JP3812073B2 - pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump that is attached to an opening of a container and discharges or sprays liquid contents inside the container.
[0002]
[Prior art]
An example of this type of conventional pump is shown in FIG. 5 (see Japanese Utility Model Laid-Open No. 1-107462). That is, the pump 200 is a reciprocating pump, and is connected to the cylinder-shaped pump body 201 inserted into the container, a piston 202 inserted into the pump body 201 so as to freely reciprocate, and the piston 202. The stem 203 is provided. The stem 203 extends vertically and linearly, and is inserted into a guide hole 205 provided in the guide member 204 at the upper end of the pump body 201 so as to be reciprocally movable. A nozzle portion 206 for ejecting the contents is provided at the upper end portion of the stem 203, and a skirt portion 210 having an internal thread on the inner surface is provided below the nozzle portion 206.
[0003]
The guide member 204 is provided with an elastic cylinder portion 207 slidably in close contact with the stem 203 so that water does not enter the pump body 201 from the gap between the guide hole 205 of the guide member 204 and the stem 203. It was.
[0004]
In particular, the stem 203 is provided with a large-diameter portion 208 and a small-diameter portion 209. While the stem 203 is reciprocated to operate the pump, the elastic cylinder portion 207 is in contact with the small-diameter portion 209 of the stem 203 so as to be friction resistant. As much as possible, the elastic cylinder portion 207 is brought into close contact with the large diameter portion 208 at the most extended position of the stem 203 where the pump is not used to prevent water from entering.
[0005]
In addition, when the skirt portion 210 falls from above the nozzle portion 206 by a shower or the like, the water hits the outer periphery of the skirt portion 210 and the water directly falls into the gap between the guide hole 205 and the stem 203 of the guide member 204. It was preventing that.
[0006]
[Problems to be solved by the invention]
However, in the case of the conventional example described above, the stem 203 is provided with the small diameter portion 209 so that the friction resistance does not act during the operation. However, the dimensions of the elastic cylindrical portion 207 and the stem 203 cannot be accurately formed. It is difficult, and frictional resistance may increase due to variations in the dimensions of the elastic cylindrical portion 207 and the stem 203.
[0007]
In addition, even if the dimensions are strictly controlled, there is a problem that the dust and dust of the contents adhering to the contact portion between the elastic cylinder portion 207 and the stem 203 tend to harden, and the movement of the stem 203 becomes worse.
[0008]
Further, when the pump 200 is attached to the container, the pump 200 is attached to the neck of the container, and then fixed with a gripper in the direction in which the nozzle 206 is discharged, and the body cap 211 is rotated to attach the pump 200. In this case, if the main body cap 211 is tightened too much in the mouth and neck of the container, the position of the nozzle 206 is fixed, so that the nozzle 206 is relatively moved. There has also been a problem that the guide member 204 and the skirt portion 210 are loosened or disengaged due to movement in the direction opposite to the rotating direction of 211.
[0009]
The present invention was made to solve the above-described problems of the prior art, and the object of the present invention is to prevent water from entering the pump body, and when the pump body is mounted, It is an object of the present invention to provide a pump that can prevent a nozzle from rotating carelessly and releasing a locked state.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention,
A cylinder-shaped pump body, a piston that is reciprocally inserted into the pump body, a stem that extends upward from the piston, and an ejector head that is connected to the upper end of the stem and includes a discharge nozzle, a boss portion, and a skirt portion And an upper cap having a guide hole through which the upper end portion of the pump body is closed and the stem is reciprocally moved. The skirt portion of the ejector head is formed from the top of the spherical crown at the upper end of the boss portion. It extends downward so as to surround the boss part, and a female screw is formed at the inner periphery of the lower end. The upper cap is composed of a small-diameter upper half and a large-diameter lower half, and an opening for a guide hole formed in the small-diameter upper half The inner surface of the pump can be slidably contacted with the pump operating shaft during pump operation, and the upper half of the small diameter can be screwed with the internal thread at the lower end of the inner periphery of the skirt. Male screw is formed, the large径下halves, when a said skirt portion and the small-diameter upper half was threadedly engaged, approximately the same as the lower outer diameter of the skirt portion the lower end of the skirt portion are in contact with the stepped portion top surface It is formed in a diameter.
[0012]
And by making the upper half part of the upper cap small in diameter and making the lower half part large in diameter, it is possible to make it difficult to collect water in the upper half part of the upper cap and to improve the appearance of the appearance. The outer diameter of the holding portion is larger or substantially the same as the outer diameter of the ejector head, so that the appearance is better and it is possible to prevent dust and the like from collecting during transportation. Also, when the outer periphery of the upper cap and the inner periphery of the ejector head are screwed together, the lower end of the skirt portion of the ejector head is in contact with the top surface of the step portion between the upper half and the lower half of the upper cap. The screwing end at the time of screwing the ejector head is ensured, and it is possible to prevent the nozzle portion from being inadvertently rotated due to excessive screwing when mounting on the container.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
1 and 2 show a pump according to a first embodiment of the present invention.
[0016]
The pump 1 is used for a stationary shampoo container or the like, and includes a cylindrical pump body 3 having a pump chamber 2 inserted into the container from an opening of the container and storing liquid therein, and a pump body 3 An upper cap 4 that closes the upper end opening of the pump, a piston 5 as a movable member that is reciprocally inserted into the pump body 3 and expands and contracts the volume of the pump chamber 2, and a guide hole provided in the upper cap 4 6, an operation shaft 7 that is reciprocally inserted to operate the piston 5, an ejector head 9 having a discharge nozzle 8 connected to the upper end of the operation shaft 7, the pump chamber 2, and the container. A suction passage 10 that communicates, a discharge passage 11 that communicates the pump chamber 2 and the discharge nozzle 8 of the ejector head 9, a suction valve 12 provided in the suction passage 10, and a discharge provided in the discharge passage 11. A valve 13, a spring member 14 for urging the piston 5 in the direction to expand the constantly pumping chamber 2 volumes, and a.
[0017]
The pump body 3 is a cylindrical member provided with a suction valve 12 on its bottom wall and opened at the upper end, and a flange portion 15 projecting radially outward is provided at the upper end portion. The upper end of the mouth and neck formed in the part is engaged through a gasket 16. A cylindrical wall 17 that protrudes further upward than the flange portion 15 is formed by protruding at the base position of the flange portion 15 of the pump body 3.
[0018]
Further, the flange portion 15 of the pump body 3 is fixed by a container cap 18 that is screwed to the container neck. The container cap 18 includes a cylindrical portion 18a provided with an internal thread portion that is screwed into an external thread portion on the outer periphery of the container mouth neck, an inward flange that extends inward from the upper end of the cylindrical portion 18a. 18b, the inward flange portion 18b engages with the upper surface of the flange portion 15 of the pump body 3, and the container cap 18 is screwed onto the outer periphery of the container neck so that the flange portion 15 of the pump body 3 is It is firmly fixed by tightening up and down between the container neck and the upper end of the neck.
[0019]
The piston 5 is formed integrally with the operating shaft 7, and the lower end of the operating shaft 7 protrudes downward from the piston 5, and the valve body 12 a of the intake valve 12 can be pressed by the lower end of the operating shaft 7. Yes.
[0020]
The piston 5 is always urged upward by a spring member 14 mounted in the pump chamber 2, that is, in a direction in which the pump chamber 2 is expanded, and in a free state, the operation shaft 7 moves upward from the upper surface of the upper cap 4. Is in a stretched state.
[0021]
The ejector head 9 has a head main body 19 having a round top surface and a discharge nozzle 8 extending laterally from the side surface of the head main body 19.
[0022]
The head main body 19 includes a central boss portion 20 and a skirt portion 21 that extends downward from the peripheral edge of the top surface of the spherical crown at the upper end of the boss portion 20 so as to surround the boss portion 20.
[0023]
The boss portion 20 has a cylindrical shape with the upper end closed and the lower end opened, and a cylindrical joint portion 22 for connecting to the upper end of the operation shaft 7 is formed on the lower surface of the annular boss portion 20 on the inner diameter end side. .
[0024]
In this embodiment, a female screw 21 a is provided on the inner periphery of the lower end of the skirt portion 21, and is formed so as to be able to be screwed with a male screw 41 a provided on the outer periphery of the small-diameter upper half 41 of the upper cap 4.
[0025]
The discharge nozzle 8 extends slightly incline upward with respect to the horizontal direction, and the tip is bent downward. A base end portion of the discharge nozzle 8 passes through the skirt portion 21 and is connected to the boss portion 20. One end of the discharge hole 81 passing through the discharge nozzle 8 is also opened at the tip of the discharge nozzle 8, and the other end communicates with the space inside the boss portion 20. Further, a protrusion 23 protruding downward is provided at the center of the upper bottom wall of the boss portion 20, and the lower end of the protrusion 23 extends to a position facing the opening of the discharge hole 81.
[0026]
The upper cap 4 has a small-diameter upper half 41 having a male screw 41a that can be screwed with a female screw 21a provided on the inner periphery of the lower end of the skirt portion 21 of the ejector head 9, and an outer diameter of the lower end of the skirt portion of the ejector head. The large-diameter lower half portion 42 is integrally formed. A guide hole 6 is opened at the upper end of the small-diameter upper half 41 , and the inner surface of the guide hole 6 is in sliding contact with the operation shaft 7.
[0027]
Further, in this embodiment, as shown in FIG. 1, when the small-diameter upper half 41 and the skirt portion 21 of the ejector head 9 are screwed together, the diameter is larger than the outer diameter of the ejector head 9. The outer diameter of the lower half part 42 is substantially equal. Further, the lower end of the skirt portion 21 is in contact with the top surface of the stepped portion between the small-diameter upper half 41 and the large-diameter lower half 42 of the upper cap 4 .
[0028]
The suction valve 12 provided on the bottom wall of the pump body 3 includes a valve seat 12b protruding from the bottom wall into the pump chamber 2, a valve body 12a contacting and separating from the valve seat 12b, and the valve body 12a to the valve seat. A valve guide 12d inserted in a valve hole 12c provided in 12b so as to be movable up and down, and the valve body 12a is always urged in the valve closing direction, and the valve body 12a is seated on the valve seat 12b to maintain the valve closed state. And presser spring 12e. The presser spring 12e is disposed in the valve hole 12c. When the pressure in the pump chamber 2 becomes equal to or lower than a predetermined pressure with respect to the internal pressure in the container, the valve body 12a of the suction valve 12 rises from the valve seat 13b against the presser spring 12e and is opened.
[0029]
On the other hand, the bottom surface of the bottom wall of the pump body 3 is provided with a connecting tube portion 24 in which the valve hole 12c of the suction valve 12 protrudes downward from the opening edge in a cylindrical shape, and the suction passage 10 is connected to the connecting tube portion 24. The dip tube 25 which comprises is connected.
[0030]
The hollow inside of the operating shaft 7 constitutes a liquid discharge passage 11, and a discharge valve 13 is provided at the upper end thereof. The discharge valve 13 includes a valve seat 13b formed on the inner periphery of the discharge passage 11, and a ball-shaped valve body 13a provided on the upper surface side of the valve seat 13b so as to close the central valve hole 13c. The valve body 13a closes the valve seat 13b by its own weight. When the internal pressure of the pump chamber 2 becomes higher than the atmospheric pressure by a predetermined pressure or more, the valve body 13a of the discharge valve 13 is lifted and opened. The lifted valve body 13a is in contact with the protrusion 23 so as not to block the discharge hole 81 of the discharge nozzle 8.
[0031]
According to the present invention, the suction valve 12 is opened when the pressure in the pump chamber 2 is negative and closed when the pressure is positive, and the discharge valve 13 is closed when the pressure in the pump chamber 2 is negative and opened when the pressure is positive. It has become.
[0032]
As shown in FIG. 1, in the locked position, the locked state is maintained by the screw engagement between the female screw 21 a at the inner periphery of the lower end of the skirt portion 21 and the male screw 41 a of the small-diameter upper half 41 of the upper cap 4. . Further, the outer periphery of the cylindrical joint portion 22 at the lower end of the ejector head 9 connected to the reduced diameter portion at the upper portion of the operation shaft 7 enters the inner periphery of the guide hole 6. On the other hand, the lower end of the operating shaft 7 of the pump body 3 is in contact with the upper surface of the valve body 12a of the suction valve 12, and the valve body 12a is pressed against the valve seat 13b to maintain the valve closed state.
[0033]
Then, when the ejector head 9 is rotated with respect to the upper cap 4 to release the screw engagement between the female screw 21a at the inner periphery of the lower end of the skirt portion 21 and the male screw 41a of the small-diameter upper half portion 41 of the upper cap 4, as shown in FIG. As described above, the operating shaft 7 protrudes upward by the urging force of the spring member 14, and the piston 5 moves upward to expand the volume in the pump chamber 2, so that the pressure in the pump chamber 2 becomes negative. Due to this negative pressure, the suction valve 12 is opened and a certain amount of liquid is automatically sucked into the pump chamber 2 from the container. This state is a use standby state.
[0034]
When the operating shaft 7 is pushed against the spring force of the spring member 14 from this standby state, the pump chamber 2 is compressed by the piston 5 and the discharge valve 13 is opened, so that the liquid sucked into the pump chamber 2 is ejected. The ink is discharged through the discharge nozzle 8 of the head 9.
[0035]
When the pump 1 is mounted on a container, the container is first filled with liquid, and then the pump 1 in a locked state is placed on the upper end of the mouth / neck portion of the container. Next, while pressing the side surfaces of the ejector head 9 and the upper cap 4 with a gripper of a pressing member (not shown) , the container cap 18 is rotated clockwise as viewed from above the ejector head 9 by using a roll or the like. Screw on the outer periphery.
[0036]
Thus, in the present invention, the upper cap 4 is configured by the small-diameter upper half 41 and the large-diameter lower half 42, and the lower end inner periphery of the skirt portion 21 of the ejector head 9 and the small-diameter upper half 41 of the upper cap 4. Since the outer periphery can be screw-engaged, the guide hole 6 and the operation shaft 7 are in sliding contact with each other, and water accumulated at the upper end of the small-diameter upper half 41 of the upper cap 4 is a gap between the guide hole 6 and the operation shaft 7. Can be prevented from entering the pump body 3.
[0037]
Further, when the pump 1 is mounted on the container, the container cap 18 is rotated by holding the upper cap 4 and the ejector head 9, so that only the container cap 18 rotates, and the ejector head 9 rotates together with the container cap 18. Thus, the screw can be prevented from loosening or coming off.
[0038]
[Other embodiments]
In the above embodiment, the upper end of the small-diameter upper half 41 of the upper cap 4 has a substantially horizontal shape. However, as shown in FIGS. 3 and 4, the upper end of the small-diameter upper half 41 is outward. It is also possible to make the shape inclined downward. In this case, the water that has fallen on the upper end of the small-diameter upper half 41 does not escape and accumulate on the outer diameter side due to the action of gravity, so that it is possible to further prevent water from entering the pump body 3.
[0039]
【The invention's effect】
As described above, according to the present invention, the upper cap is composed of the small-diameter upper half and the large-diameter lower half, and the inner periphery of the lower end of the skirt of the ejector head and the outer periphery of the upper-diameter of the upper cap are formed. Since the screw engagement is possible, the guide hole and the operating shaft are in sliding contact, so that air can flow into the pump body, but water collected at the upper half of the upper half of the upper cap Intrusion into the pump body from the gap between the guide hole and the operating shaft can be prevented.
[0040]
When the pump is mounted on the container, the diameter of the lower half of the large diameter of the upper cap is substantially the same as the diameter of the skirt portion of the ejector head, so that the tip of the gripper as the pressing member is Only the container cap is rotated while holding the outer surface of the lower half of the upper diameter of the upper cap and the skirt of the ejector head, so that the ejector head rotates with the container cap and prevents the screw from loosening or coming off. it can.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a locked state of a pump according to a first embodiment of the present invention.
2 is a longitudinal sectional view of the pump of FIG. 1 in use.
FIG. 3 is a longitudinal sectional view showing a locked state of a pump according to another embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of the pump of FIG. 3 in use.
FIG. 5 is a longitudinal sectional view of a conventional pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump 2 Pump chamber 3 Pump main body 4 Upper cap 5 Piston 6 Guide hole 7 Operation shaft 8 Discharge nozzle 9 Ejector head 10 Intake passage 11 Discharge passage 12 Intake valve 13 Discharge valve 14 Spring member 15 Flange part 16 Gasket 17 Cylindrical wall 18 Container Cap 19 Head body 20 Boss part 21 Skirt part 21a Female thread 22 Tubular joint part 23 Projection 24 Connection cylinder part 25 Dip tube 41 Small-diameter upper half 41a Male thread 42 Large -diameter lower half

Claims (1)

A cylinder-shaped pump body, and a piston that is reciprocally inserted into the pump body;
A stem that extends upward from the piston, an ejector head that is connected to the upper end of the stem and includes a discharge nozzle, a boss portion, and a skirt portion, closes the upper end portion of the pump body, and allows the stem to reciprocate freely In a pump comprising an upper cap having a guide hole to be inserted,
The skirt portion of the ejector head extends downward from a spherical crown-shaped top surface periphery of the upper end of the boss portion so as to surround the boss portion, and has an internal thread formed at the inner periphery of the lower end, and the upper cap has a small-diameter upper half portion And an inner surface of the opening of the guide hole formed in the upper half portion of the small diameter can be slidably contacted with the pump operating shaft during pump operation, and the upper half portion of the small diameter is A male screw that can be screw-engaged with a female screw at the inner peripheral lower end of the skirt portion is formed on the outer periphery, and the large- diameter lower half portion is formed when the small-diameter upper half portion and the skirt portion are screw-engaged. The pump is characterized in that the lower end of the pump is in contact with the top surface of the stepped portion and is formed to have substantially the same diameter as the outer diameter of the lower end of the skirt portion.

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