Discharge device

Abstract

To provide a pressure-accumulating discharge device which easily achieves a large discharge amount.SOLUTION: A discharge device 1 has: a first cylinder 2; a first piston 3; a second cylinder 4; a second piston 5; a holding member 6; an internal passage 7; a connection part 10 which connects the holding member 6 to the first cylinder 2 so that the holding member 6 is moved forward relative to the second cylinder 4 after being moved forward relative to the first cylinder 2 by external operation and then the holding member 6 is moved backward relative to the second cylinder 4 after being moved backward relative to the first cylinder 2; and a holding member biasing part 11. The first piston 3 has a pressure-accumulating part 9 having an opening / closing port 9a and an opening / closing valve body 9b which cooperates with the opening / closing port 9a to form an opening / closing part 7b. The pressure-accumulating part 9 is elastically deformed so as to open the opening / closing part 7b by increase of an internal pressure of a pump chamber 7a and deformed in a restorative manner so as to close the opening / closing part 7b by reduction in the internal pressure of the pump chamber 7a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a dispenser.

Background Art

[0002] There is known a dispenser having a cylinder, a piston that slides on the cylinder, a holding member that moves forward and backward with respect to the cylinder along with the piston by an external operation, an internal flow path that discharges fluid according to the forward and backward movement of the holding member through a pump chamber defined by the cylinder and the piston, an on-off valve body that cooperates with the piston to form an opening / closing portion of the internal flow path, and a pressure accumulating portion (second spring 54) that applies a biasing force to move the on-off valve body from an open position where the opening / closing portion of the internal flow path is open to a closed position where the opening / closing portion is closed in order to increase the internal pressure of the pump chamber by the forward movement of the holding member (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When attempting to design a conventional pressure accumulating type dispenser as described above to obtain a large discharge (spray) amount, there are problems such as the stroke of the cylinder becoming long and the overall height exceeding a predetermined range, or the diameter of the cylinder becoming large and the operation on the holding member becoming heavy.

[0005] Therefore, an object of the present invention is to provide a pressure accumulating type dispenser that easily realizes a large discharge amount.

Means for Solving the Problems

[0006] One aspect of the present invention is as follows.

[0007] [1] a first cylinder, a 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 that moves forward and backward with respect to the second cylinder along with the first piston, the first cylinder, and the second piston by an external operation, an internal flow path that discharges fluid according to the forward and backward movement of the holding member through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston, a connecting portion that connects the holding member to the first cylinder such that, after the holding member moves forward with respect to the first cylinder along with the first piston by the external operation, the holding member moves forward with respect to the second cylinder along with the first cylinder and the second piston, and then, after the holding member moves backward with respect to the first cylinder, the holding member moves backward with respect to the second cylinder along with the first cylinder and the second piston, a holding member biasing portion that applies a biasing force for the backward movement with respect to the second cylinder to the holding member to move the first cylinder and the second piston backward through the connecting portion, and the first piston has a pressure accumulation portion having an opening / closing port and an opening / closing valve body that cooperates with the opening / closing port to form an opening / closing portion of the internal flow path, the pressure accumulation portion elastically deforms to open the opening / closing portion when the internal pressure of the pump chamber increases due to the forward movement of the first piston with respect to the first cylinder, and restores and deforms to close the opening / closing portion when the internal pressure of the pump chamber decreases due to the backward movement of the first piston with respect to the first cylinder, the discharger.

[0008] [2] The opening / closing valve body elastically deforms to open the opening / closing portion and restores and deforms to close the opening / closing portion, the discharger according to [1].

[0009] [3] The first piston has a first piston body that slides on the first cylinder, an inner cylinder portion that is continuous with the first piston body and has a closed rear end portion, and an outer cylinder portion that is provided radially outside the inner cylinder portion. The inner cylinder portion has the opening / closing port that opens on the outer peripheral surface. The opening / closing valve body has an elastic cylindrical portion that covers the opening / closing port on the outer peripheral surface of the inner cylinder portion. The internal flow path has a flow path between the outer peripheral surface of the opening / closing valve body and the inner peripheral surface of the outer cylinder portion, and is the ejector according to [2].

[0010] [4] The opening / closing valve body has a convex portion that protrudes radially outward from the elastic cylindrical portion so as to tilt rearward by elastic deformation of the elastic cylindrical portion that opens the opening / closing portion. The first cylinder has a contact portion that comes into contact with the convex portion from the front by the forward movement of the first piston with respect to the first cylinder, and is the ejector according to [3].

[0011] [5] The convex portion of the opening / closing valve body is sandwiched in the front-rear direction by the outer cylinder portion and the contact portion by the forward movement of the first piston with respect to the first cylinder, and is the ejector according to [4].

Advantages of the Invention

[0012] According to the present invention, it is possible to provide a pressure accumulation type ejector that can easily achieve a large discharge amount.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

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

[0015] As shown in FIGS. 1 to 5, in one embodiment of the present invention, the ejector 1 includes a first cylinder 2, a 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, a holding member 6 that moves forward and backward with respect to the second cylinder 4 together with the first piston 3, the first cylinder 2, and the second piston 5 by an external operation, an internal flow path 7 that discharges the fluid 8 through a pump chamber 7a defined by the first cylinder 2, the first piston 3, the second cylinder 4, and the second piston 5 according to the forward and backward movement of the holding member 6, an external operation causes the holding member 6 to move forward with respect to the second cylinder 4 together with the first piston 3 after moving forward with respect to the first cylinder 2, and then, after the holding member 6 moves backward with respect to the first cylinder 2, it moves backward with respect to the second cylinder 4 together with the first cylinder 2 and the second piston 5. A connecting portion 10 that connects the holding member 6 to the first cylinder 2, and a holding member urging portion 11 that applies an urging force for the backward movement with respect to the second cylinder 4 to the holding member 6 in order to retract the first cylinder 2 and the second piston 5 via the connecting portion 10. The first piston 3 has a pressure accumulation portion 9 having an opening / closing port 9a and an opening / closing valve body 9b that cooperates with the opening / closing port 9a to form an opening / closing portion 7b of the internal flow path 7. The pressure accumulation portion 9 elastically deforms to open the opening / closing portion 7b when the internal pressure of the pump chamber 7a increases due to the forward movement of the first piston 3 with respect to the first cylinder 2, and restores and deforms to close the opening / closing portion 7b when the internal pressure of the pump chamber 7a decreases due to the backward movement of the first piston 3 with respect to the first cylinder 2.

[0016] According to the above configuration, by an external operation, first, the holding member 6 moves forward with respect to the first cylinder 2 along with the first piston 3, so the internal pressure of the pump chamber 7a is increased. As a result, the accumulator 9 elastically deforms to open the opening / closing part 7b, and the increased internal pressure of the pump chamber 7a can forcefully discharge the fluid 8 to the outside. Then, by further continuing the external operation, the holding member 6 moves forward with respect to the second cylinder 4 along with the first cylinder 2 and the second piston 5, so the opening / closing part 7b is held in the open state (the state shown in FIGS. 2 to 3) by the increased internal pressure of the pump chamber 7a, and the forceful discharge of the fluid 8 can be continued. When the discharge of the fluid 8 ends, the accumulator 9 restores and deforms due to the decrease in the internal pressure of the pump chamber 7a, and the opening / closing part 7b closes. Then, by releasing the external operation, in the state where the opening / closing part 7b is closed, the holding member 6 moves backward with respect to the second cylinder 4 toward the initial position by the biasing force of the holding member biasing part 11, so the internal pressure of the pump chamber 7a decreases, and the fluid 8 can be sucked into the inside of the pump chamber 7a from the upstream side. Thus, according to the above configuration, since the pressure accumulation is first performed by the first cylinder 2 and the first piston 3 on the side with a smaller cross-sectional area during the external operation, the forceful discharge of the fluid 8 can be realized with a light operation from the beginning. Also, since the subsequent discharge uses the second cylinder 4 and the second piston 5 on the side with a larger cross-sectional area, even when designed to obtain a large discharge amount, the increase in the stroke of the cylinder can be suppressed. Therefore, the pressure accumulation type discharger 1 that can easily realize a large discharge amount can be realized. The fluid 8 is, for example, a liquid.

[0017] The opening / closing valve body 9b elastically deforms to open the opening / closing part 7b and restores and deforms to close the opening / closing part 7b. According to the above configuration, the accumulator 9 can be realized with a simple structure in which the opening / closing valve body 9b is formed of an elastic material.

[0018] The first piston 3 has a cylindrical first piston body 3a centered on an axis O that slides on the first cylinder 2, an inner cylinder top wall 3d, and a cylindrical inner cylinder portion 3b centered on the axis O that has a smaller diameter than the first piston body 3a and is connected to the first piston body 3a via an annular reduced-diameter step portion 3g and whose rear end is closed by the inner cylinder top wall 3d, a cylindrical outer cylinder portion 3c centered on the axis O provided radially outside the inner cylinder portion 3b, and a fitting shaft 3e that extends rearward from the inner cylinder top wall 3d and is integrally attached to the inner peripheral surface of the outer cylinder portion 3c by fitting. The inner cylinder portion 3b has two opening / closing ports 9a that open to the outer peripheral surface. The opening / closing valve body 9b has a cylindrical elastic cylindrical portion 9b1 centered on the axis O that is integrally attached to the outer peripheral surface of the fitting shaft 3e by fitting and covers the opening / closing port 9a on the outer peripheral surface of the inner cylinder portion 3b. The internal flow path 7 has, in this order from the opening / closing portion 7b toward the discharge port 7h, a first flow path 7c between the outer peripheral surface of the inner cylinder portion 3b and the inner peripheral surface of the first cylinder 2, a second flow path 7d between the outer peripheral surface of the elastic cylindrical portion 9b1 and the inner peripheral surface of the first cylinder 2, a flow path (third flow path 7e) between the outer peripheral surface of the opening / closing valve body 9b and the inner peripheral surface of the outer cylinder portion 3c, a fourth flow path 7f between the outer peripheral surface of the fitting shaft 3e and the inner peripheral surface of the outer cylinder portion 3c, and a fifth flow path 7g formed radially inside the outer cylinder portion 3c behind the fitting shaft 3e (see the two-dot chain line arrows in FIGS. 2 to 3). The first piston 3 has a plurality (six) of ribs 3h arranged at intervals in the circumferential direction at the corners of the outer surfaces of the inner cylinder portion 3b and the reduced-diameter step portion 3g, and the first flow path 7c passes between the plurality of ribs 3h. In the present embodiment, the inner cylinder portion 3b has a plurality (two) of opening / closing ports 9a provided with circumferentially shifted positions, but it is not limited thereto, and the number of opening / closing ports 9a provided in the inner cylinder portion 3b can be appropriately changed and may be one. The number of ribs 3h provided on the first piston 3 can be appropriately changed and may be a plurality other than six or may be one. Also, a configuration without ribs 3h may be adopted. By providing the ribs 3h, the rigidity of the inner cylinder portion 3b (the portion below the opening / closing port 9a) constituting the opening / closing portion 7b can be ensured, and the stability of the operation of the opening / closing portion 7b can be improved.

[0019] The on-off valve body 9b has a convex portion 9b2 that protrudes radially outward from the elastic cylindrical portion 9b1 so as to tilt rearward due to the elastic deformation of the elastic cylindrical portion 9b1 that opens the opening / closing portion 7b. The first cylinder 2 has a contact portion 2c that contacts the convex portion 9b2 from the front. According to the above configuration, when discharging by the second piston 5 is performed following the discharging by the first piston 3, the contact portion 2c contacting the convex portion 9b2 can maintain the opening / closing portion 7b in an open state, so that the operation on the holding member 6 can be lightened. In the present embodiment, the on-off valve body 9b has a plurality (four) of convex portions 9b2 provided with their positions shifted in the circumferential direction, but it is not limited thereto, and the number of convex portions 9b2 provided on the on-off valve body 9b can be appropriately changed and may be one. In the present embodiment, the plurality of convex portions 9b2 are arranged at intervals in the circumferential direction, and the second flow path 7d of the internal flow path 7 extends through between the plurality of convex portions 9b2.

[0020] The contact portion 2c is constituted by the rear end surface of a circumferential rib 2c1 that protrudes radially inward from the inner peripheral surface of the first cylinder 2. The circumferential rib 2c1 forms, for example, an annular shape centered on the axis O.

[0021] The convex portion 9b2 of the on-off valve body 9b is sandwiched in the front-rear direction by the outer cylinder portion 3c and the contact portion 2c due to the forward movement of the first piston 3 with respect to the first cylinder 2. According to the above configuration, by sandwiching the convex portion 9b2 between the outer cylinder portion 3c and the contact portion 2c, the opening / closing portion 7b can be stably maintained in an open state. The convex portion 9b2 may have a trapezoidal shape that widens radially outward in a longitudinal cross-section including the axis O as in the present embodiment.

[0022] The on-off valve body 9b is formed of rubber or an elastomer, but is not limited thereto. The first piston 3 has a first piston main body member 3i, and the first piston main body member 3i integrally has a first piston main body 3a, a reduced-diameter step portion 3g, a rib 3h, an inner cylinder portion 3b, an inner cylinder top wall 3d, and a fitting shaft 3e. The material forming the first piston main body member 3i is not particularly limited, and for example, it is formed of LDPE (Low Density Polyethylene) or LLDPE (Linear Low Density Polyethylene).

[0023] The second piston 5 is formed of a material softer than the material forming the first cylinder 2. According to the above configuration, it is easy to ensure the rigidity of the first cylinder 2 while ensuring the flexibility of the second piston 5. Therefore, it is easy to suppress the sliding resistance of the second piston 5 with respect to the second cylinder 4, and moreover, it is easy to sufficiently ensure the rigidity of the first cylinder 2 so that the holding member 6 does not come off from the first cylinder 2 at the connecting portion 10 by receiving the biasing force from the holding member biasing portion 11. Note that the material of the second piston 5 is not limited thereto.

[0024] The ejector 1 has a retaining member 12 attached to the second cylinder 4. The first cylinder 2 has a cylindrical first cylinder body 2b centered on the axis O and a protruding portion 2a protruding radially outward from the front end portion of the first cylinder body 2b. The protruding portion 2a abuts against the retaining member 12 by the retracting operation of the holding member 6 with respect to the second cylinder 4. The second piston 5 has a second piston body 5a that slides on the second cylinder 4 and a fitting portion 5b that is continuous with the second piston body 5a and fits into the inner peripheral surface of the first cylinder 2. According to the above configuration, the second piston 5 can be attached to the first cylinder 2 by fitting through the fitting portion 5b. Also, according to the above configuration, when the holding member 6 reaches the limit position of the retracting operation with respect to the second cylinder 4, that is, at the end of the retracting operation, the protruding portion 2a of the first cylinder 2 abuts against the retaining member 12, so that it is possible to suppress the second piston 5 from coming off the first cylinder 2 at the end of the retracting operation. In order to enhance this effect, it may be configured such that the second piston 5 (particularly the second piston body 5a) does not contact the retaining member 12 at the end of the retracting operation. The protruding portion 2a is, for example, in the shape of a flange. The fitting portion 5b is, for example, cylindrical and coaxial with the first cylinder 2 centered on the axis O. The retaining member 12 is, for example, annular and coaxial with the second cylinder 4. The second cylinder 4 is preferably provided coaxially with the first cylinder 2 as shown in the figure.

[0025] The second cylinder 4 has a second cylinder main body 4a and an end wall 4b connected to the front end portion of the second cylinder main body 4a. The second piston 5 has a second piston main body 5a that slides on the second cylinder 4, a fitting portion 5b that fits into the inner peripheral surface of the first cylinder 2, an annular flat plate portion 5c that connects the second piston main body 5a and the fitting portion 5b, and a butting portion 5d that protrudes forward from the annular flat plate portion 5c and abuts against the end wall 4b of the second cylinder 4 by the forward movement of the holding member 6 with respect to the second cylinder 4. According to the above configuration, when the holding member 6 reaches the limit position of the forward movement with respect to the second cylinder 4, that is, at the end of the forward movement, the butting portion 5d of the second piston 5 abuts against the end wall 4b of the second cylinder 4, so that it is possible to suppress the second piston main body 5a from abutting against and deforming the end wall 4b of the second cylinder 4 at the end of the backward movement. In order to enhance this effect, as in the present embodiment, it may be configured such that the second piston main body 5a does not contact the end wall 4b of the second cylinder 4 at the end of the backward movement. The butting portion 5d is a cylindrical intermittent shape coaxial with the cylindrical fitting portion 5b in the present embodiment, but other shapes such as a cylindrical shape without an intermittent portion may also be used.

[0026] The materials forming the first cylinder 2 and the second piston 5 are not particularly limited. For example, the first cylinder 2 is formed of polypropylene or HDPE (High-density polyethylene), and the second piston 5 is formed of LDPE or LLDPE. According to the above configuration, it is particularly easy to realize stable operation.

[0027] The holding member 6 has a nozzle head 6a that discharges the fluid 8 through the internal flow path 7 by receiving a pressing-down operation as an external operation. According to the above configuration, it is possible to realize a nozzle head type accumulative discharge device 1 that is easy to operate even with a large discharge amount. The discharge device 1 may be configured to have an overcap 13 for covering the nozzle head 6a as needed as shown in FIG. 1, or may be configured without the overcap 13.

[0028] The first piston 3 is integrally held by the nozzle head 6a so as to be movable forward and backward by being integrally attached to the nozzle head 6a in the outer cylinder portion 3c. Further, the first piston 3 projects radially outward from the outer cylinder portion 3c and has a pressing portion 3f that can push the first cylinder 2 forward after the first piston 3 advances relative to the first cylinder 2 by an external operation. The outer cylinder portion 3c has a sliding portion 3c1 that slides on the first cylinder. The sliding portion 3c1 is formed in an O-ring shape from a material softer than the material forming the outer cylinder portion 3c. According to the above configuration, it is easy to ensure the rigidity of the outer cylinder portion 3c while suppressing the sliding resistance against the first cylinder 2 by ensuring the flexibility of the sliding portion 3c1. Note that the material and shape of the sliding portion 3c1 are not limited to this.

[0029] The connecting portion 10 is integrally attached to the nozzle head 6a. The holding member biasing portion 11 has a compression spring 11a. The first end portion in the expansion and contraction direction of the compression spring 11a is received by the connecting portion 10, and the second end portion in the expansion and contraction direction of the compression spring 11a is received by the retaining member 12.

[0030] The second cylinder 4 has a flange portion 4c that extends radially outward from the rear end portion of the second cylinder main body 4a. The retaining member 12 has a first contact portion 12a that contacts the rear end surface (upper surface) of the flange portion 4c, a second contact portion 12b that contacts the rear end portion of the inner peripheral surface of the second cylinder main body 4a, and a third contact portion 12c that contacts the outer peripheral surface of the first cylinder 2 so as to allow the first cylinder 2 to advance and retreat with respect to the retaining member 12.

[0031] The end wall 4b of the second cylinder 4 has a suction port 14 for sucking the fluid 8 into the pump chamber 7a, and a backflow prevention portion 15 for suppressing backflow is provided at the suction port 14. The backflow prevention portion 15 may be formed of a ball-shaped valve body 15a as shown in the figure, or may be formed of other valve bodies.

[0032] The discharge port 7h that forms the downstream end portion of the internal flow path 7 can discharge (spray) the fluid 8 in a mist form. According to the above configuration, a pressure accumulation type discharger 1 that can easily achieve a large spray amount can be realized.

[0033] In this embodiment, the discharge container 16 has a discharger 1 and a container body 17. The container body 17 has a mouth portion 17a, a body portion 17b, and a bottom portion in this order, and houses a fluid 8 therein. The discharger 1 has a mounting portion 18 that is mounted on the mouth portion 17a such that the second cylinder 4 is held by the mouth portion 17a, and discharges the fluid 8 inside the container body 17 through the internal flow path 7 by an external operation.

[0034] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

Explanation of Reference Numerals

[0035] 1 Discharger 2 First cylinder 2a Protrusion 2b First cylinder body 2c Contact portion 2c1 Circumferential rib 3 First piston 3a First piston body 3b Inner cylinder portion 3c Outer cylinder portion 3c1 Sliding portion 3d Inner cylinder top wall 3e Fitting shaft 3f Pressing portion 3g Reduced diameter step portion 3h Rib 3i First piston body member 4 Second cylinder 4a Second cylinder body 4b End wall 4c Flange portion 5 Second piston 5a Second piston body 5b Fitting portion 5c Annular flat plate portion 5d Abutting portion 6 Holding member 6a Nozzle head 7 Internal flow path 7a Pump chamber 7b Opening / closing portion 7c First flow path 7d Second flow path 7e Third flow path 7f Fourth flow path 7g Fifth flow path 7h Discharge port 8 Fluid 9 Pressure accumulation part 9a Opening / closing port 9b Opening / closing valve body 9b1 Elastic cylindrical part 9b2 Protrusion 10 Connection part 11 Biasing part of holding member 11a Compression spring 12 Anti-disengagement member 12a First contact part 12b Second contact part 12c Third contact part 13 Overcap 14 Suction port 15 Backflow prevention part 15a Valve body 16 Discharge container 17 Container body 17a Mouth part 17b Barrel part 18 Mounting part O Axis

Claims

1. a first cylinder; a 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 that moves forward and backward with respect to the second cylinder together with the first piston, the first cylinder, and the second piston by an external operation; an internal flow path that discharges fluid according to the forward and backward movement of the holding member through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston; a connecting portion that connects the holding member to the first cylinder such that, after the holding member moves forward with respect to the first cylinder together with the first piston by the external operation, the holding member moves forward with respect to the second cylinder together with the first cylinder and the second piston, and then, after the holding member moves backward with respect to the first cylinder, the holding member moves backward with respect to the second cylinder together with the first cylinder and the second piston; a holding member biasing portion that applies a biasing force for the backward movement with respect to the second cylinder to the holding member to move the first cylinder and the second piston backward through the connecting portion; the first piston has a pressure accumulating portion having an opening / closing port and an opening / closing valve body that cooperates with the opening / closing port to form an opening / closing portion of the internal flow path; the pressure accumulating portion elastically deforms to open the opening / closing portion when the internal pressure of the pump chamber increases due to the forward movement of the first piston with respect to the first cylinder, and restores and deforms to close the opening / closing portion when the internal pressure of the pump chamber decreases due to the backward movement of the first piston with respect to the first cylinder, a discharger.

2. The discharger according to claim 1, wherein the opening / closing valve body elastically deforms to open the opening / closing portion and restores and deforms to close the opening / closing portion.

3. the first piston has a first piston body that slides on the first cylinder, an inner cylinder portion that is continuous with the first piston body and has a closed rear end, and an outer cylinder portion provided radially outside the inner cylinder portion; the inner cylinder portion has the opening / closing port that opens on the outer peripheral surface; the opening / closing valve body has an elastic cylindrical portion that covers the opening / closing port on the outer peripheral surface of the inner cylinder portion; The discharger according to claim 2, wherein the internal flow path has a flow path between the outer peripheral surface of the opening / closing valve body and the inner peripheral surface of the outer cylinder portion.

4. The on-off valve body has a convex portion that protrudes radially outward from the elastic cylindrical portion so as to tilt rearward due to elastic deformation of the elastic cylindrical portion that opens the opening / closing portion. The first cylinder has a contact portion that contacts the convex portion from the front by the forward movement of the first piston with respect to the first cylinder. The ejector according to claim 3.

5. The convex portion of the on-off valve body is sandwiched in the front-rear direction by the outer cylinder portion and the contact portion by the forward movement of the first piston with respect to the first cylinder. The ejector according to claim 4.

Images