Ejector

Abstract

To provide an accumulation type discharge device that can achieve a large discharge amount and a stable operation easily.SOLUTION: A discharge device 1 includes: a first cylinder 2; a first piston 3; a second cylinder 4; a second piston 5; a holding member 6; an internal flow passage 7; an accumulation part 9; a connection part 10 for connecting the holding member 6 to the first cylinder 2 so that by an external operation, the holding member 6 performs a forward operation for the second cylinder 4 along with the first cylinder 2 and the second piston 5 after advancing for the first cylinder 2 along with the first piston 3, and then the holding member 6 performs a backward operation for the second cylinder 4 along with the first cylinder 2 and the second piston 5 after backing for the first cylinder 2; and a holding member energizing part 11 for imparting energizing force to the holding member 6 for a backward operation for the second cylinder 4 so as to back the first cylinder 2 and the second piston 5 through the connection part 10. Young's modulus of the second piston 5 is smaller than Young's modulus of the first cylinder 2.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 first cylinder, a first piston sliding on the first cylinder, a second cylinder having a larger cross-sectional area than the first cylinder, a second piston sliding 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, and a pressure accumulation unit that applies a biasing force to move the first piston from an open position where the opening / closing portion of the internal flow path is opened to a closed position where the opening / closing portion is closed in order to increase the internal pressure of the pump chamber when the holding member moves forward (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] Conventional pressurized dischargers, as described above, have problems such as requiring a long cylinder stroke and heavy operation of the retaining member when designed to obtain a large discharge (spray) volume. This problem can be addressed by further equipping the discharger with a connection part that connects the retaining member to the first cylinder, and a retaining member biasing part that provides a biasing force to the retaining member for the backward movement toward the second cylinder in order to move the first cylinder and second piston backward via the connection part. This configuration allows the retaining member to move forward relative to the first cylinder with the first piston, then move forward relative to the second cylinder with the first and second pistons, and then move backward relative to the first cylinder, with the first and second pistons. However, with this alone, depending on the type of fluid, the sliding resistance of the second piston relative to the second cylinder may become excessive, leading to malfunction.

[0005] Therefore, the objective of the present invention is to provide a pressurized discharger that easily achieves a large discharge volume and stable operation. [Means for solving the problem]

[0006] One embodiment of the present invention is as follows:

[0007] [1] First cylinder and 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 back and forth relative to the second cylinder, along with the first piston, the first cylinder, and the second piston, by external operation, An internal flow path that discharges fluid through a pump chamber partitioned by the first cylinder, the first piston, the second cylinder, and the second piston in accordance with the forward and backward movement of the holding member, A pressure accumulation unit provides a biasing force to move the first piston from an open position to a closed position to close the opening / closing part of the internal flow path, in order to increase the internal pressure of the pump chamber by the forward movement of the retaining member relative to the second cylinder, A connection portion connects the holding member to the first cylinder such that, upon external operation, the holding member moves forward relative to the first cylinder with the first piston, then moves forward relative to the second cylinder with the first cylinder and the second piston, and then moves backward relative to the first cylinder with the first cylinder and the second piston. The holding member biasing portion provides the holding member with a biasing force for the retraction movement of the second cylinder in order to retract the first cylinder and the second piston via the connecting portion, A discharger in which the Young's modulus of the second piston is smaller than that of the first cylinder.

[0008] [2] The second cylinder has a retaining member attached to it, The forward end of the first cylinder has a projection that protrudes radially outward, The protruding portion abuts against the retaining member due to the retraction movement of the retaining member relative to the second cylinder. The discharger according to [1], wherein the second piston has a second piston body that slides on the second cylinder and a fitting portion connected to the second piston body that fits into the inner circumferential surface of the first cylinder.

[0009] [3] The second cylinder comprises a second cylinder body and an end wall connected to the forward end of the second cylinder body. The discharger according to [1] or [2], wherein the second piston comprises a second piston body that slides on the second cylinder, a fitting portion that fits onto the inner circumferential surface of the first cylinder, an annular flat plate portion connecting the second piston body and the fitting portion, and a stop portion that protrudes forward from the annular flat plate portion and abuts against the end wall of the second cylinder due to the forward movement of the holding member relative to the second cylinder. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a pressurized discharger that easily achieves a large discharge volume and stable operation. [Brief explanation of the drawing]

[0011] [Figure 1] This is a cross-sectional view showing a discharge container having a discharger according to one embodiment of the present invention in an unused state. [Figure 2] Figure 1 is a cross-sectional view showing the state of the holding member in the discharge container at the start of its forward movement. [Figure 3] This is a cross-sectional view showing a state where the forward movement has progressed further from the state shown in Figure 2. [Figure 4] This is a cross-sectional view showing a state where the forward movement has progressed further from the state shown in Figure 3. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0013] As shown in Figures 1 to 4, in one embodiment of the present invention, the discharger 1 includes a first cylinder 2, a first piston 3 sliding on the first cylinder 2, a second cylinder 4 having a larger cross-sectional area than the first cylinder 2, a second piston 5 sliding on the second cylinder 4, a holding member 6 that moves forward and backward relative to the second cylinder 4 along with the first piston 3, the first cylinder 2, and the second piston 5 by external operation, an internal passage 7 that discharges fluid 8 through a pump chamber 7a partitioned by the first cylinder 2, the first piston 3, the second cylinder 4, and the second piston 5 in accordance with the forward and backward movement of the holding member 6, and the first piston 3 being moved to an open position that opens the opening / closing portion 7b of the internal passage 7 in order to increase the internal pressure of the pump chamber 7a by the forward movement of the holding member 6 relative to the second cylinder 4. The device includes a pressure accumulation unit 9 that provides a biasing force to move the opening / closing unit 7b from its position to the closed position, a connection unit 10 that connects the holding member 6 to the first cylinder 2 so that, by external operation, the holding member 6 moves forward relative to the first cylinder 2 with the first piston 3, then moves forward relative to the second cylinder 4 with the first cylinder 2 and the second piston 5, and then moves backward relative to the first cylinder 2 with the first cylinder 2 and the second piston 5, and a holding member biasing unit 11 that provides a biasing force to the holding member 6 for the backward movement relative to the second cylinder 4 in order to move the first cylinder 2 and the second piston 5 backward via the connection unit 10, wherein the Young's modulus of the second piston 5 is smaller than the Young's modulus of the first cylinder 2.

[0014] According to the above configuration, by an external operation, first, the holding member 6 advances with the first piston 3 relative to the first cylinder 2, thereby increasing the internal pressure of the pump chamber 7a. As a result, the first piston 3 is moved from the closed position to the open position against the biasing force of the accumulator portion 9, and the fluid 8 can be vigorously discharged to the outside by the increased internal pressure of the pump chamber 7a. Then, by further continuing the external operation, the holding member 6 moves forward with respect to the second cylinder 4 together with the first cylinder 2 and the second piston 5. Therefore, the first piston 3 is held in the open position by the increased internal pressure of the pump chamber 7a, and the vigorous discharge of the fluid 8 can be continued. Then, by releasing the external operation, the holding member 6 is caused to move backward with respect to the second cylinder 4 by the biasing force of the holding member biasing portion 11 and return to the initial position. At this time, due to the decrease in the internal pressure of the pump chamber 7a, 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 discharge of the fluid 8 with good momentum can be realized from the beginning with a light operation. Further, since the second cylinder 4 and the second piston 5 on the side with a larger cross-sectional area are used for the subsequent discharge, even when designed to obtain a large discharge amount, it is possible to suppress an increase in the stroke of the cylinder. The fluid 8 is, for example, a liquid.

[0015] Also, according to the above configuration, since the Young's modulus of the second piston 5 is smaller than that of the first cylinder 2, it is easier 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.

[0016] Therefore, according to the above configuration, it is possible to realize the pressure accumulation type discharger 1 that can easily achieve a large discharge amount and a stable operation.

[0017] The ejector 1 has a retaining member 12 attached to the second cylinder 4. The forward end of the first cylinder 2 has a protruding portion 2a that protrudes radially outward. The protruding portion 2a abuts against the retaining member 12 by the backward movement 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 backward movement with respect to the second cylinder 4, that is, at the end of the backward movement, 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 backward movement. In order to enhance this effect, the second piston 5 (particularly the second piston body 5a) may be configured not to contact the retaining member 12 at the end of the backward movement. The protruding portion 2a is, for example, in the shape of a flange. The fitting portion 5b is, for example, in the shape of a cylinder coaxial with the first cylinder 2 centered on the axis O. The retaining member 12 is, for example, in the shape of an annular coaxial with the second cylinder 4. The second cylinder 4 is preferably provided coaxially with the first cylinder 2 as shown in the figure.

[0018] The second cylinder 4 has a second cylinder body 4a and an end wall 4b connected to the forward end of the second cylinder body 4a. The second piston 5 has a second piston body 5a that slides on the second cylinder 4, a fitting portion 5b that fits onto the inner circumferential surface of the first cylinder 2, an annular flat plate portion 5c connecting the second piston body 5a and the fitting portion 5b, and a stopper portion 5d that protrudes forward from the annular flat plate portion 5c and abuts against the end wall 4b of the second cylinder 4 due to the forward movement of the holding member 6 relative to the second cylinder 4. With the above configuration, when the holding member 6 reaches the limit position of its forward movement relative to the second cylinder 4, that is, at the end of the forward movement, the stopper portion 5d of the second piston 5 abuts against the end wall 4b of the second cylinder 4, so that deformation of the second piston body 5a by abutting against the end wall 4b of the second cylinder 4 at the end of the retraction movement can be suppressed. To enhance this effect, the second piston body 5a may be configured not to contact the end wall 4b of the second cylinder 4 when the retraction operation is completed. In this embodiment, the abutment portion 5d is a coaxial, intermittent cylindrical shape with respect to the cylindrical fitting portion 5b, but it may be a cylindrical shape without an intermittent portion or other shapes.

[0019] The first cylinder 2 is made of, for example, polypropylene or HDPE (high-density polyethylene), and the second piston 5 is made of, for example, LDPE (low-density polyethylene) or LLDPE (linear low-density polyethylene). With the above configuration, stable operation can be particularly easily achieved.

[0020] The holding member 6 has a nozzle head 6a that discharges fluid 8 through the internal passage 7 when subjected to a downward operation as an external operation. With the above configuration, a nozzle head type pressurized discharger 1 that is easy to operate even with a large discharge volume can be realized. As shown in Figure 1, the discharger 1 may have an overcap 13 to cover the nozzle head 6a as needed, or it may have a configuration without an overcap 13.

[0021] The holding member 6 has a stem 6b and a piston guide 6c attached to the inner circumferential surface of the stem 6b. The first piston 3 is held by the stem 6b and the piston guide 6c so that it can move forward and backward. The opening and closing portion 7b of the internal passage 7 is formed by the seating portion 3a of the first piston 3 and the seated portion 6c1 of the piston guide 6c. The pressure accumulator 9 has a first compression spring 9a that biases the seating portion 3a of the first piston 3 toward the seated portion 6c1 of the piston guide 6c. With the above configuration, the structure of the pressure accumulator 9 can be simplified.

[0022] The retaining member 6 has a cylinder retaining portion 6d that is connected to the outer circumferential surface of the stem 6b and holds the first cylinder 2 so that it can move forward and backward. The connecting portion 10 has the cylinder retaining portion 6d, and the retaining member biasing portion 11 has a second compression spring 11a. The first end of the second compression spring 11a in the direction of expansion and contraction is supported by the first cylinder 2 retaining portion, and the second end of the second compression spring 11a in the direction of expansion and contraction is supported by the retaining member 12. With the above configuration, the structure of the connecting portion 10 and the retaining member biasing portion 11 can be simplified.

[0023] The second cylinder 4 has a flange portion 4c extending radially outward from the retracted end of the second cylinder body 4a, and the retaining member 12 has a first contact portion 12a that contacts the retracted surface (upper surface) of the flange portion 4c, a second contact portion 12b that contacts the retracted end of the inner circumferential surface of the second cylinder body 4a, and a third contact portion 12c that contacts the outer circumferential surface of the first cylinder 2 to allow the first cylinder 2 to move forward and backward relative to the retaining member 12. With the above configuration, stable placement of the retaining member 12 and a guiding function of the first cylinder 2 by the retaining member 12 can be realized.

[0024] The end wall 4b of the second cylinder 4 has a suction port 14 for drawing fluid 8 into the pump chamber 7a, and the suction port 14 is provided with a backflow suppression part 15 to suppress backflow. With the above configuration, the structure of the discharger 1 can be simplified. The backflow suppression part 15 may be formed of a ball-shaped valve body 15a as shown in the figure, or it may be formed of other valve bodies 15a.

[0025] The discharge port 7c, which forms the downstream end of the internal flow path 7, can discharge (spray) the fluid 8 in a mist form. With the above configuration, a pressurized discharger 1 that can easily achieve a large spray volume and stable operation can be realized.

[0026] In this embodiment, the discharge container 16 comprises 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 connected in that order, and contains a fluid 8 inside. The discharger 1 has a mounting portion 18 that is attached to the mouth portion 17a so that the second cylinder 4 is held in the mouth portion 17a, and discharges the fluid 8 inside the container body 17 through the internal flow path 7 by external operation. With the above configuration, a pressurized discharge container 16 that can easily achieve a large spray volume and stable operation can be realized.

[0027] The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from its essence. [Explanation of symbols]

[0028] 1 Dispenser 2. First cylinder 2a Protrusion 3. First piston 3a Seating area 4. Second Cylinder 4a Second Cylinder Body 4b End wall 4c flange section 5. Second piston 5a Second piston body 5b Mating part 5c Annular plate section 5d Buttocks 6. Retaining member 6a Nozzle head 6b stem 6c Piston Guide 6c1 Seated part 6d Cylinder holding part 7 Internal flow path 7a Pump Room 7b Opening / Closing Section 7c outlet 8 fluid 9. Pressure Accumulator 9a First compression spring 10 Connection part 11. Holding member biasing part 11a Second compression spring 12 Retaining member 12a 1st contact part 12b 2nd contact part 12c 3rd contact part 13 Overcap 14 Inlet 15 Backflow suppression part 15a Valve body 16 Discharge container 17 Container body 17a Mouth 17b Torso 18 Mounting part O axis

Claims

1. First cylinder and 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 back and forth relative to the second cylinder, along with the first piston, the first cylinder, and the second piston, by external operation, An internal flow path that discharges fluid through a pump chamber partitioned by the first cylinder, the first piston, the second cylinder, and the second piston in accordance with the forward and backward movement of the holding member, A pressure accumulation unit provides a biasing force to move the first piston from an open position, which opens the opening / closing part of the internal passage, to a closed position, in order to increase the internal pressure of the pump chamber by the forward movement of the holding member relative to the second cylinder, The connection portion that connects the holding member to the first cylinder such that, upon external operation, the holding member moves forward relative to the first cylinder with the first piston, then moves forward relative to the second cylinder with the first cylinder and the second piston, and thereafter moves backward relative to the first cylinder, then moves backward relative to the second cylinder with the first cylinder and the second piston, The holding member biasing portion provides the holding member with a biasing force for the retraction movement of the second cylinder in order to retract the first cylinder and the second piston via the connecting portion, A discharger in which the Young's modulus of the second piston is smaller than that of the first cylinder.

2. The second cylinder has a retaining member attached to it, The forward end of the first cylinder has a projection that protrudes radially outward, The protruding portion abuts against the retaining member due to the retraction movement of the retaining member relative to the second cylinder. The discharger according to claim 1, wherein the second piston has a second piston body that slides on the second cylinder and a fitting portion connected to the second piston body that fits into the inner circumferential surface of the first cylinder.

3. The second cylinder comprises a second cylinder body and an end wall connected to the forward end of the second cylinder body. The discharger according to claim 1, wherein the second piston comprises a second piston body that slides on the second cylinder, a fitting portion that fits onto the inner circumferential surface of the first cylinder, an annular flat plate portion connecting the second piston body and the fitting portion, and a stop portion that protrudes forward from the annular flat plate portion and abuts against the end wall of the second cylinder due to the forward movement of the holding member relative to the second cylinder.

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