JPH0674147A - Pump - Google Patents

Abstract

PURPOSE:To prevent fluid inside a nozzle part from remaining by opening a discharge valve with a suction valve closed for a certain time after completion of discharging by means of a back-suction mechanism. CONSTITUTION:On the way of a stroke of pressing down a nozzle 6, an end coil part 18 which is provided in the middle of a spring member 10 is brought into contact with a check ball 73, and the spring force of the spring member 10 makes the check ball 73 come into action. After this, the check ball 73 of the suction valve is pressed against a valve seat 72 by the end coil part 18 of the spring member 10 by a specified stroke after completion of discharging, the volume of a pump room 2 increases with the suction valve 7 sealed, so back suction is carried out before the check ball 93 of the discharge valve 9 at the upper part returns to a valve seat 92. Besides, when the check ball 93 of the discharge valve 9 at the upper part returns to the valve seat 92, back suction is completed to start suction. It is, thus possible to return remaining fluid in the nozzle part 6 into the pump room 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for discharging a content liquid such as a stationary type shampoo container.

[0002]

2. Description of the Related Art A conventional pump of this type is, for example, one described in British Patent No. 2119868A. That is, as shown in FIG. 5, a pump body 101 having a pump chamber 100 for storing liquid therein,
The pump chamber 1 is reciprocally inserted into the pump body 101.
00 for expanding and contracting the volume of 00, a nozzle portion 104 connected to the piston 102 via a stem 103, and a suction valve 1 provided in the pump body 101.
05, a discharge valve 107 provided in the middle of a passage 106 that communicates the inside of the pump chamber 100 and the nozzle portion 104, and a spring member 108 that constantly urges the piston 102 in a direction of expanding the volume of the pump chamber 100. I have it.

The suction valve 105 is opened when the inside of the pump chamber 100 is under negative pressure and closed when the inside of the pump chamber 100 is under positive pressure, and the discharge valve 107 is opened in the pump chamber 1.
The inside of 00 is closed when the pressure is negative and opened when the pressure is positive.

In operation of this pump, the nozzle portion 104 is pushed by hand against the spring force of the spring member 108, and the hand is released while the pump chamber 100 is contracted. Then, the urging force of the spring member 108 moves the piston 102 to expand the volume inside the pump chamber 100, and the inside of the pump chamber 100 becomes negative pressure. The suction valve 105 is opened by this negative pressure, and a certain amount of the content liquid is automatically sucked into the pump chamber 100.

When the nozzle portion 104 is pushed again against the spring force of the spring member 108, the pump chamber 100 is compressed by the piston 102 and the discharge valve 107 opens,
The liquid content sucked into the pump chamber 100 is the nozzle portion 104.
Will be discharged through.

[0006]

However, in the above-mentioned conventional pump, there is a problem that the liquid dripping from the nozzle portion 104 is remarkable and the content liquid is wasted.

In addition, when the content liquid has a high viscosity, the liquid remaining in the nozzle portion 104 is solidified and clogged, or the liquid jumps out in the other direction, and there is a problem that the usability is poor.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to:
An object of the present invention is to provide a pump capable of preventing the liquid in the nozzle portion from remaining.

[0009]

In order to achieve the above object, according to the present invention, a pump body having a pump chamber for storing a liquid therein, and a pump body reciprocally inserted therein. A piston that expands and contracts the volume of the pump chamber, a nozzle portion that is connected to the piston through a stem, a suction valve that is provided in the pump body, and a passageway that connects the pump chamber portion and the nozzle portion Discharge valve and a spring member for constantly urging the piston in a direction to expand the volume of the pump chamber, the suction valve opens when the pump chamber has a negative pressure and closes when the pump chamber has a positive pressure. Is configured to be closed when the pump chamber has a negative pressure and open when the pump chamber has a positive pressure. The nozzle portion is pushed in against the spring force of the spring member to contract the pump chamber from the piston force by the spring force of the spring member. Move The volume inside the pump chamber is expanded, the suction valve is opened by the negative pressure generated in the pump chamber, and the liquid is automatically sucked into the pump chamber, the head portion is pushed again against the spring force of the spring member, and the pump is pumped by the piston. In a pump that compresses the chamber and opens the discharge valve to discharge the liquid in the pump chamber through the nozzle, when the piston moves in the expansion direction by the spring member after the discharge is completed, the suction valve is closed and the discharge valve Is provided with a back suction mechanism for holding the open state and for returning the liquid remaining in the passage from the discharge valve to the opening of the nozzle portion to the cylinder chamber by the negative pressure generated in the pump chamber during this period. .

The back suction mechanism forcibly delays the timing at which the suction valve switches from the closed state to the open state by a predetermined stroke when returning from the stroke end of the piston at the time of completion of discharge by the urging force of the spring member. It is characterized by

The suction valve is provided with a check ball that abuts against the valve seat by its own weight to seal the valve seat, the spring member is formed of a coil spring, and a coiled portion is provided in the middle of the spring member. It is characterized in that the position where the end turn portion starts to press the check ball is set within the discharge stroke.

[0012]

According to the present invention, the back suction mechanism is used to open the discharge valve with the suction valve closed for a fixed time after the discharge is completed. Therefore, the nozzle portion is pushed up by the spring member during this period. The liquid content remaining in the pump is returned to the pump chamber. When the back suction process is completed, the discharge valve is closed and the suction valve is opened, and the content liquid is sucked into the pump chamber as the spring member moves.

Further, if the back suction mechanism is constituted by the end turn portion provided in the middle of the spring member, the back suction function can be realized with a very simple structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 2 shows a pump according to an embodiment of the present invention.

The pump 1 is used for a stationary shampoo container or the like similar to the conventional one, and a pump body 3 having a pump chamber 2 for storing a liquid therein and a reciprocating motion in the pump body 3 are possible. 4 which is inserted into the pump chamber 2 to expand and contract the volume of the pump chamber 2, a nozzle portion 6 connected to the piston 4 via a stem 5, a suction valve 7 provided in the pump body 3, an inside of the pump chamber 2 and a nozzle. It is composed of a discharge valve 9 provided in the middle of a passage 8 communicating with the portion 6, and a spring member 10 for constantly urging the piston 4 in a direction of expanding the volume of the pump chamber 2.

The pump body 3 has a cylindrical shape and is inserted into the container through the opening of the container. The upper end of the pump body 3 is provided with a flange portion 12 that engages with the upper end of the rim portion 11 of the container. The flange portion 12 is fixed by a cap 13 screwed onto the outer periphery of the container rim portion 11. Also,
A guide ring 14 for guiding the stem 5 is attached to the upper end of the pump body 3. This guide ring 14
On the inner circumference, the male screw 1 provided on the nozzle portion 6 when locked
A female screw 16 to be screwed with the screw 5 is provided.

On the other hand, the pump body 3 inserted inside the container
A suction valve 7 is provided at the lower end of the pipe, and a pipe 17 extending toward the bottom of the container is connected to the suction valve 7.

The stem 5 is a hollow cylindrical member, the lower end of which is integrally formed with the piston 4, and the upper end of which is provided with a separate nozzle portion 6.

The suction valve 7 is a one-way valve as a check valve that opens when the inside of the pump chamber 2 is under negative pressure and closes when the inside of the pump chamber 2 is under positive pressure. A suction port 71 is formed in the bottom of the pump chamber 2 of the pump body 3 Valve seat 72 formed on the rim of the
The check ball 73 is provided as a valve body that is provided so as to be able to come into contact with and separate from the second ball 2. In its natural state, the check ball 73 contacts the valve seat 72 by its own weight and maintains the suction port 71 in the closed state.

The discharge valve 9 is a one-way valve as a check valve which is closed when the inside of the pump chamber 2 is under negative pressure and is opened when the inside of the pump chamber 2 is under positive pressure, and has a discharge port 91 formed in the passage 8 of the stem 5. A valve seat 92 and a check ball 93 as a valve element that is provided so as to be able to come into contact with and separate from the valve seat 92. Like the suction valve 7, the check ball 93 also maintains the discharge port 91 in the closed state by its own weight in the natural state.

The valve elements of the suction valve 7 and the discharge valve 9 described above are not the check balls 73 and 93 shown in the figure, but a valve element made of resin as shown in FIGS. 4 (b) and 4 (c), for example. You may make it use 73a, 93a.

The spring member 10 is a coil spring, which is inserted into the pump chamber 2 in a compressed state. One end of the spring member 10 is engaged with the piston 4 and the other end is engaged with the bottom surface of the pump chamber 2.
Is urged in the direction of expanding the volume of the pump chamber 2, that is, in the illustrated example, in the direction of pushing up. And this spring member 10
An end turn portion 18 is provided in the middle of. This end turn part 1
8, the check ball 73 of the suction valve 7 when locked
In addition to pressing and sealing, the back-suction function is provided by setting the position where the pressing is started within the discharge stroke. The position of the end turn part 18 is shown in FIG.
As shown in FIG. 2B, it is provided symmetrically in two places in consideration of the embedding property, but only one as shown in FIG.

The back suction mechanism keeps the suction valve 7 closed and the discharge valve 9 open for a certain period of time when the piston 4 moves in the expanding direction by the spring member 10 after the discharge is completed, during which the pump is pumped. The passage 8 from the discharge valve 9 to the opening of the nozzle portion 6 due to the negative pressure generated in the chamber 2.
The liquid remaining inside is returned into the pump chamber 2.

In this embodiment, as the back suction mechanism, the end winding portion 18 of the spring member 10 is moved by a predetermined stroke when the piston 4 is returned from the stroke end at the time of completion of discharge by the urging force of the spring member 10. It is configured to forcibly delay the timing at which the suction valve 7 is switched from the closed state to the open state by utilizing it.

As shown in FIG. 2, in the natural state, the set length of the spring member 10 is D, the end turn portion 18 and the spring member 10 are set.
Assuming that the distance from the seat is E and the preset distance between the end turn portion 18 and the check ball 73 is F, as the nozzle portion 6 is pushed, D becomes smaller and the distances E and F also become smaller.
Then, F becomes zero at a certain stroke C, and the end turn portion 18 hits the check ball 73. When the stroke becomes larger than C, the end turn portion 18 moves to the check ball 73.
Is pressed against the valve seat 72 to seal the suction port 71. In order to have a back suction function, it is necessary to make stroke C smaller than ejection stroke A (see FIG. 1).
(See (a) and (b)).

FIG. 3 shows a usage state of this pump, and each process will be described below.

FIG. 3A shows the locked state.
In this locked state, the nozzle portion 6 is pushed down against the spring force of the spring member 10, and the male screw 15 of the nozzle portion 6 is screwed into the female screw 16 on the inner circumference of the guide ring 14. In this way, the piston 4 is pushed down below the normal discharge stroke, the check ball 73 of the suction valve 7 is strongly pressed against the valve seat 72 by the end turn portion 18 of the spring member 10, and the suction port 71 The product is sealed to prevent spillage of the content liquid during transportation or during store display.

FIG. 3B shows the spring member 1 in a free state.
The piston is brought into contact with the guide ring by the spring force of 0 and positioned at the upper limit position. At this time, it is assumed that the pump chamber 3 is filled with the content liquid by suction.

FIG. 3C shows the middle of the discharging process.
In particular, the position where the seal of the check ball 73 of the suction valve 7 is started by the end turn portion 18 of the spring member 10 is shown. In this process, the nozzle portion 6 is pushed against the spring force of the spring member 10 and the pump chamber 2 is compressed by the piston 4. This pressure causes the check ball 7 of the suction valve 7
3 is pressed against the valve seat 72 and kept closed, and the discharge valve 9
Check ball 93 is separated from the valve seat 92, and the discharge port 91
Is opened, and the content liquid in the pump chamber 2 is discharged through the nozzle portion 6. It is desirable to use the check ball 93 of the upper discharge valve 9 having a small diameter.

In the case of a highly viscous content liquid such as shampoo, the check ball 93 causes the valve seat 9 to move due to the flow of the content liquid.
It is not located at position 2, but exists at a position away from the valve seat 92 as shown. During normal use, since the nozzle portion 6 is strongly pressed and the content liquid is ejected strongly,
The check ball 93 is provided on the upper end wall 81 of the passage 8 of the nozzle portion 6.
It is preferable that the upper end wall 81 be provided with the stopper 19 as shown in FIG. 4A, because the passage 61 in the nozzle 6 may be blocked and the passage 61 in the nozzle 6 may be blocked.

In the middle of this discharge stroke, as shown in an enlarged view in FIG. 1A, the end turn portion 18 of the spring member 10 contacts the check ball 73, and the spring member 10 is in contact.
Spring force starts to act on the check ball 73.

At this point, there is some margin between the external thread 15 of the nozzle portion 6 and the threading start position of the internal thread 16 of the guide ring 14.

3 (d) and 1 (b) show the discharge end position, in which the male screw 15 of the nozzle portion 6 and the threading start position of the female screw 16 of the guide ring 14 are in contact with each other. At this moment, the flow of the content liquid stops and the check ball 93 of the discharge valve 9 begins to drop toward the valve seat 92 due to its own weight, but it does not immediately contact the valve seat 92 due to the viscosity of the content liquid.

When the nozzle 6 is released, the spring force of the spring member 10 pushes the piston 4 upward,
Back suction starts.

That is, the check ball 73 of the suction valve is pressed against the valve seat 72 by the end turn portion 18 of the spring member 10 for a predetermined stroke from the end of the discharge, and the suction valve 7 remains sealed in the pump chamber 100. Due to the increase in volume, the check ball 93 of the upper discharge valve 9 is attached to the valve seat 92.
Back suction occurs until it returns to.

Then, as shown in FIGS. 3 (e) and 1 (c), the check ball 93 of the discharge valve 9 on the upper side is attached to the valve seat 92.
When the process returns to, back suction is completed and inhalation is started.

The time during which the check ball 93 of the discharge valve 9 is open is determined by the viscosity of the content liquid and the specific gravity of the check ball 93. Therefore, by changing the specific gravity of the check ball 93 according to the viscosity of the content liquid, the time when the check ball 93 is open can be adjusted. For example, if the viscosity of the content liquid is about 200 cp, even if a steel ball is used as the check ball 93, a practically good back suction function is obtained. Further, if the check ball 93 is made of a material having a lower specific gravity than the content liquid, the discharge valve 9 is open until the back suction is completed, and the back suction can be reliably performed.

In addition, as means for adjusting the closing timing of the check ball 93, for example, FIGS. 4 (d) and 4 (e) are used.
As shown in, the projection 20 on which the check ball 93 is caught may be formed on the inner circumference of the passage 8. By doing so, the timing at which the check ball 93 closes can be forcibly delayed.

FIG. 3 (f) shows the middle of the inhalation process. In this process, the check ball 93 of the discharge valve 9 is
Due to its own weight and the negative pressure generated inside the pump chamber 2, it is pressed against the valve seat 92 and held in the closed state. On the other hand, the check ball 73 of the suction valve 7 separates from the valve seat 72 and the suction port 7
1, the liquid inside the container is sucked into the pump chamber 2,
It returns to its natural state as shown in FIG.

[0040]

The present invention has the above-mentioned structure and operation, and is provided with a back suction mechanism so that the suction valve is closed and the discharge valve is kept open for a predetermined time after the completion of discharge. Therefore, during this time, the liquid remaining in the nozzle portion can be returned to the pump chamber, dripping from the nozzle portion can be prevented, and the content liquid can be saved.

Further, even in the case of a highly viscous content liquid, there is no possibility of clogging in the nozzle portion as in the conventional case, and the content liquid can always be discharged smoothly.

Further, if the back suction mechanism is constructed by utilizing the end turn provided in the middle of the spring member, the structure can be simplified and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 (a), (b), (c) is a cross-sectional view of an essential part for explaining a back suction process of a pump of the present invention.

2 (a) is a longitudinal sectional view showing the overall configuration of the pump of FIG. 1, FIG. 2 (b) is a front view of a spring member, and FIG. 2 (c) is another configuration example of the spring member. It is a front view.

3 (a) to 3 (g) are explanatory views of a usage state of the pump of FIG. 2 (a).

4A is a cross-sectional view of a nozzle portion provided with a stopper, FIG. 4B is a cross-sectional view showing another configuration example of a discharge valve, and FIG. 4C is another configuration of a suction valve. FIG. 6D is a cross-sectional view showing an example, FIG. 7D is a cross-sectional view showing still another configuration example of the discharge valve, and FIG. 6E is a cross-sectional view taken along the line ee of FIG.

FIG. 5 is a vertical cross-sectional view of a conventional pump.

[Explanation of symbols]

 1 Pump 2 Pump Chamber 3 Pump Main Body 4 Piston 5 Stem 6 Nozzle Part 7 Suction Valve 73 Check Ball 8 Passage 9 Discharge Valve 93 Check Ball 10 Spring Member 18 End Winding Part (Back Suction Mechanism)

Claims (3)

[Claims] 1. A pump main body having a pump chamber for storing liquid therein, a piston reciprocally inserted into the pump main body for expanding and contracting the volume of the pump chamber, and a stem for the piston. A nozzle part connected to the pump body, a suction valve provided in the pump body, a discharge valve provided in the middle of a passage communicating the interior of the pump chamber and the nozzle part, and the piston always attached in a direction to expand the volume of the pump chamber. The suction valve is configured to open when the pump chamber has a negative pressure and close when the pressure is positive, and the discharge valve closes when the pump chamber has a negative pressure and opens when the pump chamber has a positive pressure. , The negative pressure generated in the pump chamber by pushing the nozzle portion against the spring force of the spring member and moving the piston from the state of contracting the pump chamber by the spring force of the spring member to expand the volume in the pump chamber. By The suction valve is opened to automatically suck the liquid into the pump chamber, the nozzle portion is pushed again against the spring force of the spring member, the pump chamber is compressed by the piston, the discharge valve is opened, and the liquid inside the pump chamber is nozzled. When the piston moves in the expansion direction by the spring member after the discharge is completed, the suction valve is kept closed and the discharge valve is kept open for a certain period of time after the discharge is completed. A pump provided with a back suction mechanism for returning the liquid remaining in the passage from the discharge valve to the opening of the nozzle portion to the pump chamber by pressure. 2. The back suction mechanism forcibly sets the timing at which the suction valve switches from the closed state to the open state by a predetermined stroke when returning from the stroke end of the piston at the time of completion of discharge by the biasing force of the spring member. The pump according to claim 1, wherein the pump is configured to be delayed. 3. The suction valve is provided with a check valve that comes into contact with the valve seat by its own weight and seals the valve seat, and the spring member is formed of a coil spring. The pump according to claim 2, wherein the pump is provided, and a position at which the end turn portion starts pressing the check valve is set within a discharge stroke.