JP2002224601A - Push down head for vertical pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the defect that a push-down head for a vertical pump with a valve rod for automatically opening and closing a nozzle hole becomes heavy in its push-down operation. SOLUTION: In the push-down head 21 constituted so that the inside of the upper part of the push-down head 21 engaged with the upper end part of a stem 6 is formed as a small cylinder 22 horizontally provided in the front and back direction, a 2nd discharge valve 25 is formed from the front end of the valve rod 24 pressed forward into and engaged with the small cylinder and the nozzle hole 23 on the front wall of the small cylinder and is opened and closed when the push-down head 21 ascends and descends to move the valve rod forward and backward, the push-down head 21 is engaged with the stem 6 to be movable vertically to the stem 6 with a small stroke, the stem 6 upper part is inserted into an inserting through hole 29 of the small cylinder bottom wall 22a to surround the inserting through hole and a 2nd cylindrical piston 31 engaged with the stem upper part to enable to slide is engaged with the inside of a small auxiliary cylinder 30 communicating with the small cylinder 22 and hanging down and enables to descend by highly pressurizing the inside of the auxiliary cylinder with the descending of the push-down head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing head of a vertical pump.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Patent Application Laid-Open No. 9-155254,
A small cylinder is formed in the upper part of the press-down head of the vertical pump, a nozzle hole is formed in the front wall of the small cylinder, and a piston having a front end as a valve body is biased forward and fitted into the small cylinder. When the push-down head is lowered by connecting the inside of the operating member stem that rises from the inside of the large cylinder of the vertical pump to the inside of the small cylinder and dropping the engaging plate with the cam from the rear of the piston, Causes the valve body to open the nozzle hole by retracting the piston, and then the high-pressure liquid in the large cylinder passes through the stem of the operating member, and also squirts from the nozzle hole through the small cylinder to push down the press-down head. It is known that when released, a push-down head as an upper end of an actuating member rises and a piston advances to close a nozzle hole.

[0003]

When the operating member is lifted after the liquid is ejected by the pressing of the operating member, the conventional pressing head moves the liquid into the large cylinder, the stem, and the small cylinder of the pressing head of the vertical pump. Therefore, there is a drawback that a force is required when the press-down head is pressed down again, and it is difficult to press down.

The present invention is provided so that the pressing can be easily performed.

[0005]

As a first means, there is provided a nozzle having a nozzle hole which is fitted to the upper end of an operating member stem 6 which is urged upward from a large cylinder 4 of a vertical pump so as to be able to rise instantaneously and rises. A press-down head 21, a small cylinder 22 laterally provided in the front-rear direction in the upper portion of the press-down head, and a front end of a valve stem 24 fitted into the small cylinder by urging forward; The second discharge valve 25 is formed by the nozzle hole 23 drilled in the front wall of the small cylinder, and the valve stem is pushed down by the pushing down of the pushing down head.
In a push-down head having a motion changing mechanism for retracting the second discharge valve 25 by retreating against the bias, the push-down head 21 is fitted to the stem 6 so as to be able to move up and down by a small stroke. A small auxiliary cylinder communicating with the inside of the small cylinder from the small cylinder bottom wall 22a by penetrating the small cylinder bottom wall 22a to form an insertion through hole 29 into which the upper part of the stem is inserted.
The second cylindrical piston 31 which is vertically urged upward and weaker than the urging force of the operating member to the upper outer surface of the stem into the small auxiliary cylinder, and is vertically movably fitted into the small auxiliary cylinder. The second cylindrical piston 31 is formed so as to be able to descend by the high pressure in the small cylinder and the small auxiliary cylinder when the press-down head with respect to the stem 6 is lowered.

[0006] As a second means, the above-mentioned first means is provided, and a valve stem portion above the stem is made a small outer diameter portion.
The front surface of the large-diameter portion 37 formed by the rear portion of the valve stem is formed on the tapered cam surface 38 of the front small diameter, and the rear surface of the upper surface of the stem 6 is brought into contact with the lower surface of the tapered cam surface. The lower part of the stem slides upward along the tapered cam surface 38 and protrudes into the small cylinder, so that the valve rod 24 does not have a motion changing mechanism for retreating, and is depressed from the depressed position. By pulling out the upper part of the stem from the inside of the small cylinder 22 due to the rise of the head, the inside of the small cylinder is made negative pressure and the outside air can be sucked in through the nozzle hole 23. As a third means, the small cylinder having the first or the second means is provided.
The rear surface of the valve 22 was sealed, and a small gap was formed between the outer peripheral surface of the valve stem 24 and the inner wall surface of the small cylinder.

As a fourth means, there is provided the above-mentioned third means, and a rear large outside diameter portion 37 of the valve stem is formed in a first cylinder portion 45 which is closed at the front and opened at the rear surface. The second cylindrical portion 46 which is fitted to the inner surface in a watertight manner and the first cylindrical portion is freely slidable.
Is projected from the front surface of the rear wall of the small cylinder, and a third coil spring 43 for urging the valve rod is interposed between the rear surface and the front surface of the two cylindrical portions.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment shown in FIGS.
Describing an embodiment, reference numeral 1 indicates an entire vertical pump. Since the pump is well known and will be briefly described, a large cylinder 4 is hung from the inside of a mounting member 3 having a mounting cylinder 2 for fitting to the outer surface of the neck of the container body, and from inside the cylinder,
An actuating member 7 comprising a first cylindrical piston 5, a stem 6 having the piston at the lower end, and a pressing head 21 fitted to the upper end of the stem is instantaneously moved by a first coil spring 8 provided in the cylinder. The operating member is erected by being upwardly urged upward, and the vertical movement of the operating member sucks the liquid in the container into the large cylinder via the suction valve 9 provided in the lower end of the large cylinder, and is provided in the lower or upper part of the stem. Through the first discharge valve 10, the nozzle can be ejected from a nozzle hole formed in the upper front surface of the pressing head. The engaging cylinder 11 is erected from the outer periphery of the upper surface of the mounting member 3 and the lower part of the peripheral wall 27 of the press-down head is slidably fitted into the engaging cylinder, and the inner surface of the upper end of the engaging cylinder and the outer surface of the lower end of the outer peripheral wall are fitted. The upper and lower engaging projections are engaged with each other to prevent the push-down head from being pulled out upward.

In the upper part of the pressing head 21, a small cylinder 22 is provided.
Are disposed laterally in the front-rear direction, and a valve body at the front end of a valve rod 24 fitted by slidably and forwardly biasing the inner surface of a nozzle hole 23 formed in the front wall of the small cylinder into the small cylinder. The second discharge valve 25 is closed so that the valve rod is automatically retracted when the pressing head is pushed down, so that the second discharge valve is releasably provided.

In the present invention, the pressing head 21 is provided with a top wall 26.
A small cylinder 22 having a nozzle hole 23 at the center of a front wall 28 is provided by suspending a peripheral wall 27 from the outer periphery and extending horizontally in the upper part of the peripheral wall in the front-rear direction. The small cylinder bottom wall 22a has a stem insertion through-hole 29 at the center in the front-rear direction, and the small through-hole 29 is formed so that the small auxiliary cylinder 30 hangs down from the small cylinder bottom wall.

A second cylindrical piston is inserted into the small auxiliary cylinder 30.
Fit 31. The cylindrical piston 31 is fitted on the outer surface of a small outer diameter portion 6b provided on the upper portion of the stem via an upwardly directed step portion 6a. The upper stepped portion is fitted to the inner surface of the concave groove 30a formed in the lower inner surface of the
The lower end and upper end of the second coil spring 34 fitted to the lower portion of the small outer diameter portion are engaged between 6a and the first downward step portion 33 provided on the inner surface of the intermediate portion of the cylindrical piston. It is biased upward. A second downward step is provided on the lower inner surface of the cylindrical piston.
As shown in FIG. 2, when the pressing head 21 is depressed, the lower surface of the outer peripheral portion of the second downward step portion 35 comes into contact with the outer peripheral portion of the upward step portion 6a of the stem. The upper surface of the second cylindrical piston 31 is in contact with the lower surface of the small cylinder bottom wall 22a, so that the push-down head 21 can push down the stem 6 via the second cylindrical piston 31.

The valve rod 24 is fitted into the small cylinder 22 by urging the valve rod 24 forward. The front end of the valve stem is tapered to have a small diameter and fitted into the nozzle hole 23 described above to form the second discharge valve 25. The middle and rear portions have a large outer diameter portion, and the space between them is small. As the outer diameter part, the middle large outer diameter part 36 is formed as an outward flange, and a plurality of cutouts are provided on the outer periphery thereof as a liquid flow path, and the rear large outer diameter part 37 has a front part having a small diameter tapered cam having a front part. A surface 38 is formed, and a concave portion 39 is formed in the rear surface. The outer diameter of each large outer diameter portion is smaller than the inner diameter of the small cylinder 22, and a plurality of passage forming grooves 40 are formed in the outer surface of the rear large outer diameter portion 37.

Into the rear end of the small cylinder 22, a rear end closing member 42 having a ring-shaped groove 41 on the front outer periphery is fitted in a watertight manner, and the rear end is fitted in the groove. The front end of the third coil spring 43 projecting forward is fitted into the recess 39 on the rear surface of the rear large outer diameter portion 37 to urge the valve stem 24 forward.

In the state shown in FIG. 1 in which the front end of the valve rod 24 closes the nozzle hole 23 by being urged forward by the third coil spring 43, the upper end of the stem 6 is located substantially flush with the inner surface of the small cylinder bottom wall 22a. At this time, the rear portion of the stem upper surface is located at the lower end of the tapered cam surface 38 on the front front surface of the valve stem, and the small outer diameter portion of the valve stem 24 formed between the valve stem intermediate portion and the rear portion is located above the stem. Is located.

When the vertical pump of FIG. 1 is mounted on the container body and the pressing head 21 is pressed down, as shown in FIG.
And the press-down head 21 descends with respect to the stem, whereby the tapered cam surface 38 on the rear front surface of the valve stem is pushed rearward at the rear portion of the stem upper surface, whereby the valve stem 24 retreats, and the second discharge valve 25
Opens. When the pressing head 21 is further pressed down from this state,
When the stem 6 is pushed down via the second cylindrical piston 31, the first discharge valve 10 is opened, and the liquid in the large cylinder passes through the stem 6 and the small cylinder 22 to form the nozzle hole.
Spouts from 23.

Next, when the press-down head 21 is released, the upward biasing of the operating member is provided so as to be able to instantly ascend, so that the operating member rises before the finger is released from the upper surface of the pressing head, and the operating member reaches the upper limit. Then, the finger can be released from the pressing head. Therefore, first, the first discharge valve 10 is closed and the first discharge valve 10 is closed.
The liquid is sucked into the large cylinder by raising the stem 6 with the cylindrical piston, and after the stem reaches the upper limit, the finger is separated from the pressing head, so that the pressing head 21 moves through the second cylindrical piston 31. As shown in FIG. 1, the valve stem 24 is pushed up by the second coil spring 34, and the upper portion of the stem 6 is pulled out of the small cylinder 22 by the pushing up, so that the valve stem 24 urged forward moves forward to the second discharge valve. Block 25.

When the upper portion of the stem is pulled out of the small cylinder 22, the internal volume of the small cylinder is expanded and a negative pressure is created, so that the outside air passes through the nozzle hole 23 into the small cylinder. It is sucked. Note that the valve stem 24 also advances at that time, and the internal volume of the small cylinder in front of the rear large outer diameter portion 37 of the valve stem is reduced. Since the inside diameter is large, the pressure inside the small cylinder does not increase due to the advance of the valve stem. Press down head again
When 21 is depressed, the depressing head first descends with respect to the stem 6. At this time, since the outside air flows into the small cylinder as described above, the outside air is first compressed and slightly descends. , Almost simultaneously, the rear end of the stem upper end surface is tapered cam surface
By pressing the valve 38, the valve rod 24 is retracted and the second discharge valve 25 is opened. At this time, the upper part of the stem 6 enters the small cylinder 22 to increase the pressure inside the small cylinder. As a result, the second cylindrical piston 31 descends as shown in FIG. Therefore, the pressing head 21 is the stem 6
, The stem 6 is pushed down after the pushing down head first descends before the stem pushing down.

FIGS. 4 to 6 show a second embodiment. First
The same parts as those in the embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only the different parts will be described. In this embodiment, each coil spring used in the vertical pump is a liquid for ejection of the vertical pump. The main difference from the first embodiment is that the structure does not wet.

For this purpose, an outward flange 12 is provided on a stem portion below the press-down head fitting portion, and a first coil spring 8 is provided between the lower surface of the flange and the upper surface of the mounting member 3. The operating member 7 is urged upward, and the valve stem 24
The third coil spring 43 for urging forward forms a first cylinder portion 45 having a large outside diameter portion at the rear end of the valve stem and a rear opening, and projects forward from the small cylinder rear wall into the first cylinder portion 45. The second cylindrical portion 46 is fitted watertightly and slidably with the first cylindrical portion, and is interposed between the first cylindrical portion and the second cylindrical portion. A small outer diameter engaging cylinder 47 is projected rearward from the front wall of the first cylindrical portion, that is, the center portion of the front wall rear surface of the valve stem rear large outer diameter portion, and the front portion of the third coil spring 43 is fitted. ing.

The second coil spring 34 for urging the upper part of the second cylindrical piston 31 has an inner surface of the second cylindrical piston located below a sliding contact surface in water-tight contact with an outer surface of the upper portion of the stem. There is no danger of getting wet, and therefore it may be the same as in the first embodiment.

In the case of the second embodiment, the second cylindrical piston 31 is provided so as to move up and down between the upper surface of the cylinder 12a rising from the outward flange 12 attached to the stem and the small cylinder bottom wall 22a. ing. The suction valve of the large cylinder 4 is formed by a poppet valve 13, and a lower end surface of the stem is opened, and a rod portion 14 rising from the poppet valve is fitted in a watertight and vertically movable manner into a lower portion thereof. . Such structures are also known.

The other parts are the same as in the first embodiment.
Therefore, the vertical pump of the second embodiment has the same operation as that of the first embodiment.

[0023]

According to the present invention, the above-described structure is adopted.
In the case of the description, at the time of pushing down of the pushing down head, the pushing down head rises behind the stem 6 and the upper part of the stem is pulled out from the inside of the small cylinder by the rise, so that the inside of the small cylinder is made into a negative pressure. The outside air is flowing in. Therefore, when the press-down head is pushed down, the air in the small cylinder is pressurized and when the inside of the small cylinder and the small auxiliary cylinder 30 is pressurized by the pressurization, the stem 6 descends. Prior to this, the second cylindrical piston 31 descends, so that it can be easily pushed down.

In the case of the second aspect, the valve stem portion above the stem has a small outer diameter, and the front surface of the rear portion of the valve stem has a tapered cam surface.
As 38, since the rear end of the stem presses the cam surface to the rear by lowering the push-down head to retract the valve stem and open the second discharge valve 25, the stem 6 separates the inside of the large cylinder and the inside of the small cylinder. In addition to functioning as a communicating passage pipe, valve stem 24
Can also be used as a function of pushing the rear part of the device, thereby simplifying the configuration.

In the case of the third aspect, since a small gap is provided between the outer peripheral surface of the valve stem and the inner wall surface of the small cylinder, the valve stem 24 slides without frictional resistance of the outer peripheral surface of the valve stem against the inner wall surface of the small cylinder. Easy.

In the case of the fourth aspect, the third coil spring 43 for urging the valve stem 24 forward does not touch the liquid that has entered the small cylinder, and there is no risk of rust or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vertical pump having a press head according to the present invention.

FIG. 2 is a cross-sectional view of the vertical pump shown in FIG. 1, showing a state where a pressing head is lowered with respect to a stem of the vertical pump.

FIG. 3 shows the press-down head slightly depressed,
1 is a sectional view of the vertical pump.

FIG. 4 is a cross-sectional view of a vertical pump to which a press-down head is fitted according to a second embodiment.

5 is a cross-sectional view of the vertical pump of FIG. 4, showing the press down head lowered relative to the stem.

FIG. 6 shows the push-down head in a slightly lowered state;
FIG. 4 is a sectional view of the vertical pump.

[Explanation of Signs] 6 ... Stem 7 ... Working member 21 ... Depressing head 22 ... Small cylinder 24 ... Valve 25 ... Second discharge valve 29 ... Stem insertion through hole 30 ... Small auxiliary cylinder 34 ... Second coil spring 38 … Tapered cam surface 43… Third coil spring

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 26, 2002 (2002.3.2.
6)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (4)

[Claims] 1. A press-down head 21 having a nozzle hole which is fitted to an upper end of an operating member stem 6 which is urged upward from the inside of a large cylinder 4 of a vertical pump so as to be able to rise instantaneously. The upper part of the press-down head is formed as a small cylinder 22 laterally provided in the front-rear direction. The front end of the valve stem 24 fitted into the small cylinder by being urged forward, and a nozzle formed in the front wall of the small cylinder. A second discharge valve 25 is formed with the hole 23, and a push-down mechanism having a motion changing mechanism for opening the second discharge valve 25 by retracting the valve rod 24 against urging by pushing down the push-down head. In the head, the press-down head 21 is fitted to the stem 6 so as to be able to move up and down by a small stroke, and is formed in a small cylinder bottom wall 22a to form an insertion through hole 29 into which the stem upper part is inserted. The small auxiliary cylinder 30 communicating with the inside of the small cylinder from the small cylinder bottom wall 22a. Then, the second cylindrical piston 31, which is urged upward and weaker than the urging force of the operating member to the upper outer surface of the stem into the small auxiliary cylinder so as to be vertically movable, is fitted to the small cylinder bottom wall 22 a. The vertical pump is characterized in that the second cylindrical piston 31 is formed so as to be able to descend by pressurizing and fitting, and by increasing the pressure in the small cylinder and the small auxiliary cylinder when the press-down head with respect to the stem 6 descends. Press down head. 2. The valve stem portion above the stem is defined as a small outer diameter portion, and the front surface of a rear large diameter portion 37 formed by the rear portion of the valve stem is formed on a tapered cam surface 38 of a front small diameter. The lower part of the surface is brought into contact with the rear part of the upper surface of the stem 6 and
When the stem 21 is pushed down, the rear portion of the stem upper surface slides upward along the tapered cam surface 38 and projects into the small cylinder, so that the valve stem 24
No retracting motion change mechanism, and when the lower part of the stem is pulled out from the inside of the small cylinder 22 due to the raising of the pressing head from the lowering position, the inside of the small cylinder becomes negative pressure and the nozzle hole
The press-down head of a vertical pump according to claim 1, wherein the outside air is formed so as to be able to be sucked in through (23). 3. While sealing the rear surface of the small cylinder 22,
3. The vertical pump press-down head according to claim 1, wherein a small gap is formed between the outer peripheral surface of the valve stem 24 and the inner wall surface of the small cylinder. 4. A rear large outside diameter portion 37 of the valve stem is formed in a first cylinder portion 45 which is closed at the front and opened at a rear surface, and slides on the inner surface of the first cylinder portion in a watertight manner and slides the first cylinder portion. The second that fits freely
The cylinder part (46) protrudes from the front surface of the small cylinder rear wall, and a third coil spring (43) for urging the valve rod is interposed between the rear surface and the front surface of the two cylinder parts. 3. The press-down head of the vertical pump according to 3.