Ejector

Abstract

The invention provides an ejector. The ejector (1) has: a first cylinder (24); a first piston (3) that slides on the first cylinder (24); a second cylinder (4) having a larger cross-sectional area than the first cylinder (24); a second piston (25) that slides on the second cylinder (4); a holding member (16) that advances and retreats with respect to the second cylinder (4) in accordance with the first piston (3), the first cylinder (24), and the second piston (25) by an external operation; an internal flow path (18) that discharges fluid through a pump chamber (18a) partitioned by the first cylinder (24), the first piston (3), the second cylinder (4), and the second piston (25) in accordance with the forward and backward movement of the holding member (16); and a pressure accumulation unit (17) that moves the first piston (3) from an open position in which the internal flow path (18) is opened to a closed position in which the internal flow path (18) is closed by a biasing force in a direction that resists an increase in the internal pressure of the pump chamber (18a) due to the forward movement of the holding member (16) with respect to the second cylinder (4). The holding member (16) is operated to advance with the first piston (3) relative to the second cylinder (4) and to advance with the second piston (25) after moving the first piston (3) to the open position.

Description

Technical Field

[0001] The present invention relates to an ejector. Background Art

[0002] A displacer is known, comprising: a first cylinder; a first piston which slides on the first cylinder; a second cylinder having a larger cross-sectional area than that of the first cylinder; a second piston which slides on the second cylinder; a retaining member which, by operation from the outside, advances and retreats with the first piston, the first cylinder, and the second piston relative to the second cylinder; an internal flow path which, in accordance with the advance and retreat action of the retaining member, discharges fluid through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston; and a pressure accumulator which, by a force acting in a direction resisting an increase in the internal pressure of the pump chamber caused by the advancement of the retaining member relative to the second cylinder, causes the first piston to move from an open position which opens the internal flow path to a closed position which closes the internal flow path, wherein the retaining member, after being operated to advance with the first piston, the first cylinder, and the second piston relative to the second cylinder, causes the first piston to move to the open position (see, for example, Patent Document 1).

[0003] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2002-66398 Summary of the invention

[0004] Technical issues If the above-mentioned conventional pressure accumulator-type ejector is designed to obtain a large ejection (spray) volume, there are problems such as a longer cylinder stroke and a more cumbersome operation of the holding member.

[0005] Therefore, an object of the present invention is to provide a pressure accumulation type ejector that can easily achieve a large ejection amount.

[0006] Technical Solution One embodiment of the present invention is as follows. [1] An ejector having: First cylinder; a first piston sliding on the first cylinder; a second cylinder having a cross-sectional area larger than that of the first cylinder; a second piston sliding on the second cylinder; a holding member that moves forward and backward 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 a fluid through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston in accordance with the advancing and retreating motion of the retaining member; and a pressure accumulating unit that moves the first piston from an open position that opens the internal flow path to a closed position that closes the internal flow path by applying a force in a direction that resists an increase in the internal pressure of the pump chamber caused by the advancement of the retaining member relative to the second cylinder, The retaining member advances with the first piston relative to the second cylinder by the operation, and advances with the second piston after the first piston is moved to the open position. [2] According to the displacer described in [1], the retaining member moves forward with the second piston relative to the second cylinder after the first piston moves forward with the first cylinder through the operation. [3] According to the displacer described in [2], the first cylinder has a limiting step portion, and the limiting step portion is used to move the first piston from the closed position to the open position by causing the retaining member to abut against the first piston as the first piston moves forward relative to the first cylinder through the operation. [4] According to the ejector described in [1], the retaining member moves forward relative to the second cylinder along with the first piston and the first cylinder by the operation, and moves forward relative to the second cylinder along with the second piston after the first piston is moved to the open position. [5] According to the ejector described in any one of [1] to [4], the holding member has a cylindrical rod extending in the forward and backward directions, and a piston guide attached to the inner peripheral surface of the rod and having a seated portion. The first piston has a seating portion that is separated from the seated portion at the open position and is seated on the seated portion at the closed position. [6] According to the ejector described in any one of [1] to [5], the discharge port of the internal flow path discharges the fluid in a mist form.

[0013] Technical Effects According to the present invention, it is possible to provide a pressure accumulation type ejector that can easily realize a large ejection amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 1 is a longitudinal sectional view showing a discharge container having a discharger according to a first embodiment of the present invention in a state before operation.

[0015] Figure 2 It indicates that the Figure 1 A longitudinal sectional view showing a state in which a nozzle head for discharging a container is pressed down.

[0016] Figure 3 It is shown from Figure 2 The state shown is a longitudinal sectional view of a state in which the nozzle head is further pressed down.

[0017] Figure 4 It is shown from Figure 3 The state shown is a longitudinal sectional view of a state in which the nozzle head is further pressed down.

[0018] Figure 5 1 is a longitudinal sectional view showing a discharge container having a discharger according to a second embodiment of the present invention in a state before operation.

[0019] Figure 6 It indicates that the Figure 5 A longitudinal sectional view showing a state in which a nozzle head for discharging a container is pressed down.

[0020] Figure 7 It is shown from Figure 6 The state shown is a longitudinal sectional view of a state in which the nozzle head is further pressed down.

[0021] Figure 8 It is shown from Figure 7 The state shown is a longitudinal sectional view of a state in which the nozzle head is further pressed down.

[0022] Fig. 9 1 is a longitudinal sectional view showing a discharge container having a discharger according to a third embodiment of the present invention in a state before operation.

[0023] Fig.10 It indicates that the Fig. 9 A longitudinal sectional view showing a state in which a nozzle head for discharging a container is pressed down.

[0024] Fig.11 It is shown from Fig.10 The state shown is a longitudinal sectional view of a state in which the nozzle head is further pressed down.

[0025] Fig.12 It is shown from Fig.11 The state shown is a longitudinal sectional view of a state in which the nozzle head is further pressed down.

[0026] Explanation of symbols 1 Ejector 2 First cylinder-second piston component 3. First piston 3a Seating area 3b First sliding cylinder 3c First barrel axle 4 Second cylinder 4a Suction port 4b Second cylinder body 4c Flange 4d Bottom of the second cylinder 4e Bottom wall 4f Bottom tube 4g Valve seat 4h Valve restriction 4i Longitudinal Rib 4j Connection wall 5-bar assembly 5a Rod 5b Joint establishment department 5c Snap-on wall 5d Link Wall 5e Upper side support 6 Piston guide 6a Seat 6b Expanded diameter 7 Head body 8 Nozzle plate 9 Anti-drop parts 9a Anti-slip part 9b Protrusion 9c Lower side receiving portion 10 Install the cover 10a Peripheral wall 10b Cover upper part 10c Lower annular wall 10d Outer wall 10e Upper annular wall 10f Inner wall 10g Pressing part 10h surrounding wall 11 Tube 12 Valve body 13 First force-applying member 14 Second force applying member 15 Nozzle Tip 15a Operated part 16. Retaining parts 17 Pressure Accumulator 18 Internal flow path 18a Pump room 18b Upstream flow path 18c Downstream flow path 18d Exhaust 19 Discharge container 20 Container body 20a Mouth 20b Main body 21 Upper cover 21a Outer wall 21b Top wall 22 Seals 23 Suction valve 24 First Cylinder 24a First cylinder body 24b Restriction step 25 Second piston 25a Second sliding cylinder 25b Second barrel axle 25c Annular elastic part 26 snap-fit ​​part 27 Supporting parts 27a outer cylinder 27b Inner tube 27c Connection G1 First Gap G2 Second gap G3 Third Gap O Center axis DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present invention will be described by way of example with reference to the drawings.

[0028] like Figure 1 As shown, in the first embodiment of the present invention, the ejector 1 includes a first cylinder-second piston member 2, a first piston 3, a second cylinder 4, a rod member 5, a piston guide 6, a head body 7, a nozzle sheet 8, a stopper member 9, a mounting cap 10 and a tube 11, each of which is integrally formed of, for example, resin, and a valve body 12, a first force member 13 and a second force member 14, each of which is integrally formed of, for example, metal. The nozzle head 15 is composed of the head body 7 and the nozzle sheet 8, and the holding member 16 is composed of the nozzle head 15, the rod member 5, and the piston guide 6. The pressure storage part 17 is composed of the seat portion 3a of the first piston 3, the seated portion 6a of the piston guide 6, and the first force member 13. It should be noted that the valve body 12, the first force member 13, and the second force member 14 are not limited to metal, and may be made of, for example, resin.

[0029] The ejector 1 has an internal flow path 18 . The internal flow path 18 has a pump chamber 18 a , an upstream flow path 18 b , and a downstream flow path 18 c . The downstream flow path 18 c has a discharge port 18 d .

[0030] In the present embodiment, the discharge container 19 includes the discharger 1 , a container body 20 , and an upper cover 21 .

[0031] The container body 20 has a cylindrical mouth 20a centered on the central axis O of the first cylinder 24 described later, a main body 20b connected to the lower end of the mouth 20a, and a bottom connected to the lower end of the main body 20b. It should be noted that the mouth 20a may also be a cylindrical structure other than a cylindrical shape, such as a square tube. The container body 20 contains a liquid content as a fluid discharged by the discharger 1. It should be noted that the content is not limited to a liquid as long as it is a fluid.

[0032] In this embodiment, the direction along the center axis O is also referred to as the advance and retreat direction or the up and down direction, the direction from the mouth 20a toward the bottom along the advance and retreat direction is also referred to as the forward direction or the downward direction, the opposite direction is also referred to as the backward direction or the upward direction, the direction along the straight line perpendicular to the center axis O is also referred to as the radial direction, the direction surrounding the center axis O is also referred to as the circumferential direction, and the section including the center axis O is also referred to as the longitudinal section.

[0033] The cross-sectional area of ​​the second cylinder 4 (i.e., the cross-sectional area of ​​the inner circumferential surface) is larger than the cross-sectional area of ​​the first cylinder 24. That is, when the second cylinder 4 and the first cylinder 24 are cylindrical, the inner diameter of the second cylinder 4 is larger than the inner diameter of the first cylinder 24. It should be noted that the second cylinder 4 and the first cylinder 24 may also be cylindrical structures other than cylindrical. The second cylinder 4 has a suction port 4a, which is retained at the mouth 20a by mounting the mounting cover 10 on the mouth 20a. In addition, the second cylinder 4 has: a second cylinder body 4b, which is cylindrical with the central axis O as the center and contacts the second piston 25; a flange 4c, which extends radially outward from the upper part of the second cylinder body 4b and is arranged on the upper end surface of the mouth 20a via the seal 22; and a second cylinder bottom 4d, which extends radially inward from the lower part of the second cylinder body 4b and has a suction port 4a.

[0034] The second cylinder bottom 4d has: a bottom wall 4e, which extends radially inward from the lower part of the second cylinder body 4b and is annular with the center axis O as the center; a bottom tube portion 4f, which extends upward from the inner peripheral edge portion of the bottom wall 4e and is cylindrical with the center axis O as the center; a valve seat portion 4g, which extends radially inward from the upper end portion of the bottom tube portion 4f and has a suction port 4a on the center axis O, and seats the valve body 12; a valve limiting portion 4h, which extends upward from the outer peripheral edge portion of the valve seat portion 4g and limits the rise of the valve body 12 separated upward from the valve seat portion 4g; and a plurality of longitudinal ribs 4i, which are arranged at intervals in the circumferential direction and extend in the radial and up and down directions respectively across the portion of the upper surface of the bottom wall 4e other than the peripheral edge portion and the outer peripheral surface of the bottom tube portion 4f.

[0035] The upper end portion of the pipe 11 is mounted on the inner peripheral surface of the bottom cylinder portion 4f by fitting.

[0036] The suction valve 23 is composed of the valve body 12, the valve seat portion 4g, and the valve restriction portion 4h. The suction valve 23 is separated upward from the valve seat portion 4g by the valve body 12, thereby allowing the content to move from the container body 20 to the pump chamber 18a. On the other hand, the suction valve 23 is seated on the valve seat portion 4g downward by the valve body 12, thereby inhibiting the content from moving in the reverse direction. It should be noted that the suction valve 23 is not limited to the structure having the valve body 12, the valve seat portion 4g, and the valve restriction portion 4h, and may be composed of an elastic valve such as a so-called three-point valve.

[0037] The mounting cover 10 includes: a peripheral wall 10a mounted on the outer peripheral surface of the mouth 20a; and a cover upper portion 10b extending radially inward from the upper portion of the peripheral wall 10a to contact the upper surface of the flange 4c and forming an annular shape centered on the central axis O. The cover upper portion 10b includes: a lower annular wall 10c extending radially inward from the upper end portion of the peripheral wall 10a to contact the upper surface of the flange 4c; an outer tube wall 10d extending upward from the inner peripheral edge portion of the lower annular wall 10c; an upper annular wall 10e extending radially inward from the upper end portion of the outer tube wall 10d; and an inner tube wall 10f extending upward and downward from the inner peripheral edge portion of the upper annular wall 10e.

[0038] The first cylinder-second piston member 2 is annular centered on the central axis O, and the upper end portion constitutes the first cylinder 24 and the lower end portion constitutes the second piston 25 .

[0039] The second piston 25 has a second sliding cylinder 25a and a second cylinder shaft 25b. The second sliding cylinder 25a constitutes the outer peripheral edge of the second piston 25 and slides in the up-down direction on the inner peripheral surface of the second cylinder body 4b. The second cylinder shaft 25b constitutes the inner peripheral edge of the second piston 25 in the radial direction and is in the shape of a cylinder extending in the up-down direction. The lower end of the second cylinder shaft 25b is integrally connected to the second sliding cylinder 25a, and the upper end of the second cylinder shaft 25b is integrally connected to the lower end of the first cylinder 24.

[0040] The anti-slip component 9 is annular with the central axis O as the center, and is integrally mounted on the second cylinder 4 to restrict the second piston 25 from slipping out upward from the second cylinder 4. More specifically, the anti-slip component 9 includes: an anti-slip portion 9a having an outer peripheral surface in contact with the inner peripheral surface of the second cylinder body 4b; and a protruding portion 9b protruding radially outward from the upper portion of the anti-slip portion 9a and having a lower surface facing the upper surface of the second cylinder 4. The upper surface of the anti-slip portion 9a includes a lower side receiving portion 9c, which is annular and concave with the central axis O as the center, and receives the lower end of the second force-applying member 14.

[0041] The second piston 25 is restrained from coming out of the second cylinder 4 upward by the second piston 25 abutting against the anti-slip portion 9a upward. The anti-slip member 9 is restrained from being displaced downward relative to the second cylinder 4 by the protrusion 9b abutting against the upper surface of the second cylinder 4 downward. The anti-slip member 9 is restrained from being displaced upward relative to the second cylinder 4 by the portion of the anti-slip portion 9a that is closer to the outer peripheral side than the lower receiving portion 9c abutting against the lower end surface of the inner cylinder wall 10f of the mounting cover 10 upward.

[0042] The second urging member 14 is disposed about the central axis O and is composed of a compression spring that expands and contracts in the up-down direction.

[0043] The first cylinder 24 is annular with the central axis O as the center, and includes a first cylinder body 24a and a limiting step 24b. The first cylinder body 24a is cylindrical with the central axis O as the center, and is in contact with the first piston 3. The limiting step 24b protrudes radially inward in a stepped manner from the lower end of the first cylinder body 24a.

[0044] The holding member 16 is pushed down from the outside via the nozzle head 15 , so that the first piston 3 , the first cylinder 24 , and the second piston 25 advance and retreat (move in the forward and backward directions) relative to the second cylinder 4 .

[0045] In addition, the holding member 16 includes: a rod 5a, which is a cylindrical shape extending in the forward and backward directions with the central axis O as the center; a piston guide 6, which is mounted on the inner peripheral surface of the rod 5a and has a seated portion 6a; and a connecting portion 5b, which is provided integrally connected to the rod 5a at a position radially outside the rod 5a and is urged in the backward direction by the second urging member 14. In addition, the rod member 5 is composed of the rod 5a and the connecting portion 5b.

[0046] The piston guide 6 has a rod shape extending in the advancing and retreating direction around the central axis O. The piston guide 6 has an enlarged diameter portion 6b enlarged below the rod 5a, and the enlarged diameter portion 6b has a seated portion 6a.

[0047] The first piston 3 is annular with the central axis O as the center, and has a first sliding cylinder 3b and a first cylinder shaft 3c. The first sliding cylinder 3b constitutes the outer peripheral edge of the first piston 3 and slides on the inner peripheral surface of the first cylinder body 24a in the forward and backward directions. The first cylinder shaft 3c constitutes the inner peripheral edge of the first piston 3 in the radial direction and is cylindrically extended in the forward and backward directions. The lower end of the first cylinder shaft 3c is integrally connected to the first sliding cylinder 3b. The first cylinder shaft 3c surrounds the outer peripheral surface of the piston guide 6 and advances and retreats relative to the piston guide 6. In addition, the first cylinder shaft 3c slides on the lower end of the outer peripheral surface of the rod 5a in the forward and backward directions.

[0048] The first piston 3 has a seating portion 3 a that is seated on the seated portion 6 a in the advancing direction and separated from the seated portion 6 a in the retreating direction according to the advancing and retreating motion of the holding member 16 .

[0049] The connecting portion 5b of the retaining component 16 includes: a locking wall 5c, which is a tubular shape extending in the forward and backward directions with the central axis O as the center at a position radially farther outward than the rod 5a; a connecting wall 5d, which connects the upper end of the locking wall 5c to the outer peripheral surface of the rod 5a; and an upper side receiving portion 5e, which protrudes radially outward in a stepped manner from the upper end of the outer peripheral surface of the locking wall 5c and receives the upper end of the second force-applying component 14.

[0050] The second urging member 14 urges the first cylinder 24 in the backward direction via the engagement portion 26 of the concave and convex portions between the inner circumferential surface of the engagement wall 5c of the connecting portion 5b and the outer circumferential surface of the first cylinder 24. A first gap G1 of a predetermined size is set between the lower surface of the connecting wall 5d of the connecting portion 5b and the upper end surface of the first cylinder 24.

[0051] The first urging member 13 is composed of a compression spring that is compressed in the advancing and retreating directions by the connecting wall 5 d of the connecting portion 5 b and the first piston 3 .

[0052] The head body 7 is mounted on the upper end of the rod 5a. The nozzle sheet 8 is mounted in a fitting groove provided on the side of the head body 7, and forms a flow path for discharging the contents from the discharge port 18d in a mist form (i.e., spraying) between the nozzle sheet 8 and the head body 7. The upper surface of the head body 7 forms an operated portion 15a that receives a downward pressure operation from the outside. The nozzle head 15 moves forward and backward relative to the second cylinder 4 and the container body 20 in an integrated manner with the holding member 16 according to the downward pressure operation.

[0053] The internal flow path 18 includes a pump chamber 18a, an upstream flow path 18b located upstream of the pump chamber 18a, and a downstream flow path 18c located downstream of the pump chamber 18a. The pump chamber 18a is divided by the first cylinder 24, the first piston 3, the second cylinder 4, and the second piston 25. The upstream flow path 18b is divided by the tube 11. The downstream flow path 18c is divided by the first piston 3, the rod 5a, the piston guide 6, and the nozzle head 15. The discharge port 18d is provided in the nozzle sheet 8 and is located at the most downstream portion of the downstream flow path 18c.

[0054] The pressure accumulating unit 17 moves the first piston 3 from the open position for opening the internal flow path 18 to the closed position for closing the internal flow path 18 by the first urging member 13 acting in the direction (i.e., downward) that resists the increase in the internal pressure of the pump chamber 18a caused by the forward movement of the holding member 16 relative to the second cylinder 4. The seated portion 3a of the first piston 3 is separated from the seated portion 6a of the holding member 16 at the open position, and is seated on the seated portion 6a of the holding member 16 at the closed position located below the open position.

[0055] The first gap G1 in the vertical direction between the lower surface of the connecting wall 5d of the connecting portion 5b and the upper end surface of the first cylinder 24, the second gap G2 in the vertical direction between the lower end of the rod 5a and the first piston 3, the third gap G3 in the vertical direction between the lower end of the first sliding cylinder 3b of the first piston 3 and the upper surface of the limiting step portion 24b, and the force of the first force-applying member 13 are set so that the retaining member 16 moves forward with the first piston 3 relative to the second cylinder 4 by the pressing operation, and moves forward with the second piston 25 after the first piston 3 is moved to the open position. More specifically, the retaining member 16 is set so that after moving with the first piston 3 relative to the first cylinder 24 by the pressing operation, it moves forward with the second piston 25 relative to the second cylinder 4.

[0056] The upper cover 21 opens and closes the ejector 1. The upper cover 21 has a cylindrical outer peripheral wall 21a centered on the central axis O when the upper cover 21 closes the ejector 1, and a top wall 21b connected to the upper end of the outer peripheral wall 21a. The lower end of the outer peripheral wall 21a is detachably mounted on the outer peripheral surface of the outer cylindrical wall 10d of the mounting cover 10.

[0057] Since the ejector 1 of the present embodiment is configured as described above, it operates as follows by a pressing operation.

[0058] like Figure 2 As shown, if the retaining member 16 is moved in the forward direction relative to the second cylinder 4 by a downward pressing operation resisting the force of the second force member 14, first, when the pressure storage unit 17 closes the downstream side flow path 18c by the force from the first force member 13, the retaining member 16 moves forward relative to the first cylinder 24 along with the first piston 3, and the internal pressure of the pump chamber 18a increases.

[0059] like Figure 3 As shown, if the first piston 3 moves from the closed position to the open position by the increased internal pressure of the pump chamber 18a, that is, if the seat portion 3a resists the force from the first force-applying member 13 and separates upward from the seated portion 6a, the contents in the pump chamber 18a that are pressurized flow to the downstream side through the seat portion 3a and the seated portion 6a, and are violently discharged (sprayed) from the discharge port 18d. Therefore, violent spraying is achieved from the initial stage of the downward pressure operation, and as a result, dripping from the discharge port 18d can be suppressed. In addition, in this way, by setting a structure in which the first piston 3 is advanced relative to the first cylinder 24 whose cross-sectional area is smaller than that of the second cylinder 4 before the second piston 25 advances relative to the second cylinder 4, the operating force required for the initial downward pressure operation can be reduced, and spraying can be performed with a light operation.

[0060] By further pressing down, the holding member 16 moves forward relative to the first cylinder 24 to the forward limit position where the connecting portion 5b abuts against the upper end of the first cylinder 24. Figure 4 As shown, the first cylinder 24 is pressed in the forward direction by the connecting portion 5b, so that the retaining member 16 moves forward relative to the second cylinder 4 along with the first cylinder 24 and the second piston 25. As a result, the content in the pump chamber 18a flows to the downstream side through the space between the seat portion 3a and the seated portion 6a, and is violently discharged (sprayed) from the discharge port 18d. Therefore, violent spraying is also achieved after the initial stage of the pressing operation, and as a result, dripping from the discharge port 18d can be suppressed. In addition, at this time, the first piston 3 abuts against the limiting step portion 24b in the forward direction, thereby maintaining the state in which the seat portion 3a is separated from the seated portion 6a in the backward direction, and as a result, the pressing operation is suppressed from becoming heavy.

[0061] When the retaining member 16 reaches the forward limit position relative to the second cylinder 4 along with the second piston 25, the lower end of the second cylindrical shaft 25b comes into contact with the upper surfaces of the plurality of longitudinal ribs 4i, and further forward movement is restricted.

[0062] Furthermore, if the pressing operation is released, first, the holding member 16 is retracted relative to the first cylinder 24 by the force of the second force applying member 14, and the seat portion 3a is seated on the seated portion 6a by the force of the first force applying member 13, so that the downstream side flow path 18c is closed. Then, in this seated state, the holding member 16, the first piston 3, and the first cylinder-second piston member 2 are retracted relative to the second cylinder 4 to the position before the pressing operation by the force of the second force applying member 14. In addition, by this retracting action, the internal pressure of the pump chamber 18a is reduced, so that the suction valve 23 is opened, and the content flows from the inside of the container body 20 into the inside of the pump chamber 18a through the upstream side flow path 18b.

[0063] According to the present embodiment, in the initial stage of the pressing operation, a small amount of content can be accumulated through the pressure accumulation portion 17 and violently discharged by utilizing the first cylinder 24 and the first piston 3 having a smaller cross-sectional area than the second cylinder 4, and after the initial stage of the pressing operation, a large amount of content can be violently discharged by utilizing the second cylinder 4 and the second piston 25, and the operating force can also be reduced. Therefore, according to the present embodiment, a large discharge (spray) amount can be easily achieved while suppressing the cylinder stroke from becoming longer and suppressing the pressing operation from becoming more cumbersome.

[0064] The ejector 1 is not limited to the structure in which the first piston 3 is moved from the closed position to the open position by utilizing the increased internal pressure of the pump chamber 18a as in the present embodiment. Figure 5~Figure 8As in the second embodiment shown, the restricting step 24 b is configured such that the retaining member 16 abuts against the first piston 3 as the first piston 3 moves forward relative to the first cylinder 24 by a depressing operation, thereby moving the first piston 3 from the closed position to the open position.

[0065] According to such a configuration, the timing for moving the first piston 3 from the closed position to the open position can be determined based on the depression stroke rather than the internal pressure of the pump chamber 18 a .

[0066] In addition, the ejector 1 is not limited to the structure in which the holding member 16 moves forward relative to the second cylinder 4 along with the second piston 25 after the first piston 3 moves forward relative to the first cylinder 24 by the pressing operation as in the present embodiment (i.e., the structure in which the first gap G1 exists). For example, the ejector 1 may also be as follows: Figure 9~Figure 12 As in the third embodiment shown, the holding member 16 is configured to move forward relative to the second cylinder 4 along with the first piston 3 and the first cylinder 24 by the pressing operation, and move forward relative to the second cylinder 4 along with the second piston 25 after the first piston 3 moves to the open position.

[0067] Even with such a configuration, the same effect as in the first embodiment can be obtained, that is, the effect of operating the second piston 25 after the first piston 3 is moved from the closed position to the open position by the pressing operation to eject the contents at high pressure.

[0068] It should be noted that in the third embodiment, the portion connecting the lower end of the first cylinder 24 and the second sliding cylinder 25a of the second piston 25 is constituted as an annular elastic portion 25c, and the annular elastic portion 25c can be elastically deformed to allow the first cylinder 24 to move relatively downward relative to the second piston 25. In addition, when the pressing operation is released, the annular elastic portion 25c can transmit the tensile force from the lower end of the first cylinder 24 to the second sliding cylinder 25a of the second piston 25. The second sliding cylinder 25a and the annular elastic portion 25c of the second piston 25 are formed of elastic materials such as rubber or elastomer, and are integrally formed on the lower end of the resin first cylinder 24 by insert molding or the like. The outer cylinder 27a of the support member 27 is arranged inside the second sliding cylinder 25a, and the elastic deformation of the second sliding cylinder 25a to the radial inner side is restricted by the outer cylinder 27a of the support member 27. The support member 27 includes an inner tube 27b, an outer tube 27a, and a connecting portion 27c connecting the inner tube 27b and the outer tube 27a. The connecting portion 27c is composed of a plurality of connecting pieces arranged in a circumferential direction. The inner tube 27b is arranged to be slidable relative to the lower end of the inner circumferential surface of the first cylinder 24.

[0069] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the invention.

[0070] Therefore, the displacer 1 of the above-mentioned embodiment can be modified as long as it is a displacer 1 as follows, which includes: a first cylinder 24; a first piston 3 that slides on the first cylinder 24; a second cylinder 4 whose cross-sectional area is larger than that of the first cylinder 24; a second piston 25 that slides on the second cylinder 4; a holding member 16 that advances and retreats relative to the second cylinder 4 along with the first piston 3, the first cylinder 24, and the second piston 25 by operation from the outside; an internal flow path 18 that discharges fluid through a pump chamber 18a divided by the first cylinder 24, the first piston 3, the second cylinder 4, and the second piston 25 according to the advance and retreat action of the holding member 16; and a pressure accumulation section 17 that moves the first piston 3 from an open position that opens the internal flow path 18 to a closed position that closes the internal flow path 18 by a force in a direction that resists an increase in the internal pressure of the pump chamber 18a caused by the advancement of the holding member 16 relative to the second cylinder 4, and the holding member 16 advances relative to the second cylinder 4 along with the first piston 3 by operation, and advances along with the second piston 25 after the first piston 3 is moved to the open position.

[0071] For example, the ejector 1 is not limited to a structure in which the contents are discharged in a mist form through the discharge port 18d. In addition, the ejector 1 is not limited to a structure in which the second force-applying member 14 applies force to the first cylinder 24 in the backward direction via the engaging portion 26 between the connecting portion 5b and the first cylinder 24. In addition, the ejector 1 is not limited to a structure in which the connecting portion 5b presses the first cylinder 24 in the forward direction at the forward limit position relative to the first cylinder 24. For example, it may also be a structure in which the lower end of the rod 5a presses the first cylinder 24 in the forward direction via the first piston 3 in the open position and the limiting step portion 24b. The first cylinder 24 is not limited to a structure having a limiting step portion 24b. The second cylinder bottom 4d is not limited to a structure having a plurality of longitudinal ribs 4i. The second cylinder bottom 4d is not limited to a structure having a bottom barrel portion 4f. For example, Figure 5 As shown in FIG. 1 and FIG. 2 , the second cylinder bottom 4d may also be configured to include a bottom wall 4e, a valve seat portion 4b located below the bottom wall 4e, and a connecting wall 4j connecting the bottom wall 4e and the valve seat portion 4b. The structure of the cover upper portion 10b of the mounting cover 10 is not limited to the structure including the lower annular wall 10c, the outer cylinder wall 10d, the upper annular wall 10e, and the inner cylinder wall 10f. For example, Figure 5As shown in the figures, it is also possible to have a pressing portion 10g opposed to the upper surface of the flange 4c and the upper surface of the anti-detachment member 9, and a peripheral wall portion 10h protruding upward from the pressing portion 10g at a position radially outward from the nozzle head 15. The pressure storage portion 17 is not limited to a structure having the seated portion 6a of the piston guide 6 and the seated portion 3a of the first piston 3. The second force applying member 14 may also be a structure that applies force to the retaining member 16 in the backward direction via a portion other than the connecting portion 5b. For example, it may be a structure that is disposed between the upper surface of the mounting cover 10 and the lower surface of the nozzle head 15 and applies force to the nozzle head 15 upward.

Claims

1. An ejector, It is characterized in that have: First cylinder; a first piston sliding on the first cylinder; a second cylinder having a cross-sectional area larger than that of the first cylinder; a second piston sliding on the second cylinder; a holding member that moves forward and backward relative to the second cylinder along with the first piston, the first cylinder, and the second piston by external operation; an internal flow path for discharging a fluid through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston in accordance with the advancing and retreating motion of the retaining member; as well as a pressure accumulating unit that moves the first piston from an open position that opens the internal flow path to a closed position that closes the internal flow path by applying a force in a direction that resists an increase in the internal pressure of the pump chamber caused by the advancement of the retaining member relative to the second cylinder, The retaining member advances with the first piston relative to the second cylinder by the operation, and advances with the second piston after the first piston is moved to the open position.

2. The ejector according to claim 1, It is characterized in that The retaining member moves forward with the second piston relative to the second cylinder after the retaining member moves forward with the first piston relative to the first cylinder due to the operation.

3. The ejector according to claim 2, It is characterized in that The first cylinder has a restriction step portion, and the restriction step portion is configured to move the first piston from the closed position to the open position by causing the holding member to come into contact with the first piston as the first piston moves forward relative to the first cylinder through the operation.

4. The ejector according to claim 1, It is characterized in that The retaining member advances with the first piston and the first cylinder relative to the second cylinder by the operation, and advances with the second piston relative to the second cylinder after the first piston is moved to the open position.

5. The ejector according to claim 1, It is characterized in that The holding member includes a cylindrical rod extending in an advancing and retreating direction, and a piston guide attached to an inner peripheral surface of the rod and having a seated portion. The first piston has a seating portion that is separated from the seated portion at the open position and is seated on the seated portion at the closed position.

6. The ejector according to any one of claims 1 to 5, It is characterized in that The discharge port of the internal flow path discharges the fluid in a mist form.

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