TW202108472A - Pump-type ejection device - Google Patents

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 reduces the internal volume by pressing the nozzle body, and discharges the liquid pressed from the cylinder body from the discharge hole of the nozzle body.

An example of such a device is described in Patent Document 1. The device is a pump-type foam generator, which is composed of a liquid piston that is pressed by a nozzle body to press out the contents of the liquid in a liquid cylinder, and the air is pressed by the pressing force. The piston presses out the air in the air cylinder. The contents pressed from each cylinder and air are mixed into a foam and discharged from the discharge hole of the nozzle body. In addition, if the above-mentioned pressing force is released, the internal volume of each cylinder is increased by the elastic force of the spring that returns the pistons to their original positions and pushes the pistons upward. By this, the suction force is generated, so that the content in the container body is sucked up into the inside of the liquid cylinder through the catheter, and the outside air is sucked in the inside of the air cylinder.

The foamer dispenser described in Patent Document 2 is configured to improve the so-called defoaming property after the contents are discharged. The foam ejector has a liquid pump and an air pump held by a cap installed at the mouth of the container, and a pressing head for driving the pumps. The top surface of the pressing head is formed with a through hole penetrating the top surface in the plate thickness direction, and a cylindrical inner annular peripheral wall extending 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 portion extends to the outside of the inner annular peripheral wall and is connected to a cover body which is arranged on the upper side of the pressing head and is configured to be slidable in the axial direction with respect to the pressing head. In addition, an annular sealing portion slidingly contacted with the inner surface of the inner annular peripheral wall is provided on one end side of the rod portion. A disk-shaped seal is provided at the other end of the rod, and the disk-shaped seal is pressed against the lower side of the seat surface formed at the outlet side of the mixing chamber to communicate with the mixing chamber. The flow path between the chamber and the nozzle is cut off. In addition, a spring is arranged in the mixing chamber for pressing the sealing portion against the seat surface to close the aforementioned flow path. Therefore, if the cover body is pressed together with the pressing head, the rod is pressed in conjunction with the pressing head, so that the sealing part is separated from the seat surface and foam is discharged from the nozzle. If the force of pressing the pressing head and the cover body is released, the rod is pushed up by the elastic force of the spring, and the sealing part is pressed against the seat surface and the flow path is closed. In addition, since the annular seal portion is moved upward in the inner annular peripheral wall, the internal volume of the flow path from the seal portion to the tip of the nozzle is increased. As a result, the foam remaining at the tip of the nozzle is pulled back into the above-mentioned flow path, thereby improving the defoaming property. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4521749 [Patent Document 2] Japanese Patent No. 5214418

[The problem to be solved by the invention]

The pump dispenser described in Patent Document 1 mentioned above does not have the so-called back suction function of pulling back the contents remaining in the discharge hole to the container side when the pressing force of the nozzle body is released. Foam will remain at the tip of the nozzle body, which may cause foam downflow and liquid downflow caused by foam liquefaction. On the other hand, the foam dispenser described in Patent Document 2 has a suck-back function and can suppress the above-mentioned foam sag and liquid sag caused by foam liquefaction. However, in order to perform the suck-back function, members such as the cover and the rod that move in conjunction with the cover become necessary. This increases the number of parts, the cost of components, and the manufacturing cost. In addition, it is possible to make the device as a whole Become large.

The present invention was developed focusing on the above-mentioned technical problems, and its purpose is to provide a pump-type discharge device that can suppress foam and liquid sags with a simple structure. [Technical means to solve the problem]

In order to achieve the above object, the pump type discharge device of the present invention is provided with a cylinder, a piston, a flow path, a shaft member, a valve body, a valve seat portion, a protrusion, and a reset mechanism. It is attached to the mouth of the container in a communicating state, the piston is fitted to the inside of the cylinder so as to reciprocate in the axial direction of the cylinder, and the flow path is formed to penetrate the piston in the axial direction. One open end is connected to the nozzle, and the other open end is connected to the space partitioned by the cylinder and the piston. One end of the shaft-shaped member is inserted into the flow path along the central axis of the flow path. Inside, the other end is arranged inside the space and is held so as to be relatively movable in the axial direction with respect to the cylinder. The valve body is formed by increasing the outer diameter at the one end of the shaft-shaped member The valve seat portion is formed in the inside of the flow path, and the piston is moved in a direction to increase the volume of the space so that it is in close contact with the valve body to close the flow path, and the protruding portion, It is formed in the inside of the flow path on the opposite side of the valve seat portion with the valve body interposed in the axial direction, and the piston moves in the direction to reduce the volume of the space so that it comes into contact with the valve body While pushing the shaft-shaped member, the resetting mechanism presses the piston in the direction of pressing the valve seat part against the valve body; by pressing the piston, the valve body separates from the valve seat part and makes the space The volume is reduced, and the content filled in the space is discharged from the nozzle through the flow path, characterized in that: It is provided with a stationary area where the shaft-shaped member is stopped relative to the cylinder to maintain the valve body and the valve seat part. In the stationary area, the piston is moved toward the space by the reset mechanism. The negative pressure accompanying the increase in the volume of the space generated by the movement in the direction of the increase in the volume of the space causes the suction from the nozzle to be generated.

In the present invention, when the immovable region moves the piston from a state where the volume of the space is the smallest in a direction in which the volume of the space is increased, the piston moves relative to the shaft-shaped member. The moving length of the piston, The length of the movement refers to the case where the piston is moved from the state in which the volume of the space is the smallest in the direction in which the volume of the space is increased. The upper end of the valve seat and the valve body in the axial direction The length between the parts in contact with the aforementioned upper end.

In the present invention, the movable distance of the shaft-shaped member in the axial direction may be 20% or more and 80% or less of the movable distance of the piston. [Effects of Invention]

According to the present invention, a non-moving area is set. In the non-moving area, the shaft-shaped member is stopped with respect to the cylinder, and the valve body formed at one end of the shaft-shaped member is kept separated from the valve seat portion formed in the flow path. In the stationary area, the suction from the nozzle is generated by the negative pressure generated by the movement of the piston in the direction that increases the volume of the space divided by the piston and the cylinder, which is accompanied by the increase in the volume of the space. Therefore, in the stationary area, the aforementioned space communicates with the nozzle, and the piston is moved in this state, thereby increasing the volume of the aforementioned space. In other words, in the process of resetting and moving the piston to its original position by the reset mechanism, the contents remaining in the nozzle and flow path are sucked back into the space by the negative pressure accompanying the increase in the volume of the space. Therefore, after the contents are discharged, it becomes difficult to leave the contents near the tip of the nozzle, and it is possible to suppress the liquid sag, foam sag, etc. of the contents. In addition, because there is no need to increase the number of parts, the entire device can be made into a simple structure, and the increase in component costs and manufacturing costs can be suppressed.

The pump-type discharge device of the embodiment of the present invention is configured to suck up the contents filled in the container by pumping the nozzle head in the state of being attached to the mouth of the container and discharge it from the nozzle. After the content is discharged, the content remaining in the nozzle is sucked back to the container side to suppress the liquid from the nozzle from flowing down. The above-mentioned content is preferably a liquid content such as a shampoo, a facial cleanser, etc., and it is configured to keep the content in a liquid state or form it into a foamed state and spit it out.

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 type foam generator 1, which is configured to form foam by mixing a liquid content filled in the container 2 with air, and discharge the foam. That is, the pump-type foam generator 1 shown in FIG. 1 includes a cover 4 that is detachably attached to the mouth 3 of the container 2. The mouth 3 is a cylindrical opening formed on the upper end side of the body of the container 2, and a male screw is formed on the outer peripheral surface of the mouth 3. A female screw fitted with the male screw is formed on the cover 4. That is, the mouth 3 is screwed to the cover 4.

The cover 4 is provided with an outer cylindrical portion 5 whose outer diameter is larger than the outer diameter of the mouth portion 3 as shown in FIG. 1, and an outer cylindrical portion 5 provided on the inner side of the outer cylindrical portion 5 concentric with the outer cylindrical portion 5. The inner cylinder part 6 on the circle. The inner cylindrical portion 6 is set so that the outer diameter is smaller than the inner diameter of the mouth 3 and the length in the axial direction is shorter than the outer cylindrical portion 5. The upper end of the outer cylindrical portion 5 and the upper end of the inner cylindrical portion 6 are connected by an upper surface 7 extending in the radial direction. That is, the outer cylindrical portion 5, the inner cylindrical portion 6 and the upper surface 7 are formed integrally. In addition, the above-mentioned female screw is formed on the inner peripheral surface of the outer cylindrical portion 5. An opening with an inner diameter smaller than the inner diameter of the inner cylindrical portion 6 is formed in the center of the upper surface 7. A cylindrical guide stem portion 8 extending upward in FIG. 1 is erected on the periphery of the opening. In the guide rod portion 8, the nozzle body 9 for pumping the pump-type foam generator 1 is slidably fitted in the axial direction (the vertical direction in FIG. 1).

The nozzle body 9 is a so-called nozzle head and has: a top surface 10 to which a pressing force is applied, a nozzle 11 for discharging foam, a cylindrical inner tube portion 12 formed with a flow path P communicating with the nozzle 11, and a Hina The cylindrical portion 12 has a larger diameter and is formed in a cylindrical outer cylindrical portion 13 on a circle concentric with the inner cylindrical portion 12. A part of the nozzle body 9 has a cylindrical shape extending outward in the radial direction centered on the axis of the nozzle body 9, and this part becomes the nozzle 11. Each of the cylindrical portions 12 and 13 extends from the top surface 10 of the nozzle body 9 downward in FIG. 1 in the axial direction, and the length of the inner cylindrical portion 12 in the axial direction is set to be longer than that of the outer cylindrical portion 13. In addition, the outer diameter of the inner tube portion 12 is set to be slightly smaller than the inner diameter of the guide rod portion 8, so that it can be inserted into the guide rod portion 8. In addition, the inner diameter of the outer cylinder portion 13 is set to be slightly larger than the outer diameter of the guide rod portion 8 so that the guide rod portion 8 can be inserted inside. In other words, by inserting the guide rod portion 8 between the inner cylindrical portion 12 and the outer cylindrical portion 13 in the radial direction, the nozzle body 9 is guided by the guide rod portion 8 and the respective cylindrical portions 12, 13 in the axial direction mobile. In addition, a slight gap is formed between the outer peripheral surface of the inner cylinder portion 12 and the inner peripheral surface of the guide rod portion 8, and between the outer peripheral surface of the guide rod portion 8 and the inner peripheral surface of the outer cylinder portion 13. The gaps respectively become air flow paths. 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 for forming a homogeneous foam is fitted into the inner peripheral surface of the inner cylinder portion 12. Specifically, the net holder 14 is a cylindrical member, and a net body not shown is attached to each of both ends in the axial direction. In addition, the inner diameter of the inner cylinder portion 12 is slightly larger in the portion opposite to the top surface portion 10 across the central portion in the axial direction, and the net holder 14 is fitted to the portion where the inner diameter is larger. And, as described later, the content foamed by being mixed with air is formed into a fine and homogeneous foam by passing through the net holder 14.

The cylinder 15 is arranged inside the cover 4. As shown in Fig. 1, the cylinder 15 is fitted on the outer peripheral side of the inner cylindrical portion 6 to be integrated with the cover 4, and the lower part of the fitting portion is fitted to the inner cylindrical portion 6 The inner diameter becomes slightly smaller. In addition, a flange 16 extending outward in the radial direction is formed at the upper end of the cylinder 15. The outer diameter of the flange 16 is the same as or slightly larger than the outer diameter of the front end of the mouth 3 (the outer diameter of the opening of the mouth 3). Moreover, between the front end (open end) of the mouth 3 and the lower surface of the flange 16 (the lower surface of the flange 16 in FIG. 1), a sealing material 17 is sandwiched in order to ensure air tightness and liquid tightness. . By attaching the cover 4 to the mouth 3 with threads, the flange 16 and the sealing material 17 are sandwiched between the upper surface 7 of the cover 4 and the front end of the mouth 3 to close the mouth 3.

The structure of the cylinder 15 will be described in more detail. The cylinder 15 shown here is the air cylinder 18 of the air pump that pushes air out toward the nozzle body 9 and the contents are pushed out toward the nozzle body 9. The liquid cylinder 19 of the liquid pump is formed integrally. The empty cylinder block 18 is a large-diameter part formed on the lower side of the above-mentioned fitting part in the axial direction of the cylinder block 15 and is a part of the upper end side of the air cylinder block 18 for sucking air into the interior of the container 2 The first air intake hole 20 is formed to penetrate through the thickness direction of the air cylinder 18. The liquid cylinder 19 is formed in a cylindrical shape with a smaller diameter than the air cylinder 18 and is formed on a circle concentric with the air cylinder 18. In addition, as shown in FIG. 1, a part of the liquid cylinder 19 is formed inside the air cylinder 18 in the radial direction. In other words, the liquid cylinder 19 and the air cylinder 18 are formed to be slightly offset in the axial direction, and at least a part of them overlaps with each other in the radial direction. In the example shown here, the liquid cylinder 19 is formed to be continuous with the air cylinder 18. The boundary part of the cylinders 18 and 19, as shown in Fig. 1, is a convex curved part formed by bending the bottom of the air cylinder 18 so as to protrude upward in Fig. 1. By making the boundary part The flange of the liquid piston described later is in contact with each other, and further movement (pushing) of the nozzle body 9 and each piston is prevented. This position is the end of the stroke of the nozzle body 9 and the pistons, that is, the bottom dead center, when the pistons are pushed toward the container 2 side. In the example shown in FIG. 1, it is shown that the nozzle body 9 is at the top dead center.

An air piston 21 is fitted into the inner peripheral surface of the above-mentioned air cylinder 18, and the air piston 21 slides in the axial direction (the vertical direction in FIG. 1) while maintaining an airtight state. The air cylinder 18 and the air piston 21 constitute the above-mentioned air pump. The air piston 21 has a piston head 22 that divides the interior of the air cylinder 18 into the upper and lower sides of FIG. 1, and a sliding part 23 that is integrated with the piston head 22 and is in contact with the inner peripheral surface of the air cylinder 18. Among the two interiors partitioned by the piston head 22, the interior below the piston head 22 in FIG. 1 becomes an air chamber 24. The sliding portion 23, in the example shown in FIG. 1, is formed in a cylindrical shape, and is configured to be in slidable contact with the inner peripheral surface of the air cylinder 18 at the upper and lower positions of the cylindrical portion. . Then, the sliding portion 23 reciprocates in the axial direction to open and close the above-mentioned first suction hole 20.

A second suction hole 25 is formed at a predetermined radial position of the piston head 22 in the radial direction. The second suction hole 25 penetrates the piston head 22 in the plate thickness direction and is used to introduce air into the air chamber 24. In addition, in the radial direction, a forming valve 26 is installed in the piston head 22 on the inner side of the second suction hole 25. The forming valve 26 connects the air chamber 24 to the outside of the container 2 in response to the internal pressure of the air chamber 24. The air chamber 24 communicates with the mixing chamber described later.

The above-mentioned forming valve 26 includes: a cylindrical shaft portion inserted into a recess formed in the piston head 22, an annular outer valve portion extending radially outward from the end of the shaft portion exposed from the recess, and A ring-shaped inner valve portion in which the end of the shaft portion where the recessed portion is exposed extends radially inward. The outer valve part covers the second suction hole 25 from the inside of the air chamber 24. When the internal pressure of the air chamber 24 is higher than the pressure outside the container 2, the second suction hole 25 is closed and the air When the internal pressure of the chamber 24 is lower than the pressure outside the container 2, the second suction hole 25 is opened. In other words, the outer valve portion constitutes the air suction valve 27 that introduces or blocks external air into the air chamber 24. The inner valve part connects the air chamber 24 with the mixing chamber when the internal pressure is higher than the pressure outside the container 2, and when the internal pressure is lower than the pressure outside the container 2, it is The air chamber 24 is in contact with the flange of the liquid piston described later in such a manner that the communication state between the air chamber 24 and the mixing chamber is blocked. In other words, the inner valve portion constitutes an air discharge valve 28 for supplying air from the air chamber 24 to the mixing chamber or for squeezing the air out.

In addition, in the center portion of the piston head 22 in the radial direction, a cylindrical portion 29 extending toward the side opposite to the container 2 (upper side in FIG. 1) is integrally formed. At one end of the cylindrical portion 29 (upper end in FIG. 1 ), the inner cylindrical portion 12 of the nozzle body 9 is fitted and formed, 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 groove portion to be fitted with the ridge portion is formed on the inner peripheral surface of the inner cylindrical portion 12. The cylindrical portion 29 and the inner cylinder portion 12 are firmly connected by the fitting of the convex strip portion and the groove portion. In addition, the cylindrical portion 29 and the inner cylindrical portion 12 may be connected by means such as screw fitting, transition fit, or the like.

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 of the net holder 14. In addition, a plurality of protrusions 30 protruding inward in the radial direction are formed on the inner peripheral surface of one end of the cylindrical portion 29 below the portion with the large inner diameter. The protrusion 30 is used to define 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 a shaft-shaped member described later to push the shaft-shaped member. Furthermore, in order to avoid hindering the flow of the content in the flow path P, the inner diameter of the protruding portion 30 is set to the inner diameter of the net holder 14. Moreover, as shown in FIG. 1, when the nozzle body 9 is at the top dead center position, a margin is set between the upper end of the valve body of the shaft-shaped member described later and the side surface of the protrusion 30 that is in contact with the upper end. Clearance C1. The lower end portion of the net holder 14 is fitted into a fitting portion formed by a portion with a large inner diameter among one end portion of the cylindrical portion 29 and the protrusion portion 30. 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 therebetween. Therefore, if the top surface 10 of the nozzle body 9 is pressed toward the container 2 side and the nozzle body 9 is pressed, the air piston 21 will move toward the container 2 side together with the nozzle body 9 to be moved by the air cylinder 18 and the air piston 21. The volume of the partitioned air chamber 24 or the substantial internal volume of the air chamber 24 decreases. Furthermore, the inside of the air chamber 24 is pressurized, and the air in the air chamber 24 is forced out from the air chamber 24. In addition, when the air piston 21 is pressed toward the container 2 by the amount of the clearance C1, the protrusion 30 will contact the upper end of the valve body of the shaft-shaped member and press the shaft-shaped member toward the container 2 side.

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 cylindrical shape extending in the axial direction, and one end portion (the upper end portion in FIG. 1) is fitted to the other end portion of the cylindrical portion 29. Specifically, at the other end portion of the cylindrical portion 29, a recessed portion recessed in the axial direction into which one end portion of the liquid piston 31 is fitted is formed. The inner diameter of the recessed portion is set to an inner diameter of the degree to which one end of the liquid piston 31 fits. In addition, between the recess and one end of the liquid piston 31, an air flow path (not shown) is formed. The space between the other end of the cylindrical portion 29 in the axial direction and the fitting portion of the liquid piston 31 and the mesh holder 14 fitted in the interior of the cylindrical portion 29 is for air and liquid content. Mixing chamber 32 for mixing of materials. One end of the air flow path communicates with the flow path P in the cylindrical portion 29, and the other end communicates with the space partitioned by the liquid piston 31 and the air piston 21.

On the outer peripheral surface of the liquid piston 31, a flange 33 protruding outward in the radial direction is formed. The flange 33 is used to restrict the lower limit positions of the air piston 21 and the liquid piston 31 as described above. In addition, as shown in FIG. 1, when the nozzle body 9 is at the top dead center, the upper surface of the flange 33 is in contact with the air discharge valve 28. The other end of the liquid piston 31 is fitted with the inner peripheral surface of the liquid cylinder 19 so as to slide in the axial direction (the vertical direction in FIG. 1) while maintaining the liquid-tight state. Therefore, the liquid cylinder 19 and the liquid piston 31 constitute the above-mentioned liquid pump, and the cylindrical space formed by the liquid cylinder 19 and the liquid piston 31 becomes the liquid chamber 34. As described above, if the top surface 10 of the nozzle body 9 is pressed toward the container 2 and the nozzle body 9 is pressed, the liquid piston 31 will move toward the container 2 together with the air piston 21, so that the volume of the liquid chamber 34 or the liquid chamber The substantive volume of 34 decreased. Furthermore, the inside of the liquid chamber 34 is pressurized, and the liquid in the inside of the liquid chamber 34 is pressed out from the liquid chamber 34.

In addition, a reset mechanism and a valve mechanism are arranged inside the liquid chamber 34. When the force of pressing the nozzle body 9 and the pistons toward the container 2 side is released, the reset mechanism is to reset the nozzle body 9 and the pistons to their original positions. The valve mechanism is in response to the pump pressure of the nozzle body 9, and communicates the liquid chamber 34 with the inside of the container 2, and also communicates the liquid chamber 34 with the mixing chamber 32 and the flow path P. First, the reset mechanism will be described. The reset mechanism, in the embodiment shown here, is configured to reset the nozzle body 9 and the respective pistons 21 and 31 by a coil spring (hereinafter referred to as "spring") 35. At the other end of the liquid piston 31, a spring receiving portion into which one end of the spring 35 is fitted is formed, and the same spring receiving portion is also provided on the inner peripheral portion of the bottom of the liquid cylinder 19. The spring 35 is arranged between these spring accommodating parts in a compressed state. Therefore, the liquid piston 31 is always given an elastic force that pushes upward toward the side opposite to the container 2 side (upper side in FIG. 1).

The above-mentioned valve mechanism will be described, and the shaft-shaped member 36 is arranged along the center axis of the liquid cylinder 19. One end (upper end in FIG. 1) of the shaft-shaped member 36 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 of the shaft-shaped member 36. On the other hand, at one end of the liquid piston 31, an annular convex portion that protrudes toward the inner side in the radial direction, that is, the center side of the flow path P, is formed. The annular convex portion is located closer to the container 2 than the valve body 37, and its minimum inner diameter is set to be smaller than the outer diameter of the valve body 37 so as to engage with the tapered surface of the valve body 37. The upper surface of the annular convex portion (the surface facing the tapered surface of the valve body 37) is formed in a tapered shape whose inner diameter gradually increases on the upper side. Therefore, the annular convex portion is configured to contact the valve body 37 from the lower side of FIG. 1 to seal the flow path P and the liquid chamber 34 in a liquid-tight state. That is, the annular convex portion becomes the valve seat portion 38.

The other end portion (lower end portion of FIG. 1) of the shaft-shaped member 36 on the side opposite to the valve body 37, in the example shown in FIG. 1, has a downward arrow shape or a cross-sectional triangular shape. The other end is inserted into the cylindrical locking body 39 provided at the bottom of the liquid cylinder 19, contacts the inner circumferential surface of the locking body 39, and slides on the inner circumferential surface of the locking body 39 in this state . More specifically, the outer diameter of the lower end 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 the outer diameter is elastically deformed to be inserted into the locking body 39. internal. In other words, at the other end of the shaft-shaped member 36, an elastic force is generated such that the outer peripheral surface thereof is in contact with the inner peripheral surface of the locking body 39, and the load that moves the shaft-shaped member 36 in the axial direction does not act on the shaft-shaped member. In the state of 36, the elastic force and the frictional force between the inner peripheral surface of the locking body 39 and the other end of the shaft-shaped member 36 are used to prevent movement in the axial direction. In other words, the other end portion of the shaft-shaped member 36 serves as the engaging portion 40 with respect to the locking body 39.

The inner peripheral portion of the one end portion (upper end portion of FIG. 1) of the locking body 39 is formed in the above-mentioned arrow shape or cross-sectional triangular shape, and becomes the jaw portion of the hook on the engaging portion 40 of the shaft member 36 The hook 41. This prevents the shaft member 36 from being detached from the locking body 39, and prevents further movement of the nozzle body 9 and the respective pistons 21 and 31. This position is the end of the stroke of the nozzle body 9 and the pistons 21, 31 when the pistons 21, 31 are reset to their original positions, that is, the top dead center. On the side surface of the lower side of the locking body 39 in the axial direction, a plurality of opening grooves 42 that become the flow path of the liquid content are formed at a certain interval in the circumferential direction. Since the inner side of the locking body 39 communicates with the inside of the container 2 as described below, the contents can flow from the inner side of the locking body 39 to the liquid chamber 34 outside the opening groove 42 through the opening groove 42.

A check valve is provided at the bottom of the liquid cylinder 19, which is opened when the contents are sucked up from the inside of the container 2 and filled into the liquid chamber 34, and closed when the contents are pushed out from the liquid chamber 34 . The above-mentioned check valve, in the example shown here, is constituted by a ball valve 43, and a tapered valve seat portion 44 whose inner diameter gradually increases on the upper side is formed at the bottom of the liquid cylinder 19. The ball 45 is arranged so as to contact the tapered surface of the valve seat portion 44 from the upper side of the valve seat portion 44 in the axial direction. Furthermore, a tube 46 is connected to the bottom of the liquid cylinder 19, and the tube 46 is used to introduce the contents filled in the container 2 into the liquid chamber 34. The front end of the tube 46 extends to the vicinity of the bottom of the container 2 (not shown).

Next, the function of the pump-type foam generator 1 of the present invention will be explained. When no force is applied to the nozzle body 9 to press the nozzle body 9, the nozzle body 9 is located at the top dead center as shown in FIG. 1. In the state shown in FIG. 1, the pistons 21, 31 are pushed upward in the cylinders 18, 19 (upward in FIG. 1) by the elastic force of the spring 35. Therefore, the valve seat portion 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. In addition, the engaging portion 40 of the shaft-shaped member 36 is hooked to the hook portion 41 of the locking body 39 to prevent it from being detached from the locking body 39. The ball 45 of the ball valve 43 is in contact with the valve seat 44 by the content in the liquid chamber 34 or its own weight, and the communication between the liquid chamber 34 and the inside of the container 2 is blocked. Furthermore, the first suction hole 20 formed in the air cylinder 18 is closed by the sliding portion 23 of the air piston 21. Furthermore, because the air piston 21 is not moved in the axial direction, the volume of the air chamber 24 does not change, and the second suction hole 25 is covered by the air suction valve 27, and the air discharge valve 28 and the liquid piston 31 are maintained. The flange 33 is in contact with each other. In other words, both the air suction valve 27 and the air discharge valve 28 are closed.

If the nozzle body 9 is slightly pressed from the state shown in FIG. 1, the pistons 21 and 31 are pressed toward the container 2 side by receiving this pressing force. FIG. 2 shows a state where the nozzle body 9 is slightly pressed toward the container 2 side. 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, and the like. In addition, at this point, forces other than the aforementioned elastic force and frictional force are not acting 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 is maintained in a stopped state with respect to the cylinders 18 and 19. In addition, the shaft-shaped member 36 moves relative to the liquid piston 31. In this way, the relative movement of the shaft-shaped member 36 and the liquid piston 31 continues until the air piston 21 is further pressed to bring the protrusion 30 formed on the inner peripheral surface of the cylindrical portion 29 into contact with the valve body 37 of the shaft-shaped member 36 That is, it continues until the liquid piston 31 moves toward the container 2 side by the amount of the above-mentioned clearance C1.

In addition, FIG. 3 is a partial enlarged view of the pump-type foam generator 1 when the nozzle body 9 is slightly pressed. When the liquid piston 31 is pressed 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. Thereby, 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 are communicated with each other. The spring 35 contracts to an extent equivalent to the pressing of the liquid piston 31, and the internal volume of the liquid chamber 34 decreases, thereby increasing the internal pressure of the liquid chamber 34. Furthermore, the ball 45 of the ball valve 43 is further pressed against the valve seat portion 44 to maintain a state in which the communication between the liquid chamber 34 and the inside of the container 2 is blocked, and the contents of the liquid chamber 34 are filled in the shaft member 36 and the valve The gap between the seats 38 flows and is further pressed out to the mixing chamber 32.

When the air piston 21 is pressed toward the container 2 side, the sliding portion 23 moves to the lower side of the first suction hole 20 so that the space above the piston head 22 communicates with the outside of the container 2 through the first suction hole 20. In addition, the internal volume of the air chamber 24 is reduced by the amount corresponding to the pressing of the pistons 21 and 31. By increasing the internal pressure of the air chamber 24, the air suction valve 27 is pressed against the second suction hole 25. On the other hand, let the air discharge valve 28 leave the flange 33 of the liquid piston 31. As a result, the air inside the air chamber 24 flows out from the air discharge valve 28, flows through the air flow path formed in the fitting part of the cylindrical part 29 and the liquid piston 31, and is forced out into the mixing chamber 32.

In addition, because the gap between the shaft 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 is narrow, the content in the liquid chamber 34 flows to the mixing chamber at an increased flow rate. 32 supplies. Because the air flow path described above is narrow, the air pressed from the air chamber 24 is supplied to the mixing chamber 32 in a state where the flow velocity is increased. Therefore, in the mixing chamber 32, the air and the liquid content are stirred to form foam.

If the nozzle body 9 is further pressed from the state shown in FIGS. 2 and 3, the protrusion 30 will contact the valve body 37 of the shaft-shaped member 36. Furthermore, when the nozzle body 9 is further pressed in a state where the protrusion 30 is in contact with the valve body 37, the shaft-shaped member 36 is pressed toward the container 2 side by the respective pistons 21 and 31. In other words, the shaft-shaped member 36 is moved integrally with the pistons 21 and 31. Also in this state, the shaft-shaped member 36 moves relative to each of the cylinder blocks 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 forced out from the air chamber 24 to the mixing chamber 32. Similarly, the contents inside the liquid chamber 34 are forced out from the liquid chamber 34 to the mixing chamber 32. In the mixing chamber 32, the air and the contents are stirred as described above to form a foam, and the air and the contents pressed from the air chamber 24 and the liquid chamber 34 press the foam from the mixing chamber 32 toward the net holder 14. And by passing the above-mentioned foam through the net holder 14, it becomes fine and homogeneous, flows through the flow path P in this state, and is discharged from the nozzle 11 to the outside.

As described above, if the pistons 21, 31 are moved toward the container 2 side so that the flange 33 of the liquid piston 31 contacts the boundary between the air cylinder 18 and the liquid cylinder 19, the nozzle body 9 and the pistons 21, 31 are further moved (Push in) will be blocked. This position is the end of the stroke of the nozzle body 9 and each piston 21, 31 on the bottom dead center side, and this state is shown in FIG. 4. And the content is discharged, the pressure inside the air chamber 24 and the liquid chamber 34 is reduced, and when the pressure becomes equal to the external pressure, the discharge of the content is stopped.

Figure 5 is a schematic diagram showing the process of the nozzle body 9 and the pistons 21, 31 returning from bottom dead center to the top dead center. Figure 5(A) is a partial enlarged view showing the state where the pistons 21, 31 are located at the bottom dead center. Fig. 5(B) is a partial enlarged view showing the state in which the pistons 21, 31 are slightly pushed up toward the mouth 3 side of the container 2 by the elastic force of the spring 35, and Fig. 5(C) shows the state of being pushed up by the spring 35 A partial enlarged view of the state in which the pistons 21, 31 are pushed up by the elastic force of φ to press the valve seat portion 38 against the valve body 37. When each piston 21, 31 is located at the bottom dead center, as shown in FIG. 5(A), the valve body 37 of the shaft-shaped member 36 and the valve seat portion 38 of the liquid piston 31 are separated.

When the pressing force on the nozzle body 9 is released from the state shown in FIG. 5(A), the nozzle body 9 and the pistons 21 and 31 start to return to the mouth 3 side of the container 2 by the elastic force of the spring 35. In addition, at the time when the respective pistons 21 and 31 are reset by the elastic force of the spring 35, no force other than the above-mentioned elastic force and frictional force is applied to the shaft-shaped member 36. Therefore, the shaft-shaped member 36 is held and fixed by the locking body 39, in other words, is in a stopped state with respect to each of the cylinders 18 and 19. The shaft-shaped member 36 moves relative to the liquid piston 31. Therefore, as shown in FIG. 5(B), the valve seat portion 38 formed at one end of the liquid piston 31 is brought close to the valve body 37 formed at one end of the shaft-shaped member 36.

If the liquid piston 31 is reset and moved toward the mouth 3 side of the container 2 in this way, the internal volume of the liquid chamber 34 increases, and the internal pressure becomes a negative pressure lower than the atmospheric pressure. In the state shown in FIG. 5(B), since the valve seat portion 38 of the liquid piston 31 has not yet contacted the valve body 37 of the shaft-shaped member 36, a gap is generated between the shaft-shaped member 36 and the valve seat portion 38. Therefore, the liquid chamber 34 communicates with the mixing chamber 32 and the flow path P through the aforementioned gap, and also communicates with the nozzle 11. Therefore, at least a part of the foamy content 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 due to the above-mentioned negative pressure. In this way, the foamed content in the flow path P is sucked back into the liquid chamber 34 in the action state, when the nozzle body 9 and the pistons 21, 31 are reset and moved by the elastic force of the spring 35 and reach the liquid chamber It continues to occur until the state of communication between 34 and the flow path P is cut off. Specifically, it occurs until the upper end portion of the valve seat portion 38 in the axial direction and the portion of the tapered surface of the valve body 37 that is in contact with the aforementioned upper end portion come into contact with each other. In addition, due to the negative pressure described above, the ball 45 is separated from the valve seat portion 44, and the liquid content filled in the container 2 is sucked upward into the liquid chamber 34 through the tube 46. In addition, the foamy content is lighter than the liquid content and is easier to suck back into the liquid chamber 34 by the above-mentioned negative pressure. Therefore, the amount of foamy content sucked back into the liquid chamber 34 becomes smaller than There are many liquid contents. In the case where the liquid piston 31 is reset and moved from the bottom dead center to the top dead center, the upper end of the valve seat portion 38 in the axial direction and the taper surface of the valve body 37 are in contact with the upper end. The clearance C2 corresponds to the immobile area and the movement length of the piston in the embodiment of the present invention. In addition, the clearance C2 has the same length as the above-mentioned clearance C1.

In addition, if the air piston 21 is returned to the mouth 3 side of the container 2 by the elastic force of the spring 35, the internal volume of the air chamber 24 increases with this, and therefore the pressure inside the air piston 21 decreases. Thereby, the internal pressure of the air chamber 24 becomes a negative pressure lower than the atmospheric pressure. With this negative pressure, the air discharge valve 28 is pressed against the flange 33 of the liquid piston 31. On the other hand, the air suction valve 27 is displaced toward the air chamber 24 side by the negative pressure, and the second suction hole 25 is separated. Therefore, by the above-mentioned negative pressure, the air outside the container 2 is allowed to pass through the air flow path between the guide rod portion 8 and the outer cylinder portion 13, and the air flow path between the guide rod portion 8 and the inner cylinder portion 12, etc. It reaches the space above the piston head 22 and is sucked into the air chamber 24 through the second suction hole 25 from this space.

If the nozzle body 9 and the respective pistons 21, 31 are further reset and moved toward the mouth 3 side of the container 2 by the elastic force of the spring 35, specifically, if the same length as the above-mentioned clearance C2 is made toward the mouth 3 of the container 2 When the pistons 21 and 31 are pushed up on the side, 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 Figure 5(C). In the state shown in FIG. 5(C), because the communication between the liquid chamber 34 and the flow path P is cut off, the suction from the nozzle 11 side by the above-mentioned negative pressure is stopped. On the other hand, the communication state between the liquid chamber 34 through the ball valve 43 and the inside of the container 2 is not cut off. Therefore, the liquid content filled in the interior of the container 2 is sucked upward toward the interior of the liquid chamber 34 through the tube 46 by the aforementioned negative pressure. In addition, because the communication state between the air chamber 24 and the outside is not cut off, the increase in the internal volume accompanying the return movement of the air piston 21 continues to occur, and the negative pressure accompanying the increase in the internal volume causes the air to flow into the air chamber 24 Internally attracted.

If the respective pistons 21, 31 are further reset and moved, 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, the shaft-shaped member 36 and the liquid piston 31 are integrated and move toward FIG. 5 ( The upper part of C) moves further. As a result, the inner volume of the liquid chamber 34 is further increased, and the contents filled in the container 2 are sucked upward into the liquid chamber 34 through the ball valve 43 by the negative pressure accompanying the increase in the inner volume. In the air chamber 24, the communication state between the air chamber 24 and the outside is not interrupted as described above. Therefore, the increase in the internal volume accompanying the return movement of the air piston 21 continues to occur. The negative pressure accompanying this increase in the internal volume reduces the air Attracted toward the inside of the air chamber 24.

If the pistons 21, 31 are reset to the mouth 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 hooked to the hook 41, and the nozzle body 9 and each The reset movement of the pistons 21, 31 is stopped. Furthermore, if the pressure inside the liquid chamber 34 and the pressure inside the container 2 become balanced, the upward suction of the contents filled in the container 2 is stopped. Similarly, if the pressure inside the air chamber 24 and the atmospheric pressure become balanced, the suction of air is stopped. In addition, the first suction hole 20 is closed by the sliding portion 23. Thereby, the communication between the inside and the outside of the container 2 is blocked, and the intrusion of foreign matter into the inside of the container 2 is prevented or suppressed. That is, the pump-type foam generator 1 is in the state shown in FIG. 1.

The pump-type foam generator 1 constructed in this way is to maintain the valve body 37 formed on the shaft member 36 when the nozzle body 9 and the pistons 21, 31 are reset from the bottom dead center to the top dead center. In the form of a state separated from the valve seat portion 38 formed on the liquid piston 31, a stationary region where the shaft-shaped member 36 is stopped with respect to each of the cylinders 18 and 19 is set. In other words, the communication state between the liquid chamber 34 and the flow path P is maintained during the period from the start of the return movement of the liquid piston 31 to the movement of a predetermined length or until the predetermined time has elapsed. Therefore, in the above-mentioned immovable region, the liquid piston 31 is returned to move while the flow path P is in communication with the liquid chamber 34, and negative pressure is generated as the internal volume of the liquid chamber 34 increases. As a result, due to the negative pressure described above, at least a part of the foamy content remaining in the flow path P from the liquid chamber 34 to the nozzle 11 is sucked back into the liquid chamber 34. In this way, it becomes difficult for the contents to remain in the flow path P, the tip portion of the nozzle 11, and the like. Moreover, it can prevent or suppress foam downflow and liquid downflow caused by foam liquefaction. In addition, because there is no need to provide a structure for suppressing the above-mentioned foam sag and liquid sag, the entire device can be made into a simple structure, which can reduce component and manufacturing costs.

In the pump-type foam generator 1 of the embodiment of the present invention, by changing the size of the clearance C2, in other words, the movable distance of the shaft-shaped member 36 in the axial direction relative to the movable distance of the pistons 21, 31 can be changed. The so-called suck-back function in which the contents remaining in the flow path P are sucked back into the liquid chamber 34 during the reset movement process of returning the respective pistons 21 and 31 to their original positions. In the experimental examples described below, the pump-type foam generators 1 were produced in which the clearance C2 was gradually increased from 1 mm to 15 mm by 0.5 mm, and the suction function of the pump-type foam generators 1 was evaluated. That is, in Experimental Example 1, a pump-type foam generator 1 with a clearance C2 of 1 mm was produced, and in Experimental Example 29, a pump-type foam generator 1 with a clearance C2 of 15 mm was produced. The suck-back function was evaluated. The evaluation results of each suck-back function of Experimental Example 1 to Experimental Example 29 are summarized and described in Table 1 below. The length of the full stroke of each piston 21, 31 is set to 15mm.

In addition, in Table 1, the movable distance of the shaft-shaped member 36 in the axial direction with respect to the movable distance of the respective pistons 21 and 31 is described as a percentage. In addition, the number of times of ineffective pump pressure refers to the state from the state in which the inside of the liquid chamber 34 of the pump foam generator 1 installed in the container 2 is not filled with contents until the contents filled in the inside of the container 2 are sucked up The number of times the nozzle body 9 is pumped until the inside of the liquid chamber 34 is filled and the content is discharged from the nozzle 11. The discharge amount is the amount of foamy content discharged from the nozzle 11. In addition, each experiment on the number of invalid pump pressures and the discharge volume was performed multiple times, and the arithmetic averages of the number of invalid pump pressures and the discharge volume are shown in Table 1, respectively. Furthermore, the foam sag from the nozzle 11 was evaluated. The symbol "○" in the table indicates that the foam-like content is sucked back from the front end of the nozzle 11 toward the inside of the flow path P, and the foam from the front end of the nozzle 11 can be prevented or suppressed from flowing down. The "×" symbol indicates that the foamy content is not sucked back from the tip of the nozzle 11 toward the inside of the flow path P, so the foamy content still remains at or near the tip of the nozzle 11, which is difficult to suppress The bubbles flow down. The "△" symbol indicates that the evaluation result of the foam sag does not meet any of "○" and "×". For example, although foamy content is sucked back from the tip portion of the nozzle 11 toward the inside of the flow path P, the degree is small, and the foam may sag due to temperature, content type, vibration, or the like. In addition to the experimental examples 1 to 29 in the table, except for the above clearance C2, the pump-type foam generator 1 adopts the same configuration, and the number of invalid pump pressures, the discharge amount of the contents, and the nozzle 11 The foam sags, etc., are subjectively evaluated by a plurality of individuals.

(Overview) In the pump-type foam generator 1 of Experimental Example 1 to Experimental Example 3, as shown in Table 1, although the discharge amount was larger than that of Experimental Example 4 to Experimental Example 29, the evaluation result of foam sag was "×". This should be because the main reason is that the clearance C2 is short, and the time for the valve body 37 and the valve seat portion 38 to be separated during the above-mentioned reset movement is shortened, so it is not easy to suck the contents remaining in the flow path P back into the liquid The interior of room 34.

In Experimental Example 4, because the clearance C2 was increased compared to the above-mentioned Experimental Examples 1 to 3, the time for the valve body 37 and the valve seat portion 38 to separate during the resetting movement process became longer, so the foam flowed down. The evaluation result becomes "△". That is, in Experimental Example 4, it can be said that a suck-back function is produced. On the other hand, because the foamy content remaining in the inside of the flow path P is sucked back into the liquid chamber 34, the amount of liquid content sucked up from the inside of the container 2 toward the inside of the liquid chamber 34 is reduced. . Because of this main reason, compared with the discharge volume of Experimental Example 1 to Experimental Example 3, the discharge volume of the pump foam generator 1 of Experimental Example 4 is reduced, and the number of invalid pump pressures is increased.

In Experimental Example 5 to Experimental Example 23, because the clearance C2 was increased compared to Experimental Example 4, the evaluation result of foam sag was "○". In other words, if the movable distance of the shaft-shaped member 36 in the axial direction exceeds 20% with respect to the movable distance of the respective pistons 21 and 31, it can be said that a good suck-back function is produced. In addition, in each pump foam generator 1 of Experimental Example 5 to Experimental Example 23, it can be seen that as the clearance C2 increases, its discharge volume decreases, and the number of ineffective pumping pressure increases. This should be as described above. As the clearance C2 increases, the amount of content sucked back from the nozzle 11 to the inside of the liquid chamber 34 increases, so the liquid is sucked upward from the inside of the container 2 toward the inside of the liquid chamber 34 The amount of contents is reduced. In Experimental Example 5~Experiment Example 23, although the number of invalid pump pressures is the same, this should be caused by manufacturing errors. The overall tendency can be seen that the ineffective pump pressure is caused by the increase in clearance C2. The number of times increases. In addition, the number of invalid pump pressures of Experimental Example 5 to Experimental Example 23 is 3 to 5 times, which is within the range of the index pumping frequency (3 to 5 times) that does not cause abnormal feeling and pressure to the user. .

In addition, in Experimental Example 24 to Experimental Example 29, since the clearance C2 was sufficiently large, a better suction function was produced than in each of the above-mentioned experimental examples, and the evaluation result of the foam sag was "○". On the other hand, since the amount of foamy content 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 invalid pump pressures is further increased. In particular, the number of invalid pump pressures can be seen to increase significantly, and it takes longer for the user to spit out the contents, which may cause abnormal feelings and pressure. Therefore, the movable distance of the shaft-shaped member 36 in the axial direction, that is, the stroke amount is preferably set to 20% or more and 80% or less of the full stroke amount of each piston 21, 31.

In addition, the present invention is not limited to the above-mentioned embodiment. The pump type discharge device of the embodiment of the present invention is not limited to the so-called pump type which mixes the liquid content filled in the container 2 with air to foam and discharge it. In addition to the foam generator 1, it may also be a pump dispenser that spits out the liquid filled in the container 2 as it is. In short, what is necessary is just to be configured to suck the contents remaining in the vicinity of the nozzle back into the space partitioned by the piston and the cylinder when the piston is returned to move.

1: Pump type foam generator (pump type spitting device) 2: container 3: mouth 11: Nozzle 19: Liquid cylinder 30: protrusion 31: Liquid piston 34: Liquid chamber (the space divided by the cylinder and the piston) 35: Spring (reset mechanism) 36: Shaft-shaped member 37: Valve body (one end of the shaft-shaped member) 38: Valve seat 40: Engagement part (the other end of the shaft-shaped member) P: Flow path C2: Clearance (fixed area)

Fig. 1 is a cross-sectional view showing an example of the pump type discharge device according to the embodiment of the present invention. Fig. 2 is a cross-sectional view of the pump-type discharge device when the nozzle body is slightly pressed from the top dead center toward the container side. Fig. 3 is a partial enlarged view of the pump-type discharge device when the nozzle body is slightly pressed from the top dead center toward the container side. [Fig. 4] is a cross-sectional view of the pump-type discharge device when each piston is located at the bottom dead center. [Figure 5] is a schematic diagram showing the process of returning the nozzle body and each piston from the bottom dead center to the top dead center. Figure 5(A) is a partial enlarged view of the pump-type discharge device when the pistons are located at the bottom dead center. Fig. 5(B) is a partial enlarged view of the pump-type discharge device when the pistons are slightly pushed up toward the mouth side of the container by the elastic force of the spring, and Fig. 5(C) is the elastic force of the spring to push the pistons upward. A partial enlarged view of the pump-type discharge device with the valve seat pressed against the valve body by pushing upward.

8: Guide rod

12: Inner cylinder

14: Net holder

21: Air piston

29: Cylinder

30: protrusion

32: Mixing room

36: Shaft-shaped member

37: Valve body (one end of the shaft-shaped member)

38: Valve seat

C2: Clearance (fixed area)

Claims (3)

A pump type discharge device is provided with a cylinder, a piston, a flow path, a shaft-shaped member, a valve body, a valve seat part, a protrusion part and a reset mechanism, The cylinder is attached to the mouth of the container in a state in communication with the inside of the container, The piston is fitted into the cylinder so as to be able to reciprocate in the axial direction of the cylinder, The flow path is formed to penetrate the piston in the axial direction, one open end of which is in communication with the nozzle, and the other open end of which is in communication with the space partitioned by the cylinder and the piston, The shaft-shaped member has one end inserted into the flow path along the center axis of the flow path, and the other end is arranged inside the space, and is held so as to be relatively movable in the axial direction with respect to the cylinder. , The valve body is formed by increasing the outer diameter at the one end of the shaft-shaped member, The valve seat portion is formed inside the flow path, and the flow path is closed by moving the piston in a direction to increase the volume of the space so that it is in close contact with the valve body. The protruding portion is formed inside the flow path on the opposite side of the valve seat portion with the valve body interposed in the axial direction, and the piston moves in the direction to reduce the volume of the space to make it and The aforementioned valve body contacts and pushes the aforementioned shaft-shaped member, The aforementioned reset mechanism presses the aforementioned piston in the direction of pressing the aforementioned valve seat portion against the aforementioned valve body; By pressing the piston, the valve body is separated from the valve seat portion and the volume of the space is reduced, and the content filled in the space is discharged from the nozzle through the flow path, characterized in that: It is provided with a stationary area that stops the shaft-shaped member with respect to the cylinder and maintains a state in which the valve body and the valve seat portion are separated, In the immovable area, the negative pressure accompanying the increase in the volume of the space generated by the displacement of the piston in the direction of increasing the volume of the space by the return mechanism generates suction from the nozzle. The pump type discharge device according to claim 1, wherein: The immovable region, when the piston is moved from the state where the volume of the space is the smallest in the direction of increasing the volume of the space, is the length of movement of the piston during which the piston moves relative to the shaft-shaped member, The length of the movement refers to the case where the piston is moved from the state in which the volume of the space is the smallest in the direction in which the volume of the space is increased. The upper end of the valve seat and the valve body in the axial direction The length between the parts in contact with the aforementioned upper end. The pump type discharge device according to claim 1 or 2, wherein: The movable distance of the shaft-shaped member in the axial direction is 20% or more and 80% or less of the movable distance of the piston.

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