WO2021039132A1

WO2021039132A1 - Pump-type ejection device

Info

Publication number: WO2021039132A1
Application number: PCT/JP2020/026443
Authority: WO
Inventors: 阿部　和也; 悠矢島
Original assignee: 大和製罐株式会社
Priority date: 2019-08-29
Filing date: 2020-07-06
Publication date: 2021-03-04
Also published as: JP7289758B2; CN114555485A; CN114555485B; TWI770594B; JP2021031155A; TW202108472A

Abstract

The present invention addresses the problem of providing a pump-type ejection device capable of reducing foam dripping or liquid dripping with a simple configuration. In a pump-type ejection device (1) provided with a cylinder (19), a piston (31), a flow path (P) formed to penetrate the piston (31), a shaft-shaped member (36) inserted into the flow path (P), a valve body (37) formed at one end of the shaft-shaped member (36), a valve seat part (38) formed to adhere to the valve body (37) to close the flow path (P), and a protruding part (30) contacting the valve body (37) when the piston (31) moves in a direction to decrease the volume of a space (34), an immovable region (C2) that maintains a state in which the shaft-shaped member (36) is stopped with respect to the cylinder (19) and the valve body (37) and the valve seat part (38) are isolated is set so that a nozzle (11) is caused to perform suction by a negative pressure as the volume of the space (34) increases when the piston (31) is moved in a direction to increase the volume of the space (34) by a restoration mechanism (35).

Description

Pump type discharge device

The present invention relates to a pump-type discharge device that discharges a liquid extruded from a cylinder through a discharge hole of the nozzle body by pushing down the nozzle body to reduce the internal volume.

An example of this type of device is described in Japanese Patent No. 4521749. The device is a pump former, in which the liquid contents in the liquid cylinder are pushed out by the liquid piston pushed down by the pushing force of the nozzle body, and in the air cylinder by the air piston pushed down by the pushing force mentioned above. It is configured to push out the air. The contents extruded from each cylinder and air are mixed to form bubbles and discharged from the discharge holes of the nozzle body. Further, when the pushing-down force is released, each piston is pushed up by the elastic force of the spring that returns and moves each piston to the original position, and the internal volume of each cylinder is increased. As a result, a suction force is generated, so that the contents in the container body are sucked up inside the liquid cylinder through the liquid guide tube, and external air is sucked into the inside of the air cylinder.

Japanese Patent No. 5214418 describes a former dispenser configured to improve so-called foam breakage after discharging the contents. The former dispenser has a liquid pump and an air pump held by a cap attached to the mouth of the container, and a pressing head for driving the pumps. A through hole that penetrates the top surface of the pressing head in the plate thickness direction is formed, and a tubular inner annular peripheral wall that extends in the axial direction is formed at the edge of the through hole. A rod extending in the axial direction is arranged inside the inner annular peripheral wall. One end of the rod extends outward from the inner annular peripheral wall and is connected to a cover that is arranged above the pressing head and is slidable in the axial direction with respect to the pressing head. Further, on one end side of the rod, an annular seal portion that is in sliding contact with the inner surface of the inner annular peripheral wall is provided. At the other end of the rod, there is a disc-shaped seal that blocks the flow path that communicates between the mixing chamber and the nozzle by being pressed against the underside of the seating surface formed at the outlet side opening end of the mixing chamber. It is provided. Further, in the mixing chamber, a spring that presses the seal portion against the seat surface to close the flow path is arranged. Therefore, when the cover body is pushed down together with the pressing head, the rod is pushed down in conjunction with it, so that the seal portion is separated from the seat surface and bubbles are discharged from the nozzle. When the force that pushes down the pressing head or the cover body is released, the rod is pushed up by the elastic force of the spring, the seal portion is pressed against the seat surface, and the flow path is closed. Further, since the annular seal portion moves upward in the inner annular peripheral wall, the internal volume of the flow path from the seal portion to the tip end portion of the nozzle is increased. As a result, the bubbles remaining at the tip of the nozzle are pulled back into the above-mentioned flow path, so that the bubble breakage is improved.

In the pump dispenser described in Japanese Patent No. 4521749, the so-called back suction function of pulling the contents remaining in the discharge hole back to the container side does not particularly occur when the pushing force for pushing down the nozzle body is released. Therefore, bubbles may remain at the tip of the nozzle body, and dripping or dripping due to liquefaction of bubbles may occur. On the other hand, in the former dispenser described in Japanese Patent No. 5214418, since the back suction function is generated, the above-mentioned foam dripping and dripping due to liquefaction of foam can be suppressed. However, in order to perform the back suction function, a member such as a cover body and a rod that moves in conjunction with the cover body is required, and the number of parts, member cost, manufacturing cost, etc. increase accordingly, and the entire device There is a possibility that it will become larger.

The present invention has been made by paying attention to the above technical problems, and an object of the present invention is to provide a pump-type discharge device capable of suppressing foam dripping and dripping with a simple configuration. ..

In order to achieve the above object, the present invention has a cylinder attached to the mouth of the container in a state of being communicated with the inside of the container, and the inside of the cylinder so as to be reciprocally fitted in the axial direction of the cylinder. A flow path formed by penetrating the piston and the piston in the axial direction, one open end communicating with the piston and the other open end communicating with the space partitioned by the cylinder and the piston. Then, one end is inserted into the flow path along the central axis of the flow path, and the other end is arranged inside the space so that the other end can move relative to the cylinder in the axial direction. The held shaft-shaped member, the valve body formed by increasing the outer diameter at one end of the shaft-shaped member, and the piston moving in the direction of increasing the volume of the space to form the valve body. The valve seat portion formed inside the flow path so as to close the flow path in close contact with the valve body and the shaft-shaped member by moving the piston in a direction reducing the volume of the space. A protrusion formed inside the flow path on the side opposite to the valve seat portion with the valve body sandwiched in the axial direction so as to push, and the piston in the direction of pressing the valve seat portion against the valve body. The piston is pushed to separate the valve body from the valve seat portion, and the volume of the space is reduced, so that the contents filled in the space flow. In a pump-type discharge device that discharges from the nozzle via a path, suction from the nozzle is performed by a negative pressure accompanying an increase in the volume of the space due to the piston moving in a direction of increasing the volume of the space by the return mechanism. It is characterized in that an immovable region is set in which the shaft-shaped member that maintains the state in which the valve body and the valve seat portion are separated from each other is stopped with respect to the cylinder so as to cause the above. It is a thing.

In the present invention, in the immovable region, when the piston moves in a direction of increasing the volume of the space from the state where the volume of the space is the smallest, the piston moves relative to the shaft-shaped member. The moving length is the moving length of the valve seat portion in the axial direction when the piston moves in the direction of increasing the volume of the space from the state where the volume of the space is the smallest. It may be the length between the valve body and the portion in contact with the upper end portion.

In the present invention, the movable distance of the axial member in the axial direction may be 20% or more and 80% or less of the movable distance of the piston.

According to the present invention, the shaft causes suction from the nozzle due to the negative pressure accompanying the increase in the volume of the space due to the movement of the piston in the direction of increasing the volume of the space partitioned by the piston and the cylinder. An immovable zone is set to maintain a state in which the valve body formed at one end of the shaft-shaped member and the valve seat formed in the flow path are separated from each other when the shaped member is stopped with respect to the cylinder. There is. Therefore, in the immovable region, the space and the nozzle are in communication with each other, and the movement of the piston in that state increases the volume of the space. That is, in the process of returning and moving the piston to the original position by the return mechanism, the contents remaining in the nozzle and the flow path are sucked back into the space by the negative pressure accompanying the increase in the volume of the space described above. Therefore, after the contents are discharged, the contents are less likely to remain near the tip of the nozzle, and dripping or foaming of the contents can be suppressed. Further, since the number of parts is not particularly increased, the device as a whole can have a simple configuration, and an increase in member cost and manufacturing cost can be suppressed.

It is sectional drawing which shows an example of the pump type discharge device which concerns on embodiment of this invention. It is sectional drawing of the pump type discharge device when the nozzle body is pushed down slightly from the top dead center toward the container side. It is a partially enlarged view of the pump type discharge device when the nozzle body is pushed down slightly from the top dead center toward the container side. It is sectional drawing of the pump type discharge device when each piston is located at the bottom dead center. It is a partially enlarged view of the pump type discharge device when each piston is located at the bottom dead center. It is a partially enlarged view of the pump type discharge device when each piston is pushed up slightly toward the mouth side of the container by the elastic force of the spring. It is a partially enlarged view of the pump type discharge device in the case where each piston is pushed up by the elastic force of the spring and the valve seat portion is pressed against the valve body.

In the pump-type discharge device according to the embodiment of the present invention, the contents filled in the inside of the container are sucked up by pumping the nozzle head in a state of being attached to the mouth of the container and discharged from the nozzle. After discharging the material, the contents remaining in the nozzle are sucked back to the container side to prevent dripping from the nozzle. The above-mentioned contents are preferably liquid contents such as shampoo and face wash, and are configured to discharge the contents in a liquid state or in the form of foam.

FIG. 1 is a cross-sectional view showing an example of a pump-type discharge device according to an embodiment of the present invention. The pump-type discharge device shown in FIG. 1 is a so-called pump former 1, in which bubbles are formed by mixing the liquid contents filled inside the container 2 with air, and the bubbles are discharged. It is configured as follows. That is, the pump former 1 shown in FIG. 1 includes a cap 4 that is detachably attached to the mouth portion 3 of the container 2. The mouth portion 3 is a cylindrical opening formed on the upper end side of the body portion of the container 2, and a male screw is formed on the outer peripheral surface of the mouth portion 3. A female screw that fits the male screw is formed on the cap 4. That is, the mouth portion 3 is screwed into the cap 4.

As shown in FIG. 1, the cap 4 has an outer cylindrical portion 5 having an outer diameter larger than the outer diameter of the mouth portion 3, and an inner cylindrical portion 6 provided concentrically with the outer cylindrical portion 5 inside the outer cylindrical portion 5. And have. The inner cylindrical portion 6 has an outer diameter smaller than the inner diameter of the mouth portion 3 and has a length in the axial direction shorter than that of the outer cylindrical portion 5. The upper end portion of the outer cylindrical portion 5 and the upper end portion of the inner cylindrical portion 6 are connected by an upper surface portion 7 extending in the radial direction. That is, the outer cylindrical portion 5, the inner cylindrical portion 6, and the upper surface portion 7 are integrally formed. Further, the above-mentioned female screw is formed on the inner peripheral surface of the outer cylindrical portion 5. An opening having an inner diameter smaller than the inner diameter of the inner cylindrical portion 6 is formed in the central portion of the upper surface portion 7. A cylindrical guide stem portion 8 extending upward in FIG. 1 is erected on the peripheral edge of the opening. A nozzle body 9 for pumping the pump former 1 is slidably fitted to the guide stem portion 8 in the axial direction (vertical direction in FIG. 1).

The nozzle body 9 includes a top surface portion 10 to which a pushing force is applied as a so-called nozzle head, a nozzle 11 for discharging bubbles, and a cylindrical inner cylinder portion 12 in which a flow path P communicating with the nozzle 11 is formed. It has a cylindrical outer cylinder portion 13 having a diameter larger than that of the inner cylinder portion 12 and formed concentrically with the inner cylinder portion 12. A part of the nozzle body 9 has a tubular shape extending outward in the radial direction about the axis of the nozzle body 9, and this portion is the nozzle 11. Each of the

tubular portions

12 and 13 extends downward in FIG. 1 from the top surface portion 10 of the nozzle body 9 in the axial direction, and the length of the inner tubular portion 12 in the axial direction is set longer than that of the outer tubular portion 13. .. Further, the outer diameter of the inner cylinder portion 12 is set to be slightly smaller than the inner diameter of the guide stem portion 8, so that the inner cylinder portion 12 can be inserted into the guide stem portion 8. Further, the inner diameter of the outer cylinder portion 13 is set to be slightly larger than the outer diameter of the guide stem portion 8, so that the guide stem portion 8 can be inserted inside the guide stem portion 8. That is, by inserting the guide stem portion 8 between the inner cylinder portion 12 and the outer cylinder portion 13 in the radial direction, the nozzle body 9 is guided by the guide stem portion 8 and the

cylinder portions

12 and 13 in the axial direction. It is designed to move to. Further, there are slight gaps between the outer peripheral surface of the inner cylinder portion 12 and the inner peripheral surface of the guide stem portion 8 and between the outer peripheral surface of the guide stem portion 8 and the inner peripheral surface of the outer cylinder portion 13. It is formed, and each of these gaps serves as an air flow path. Air is introduced into the air cylinder described later through these air flow paths.

In the example shown in FIG. 1, a net holder 14 that forms a uniform foam is fitted on the inner peripheral surface of the inner cylinder portion 12. Specifically, the net holder 14 is a tubular member, and nets (not shown) are attached to both ends in the axial direction. Further, the inner diameter of the inner cylinder portion 12 is slightly larger at the portion opposite to the top surface portion 10 with the central portion sandwiched in the axial direction, and the above-mentioned net holder 14 is located at the portion where the inner diameter is larger. It is fitted. Then, as will be described later, the contents foamed by being mixed with air pass through the net holder 14, so that fine and homogeneous bubbles are formed.

The cylinder 15 is arranged inside the cap 4. As shown in FIG. 1, the cylinder 15 is fitted to the outer peripheral side of the inner cylindrical portion 6 and integrated with the cap 4, and is below the fitting portion fitted to the inner cylindrical portion 6. The inner diameter of the side part is slightly smaller. Further, a collar 16 extending outward in the radial direction is formed at the upper end portion of the cylinder 15. The outer diameter of the collar 16 is about the outer diameter of the tip of the mouth portion 3 (the outer diameter of the opening of the mouth portion 3) or slightly larger than that. Then, a sealing material 17 is sandwiched between the tip end portion (open end) of the mouth portion 3 and the lower surface of the collar 16 (the lower surface of the collar 16 in FIG. 1) in order to ensure airtightness and liquidtightness. .. The collar 16 and the sealing material 17 are sandwiched between the upper surface portion 7 of the cap 4 and the tip portion of the mouth portion 3 by attaching the cap 4 to the mouth portion 3 with a screw, and seal the mouth portion 3. It is designed to stop.

More specifically, the configuration of the cylinder 15 will be described above. The cylinder 15 shown here includes an air cylinder 18 of an air pump that pushes air into the nozzle body 9, and a liquid cylinder 19 of a liquid pump that pushes the contents into the nozzle body 9. Are integrally formed. The air cylinder 18 is a large-diameter portion of the cylinder 15 formed below the fitting portion described above in the axial direction, and air is provided inside the container 2 in a part on the upper end side of the air cylinder 18. The first intake hole 20 for taking in the air cylinder 18 is formed so as to penetrate in the plate thickness direction of the air cylinder 18. The liquid cylinder 19 is formed in a tubular shape having a diameter smaller than that of the air cylinder 18, and is formed concentrically with the air cylinder 18. Further, as shown in FIG. 1, a part of the liquid cylinder 19 is formed inside the air cylinder 18 in the radial direction. That is, the liquid cylinder 19 and the air cylinder 18 are formed so as to be slightly offset in the axial direction, and at least a part of them overlap each other in the radial direction. In the example shown here, the liquid cylinder 19 is continuously formed on the air cylinder 18. As shown in FIG. 1, the boundary portion between the

cylinders

18 and 19 is a convex curved surface portion formed by bending the bottom portion of the air cylinder 18 so as to project upward in FIG. 1, and the boundary portion thereof. Further movement (pushing) of the nozzle body 9 and each piston is prevented by contact with the collar of the liquid piston described later. This position is the stroke end, that is, bottom dead center of the nozzle body 9 and each piston when each piston is pushed toward the container 2. The example shown in FIG. 1 shows a state in which the nozzle body 9 is at top dead center.

An air piston 21 that slides in the axial direction (vertical direction in FIG. 1) while maintaining an airtight state is fitted to the inner peripheral surface of the air cylinder 18. The air pump described above is composed of the air cylinder 18 and the air piston 21. The air piston 21 has a piston head 22 that divides the inside of the air cylinder 18 into upper and lower parts in FIG. 1, and a sliding portion 23 that is integrated with the piston head 22 and comes into contact with the inner peripheral surface of the air cylinder 18. doing. Of the two interiors partitioned by the piston head 22, the interior below the piston head 22 in FIG. 1 is the air chamber 24. In the example shown in FIG. 1, the sliding portion 23 is formed in a cylindrical shape, and the sliding portion 23 is slidably contacted with the inner peripheral surface of the air cylinder 18 at two points above and below the cylindrical portion while maintaining airtightness. It is configured as follows. The sliding portion 23 reciprocates in the axial direction to open and close the first intake hole 20 described above.

At a predetermined radial position in the piston head 22 in the radial direction, a second intake hole 25 is formed so as to penetrate the piston head 22 in the plate thickness direction and introduce air into the air chamber 24. Further, in the radial direction, the air chamber 24 and the outside of the container 2 communicate with each other in the portion inside the second intake hole 25 of the piston head 22 according to the internal pressure of the air chamber 24, and the air chamber 24 and the mixture described later are mixed. A molded valve 26 that communicates with the chamber is attached.

The molded valve 26 includes a cylindrical shaft portion fitted in a recess formed in the piston head 22, and an annular outer valve portion extending outward in the radial direction from an end portion of the shaft portion exposed from the recess. It is provided with an annular inner valve portion extending inward in the radial direction from the end portion of the shaft portion exposed from the recess. The outer valve portion closes the second intake hole 25 when the internal pressure of the air chamber 24 is higher than the external pressure of the container 2, and the second intake hole 25 when the internal pressure of the air chamber 24 is lower than the external pressure of the container 2. The second intake hole 25 is covered from the inside of the air chamber 24 so as to open 25. That is, the outer valve portion constitutes an air suction valve 27 that introduces or shuts off the outside air into the air chamber 24. The inner valve portion communicates the air chamber 24 and the mixing chamber when the internal pressure is higher than the external pressure of the container 2, and connects the air chamber 24 and the mixing chamber when the internal pressure is lower than the external pressure of the container 2. It is in contact with the collar of the liquid piston, which will be described later, so as to cut off the communication state. That is, the air discharge valve 28 that supplies or pushes out the air of the air chamber 24 to the mixing chamber is configured by the inner valve portion.

Further, a cylindrical portion 29 extending to the opposite side (upper side in FIG. 1) from the container 2 is integrally formed at the central portion of the piston head 22 in the radial direction. The inner cylinder portion 12 formed in the nozzle body 9 described above is fitted to one end of the cylindrical portion 29 (the upper end in FIG. 1), and the lower end of the net holder 14 is fitted. .. In the example shown in FIG. 1, a ridge portion is formed on the outer peripheral surface of one end of the cylindrical portion 29, and a concave groove portion that fits into the ridge portion is formed on the inner peripheral surface of the inner cylinder portion 12. There is. The cylindrical portion 29 and the inner cylinder portion 12 are firmly connected by the fitting of the convex portion and the concave groove portion. The cylindrical portion 29 and the inner cylinder portion 12 may be connected by means such as screw fitting or clasp fitting.

The inner diameter of one end of the cylindrical portion 29 is formed to be slightly larger than the outer diameter of the lower end portion of the net holder 14. Further, among one end of the cylindrical portion 29, a plurality of protrusions 30 protruding inward in the radial direction are formed on the inner peripheral surface below the portion having a large inner diameter described above. The protrusion 30 defines the position of the net holder 14 in the flow path P, and when the nozzle body 9 is pushed in, it contacts one end of the shaft-shaped member described later and pushes the shaft-shaped member. Is. Further, the protrusion 30 is set to an inner diameter of about the inner diameter of the net holder 14 so that the protrusion 30 does not particularly hinder the flow of the contents in the flow path P. Then, as shown in FIG. 1, when the nozzle body 9 is at the top dead center position, a clearance is provided between the upper end portion of the valve body of the shaft-shaped member described later and the side surface of the protrusion 30 that contacts the upper end portion. C1 is set. The lower end portion of the net holder 14 is adapted to fit into the fitting portion formed by the portion having a large inner diameter and the protrusion portion 30 of one end portion of the cylindrical portion 29 described above. In this way, the air piston 21 and the nozzle body 9 are integrated, and the net holder 14 is held in the flow path P between them. Therefore, when the top surface portion 10 of the nozzle body 9 is pressed toward the container 2 side and the nozzle body 9 is pushed down, the air piston 21 moves to the container 2 side together with the nozzle body 9 and is partitioned by the air cylinder 18 and the air piston 21. The volume of the air chamber 24 or the substantial internal volume of the air chamber 24 is reduced. Then, the inside of the air chamber 24 is pressurized, and the air inside the air chamber 24 is pushed out from the air chamber 24. Further, when the air piston 21 is pushed down toward the container 2 by the clearance C1 described above, the protrusion 30 contacts the upper end of the valve body of the shaft-shaped member and pushes down the shaft-shaped member toward the container 2. It has become like.

The liquid piston 31 of the liquid pump is fitted to the other end of the cylindrical portion 29 (the lower end in FIG. 1). As shown in FIG. 1, the liquid piston 31 is formed in a tubular shape extending in the axial direction, and one end portion (upper end portion in FIG. 1) is fitted to the other end portion of the cylindrical portion 29. There is. Specifically, the other end of the cylindrical portion 29 is formed with a recess recessed in the axial direction into which one end of the liquid piston 31 fits. The inner diameter of the recess is set to such an inner diameter that one end of the liquid piston 31 fits. Further, an air flow path (not shown) is formed between these recesses and one end of the liquid piston 31. The space between the fitting portion between the other end of the cylindrical portion 29 and the liquid piston 31 in the axial direction and the net holder 14 fitted inside the cylindrical portion 29 is filled with air and liquid contents. It is a mixing chamber 32 to be mixed. One end of the air flow path described above communicates with the flow path P in the cylindrical portion 29 described above, and the other end communicates with the space partitioned by the liquid piston 31 and the air piston 21.

A collar 33 protruding outward in the radial direction is formed on the outer peripheral surface of the liquid piston 31. As described above, the collar 33 regulates the lower limit positions of the air piston 21 and the liquid piston 31. Further, as shown in FIG. 1, when the nozzle body 9 is at the top dead center, the air discharge valve 28 is in contact with the upper surface of the collar 33. The other end of the liquid piston 31 is fitted to the inner peripheral surface of the liquid cylinder 19 so as to maintain a liquidtight state and slide in the axial direction (vertical direction in FIG. 1). Therefore, the liquid pump described above is configured by the liquid cylinder 19 and the liquid piston 31, and the tubular space formed by the liquid cylinder 19 and the liquid piston 31 is the liquid chamber 34. As described above, when the top surface portion 10 of the nozzle body 9 is pressed toward the container 2 side and the nozzle body 9 is pushed down, the liquid piston 31 moves to the container 2 side together with the air piston 21, and the volume of the liquid chamber 34 described above or The substantial internal volume of the liquid chamber 34 is reduced. Then, the inside of the liquid chamber 34 is pressurized, and the liquid inside the liquid chamber 34 is pushed out from the liquid chamber 34.

Further, inside the liquid chamber 34, a return mechanism for returning and moving the nozzle body 9 and each piston to the original position when the force for pushing down the nozzle body 9 and each piston toward the container 2 side is released, and a nozzle body. A valve mechanism for communicating the liquid chamber 34 with the inside of the container 2 according to the pumping of 9 and communicating the liquid chamber 34 with the mixing chamber 32 and the flow path P is arranged. First, the return mechanism will be described. In the embodiment shown here, the return mechanism is configured to return and move the nozzle body 9 and the

pistons

21 and 31 by a coil spring (hereinafter, simply referred to as a spring) 35. There is. A spring receiving portion for fitting one end of the spring 35 is formed at the other end of the liquid piston 31 described above, and a similar spring receiving portion is provided on the inner peripheral portion of the bottom of the liquid cylinder 19. The spring 35 is arranged in a compressed state between these spring receiving portions. Therefore, an elastic force that pushes up the liquid piston 31 to the side opposite to the container 2 side (upper side in FIG. 1) is constantly acting.

Explaining the valve mechanism described above, the shaft-shaped member 36 is arranged along the central axis of the liquid cylinder 19. One end of the shaft-shaped member 36 (the upper end in FIG. 1) protrudes from one end of the liquid piston 31. A valve body 37 is integrally formed at one end of the shaft-shaped member 36. The valve body 37 is a tapered portion whose outer diameter gradually increases toward one end side of the shaft-shaped member 36. On the other hand, at one end of the liquid piston 31, an annular convex portion is formed which is convex inward in the radial direction, that is, toward the center side of the flow path P. The annular convex portion is located closer to the container 2 than the valve body 37, and its minimum inner diameter is set to engage with the tapered surface of the valve body 37 by being smaller than the outer diameter of the valve body 37. There is. Further, the upper surface of the annular convex portion (the surface of the valve body 37 facing the tapered surface) is formed in a tapered shape in which the inner diameter gradually increases on the upper side. Therefore, this annular convex portion is configured to come into contact with the valve body 37 from the lower side of FIG. 1 to close the flow path P and the liquid chamber 34 in a liquidtight state. That is, the annular convex portion is the valve seat portion 38.

The other end (lower end in FIG. 1) of the shaft-shaped member 36 opposite to the valve body 37 has a downward arrowhead shape or a triangular cross section in the example shown in FIG. The other end is inserted into the tubular locking body 39 provided at the bottom of the liquid cylinder 19, and is in contact with the inner peripheral surface of the locking body 39 and is locked in that state. It is designed to slide on the inner peripheral surface of the body 39. More specifically, the outer diameter of the lower end portion of the shaft-shaped member 36 is set to be slightly larger than the inner diameter of the inner peripheral surface of the locking body 39, and is elastically deformed so as to reduce the outer diameter. It is inserted inside the locking body 39. That is, at the other end of the shaft-shaped member 36, an elastic force is generated so that the outer peripheral surface thereof comes into contact with the inner peripheral surface of the locking body 39, and the load for moving the shaft-shaped member 36 in the axial direction is the shaft. When the shape member 36 is not particularly acting, the movement in the axial direction is prevented by its elastic force or the frictional force between the inner peripheral surface of the locking body 39 and the other end of the shaft-shaped member 36. ing. That is, the other end of the shaft-shaped member 36 is the engaging portion 40 with respect to the locking body 39.

The inner peripheral portion of one end (upper end in FIG. 1) of the locking body 39 is formed in the above-mentioned arrowhead shape or triangular cross section, and is formed in the engaging portion 40 of the shaft-shaped member 36. It is a hook portion 41 that is caught in the portion. As a result, the shaft-shaped member 36 is prevented from coming off with respect to the locking body 39, and further movement of the nozzle body 9 and the

pistons

21 and 31 is prevented. This position is the stroke end, that is, top dead center of the nozzle body 9 and the

pistons

21 and 31 when the

pistons

21 and 31 are returned to their original positions. A plurality of opening grooves 42, which serve as flow paths for the liquid contents, are formed on the lower side surface of the locking body 39 in the axial direction at regular intervals in the circumferential direction. Since the inside of the locking body 39 communicates with the inside of the container 2 as described below, the contents flow from the inside of the locking body 39 to the liquid chamber 34 outside the locking body 39 through the opening groove 42. It has become.

The bottom of the liquid cylinder 19 is provided with a check valve that opens when the contents are sucked up and filled into the liquid chamber 34 from the inside of the container 2 and closes when the contents are pushed out from the liquid chamber 34. Has been done. In the example shown here, the check valve is composed of a ball valve 43, and a tapered valve seat portion 44 having an inner diameter gradually increasing on the upper side is formed at the bottom of the liquid cylinder 19. The ball 45 is arranged so as to come into contact with the tapered surface of the valve seat portion 44 from above the valve seat portion 44 in the axial direction. Further, a tube 46 for introducing the contents filled inside the container 2 into the inside of the liquid chamber 34 is connected to the bottom of the liquid cylinder 19. The tip of the tube 46 extends to the vicinity of the bottom of the container 2 (not shown).

Next, the operation of the pump former 1 according to the present invention will be described. When the force for pushing down the nozzle body 9 does not particularly act on the nozzle body 9, the nozzle body 9 is at top dead center as shown in FIG. In the state shown in FIG. 1, the

pistons

21 and 31 are pushed upward (upward in FIG. 1) in the

cylinders

18 and 19 by the elastic force of the spring 35. Therefore, the valve seat 38 formed at one end of the liquid piston 31 is pressed against the valve body 37 of the shaft-shaped member 36, and the communication between the liquid chamber 34 and the mixing chamber 32 and the flow path P is blocked. Has been done. Further, the engaging portion 40 of the shaft-shaped member 36 is caught by the hook portion 41 of the locking body 39 and is prevented from coming off from the locking body 39. The ball 45 of the ball valve 43 is in contact with the valve seat portion 44 by the contents in the liquid chamber 34 or by its own weight, and the communication between the liquid chamber 34 and the inside of the container 2 is cut off. Further, the first intake hole 20 formed in the air cylinder 18 is closed by the sliding portion 23 of the air piston 21. Since the volume of the air chamber 24 does not change in particular because the air piston 21 does not move in the axial direction, the second intake hole 25 is maintained in a state of being covered by the air intake valve 27, and the air discharge valve 28 is also covered. Is kept in contact with the collar 33 of the liquid piston 31. That is, both the air intake valve 27 and the air discharge valve 28 are closed.

When the nozzle body 9 is slightly pushed down from the state shown in FIG. 1, the

pistons

21 and 31 are pushed down toward the container 2 by receiving the pushing force. FIG. 2 shows a state in which the nozzle body 9 is slightly pushed down toward the container 2. As shown in FIG. 2, the engaging portion 40 of the shaft-shaped member 36 is pressed against the inner peripheral surface of the locking body 39 by the above-mentioned elastic force, frictional force, or the like. Further, at that time, a force other than the elastic force and the frictional force described above does not particularly act on the shaft-shaped member 36. Therefore, in the state shown in FIG. 2, the shaft-shaped member 36 is fixed to the locking body 39, and the shaft-shaped member 36 maintains a stopped state with respect to the

cylinders

18 and 19. Further, the shaft-shaped member 36 moves relative to the liquid piston 31. In the state where the shaft-shaped member 36 and the liquid piston 31 move relative to each other in this way, the protrusion 30 formed on the inner peripheral surface of the cylindrical portion 29 by further pushing down the air piston 21 is the valve body 37 of the shaft-shaped member 36. That is, until the liquid piston 31 moves to the container 2 side by the amount of the clearance C1 described above.

Further, FIG. 3 shows a partially enlarged view of the pump former 1 when the nozzle body 9 is slightly pushed down. When the liquid piston 31 is pushed down as described above, as shown in FIG. 3, the valve seat portion 38 of the liquid piston 31 is separated from the valve body 37 of the shaft-shaped member 36. As a result, a gap is created between the shaft-shaped member 36 and the valve seat portion 38, and the liquid chamber 34 and the mixing chamber 32 communicate with each other. As the liquid piston 31 is pushed down, the spring 35 contracts and the internal volume of the liquid chamber 34 decreases, whereby the internal pressure of the liquid chamber 34 increases. Then, the ball 45 of the ball valve 43 is further pressed against the valve seat portion 44, the communication between the liquid chamber 34 and the inside of the container 2 is maintained in a blocked state, and the contents filled in the inside of the liquid chamber 34. Flows through the gap between the shaft-shaped member 36 and the valve seat 38 and is further pushed into the mixing chamber 32.

When the air piston 21 is pushed down toward the container 2, the sliding portion 23 moves to the lower side of the first intake hole 20, and the space above the piston head 22 moves to the outside of the container 2 via the first intake hole 20. Communicate. Further, the internal volume of the air chamber 24 is reduced by the amount that the

pistons

21 and 31 are pushed down. As a result, the internal pressure of the air chamber 24 increases, so that the air suction valve 27 is pressed against the second intake hole 25. On the other hand, the air discharge valve 28 is separated from the collar 33 of the liquid piston 31. As a result, the air inside the air chamber 24 flows out from the air discharge valve 28, and also flows through the air flow path formed in the fitting portion between the cylindrical portion 29 and the liquid piston 31 and is pushed out to the mixing chamber 32. ..

By the way, the flow velocity of the contents in the liquid chamber 34 is increased due to the narrow gap between the shaft-shaped portion of the shaft-shaped member 36 and the valve seat portion 38 and the gap between the cylindrical portion 29 and the valve body 37. It is supplied to the mixing chamber 32 in a state. The air extruded from the air chamber 24 is supplied to the mixing chamber 32 in a state where the flow velocity is increased due to the narrow air flow path described above. Therefore, in the mixing chamber 32, air and liquid contents are agitated to form bubbles.

When the nozzle body 9 is further pushed down from the state shown in FIGS. 2 and 3, the protrusion 30 comes into contact with the valve body 37 of the shaft-shaped member 36. Then, when the nozzle body 9 is further pushed down while the protrusion 30 is in contact with the valve body 37, the shaft-shaped member 36 is pushed down toward the container 2 by the

pistons

21 and 31. That is, the shaft-shaped member 36 moves integrally with the

pistons

21 and 31. In this state, the shaft-shaped member 36 moves relative to each of the

cylinders

18 and 19. The engaging portion 40 of the shaft-shaped member 36 slides toward the container 2 in a state of being pressed against the inner peripheral surface of the locking body 39. In this way, the internal volume of the air chamber 24 is further reduced, and the air filled in the air chamber 24 is pushed out from the air chamber 24 to the mixing chamber 32. Similarly, the contents inside the liquid chamber 34 are extruded from the liquid chamber 34 into the mixing chamber 32. In the mixing chamber 32, as described above, the air and the contents are agitated to form bubbles, and the bubbles are pushed out from the air chamber 24 and the liquid chamber 34 by the air and the contents pushed out from the mixing chamber 32 to the net holder 14. Pushed towards. Then, the above-mentioned bubbles pass through the net holder 14 to be finely homogenized, and in that state, flow through the flow path P and are discharged from the nozzle 11 to the outside.

When the

pistons

21 and 31 move to the container 2 side as described above and the collar 33 of the liquid piston 31 comes into contact with the boundary portion between the air cylinder 18 and the liquid cylinder 19, it of the nozzle body 9 and the

pistons

21 and 31. The above movement (pushing) is prevented. This position is the stroke end on the bottom dead center side of the nozzle body 9 and the

pistons

21 and 31, and this state is shown in FIG. Then, when the contents are discharged and the pressure inside the air chamber 24 and the liquid chamber 34 drops and becomes in equilibrium with the external pressure, the discharge of the contents stops.

5A to 5C are diagrams schematically showing the process of the nozzle body 9 and the

pistons

21 and 31 returning from the bottom dead center to the top dead center, and FIG. 5A shows the process in which the

pistons

21 and 31 return to the top dead center. FIG. 5B is a partially enlarged view showing a state in which the

pistons

21 and 31 are slightly pushed up toward the mouth 3 side of the container 2 by the elastic force of the spring 35. FIG. 5C is a partially enlarged view showing a state in which the

pistons

21 and 31 are pushed up by the elastic force of the spring 35 and the valve seat portion 38 is pressed against the valve body 37. When the

pistons

21 and 31 are located at the bottom dead center, as shown in FIG. 5A, the valve body 37 of the shaft-shaped member 36 and the valve seat 38 of the liquid piston 31 are separated from each other.

When the pushing force on the nozzle body 9 is released from the state shown in FIG. 5A, the nozzle body 9 and the

pistons

21 and 31 start returning to the mouth 3 side of the container 2 due to the elastic force of the spring 35. Further, at the time when the

pistons

21 and 31 start to return and move due to the elastic force of the spring 35, no force other than the above elastic force and frictional force is particularly acting on the shaft-shaped member 36. Therefore, the shaft-shaped member 36 is held and fixed to the locking body 39, that is, the

cylinders

18 and 19 are stopped. The shaft-shaped member 36 moves relative to the liquid piston 31. Therefore, as shown in FIG. 5B, the valve seat portion 38 formed at one end of the liquid piston 31 approaches the valve body 37 formed at one end of the shaft-shaped member 36.

When the liquid piston 31 returns to the mouth 3 side of the container 2 in this way, the internal volume of the liquid chamber 34 increases, so that the pressure inside the liquid chamber 34 becomes a negative pressure lower than the atmospheric pressure. In the state shown in FIG. 5B, since the valve seat 38 of the liquid piston 31 has not yet come into contact with the valve body 37 of the shaft member 36, a gap is generated between the shaft member 36 and the valve seat 38. ing. Therefore, the liquid chamber 34 communicates with the mixing chamber 32 and the flow path P through the above gap, and also communicates with the nozzle 11. Therefore, at least a part of the foamy contents remaining in the flow path P from the nozzle 11 to the liquid chamber 34 is sucked back into the liquid chamber 34 by the suction force caused by the negative pressure described above. The operating state of sucking back the foamy contents in the flow path P into the liquid chamber 34 is when the nozzle body 9 and the

pistons

21 and 31 are returned and moved by the elastic force of the spring 35. It continues until the communication state between the liquid chamber 34 and the flow path P is cut off. Specifically, it occurs until the upper end portion of the valve seat portion 38 and the portion of the tapered surface of the valve body 37 that contacts the upper end portion come into contact with each other in the axial direction. Further, the ball 45 is separated from the valve seat portion 44 by the above negative pressure, and the liquid content filled in the inside of the container 2 is sucked up into the inside of the liquid chamber 34 through the tube 46. Since the foamy content is lighter than the liquid content, it is easily sucked back into the liquid chamber 34 by the above-mentioned negative pressure, and therefore, the foamy content sucked back into the liquid chamber 34. The amount of material is larger than that of the liquid content. When the liquid piston 31 returns and moves from the bottom dead center to the top dead center, the upper end portion of the valve seat portion 38 and the upper end portion of the tapered surface of the valve body 37 are in contact with each other in the axial direction described above. The clearance C2 between the parts and the moving portion corresponds to the immovable region in the embodiment of the present invention and the moving length of the piston. Further, the clearance C2 has the same length as the clearance C1 described above.

Further, when the air piston 21 returns to the mouth 3 side of the container 2 due to the elastic force of the spring 35, the internal volume of the air chamber 24 increases accordingly, so that the pressure inside the air chamber 24 decreases. As a result, the internal pressure of the air chamber 24 becomes a negative pressure lower than the atmospheric pressure. The negative pressure causes the air discharge valve 28 to be pressed against the collar 33 of the liquid piston 31. On the other hand, the air suction valve 27 is displaced toward the air chamber 24 by negative pressure and is separated from the second intake hole 25. Therefore, due to the above negative pressure, the air outside the container 2 is allowed to flow through the air flow path between the guide stem portion 8 and the outer cylinder portion 13 and between the guide stem portion 8 and the inner cylinder portion 12. It reaches the space above the piston head 22 via such means, and is sucked into the air chamber 24 from that space through the second intake hole 25.

When the nozzle body 9 and the

pistons

21 and 31 are further returned and moved to the mouth portion 3 side of the container 2 by the elastic force of the spring 35, specifically, the same length as the clearance C2 described above, the mouth portion 3 side of the container 2 When the

pistons

21 and 31 are pushed up, the valve seat portion 38 of the liquid piston 31 comes into contact with the valve body 37 of the shaft-shaped member 36. This state is shown in FIG. 5C. In the state shown in FIG. 5C, since the communication between the liquid chamber 34 and the flow path P is cut off, the suction from the nozzle 11 side due to the above-mentioned negative pressure is stopped. On the other hand, the communication state between the liquid chamber 34 and the inside of the container 2 via the ball valve 43 is not blocked. Therefore, the liquid contents filled in the inside of the container 2 by the negative pressure are sucked up into the inside of the liquid chamber 34 through the tube 46. Further, since the communication state between the air chamber 24 and the outside is not cut off, the internal volume continues to increase due to the return movement of the air piston 21, and the negative pressure due to the increase in the internal volume causes the inside of the air chamber 24 to increase. Air is sucked.

When the

pistons

21 and 31 are further returned and moved, the shaft-shaped member 36 and the liquid piston 31 are integrated with each other in a state where the valve seat portion 38 of the liquid piston 31 is pressed against the valve body 37 of the shaft-shaped member 36. It moves further upward at 5C. As a result, the internal volume of the liquid chamber 34 is further increased, and the contents filled inside the container 2 are sucked up into the inside of the liquid chamber 34 via the ball valve 43 by the negative pressure accompanying the increase in the internal volume. .. In the air chamber 24, as described above, the communication state between the air chamber 24 and the outside is not cut off, so that the internal volume continues to increase with the return movement of the air piston 21, and the negative due to the increase in the internal volume. Air is sucked into the air chamber 24 by the pressure.

Further, when the

pistons

21 and 31 are returned to the mouth portion 3 side of the container 2 by the elastic force of the spring 35, the engaging portion 40 of the shaft-shaped member 36 is finally caught by the hook portion 41, and the nozzle body 9 and The return movement of the

pistons

21 and 31 is stopped. Then, when the pressure inside the liquid chamber 34 and the pressure inside the container 2 are in equilibrium, the suction of the contents filled inside the container 2 is stopped. Similarly, when the pressure inside the air chamber 24 and the atmospheric pressure are in equilibrium, the suction of air stops. Further, the sliding portion 23 closes the first intake hole 20. As a result, the communication between the inside and the outside of the container 2 is cut off, and the invasion of foreign matter into the inside of the container 2 is prevented or suppressed. That is, the pump former 1 is in the state shown in FIG.

In the pump former 1 having the above-described configuration, the valve formed on the shaft-shaped member 36 when the nozzle body 9 and the

pistons

21 and 31 start the return movement from the bottom dead center to the top dead center. An immovable region in which the shaft-shaped member 36 is stopped is set for each of the

cylinders

18 and 19 so that the body 37 and the valve seat portion 38 formed on the liquid piston 31 are maintained in a separated state. That is, the state of communication between the liquid chamber 34 and the flow path P while the liquid piston 31 is moving by a predetermined length after starting the return movement or until a predetermined time elapses. Is to be maintained. Therefore, in the above-mentioned immovable region, the liquid piston 31 returns and moves in a state where the flow path P and the liquid chamber 34 communicate with each other, and a negative pressure is generated as the internal volume of the liquid chamber 34 increases. As a result, at least a part of the foamy contents remaining in the flow path P from the liquid chamber 34 to the nozzle 11 is sucked back into the liquid chamber 34 by the above negative pressure. As a result, the contents are less likely to remain in the flow path P, the tip of the nozzle 11, and the like. Then, it is possible to prevent or suppress foam dripping and dripping due to liquefaction of bubbles. Further, since the above-mentioned structure for suppressing foam dripping and dripping is not particularly provided, the device as a whole can have a simple structure, and the cost related to the member and the manufacturing can be reduced.

In the pump former 1 according to the embodiment of the present invention, by changing the size of the clearance C2 described above, that is, the movable distance of the shaft-shaped member 36 with respect to the movable distance of the

pistons

21 and 31 in the axial direction, respectively. The so-called back suction function of sucking the contents remaining in the flow path P back to the liquid chamber 34 in the process of returning the

pistons

21 and 31 to their original positions can be changed. In the experimental example described below, pump formers 1 in which the above-mentioned clearance C2 was increased by 0.5 mm from 1 mm to 15 mm were prepared, and the back suction function of the pump former 1 was evaluated. .. That is, in Experimental Example 1, a pump former 1 having a clearance C2 set to 1 mm was created, and in Experimental Example 29, a pump former 1 having a clearance C2 set to 15 mm was created, and their backsuction functions were evaluated. went. The evaluation results of each back suction function of Experimental Example 1 to Experimental Example 29 are summarized in Table 1 below. The total stroke length of each

piston

21 and 31 is set to 15 mm.

Further, in Table 1, the movable distance of the shaft-shaped member 36 with respect to the movable distance of each of the

pistons

21 and 31 in the axial direction is shown as a percentage. Further, the number of times of emptying is such that the contents filled in the container 2 are filled in the liquid chamber 34 from the state in which the contents are not filled in the liquid chamber 34 of the pump former 1 attached to the container 2. It is the number of times that the nozzle body 9 is pumped until the contents are discharged from the nozzle 11. The discharge amount is the amount of foamy contents discharged from the nozzle 11. It should be noted that each experiment on the number of empty spaces and the discharge amount was performed a plurality of times, and the arithmetic mean of the number of empty spaces and the discharge amount is shown in Table 1, respectively. Then, the foam dripping from the nozzle 11 was evaluated. In the table, the symbol "○" indicates that the foam-like contents are sucked back from the tip of the nozzle 11 toward the inside of the flow path P, and the foam dripping from the tip of the nozzle 11 is prevented or suppressed. It shows that there is. In the symbol of "x", the foamy contents are not sucked back from the tip of the nozzle 11 toward the inside of the flow path P, and therefore, the foamy contents are not sucked back to the tip of the nozzle 11 or its vicinity. It shows that it remains and it is difficult to suppress foam dripping. The "△" symbol indicates that the evaluation result for the bubble dripping does not correspond to either "○" or "×". For example, although the foam-like contents are sucked back from the tip of the nozzle 11 toward the inside of the flow path P, the degree of the foam-like contents is small, so that the foam drips due to the temperature, the type of the contents, the vibration, or the like. It shows that it may occur. In Experimental Examples 1 to 29 in the table, the pump former 1 is configured in the same manner except that the clearance C2 described above is changed, and the number of times of emptying, the discharge amount of the contents, and bubbles from the nozzle 11 described above are described. Multiple people subjectively evaluated who and so on.

(Comprehensive evaluation)
In the pump former 1 of Experimental Example 1 to Experimental Example 3, as shown in Table 1, the discharge amount was larger than that of Experimental Example 4 to Experimental Example 29, but the evaluation result of foam dripping was “x”. .. This is due to the short clearance C2, which shortens the time that the valve body 37 and the valve seat 38 are separated from each other in the process of the return movement described above, and therefore remains inside the flow path P. It is presumed that this is because it became difficult to suck the contents back into the liquid chamber 34.

In Experimental Example 4, the clearance C2 is increased as compared with Experimental Example 1 to Experimental Example 3 described above, so that the valve body 37 and the valve seat 38 are separated from each other for a longer time in the process of return movement. Therefore, it is inferred that the evaluation result of the bubble dripping became "△". That is, in Experimental Example 4, it can be said that the back suction function has occurred. On the other hand, since the foamy contents remaining inside the flow path P are sucked back into the liquid chamber 34, the amount of the liquid contents sucked up from the inside of the container 2 into the liquid chamber 34 increases. It will decrease. It is presumed that this is a factor that causes the discharge amount of the pump former 1 of Experimental Example 4 to decrease and the number of empty spaces to increase as compared with the discharge amounts of Experimental Examples 1 to 3.

In Experimental Example 5 to Experimental Example 23, the clearance C2 was increased as compared with Experimental Example 4, so it is presumed that the evaluation result of the bubble dripping was “○”. That is, it can be said that the back suction function is satisfactorily generated when the movable distance of the shaft-shaped member 36 exceeds 20% with respect to the movable distance of the

pistons

21 and 31 in the axial direction. Further, in each of the pump formers 1 of Experimental Example 5 to Experimental Example 23, it was found that the discharge amount decreased and the number of empty spaces increased as the clearance C2 increased. This is because, as described above, as the clearance C2 increases, the amount of the contents sucked back from the nozzle 11 into the liquid chamber 34 increases, so that the liquid sucked up from the inside of the container 2 into the liquid chamber 34. It is presumed that this is because the amount of contents is reduced. In Experimental Example 5 to Experimental Example 23, the number of empty spaces may be the same, but this is considered to be due to a manufacturing error, and the overall tendency is that the number of empty spaces decreases as the clearance C2 increases. Was recognized. In addition, the number of times of emptying in Experimental Example 5 to Experimental Example 23 is 3 to 5 times, which is an index of the number of pumping times (3 times) as the number of pumping times that does not give discomfort or stress to the user. It is within the range of 5 times).

Then, in Experimental Example 24 to Experimental Example 29, it is presumed that the clearance C2 was sufficiently large, so that the backsuction function was further improved as compared with each of the above-mentioned Experimental Examples, and the evaluation result of foam dripping was "○". To. On the other hand, since the amount of foamy contents sucked back into the liquid chamber 34 is larger than that of Experimental Example 15 to Experimental Example 23, the discharge amount is further reduced and the number of empty spaces is further increased. It is presumed that it was done. In particular, a remarkable increase in the number of empty spaces is observed, and it takes a long time for the user to discharge and use the contents, which may cause discomfort and stress. Therefore, it is preferable to set the movable distance of the shaft-shaped member 36 in the axial direction, that is, the stroke amount to 20% or more and 80% or less of the total stroke amount of each of the

pistons

21 and 31.

The present invention is not limited to the above-described embodiment, and the pump-type discharge device according to the embodiment of the present invention whisks by mixing the liquid content filled inside the container 2 with air. Instead of the so-called pump former 1 that discharges the liquid, the pump dispenser may be configured to discharge the liquid filled in the container 2 as it is. In short, when the piston is returned and moved, the contents accumulated in the vicinity of the nozzle may be sucked back into the space partitioned by the piston and the cylinder.

Claims

A cylinder attached to the mouth of the container in a state of communicating with the inside of the container, a piston fitted inside the cylinder so as to be reciprocally reciprocating in the axial direction of the cylinder, and a piston penetrating the piston in the axial direction. A flow path in which one open end communicates with the nozzle and the other open end communicates with the space partitioned by the cylinder and the piston, and the center of the flow path inside the flow path. A shaft-shaped member in which one end is inserted along the axis and the other end is arranged inside the space so as to be movable relative to the cylinder in the axial direction, and the shaft-shaped member. The valve body formed by increasing the outer diameter at one end thereof, and the flow path so that the piston moves in the direction of increasing the volume of the space so as to be in close contact with the valve body and close the flow path. The valve seat portion formed inside the valve seat and the piston move in the direction of reducing the volume of the space to contact the valve body and push the shaft-shaped member so as to sandwich the valve body in the axial direction. The piston is provided with a protrusion formed inside the flow path on the side opposite to the valve seat portion and a return mechanism for pressing the piston in the direction of pressing the valve seat portion against the valve body. In the pump-type discharge device, the contents filled in the space are discharged from the nozzle through the flow path by separating the valve body from the valve seat portion and reducing the volume of the space. ,
The shaft-shaped member is attached to the cylinder so that suction from the nozzle is generated by the negative pressure accompanying the increase in the volume of the space due to the piston moving in the direction of increasing the volume of the space by the return mechanism. A pump-type discharge device characterized in that an immovable region is set to maintain a state in which the valve body and the valve seat portion are separated from each other while stopped.
In the pump type discharge device according to claim 1,
The immovable region is the moving length of the piston in which the piston moves relative to the shaft-shaped member when the piston moves in a direction of increasing the volume of the space from the state where the volume of the space is the smallest. And
The moving length is the upper end portion of the valve seat portion and the upper end portion of the valve body in the axial direction when the piston moves in the direction of increasing the volume of the space from the state where the volume of the space is the smallest. A pump-type discharge device characterized by having a length between the portion in contact with the pump.
In the pump type discharge device according to claim 1 or 2.
A pump-type discharge device characterized in that the movable distance of the axial member in the axial direction is 20% or more and 80% or less of the movable distance of the piston.