JPS62158667A - Valve mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a valve mechanism provided in a fluid passage so as to be able to open the passage.

[Technical background of the invention]

Dispensers are generally known and widely used, which are equipped with a pump mechanism that discharges liquid stored in a container body to the outside through a nozzle by pushing down a head portion. In this type of dispenser, the liquid previously stored in the cylinder of the pump mechanism is pumped through the nozzle (by closing the primary valve and opening the secondary valve) by pushing down the head. By the upward movement of the head, the liquid stored in the container body is sucked up into the cylinder by opening the primary valve and closing the secondary valve.

[Problems with background technology]

In such valve mechanisms for the primary and secondary valves, it is difficult to maintain perfect airtightness of the dispenser as a molded product due to deformation of the molded product, sink marks, dimensional errors, etc. It is.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and an object of the invention is to provide a valve mechanism that can maintain good sealing performance.

[Summary of the invention]

In order to achieve the above-mentioned object, the valve mechanism according to the present invention is provided in a fluid passage so as to be able to open the passage, and includes a valve seat and a valve seat that is separably engaged with the valve seat. It comprises a valve body and a biasing member that presses the valve body against a valve seat at a predetermined pressure to close a passage, and the valve seat has a cylindrical inner circumferential surface in a portion still in contact with the valve seat. and a second portion having a surface that intersects the first portion at a predetermined angle, and the valve body has a third portion having an outer circumferential surface in sliding contact with the first portion; It is characterized by comprising a fourth portion having a surface that abuts on the second portion while the first portion and the third portion are in sliding contact.

By configuring the valve mechanism according to the present invention as described above, in the case of a fluid with a low viscosity, since the pipe resistance is small, this fluid can flow between at least the first portion of the valve seat and the valve body. The fluid is sealed by sliding contact with the third part, and in the case of a high viscosity fluid, the pipe resistance increases, so this fluid is sealed between the first part of the valve seat and the third part of the valve body. Sealing is achieved through sliding contact and contact between the second portion of the valve seat and the fourth portion of the valve body, and the sealing performance is maintained well.

[Embodiments of the invention]

Hereinafter, one embodiment of the dispenser according to the present invention will be described in detail with reference to FIGS. 1 to 7 of the accompanying drawings.

As shown in FIG. 2, the dispenser 10 includes a container I2 in which liquid is stored, and a pump mechanism 14 detachably attached to the container I2.

This container 12 includes a container body 18 having an opening 16 formed at the upper end. A handle 20 is attached to one side of the container body 18. Such a container 12 includes a mouth portion 16, a container body 18, and a handle 20.
It is integrally molded from synthetic resin.

On the other hand, as shown in FIG.
It is equipped with A through hole 22a is formed in the center of the cap 22, into which an upper portion of a piston 24 (described later) is inserted.

A housing 2G is attached to the lower surface of this cap 22. This housing 26 has a cylindrical attachment portion 26a that is attached to the cap 22, and a cylindrical attachment portion 26. ] is connected to the lower part, and the mounting is attached to part 26.
Cylinder 26 with a slightly smaller diameter than a:)
and a suction pipe 26d which is provided continuously below the cylinder 26b via a step 26c and has a reduced diameter than that of the cylinder 26b. A plurality of openings 26e are formed in the lower peripheral wall of 26a. This opening 26e functions as a negative pressure prevention hole.The lower end of the suction pipe 26d is connected to the pump mechanism 1 in the container 12.
d extends to the lower part of the container body 18 in the attached state.

A first valve body 28a is provided in the step portion 26c described above so as to control the flow of liquid between the suction pipe 26d and the cylinder 26b.

The inner circumferential surface of this stepped portion 26c functions as a first valve seat 28b that comes into contact with the first valve body 28a. The first valve body 28a and the first valve seat 28b together constitute one notch 28.

This first valve body 28a is moved by its own weight to the first valve seat 28b.
-The yawn 28 is closed. In other words, there is usually one gap 2 between the suction pipe 26d and the cylinder 26b.
8. Then, when the inside of the cylinder 26b becomes negative pressure, the first valve body 28a is pushed up by the liquid sucked up through the suction pipe 26d, and the -yayaku 28 is opened.

A first valve body 2 is provided on the inner peripheral surface of the lower part of the cylinder 26b.
A plurality of guide lips 26f for guiding the cylinder 6a to move in the vertical direction in the figure are provided integrally with the cylinder 26b. These guide ribs 261 extend along the vertical direction and are composed of plates disposed at equal intervals along the circumferential direction.

In addition, in order to prevent the first valve body 28a from popping out upwardly, there is provided at the upper end of each guide lip 261, and when the dispenser 10 is transported, a head 32, which will be described later, is pushed in and the inside of the cylinder 26b is inserted. Sealing member 27 for sealing
is installed. This sealing member 27 is placed on each guide rib 26f and is integrally formed with a support portion 27a formed so as not to block the flow of liquid, and protruding from the center of this support portion 27a. The sealing portion 27b extends upwardly within the cylinder 26b.

A piston 24 is provided within the cylinder 26b so as to be slidable along the direction in which it extends.

The piston 24 includes a pipe-shaped communicating portion 24a that extends vertically in the figure and is open at both upper and lower ends, and is formed at the lower end of the communicating portion 24a, and extends over the entire circumference of the inner circumferential surface of the cylinder 26b. and a piston body 24b that slides into contact with the piston body 24b. The communication portion 24a is connected to the through hole 2 of the cap 22 described above.
It is taken out above the cap 22 via 2a.

Note that a connecting piece 25 is provided in the through hole 22a so as to be located between the cap 22 and the piston 24.

The inner circumferential surface of the connecting piece 25 guides the outer circumferential surface of the communicating portion 24a along the extending direction of the communicating portion 24a, and is spaced apart from the outer circumferential surface of the communicating portion 24a to such an extent that the space between them is not airtight. has been done.

On the other hand, a biasing member 3o that biases the piston 24 upward is provided inside the cylinder 26b. This biasing member 3
0 is a plurality of ribs 2 whose upper ends extend vertically on the inner circumferential surface of the communication portion 24a of the piston 24.
The support portion 27 of the sealing member 27 is in contact with the lower surface of the
It is composed of a coil spring that comes into contact with the upper surface of a.

A nozzle head 32 is attached to the upper end of the communication portion 24a of the piston 24. This nozzle head 32 includes a head section 32a fitted into the outer periphery of the upper end of the communication section 24a, and a nozzle section 32b attached to the side surface of the head section 32a. The head portion 32a has a cylindrical mounting portion 32a fitted to the outer peripheral surface of the communication portion 24a.
, and a head main body 32a which is provided on the upper part of the mounting portion 32a and is pushed in by the operator.

As described above, the nozzle head 32 composed of the head portion 32a and the nozzle portion 32b is integrally made of synthetic resin.
c-molded. This nozzle head 32 is formed with a guide hole 32c that communicates with the communication portion 24a at the mounting portion 32a1 and communicates with the outside at the nozzle portion 32c.

The distance from the base end of the nozzle part 32b to the tip is set to be longer than the distance measured along the horizontal direction from the base end of the nozzle part 32b to the outer peripheral surface of the container 12.

Inside the head portion 323 described above, the piston 24 and the nozzle head 32 are placed on the upper edge of the communication pipe 24a.
A second valve body 34a is provided to control the flow of liquid between the two valves. That is, the upper edge of the communication portion 24a is connected to the second valve body 34a, which functions as the second valve seat 34b.
and the second valve seat 341) together constitute the secondary valve 34.

As shown in FIG. 1, this 217th) valve body 34a includes a cylindrical portion 3dal that contacts the second valve seat 34b, and a cylindrical portion 34=1. The press part 34a2 is connected to the upper part of the press part 34a2 and has a conical inner hole.

More specifically, the second valve seat 34b is adjacent to a tapered surface BJ (which intersects the inner peripheral surface at a predetermined acute angle) formed at the inner peripheral edge of the tip of the communication pipe 24a, and to this tapered surface B1. A cylindrical inner periphery formed inside the communication pipe 24a,
I'm looking forward to it. On the other hand, the second valve body 34a includes an outer peripheral surface that can slide on the inner peripheral surface A, and a tapered surface B2 that can come into contact with the tapered surface B1. A first seal member is formed by the sliding contact between the inner circumference artist and the outer circumference artist, and a second seal member B is formed by the contact between both tapered surfaces Bl and B2.
is configured.

On the other hand, a plurality of elastic plates 32e are formed in a portion of the head portion 32a located above the above-mentioned suppressing portion 34a, hanging down so as to engage with the slope of the inner hole of the pressing portion 34a. has been done. These elastic plates 32e
is integrally formed with the head portion 32a. Also, these elastic plates? 2 e, the lower end of this is the suppressing part 34a
2, the second valve body 34a is always connected to the second valve seat, ? The second valve body 34a is biased downward so as to contact the second valve body 4b and close the secondary valve 34. - When the pressure within the pressurizing chamber 36 defined by the space between the yawn 28 and the secondary valve 34 is set higher than a predetermined pressure, that is, when the pressure within the pressurizing chamber 36 is set higher than the predetermined pressure, the pressure within the pressurizing chamber 36 is When the biasing force of the elastic plate 32e is increased, the second valve body 34a is lifted upward against the biasing force of the elastic plate 32e, and the secondary valve 34 is opened.

Note that the elastic plate 32a is elastically deformed along the slope of the inner hole of the pressing portion 34a when the second valve body 34a is lifted upward.

While the elastic plate 32e is elastically deformed, the second valve body 34a is still urged downward by the elastic plate 34e. Therefore, this second valve body 34
When the force pushing a upward is released, the second
The valve body 34a is pushed down by the urging force of the elastic plate 32e so that it comes into contact with the second valve seat 34b.

Further, a plurality of lock claws 38, three in this embodiment, are mounted on the outer peripheral surface of the mounting portion 32a of the head portion 32m at equal intervals along the circumferential direction. As shown in FIG. 4, the lock pawl 38 is inclined upward at a predetermined angle θ from the base end toward the distal end. The installation of the lock pawl 38 as described above depends on the state, and although the lock pawl 38 is subject to deformation in which it is rotated further upward from its position, it is adapted to resist deformation in which it is pushed down. is being done.

On the other hand, as shown in FIG.
The recess 22b into which the lock pawl 38 is inserted is the lock pawl 38.
It is formed correspondingly. In addition, this flange portion 22C
The mounting position of the head portion 32a is defined so that it is spaced apart from the outer peripheral surface of the portion 32aI by a distance slightly longer than the thickness of the lock claw 38 described above.

Furthermore, an annular engaging portion 24d is formed on the inner circumferential surface of the piston 24, which engages with the upper end of the sealing portion 27b of the sealing member 27 when the piston 24 is pushed down to the lowest position. . Note that the interior of the cylinder 26b is sealed by the engagement between the upper end of the sealing part 27b and the retaining part 24d.

The operation of the die pliers 10 configured as described above will be explained below.

First, the operation of locking the dispenser 10 for transportation, display, etc. will be explained.

That is, in the case of this locking operation, the coil spring 3
The head body 3 of the nozzle head 32 resists the urging force of 0.
2a2 is pushed deeper than the normal discharge operation, so that the lock claw 38 passes through the flange portion 22c of the cap 22 and is positioned below the flange portion 22c, as shown in FIG. . Here, as described above, the lock pawl 38 is allowed to be deformed by being pushed upward. Therefore, the lock claw 38 is inserted into the recess 2.
2b, there is no need to push down the nozzle head 32, and the lock claw 38 can be pushed down at any position, and this pushing down operation is greatly simplified. In this manner, when the nozzle head 32 is pushed down and locked, the engaging portion 24d of the piston 24 and the upper end of the sealing portion 27b of the sealing member 27 engage, and the cylinder 2
The inside of 6b is in a sealed state. In this way, even if the dispenser 10 falls down because the liquid is stored in the container 12 in advance, there is no risk of the liquid leaking from the discharge port 32f of the nozzle part 32b. Releasing the locked state is performed by rotating the nozzle head 32 in the locked state. That is, by rotating the nozzle head 32,
When the lock claw 38 and the recess 22b face each other,
Due to the urging force of the coil spring 30, the nozzle head 3
2, the locking claw 38 passes through the recess 22b and is pushed upward. In this way, the locked state is released. That is, the dispenser 10 becomes ready for dispensing operation.

In the above-mentioned locked state, the nozzle head 32 is locked in a depressed state, so the height of the entire dispenser is limited to be low. In this way, in this locked state, the nozzle part 32-c is made compact without unnecessarily increasing the capacity of the package reservoir of this dispenser flO.

Next, the liquid ejection operation when the nozzle head 32 is unlocked will be described.

First, when the lock is released, the nozzle head 3
2 is pushed upward by the urging force of the coil spring 30. At the same time as this nozzle head 32 is pushed up,
The piston 24 is also pushed up. This piston 24
By pushing up, the pressure inside the pressurizing chamber 36 is reduced.
In this way, the liquid stored in the container body 18 is
- Open the yawn 28 and insert the suction pipe 26 into the pressurizing chamber 36.
Introduced via d.

Then, the operator presses the nozzle head 32 to perform a discharge operation.
When the piston 24 is pushed down, the piston 24 is also pushed down as shown in FIG.
By pressing down, the pressure inside the pressurizing chamber 36 will be increased.

In this way, the liquid pressurized in the pressurizing chamber 36 is pushed by the urging force of the elastic plate 32e, and when the pressure in the pressurizing chamber 36 becomes large, the secondary valve 34 is opened. . Therefore, the liquid in the pressurized chamber 36 passes between the second valve element 34a and the second valve seat 34b of the secondary valve 34, and is passed through the guide hole 32c of the nozzle head 32 to the 7' nozzle. It will be discharged from the tip of 32h.

When a predetermined amount of liquid has been ejected, the operator stops pushing the nozzle head 32 and releases his/her hand from the nozzle head 34. As a result, the nozzle head 34 is freed, the nozzle head 34 and the piston 24 are pushed upward by the urging force of the coil spring 30, and the secondary valve 34 is closed by the urging force of the elastic plate 32e. Therefore, as described above, the pressurizing chamber 36
Introduction of liquid into the interior takes place.

In this way, - times of liquid discharging operations are completed.0 At this point, the secondary valve 34 is in a closed state, but if the viscosity of the liquid is low, the pipe resistance is small, so only the sealer is required. A sufficient sealing effect can be obtained. On the other hand, when the viscosity of the liquid is high, the pipe resistance increases, so that the second valve body 34a continues to be sucked toward the negative pressure side, that is, toward the pressurizing chamber 36 until the suction operation is completed. For this reason,
In the closed state of the secondary valve 34, not only the seal A but also the seal B exhibits a sealing effect, and the two seals A,
Complete occlusion by B is achieved.

Here, each time the discharge operation is performed, the liquid in the container I2 decreases υ, and the pressure in the container 12 gradually decreases. In order to prevent such negative pressure inside the container 12, the C1 negative pressure prevention hole 26e is formed as described above.

The inside of the container 12 flows through the negative pressure prevention hole 26e, and between the communication pipe 24a of the piston 24 and the peripheral edge defining the peripheral edge of the opening 22a of the cap 22. It is communicated with the outside. Therefore, even if the liquid becomes low, there will be no negative pressure inside the container Z2.

Further, the elastic plate 32e that urges the second valve body 34a of the secondary valve 34 is a pressing portion, ? (It engages with the slope of the inner hole of a2. Therefore, the elastic force of this elastic plate 32a is divided by this slope, and the force is significantly reduced. Therefore, this secondary valve At 34, the second valve body 3
4a is realized to be in contact with the second valve seat 34b with extremely small force. In other words, this means that the shutoff pressure of the secondary valve 34 is very small. Therefore, by pushing the nozzle head 32 into the pressurized chamber 3
The secondary valve 34 does not open due to a slight increase in the pressure of the liquid in the nozzle head 32, and the pushing force of the nozzle head 32 is extremely light, improving operability.

Further, the second valve body 34a constituting the secondary valve 34 is always urged by the plurality of elastic plates 32e so as to come into contact with the second valve seat 34b.

, = o 5, even if the dispenser 10 falls down, the liquid in the pressurizing chamber 36 will not leak to the outside via the nozzle head 32, resulting in good operability.

In addition, since this pump mechanism 1a is attached to the mouth part 16 of the container 12, it is not affected by the shape of the container (as long as the shape of the mouth part matches). will also be applied.

It goes without saying that the dispenser of the present invention is not limited to the configuration of the one embodiment described above, and can be modified in various ways without departing from the spirit of the present invention.

For example, in the embodiment described above, the tapered surface B1 was described as intersecting the inner circumferential surface at a predetermined acute angle.
This tapered surface may be set perpendicular to the inner circumferential surface.

〔Effect of the invention〕

As detailed above, the valve mechanism according to the present invention includes a valve seat, a valve body separably engaged with the valve seat, and a valve body that is pressed against the valve seat with a predetermined pressure to close a passage. the valve seat has a first portion having a cylindrical inner circumferential surface at a contact portion with the valve seat, and a surface intersecting the first portion at a predetermined angle. a third portion having an outer circumferential surface in sliding contact with the first portion;
The present invention is characterized by comprising a fourth portion having a surface that abuts on the second portion while the portion and the third portion are in sliding contact with each other.

Therefore, according to the present invention, a valve mechanism that can maintain good sealing performance is provided.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing an embodiment of the valve mechanism according to the present invention, Fig. 2 is a perspective view showing a dispenser using the valve mechanism shown in Fig. 1, and Fig. 3 is shown in Fig. 2. FIG. 4 is a cross-sectional view showing the configuration of the pump mechanism incorporated in the dispenser, FIG. 4 is a cross-sectional view showing the state in which the lock claw is installed, FIG. The figure is a sectional view showing the state of the pump mechanism which pushes in the nozzle head and discharges liquid. A... Seal, person,... Inner circumferential surface, A2... Outer circumferential surface, B... Seal, B... Tapered surface, B2... Tapered surface, 10... Dispenser, 12 ...container, 1
4... Pump mechanism, 16... Mouth part, 18... Container body, 20... Handle, 22... Cap, 22
a...Through hole, 22b...Recess, 22c...Flange part, 24...Piston, 24a...Communication part, 2g b...Piston:/main body, 24c...Rip , 24d・
...Engagement part, 26...No.
26c...Stepped portion, 26d...Suction pipe, 26e.
... Opening, 261 ... Guide lip, 26g ... Locking claw, 27 ... Sealing member, 27a ... Supporting part, 27b.
...Sealing portion, 28... - yawning, 28a... First valve body, 28b... First valve seat, 30... Biasing member (coil spring), 32... Nozzle Head, 32a・
...Head part, 32aI...With mounting part, J2a
1... Head main body, 32b... Nozzle part, 32a
...Guiding hole, 32e...Elastic plate, 34...Secondary valve,
34a...Second valve body, 34a,...Conical part, 34a
2...Press portion, 34b...Second valve seat, 36...
Pressure chamber, 38...lock claw. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 2a Figure 2 Figure 4

Claims (3)

[Claims] (1) In a valve mechanism installed in a fluid passage so as to be able to open the passage, a valve seat, a valve body separably engaged with the valve seat, and a valve body that is applied to the valve seat by applying a predetermined pressure to the valve body. the valve seat includes a first portion having a cylindrical inner circumferential surface at a portion in contact with the valve seat, and a biasing member that closes the passage. a second portion having a surface that intersects at a predetermined angle with the first portion; a fourth portion having a surface that abuts the second portion in a state of contact with the second portion. (2) The valve mechanism according to claim 1, wherein the second surface intersects the first surface at a predetermined acute angle. (3) The valve mechanism according to claim 1, wherein the second surface intersects the first surface at right angles.