Pump and discharge container

Abstract

The invention provides a small pump with an immovable discharge port. The upper part of the cylinder (10) is supported by the main body (40) at a position higher than the opening of the container such that the lower piston seal (21) and the upper piston seal (22) are positioned above the opening of the container. At least a portion of the nozzle (60) is located in a range of the outer periphery of the main body (40) corresponding to a space between the lower piston seal (21) and the upper piston seal (22). The cylinder (10) is provided with a through hole (16). The through-hole (16) is provided in a range between positions where the lower piston seal (21) and the upper piston seal (22) are in airtight contact with the inner wall of the cylinder.

Description

Technical Field

[0001] The present invention relates to a pump for discharging liquid from a bottle. Background Art

[0002] The pump product that sprays the liquid in the bottle has a structure in which a cylinder is fixed to the opening of the bottle and a piston is inserted from the upper end. Generally speaking, a pressing portion for the user to press the piston is connected to the upper end of the piston, and a discharge port is provided in the pressing portion. When the user presses down the pressing portion, the piston is pressed, and when the piston is pushed up to the original position by the spring between the piston and the cylinder, the liquid in the bottle is drawn into the cylinder. When the user presses down the pressing portion next time, the liquid in the cylinder is guided from the inside of the piston to the discharge port through a prescribed flow path and discharged.

[0003] As described above, generally speaking, the discharge port is provided at the pressing portion, so the discharge port moves up and down together with the pressing portion and the piston. When the user presses the pressing portion, the discharge port also moves downward with the operation. Therefore, the position of the discharge port at the moment of discharging liquid from the discharge port is lower than the position before pressing, which becomes inconvenient when aiming at a predetermined position to discharge from the discharge port. Therefore, it is sometimes required to keep the position of the discharge port constant regardless of the pressing operation.

[0004] In response to such a requirement, Patent Document 1 discloses a pump in which the discharge port does not move even when the user presses the piston. Specifically, a pump is disclosed in which the upper end of the cylinder body is extended upward and a discharge port is provided at the upper end of the cylinder body. In the pump of Patent Document 1, when the piston is pressed, the liquid in the cylinder body is pushed up to the upper end of the upper part of the piston (upper shaft D2b) through the inside of the piston, and is squeezed out to the outside of the piston through the gap between the upper end of the piston and a member such as a cover covering the upper end of the piston, and is discharged from the discharge port of the cylinder body.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2014-148318 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the pump of Patent Document 1, liquid is squeezed out to the outside of the upper shaft D2b through the gap between the upper end of the upper part of the piston D (upper shaft D2b) and a member (lower peripheral wall portion 55) such as a cover covering the upper part of the upper shaft D2b, and is discharged from a discharge port (nozzle 13) provided in the upper part (sealing cylinder portion 12) of the cylinder body B. At this time, in order to guide the liquid squeezed out to the outside of the upper shaft D2b to the nozzle 13, sealing members (upper sealing portion 59 and lower sealing portion 66) that seal between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder body are arranged above and below the nozzle 13.

[0010] Therefore, the pump of Patent Document 1 needs to add the lower peripheral wall portion 55, the upper seal portion 59, and the lower seal portion 66 to the upper portion of the cylinder B and the piston D, which increases the number of components and complicates the structure. Therefore, the production efficiency is reduced during manufacturing.

[0011] In addition, the pump of Patent Document 1 is provided with the nozzle 13 by extending the sealing tube 12 at the upper part of the cylinder B, and therefore is larger in height direction than a general pump.

[0012] An object of the present invention is to provide a small-sized pump whose discharge port does not move.

[0013] Solutions to Solve Problems

[0014] In order to achieve the above-mentioned object, the present invention provides the following pump. That is, the pump is a pump for discharging liquid in a container, wherein the pump comprises: a cylinder having a space for storing liquid in the container inside; a piston having a lower end inserted into the cylinder; a main body supporting the cylinder and mounted on the opening of the container; and a nozzle discharging the liquid in the cylinder to the outside. The piston comprises: an annular lower piston seal and an upper piston seal, which are in airtight and slidable contact with the inner wall of the cylinder; and a flow path, which guides the liquid in the cylinder to the space between the lower piston seal and the upper piston seal when the pressure in the cylinder exceeds a prescribed pressure. The main body supports the upper part of the cylinder at a position higher than the opening of the container so that the lower piston seal and the upper piston seal are located above the opening of the container. At least a portion of the nozzle is located in a range corresponding to the lower piston seal and the upper piston seal on the outer periphery of the main body. The cylinder body is provided with a through hole connecting the cylinder body and 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 body.

[0015] Effects of the Invention

[0016] According to the present invention, a small-sized pump can be provided in which the discharge port does not move. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a cross-sectional view of the pump 1 attached to the container 2 according to the first embodiment.

[0018] Figure 2 (a-1) is a plan view of the pump 1 according to the first embodiment, (a-2) is a cross-sectional view, (b) is a cross-sectional view during operation, and (c) is a cross-sectional view during resetting.

[0019] Figure 3 This is a cross-sectional view showing a state of the pump core when the pump 1 according to the first embodiment is assembled.

[0020] Figure 4 (a) is a cross-sectional view of a pump 200 mounted on a container according to Embodiment 2, (b) is a cross-sectional view of a pump 300 mounted on a container according to Embodiment 3, and (c) is a top view of a pump 300 mounted on a container according to Embodiment 3.

[0021] Figure 5 This is a cross-sectional view of a pump 400 attached to a container 2 according to a fourth embodiment. DETAILED DESCRIPTION

[0022] Hereinafter, a pump according to an embodiment of the present invention will be described with reference to the drawings.

[0023] <<Implementation method 1>>

[0024] use Figure 1 , Figure 2 (a-1), (a-2), (b), (c) and Figure 3 The structure of the pump 1 according to the present embodiment will be described. Figure 1 is a cross-sectional view of a container 2 with a pump 1 installed, Figure 2 (a-1) and (a-2) are respectively a top view and a cross-sectional view of the pump 1. Figure 2 (b) is a cross-sectional view of the piston 20 when it is working. Figure 2 (c) is a cross-sectional view of the piston 20 when it is reset. Figure 3 It is a cross-sectional view of the cylinder 10 and the piston 20 during assembly of the pump 1 .

[0025] like Figure 1 As shown, the pump 1 is attached to an opening 2a at the top of a container 2 for storing liquid. The pump 1 draws out the liquid in the container 2 and applies pressure to eject the liquid.

[0026] like Figure 2 As shown, the pump 1 is configured to include a cylinder 10 , a piston 20 , a pressing portion 30 , a nozzle 60 , a main body 40 , and a tube 50 .

[0027] The cylinder 10 has a space inside for extracting and storing the liquid in the container 2. An opening 13 for extracting the liquid in the container 2 is provided at the lower end of the cylinder 10. A ball 11 is arranged at the opening 13, and the ball 11 functions as a valve to prevent the liquid in the cylinder 10 from flowing back into the container 2. In addition, 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.

[0028] 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 axially supports the lower piston seal 21; and an upper piston shaft 24 that is integrally formed with the upper piston seal. The lower piston seal 21 and the upper piston seal 22 are both 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.

[0029] A flange 23a is provided on the outer periphery of the lower piston shaft 23, and a lower elastic member 25 is arranged between the flange 23a and the inner wall of the cylinder body 10 near the lower end. The lower elastic member 25 applies force to the lower piston shaft 23 upward relative to the inner wall of the cylinder body 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 applies force to the lower piston seal 21 downward relative to the upper piston shaft 24. Here, springs are used for the upper elastic member 26 and the lower elastic member 25. The spring constant of the upper elastic member 26 is larger than the spring constant of the lower elastic member 25.

[0030] When the user presses the piston 20 downward, the lower piston seal 21 and the upper piston seal 22 slide down on the inner wall of the cylinder 10. At this time, the upper elastic member 26 is not compressed, and the lower elastic member 25 is compressed. As a result, the space in the cylinder 10 is compressed by the lower piston seal 21. When the pressure in the space in the cylinder 10 exceeds the specified pressure, the upper elastic member 26 is pushed up and the lower piston seal 21 moves upward. As a result, Figure 2 As shown in (b) of FIG. 2 , a flow path connecting the space below the lower piston seal 21 and the space above the lower piston seal 21 is formed.

[0031] The cylinder 10 is supported by a main body 40 and mounted on the opening of the container 2. Specifically, the main body 40 is composed of an annular mounting portion 41 mounted on the outer periphery of the opening of the container 2 and a cylindrical portion 42 mounted on the mounting portion 41. Here, the mounting portion 41 is a structure that is threadedly engaged with the outer periphery of the opening of the container 2.

[0032] The cylinder body 10 is provided with a snap-fitting portion 12 at the upper portion of the outer periphery, and the snap-fitting portion 12 snaps with the edge of the upper portion of the cylindrical portion 42 of the main body 40, and supports the cylinder body 10 in the cylindrical portion 42. In the present embodiment, the cylindrical portion 42 of the main body 40 is a double-layer structure of an inner cylinder 42a and an outer cylinder 42b. The inner cylinder 42a and a part of the outer cylinder 42b are connected. The snap-fitting portion 12 of the cylinder body 10 is hooked on the edge of the upper portion of the inner cylinder 42a and snaps with the edge of the upper portion of the inner cylinder 42a.

[0033] In addition, the inner wall of the inner tube 42a of the cylindrical portion 42 and the outer wall of the cylinder 10 are provided at corresponding locations 15 (see Figure 2 A concave portion is provided on one side of (b) and a convex portion is provided on the other side, and the concave portion and the convex portion are fitted. By this fitting, the inner wall of the cylindrical portion 42 and the outer wall of the cylinder 10 are sealed.

[0034] In this way, by adopting a structure in which the cylindrical portion 42 is provided on the mounting portion 41 and the engaging portion 12 on the upper portion of the outer periphery of the cylinder 10 is hooked and engaged with the edge of the upper portion of the cylindrical portion, the main body 40 supports the upper portion of the cylinder 10 at a position higher than the opening of the container 2. Thus, the cylinder 10 is supported by the main body so 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 main body 40.

[0035] A nozzle 60 for discharging the liquid in the cylinder 10 to the outside is attached to the outer periphery of the outer tube 42 b of the cylindrical portion 42 of the main body 40 .

[0036] The nozzle 60 is provided on the outer periphery of the outer tube 42b of the cylindrical portion 42 of the main body 40. The nozzle 60 is provided at a position corresponding to the position between the lower piston seal 21 and the upper piston seal 22. A stopper 61 is arranged in the nozzle 60 to narrow the flow path 63 in the nozzle 60. Thus, liquid can be ejected from the discharge port 62 at the front end of the nozzle 60.

[0037] The cylinder 10 is provided with a through hole 16 connected to the nozzle 60. The through hole 16 is provided in a region between positions where the lower piston seal 21 and the upper piston seal 22 are in airtight contact with the inner wall of the cylinder 10.

[0038] More specifically, the lower end portion 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 portion 21a of the lower piston seal 21 and below the upper piston seal 22. Figure 2 In the example (a-1), the through hole 16 is located above the lower end portion 21 a of the lower piston seal 21 and below the upper end portion of the lower piston seal 21 .

[0039] The upper end of the main body 40 is covered with a bushing 43. The upper piston shaft 24 penetrates the bushing 43 so as to be movable up and down.

[0040] A pressing portion 30 is attached to the upper end of the upper piston shaft 24 to receive an operation of a user to press the piston downward.

[0041] <Operation of each part of the pump 1>

[0042] use Figure 1 , Figure 2 (b) and (c) illustrate the operation of each part when the liquid in the container 2 is ejected by the pump 1.

[0043] The mounting portion 41 of the main body 40 is fixed around the opening of the container 2 by screwing.

[0044] The user presses down the upper surface of the pressing portion 30. As a result, the piston 20 equipped with the pressing portion 30 is Figure 2 (b) In this way, the spring 25 is compressed while descending in the cylinder 10.

[0045] Since the nozzle 60 is provided at the body 40 , the position of the nozzle 60 does not change even if the pressing portion 30 and the piston 20 are lowered.

[0046] As the piston 20 descends, the space 17 in the cylinder 10 is compressed, and pressure is applied to the liquid in the space 17. When the pressure in the space 17 becomes greater than the force of the spring 26 pressing the lower piston seal 21, the lower piston seal 21 compresses the spring 26 and pushes upward.

[0047] As a result, a gap is generated 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 into the space between the lower piston seal 21 and the upper piston seal 22 from the flow path 27 at once. In the cylinder 10, a through hole 16 is provided between the lower piston seal 21 and the upper piston seal 22, so the liquid that has flowed into the space between the lower piston seal 21 and the upper piston seal 22 flows into the nozzle 60 from the through hole 16 of the cylinder 10 and is discharged from the discharge port 62.

[0048] At this time, the lower piston seal 21 and the upper piston seal 22 are respectively in airtight contact with the inner wall of the cylinder 10, so the liquid flowing into the space between the lower piston seal 21 and the upper piston seal 22 is guided to the through hole 16 without leaking in the up and down direction.

[0049] The nozzle 60 has a stopper 61 inside, so the liquid flowing into the nozzle 60 advances in a narrow flow path 63 between the inner wall of the nozzle 60 and the stopper 61, and is ejected to the outside space from the discharge port 62. Thus, the liquid can be ejected from the discharge port 62 in a mist form.

[0050] Since the position of the nozzle 60 does not change during spraying, the user can spray the mist-like liquid toward the intended position.

[0051] When the user releases the pressing portion 30, Figure 2 (c) In this way, the spring 26 presses the lower piston seal 21 to close the flow path 27, and the spring 25 pushes up the piston 20, and the piston 20 returns to its original position.

[0052] As a result, the space 17 in the cylinder is expanded, the space 17 becomes negative pressure, and the ball 11 is pushed up to open the opening 13 at the lower end of the cylinder 10. Figure 2 As shown by the solid arrow in (c), the liquid in the container 2 is drawn out by the tube 50, passes through the opening 13 at the lower end of the cylinder 10, and fills the space 17 in the cylinder 10. Thus, when the user presses the pressing portion 30 next time, the liquid in the cylinder 10 is ejected.

[0053] At this time, if Figure 2 As shown by the dotted arrow in (c), the main body 40 is provided with an air supply path 44 capable of introducing external air into the container 2 from between the edge of the opening of the container 2 and the outer wall of the cylinder 10. Thus, as the liquid is drawn into the cylinder 10, external air is introduced into the container 2, thereby maintaining the pressure in the container 2 at atmospheric pressure.

[0054] Furthermore, the position of the nozzle 60 does not change when the piston 20 is reset.

[0055] As described above, when the pump 1 of this embodiment presses the piston 20 to eject the liquid from the nozzle 60, the position of the nozzle 60 does not change. Therefore, when the user wants to spray the medicine deep into the throat or spray the medicine onto the scalp, the user can easily spray the mist liquid to the intended position.

[0056] Moreover, by configuring the upper portion of the cylinder body 10 at a position above the opening of the container 2 and providing a nozzle 60 on the main body 40 at a position corresponding to between the lower piston seal 21 and the upper piston seal 22, the liquid flowing into the space between the lower piston seal 21 and the upper piston seal 22 can be guided to the through hole 16 without leaking in the up and down directions.

[0057] This eliminates the need to provide a sealing member separately, and the number of components can be reduced. At the same time, the nozzle 60 can be arranged near the opening of the container 2, so that a pump 1 that is compact in height can be provided.

[0058] Furthermore, since the pump 1 has a small number of parts and a compact structure, it is possible to provide customers with a product that requires a small amount of resin for manufacturing and is environmentally friendly.

[0059] In addition, the lower end of the cylinder 10 is located near the opening of the container 2 and is not deeply inserted into the container 2. Therefore, the pump 1 can be installed in a small container 2 with a shallow depth to discharge the solution in the container 2. Therefore, the pump 1 is also suitable for a small container 2 containing a small amount of liquid. In addition, the amount of resin required for manufacturing a small container 2 is small, so by using the pump 1 of this embodiment, it is possible to take the environment into consideration.

[0060] Furthermore, the liquid flowing into the space between the lower piston seal 21 and the upper piston seal 22 can be moved laterally through the through hole 16 of the cylinder 10 and guided to the nozzle 60 over the shortest distance. Therefore, the amount of liquid remaining in the nozzle 60 before the next injection can be minimized.

[0061] In addition, the cylinder 10 and the piston 20 of this embodiment are assembled to Figure 3 After the pump is in the state (pump core state), it can be easily assembled by simply hooking the engaging portion 12 on the edge of the cylindrical portion 42 of the main body 40. Therefore, by assembling the pump core part in advance and engaging and installing it to the pressing portion 30 and the main body 40 of the color and shape that meet the customer's requirements, the time required for assembly completion can be shortened, and timely delivery can be achieved within a short delivery period.

[0062] <<Implementation method 2>>

[0063] use Figure 4 (a) will now be described a container 2 to which the pump 200 according to the second embodiment is mounted.

[0064] The pump 200 of the second embodiment has the same structure as the pump 1 of the first embodiment, but the pump 200 of the second embodiment is a droplet-type pump that discharges liquid as droplets instead of mist. Therefore, the spring constant of the upper elastic member 26 and the structure of the nozzle 60 are different from those of the first embodiment.

[0065] The upper elastic member 26 of the pump 200 of the second embodiment uses a member having a smaller spring constant than the spring constant of the upper elastic member 26 of the first embodiment. The second embodiment is the same as the first embodiment in that the spring constant of the upper elastic member 26 is larger than the spring constant of the lower elastic member 25. Thus, since the spring constant of the upper elastic member 26 is smaller than that of the first embodiment, the threshold value of the pressure in the cylinder 10 at which the lower piston seal 21 is pushed up and the flow path 27 is opened in the pump 200 of the second embodiment is smaller than that of the pump 1 of the first embodiment.

[0066] In the pump of the second embodiment, the nozzle 60 is designed so that the space of the flow path 63 inside is larger than that of the first embodiment, and the size of the discharge port 62 is also larger than that of the first embodiment.

[0067] Therefore, in the pump of embodiment 2, when the pressure in the cylinder body 10 is lower than that in embodiment 1, the lower piston seal 21 is pushed up to open the flow path 27, and the liquid flows into the space between the lower piston seal 21 and the upper piston seal 22, passes through the through hole 16, and passes through the flow path 63 in the nozzle 60 which is larger than that in embodiment 1, and is discharged from the discharge port 62 as droplets.

[0068] In this way, since the present embodiment is a pump having a lower elastic member 25 and an upper elastic member 26, it is possible to realize a mist-type pump 1 that sprays mist-like liquid as in embodiment 1 and a drop-type pump 200 that discharges droplets as in embodiment 2 by using the same pump structure and only changing the spring constant of the upper elastic member 26.

[0069] The other structures, operations, and effects of the pump 200 of the second embodiment are the same as those of the first embodiment. Since the nozzle 60 does not move up and down, the user can discharge liquid droplets toward a desired position.

[0070] The other structures of the pump 200 according to the second embodiment are the same as those of the first embodiment, and thus the description thereof will be omitted.

[0071] <<Implementation method 3>>

[0072] use Figure 4 (b) and (c) illustrate the container 2 to which the pump 300 of the third embodiment is mounted.

[0073] The pump 300 of the third embodiment is a drop-shaped pump like the pump 200 of the second embodiment, but the nozzle 60 is curved longer than the pump 200 of the second embodiment and is rotatable relative to the body 40. The pump 300 of the third embodiment can make the central axis of the long nozzle 60 face the horizontal direction or face the central axis of the long nozzle 60 face upward by rotating the nozzle 60.

[0074] In the pump 300 of the third embodiment, the nozzle 60 does not move up and down and the nozzle 60 is long, so the user can move the discharge port 62 close to the desired position to discharge the droplets, so the user can easily spray the droplets to the desired position. For example, it is preferable when the user wants to spray the droplets of the liquid medicine at a specific part deep in the throat.

[0075] The other structures of the pump 300 according to the third embodiment are the same as those of the first embodiment, and thus the description thereof will be omitted.

[0076] <<Implementation method 4>>

[0077] use Figure 5 The container 2 to which the pump 400 according to the fourth embodiment is attached will be described.

[0078] The pump 400 of the fourth embodiment is a drop-type pump similar to 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.

[0079] Therefore, the diameter and length of the cylinder 10 are larger than those of the pump 200 of the second embodiment. The other structures are the same as those of the pump 200 of the second embodiment.

[0080] The other structures, operations, and effects of the pump 400 according to the fourth embodiment are the same as those of the pump 200 according to the second embodiment, and thus the description thereof will be omitted.

[0081] Description of Reference Numerals

[0082] 1 Pump

[0083] 2 Container

[0084] 2a Opening

[0085] 10 Cylinder

[0086] 11 balls

[0087] 12. Snap-fit ​​section

[0088] 13 Opening

[0089] 15 parts

[0090] 16 Through holes

[0091] 17 Space

[0092] 20 Piston

[0093] 21 Lower piston seal

[0094] 21a Lower end

[0095] 22 Upper piston seal

[0096] 23 Lower piston shaft

[0097] 23a Flange

[0098] 24 Upper piston shaft

[0099] 25 Lower elastic member

[0100] 26 Upper elastic member

[0101] 27 flow path

[0102] 30 Pressing part

[0103] 40 Main Body

[0104] 41 Installation

[0105] 42 cylindrical part

[0106] 42a Inner tube

[0107] 42b outer cylinder

[0108] 43 Bushing

[0109] 44 Air supply line

[0110] 50 tubes

[0111] 60 Nozzle

[0112] 61 Block

[0113] 62 Exhaust

[0114] 63 flow path

[0115] 200 Pumps

[0116] 300 Pumps

[0117] 400 pumps.

Claims

1. A pump for discharging liquid from a container. It is characterized in that The pump has: A cylinder having a space inside for storing the liquid in the container; A piston, the lower end of which is inserted into the cylinder; a main body that supports the cylinder and is mounted on the opening of the container; and a nozzle that discharges the liquid in the cylinder to the outside, The piston comprises: an annular lower piston seal and an upper piston seal, which are in airtight and slidable contact with the inner wall of the cylinder; and a flow path, which guides the liquid in the cylinder to the space between the lower piston seal and the upper piston seal when the pressure in the cylinder exceeds a predetermined pressure. The main body supports the upper portion of the cylinder at a position higher than the opening of the container so that the lower piston seal and the upper piston seal are located above the opening of the container. At least a portion of the nozzle is located in a range of the outer circumference of the body corresponding to between the lower piston seal and the upper piston seal, The cylinder body is provided with a through hole connecting the cylinder body and 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 body.

2. The pump according to claim 1, It is characterized in that The piston includes: a piston shaft supporting the lower piston seal and the upper piston seal; a lower elastic member for applying force to the piston shaft upward relative to the inner wall of the cylinder; and an upper elastic member for applying force to the lower piston seal downward relative to the piston shaft. When the pressure in 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 the lower piston seal with the space above the lower piston seal to form the flow path.

3. The pump according to claim 1, It is characterized in that A pressing portion is attached to the upper end of the piston to receive an operation of a user pressing the piston downward.

4. The pump according to claim 1, It is characterized in that The annular lower piston seal is located at a position where the lower end portion contacts the inner wall of the cylinder body in an airtight manner. The through hole of the cylinder is located above the lower end portion of the lower piston seal and below the upper end portion of the lower piston seal.

5. The pump according to claim 1, It is characterized in that The main body includes an annular mounting portion mounted on the outer periphery of the opening of the container and a cylindrical portion mounted on the mounting portion. The cylinder body includes an engaging portion on an outer periphery thereof, and the engaging portion engages with an edge of an upper portion of the cylindrical portion to support the cylinder body in the cylindrical portion.

6. The pump according to claim 5, It is characterized in that A concave portion is provided on one of corresponding locations on the inner wall of the cylindrical portion and an outer wall of the cylinder, and a convex portion is provided on the other of corresponding locations. The concave portion and the convex portion fit together to seal the inner wall of the cylindrical portion and the outer wall of the cylinder.

7. The pump according to claim 1, It is characterized in that The main body is provided with an air supply path capable of introducing external air into the container from between an edge of the opening of the container and an outer wall of the cylinder.

8. The pump according to claim 1, It is characterized in that A valve is disposed at the lower end of the cylinder to prevent the backflow of liquid from the inside of the cylinder into the container.

9. A spray container comprising a container and a pump mounted on an opening of the container, It is characterized in that The pump is the pump according to any one of claims 1 to 8.

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