Ejector

Abstract

To provide an ejector of a pressure-accumulation type easy to realize a great volume of ejection.SOLUTION: An ejector 1 comprises a hold member 6 that advances / retracts with a first piston 3, a first cylinder 2 and a second piston 5 relatively to a second cylinder 4 by an operation from external and with the first piston 3 relatively to the first cylinder 2 during an advancing / retracting movement relative to the second cylinder 4, an internal flow passage 7 that ejects fluid through a pump chamber 7a demarcated by the first cylinder 2, the first piston 3, the second cylinder 4 and the second piston 5 due to an advancement / retraction of the hold member 6, and a pressure-accumulating part 8 that allows the first piston 3 to elastically deform from a closure shape to close the internal flow passage 7 to an open shape to open the internal flow passage 7 by bringing the first piston 3 into contact with an advancement-regulating portion 2a of the first cylinder 2 before an advancement termination of the second piston 5 due to an advancement of the hold member 6 to increase the internal pressure of the pump chamber 7a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0004] ,

[0006] , , , , , ,

[0005] , , , ,

[0003] , , ,

[0007] , , ,

[0001] The present invention relates to a dispenser.

Background Art

[0002] There is known a dispenser having a cylinder, a piston slidable on the cylinder, a holding member that moves forward and backward with the piston with respect to the cylinder by an external operation, an internal flow path that discharges fluid through a pump chamber defined by the cylinder and the piston by the forward and backward movement of the holding member, and a pressure accumulation portion that moves the piston from a position closing the internal flow path to a position opening the internal flow path by the forward movement of the holding member that increases the internal pressure of the pump chamber (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0008] [2] The discharger according to [1], wherein the forward restricting portion of the first cylinder is configured with a stepped surface that forms a radially offset step on the inner circumferential surface of the first cylinder.

[0009] [3] The discharger according to [1] or [2], having an elastic member that retracts the retaining member relative to the first cylinder.

[0010] [4] The holding member comprises a first stem and a second stem attached to the inner circumferential surface of the first stem. The first piston is held in place by being sandwiched between the first stem and the second stem in the forward and backward direction. The discharger according to any one of [1] to [3], wherein the second stem has an opening that is closed by the closed-shaped first piston and opened by the open-shaped first piston.

[0011] [5] The first piston has an annular opening / closing portion that opens and closes the opening / closing port, and an expanding portion that extends from the opening / closing portion so as to widen radially in the first cylinder toward the forward direction. The discharger according to [4], wherein the opening and closing portion is held by being sandwiched between the first stem and the second stem in the forward and backward direction. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a pressurized discharger that can easily achieve a large discharge volume. [Brief explanation of the drawing]

[0013] [Figure 1] This is a longitudinal cross-sectional view showing a discharge container having a discharger according to one embodiment of the present invention in a state before operation. [Figure 2] This is a partially enlarged view of Figure 1. [Figure 3] Figure 1 is a longitudinal cross-sectional view showing the operating state of the discharge container. [Figure 4] This is a partially enlarged view of Figure 3. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0015] As shown in FIGS. 1 to 4, in one embodiment of the present invention, the ejector 1 includes a first cylinder 2, an elastically deformable first piston 3 that slides on the first cylinder 2, a second cylinder 4 having a larger cross-sectional area than the first cylinder 2, a second piston 5 that slides on the second cylinder 4, and by an external operation, the first piston 3, the first cylinder 2, and the second piston 5 move forward and backward with respect to the second cylinder 4, and during the forward and backward movement with respect to the second cylinder 4, a holding member 6 that moves forward and backward with the first piston 3 with respect to the first cylinder 2, and by the forward and backward movement of the holding member 6, a fluid (not shown) is discharged through an internal flow path 7 defined by the first cylinder 2, the first piston 3, the second cylinder 4, and the second piston 5, and a pressure accumulation portion 8 that elastically deform the first piston 3 from a closed shape (the shape shown in FIG. 1) that closes the internal flow path 7 to an open shape (the shape shown in FIG. 2) that opens the internal flow path 7 by bringing the first piston 3 into contact with the forward movement restricting portion 2a of the first cylinder 2 before the end of the forward movement of the second piston 5 due to the forward movement (downward movement) of the holding member 6 that increases the internal pressure of the pump chamber 7a.

[0016] According to such a configuration, by an external operation on the holding member 6, the first piston 3 moves forward with respect to the first cylinder 2, increases the internal pressure of the pump chamber 7a, then contacts the forward movement restricting portion 2a of the first cylinder 2, elastically deform from the closed shape to the open shape, and the accumulated fluid can be discharged through the internal flow path 7 by opening the internal flow path 7. Also, by continuing the above-described operation with momentum, the second piston 5 can be moved forward with respect to the second cylinder 4 having a larger cross-sectional area than the first cylinder 2, and more fluid can be easily discharged. Therefore, according to the above configuration, the need to increase the stroke of the holding member 6 is reduced, good operability can be realized, and thus a pressure accumulation type ejector 1 with a large discharge amount can be easily realized.

[0017] In the present embodiment, for the sake of convenience of explanation, the advancing and retreating direction is also referred to as the vertical direction, the advancing direction is also referred to as the downward direction, the retreating direction is also referred to as the upward direction, the radial direction of the first cylinder 2, that is, the direction orthogonal to the central axis O of the first cylinder 2 is simply referred to as the radial direction, and the circumferential direction of the first cylinder 2, that is, the direction that goes around the central axis O of the first cylinder 2 is simply referred to as the circumferential direction. Also, the cross-section including the central axis O is also referred to as the longitudinal section.

[0018] The forward restriction portion 2a of the first cylinder 2 is composed of a stepped surface that forms a step that is displaced radially inward on the inner peripheral surface of the first cylinder 2 when viewed in the forward direction. According to such a configuration, the forward restriction portion 2a can be realized with a simple structure. However, the ejector 1 is not limited to such a configuration.

[0019] The ejector 1 has an elastic member (also referred to as the pressure accumulating elastic member 9) that retracts the holding member 6 with respect to the first cylinder 2. According to such a configuration, by appropriately setting the elastic coefficient of the pressure accumulating elastic member 9, an appropriate setting of the pressure accumulation amount (discharge pressure) can be easily realized. However, the ejector 1 is not limited to such a configuration.

[0020] The holding member 6 has a first stem 10a and a second stem 11a attached to the inner peripheral surface of the first stem 10a. The first piston 3 is held by being sandwiched between the first stem 10a and the second stem 11a in the advancing and retreating directions. The second stem 11a has an opening / closing port 7b that is closed by the first piston 3 in the closed shape and opened by the first piston 3 in the open shape. According to such a configuration, the pressure accumulating portion 8 can be realized with a simple structure. However, the ejector 1 is not limited to such a configuration.

[0021] The first piston 3 has an annular opening / closing portion 3a that opens and closes the opening / closing port 7b, and an expanding portion 3b that extends from the opening / closing portion 3a in the forward direction so as to widen radially in the first cylinder 2. The opening / closing portion 3a is held by being sandwiched between the first stem 10a and the second stem 11a in the forward and backward directions. With this configuration, the first piston 3 can be quickly elastically deformed into an open shape by bringing the lower end of the expanding portion 3b into contact with the forward movement restricting portion 2a as it moves forward. However, the discharger 1 is not limited to this configuration.

[0022] When the first piston 3 is in a closed position, the opening / closing portion 3a of the first piston 3 is held in place by being sandwiched between the stem stepped surface 11b, which forms a step on the outer circumferential surface of the second stem 11a that is shifted radially outward when viewed in the forward direction, and the forward-side end face 10e of the first stem 10a, and the opening / closing port 7b is closed by the inner circumferential surface of the opening / closing portion 3a. With this configuration, stable operation of the first piston 3 can be achieved. However, the discharger 1 is not limited to this configuration.

[0023] When the first piston 3 is in a closed configuration, the enlarged portion 3b has a straight cylindrical portion 3c that extends from the radially outer portion of the opening / closing portion 3a along the forward and backward directions, and an enlarged cylindrical portion 3d that gradually widens radially toward the forward direction from the forward end of the straight cylindrical portion 3c. In the closed configuration, the inner circumferential surface of the opening / closing portion 3a contacts the outer circumferential surface of the second stem 11a, the inner circumferential surface of the enlarged portion 3b contacts the outer circumferential surface of the second stem 11a, the outer circumferential surface of the opening / closing portion 3a and the outer circumferential surface of the straight cylindrical portion 3c are spaced apart from the inner circumferential surface of the first cylinder 2, and the outer circumferential surface of the enlarged cylindrical portion 3d contacts the inner circumferential surface of the first cylinder 2. With such a configuration, stable operation of the first piston 3 can be more reliably achieved. However, the discharger 1 is not limited to this configuration.

[0024] The detailed configuration of the discharger 1 is described below, but the discharger 1 is not limited to this configuration.

[0025] The discharger 1 has a container-side member 13 that has a second cylinder 4 and is held in the container 12, a head-side member 14 that has a discharge head 15 and a holding member 6, an elastic member (also called a return elastic member 16) that retracts the holding member 6 to its initial position, and an overcap 17. The return elastic member 16 is made of a compression spring. The discharger 1 and the container 12 constitute a handheld discharge container 18.

[0026] The container 12 has a mouth 12a, a body 12b, and a bottom. The contents of the container 12 are liquid, and the discharge form from the discharge head 15 is a mist. However, the discharge form is not limited to a mist, and the contents are not limited to a liquid.

[0027] The head-side member 14 includes a discharge head 15, a first stem member 10, a second stem member 11, a first piston 3, a first cylinder / second piston member 19, and a pressure-accumulating elastic member 9.

[0028] The discharge head 15 has an upper surface that receives a downward operation and a discharge port 7c for the contents, and is attached to the upper end of the first stem 10a. The discharge port 7c constitutes the downstream part of the internal flow path 7.

[0029] The first stem member 10 has a first stem 10a and an outer peripheral connecting portion 10b provided radially outward from the first stem 10a and integrally connected to the first stem 10a. The outer peripheral connecting portion 10b is positioned to be able to move forward relative to the first cylinder 2 by a predetermined stroke from the initial state before the pushing operation toward the discharge head 15 until the first piston 3 elastically deforms into an open shape. The outer peripheral connecting portion 10b also has a hooking portion 10c that catches on the outer peripheral surface of the first cylinder 2 and pulls it up so that the first cylinder 2 returns to its initial state from the pushed-down state. The outer peripheral connecting portion 10b also has a first upper receiving portion 10d that receives the upper end of the return elastic member 16.

[0030] The second stem member 11 has a second stem 11a, a bottom wall 11c that closes the lower end of the second stem 11a, and a second upper receiving portion 11d that receives the upper end of the pressure-accumulating elastic member 9. The pressure-accumulating elastic member 9 is made of a compression spring. From the viewpoint of operability, it is preferable that the elastic modulus of the pressure-accumulating elastic member 9 is smaller than the elastic modulus of the return elastic member 16. The opening 7b of the second stem 11a is made up of a plurality of through holes arranged in the circumferential direction.

[0031] The first cylinder / second piston member 19 integrally comprises the first cylinder 2 and the second piston 5. The first cylinder 2 is cylindrical with a central axis O. However, the first cylinder 2 is not limited to a cylindrical shape and may have a cylindrical configuration other than a cylindrical shape. The first cylinder 2 has a second lower receiving portion 2b below the stepped surface that receives the lower end of the pressure accumulation elastic member 9. The second piston 5 extends radially outward from the lower end of the first cylinder 2 and forms an annular shape concentric with the first cylinder 2.

[0032] The container-side member 13 includes a second cylinder member 20, a pipe 21, a retaining member 22, and a mounting cap 23.

[0033] The second cylinder member 20 includes a second cylinder 4, a pipe holding portion 20a, a backflow suppression portion 20b, and a flange 20c. The second cylinder 4 is cylindrical and coaxial with the first cylinder 2. The pipe holding portion 20a holds the pipe 21. The pipe 21 can pass the contents of the container 12 toward the pump chamber 7a. A backflow suppression portion 20b is provided between the lower end of the second cylinder 4 and the pipe holding portion 20a to suppress backflow of the internal flow path 7. The backflow suppression portion 20b is composed of a ball valve, but is not limited to this. The flange 20c extends radially outward from the upper end of the second cylinder 4. A configuration without the pipe 21 is also possible.

[0034] The retaining member 22 is annular in shape concentric with the first cylinder 2 and is attached to the second cylinder member 20 so as to contact the inner circumferential surface and the upper end surface of the upper end of the second cylinder 4. The retaining member 22 also has a first lower receiving portion 22a that receives the lower end of the return elastic member 16.

[0035] The mounting cap 23 has a mounting cylinder 23a attached to the outer circumferential surface of the mouth 12a of the container 12, and a cap upper part 23b connected to the upper end of the mounting cylinder 23a. The packing 24, flange 20c, and the outer circumferential part of the retaining member 22 are held in place by being sandwiched between the lower surface of the cap upper part 23b and the upper end surface of the mouth 12a of the container 12. The cap upper part 23b has a fitting portion 23c into which the overcap 17 is detachably fitted.

[0036] The internal flow path 7 is composed of the inside of the pipe 21, the pump chamber 7a, the opening / closing port 7b, the inside of the second stem 11a, the inside of the first stem 10a, and the inside of the discharge head 15 (including the discharge port 7c).

[0037] The first piston 3 is formed of, for example, rubber or elastomer. The first stem member 10, the second stem member 11, the first cylinder / second piston member 19, and the second cylinder member 20 are made of, for example, synthetic resin. The pressure accumulation elastic member 9 and the return elastic member 16 are made of metal, but are not limited to metal; they may also be made of, for example, synthetic resin.

[0038] The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from its essence.

[0039] Therefore, the discharger 1 of the above-described embodiment includes a first cylinder 2, an elastically deformable first piston 3 that slides on the first cylinder 2, a second cylinder 4 having a larger cross-sectional area than the first cylinder 2, a second piston 5 that slides on the second cylinder 4, and a holding member 6 that moves back and forth relative to the second cylinder 4 with the first piston 3, the first cylinder 2 and the second piston 5 by external operation, and moves back and forth relative to the first cylinder 2 with the first piston 3 during the movement relative to the second cylinder 4, and the movement of the holding member 6 As long as the discharger 1 has an internal passage 7 that discharges fluid through a pump chamber 7a partitioned by a first cylinder 2, a first piston 3, a second cylinder 4, and a second piston 5, and a pressure accumulation section 8 that elastically deforms the first piston 3 from a closed shape that closes the internal passage 7 to an open shape that opens the internal passage 7 by bringing the first piston 3 into contact with the forward-restricting section 2a of the first cylinder 2 before the second piston 5 finishes moving forward, the discharger 1 can be modified. [Explanation of Symbols]

[0040] 1 Dispenser 2. First cylinder 2a Advance restriction section 2b Second lower receiving part 3. First piston 3a Opening / closing section 3b Enlarged part 3c Straight cylindrical part 3D Magnifying Tube 4. Second Cylinder 5. Second piston 6. Retaining member 7 Internal flow path 7a Pump Room 7b Opening / Closing 7c outlet 8. Pressure Accumulator 9. Elastic member for pressure accumulation 10 First stem member 10a First stem 10b Outer connection part 10c snagging part 10d First upper receiving part 10e Advance side end face 11. Second stem member 11a Second stem 11b Stem step surface 11c bottom wall 11d Second upper receiving part 12 containers 12a Mouth 12b Torso 13 Container side member 14 Head-side component 15 Discharge head 16 Elastic member for recovery 17 Overcap 18 Discharge container 19. First cylinder and second piston component 20 Second cylinder member 20a Pipe holding part 20b Backflow suppressor 20c flange 21 pipes 22 Retaining member 22a First lower receiving portion 23. Mounting cap 23a Mounting tube 23b Top of cap 23c Mating part 24 Gasket O center axis

Claims

1. First cylinder and An elastically deformable first piston that slides on the first cylinder, A second cylinder having a larger cross-sectional area than the first cylinder, A second piston that slides on the second cylinder, A holding member moves back and forth relative to the second cylinder by external operation, accompanied by the first piston, the first cylinder, and the second piston, and moves back and forth relative to the first cylinder accompanied by the first piston during the movement relative to the second cylinder, As the holding member moves forward and backward, an internal flow path is formed that discharges fluid through a pump chamber partitioned by the first cylinder, the first piston, the second cylinder, and the second piston. A discharger having a pressure accumulation section which, by advancing the holding member that increases the internal pressure of the pump chamber, causes the first piston to come into contact with the forward-moving restricting section of the first cylinder before the second piston finishes moving forward, thereby elastically deforming the first piston from a closed shape that closes the internal passage to an open shape that opens the internal passage.

2. The discharger according to claim 1, wherein the forward regulating portion of the first cylinder is composed of a stepped surface that forms a radially offset step on the inner circumferential surface of the first cylinder.

3. The discharger according to claim 1, further comprising an elastic member for retracting the holding member relative to the first cylinder.

4. The holding member comprises a first stem and a second stem attached to the inner circumferential surface of the first stem. The first piston is held in place by being sandwiched between the first stem and the second stem in the forward and backward direction. The discharger according to claim 1, wherein the second stem has an opening that is closed by the closed-shaped first piston and opened by the open-shaped first piston.

5. The first piston has an annular opening / closing portion that opens and closes the opening / closing port, and an expanding portion that extends from the opening / closing portion so as to widen radially in the first cylinder toward the forward direction. The discharger according to claim 4, wherein the opening and closing portion is held by being sandwiched between the first stem and the second stem in the forward and backward direction.

Images