindrical base 9 with a first seal portion 7 having a skirt shape, and protrudes from the outer peripheral surface of the base portion 9 with a second seal portion 8 having a skirt shape. The tip end portion of the second seal portion 8 is divided into two portions, and a skirt-like second main seal portion 8a is projected downward, and a second skirt-like second auxiliary seal portion 8b is projected upward. Further, a cylindrical third seal portion 27 is provided projecting upward from the inner peripheral surface of the base portion 9, and an annular fourth seal portion 28 is provided projecting downward from the inner peripheral surface of the base portion 9.
[0026]
The base portion 9 is loosely fitted between the lower end of the outer cylinder 20b and the flange 23 so as to be movable up and down, and the tip end portion of the first seal portion 7 is placed on the inner peripheral surface of the cylinder 2 above the outside air introduction hole 5. The distal ends of the second main seal portion 8a and the second auxiliary seal portion 8b are slidably fitted to the inner peripheral surface of the cylinder 2 below the outside air introduction hole 5, and the distal end of the third seal portion 27 is also fitted. Slidably fitted to the lower end portion of the inner peripheral surface of the outer cylinder 20b, and the fourth seal portion 28 is engaged with the inner peripheral surface of an annular seal ridge 29 standing on the upper surface of the flange 23. The piston 6 is attached to the stem 20. Further, the discharge valve 30 is formed by the fourth seal portion 28 and the seal protrusion 29.
[0027]
The push-down head 22 has a cylindrical casing with a lower end opening that has a peripheral wall extending from the periphery of the top wall. It is attached and fixed to the stem 20. In addition, a horizontal cylinder having an open base end on the upper front surface of the vertical cylinder 31 passes through the casing peripheral wall and protrudes forward. The horizontal cylinder is configured as a nozzle 32, and an outlet 21 is opened at the tip thereof. .
[0028]
In the liquid jet pump 1 configured as described above, the vertical movement member 11 is normally at the highest position by the elastic force of the coil spring 26, and the outside air introduction hole 5 is blocked by the piston 6. When the vertical movement member 11 is pushed down from this state, the piston 6 rises relative to the stem 20 as shown in FIG. 3, and the engagement between the seal protrusion 25 and the fourth seal portion 28 is released, that is, the discharge valve. 30 opens to allow the inside of the cylinder 2 and the stem 20 to communicate with each other, and the compressed liquid in the cylinder 2 is introduced into the stem 20. At this time, the outside air introduction hole 5 is opened and the inside of the container body 3 communicates with the outside.
[0029]
On the other hand, when the vertically moving member 11 rises from the state shown in FIG. 3, the piston 6 descends relative to the stem 20, the discharge valve 30 closes, the inside of the cylinder 2 becomes negative pressure, and the suction valve 16 opens accordingly. The liquid in the container body 3 is sucked into the cylinder 2. At this time, outside air is introduced from between the stem 20 and the cylindrical member 18 into the container body which has been made negative pressure through the outside air introduction hole 5. At the highest position of the vertical movement member 11, the upper end edge of the first seal portion 7 of the piston 6 is brought into contact with and locked to the lower surface of the downward step portion 19.
[0030]
FIG. 4 shows an embodiment showing a trigger type pump. In this embodiment, the main body 33 is fixed on the container body 3 by a mounting cap 10 fitted to the mouth 4. The main body 33 has a vertical cylinder 34 having an open lower end, and communicates with the inside of the vertical cylinder 34 in front of the vertical cylinder 34 so as to project the cylinder 2 and communicate with the inside of the vertical cylinder 34 from above the vertical cylinder 34. The injection cylinder 35 protrudes forward. Further, an ejection nozzle 36 having an opening 21 is fitted at the tip of the injection cylinder 35, the upper end of the suction pipe 37 is fitted at the lower end of the vertical cylinder 34, and the suction is introduced into the lower part of the vertical cylinder 34. A valve 16 is provided, and a discharge valve 30 is provided at the top. The piston 6 is provided so that it can be pushed into the cylinder 2 in a forward-biased state, and the piston 6 can be pushed by a trigger 38 pivotally attached to the injection cylinder 35. In the present embodiment, the cover portion that contacts the trigger 38 of the piston 6 is formed of a relatively rigid material, and the portion that slides with the cylinder is formed of the flexible material. Further, the outside air introduction hole 5 opened to the cylinder 2 is configured to communicate with the inside of the container body 3 through the ventilation path b.
[0031]
In each of the above embodiments, each member may be formed of a synthetic resin unless otherwise specified, but is not particularly limited.
[0032]
【The invention's effect】
As described above, the liquid jet pump of the present invention has the above-described configuration, and can smoothly slide the piston and more reliably prevent the introduced outside air from being mixed into the jet liquid. As a result, inconveniences such as a change in the amount of the ejected liquid are prevented. In particular, even when a highly viscous liquid is used as the ejected liquid, or even when the suction port diameter of the cylinder is smaller than the inner diameter of the cylinder, smooth piston sliding performance and sealing performance can be obtained. It is.
[0033]
Further, the liquid jet pump of the second means has a smoother slidability and a sealing property.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the pump of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the same embodiment.
FIG. 3 is an enlarged cross-sectional view of a main part in a state where the piston of the embodiment is pushed down.
FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention.
FIG. 5 is an enlarged sectional view of an essential part showing an example of a conventional pump.
[Explanation of symbols]
2 ... Cylinder, 3 ... Container body, 5 ... Outside air introduction hole, 6 ... Piston,
7 ... 1st seal part, 8 ... 2nd seal part, 9 ... Annular base

Claims (1)

A cylinder 2 provided with an outside air introduction hole 5 for introducing outside air into the inside of the container body in accordance with the negative pressure in the attached container body 3, an annular first seal portion 7 and a first seal portion sandwiching the outside air introduction hole 5. In a liquid jet pump having a piston 6 in which a two-seal portion 8 is slidably fitted to the inner peripheral surface of a cylinder 2, the second seal portion 8 on the compression direction side of each of the seal portions is doubled. The seal structure is such that the first seal portion 7 and the second seal portion 8 have a skirt shape that projects from the annular base portion 9 and expands from each other. A liquid jet pump characterized in that each of the first seal portion 7 and the second seal portion 8 is formed integrally with each other in a skirt shape that expands into a skirt shape.

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