Pump and ejection container

Abstract

To provide a pump which enables a liquid to be discharged by pushing down a diaphragm of an elastic member with a small force and has a simple component structure.SOLUTION: A pump has a structure in which a diaphragm is attached to a cylindrical body having rigidity. The diaphragm includes a cylindrical film at its periphery and is attached so as to overlap with one area of an inner peripheral surface of a cylindrical part of the body. The body is provided with an inflow port and an outflow port. The inflow port is provided at an area, where the cylindrical film of the diaphragm is overlapped, of the cylindrical part. On the other hand, the outflow port is provided in an area, where the cylindrical film of the diaphragm does not overlap, of the body.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art A widely used pump for discharging liquid from a container is one that has a structure in which a piston moves up and down to suck up the liquid into a cylinder and discharge it from a nozzle.

[0003] On the other hand, diaphragm pumps are known as pumps that do not use pistons and cylinders. Diaphragm pumps use a diaphragm and two check valves, and the volume of the body is changed by displacing the diaphragm, causing liquid to flow into the body and then out.

[0004] Patent Document 1 discloses a pump in which legs (bellows walls) are provided on a dome-shaped bellows, and the bellows walls are in intimate contact with the inlet and outlet passages of a pump chamber. This pump applies force to the dome-shaped bellows to displace it, changing the volume of the internal space of the pump chamber, and by putting the internal space in a low-pressure state, it pulls the bellows walls together, opening the inlet passage and allowing fluid to flow into the pump chamber. It also applies force to the dome-shaped bellows to apply pressure to the fluid in the internal space, and the pressurized fluid lifts the upper rim of the bellows wall, allowing the liquid to reach the outlet passage and flow out.

[0005] Patent Document 2 discloses a pump having a structure in which a dome-shaped bellows is mounted on a plate-shaped member with an inlet hole and an outlet hole. A sealing web (flange) is provided on the outer periphery of the dome-shaped bellows. When the dome-shaped bellows is pressed, the sealing web is pressed against the inlet hole, blocking the inlet hole and forcing the liquid in the dome-shaped bellows out of the outlet hole. When the dome-shaped bellows is lifted upward, the sealing web (flange) opens the inlet, allowing the liquid to flow into the dome-shaped bellows. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2010 / 117754 [Patent Document 2] JP 2007-146834 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the pump of Patent Document 1, both the inflow passage and the discharge passage are covered by the legs of the bellows (bellows wall), and the inflow passage and the discharge passage are both opened and closed by deformation of the bellows. Therefore, it is necessary to carry out a complex design of the shape and displacement of the bellows and the legs of the bellows. In addition, it is necessary to provide multiple grooves on the inner wall of the pump chamber, which makes the structure complicated.

[0008] In the pump of Patent Document 2, the force pressing the bellows presses the sealing web against the inlet hole to close it, so the user needs to press the bellows strongly.

[0009] An object of the present invention is to provide a pump that can discharge liquid by pressing a diaphragm made of an elastic material with a small force and that has a simple component configuration. [Means for solving the problem]

[0010] In order to achieve the above object, the pump of the present invention is a pump that takes in and discharges liquid from a container, and has a main body and a diaphragm. The main body includes a rigid cylindrical portion and a bottom surface portion that covers an opening at one end of the cylindrical portion. The diaphragm includes an elastic cylindrical membrane and a pressure membrane that covers the opening at one end of the cylindrical membrane and has elasticity that can be deformed by being pressed by a user. The diaphragm is attached to the main body so that the cylindrical membrane overlaps at least a partial area of ​​the inner circumferential surface of the cylindrical portion of the main body. The pressure membrane covers the opening at the other end of the cylindrical portion of the main body. The main body is provided with an inlet that takes in liquid from the container into the internal space of the main body, and an outlet that lets out the liquid taken into the internal space of the main body. The inlet is provided in an area where the cylindrical membrane of the diaphragm overlaps with the inner circumferential surface of the cylindrical portion. At least a portion of the cylindrical membrane that overlaps with the inlet is a valve that opens and closes the inlet. The outlet is provided in an area of ​​the main body where the cylindrical membrane of the diaphragm does not overlap. Effect of the Invention

[0011] According to the present invention, it is possible to provide a pump that can discharge liquid by pressing a diaphragm made of an elastic member with a small force and that has a simple component configuration. [Brief description of the drawings]

[0012] [Figure 1] 1A is a cross-sectional view of the pump 1 of the first embodiment taken along the line A-A', FIG. 1B is a cross-sectional view of the pump 1 when it is at rest, and FIG. [Diagram 2] (a) front view, (b) right side view, (c) bottom view, (d) rear view, (e) oblique view, (f) B-B' cross-sectional view, and (g) CC' cross-sectional view of the diaphragm 20 of the pump 1 of embodiment 1. [Diagram 3] (a) front view, (b) right side view, (c) bottom view, (d) plan view, (e) rear view, and (f) oblique view of the main body 10 of the pump 1 of embodiment 1. [Figure 4] 3A is a DD' cross-sectional view, (b) an EE' cross-sectional view, and (c) an FF' cross-sectional view of the main body 10 of the pump 1 of embodiment 1. FIG. [Diagram 5]1A is a cross-sectional view of a pump 2 according to a second embodiment taken along the line G-G'; FIG. 1B is a cross-sectional view of the pump 2 when stationary; and FIG. [Figure 6] 13A is a cross-sectional view of a pump 3 according to a third embodiment taken along line HH', FIG. 13B is a cross-sectional view of the pump 3 when stationary, and FIG. [Figure 7] (a) front view, (b) right side view, (c) bottom view, (d) rear view, (e) oblique view, (f) I-I' cross-sectional view, and (g) J-J' cross-sectional view of the diaphragm 20 of the pump 3 of embodiment 3. [Figure 8] 13A is a front view, (b) a right side view, (c) a bottom view, (d) a plan view, (e) a rear view, and (f) a perspective view of a main body 10 of a pump 3 of embodiment 3. [Figure 9] 13A is a K-K' cross-sectional view, (b) is an L-L' cross-sectional view, and (c) is an M-M' cross-sectional view of the main body 10 of the pump 3 of embodiment 3. FIG. [Figure 10] 13A is a cross-sectional view of a pump 4 according to a fourth embodiment taken along the line N-N', FIG. 13B is a cross-sectional view of the pump 4 when stationary, and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a pump according to an embodiment of the present invention will be described with reference to the drawings.

[0014] <<Embodiment 1>> The configuration of a pump 1 of this embodiment will be described with reference to FIGS. 1 to 3. FIG.

[0015] Figures 1(a) to (c) are cross-sectional views of pump 1. Figures 2(a) to (g) are diagrams showing the appearance and cross-sectional shape of diaphragm 20 of pump 1. Figures 3(a) to (e) are diagrams showing the appearance of the main body of pump 1, and Figures 4(a) to (c) are cross-sectional views of pump 1.

[0016] As shown in Figs. 1(b) and (c), the pump 1 is attached to the spout 100a of a container 100 that contains liquid, forming a spray container. The pump 1 takes in the liquid in the container 100 and applies pressure to discharge it. In the first embodiment, the container 100 is disposed with the spout 100a facing downward, and the pump 1 is attached to the lower part of the container 100 and discharges the liquid downward. The container 100 may be a bottle or a pouch.

[0017] The configuration of a pump 1 will be described with reference to FIGS.

[0018] The pump 1 includes a main body 10 and a diaphragm 20 .

[0019] The main body 10 comprises a rigid cylindrical portion 15 and a bottom portion 12, and the bottom portion 12 covers an opening at one end of the cylindrical portion 15. A diaphragm 20 is attached to the opening at the other end of the cylindrical portion 15. The main body 10 is made of a rigid material, such as a resin or metal. For example, the main body 10 can be made of polypropylene or polyethylene.

[0020] The diaphragm 20 comprises an elastic cylindrical membrane 21 and an elastic pressure membrane 22. The pressure membrane 22 covers an opening at one end of the cylindrical membrane 21. The opening of the cylindrical membrane 21 on the opposite side to the pressure membrane 22 is inserted into the opening of the cylindrical portion 15 of the main body 10, and the pressure membrane 22 covers and closes the opening of the cylindrical portion 15 of the main body 10. The cylindrical membrane 21 is inserted into the main body 10 so that the central axis of the cylindrical membrane 21 coincides with the central axis 10a of the main body 10.

[0021] 2(b), (c), (f), and (g), the cylindrical membrane 21 is designed so that the diameter of the peripheral portion 21a of the opening is slightly larger than the other portions. As a result, when the pressing membrane 22 is not deformed, the peripheral portion 21a of the opening of the cylindrical membrane 21 is in close contact with the inner peripheral surface of the cylindrical portion 15 along the circumferential direction, and acts as a valve.

[0022] The diaphragm 20 is made of a deformable elastic material. For example, the diaphragm 20 can be made of an elastomer such as rubber, polyethylene, or a mixed material of an elastomer and a resin. The thickness of the cylindrical membrane 21 and the pressing membrane 22 is, for example, about 0.3 to 2.0 mm.

[0023] A step is provided along the circumferential direction on the inner circumferential surface of the cylindrical portion 15 of the main body 10 near the opening on the opposite side to the bottom portion 12, and a recess 15c is formed in the step portion.

[0024] On the other hand, the diaphragm 20 has a protrusion 24 formed along the circumferential direction on the outer periphery of the cylindrical membrane 21 near the boundary between the pressing membrane 22 and the cylindrical membrane 21 .

[0025] The cylindrical membrane 21 of the diaphragm 20 inserted into the cylindrical portion 15 of the main body 10 has a projection 24 on its outer periphery that engages with a recess 15c of the main body 10. A fixing ring 50 is attached to the diaphragm 20 on the pressing membrane 22 side of the projection 24. The inner periphery of the fixing ring 50 contacts the diaphragm 20, and the outer periphery of the fixing ring 50 contacts the inner periphery of the cylindrical portion 15, so that the fixing ring 50 is sandwiched and fitted between the diaphragm 20 and the main body 10. In this way, the fixing ring 50 fixes the diaphragm 20 to the main body 10.

[0026] When at rest, the pressure membrane 22 of the diaphragm 20 is convex with a protruding center, as shown in Figure 1 (b) and Figures 2 (a) to (g), and has a shape in which the center is farther from the bottom portion 12 of the main body 10 than the peripheral portion.

[0027] When the pressable membrane 22 is pressed by a user, it deforms into a concave shape with the center portion closer to the bottom portion 12 than the peripheral portion, as shown in FIG. 1(c).

[0028] The cylindrical membrane 21 of the diaphragm 20 overlaps at least a partial area of ​​the inner circumferential surface of the cylindrical portion 15 of the main body 10 when attached to the main body 10 as shown in FIGS. 1(b) and (c).

[0029] The main body 10 is provided with an inlet 15a for taking in the liquid from the container 100 into the internal space of the main body 10, and an outlet 15b for letting the liquid taken into the internal space of the main body 10 flow out.

[0030] The inlet 15a is provided in the region of the cylindrical portion 15 where the cylindrical membrane 21 of the diaphragm 20 overlaps.

[0031] On the other hand, the outlet 15b is provided in a region of the main body 10 that is not overlapped by the cylindrical membrane 21 of the diaphragm 20. In the first embodiment, the outlet 15b is provided in a region of the cylindrical portion 15 that is not overlapped by the cylindrical membrane 21 of the diaphragm 20.

[0032] Specifically, the length of the cylindrical portion 15 of the main body 10 in the direction of the central axis 10a is designed to be greater than the length of the cylindrical membrane 21 of the diaphragm 20 in the direction of the central axis 10a. For this reason, an area of ​​the cylindrical portion 15 where the cylindrical membrane 21 does not overlap is formed in a portion close to the bottom surface portion 12. The outlet 15b is provided at a position closer to the bottom surface portion 12 than the central axis 30a of the inlet 15a, that is, in the area where the cylindrical membrane 21 does not overlap, closer to the bottom surface portion 12 in the direction of the central axis 10a of the cylindrical portion 15, as shown in Figs. 1(b) and (c).

[0033] In this embodiment, the outlet 15b is provided in the cylindrical portion 15, but it may be provided in the bottom portion 12.

[0034] An inflow pipe 30 is connected to the inlet 15a. A mounting ring 80 is connected to the inflow pipe 30 for mounting the pump 1 to the spout 100a of the container 100. A female thread is formed on the inner wall of the mounting ring 80, which screws into a male thread on the outer periphery of the spout 100a. A packing 81 is disposed on the mounting ring 80 at the portion where the tip of the spout 100a comes into contact.

[0035] A plate-shaped check valve 70 is attached to the outlet 15b.

[0036] Further, the outlet 15b is connected to an outflow pipe 90. The outflow pipe 90 has a discharge nozzle 40 attached thereto.

[0037] Further, a spring 60 is arranged in the space within the main body 10, which biases the pressing membrane 22 of the diaphragm 20 in a direction away from the bottom surface portion 12 along the central axis 10a. The spring 60 is supported by a plurality of support members 11 arranged radially on the bottom surface portion 12. Note that if the pressing membrane 22 itself has sufficient restoring force, the spring 60 is not necessary.

[0038] <Operation of each part during operation> Next, the operation of each part during operation will be described.

[0039] At the start of use, the spout 100a of the container 100 is screwed onto the mounting ring 80, and the container 100 is supported by hanging it so that the spout 100a of the container 100 faces downward. As a result, the liquid in the container 100 moves from the spout 100a of the container 100 into the inlet pipe 30 by gravity and reaches the inlet 15a. The liquid flows from the inlet 15a into the gap between the cylindrical membrane 21 and the inner circumferential surface of the cylindrical portion 15, spreads in the circumferential direction, and fills the gap between the cylindrical membrane 21 and the inner circumferential surface of the cylindrical portion 15 along the circumferential direction. At this time, the peripheral portion 21a of the cylindrical membrane 21 has a larger diameter than the other portions, so it is pressed against the inner wall of the cylindrical portion 15 and acts as a valve, isolating the gap between the cylindrical membrane 21 and the cylindrical portion 15 from the space 10b in the main body 10. As a result, the peripheral portion 21a prevents the liquid filling the gap between the cylindrical membrane 21 and the cylindrical portion 15 from flowing into the space 10b within the main body 10.

[0040] In this state, air is present inside the main body 10, and the pressing membrane 22 has a convex shape as shown in Fig. 1(b). When the user presses the pressing membrane 22 with a finger or the like in a direction approaching the bottom surface portion 12 of the main body 10, the pressing membrane 22 deforms into a concave shape as shown in Fig. 1(c), compressing the space 10b inside the main body 10. As a result, the air in the space 10b inside the main body 10 passes through the check valve 70 from the outlet 15b and is released to the outside.

[0041] When the user stops pressing the pressure membrane 22, the pressure membrane 22 returns to its original convex shape due to the bias of the spring 60. As a result, the space 10b in the main body 10 is expanded, so that the space 10b becomes negative pressure, and the cylindrical membrane 21 of the diaphragm 20 is drawn toward the space 10b. When at least a part of the peripheral portion 21a of the cylindrical membrane 21 acting as a valve is displaced from the inner circumferential surface of the cylindrical portion 15 toward the central axis 10a of the cylindrical membrane 21, the valve opens, and the liquid filling the gap between the cylindrical membrane 21 and the inner wall of the cylindrical portion 15 flows into the space 10b from the displaced peripheral portion 21a, and then the liquid in the container 100 flows into the space 10b from the displaced peripheral portion 21a through the inlet pipe 30 and the inlet 15a, filling the space 10b.

[0042] 1(c), when the user presses the pressing membrane 22 into the main body 10, the pressing membrane 22 deforms into a concave shape, the internal space 10b of the main body 10 is compressed, and pressure is applied to the liquid in the space. The pressure of the liquid opens the check valve 70, and the liquid passes through the check valve 70 and is discharged from the opening 41 at the tip of the discharge nozzle 40.

[0043] When the user releases the pressure membrane 22 after the liquid has been discharged, the spring 60 pushes up the pressure membrane 22, and the pressure membrane 22 returns to a convex shape (FIG. 1(b)). At that time, the internal space of the main body 10 is expanded again, the space becomes negative pressure, and at least a part of the periphery 21a acting as a valve is displaced toward the central axis 10a of the cylindrical membrane 21. This causes the valve to open again, and the liquid in the container 100 flows into the space 10b from the displaced part of the periphery 21a, filling the space 10b.

[0044] As a result, the next time the user presses down on the pressing film 22 , the liquid in the main body 10 is discharged from the discharge nozzle 40 .

[0045] As described above, the pump 1 of the first embodiment can discharge liquid from the container 100 by the user pressing the elastic diaphragm 20 to deform the pressing film 22 of the diaphragm 20. Therefore, a user can press the soft diaphragm 20 with a finger, which is a small stroke movement, to discharge liquid, providing a user-friendly pump.

[0046] In addition, since the entire peripheral portion 21a of the cylindrical membrane 21 of the diaphragm 20 acts as a valve, the flow of liquid into the space 10b is unlikely to become unstable even if manufacturing errors occur in the diaphragm 20 or the cylindrical portion 15. Furthermore, since the entire peripheral portion 21a of the cylindrical membrane 21 acts as a valve, if even a part of the peripheral portion 21a can be displaced, liquid can be drawn into the space 10b, so that liquid can be drawn into the space 10b relatively easily, improving the usability when the pump 1 is operated continuously.

[0047] In the pump 1 of the first embodiment, the position of the outlet 15b of the main body 10 is shifted in the direction of the central axis 10a with respect to the inlet 15a so that the cylindrical membrane 21 of the diaphragm 20 does not cover the outlet 15b.

[0048] If the outlet 15b is arranged to be covered by the cylindrical membrane 21 in the same manner as the inlet 15a, when liquid flows into the space 10b from the inlet 15a, only the part of the cylindrical membrane 21 that covers the inlet 15a must be displaced to open, and the part that covers the outlet 15b must be left closed without being displaced. When liquid flows out of the space 10b, only the membrane surface of the part of the cylindrical membrane 21 that covers the outlet 15b must be displaced to open, and the part that covers the inlet 15a must be left closed without being displaced. For this reason, some kind of ingenuity is required in the structure of the cylindrical membrane 21 or the structure of the inner wall surface of the cylindrical portion 15, making the structure complicated.

[0049] In contrast, the pump of this embodiment 1 can open space 10b from the inlet 15a by designing the peripheral portion 21a of the cylindrical membrane 21 to move away from the inner wall of the cylindrical portion 15 at least at one point in the circumferential direction due to the negative pressure when the pressure membrane 22 is restored.

[0050] Therefore, it is possible to simplify the structure of both the cylindrical membrane 21 and the cylindrical portion 15. Therefore, it is possible to provide an easy-to-use pump 1 that can reliably introduce liquid and can push the diaphragm 20 to discharge liquid, using components with a simple structure.

[0051] In the pump 1 of the first embodiment, the attachment ring 80 is screwed onto the spout 100a of the container 100, but the attachment method is not limited to screwing. The attachment ring 80 may be structured to fit onto the spout 100a by a method other than screwing. In addition, when the container 100 is a pouch, it is also possible to use an attachment ring 80 structured to be attached to a spout provided by cutting out a part of the pouch, for example, by sandwiching a sheet of the pouch around the edge of the spout.

[0052] <<Embodiment 2>> The configuration of the pump 2 of the second embodiment will be described with reference to Fig. 5. Figs. 5(a) to (c) are cross-sectional views of the pump 2. In Figs. 5(a) to (c), the same components as those in Fig. 1 of the first embodiment are denoted by the same reference numerals.

[0053] The pump 1 in embodiment 1 is configured to be connected to the spout 100a of a container 100 with the spout 100a facing downward, whereas the pump 2 in embodiment 2 is configured to be attached to a container 100 with the spout 100a facing upward.

[0054] The pump 2 of embodiment 2 has a similar configuration to the pump of embodiment 1, but as shown in Figures 5(a) to (c), a connecting ring 83 is provided inside the mounting ring 80, and a suction tube 84 is connected to the connecting ring 83 for sucking up the liquid in the container 100.

[0055] The lower end of the suction tube 84 is inserted into the container 100 and the mounting collar 80 threads onto a spout 100 a at the top of the container 100 .

[0056] In the pump 2 of the second embodiment, the outlet 15b of the cylindrical portion 15 of the main body 10 is provided in the cylindrical portion 15 at a position shifted from the inlet 15a by a predetermined angle (here, 90 degrees) in the circumferential direction about the central axis 10a. Note that the position at which the outlet 15b is provided in the cylindrical portion 15 is a position that does not overlap with the cylindrical membrane 21, similar to the first embodiment.

[0057] Other configurations of the pump 2 are similar to those of the pump 1 of the first embodiment, and therefore description thereof will be omitted.

[0058] In the pump 2 of the second embodiment, when the user presses the pressure membrane 22 of the diaphragm 20 in the initial state, the pressure membrane 22 deforms from the state shown in Fig. 5(b) to the state shown in Fig. 5(c), compressing the internal space 10b and discharging air from the outlet 15b. When the user stops pressing, the pressure membrane 22 is biased by the spring 60 to return to the state shown in Fig. 5(b), creating a negative pressure in the internal space 10b. This causes the cylindrical membrane 21 to be drawn into the internal space 10b, and the liquid in the container 100 is sucked up through the suction tube 84 and filled into the internal space 10b.

[0059] Next, when the user presses the pressing membrane 22, the state of FIG. 5(c) is restored, and the liquid in the internal space 10b flows out from the outlet 15b and is discharged from the discharge nozzle .

[0060] The pump 2 of the second embodiment can suck up the liquid in the container 100 located below the pump 2 and discharge it from a discharge port oriented at a predetermined angle. Other effects are similar to those of the pump 1 of the first embodiment, and therefore description thereof will be omitted.

[0061] <<Embodiment 3>> The pump 3 of the third embodiment will be described with reference to FIGS.

[0062] In the pump of embodiment 3, similarly to pump 1 of embodiment 1, container 100 is placed with spout 100a facing downward, and pump 1 is attached to the lower part of container 100 to eject liquid downward.

[0063] Figures 6(a) to (c) are cross-sectional views of the pump 3. Figures 7(a) to (g) are diagrams showing the appearance and cross-sectional shape of the diaphragm 20 of the pump 3. Figures 8(a) to (e) are diagrams showing the appearance of the main body of the pump 3, and Figures 9(a) to (c) are cross-sectional views of the pump 3. In Figures 6 to 9, configurations similar to those in Figure 1 of embodiment 1 are denoted by the same reference numerals.

[0064] The basic structure of the pump 3 is similar to that of the pump 1 of the first embodiment, but the differences will be described below.

[0065] As shown in Figures 6(a) to (c) and Figures 8(a) and (f), in the pump 3, one end of a second cylindrical portion 114 having a smaller diameter than the cylindrical portion 15 is fixed to the center of the bottom portion 12 within the main body 10 along the direction of the central axis 10a.

[0066] An opening 114a is provided on the side surface of the second cylindrical portion 114, and a communication pipe 140 that communicates between the two is disposed between the opening 114a and the outlet 15b. Here, the communication pipe 140 penetrates the outlet 15b and protrudes to the outside of the cylindrical portion 15, and also serves as a discharge nozzle (FIGS. 6(a)-(c), FIG. 8(a)-(c), (e), (f)).

[0067] Meanwhile, the diaphragm 20 has a second cylindrical membrane 125, which has an inner diameter smaller than that of the cylindrical membrane 21, arranged inside the cylindrical membrane 21 along the central axis 10a (Figures 6(a)-(c), Figures 7(d), (f), (g)). One end of the second cylindrical membrane 125 is fixed to the center of the pressure membrane 22 of the diaphragm 20, and a tip 125a is inserted inside the opening of the second cylindrical portion 114. The peripheral edge of the tip 125a of the second cylindrical membrane 125 contacts the inner wall of the second cylindrical portion 114 and functions as a valve.

[0068] The second cylindrical membrane 125 is made of the same material as the cylindrical membrane 21 .

[0069] Other configurations of the pump 3 are similar to those of the pump 1 of the first embodiment, and therefore description thereof will be omitted.

[0070] In the pump 3 of the third embodiment, when a user presses the pressing film 22 of the diaphragm 20 in the initial state, the pressing film 22 is deformed from the state shown in Fig. 5(b) to the state shown in Fig. 5(c). At this time, the second cylindrical film 125 is displaced along the central axis 10a with the tip 125a sliding against the inner wall of the second cylindrical portion 114 in accordance with the displacement of the pressing film 22. The compressed air pushes open the gap between the tip 125a of the second cylindrical film 125 and the second cylindrical portion 114, passes through the second cylindrical portion 114 and the communicating tube 140, and is discharged from the tip of the communicating tube 140. When the user stops pressing, the pressing membrane 22 is biased by the spring 60 and returns to the state shown in FIG. 6(b). At this time, the second cylindrical membrane 125 is displaced along the central axis 10a with the tip 125a sliding against the inner wall of the second cylindrical portion 114 as the pressing membrane 22 is displaced. As the pressing membrane 22 returns to its original state, the internal space 10b expands and becomes negative pressure. As a result, the cylindrical membrane 21 is drawn into the internal space 10b, and the liquid in the container 100 flows in from the inlet 15a and fills the internal space 10b.

[0071] Next, when the user presses the pressing membrane 22 in FIG. 6(c), the pressing membrane 22 is deformed into a concave shape, and the second cylindrical membrane 125 is displaced while sliding inside the second cylindrical portion 114. The internal space 10b of the main body 10 is compressed, and pressure is applied to the liquid in the space. The pressure of the liquid deforms the second cylindrical membrane so as to expand the gap between the tip 125a of the second cylindrical membrane 125 and the second cylindrical portion 114. As a result, the liquid passes through the second cylindrical portion 114 and the communicating tube 140 and is discharged from the tip of the communicating tube 140.

[0072] Next, when the user stops pressing the pressing membrane 22 in FIG. 6(c), the pressing membrane 22 is urged by the spring 60 to return to the state in FIG. 6(b). At this time, the second cylindrical membrane 125 is displaced in a direction away from the second cylindrical portion 114 along the central axis 10a while sliding the tip 125a against the inner wall of the second cylindrical portion 114 in accordance with the displacement of the pressing membrane 22, but the tip 125a of the second cylindrical membrane 125 does not fall off from the second cylindrical portion 114. Therefore, the space inside the second cylindrical portion 114 and the second cylindrical membrane 125 expands, and the inside of the space becomes negative pressure. As a result, if there is liquid remaining inside the communicating tube 140, it is sucked up and pulled back into the second cylindrical portion 114 (back suction function). Therefore, it is possible to prevent liquid from dripping from the outlet 15b when the pressing membrane 22 is not pressed.

[0073] The pump 2 of the third embodiment can achieve the same effects as the pump 1 of the first embodiment. In addition, the pump 2 of the third embodiment does not require the check valve 70 of the pump 1 of the first embodiment, and therefore has the effect of reducing the number of parts compared to the first embodiment.

[0074] In this embodiment, as shown in FIG. 6(b), it is preferable that the end 114b of the communicating tube 140 on the opening 114a side is arranged to slightly protrude into the second cylindrical portion 114, and a step is formed between the end 114b and the second cylindrical portion 114. If liquid has accumulated in the communicating tube 140, when the deformation of the diaphragm 20 returns from the state shown in FIG. 6(c) to the state shown in FIG. 6(b), the liquid in the communicating tube 140 is pulled back to the second cylindrical portion 114 from the opening 114a of the communicating tube 140 by back suction. At this time, the end 114b, which is the connection portion between the communicating tube 140 and the second cylindrical portion 114, forms a step, so that the liquid pulled back into the second cylindrical portion 114 remains in the second cylindrical portion 114 due to the step. Therefore, the pulled back liquid can be prevented from falling again into the communicating tube 140 by gravity and flowing out of the outlet 15b, and dripping can be prevented more effectively.

[0075] The other configurations and operations are similar to those of the pump of the first embodiment, and therefore will not be described.

[0076] <<Embodiment 4>> The configuration of the pump 4 of the fourth embodiment will be described with reference to Fig. 10. Figs. 10(a) to (c) are cross-sectional views of the pump 4. In Figs. 10(a) to (c), the same components as those in Fig. 6 of the third embodiment are denoted by the same reference numerals.

[0077] The pump 4 of the fourth embodiment has the same configuration as the pump of the third embodiment, but as shown in Figures 10(a) to (c), a connecting ring 83 is provided inside a mounting ring 80, and a suction tube 84 for sucking up liquid in a container 100 is connected to the connecting ring 83. The pump 4 of the fourth embodiment is configured to be mounted on a container 100 arranged with its spout 100a facing upward. The lower end of the suction tube 84 is inserted into the container 100, and the mounting ring 80 is screwed into the spout 100a at the top of the container 100.

[0078] In the pump 4 of the fourth embodiment, the outlet 15b of the cylindrical portion 15 of the main body 10 is provided in the cylindrical portion 15 at a position shifted from the inlet 15a by a predetermined angle (here, 90 degrees) in the circumferential direction about the central axis 10a. The position where the outlet 15b is provided in the cylindrical portion 15 is a position that does not overlap with the cylindrical membrane 21.

[0079] Other configurations of the pump 4 are similar to those of the pump 3 of the third embodiment, and therefore description thereof will be omitted.

[0080] In the pump 4 of the fourth embodiment, when the user presses the pressure membrane 22 of the diaphragm 20 in the initial state, air is discharged from the outlet 15b. When the user stops pressing, the pressure membrane 22 is urged by the spring 60 to return to the state shown in Fig. 5(b), and the internal space 10b becomes negative pressure. As a result, the cylindrical membrane 21 is drawn into the internal space 10b, the inlet 15a opens, and the liquid in the container 100 is sucked up through the suction tube 84 and filled into the internal space 10b.

[0081] Next, when the user presses the pressing membrane 22, the state of FIG. 5(c) is restored, and the liquid in the internal space 10b flows out from the outlet 15b and is discharged from the discharge nozzle .

[0082] The pump 4 of the fourth embodiment can suck up the liquid in the container 100 located below the pump 2 and discharge it from a discharge port oriented at a predetermined angle. Other effects are similar to those of the pump 3 of the third embodiment, and therefore description thereof will be omitted. [Explanation of symbols]

[0083] 1 Pump 2. Pump 3. Pump 4. Pump 10. Main Unit 10a center axis 10b space 11 Support member 12 Bottom part 15 Cylindrical section 15a Inlet 15b Outlet 15c Recess 17 Space 20 Diaphragm 21 Cylindrical membrane 21a Periphery 22 Pressing Membrane 24 protrusions 30 Inflow pipe 30a center axis 40 Discharge nozzle 41 Aperture 50 Fixing ring 70 Check valve 80 Mounting Ring 81 Gasket 83 Connecting ring 84 Suction tube 90 Outflow pipe 100 containers 100a spout 114 Second cylindrical section 114a aperture 125 Second cylindrical membrane 125a tip 140 Communication pipe

Claims

1. A pump that takes in and discharges liquid from a container, A body and a diaphragm, The main body includes a rigid cylindrical portion and a bottom surface portion covering an opening at one end of the cylindrical portion, The diaphragm includes an elastic cylindrical membrane and a pressure membrane that covers an opening at one end of the cylindrical membrane and is elastic and deformable when pressed by a user; The diaphragm is attached to the main body such that the cylindrical membrane overlaps at least a partial area of ​​an inner circumferential surface of the cylindrical portion of the main body, and the pressing membrane covers an opening at the other end of the cylindrical portion of the main body, The main body is provided with an inlet for taking in the liquid from the container into the internal space of the main body, and an outlet for discharging the liquid taken in the internal space of the main body, the inlet is provided in a region where the cylindrical membrane of the diaphragm overlaps with the inner circumferential surface of the cylindrical portion, and a peripheral portion of the cylindrical membrane is in close contact with the inner wall of the cylindrical portion when the pressing membrane is not deformed, and functions as a valve for opening and closing the inlet; The outlet is provided in a region of the body where the cylindrical membrane of the diaphragm does not overlap. A pump characterized by:

2. 2. The pump according to claim 1, wherein when the pressure membrane of the diaphragm is pressed into the main body in the axial direction of the main body, liquid taken into the internal space of the main body flows out from the outlet, and when the pressure membrane returns to its original position, the pump takes in liquid in the container from the inlet into the internal space of the main body.

3. 2. The pump according to claim 1, wherein when the pressure membrane is not deformed, the gap between the cylindrical membrane and the cylindrical portion is filled in the circumferential direction with the liquid that has flowed in from the inlet, and the peripheral portion of the cylindrical membrane is in close contact with an inner wall, isolating the gap between the cylindrical membrane and the cylindrical portion from the internal space within the main body.

4. 2. The pump according to claim 1, wherein an axial length of the cylindrical portion of the body is greater than an axial length of the cylindrical membrane of the diaphragm, The pump is characterized in that the outlet is provided in a region of the cylindrical portion where the cylindrical membranes do not overlap.

5. 2. The pump according to claim 1, further comprising a spring disposed within said body for biasing said pressure film of said diaphragm in a direction away from said bottom surface portion.

6. 4. The pump according to claim 3, wherein the inlet and outlet are disposed at a predetermined angle in a circumferential direction about an axis of the body.

7. 2. The pump according to claim 1, wherein one end of a second cylindrical portion having a diameter smaller than that of the cylindrical portion is fixed along an axial direction to a center of the bottom surface portion within the main body, and a communication member is disposed between the second cylindrical portion and the outlet port to communicate therebetween, The diaphragm further includes a second cylindrical membrane having an inner diameter smaller than that of the cylindrical membrane, one end of the second cylindrical membrane being fixed to the center of the pressure membrane of the diaphragm, and the other end being inserted so as to contact the inner wall of the second cylindrical portion.

8. 8. The pump according to claim 7, wherein when the pressure film of the diaphragm is pushed into the main body along the axial direction of the main body, the second cylindrical film moves in a direction inserted into the second cylinder in accordance with the movement of the pressure film, and at the same time, the internal space of the main body is compressed, and pressure is applied to the liquid in the internal space, The liquid expands the gap between the second cylindrical membrane and the inner wall of the second cylindrical portion, flows into the inside of the second cylindrical portion, passes through the communicating member, and flows out from the outlet. A pump characterized by:

9. 9. The pump according to claim 8, wherein when the pressure on the pressing membrane of the diaphragm is stopped after the pressing, the pressing membrane restores its shape before being pressed, and the second cylindrical membrane moves in a direction away from the second cylindrical portion as the shape of the pressing membrane is restored, so that a negative pressure is created in the space within the second cylindrical membrane and the second cylindrical portion, and the liquid remaining in the communicating member is drawn back into the second cylindrical portion. A pump characterized by:

10. 10. The pump according to claim 9, wherein a step is provided at a connection between the second cylindrical portion and the communicating member, and the step prevents liquid drawn back into the second cylindrical portion from moving to the communicating member by gravity. A pump characterized by:

11. 2. The pump according to claim 1, wherein an inlet pipe is connected to the inlet, and a discharge nozzle is connected to the outlet.

12. 2. The pump according to claim 1, wherein the cylindrical membrane of the diaphragm is provided on an outer periphery with a protrusion which is fixed to the cylindrical portion of the main body.

13. A spray container having a container and a pump attached to an opening of the container, 13. A spray container, comprising: a pump according to claim 1.

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