JPH09220502A - Check valve structure for resin pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the pump performance by improving the seal properties in opening a check valve built in a resin pump. SOLUTION: A liquid jet valve 70 is set in a stem 40 of a resin pump. The liquid jet valve 70 is constituted of a valve seat component 41 set on the inner wall of the stem 40 and a spherical valve 71, and the valve seat component 41 is constituted of an annular body having an L-shaped section formed of a horizontal section 41a extending orthogonally from the inner wall of the stem 40 and a vertical section 41b bending orthogonally from the end of the horizontal section 41a and extending upward, and the end inner peripheral face of the vertical section 41b is formed into a tapered valve seat 41c. The valve 71 is set on and separated off the valve seat 41c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve structure for a resin pump.

[0002]

2. Description of the Related Art Some containers containing shampoo or the like are equipped with a manual pump on the upper part thereof. A resin pump is generally used for this type of pump, and a check valve is built in the pump as a suction valve and a discharge valve.

This check valve has a structure as shown in FIG. Explaining this, an annular valve seat member 901 extends obliquely upstream from the inner wall of the liquid passage 900, the inside of the valve seat member 901 serves as a flow path, and a spherical shape is provided downstream of the valve seat member 901. The valve body 902 is housed, and the valve body 902 is seated on and away from the valve seat 901c of the valve seat member 901 to open and close the flow path.

[0004]

However, when a conventional check valve structure having a check valve structure is injection-molded with resin, the valve seat member 9 is formed.
Since 01 has a structure that obliquely protrudes from the inner wall of the liquid passage 900, a sink mark occurs when the resin forming the valve seat member 901 solidifies by cooling, and the valve seat 901c of the valve seat member 901 is desired. However, there is a problem in that the sealing performance when the valve body 902 is seated is poor and the pump performance is deteriorated.

The "sink" of the valve seat member is the valve seat member 90.
When the rib 903 of the protrusion is provided on the upstream side of No. 1 along the axial direction of the liquid passage 900, it appears remarkably. The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to provide a check valve structure for a resin pump having a good sealing property and improving the pump performance.

[0006]

The present invention adopts the following means in order to solve the above problems. According to the present invention, an annular valve seat member is provided so as to project inward from an inner wall of a liquid passage in a pump made of resin, the inside of the valve seat member serves as a flow path, and a downstream side of the valve seat member is provided. In a check valve structure in a resin pump in which the arranged valve element is seated on and away from the valve seat of the valve seat member to open and close the flow path, the valve seat member projects substantially inward from the inner wall of the liquid passage. After that, the check valve structure in a resin pump is characterized in that it is bent in the downstream direction, and a valve seat is formed at the tip thereof (corresponding to claim 1). The valve seat member may be formed in an annular shape having a substantially L-shaped cross section, for example.

Between the inner wall of the liquid passage and the valve seat of the valve seat member,
By providing the valve seat member with a portion that protrudes substantially vertically inward from the inner wall of the liquid passage, even if "sink" occurs when the valve seat member is injection-molded and solidified, the "sink" will cause It has almost no effect on the seat. Therefore, the sealing performance between the valve body and the valve seat when the valve is closed is very good, and the pump performance is improved.

On the inner wall of the liquid passage, on the upstream side of the valve seat member, it is possible to provide a rib of a ridge extending along the axial direction of the liquid passage and connected to the valve seat member. Even when the rib is provided as described above, the "sinker" has almost no effect on the valve seat, and the sealing property between the valve seat and the valve body does not deteriorate when the valve is closed.

<Raw Material of the Present Invention> In the check valve structure of the present invention, the valve seat member needs to be formed integrally with the liquid passage with resin, but the valve element need not necessarily be made of resin. It may be made of metal or ceramic.

Specific examples of the resin forming the valve seat member include polypropylene (hereinafter referred to as PP), high density polyethylene and the like. When the valve body is made of resin, PP, polyacetal or the like can be exemplified.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
1 to 7 will be described with reference to the drawing.

[First Embodiment] FIGS. 1 and 2 are longitudinal sectional views of a container with a foam jet pump having a check valve structure according to the present invention, and FIGS. 3 to 5 are enlarged views of essential parts thereof. Is.

<Structure> First, the structure of the container with the foam jet pump will be described. The container with a foam ejection pump is configured by attaching a resin foam ejection pump 10 to the mouth tube portion 2 of the container body 1. The container body 1 contains a liquid having a foaming property such as facial cleansing liquid.

The foam jet pump 10 includes a cylinder member 20.
, Liquid suction valve 30, stem 40, and first piston 50
A second piston 60, a liquid discharge valve (check valve) 70,
The first air intake valve 80, the second air intake valve 90, the pump head 100, the foaming unit 130, and the mounting cylinder 150.
And

The cylinder member 20 has an annular flange portion 21 at its upper end, and a cylindrical large-diameter cylinder portion 22 having an air chamber inside extends downward from the flange portion 21 and has a cylindrical shape having a liquid chamber inside. The small diameter cylinder part 24 is the large diameter cylinder part 2
The second bottom plate portion 23 extends concentrically downward, and the connecting cylinder 25 extends downward from the lower end of the small diameter cylinder portion 24.

In this cylinder member 20, a large-diameter cylinder portion 22, a small-diameter cylinder portion 24, and a connecting cylinder 25 are inserted from the mouth cylinder portion 2 into the container body 1, and the packing 20 is provided on the upper surface of the mouth cylinder portion 2.
0 and the flange portion 21 are placed and fixed to the container body 1 by a mounting cylinder 150 that is screwed into the mouth cylinder portion 2. The flange portion 21 is provided with a plurality of air holes 27 in a portion located inside the mouth tube portion 2.

A suction pipe 201 is connected to the connecting cylinder 25 of the cylinder member 20, and the lower end of the suction pipe 201 extends to the bottom of the container body 1. A central cylinder portion 151 is provided at the center of the mounting cylinder 150, and the pump head 100 projects vertically from the central cylinder portion 151. A foaming unit 130 is mounted inside the pump head 100, and a stem 40 that moves up and down in the cylinder member 20 is connected and fixed to the lower portion of the pump head 100. The liquid discharge valve 7 is provided inside the stem 40.
0 is provided, and the second piston 60 that slides airtightly on the inner peripheral surface of the large-diameter cylinder portion 22 is provided on the outer peripheral portion of the stem 40.
Is attached. A second air intake valve 90 is attached to the second piston 60. A first piston 50 that slides in a liquid-tight manner on the inner peripheral surface of the small-diameter cylinder portion 24 is connected to a lower portion of the stem 40, and the lower side of the first piston 50 is connected to the stem 40 and the first piston 50. A liquid suction valve 30 that operates to open and close the connection cylinder 25 is provided.

Each structure will be described in detail below. The liquid suction valve 30, the coil spring 39, and the first piston 50 are housed in the small-diameter cylinder portion 24 of the cylinder member 20. The lower end of the liquid suction valve 30 is formed in a lower valve body 31 that can be seated on and separated from a valve seat 24a formed of a tapered surface formed on the lower end of the small-diameter cylinder portion 24.
Open and close 5.

A plurality of engaging pins 32 projecting outward are provided above the lower valve body 31 of the liquid suction valve 30, and the engaging pins 32 are provided at the lower end of the small diameter cylinder portion 24. It is vertically movably inserted between the plurality of vertical ribs 26.

The liquid suction valve 30 has a large diameter portion 33 above the engagement pin 32, and a small diameter portion 34 is connected to the upper portion of the large diameter portion 33. Vertical grooves 33 extending in the vertical direction are formed on the outer peripheral surface of the large diameter portion 33 and the outer peripheral surface of the small diameter portion 34, respectively.
a and 34a are formed. The upper end of the liquid suction valve 30 connected to the small-diameter portion 34 is a tapered cylindrical upper valve body 35 whose diameter increases as it goes upward.

The first piston 50 is in the shape of a hollow cylinder whose upper and lower sides are open, and the lower part thereof is a seal portion 51 which slides liquid-tightly on the inner peripheral surface of the small diameter cylinder portion 24. The peripheral edge of the upper opening is a valve seat 52.

The upper valve body 35 of the liquid suction valve 30 projects upward from the upper opening of the first piston 50,
Can be seated on and separated from the valve seat 52, and opens and closes the upper opening of the first piston 50.

In the first piston 50, a small diameter portion 34 of the liquid suction valve 30 is usually provided in the first piston 50 as shown in FIG.
It is inserted with a sufficient gap between it and the inner peripheral surface of
As shown in FIG. 2, when the pump head 100 is pushed down to lower the stem 40, the large diameter portion 3 of the liquid suction valve 30 is
3 is capable of entering with a slight gap between it and the inner peripheral surface of the first piston 50, and in that case, the vertical groove 33a secures the liquid flow path.

The coil spring 39 is used for the cylinder member 2.
It is provided between the upper end of the vertical rib 26 at 0 and the first piston 50, and urges the first piston 50 upward.
On the other hand, the engagement pin 32 of the liquid suction valve 30 can be hooked on the lower end of the coil spring 39 from below, thereby restricting the upper limit of upward movement of the liquid suction valve 30.

The stem 40 is in the shape of a cylinder whose top and bottom are open, and is housed in the large diameter cylinder portion 22 and the small diameter cylinder portion 24 so as to be vertically movable. At the bottom of the stem 40 is the first
The upper part of the piston 50 is inserted and fixed, and the stem 40
The seal portion 51 is projected from the lower portion of the.

A liquid discharge valve 70 constituted by the check valve of the present invention is provided on the upper inside of the stem 40. The liquid discharge valve 70 uses the interior of the stem 40 as a liquid passage, and includes a valve seat member 41 protruding from the inner wall of the stem 40, and a valve body 71 arranged above the valve seat member 41 (downstream side). .

As shown in FIG. 5, the valve seat member 41 has a horizontal portion 41a which protrudes substantially vertically inward from an upper inner wall of the stem 40, and an upper portion (downstream side) bent substantially at right angles from the tip of the horizontal portion 41a. The vertical portion 41b extends in the form of an annular body having a substantially L-shaped cross section, and the inner peripheral surface of the tip of the vertical portion 41b is formed into a tapered valve seat 41c.

Inside the stem 40 and above the valve seat member 41 is a gas-liquid mixing chamber 46, and inside the valve seat member 41 is a flow path to the gas-liquid mixing chamber 46. The valve body 71 is made of resin, has a spherical shape, is movably accommodated in the gas-liquid mixing chamber 46, and can be seated on and separated from the valve seat 41c. The valve body 71 is seated on the valve seat 41 to prevent liquid and air from flowing back below the valve seat 41, and is separated from the valve seat 41 to allow liquid to flow from the lower side of the valve seat member 41 to the gas-liquid mixing chamber. 46
Allow it to flow in.

A plurality of vertical ribs 42, which extend in the vertical direction, extend around the inside of the stem 40 and extend from above the portion where the first piston 30 is fixed to the horizontal portion 41a of the valve seat member 41. It is provided dispersed in the direction. Inside the vertical rib 42, as shown in FIG.
When 0 is pushed down to lower the stem 40, the upper valve body 35 and the small diameter portion 34 of the liquid suction valve 30 are allowed to enter. At that time, between the vertical ribs 42 and the small diameter portion 34 of the liquid suction valve 30. The vertical groove 34a in FIG.

The pump head 100 connected to the upper portion of the stem 40 is in the shape of a top cylinder in which an outer cylinder part 101, an inner cylinder part 102 and a top plate part 103 are integrally formed. A jet outlet 104 is opened at one side of the upper portion of the outer tubular portion 101, and the jet outlet 104 is connected to the inner tubular portion 102 via a foam passage 105 formed inside the upper portion of the pump head 100. Inside the inner tubular portion 102, a foaming unit 130 is housed and fixed in an upper portion thereof, and an upper portion of the stem 40 is inserted and fixed in a lower side of the foaming unit 130.

The inner peripheral surface of the inner cylindrical portion 102 and the stem 4
A plurality of vertical grooves 1 extending in the vertical direction are provided in the area where 0 is fitted.
02a are distributed in the circumferential direction. This flute 1
The upper end of 02a extends slightly above the upper end of the stem 40, and the vertical groove 102a functions as an air flow path. A lower end portion of the inner tubular portion 102 is formed thin to form a tubular valve body 102b.

The foaming unit 130 is composed of a hollow cylindrical casing 131 having upper and lower openings, and two foaming elements 132 mounted on the casing 131. The casing 131 has a large diameter portion 131a on the upper side and a small diameter portion 131b on the lower side. The large diameter portion 131a is inserted and fixed inside the inner cylindrical portion 102, and the small diameter portion 131b has a gap in the stem 40 in the radial direction. Has been inserted.
A gap is also provided between the bottom of the large diameter portion 131a and the upper end of the stem 40, and these gaps function as air flow paths.

The foaming element 132 is constructed by attaching a net 133 to one end opening of a cylindrical body which is opened at the upper and lower sides, and the foaming element 132 arranged on the lower side in the casing 131 has a mesh at the lower opening of the cylindrical body. 133 is attached, and in the foaming element 132 arranged on the upper side in the casing 131, the net 133 is attached to the upper opening of the cylindrical body 132a.

A plurality of vertical grooves extending upward from the lower end surface of the small diameter portion 131b of the casing 131 are formed on the inner peripheral surface of the lower portion, and the valve body 71 of the liquid discharge valve 70 has a small diameter portion 131.
Even when it hits the lower end of b, the flow paths of liquid and air can be secured.

An annular flange portion 43 that projects outward is formed at the outer periphery of the stem 40 and approximately in the middle in the vertical direction, and an annular standing wall 44 is formed on the upper surface of the flange portion 43.
Is projected upward. The inner peripheral surface of the standing wall 44 is formed into a tapered surface whose diameter increases as it goes upward.

A second piston 60 is fitted on the stem 40 between the flange portion 43 and the pump head 100 so as to be slightly movable up and down. The second piston 60 has a hollow cylindrical shape with an opening at the top and bottom, and the outermost portion is a seal cylinder portion 6 that airtightly slides on the inner peripheral surface of the large diameter cylinder portion 22 of the cylinder member 20.
1, the innermost part is formed in a base cylinder part 62 on which the stem 40 is fitted, and a seal cylinder part 61 and a base cylinder part 6 are formed.
2 are connected by a stepped tube portion 63 whose cross section is bent in a stepwise manner.

The upper portion of the base tubular portion 62 is airtightly slidably pressed against the inner peripheral surface of the tubular valve body 102b of the pump head 100. Air holes 64 are dispersedly provided in a circumferential direction in a connecting portion between the base cylinder portion 62 and the stepped cylinder portion 63, and the air holes 64 are formed by relative vertical movement of the pump head 100 and the second piston 60. Open and close. That is, the pump head 100
And the second piston 60 move up and down relatively, and when the tubular valve element 102b of the pump head 100 hits the connecting portion of the base tubular portion 62 and the stepped tubular portion 63, the air hole 64 is blocked and the tubular When the valve body 102b is separated from the connecting portion, the air hole 64 is opened.

The lower end of the base tube portion 62 comes into contact with and separates from the inner peripheral surface of the standing wall 44 of the stem 40 by the relative vertical movement of the stem 40 and the second piston 60. A plurality of vertical grooves 45 extending in the vertical direction are provided in a circumferentially dispersed manner on the outer peripheral surface of the stem 40 where the base tube portion 62 is fitted. The lower end of the base tube portion 62 of the vertical groove 45 is the standing wall 4 of the stem 40.
4 is communicated with the inside of the large-diameter cylinder portion 22 and is cut off from the inside of the large-diameter cylinder portion 22 when the lower end of the base cylinder portion 62 contacts the standing wall 44.

A second air intake valve 90 is provided below the base tube portion 62.
Has been fixed. The second air intake valve 90 includes an upwardly tapered annular diaphragm 91 that extends radially outward from the lower end thereof. This diaphragm 91 has elasticity, and normally the outer peripheral edge of the diaphragm 91 is brought into pressure contact with the lower surface of the stepped cylinder portion 63 of the second piston 60 to seal, and the negative pressure in the large-diameter cylinder portion 22 causes The outer peripheral edge of the diaphragm 91 is pulled downward and operates so as to be separated from the stepped cylindrical portion 63.

By the way, the mounting cylinder 150 has a central cylindrical portion 151.
Has a cylindrical rib 152 on the outer side of the cylindrical rib 1
A first air intake valve 80 that seals between the mounting cylinder 150 and the inner peripheral surface of the large diameter cylinder portion 22 is fixed to the lower end of 52. First suction valve 8 that abuts the large-diameter cylinder portion 22
The seal tubular portion 81 of 0 has a tapered tubular shape, extends obliquely upward, and has elasticity, and the upper end portion of the seal tubular portion 81 is pulled inward in the radial direction due to the negative pressure in the container body 1. It operates so as to be separated from the inner peripheral surface of the large diameter cylinder portion 22.

In the bubble jet pump 10, all members except the coil spring 39 made of metal are made of synthetic resin.

<Operation> Next, the operation of the container with the foam jet pump will be described. 1 and 3 show a pump head 100.
Is the state before pushing down, that is, the pump head 10
In this state, 0 is located at the upper limit. When ejecting bubbles, first, the transparent cover 20 that covers the mounting cylinder 150.
Remove 2.

In the state before the pump head 100 is pushed down, the liquid suction valve 30 is pushed up by the coil spring 39 via the first piston 50, and the lower valve body 3
1 is separated from the valve seat 24a of the cylinder member 20,
The inside of the small-diameter cylinder portion 24 is in communication with the inside of the container body 1 via the suction pipe 201. The upper valve body 35 of the liquid suction valve 30 is seated on the valve seat 52 of the first piston 50 and closes the upper opening of the first piston 50. Second piston 6
The lower end of the base tubular portion 62 of 0 abuts on the upstanding wall 44 of the stem 40, and the first air intake valve 80 is in pressure contact with the stepped tubular portion 63 of the second piston 60 and the large diameter cylinder portion 22 of the cylinder member 20, The lower end of the tubular valve body 102b of the pump head 100 is separated from the stepped tubular portion 63 of the second piston 60, and the air hole 6
4 is open.

When the pump head 100 is pushed down from this state, the stem 40 and the first piston 50 descend together with the pump head 100, and as a result, the valve seat of the first piston 50 as shown in FIG. 52 to liquid suction valve 30
The upper valve element 35 is separated, and the upper opening of the first piston 50 is opened. Almost at the same time, the inside of the small diameter cylinder portion 24 is pressurized by the lowering of the first piston 50, the liquid suction valve 30 is lowered by the hydraulic pressure in the small diameter cylinder portion 24, and the lower valve body 31 is seated on the valve seat 24a. The lower opening of the small diameter cylinder portion 24 is closed. On the other hand, the second piston 6
0 is stopped by the frictional force between the seal cylinder portion 61 and the large-diameter cylinder portion 22 immediately after the pump head 100 is pushed down.
The lower end of the base tubular portion 62 of the piston 60 is separated from the standing protrusion 44 of the stem 40, and the tubular valve element 10 of the pump head 100 is
The lower end of 2b abuts the stepped cylinder portion 63 of the second piston 60 to close the air hole 64.

After the lower end of the tubular valve body 102b of the pump head 100 hits the stepped tubular portion 63 of the second piston 60, the second piston 60 is also integrated with the pump head 100, the stem 40 and the first piston 50. And then descend.

After that, when the pump head 100 descends, the liquid in the small diameter cylinder portion 24 pressurized by the first piston 30 flows through the upper opening of the first piston 30 and the vertical grooves 33a, 34a of the liquid suction valve 30. Through the vertical ribs 42 of the stem 40 and pushed out above the upper valve body 35, and further the liquid pressure pushes up the valve body 71 of the liquid discharge valve 70 from the valve seat 41c into the gas-liquid mixing chamber 46. Inflow (see FIG. 2). On the other hand, the air contained in the large-diameter cylinder portion 22 passes between the flange portion 43 and the standing protrusion 44 of the stem 40 and the lower end of the base cylinder portion 62 of the second piston 60, and passes through the vertical groove 45 of the stem 40. Through the pump head 10
The gas flows into the gas-liquid mixing chamber 46 through the vertical groove 102a of the inner tubular portion 102 at 0, and further through the passage between the casing 131 of the foaming unit 130 and the stem 40.

Then, the liquid and air are merged and mixed in the gas-liquid mixing chamber 46 and sent to the foaming unit 130.
Then, when the liquid passes through the upper and lower two nets 133 of the foaming unit 130, the liquid is foamed, is extruded in the foam passage 105 of the pump head 100 in a foam state, and is ejected from the ejection port 104 of the pump head 100.

When the pump head 100 is pushed down and the finger is released from the pump head 100, the small diameter cylinder portion 2
4 and the air pressure in the large-diameter cylinder portion 22 are reduced, and the valve body 71 of the liquid discharge valve 70 is seated on the valve seat 41c.
Due to the elasticity of the coil spring 39, the first piston 5
0, the stem 40, and the pump head 100 are pushed upward.

Here, the second piston 60 has the stem 40
Immediately after the start of pushing up, it is stopped by the frictional force between the seal cylinder portion 61 and the large diameter cylinder portion 22, and as a result of the stem 40 rising in that state, the inner peripheral surface of the upstanding projection 44 of the stem 40 causes the second piston 60 to move. Is pressed against the lower end of the base tube portion 62 of
The inside of the large-diameter cylinder portion 22 and the vertical groove 45 of the stem 40 are cut off from each other. At the same time, the lower end of the tubular valve element 102b of the pump head 100 is provided with the stepped tubular portion 63 of the second piston 60.
And the air hole 64 is opened.

After the inner peripheral surface of the upright projection 44 hits the lower end of the base tube portion 62, the first piston 50 and the stem 40
Then, the second piston 60 and the pump head 100 rise together.

When the first piston 50 rises, the inside of the small-diameter cylinder portion 24 is negatively pressured, whereby the liquid suction valve 30 is pulled up and the lower valve body 31 is separated from the valve seat 24a.
The inside of the small diameter cylinder portion 24 communicates with the inside of the container body 1. As a result, the liquid in the container body 1 is sucked up into the small diameter cylinder portion 24 as the first piston 50 rises.

When the liquid is pumped up into the small-diameter cylinder portion 24, the inside of the container body 1 is negatively pressured.
The seal cylinder portion 81 of the air intake valve 80 has the large diameter cylinder portion 22.
Is attracted in a direction away from the inner peripheral surface of the, and a gap is created between the inner peripheral surface and the large-diameter cylinder portion 22.

Further, as the second piston 60 rises, the inside of the large-diameter cylinder portion 22 also becomes negative pressure, which causes the diaphragm 91 of the second air intake valve 90 to be pulled downward.
The second piston 60 is separated from the stepped cylinder portion 63 to form a gap.

First air intake valve 80 and second air intake valve 9
As a result of 0 operating in this manner, outside air is introduced between the central cylinder portion 151 of the mounting cylinder 150 and the pump head 100.
It is sucked into 50. Then, a part of the air enters the large-diameter cylinder portion 22 through the air hole 64 of the second piston 60, and the other air enters the container body 1 through the air hole 27 of the flange portion 21 of the cylinder member 20. enter. As a result, the inside of the large-diameter cylinder portion 22 and the inside of the container body 1 become equal in pressure to the atmospheric pressure, the first piston 50 and the second piston 60 are smoothly raised, and the liquid is pumped up into the small-diameter cylinder portion 24. Is done smoothly.

The stem 40 of the bubble jet pump 10 is manufactured by injection molding synthetic resin.
The valve seat member 41 provided at the horizontal portion 41a has a horizontal portion 41a that projects substantially vertically from the inner wall of the stem 40.
Since the valve seat 41c is provided at the tip portion of the vertical portion 41b that is bent almost at a right angle from the tip of the valve, there is a "sink" attracted to the inner wall side of the stem 40 when the resin forming the valve seat member 41 is cooled and solidified. Even if it occurs, it has almost no effect on the valve seat 41c, and the sealing performance when the valve body 71 is seated on the valve seat 41c is not impaired. Therefore, when the liquid discharge valve 70 is closed, the airtightness is extremely good, and high pump performance can be obtained.

[Second Embodiment] FIGS. 6 and 7 are longitudinal sectional views of a container with a pump provided with a check valve structure of the present invention.

<Structure> First, the structure of the pump-equipped container will be described. This container with a pump is configured by attaching a resin pump 400 to the mouth tube portion 301 of the container body 300, and the container body 300 contains a liquid such as shampoo. The pump 400 is a pump that pours out the liquid in a liquid state, rather than ejecting the liquid in the form of foam like the pump in the first embodiment.

The pump 400 includes a cylinder member 410,
Liquid suction valve 420, valve control member 430, and stem 440
, Pump head 450, and liquid discharge valve (check valve) 460
A mounting cylinder 470 and a mounting cylinder cover 480.

The cylinder member 410 has a cylindrical shape, and the inside thereof is a liquid chamber. The cylinder member 410 has a flange portion 411 on an upper portion thereof, and the engagement cylinder 41 extends from the flange portion 411.
2 stands up and has an open top. A connection tube 413 is provided at the lower end of the cylinder member 410. A spring receiving seat 414 and a valve seat 415 are formed on the inner peripheral surface of the lower portion of the cylinder member 410.
An air hole 417 is formed in the lower part of 11.

This cylinder member 410 has a mouth tube portion 301.
Is inserted into the container body 300 from above, and the packing 416 and the flange portion 411 are placed on the mouth tube portion 301, and the mouth tube portion 3
It is fixed to the container body 300 by a mounting cylinder 470 screwed with 01.

A suction pipe 418 is connected to the connecting cylinder 413 of the cylinder member 410, and the lower end of the suction pipe 418 extends to the bottom of the container 300. A stem 440 is vertically movably inserted into the cylinder member 410, and an upper portion of the stem 440 projects upward from an upper opening of the cylinder member 410. The lower portion of the stem 440 is formed into a cylindrical piston 441 that slides in a liquid-tight manner on the inner peripheral surface of the cylinder member 410.

Inside the cylinder member 410, the valve seat 4
A spherical liquid suction valve 420 is accommodated above the valve seat 15 such that the valve seat 415 can be seated on and separated from the valve seat 415. Further, a valve regulating member 430 is attached inside the cylinder member 410 and above the spring receiving seat 414. The valve regulating member 430 includes an outer cylinder portion 431 and a shaft portion 432 provided inside the outer cylinder portion 431. The lower end of the outer cylinder portion 431 is placed on the spring receiving seat 414, and the coil is arranged between the stem 440. It is pressed downward by the spring 433 and fixed to the cylinder member 410.

The outer cylinder portion 431 is provided with a plurality of circulation holes 434, and liquid can pass through the circulation holes 434. A coil spring 435 for urging the liquid suction valve 420 downward is provided between the liquid suction valve 420 and the valve restricting member 430 so that the liquid suction valve 420 can be quickly seated on the valve seat 415. ing.

The lower end of the shaft portion 432 of the valve restricting member 430 projects below the lower end of the outer cylindrical portion 431, so that the liquid suction valve 420 is not separated from the valve seat 415 more than necessary.
The movement range of the liquid suction valve 420 is limited.

A liquid discharge valve 460 constituted by the check valve of the present invention is provided on the upper inside of the stem 440. The liquid discharge valve 460 uses the interior of the stem 440 as a liquid passage, and includes a valve seat member 442 protruding from the inner wall of the stem 440 and a valve body 461 arranged above the valve seat member 442 (downstream side). . The structure of the valve seat member 442 is exactly the same as that of the valve seat member 41 of the liquid discharge valve 70 according to the first embodiment, so a detailed description thereof will be omitted. However, a tapered inner surface of the valve seat member 442 is tapered. Valve seat is formed, the inside of the valve seat member 442 is a liquid flow path, and the valve body 461
Sits on and separates from the valve seat to open and close this flow path, preventing liquid from flowing backward through this flow path. Also on the inner peripheral surface of the stem 440, a plurality of vertical ribs 443 having a protruding line are provided below the valve seat member 442.

The mounting cylinder cover 480 is engaged with the engagement cylinder 412 of the cylinder member 410. Mounting cylinder cover 480
Is fixed to the cylinder member 410 by irremovably engaging the lid portion 481 with the engagement tube 412, and the stem 440 is provided inside the stopper tube 482 extending downward from the center of the lid portion 481.
Is penetrating. The lower end of the stopper cylinder 482 has the stem 44.
The stem 440 is prevented from coming out of the cylinder member 410 by hitting 0 and restricting the upward movement of the stem 440.

The piston head 4 is provided on the stem 440.
50 is fixed. The piston head 450 is provided with a nozzle 451 which is connected to the inside of the stem 440,
It is formed so that the liquid that has passed 0 can be poured out from the tip of the nozzle 451.

Also in the case of this pump 400, all the members except the coil springs 433 and 435 made of metal are made of synthetic resin.

<Operation> Next, the operation of this container with a pump will be described. FIG. 6 shows a state before the pump head 450 is pushed down, that is, a state in which the pump head 450 is located at the upper limit.

Before the pump head 450 is pushed down, the liquid suction valve 420 is seated on the valve seat 415 and is in the closed state, and the valve body 461 of the liquid discharge valve 460 is the valve seat member 442.
Is seated on the valve seat of and is closed.

When the pump head 450 is pushed down from this state, the liquid suction valve 420 is seated on the valve seat 415 to maintain the valve closed state, and the liquid pressure increase in the cylinder member 410 causes the valve body 461 of the liquid discharge valve 460 to move. The valve seat separates from the valve seat to open the valve, and the liquid in the cylinder member 410 causes the pump head 450
Is ejected from the nozzle 451.

When the pump head 450 is released after pouring, the pump head 450 is lifted by the elasticity of the coil spring 433 and the valve body 4 of the liquid discharge valve 460 is moved.
61 is seated on the valve seat of the valve seat member 422 to close the valve, and the inside of the cylinder member 410 becomes negative pressure. Due to this negative pressure, the liquid suction valve 420 overcomes the elasticity of the coil spring 435 and rises, separates from the valve seat 415 and opens, and the container 300
The liquid therein is sucked into the cylinder member 410 via the suction pipe 418.

When the pump head 450 is raised, the outside air flows into the container body 300 through the air holes 417 of the cylinder member 410, so that the inside pressure of the container body 300 does not become negative.

By the way, the stem 44 of the pump 400
0 is manufactured by injection molding synthetic resin, but the stem 440
Like the valve seat member 41 of the first embodiment, the valve seat member 442 provided in the above has a horizontal portion that projects substantially vertically from the inner wall of the stem 440, and is bent at a right angle from the tip of the horizontal portion. Since the valve seat is provided at the tip of the stem, when the resin forming the valve seat member 442 is cooled and solidified, the stem 44 is
Even if a “sink” that is attracted to the inner wall side of 0 occurs, it has almost no effect on the valve seat, and the sealing performance when the valve body 461 is seated on the valve seat is not impaired. Therefore, when the liquid discharge valve 460 is closed, the airtightness is extremely good, and high pump performance can be obtained.

[0075]

As described above, according to the present invention,
The valve seat member of the check valve is formed by protruding inward from the inner wall of the liquid passage substantially vertically and then bending in the downstream direction.By forming the valve seat at the tip of the valve seat member, the check valve is made of resin. Even if a "sink" occurs in the valve seat member when injection molding is performed, the effect on the valve seat is extremely small and the sealability with the valve body is not hindered.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of a resin pump having a check valve structure of the present invention, showing a state in which a pump head is located at an upper limit.

FIG. 2 is a vertical cross-sectional view of a first embodiment of a resin pump provided with a check valve structure of the present invention, showing a state in which a pump head is pushed down partway.

FIG. 3 is a vertical cross-sectional view showing an enlarged main part of the first embodiment of the resin pump having the check valve structure of the present invention.

FIG. 4 is a vertical cross-sectional view showing an enlarged main part of the first embodiment of the resin pump provided with the check valve structure of the present invention.

FIG. 5 is an enlarged cross-sectional view of the check valve according to the first embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a second embodiment of a resin pump provided with a check valve structure of the present invention, showing a state in which the pump head is located at the upper limit.

FIG. 7 is a vertical cross-sectional view of a second embodiment of a resin pump having a check valve structure according to the present invention, showing a state in which the pump head is pushed halfway.

FIG. 8 is a sectional view of a check valve in a conventional resin pump.

[Explanation of symbols]

 10 Bubble injection pump 41 Valve seat member 41c Valve seat 70 Liquid discharge valve (check valve) 71 Valve body 400 Pump 442 Valve seat member 460 Liquid discharge valve (check valve) 461 Valve body

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location // B29D 31/00 F04B 9/14 B F04B 9/14 21/02 J B29K 23:00 F 59:00

Claims (2)

[Claims] 1. A ring-shaped valve seat member is provided so as to project inward from an inner wall of a liquid passage in a pump made of resin, and the inside of the valve seat member serves as a flow path, and the downstream side of the valve seat member. In the check valve structure in the resin pump in which the valve element disposed on the valve seat is seated on and away from the valve seat of the valve seat member to open and close the flow path, the valve seat member is inwardly and substantially vertically from the inner wall of the liquid passage. A check valve structure in a resin pump, wherein the check valve structure is formed so as to be bent in a downstream direction after protruding, and a valve seat is formed at a tip portion thereof. 2. A rib of a ridge extending along the axial direction of the liquid passage and connected to the valve seat member is provided on the inner wall of the liquid passage on the upstream side of the valve seat member. The check valve structure in the resin pump according to 1.