JP7454902B2 - Spring, pump using spring, and ejection container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pump that is attached to the opening of a container and ejects liquid within the container, and particularly to a pump that has a structure in which a spring constituting the pump does not come into contact with the contents.

Most of the parts of a pump that is attached to the opening of a container and squirts out the liquid in the container are generally made of resin, but metal materials are used for the ball valve and spring. Depending on the components of the liquid to be ejected, the liquid may react with metal parts and change its quality. In such a case, it is necessary to change the components of the liquid to those that do not react with the metal parts, which is an inconvenience for the manufacturer.

Patent Document 1 proposes a pump that is designed so that metal parts are not disposed in a liquid passage. The pump is a drug dispenser, usually located inside a cylinder, and a spring that pushes up the piston is located outside the cylinder and piston. In addition, in order to prevent external dust, foreign matter, and bacteria from entering the medicine dispenser during the medicine dispensing process, the upper end of the piston is a separate member from the lower part of the piston. A second spring is placed between them. As a result, when the medicine is not ejected from the ejection port, the second spring pushes up the upper end member of the piston, and the ejection port is closed.

Japanese Patent Application Publication No. 2014-193338

By arranging the spring outside the cylinder as in Patent Document 1, it is possible to avoid the phenomenon that the spring is corroded by the chemical inside the cylinder. However, when the pump is used in an environment with high outside air humidity or an atmosphere containing volatile chemicals, the spring corrodes even if it is disposed outside the cylinder.

Furthermore, if all parts of the pump, including the spring, can be made of the same resin (for example, polypropylene) without using metal, recycling efficiency can be improved and environmental impact can be reduced. Therefore, springs made of resin are desired.

On the other hand, the spring that pushes up the piston needs to push the piston up with a predetermined restoring force in order to suck up the liquid into the cylinder. In order to generate this restoring force, it is necessary to use a spring with a spring constant greater than a predetermined value, and it is necessary to use a spring whose natural length is long to some extent.

As disclosed in FIG. 2 of Patent Document 1, the coil-shaped spring disposed outside the cylinder and around the outer periphery of the piston portion has a larger diameter than the spring disposed inside the cylinder, and the spring length is It is long, and there is no tube to guide the outer circumference of the spring. Therefore, when compressed, the spring tends to deform and spread outward, and the force tends to be dispersed in a direction other than the vertical direction. Furthermore, during the assembly process of the pump during manufacturing, the spring tends to come off from the connection with the piston.

An object of the present invention is to provide a pump that can efficiently push up a cylinder using a resin spring.

In order to achieve the above object, the present invention provides a pump including a spring including first and second ring-shaped members arranged opposite to each other and two or more flexible columnar members. Ru. The first and second ring members and the two or more columnar members are both made of resin. The columnar member is curved along the circumferential direction of the first and second ring-shaped members while being inclined with respect to the axial direction of the first and second ring-shaped members. Both ends are fixed to first and second ring-shaped members, respectively. A first fixing position from a first fixing position where one end of the columnar member and the first ring-shaped member are fixed to a second fixing position where the other end of the columnar member and the second ring-shaped member are fixed. The circumferential angle of the second ring-shaped member is smaller than 2π.

According to the present invention, it is possible to provide a pump that can efficiently push up a cylinder using a resin spring.

(a) A sectional view when the ejection container 1 of the embodiment is at rest, and (b) a sectional view when it is in operation. (a) A side view of the spring 40 of the embodiment, (b) a sectional view of the nozzle 22, and (c) a sectional view of the pump with the spring 40 and nozzle 22 removed. (a) to (f) hexagonal views and (g) a perspective view of the spring 40 of the embodiment. (a) to (f) hexagonal views and (g) a perspective view of a spring 40 of modification 1. (a) to (f) six-sided views and (g) a perspective view of a spring 40 of modification 2-1. (a) to (f) hexagonal views and (g) a perspective view of a spring 40 of modification 2-2. (a) to (f) hexagonal views and (g) a perspective view of a spring 40 of modification 3-1. (a) to (f) six-sided views and (g) a perspective view of a spring 40 of modification 3-2. (a) to (f) hexagonal views and (g) a perspective view of a spring 40 of modification 4. (a) to (f) hexagonal views and (g) a perspective view of a spring 40 of modification 5. (a) to (f) hexagonal views and (g) a perspective view of a spring 40 of modification 6.

An embodiment of the present invention will be described below.

<<<Embodiment>>>
1(a) and (b) are sectional views of the entire ejection container 1 of the embodiment, and FIG. 2(a) shows the spring 40 (one stage and three stages stacked) of the ejection container 1, and 2(b) is a sectional view of the nozzle 22, and FIG. 2(c) is a sectional view of the pump 2 with the nozzle 22 and spring 40 removed.

<<Overall configuration of ejection container 1>>
As shown in FIG. 1, the ejection container 1 includes a container 10 having an opening 11 and a pump 2 for ejecting the contents of the container 10.

The pump 2 includes a cylinder 30, a piston 20, a cylinder bush 31, and a nozzle 22, as shown in FIG. 2(c). The cylinder 30 has an opening at the top, and the lower end of the piston 20 is inserted into the opening of the cylinder 30. The piston includes a lower piston 20a, a piston outer cylinder 20b placed over the upper part of the lower piston 20a, and a piston valve 20c fixed to the lower part of the piston outer cylinder 20b.

The annular cylinder bush covers the space around the piston 20 at the opening of the cylinder 30.

The nozzle 22 is attached to the upper end of the piston outer cylinder 20b of the piston 20.

A cylinder 70 that forms an annular space around the piston 20 is mounted on the top of the annular cylinder bush 31 . A spring 40 is disposed within the cylinder 70 to urge the nozzle 22 upward. That is, the piston 20 penetrates the center space of the spring 40. A plurality of springs 40 may be stacked as shown in FIGS. 1(a), (b) and 2(a), or only one spring 40 may be stacked as shown in FIG. 2(a).

<<Spring 40>>
The structure of the spring 40 will be explained using FIG. 3.

3(a) to 3(f) are hexagonal views of the spring 40, and FIG. 3(g) is a perspective view of the spring 40.

The spring 40 includes first and second ring-shaped members 41 and 42 that are arranged opposite to each other, and two flexible columnar members 43 and 44. The first and second ring-shaped members 41, 42 and the two columnar members 43, 44 are both made of resin.

The columnar members 43 and 44 are curved along the circumferential direction of the first and second ring-shaped members 41 and 42 while being inclined in the axial direction of the first and second ring-shaped members. , both ends of the columnar members 43, 44 are fixed to the first and second ring-shaped members 41, 42, respectively.

The fixed position between one end (upper end) of the columnar member 43 and the first ring-shaped member 41 is referred to as a first fixed position 43a. The fixed position between the other end (lower end) of the columnar member 43 and the second ring-shaped member 42 is referred to as a second fixed position 43b. The circumferential angle of the first and second ring-shaped members from the first fixed position 43a to the second fixed position 43b is smaller than 2π. In the case of the spring 40 of FIGS. 3(a)-(g), the above angle is about 200 degrees.

Similarly, the fixed position between one end (upper end) of the columnar member 44 and the first ring-shaped member 41 is called a first fixed position 44a, and the fixed position between the other end (lower end) of the columnar member 44 and the second ring-shaped member 41 is called a first fixed position 44a. The fixed position is called the second fixed position 44b. The angle in the circumferential direction of the first and second ring-shaped members from the first fixed position 44a to the second fixed position 44b is smaller than 2π, and in the case of the spring 40 of FIGS. The angle is approximately 200 degrees.

One ends of the two columnar members 43 and 44 are fixed to the first ring-shaped member at equal intervals, and the other ends are fixed to the second ring-shaped member at equal intervals.

When no force is applied to the first and second ring-shaped members 41 and 42, the distance between the first ring-shaped member 41 and the second ring-shaped member 42 is , 42 is preferably 1.5 times or less of the diameter.

As shown in FIG. 1A, the lower surface of the second ring-shaped member 42 of the spring 40 is arranged within the cylinder 70 so as to be in contact with the upper surface of the annular cylinder bush 31. As shown in FIG. Further, the number of stacked springs 40 or the height of the pump 2 is designed so that the upper surface of the first ring-shaped member 41 of the spring 40 comes into contact with a part of the nozzle 22 attached to the upper end of the piston 20. has been done.

Note that in order to stack the springs 40 stably, the axially outer surfaces of the first and second ring-shaped members 41 and 42 (that is, the upper surface of the first ring-shaped member 41 and the upper surface of the second ring-shaped member 42) is preferably a flat surface. However, in the spring 40 of this embodiment, the axially outer surfaces of the first and second ring-shaped members 41 and 42 are not limited to flat surfaces. When a plurality of springs 40 are stacked, the axially outer surfaces of the first ring-shaped member 41 and the second ring-shaped member 42 that contact each other (that is, the upper surface of the first ring-shaped member 41 and the second A fitting portion such as a concave-convex portion into which the ring-shaped member 42 (lower surface of the ring-shaped member 42) is fitted may be provided on at least one of the upper surface of the first ring-shaped member 41 and the lower surface of the second ring-shaped member 42.

Thereby, when the nozzle 22 is pushed down by the user as shown in FIG. 1(b) during operation of the pump 2, the spring 40 is compressed by the nozzle 22. When the user releases the nozzle 22, the restoring force of the spring 40 pushes the nozzle 22 up and returns it to its original position.

As described above, the spring 40 of this embodiment is made of resin, the columnar members 43 and 44 are curved, and the angle along the circumferential direction of the ring-shaped member 41 is smaller than 2π. Also, the length in the axial direction can be shortened (that is, the height can be shortened).

When using a general coiled spring, the height of the pump 2 is determined by the length of the spring, but when using the short spring 40 of this embodiment, it is possible to reduce the height of the pump 2. It is possible. Therefore, the degree of freedom in designing the height of the pump 2 increases.

Further, as shown in FIGS. 1(a), (b) and FIG. 2(a), the spring 40 of this embodiment is provided with ring-shaped members 41 and 42 at the upper and lower ends, so that it can be stacked. Can be used. By changing the number of springs stacked on the pump 2, pumps 2 of various heights can be assembled using the same spring 40.

Further, since the spring 40 includes ring-shaped members 41 and 42 at the upper and lower ends, the columnar members 43 and 44 are difficult to expand outward even when compressed. Therefore, compression or expansion force is difficult to disperse in the radial direction and can be converted into displacement in the axial direction.

Specifically, even if there are two columnar members 43 and 44 arranged and the force applied to the ring-shaped members 41 and 42 is not uniform in the circumferential direction, the ring-shaped members 41 and 42 are deformed into an ellipse. Since the columnar members 43 and 44 are supported, the columnar members 43 and 44 can be prevented from deforming so as to bulge outward.

In addition, even if the ring-shaped members 41 and 42 are deformed into an elliptical shape, the outer and inner diameters of the ring-shaped members 41 and 42 and the material of the resin are adjusted so that they do not touch the piston 20 penetrating the spring 40. Design it in advance. Thereby, a clearance between the piston 20 and the spring 40 can be ensured.

<Structure for making all parts of pump 2 made of resin>
In this embodiment, in order to make not only the spring 40 but also all the parts of the pump 2 made of the same resin, the following structure is adopted.

At the lower end of the cylinder 30, an intake hole 32 for introducing a solution into the cylinder 30 is arranged. A plate-shaped valve 33 is arranged in the intake hole 32 to prevent backflow. The valve 33 is made of resin. This eliminates the need to use metal balls that are typically used as valves.

An annular fixture 3 for attaching the pump 2 to the opening 11 of the container 10 is connected to the lower end of the cylinder 70 . A seal structure 34 is provided at the upper end of the outer periphery of the cylinder 30 to prevent leakage of liquid within the container 10. Specifically, the seal structure 34 includes a minute cylindrical member 34a pressed against the inner edge of the opening 11 and a ring-shaped member 34b pressed against the upper end of the edge of the opening 11. Thereby, there is no need to arrange a generally used elastic member such as rubber inside the fixture 3, and the seal structure 34 can be formed of the same resin material as the cylinder 30 and the like.

Not only the spring 40 but all the members of the pump 2 can be made of the same resin material. For example, since all the members of the pump 2 can be made of polypropylene, there is no need to separate the pump 2 when it is disposed of, and recycling is easy.

<When operating>
Changes in each part of the pump 2 during operation will be explained.

When the nozzle 22 is pushed down by the user from the resting state of FIG. 1(a) as shown in FIG. 1(b), the lower end of the piston 20 to which the nozzle 22 is attached is also pushed down within the cylinder 30. At this time, the springs 40-1 to 40-3 are also compressed.

As the lower end of the piston 20 is pushed down, the pressure inside the cylinder 30 increases, and the liquid inside the cylinder passes through the gap between the lower piston 20a and the piston valve 20c, as shown in FIG. 2(b), to the lower piston 20a. It further passes between the piston outer cylinder 20b and the piston outer cylinder 20b, enters the inside of the piston outer cylinder 20b, and is ejected to the outside through the nozzle 22.

When the user releases the nozzle 22, the restoring force of the springs 40-1 to 40-3 pushes the nozzle 22 up, thereby expanding the space inside the cylinder 30 and reducing the pressure. The liquid in the container 10 is sucked up by the tube 12 and passes through the intake hole 32 and the valve 33 to fill the cylinder 30 .

From then on, FIGS. 1A and 1B are repeated each time the nozzle 22 is pushed down by the user.

In this manner, in the ejection container 1 of this embodiment, since the spring 40 is not disposed within the cylinder 30, there is no fear that the spring 40 will be corroded by the liquid. Moreover, even if the external atmosphere contains volatile chemicals, since the spring 40 is made of resin, there is no risk of corrosion.

Further, since the spring 40 is small and can be stacked and placed inside the pump 2, the length (height) of the spring 40 can be adjusted, and the pump 2 has a high degree of freedom in design.

<<<Modification example 1 of spring 40>>>
A first modification of the spring 40 is shown in FIG.

In the spring 40 of FIG. 4, four reinforcing members 45 to 48 are arranged between two columnar members 43 and 44. One end of the reinforcing members 45 to 48 is fixed to one of the columnar members 43 and 44, and the other end is fixed to another one.

By arranging the reinforcing members 45 to 48 in this manner, it is possible to suppress the two columnar members 43 and 44 from expanding laterally when the spring 40 is compressed.

<<<Modification example 2-1 of spring 40>>>
Modification 2-1 of the spring 40 is shown in FIG.

The spring 40 in FIG. 5 has the same configuration as the spring 40 in FIG. 3, but the angle of inclination of the columnar members 43 and 44 is smaller than that in FIG.

Other configurations and effects are the same as those in the first embodiment, so their explanations will be omitted.

<<<Modification example 2-2 of spring 40>>>
Modification 2-2 of the spring 40 is shown in FIG.

The spring 40 in FIG. 6 has a structure in which four reinforcing members 45 to 48 are arranged between the two columnar members 43 and 44 of the spring in FIG.

By arranging the reinforcing members 45 to 48 in this manner, it is possible to suppress the two columnar members 43 and 44 from expanding laterally when the spring 40 is compressed.

<<<Modification example 3-1 of spring 40>>>
Modification 3-1 of the spring 40 is shown in FIG.

The spring 40 in FIG. 7 has a structure in which three columnar members 143, 144, and 145 are arranged at equal intervals.

<<<Modification 3-2 of spring 40>>>
Modification 3-2 of the spring 40 is shown in FIG.

The spring 40 in FIG. 8 has a structure in which six reinforcing members 146 to 151 are arranged between the three columnar members 143, 144, and 145 of the spring 40 in FIG.

<<<Modification 4 of spring 40>>>
A fourth modification of the spring 40 is shown in FIG.

The columnar members of the spring 40 in FIG. 9 are an even number of four or more (here, four), and half of the columnar members 445 and 446 are inclined in the opposite direction to the other half of the columnar members 443 and 444. , the direction of deviation of the second fixed positions 443b to 446b with respect to the first fixed positions 443a to 446a is set. As a result, half of the columnar members 445, 446 intersect with the other half of the columnar members 443, 444, and are fixed to each other at intersecting positions 450, 451, etc.

As a result, half of the columnar members 445, 446 and the other half of the columnar members 443, 444 mutually act as reinforcing members, and it is possible to suppress the columnar members 443 to 446 from expanding laterally. .

<<<Modification 5 of spring 40>>>
A fifth modification of the spring 40 is shown in FIG.

The columnar members 243 and 244 of the spring 40 in FIG. 10 are plate-like members curved in a shape along the circumferential direction of the first and second ring-shaped members 41 and 42.

A first fixed position 243a is a fixed position between one end (upper end) of the plate-shaped columnar member 243 and the first ring-shaped member 41, and a fixed position between the other end (lower end) of the columnar member 243 and the second ring-shaped member 42. The second fixed position 243b, which is the fixed position of , is at the same angle with respect to the centers of the first and second ring-shaped members 41 and 42. That is, there is a second fixed position directly below the first fixed position 243a.

Further, the plate-shaped columnar members 243 and 244 have a shape that is curved outward with respect to a central axis connecting the center of the first ring-shaped member 41 and the center of the second ring-shaped member 42.

The spring 40 in FIG. 10 can provide the same action and effect as the spring in FIG. 3 and the springs in each modification.

<<<Modification example 6 of spring 40>>>
A sixth modification of the spring 40 is shown in FIG.

The spring 40 in FIG. 11 includes first and second ring-shaped members 41 and 42 that are arranged opposite to each other, and a cylindrical member 343. The first and second ring-shaped members 41 and 42 and the cylindrical member 343 are both made of resin.

Both ends of the cylindrical member 343 are fixed to the first and second ring-shaped members 41 and 42, respectively. The diameter of the cylindrical member 343 changes in the axial direction, being largest at both ends in the axial direction and smallest at the center in the axial direction.

For example, in the example of FIG. 11, the cylindrical member 343 has the largest diameter at both ends, is linearly inclined toward the center, and has the smallest diameter at the center.

Moreover, two or more (four in FIG. 11) notches 343a, 343b are provided in the first and second ring-shaped members 41, 42, respectively.

The cutouts 343a and 343b reach the cylindrical member 343, and the cylindrical member 343 is also cut out.

In the spring 40 of FIG. 11, like the spring of FIG. 3 and the springs of each modification, when the user applies force to the nozzle 22, the cylindrical member 343 is deformed and compressed, and when the user releases the hand, the spring 40 shown in FIG. The restoring force of the spring 40 allows the nozzle 22 to be pushed up.

1 Ejection container 2 Pump 3 Fixture 10 Container 11 Opening 12 Pipe 20 Piston 20a Lower piston 20b Piston outer cylinder 20c Piston valve 22 Nozzle 30 Cylinder 31 Cylinder bush 32 Hole 33 Valve 34 Seal structure 34a Member 34b Ring-shaped member 40 Spring 41 Ring Shaped member 42 Ring-shaped member 43 Column-shaped member 44 Column-shaped member 45 Reinforcement member 70 Cylinder 143 Column-shaped member 146 Reinforcement member 243 Column-shaped member 243a Fixed position 243b Fixed position 343 Cylindrical member 443 Column-shaped member 445 Column-shaped member 450 Intersection position

Claims (18)

A pump attached to a container,
a cylinder having an opening at the top;
a piston whose lower end is inserted into the opening of the cylinder;
an annular cylinder bushing that covers a space around the piston in the opening of the cylinder;
a nozzle attached to the upper end of the piston;
a cylinder that is mounted on the top of the annular cylinder bush and forms an annular space around the piston;
an annular fixture connected to the lower end of the cylinder and attached to the opening of the container;
the cylinder is disposed within the container, the cylinder bushing is located above the opening of the container,
One spring or two or more stacked springs are disposed between the upper surface of the cylinder bush and the nozzle to bias the nozzle upward and a spring is located in the annular space between the cylinder on the cylinder bush and the piston;
One of the springs or at least one of the two or more stacked springs includes first and second ring-shaped members arranged oppositely, and two or more flexible columnar members. including
The first and second ring-shaped members and the two or more columnar members are both made of resin,
The columnar member is curved along the circumferential direction of the first and second ring-shaped members while being inclined with respect to the axial direction of the first and second ring-shaped members; Both ends of the columnar member are fixed to the first and second ring-shaped members, respectively,
From a first fixing position, which is a fixing position between one end of the columnar member and the first ring-shaped member, to a second fixing position, which is a fixing position between the other end of the columnar member and the second ring-shaped member. The angle in the circumferential direction of the first and second ring-shaped members is smaller than 2π,
A reinforcing member is arranged between two or more of the columnar members, and the reinforcing member has one end fixed to one of the columnar members and the other end fixed to another one of the columnar members. A pump characterized by being fixed to. The pump according to claim 1,
When no force is applied to the first and second ring-shaped members, the distance between the first and second ring-shaped members is 1 of the diameter of the first and second ring-shaped members. .5 times or less. including first and second ring-shaped members arranged oppositely and two or more flexible columnar members,
The first and second ring-shaped members and the two or more columnar members are both made of resin,
The columnar member is curved along the circumferential direction of the first and second ring-shaped members while being inclined with respect to the axial direction of the first and second ring-shaped members; Both ends of the columnar member are fixed to the first and second ring-shaped members, respectively,
From a first fixing position, which is a fixing position between one end of the columnar member and the first ring-shaped member, to a second fixing position, which is a fixing position between the other end of the columnar member and the second ring-shaped member. The angle in the circumferential direction of the first and second ring-shaped members is smaller than 2π,
A reinforcing member is arranged between two or more of the columnar members, and the reinforcing member has one end fixed to one of the columnar members and the other end fixed to another one of the columnar members. A spring characterized by being fixed to. including first and second ring-shaped members arranged oppositely and two or more flexible columnar members,
The first and second ring-shaped members and the two or more columnar members are both made of resin,
The columnar member is curved along the circumferential direction of the first and second ring-shaped members while being inclined with respect to the axial direction of the first and second ring-shaped members; Both ends of the columnar member are fixed to the first and second ring-shaped members, respectively,
From a first fixing position, which is a fixing position between one end of the columnar member and the first ring-shaped member, to a second fixing position, which is a fixing position between the other end of the columnar member and the second ring-shaped member. The angle in the circumferential direction of the first and second ring-shaped members is smaller than 2π,
The columnar members are an even number of four or more, half of the columnar members have an inclination direction opposite to that of the remaining half of the columnar members, and the half of the columnar members are opposite to the other half of the columnar members. and intersect with each other and are fixed to each other in the intersecting position. including first and second ring-shaped members arranged oppositely and two or more flexible columnar members,
The first and second ring-shaped members and the two or more columnar members are both made of resin,
The columnar member is curved along the circumferential direction of the first and second ring-shaped members while being inclined with respect to the axial direction of the first and second ring-shaped members; Both ends of the columnar member are fixed to the first and second ring-shaped members, respectively,
From a first fixing position, which is a fixing position between one end of the columnar member and the first ring-shaped member, to a second fixing position, which is a fixing position between the other end of the columnar member and the second ring-shaped member. The angle in the circumferential direction of the first and second ring-shaped members is smaller than 2π,
The columnar member is a plate-shaped member curved in a shape along the circumferential direction of the first and second ring-shaped members,
a first fixing position, which is a fixing position between one end of the plate-shaped columnar member and the first ring-shaped member; and a second fixing position, which is a fixing position between the other end of the columnar member and the second ring-shaped member. A spring characterized in that the fixed position is at the same angle with respect to the centers of the first and second ring-shaped members. 6. The spring according to claim 5, wherein the plate-shaped columnar member is oriented outwardly with respect to a central axis connecting the center of the first ring-shaped member and the center of the second ring-shaped member. A spring characterized by having a shape curved in one direction. 7. The spring according to claim 3, wherein axially outer surfaces of the first and second ring-shaped members are flat. A spring including first and second ring-shaped members arranged opposite to each other and two or more flexible columnar members,
The first and second ring-shaped members and the two or more columnar members are both made of resin,
The columnar member is curved along the circumferential direction of the first and second ring-shaped members while being inclined with respect to the axial direction of the first and second ring-shaped members; Both ends of the columnar member are fixed to the first and second ring-shaped members, respectively,
From a first fixing position, which is a fixing position between one end of the columnar member and the first ring-shaped member, to a second fixing position, which is a fixing position between the other end of the columnar member and the second ring-shaped member. The angle in the circumferential direction of the first and second ring-shaped members is smaller than 2π,
At least one of the axially outer surface of the first ring-shaped member and the axially outer surface of the second ring-shaped member is in contact with each other when a plurality of the springs are stacked. A spring characterized in that a fitting portion is provided for fitting an axially outer surface of the first ring-shaped member and an axially outer surface of the second ring-shaped member. The spring according to any one of claims 3 to 6 and 8, wherein the first ring-shaped member is in a state where no force is applied to the first and second ring-shaped members. A spring characterized in that the distance between the first and second ring-shaped members is 1.5 times or less the diameters of the first and second ring-shaped members. including first and second ring-shaped members arranged oppositely and a cylindrical member,
The first and second ring-shaped members and the cylindrical member are both made of resin,
The cylindrical member has both ends fixed to the first and second ring-shaped members, respectively,
A spring characterized in that the diameter of the cylindrical member changes in the axial direction, and is largest at both ends in the axial direction and smallest at the center in the axial direction. 11. The spring according to claim 10, wherein each of the first and second ring-shaped members is provided with two or more notches,
A spring characterized in that the two or more notches reach the cylindrical member, and the cylindrical member is also cut out. a cylinder having an opening at the top; a piston having a lower end inserted into the opening of the cylinder; an annular cylinder bushing that covers a space around the piston in the opening of the cylinder; and a nozzle;
A cylinder that forms an annular space around the piston is mounted on the upper part of the annular cylinder bush, and a spring that biases the nozzle upward is disposed within the cylinder, and the spring is configured to A pump characterized in that it is the spring according to any one of items 3 to 5, 8, 10, and 11. 13. The pump according to claim 12, wherein the lower surface of the second ring-shaped member of the spring is in contact with the upper surface of the annular cylinder bushing, and the upper surface of the first ring-shaped member is in contact with the upper end of the piston. A pump characterized by being in contact with a part of a nozzle attached to. 13. The pump according to claim 12, wherein a plurality of the springs are stacked and arranged in an annular space around the piston formed by the cylinder, and a second of the springs arranged at the lowest The lower surface of the ring-shaped member is in contact with the upper surface of the annular cylinder bush, and the upper surface of the first ring member of the uppermost spring is in contact with a part of the nozzle attached to the upper end of the piston. A pump characterized by: 13. The pump according to claim 12, wherein an intake hole for taking the solution into the cylinder is arranged at a lower end of the cylinder, a plate-shaped valve for preventing backflow is arranged in the intake hole, and the valve is a pump characterized by being made of resin. 13. The pump according to claim 12, wherein the lower end of the cylinder is connected to an annular fixture for attaching the pump to the opening of the container.
The pump is characterized in that a seal structure is provided at the upper end of the outer periphery of the cylinder to prevent liquid leakage by being pressed against the inner edge of the opening of the container. 13. The pump according to claim 12, wherein all members are made of the same material. A spouting container comprising a container having an opening and a pump attached to the opening of the container,
An ejection container, wherein the pump is the pump according to claim 12.

Images