WO2023223580A1

WO2023223580A1 - Pump and squirt container

Info

Publication number: WO2023223580A1
Application number: PCT/JP2022/043563
Authority: WO
Inventors: 敏男富永
Original assignee: 株式会社三谷バルブ
Priority date: 2022-05-17
Filing date: 2022-11-25
Publication date: 2023-11-23

Abstract

Provided is a pump that is compact and in which a discharge port does not move.　The upper part of a cylinder 10 is supported, by a body 40, at a position higher than the opening of a container, so that a lower piston seal 21 and an upper piston seal 22 are positioned above the opening of the container. At least a part of a nozzle 60 is positioned within a range, on the outer circumference of the body 40, corresponding to the zone between the lower piston seal 21 and the upper piston seal 22. A through hole 16 is provided to the cylinder 10. The through hole 16 is provided in a range between the positions at which the lower piston seal 21 and the upper piston seal 22 are respectively in contact with the cylinder inner wall in an airtight manner.

Description

pump and squirt container

The present invention relates to a pump that discharges liquid within a bottle.

A pump product that squirts liquid in a bottle has a structure in which a cylinder is fixed to the opening of the bottle, and a piston is inserted from the top end of the cylinder. A push-down part for a user to push down the piston is connected to the upper end of the piston, and the push-down part is generally provided with a discharge port. When the user presses down the push-down part, the piston is pushed down, and when the piston is pushed up to its original position by the spring between it and the cylinder, the liquid in the bottle is sucked up into the cylinder. Next, when the user depresses the push-down part, the liquid in the cylinder is guided from the inside of the piston to the discharge port through a predetermined flow path and is discharged.

As mentioned above, the discharge port is generally provided in the push-down part, so the discharge port moves up and down together with the push-down part and the piston, and when the user presses the push-down part, the operation Along with this, the discharge port also moves downward. Therefore, the position of the ejection port at the time when the liquid is ejected from the ejection port is lower than the position before being pressed down, which is inconvenient if you want to eject from the ejection port at a predetermined position. Therefore, it may be necessary to keep the position of the discharge port constant regardless of the pressing operation.

In response to such a demand, Patent Document 1 discloses a pump in which the discharge port does not move even if the user performs an operation to push down the piston. Specifically, a pump is disclosed in which the upper end of the cylinder extends upward and a discharge port is provided at the upper end of the cylinder. In the pump of Patent Document 1, when the piston is pushed down, the liquid in the cylinder passes through the inside of the piston and is pushed up to the upper end of the upper part of the piston (upper stem D2b), and the upper end of the piston and the cover that covers the upper end of the piston are pushed up. It passes through a gap with a member like this, is pushed out of the piston, and is discharged from the discharge port of the cylinder.

Japanese Patent Application Publication No. 2014-148318

In the pump of Patent Document 1, liquid passes through a gap between the upper end of the upper part of the piston D (upper stem D2b) and a member (lower circumferential wall part 55) like a cover that covers the upper part of the upper stem D2b, and the liquid flows through the upper end of the upper stem D2b. It is pushed out and discharged from the discharge port (nozzle 13) provided in the upper part of the cylinder B (seal tube portion 12). At this time, in order to guide the liquid pushed out to the outside of the upper stem D2b to the nozzle 13, seal members (upper seal portion 59 and a lower seal portion 66) are arranged.

Therefore, in the pump of Patent Document 1, it is necessary to add a lower peripheral wall part 55, an upper seal part 59, and a lower seal part 66 to the upper part of the cylinder B and the piston D, which increases the number of parts and reduces the structure. It's getting complicated. Therefore, production efficiency decreases during manufacturing.

In addition, the pump of Patent Document 1 has the seal cylinder portion 12 extending at the top of the cylinder B and the nozzle 13, so it is larger in height than a normal pump.

An object of the present invention is to provide a pump whose discharge port does not move and is compact.

In order to achieve the above object, the present invention provides the following pump. That is, this pump is a pump that discharges a liquid in a container, and includes a cylinder that has a space inside to store the liquid in the container, a piston whose lower end is inserted into the cylinder, and a piston that supports the cylinder and is connected to the container. It has a body that is attached to the opening, and a nozzle that discharges the liquid inside the cylinder to the outside. The piston has an annular lower piston seal and an annular upper piston seal that are in airtight and slidable contact with the inner wall of the cylinder, and when the pressure in the cylinder exceeds a predetermined pressure, the liquid in the cylinder is transferred to the lower piston. A flow path leading to the space between the seal and the upper piston seal is provided. The body supports the top of the cylinder above the opening of the container such that the lower piston seal and the upper piston seal are located above the opening of the container. The nozzle is located at least partially on the outer periphery of the body in a region corresponding to between the lower piston seal and the upper piston seal. The cylinder is provided with a through hole that connects to the nozzle between the positions where the lower piston seal and the upper piston seal are in airtight contact with the inner wall of the cylinder.

According to the present invention, it is possible to provide a pump whose discharge port does not move and is compact.

FIG. 2 is a sectional view of the pump 1 attached to the container 2 of Embodiment 1. (a-1) Top view, (a-2) sectional view, (b) sectional view at the time of operation, and (c) sectional view at the time of return of the pump 1 of Embodiment 1. FIG. 3 is a sectional view showing the state of the core when the pump 1 of the first embodiment is assembled. (a) A sectional view of the pump 200 attached to the container of Embodiment 2, (b) A sectional view of the pump 300 attached to the container of Embodiment 3, (c) A top view of the pump 300 attached to the container of Embodiment 3. . FIG. 4 is a sectional view of a pump 400 attached to the container 2 of Embodiment 4.

Hereinafter, a pump according to an embodiment of the present invention will be described using the drawings.

<<Embodiment 1>>
The configuration of the pump 1 of this embodiment will be explained using FIG. 1, FIGS. 2(a-1), (a-2), (b), (c), and FIG. 3. 1 is a sectional view of a container 2 equipped with a pump 1, FIGS. 2(a-1) and 2(a-2) are a top view and a sectional view of the pump 1, respectively, and FIG. 2(b) is a piston When the piston 20 is in operation, FIG. 2(c) is a cross-sectional view when the piston 20 returns. FIG. 3 is a sectional view of the cylinder 10 and piston 20 during assembly of the pump 1.

As shown in FIG. 1, the pump 1 is attached to an opening 2a at the top of a container 2 containing a liquid. The pump 1 sucks up the liquid in the container 2, applies pressure, and squirts it out.

As shown in FIG. 2, the pump 1 includes a cylinder 10, a piston 20, a push-down part 30, a nozzle 60, a body 40, and a pipe 50.

The cylinder 10 has a space inside to suck up and store the liquid in the container 2. An opening 13 is provided at the lower end of the cylinder 10 for sucking up the liquid in the container 2. A ball 11 is disposed in the opening 13, which functions as a valve to prevent the liquid in the cylinder 10 from flowing back into the container 2. Further, a pipe 50 for guiding the liquid in the container 2 is connected to the opening 13 at the lower end of the cylinder 10 .

The lower end of the piston 20 is inserted into the cylinder 10. The piston 20 includes an annular lower piston seal 21, an annular upper piston seal 22, a lower piston shaft 23 that pivotally supports the lower piston seal 21, and an upper piston shaft 24 configured integrally with the upper piston seal. ing. Both the lower piston seal 21 and the upper piston seal 22 are in airtight and slidable contact with the inner wall of the cylinder. The lower end of the upper piston shaft 24 is fixed to the upper end of the lower piston shaft 23.

A collar 23a is provided on the outer periphery of the lower piston shaft 23, and a lower elastic member 25 is disposed between the collar 23a and the inner wall near the lower end of the cylinder 10. The lower elastic member 25 urges the lower piston shaft 23 upward against the inner wall of the cylinder 10. An upper elastic member 26 is arranged between the lower piston seal 21 and the upper piston shaft 24. The upper elastic member 26 urges the lower piston seal 21 downward with respect to the upper piston shaft 24. The upper elastic member 26 and the lower elastic member 25 use springs here. The spring constant of the upper elastic member 26 is larger than that of the lower elastic member 25.

When the user pushes the piston 20 downward, the lower piston seal 21 and the upper piston seal 22 descend while sliding on the inner wall of the cylinder 10. At this time, the lower elastic member 25 is compressed without the upper elastic member 26 being compressed. As a result, the space inside the cylinder 10 is compressed by the lower piston seal 21, and when the pressure in the space inside the cylinder 10 exceeds a predetermined pressure, the upper elastic member 26 is pushed up and the lower piston seal 21 moves upward. do. Thereby, as shown in FIG. 2(b), a flow path is formed that connects the space below the lower piston seal 21 and the space above the lower piston seal 21.

The cylinder 10 is supported by the body 40 and attached to the opening of the container 2. Specifically, the body 40 includes an annular mounting part 41 mounted on the outer periphery of the opening of the container 2 and a cylindrical part 42 mounted on the mounting part 41. Here, the mounting portion 41 has a structure that is screwed onto the outer periphery of the opening of the container 2.

The cylinder 10 includes an engaging part 12 at the upper part of the outer circumference, and the engaging part 12 engages with the upper edge of the cylindrical part 42 of the body 40 to support the cylinder 10 within the cylindrical part 42. In this embodiment, the cylindrical portion 42 of the body 40 has a double structure of an inner tube 42a and an outer tube 42b. The inner tube 42a and the outer tube 42b are partially connected. The engaging portion 12 of the cylinder 10 is hooked onto and engaged with the upper edge of the inner cylinder 42a.

Furthermore, the inner wall of the inner cylinder 42a of the cylindrical portion 42 and the outer wall of the cylinder 10 are provided with a recess at one side and a convex portion at the other at corresponding locations 15 (see FIG. 2(b)). The parts are mated. Due to this fitting, the space between the inner wall of the cylindrical portion 42 and the outer wall of the cylinder 10 is sealed.

In this way, by adopting a structure in which the cylindrical part 42 is provided on the mounting part 41 and the engaging part 12 at the upper part of the outer circumference of the cylinder 10 is hooked and engaged with the upper edge of the cylindrical part, , the body 40 supports the upper part of the cylinder 10 at a position higher than the opening of the container 2. Thereby, the cylinder 10 is supported by the body such that the lower piston seal 21 and the upper piston seal 22 of the piston 20 are located above the opening of the container 2. The ball 11 at the lower end of the cylinder 10 is located at the height of the mounting portion 41 of the body 40.

A nozzle 60 is attached to the outer periphery of the outer tube 42b of the cylindrical portion 42 of the body 40 for discharging the liquid inside the cylinder 10 to the outside.

The nozzle 60 is provided on the outer periphery of the outer tube 42b of the cylindrical portion 42 of the body 40. The position where the nozzle 60 is provided is a position corresponding to between the lower piston seal 21 and the upper piston seal 22. A piece 61 is arranged inside the nozzle 60 to narrow a flow path 63 inside the nozzle 60. Thereby, liquid can be ejected from the ejection port 62 at the tip of the nozzle 60.

The cylinder 10 is provided with a through hole 16 that is connected to the nozzle 60. The position where the through hole 16 is provided is a region between the position where the lower piston seal 21 and the upper piston seal 22 are in airtight contact with the inner wall of the cylinder 10.

More specifically, the lower end 21a of the lower piston seal 21 is in airtight contact with the inner wall of the cylinder 10. The through hole 16 of the cylinder 10 may be located above the lower end 21a of the lower piston seal 21 and below the upper piston seal 22. In the example of FIG. 2(a-1), the through hole 16 is located above the lower end portion 21a of the lower piston seal 21. It is located below the upper end of the lower piston seal 21.

The upper end of the body 40 is covered with a bush 43. The upper piston shaft 24 passes through the bush 43 so as to be movable up and down.

A push-down portion 30 is attached to the upper end of the upper piston shaft 24 and receives an operation of pushing the piston downward from the user.

<Operation of each part of pump 1>
The operation of each part when the liquid in the container 2 is ejected by the pump 1 will be explained using FIGS. 1, 2(b), and 2(c).

The mounting portion 41 of the body 40 is fixed around the opening of the container 2 by screwing.

The user presses down the top surface of the push-down section 30. As a result, the piston 20 to which the push-down portion 30 is attached moves downward within the cylinder 10 while compressing the spring 25, as shown in FIG. 2(b).

Since the nozzle 60 is provided in the body 40, the position of the nozzle 60 does not change even if the push-down part 30 and the piston 20 descend.

As the piston 20 descends, the space 17 within the cylinder 10 is compressed, and pressure is applied to the liquid within the space 17. When the pressure in the space 17 becomes greater than the force with which the spring 26 is pushing down the lower piston seal 21, the lower piston seal 21 compresses the spring 26 and is forced upwardly.

As a result, a gap is created between the lower piston seal 21 and the lower piston shaft 23, and the flow path 27 is opened. The liquid in the pressurized space 17 flows all at once from this flow path 27 into the space between the lower piston seal 21 and the upper piston seal 22. Since the cylinder 10 is provided with a through hole 16 between the lower piston seal 21 and the upper piston seal 22, the liquid that has flowed into the space between the lower piston seal 21 and the upper piston seal 22 is transferred to the cylinder 10. The liquid flows into the nozzle 60 through the through hole 16 and is discharged from the discharge port 62.

At this time, since the lower piston seal 21 and the upper piston seal 22 are in airtight contact with the inner wall of the cylinder 10, the liquid that has flowed into the space between the lower piston seal 21 and the upper piston seal 22 leaks in the vertical direction. It is guided to the through hole 16 without any interference.

Since the nozzle 60 has a structure including a top 61 inside, the liquid flowing into the nozzle 60 travels through a narrow flow path 63 between the inner wall of the nozzle 60 and the top 61, and flows into the external space from the discharge port 62 all at once. It is squirted. As a result, a mist of liquid can be ejected from the ejection port 62.

Since the position of the nozzle 60 does not change during ejection, the user can eject a mist of liquid toward the desired position.

When the user releases the push-down part 30, the spring 26 pushes down the lower piston seal 21 and closes the flow path 27, and the spring 25 pushes up the piston 20, and the piston 20 Return.

As a result, the space 17 inside the cylinder is expanded, the space 17 becomes a negative pressure, the ball 11 is pushed up, and the opening 13 at the lower end of the cylinder 10 is opened. As shown by the solid arrow in FIG. 2(c), the liquid in the container 2 is sucked up by the tube 50, passes through the opening 13 at the lower end of the cylinder 10, and fills the space 17 within the cylinder 10. Thereby, the next time the user presses down the push-down part 30, the liquid in the cylinder 10 will be squirted out.

At this time, as shown by the dotted arrow in FIG. An air supply path 44 is provided to provide air. Thereby, as the liquid is sucked up into the cylinder 10, outside air is taken into the container 2, so that the pressure inside the container 2 is maintained at atmospheric pressure.

Note that the position of the nozzle 60 does not change even when the piston 20 returns.

As described above, in the pump 1 of this embodiment, the position of the nozzle 60 does not change when the piston 20 is pushed down to eject liquid from the nozzle 60. This allows the user to easily spray a mist of liquid at a targeted location, for example, when the user wants to spray a medicine or the like toward the back of the throat or toward the scalp.

Moreover, by arranging the upper part of the cylinder 10 above the opening of the container 2 and providing the nozzle 60 in the body 40 at a position corresponding to between the lower piston seal 21 and the upper piston seal 22, the lower piston seal 21 The liquid that has flowed into the space between the upper piston seal 22 and the upper piston seal 22 can be guided to the through hole 16 without leaking in the vertical direction.

Thereby, there is no need to provide a separate sealing member, and the number of parts can be reduced. At the same time, since the nozzle 60 can be placed near the opening of the container 2, it is possible to provide the pump 1 which is compact in the height direction.

Furthermore, since the pump 1 has a small number of parts and a compact structure, the amount of resin required for manufacturing is small, making it possible to provide customers with environmentally friendly products.

In addition, since the lower end of the cylinder 10 is located near the opening of the container 2 and it is not inserted deeply into the container 2, the pump 1 can be attached to a small shallow container 2 to discharge the solution in the container 2. Can be done. Therefore, the pump 1 is also suitable for small containers 2 containing small amounts of liquid. Furthermore, since the small container 2 requires a small amount of resin to manufacture, the use of the pump 1 of this embodiment can be environmentally friendly.

Furthermore, the liquid that has flowed into the space between the lower piston seal 21 and the upper piston seal 22 through the through hole 16 of the cylinder 10 can be moved laterally and guided to the nozzle 60 over the shortest distance. Therefore, the amount of liquid that remains in the nozzle 60 until the next injection can be minimized.

Further, the cylinder 10 and piston 20 of this embodiment can be easily assembled by simply hooking and engaging the engaging portion 12 on the edge of the cylindrical portion 42 of the body 40 after assembling the cylinder 10 and piston 20 to the state shown in FIG. 3 (core state). can be assembled into. Therefore, by assembling the core part in advance and engaging and attaching it to the push-down part 30 and body 40 of the color and shape that the customer desires, the time required to complete the assembly can be shortened. Able to deliver in a timely manner.

<<Embodiment 2>>
The container 2 equipped with the pump 200 of Embodiment 2 will be explained using FIG. 4(a).

The pump 200 of the second embodiment has the same configuration as the pump 1 of the first embodiment, but is a drop-type pump that discharges liquid as droplets instead of atomizing it. Therefore, the spring constant of the upper elastic member 26 and the structure of the nozzle 60 are different from those in the first embodiment.

The spring constant of the upper elastic member 26 of the pump 200 of the second embodiment is smaller than the spring constant of the upper elastic member 26 of the first embodiment. The spring constant of the upper elastic member 26 of the second embodiment is similar to that of the first embodiment in that the spring constant of the lower elastic member 25 is larger. As described above, since the spring constant of the upper elastic member 26 is smaller than that of the first embodiment, the pump 200 of the second embodiment has a pressure threshold in the cylinder 10 that pushes up the lower piston seal 21 to open the flow path 27. It is smaller than the pump 1 of form 1.

Furthermore, in the pump of the second embodiment, the nozzle 60 has a larger space in the internal flow path 63 than in the first embodiment, and the size of the discharge port 62 is also designed to be larger than in the first embodiment.

Therefore, when the pressure inside the pump cylinder 10 of the second embodiment is lower than that of the first embodiment, the lower piston seal 21 is pushed up and the flow path 27 is opened, and the space between the lower piston seal 21 and the upper piston seal 22 is The liquid flows through the through hole 16, passes through the channel 63 whose space inside the nozzle 60 is wider than that in the first embodiment, and is ejected from the ejection port 62 as droplets.

In this way, the present embodiment is a pump that includes the lower elastic member 25 and the upper elastic member 26, so it is different from the mist type pump 1 that spouts a mist liquid as in the first embodiment and the pump as in the second embodiment. A drop type pump 200 that discharges droplets can be realized with the same pump structure by simply changing the spring constant of the upper elastic member 26.

Other configurations, operations, and effects of the pump 200 of the second embodiment are similar to those of the first embodiment, and since the nozzle 60 does not move up and down, the user can discharge droplets toward a desired position.

The other configuration of the pump 200 of the second embodiment is the same as that of the first embodiment, so the explanation will be omitted.

<<Embodiment 3>>
The container 2 equipped with the pump 300 of Embodiment 3 will be explained using FIGS. 4(b) and 4(c).

The pump 300 of the third embodiment is a drop type pump like the pump 200 of the second embodiment, but the nozzle 60 is bent longer than the pump 200 of the third embodiment, and the nozzle 60 is attached to the body 40. It is configured to be rotatable. In the pump 300 of the third embodiment, by rotating the nozzle 60, the central axis of the long nozzle 60 can be directed horizontally or upward.

In the pump 300 of the third embodiment, since the nozzle 60 does not move up and down and is long, the user can bring the discharge port 62 close to a desired position and discharge droplets. It is easy to apply droplets to the position. For example, it is suitable when you want to apply droplets of a medicinal solution to a specific location at the back of your throat.

The other configuration of the pump 300 of Embodiment 3 is the same as that of Embodiment 1, so description thereof will be omitted.

<<Embodiment 4>>
The container 2 equipped with the pump 400 of Embodiment 4 will be explained using FIG. 5.

The pump 400 of the fourth embodiment is a drop-type pump like the second and third embodiments, but the volume of liquid ejected at one time is larger than that of the pump 200 of the second embodiment.

Therefore, the diameter and length of the cylinder 10 are larger than those of the pump 200 of the second embodiment. Other structures are similar to the pump 200 of the second embodiment.

Other configurations, operations, and effects of the pump 400 of the fourth embodiment are the same as those of the pump 200 of the second embodiment, so description thereof will be omitted.

1 Pump 2 Container 2a Opening 10 Cylinder 11 Ball 12 Engagement part 13 Opening 15 locations 16 Through hole 17 Space 20 Piston 21 Lower piston seal 21a Lower end 22 Upper piston seal 23 Lower piston shaft 23a Flange 24 Upper piston shaft 25 Lower elastic member 26 Upper elastic member 27 Channel 30 Push-down section 40 Body 41 Mounting section 42 Cylindrical section 42a Inner tube 42b Outer tube 43 Bush 44 Air supply channel 50 Pipe 60 Nozzle 61 Top 62 Discharge port 63 Channel 200 Pump 300 Pump 400 Pump

Claims

A pump that discharges liquid in a container,
a cylinder having a space therein for storing the liquid in the container;
a piston whose lower end is inserted into the cylinder;
a body that supports the cylinder and is attached to the opening of the container;
and a nozzle for discharging the liquid in the cylinder to the outside,
The piston includes an annular lower piston seal and an annular upper piston seal that are in airtight and slidable contact with the inner wall of the cylinder, and when the pressure in the cylinder exceeds a predetermined pressure, a flow path that guides a liquid into a space between the lower piston seal and the upper piston seal,
The body supports the upper part of the cylinder at a position higher than the opening of the container such that the lower piston seal and the upper piston seal are located above the opening of the container,
The nozzle is at least partially located in a range corresponding to the outer periphery of the body between the lower piston seal and the upper piston seal,
A pump characterized in that the cylinder is provided with a through hole connecting the nozzle between positions where the lower piston seal and the upper piston seal are in airtight contact with the inner wall of the cylinder.
2. The pump according to claim 1, wherein the piston includes a piston shaft that supports the lower piston seal and the upper piston seal, and a lower elastic member that biases the piston shaft upward against the inner wall of the cylinder. , an upper elastic member that biases the lower piston seal downward with respect to the piston shaft,
When the pressure within the cylinder exceeds a predetermined pressure, the upper elastic member is pushed up and the lower piston seal moves upward, thereby connecting the space below and the space above the lower piston seal. , a pump characterized in that the flow path is formed.
2. The pump according to claim 1, wherein the upper end of the piston is equipped with a push-down part that receives an operation of pushing down the piston downward from a user.
The pump according to claim 1, wherein the lower end of the annular lower piston seal is in airtight contact with the inner wall of the cylinder,
A pump characterized in that the through hole of the cylinder is located in a range above the lower end of the lower piston seal and below the upper end of the lower piston seal.
The pump according to claim 1, wherein the body includes an annular mounting part mounted on the outer periphery of the opening of the container, and a cylindrical part mounted on the mounting part,
The pump is characterized in that the cylinder has an engaging part on its outer periphery that engages with an upper edge of the cylindrical part and supports the cylinder within the cylindrical part.
6. The pump according to claim 5, wherein the inner wall of the cylindrical portion and the outer wall of the cylinder are provided with a recess at one corresponding location and a projection at the other, and the recess and the projection fit into each other. A pump characterized in that the inner wall of the cylindrical part and the outer wall of the cylinder are sealed.
2. The pump according to claim 1, wherein the body is provided with an air supply path that allows outside air to be drawn into the container from between an edge of the opening of the container and an outer wall of the cylinder. A pump characterized by:
The pump according to claim 1,
A pump characterized in that a valve is disposed at a lower end of the cylinder to stop backflow of liquid from the inside of the cylinder into the container.
A spouting container having a container and a pump attached to an opening of the container,
An ejection container, wherein the pump is the pump according to any one of claims 1 to 8.