JP6808869B1 - Pump dispenser and discharge container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump dispenser capable of suppressing deviation of an inner rod and an axial center of a plug from a central axis. SOLUTION: A pump dispenser has a tubular nozzle that reciprocates along a central axis, a tubular cylinder, a tubular air piston, a tubular liquid piston, an inner rod, and a tubular plug. And an urging member. The liquid piston is supported inward of the air piston. The inner rod is inserted inward of the liquid piston and can move along the axis. The plug defines the range of movement in which the inner rod moves along the axis. One end of the urging member is supported by the liquid piston and the other end is supported by the plug. The plug has at least three protrusions on its inner peripheral surface that are spaced apart in the circumferential direction and project toward the axis of the plug. At least three protrusions extend parallel to the axis of the plug. [Selection diagram] Fig. 9

Description

The present invention relates to a pump dispenser and a discharge container.

For example, Patent Document 1 discloses a pump dispenser in which a liquid stored in a container is mixed with air by pushing down a nozzle and discharged in a foamed state. When assembled, the pump dispenser unitizes the liquid piston, inner rod, plug, and coil spring as part of the piston unit.

JP-A-2002-086029

It is desirable that the axis of the liquid piston, the inner rod, and the plug of the piston unit of Patent Document 1 be along a predetermined central axis. However, the inner rod and plug of the piston unit may deviate from the central axis due to, for example, the urging force of the coil spring.

An object of the present invention is to provide an inner rod, a pump dispenser capable of suppressing the axial center of a plug from deviating from the central axis, and a discharge container.

The pump dispenser according to one aspect of the present invention has a support portion having a tubular shape and a central axis defined, and a discharge cylinder, and has a first position along the central axis with respect to the support portion and the first position. A tubular piston that reciprocates between a second position different from the position, is supported by the support portion, forms a liquid chamber in a region including the central axis, and forms an air chamber around the central axis. A cylinder, a tubular air piston that is supported by the nozzle and moves in the cylinder according to the reciprocating motion of the nozzle along the central axis to change the volume of the air chamber, and an inner side of the air piston. It is arranged between the cylinder and the air piston, forms a part of the cylinder and the liquid chamber, and moves with the air piston according to the reciprocating movement of the nozzle along the central axis to adjust the volume of the liquid chamber. A tubular liquid piston that changes and forms a mixing chamber between the air piston and the liquid body in the air chamber and the liquid material in the liquid chamber is inserted into the liquid piston and the nozzle. An inner rod that moves along the axial center with the reciprocating motion of the inner rod, and the inner rod that is housed in the liquid chamber of the cylinder and that the inner rod moves with respect to the cylinder along the axial center of the inner rod. A tubular plug that defines the range of movement of the inner rod and a tubular plug that is provided around the plug, one end is supported by the liquid piston and the other end is supported by the plug, and the plug is separated from the liquid piston. It is equipped with an urging member. The plug has at least three convex portions on its inner peripheral surface that are spaced apart in the circumferential direction and project toward the axial center of the plug. The at least three protrusions extend parallel to the axis of the plug.

As one aspect of the present invention, the discharge container includes the above-mentioned pump dispenser and a container body that can be attached to and detached from a support portion of the pump dispenser.

According to the present invention, it is possible to provide an inner rod, a pump dispenser capable of suppressing deviation of the axis of the plug from the central axis, and a discharge container.

The cross-sectional view which shows the structure of the discharge container which concerns on one Embodiment of this invention. FIG. 5 is a cross-sectional view showing a configuration of a pump body of the discharge container shown in FIG. FIG. 2 is a cross-sectional view showing a state in which the nozzle of the pump body shown in FIG. 2 is pushed down toward the support portion. FIG. 3 is a cross-sectional view showing a state in which the nozzle of the pump body shown in FIG. 3 is pushed down most toward the support portion. FIG. 5 is a cross-sectional view showing a state in which the pressure of the nozzle of the pump body shown in FIG. 4 is released and the nozzle is moving toward the position shown in FIG. FIG. 2 is a cross-sectional view showing the configuration of a piston unit of the pump body shown in FIG. The schematic diagram which shows the inner rod in FIGS. 1 to 6. The schematic diagram which shows the plug in FIGS. 1 to 6. Schematic cross-sectional view showing a state in which the inner rod and the plug are fitted. A table showing a test method for measuring the resin type, flexural modulus and flexural modulus of the inner rod and plug. A table showing the moldability of the inner rod and the plug with respect to the flexural modulus of the inner rod and the plug, the suitability for incorporating the inner rod and the plug, and the magnitude of the deviation of the inner rod and the plug from the axial center. Table showing resin type of inner rod and plug, flexural modulus, gap between engaging part of inner rod and inner peripheral surface of plug, and B-type viscosity of liquid material. A modified example of a schematic cross-sectional view showing a state in which the inner rod and the plug are fitted.

The discharge container 1 according to the embodiment will be described with reference to FIGS. 1 to 11.
FIG. 1 is a cross-sectional view showing the configuration of the discharge container 1 according to the embodiment. In the present embodiment, as shown in FIG. 1, the vertical direction is such that the container body 2 side of the discharge container 1 is downward and the nozzle 24 side of the pump body 3 is upward.

2 to 5 are cross-sectional views showing a series of operations of the pump body 3. FIG. 6 is a cross-sectional view showing a piston unit 28 of the pump body 3. Each figure in FIG. 7 shows an inner rod 110 of the piston unit 28 of the pump body 3. Each figure in FIG. 8 shows a plug 112 of the piston unit 28 of the pump body 3. FIG. 9 shows a cross-sectional view of the inner rod 110 shown in FIG. 7 and the plug 112 shown in FIG. 8 in a fitted state. In FIG. 9, the outermost diameter portion of the engaging portion 166 of the inner rod 110 is shown by a broken line in order to show the relationship of the clearance between the annular portion 182 and the convex portion 188 of the plug 112.

The discharge container 1 includes a container body 2, a pump body (pump dispenser) 3, and a pipe body 4. The discharge container 1 is a so-called hand pump in which the liquid material 400 stored in the container body 2 is sucked up through the pipe body 4 by the pump body 3 and is foamed by the pump body 3 and discharged to the outside.

The liquid body 400 is a content stored in the container body 2. As the liquid body 400, for example, a liquid containing a surfactant such as shampoo, hand soap, face wash and shaving cream is used. Pharmaceuticals can also be used as liquids.

The container body 2 has a bottomed tubular shape, for example, a bottomed cylindrical shape. The container body 2 can store the liquid material 400 inside the container body 2. The container body 2 is made of a metal material, glass, pottery, a resin material, or the like. The container body 2 includes a main body 12 in which the liquid material 400 is stored, and a first fixing portion 14 having an opening in which a part of the upper end of the main body 12 protrudes and opens. The first fixing portion 14 has a male screw portion 16 integrally molded on the outer peripheral surface.

The tube body 4 is a tube that is preferably flexible. One end of the pipe body 4 is connected to the pump body 3, and the other end is a free end. The other end of the tube 4 comes into contact with, for example, the bottom surface of the container 2.

As shown in FIGS. 2 to 5, the pump body (pump dispenser) 3 includes a support portion 22, a nozzle 24, a cylinder 26, a piston unit 28, and a spherical valve body 30.

The support portion 22 is a shoulder portion that is continuous between the nozzle guide cylinder 32, the container fixing cylinder 34 having a diameter larger than that of the nozzle guide cylinder 32 and being fixed to the container body 2, and the nozzle guide cylinder 32 and the container fixing cylinder 34. It includes 36. The nozzle guide cylinder 32, the shoulder portion 36, and the container fixing cylinder 34 are integrally formed of, for example, a resin material. A central axis C is defined for the support portion 22 along the axis. It is preferable that the support portion 22 is formed substantially symmetrically with respect to the central axis C. The nozzle guide cylinder 32, the shoulder portion 36, and the container fixing cylinder 34 are coaxial with each other. The central axis C is assumed to extend in the vertical direction in the present embodiment.

The appearance of the container fixing cylinder 34 and the shoulder portion 36 of the support portion 22 is not limited to being symmetrical with respect to the central axis C. The appearance of the container fixing cylinder 34 and the shoulder portion 36 of the support portion 22 may be formed in a shape that allows the user to easily rotate the support portion 22 with respect to the container body 2, for example.

The nozzle guide cylinder 32 guides the nozzle 24 so that the nozzle 24 can move along the central axis C. The inner peripheral surface of the container fixing cylinder 34 has a female screw portion 34a fixed to the male screw portion 16 of the container body 2. The shoulder portion 36 supports the cylinder 26 in a fixed state, and also supports the air piston 102 of the piston unit 28, which will be described later, so as to be movable between the contact position or the proximity position and the separation position.

The nozzle 24 is arranged above the support portion 22. The nozzle 24 has an inner cylinder 42, an outer cylinder 44 outside the inner cylinder 42, and a discharge cylinder 46 that continuously discharges a fluid to the inner cylinder 42. The inner cylinder 42, the outer cylinder 44, and the discharge cylinder 46 are integrated with, for example, a resin material.

The inner cylinder 42 and the discharge cylinder 46 form a fluid flow path 24a. The inner cylinder 42 and the outer cylinder 44 are concentric with respect to the central axis C. The inner cylinder 42 and the outer cylinder 44 reciprocate with respect to the support portion 22 between a first position (normal position) and a second position (pressing position) different from the first position along the central axis C. ..

The discharge cylinder 46 projects from the upper end of the inner cylinder 42, for example, in a cylindrical shape toward the side deviating from the central axis C.

A mesh filter 48 is supported inside the inner cylinder 42 of the nozzle 24. The mesh filter 48 is on the flow path 24a. The mesh filter 48 has, for example, two nets 48a and 48b separated from each other. When the liquid and gas pass through the nets 48a and 48b of the mesh filter 48 on the flow path 24a, the liquid material 400 tends to be foamy, and the liquid material 400 in the foam shape is discharged from the discharge cylinder 46 of the flow path 24a. To do.

The cylinder 26 is supported below the support portion 22. The cylinder 26 has a cylindrical shape. The cylinder 26 is integrally molded with, for example, a resin material. The cylinder 26 has a first cylinder 52, a second cylinder 54 having an inner peripheral surface having a diameter smaller than the inner peripheral surface of the first cylinder 52, and an inner peripheral surface having a diameter smaller than the inner peripheral surface of the second cylinder 54. It is provided with a mounting cylinder 56 to which the pipe body 4 is mounted. The axes of the first cylinder 52, the second cylinder 54, and the mounting cylinder 56 coincide with the central axis C of the support portion 22. The first cylinder 52, the second cylinder 54, and the mounting cylinder 56 are integrated.

The first cylinder 52 has a first sliding portion 62 having a constant inner diameter so that the air piston 102 of the piston unit 28 can slide. The first sliding portion 62 is formed with a through hole 62b penetrating between the inner wall and the outer wall of the first cylinder 52. The through hole 62b is formed at a position facing the female screw portion 34a of the container fixing cylinder 34 of the support portion 22, for example.

The first cylinder 52 has a fixing portion 64 supported by the shoulder portion 36 of the supporting portion 22 at the upper end. The fixing portion 64 is provided above the first sliding portion 62. The fixing portion 64 is supported by the shoulder portion 36 of the supporting portion 22 by, for example, fitting. The first cylinder 52 has a first annular portion 66 continuous with the second cylinder 54 at the lower end. The first annular portion 66 is provided below the first sliding portion 62.

The second cylinder 54 includes a second sliding portion 72 in which the liquid piston 104 described later of the piston unit 28 can move along the central axis C and has a constant inner diameter, and a cylinder of the piston unit 28 around the axis of the central axis C. It has a plug accommodating portion 74 for accommodating the shaped plug 112, and a second annular portion 76 for making the plug accommodating portion 74 and the mounting cylinder 56 continuous. The second annular portion 76 has a valve seat 76a of a spherical valve body (sphere) 30. The valve seat 76a is formed as an annular surface.

The piston unit 28 is supported by the nozzle 24 and is arranged in the support portion 22 and the cylinder 26. As shown in FIG. 6, the piston unit 28 includes an air piston 102, a liquid piston 104, an air chamber valve body 106, an auxiliary valve body 108, an inner rod (rod-shaped valve body) 110, a plug 112, and the like. It has an urging member 114.

The axis of the air piston 102 coincides with the central axis C. The air piston 102 is integrally molded with a resin material. The air piston 102 is located on the annular body portion 122, the annular holding portion 124 which is located closer to the central axis C than the body portion 122 and holds the air chamber valve body 106, and the central axis C rather than the holding portion 124. It has a tubular fitting cylinder 126 that is located close to the nozzle 24 and fits with the liquid piston 104.

When the air piston 102 moves along the central axis C, the body portion 122 slides on the inner peripheral surface 62a of the first sliding portion 62 of the cylinder 26. The body portion 122 has an arch in which the outer diameter of the upper and lower end portions of the surface of the first sliding portion 62 facing the inner peripheral surface 62a in the vertical direction is larger than the outer diameter of the portion between the upper end and the lower end. It is formed in a shape. The body portion 122 elastically deforms when it comes into contact with the inner peripheral surface 62a of the first sliding portion 62 of the cylinder 26, and maintains contact with the inner peripheral surface 62a of the first sliding portion 62 of the cylinder 26. However, since the shape of the arch changes, it is possible to prevent the sliding resistance from becoming too large.

The holding portion 124 projects upward from the body portion 122. The holding portion 124 has an annular first abutting portion 124a that guides the movement of the air piston 102 with respect to the support portion 22 in the direction along the central axis C and regulates the movable range.

The fitting cylinder 126 projects upward from the first abutting portion 124a of the holding portion 124. The fitting cylinder 126 has an outer fitting portion 132 that fits with the inner peripheral surface of the inner cylinder 42 of the nozzle 24 on its outer peripheral surface. Therefore, the air piston 102 moves with the movement of the nozzle 24. The fitting cylinder 126 has an inner fitting portion 134 on the inner peripheral surface thereof to which the upper end portion of the liquid piston 104 fits.

In the present embodiment, an annular auxiliary valve body (check valve) 108 is fixed to the inner peripheral surface adjacent to the upper side of the inner fitting portion 134 of the fitting cylinder 126. The auxiliary valve body 108 is formed in an annular shape by a rubber material or a resin material. The auxiliary valve body 108 may not be provided.

Inside the fitting cylinder 126, an air and liquid mixing chamber 136 is formed together with the upper end of the liquid piston 104. That is, a mixing chamber 136 for mixing the air in the air chamber 210 and the liquid material 400 in the liquid chamber is formed between the air piston 102 and the liquid piston 104. The mixing chamber 136 communicates with the flow path 24a of the nozzle 24 through the opening 138 on the central axis C above the mixing chamber 136. A plurality of ribs 136a capable of pressing the valve body 164 of the inner rod 110 are provided in the mixing chamber 136 inside the fitting cylinder 126 so as to be separated from each other in the circumferential direction of the central axis C. Each rib 136a is inclined from the upper end of the liquid piston 104 or the side close to the auxiliary valve body 108 toward the opening 138 toward the central axis C.

A plurality of through holes 102a that penetrate the air piston 102 in the vertical direction are formed between the body portion 122 and the holding portion 124.

The air chamber valve body 106 is formed in an annular shape and is made of a resin material having higher flexibility than the air piston 102. The air chamber valve body 106 has an outer annular valve body 142 and an inner annular valve body 144 at a position below the holding portion 124.

The outer annular valve body 142 is formed in an annular shape toward the outside with respect to the central axis C. The outer annular valve body 142 can be opened and closed with respect to the through hole 102a of the air piston 102. The inner annular valve body 144 is formed in an annular shape toward the central axis C. The inner annular valve body 144 can be opened and closed between the liquid piston 104 and the inside of the fitting cylinder 126. The outer annular valve body 142 and the inner annular valve body 144 can be elastically deformed and opened / closed due to a change in air pressure accompanying the movement of the nozzle 24.

The axis of the liquid piston 104 coincides with the central axis C. The liquid piston 104 is supported inside the air piston 102 between the cylinder 26 and the air piston 102. The liquid piston 104 forms a part of the air chamber 210 together with the cylinder 26 and the air piston 102. The liquid piston 104 forms a part of the cylinder 26 and the liquid chamber 220. The liquid piston 104 moves together with the air piston 102 according to the reciprocating movement of the nozzle 24 along the central axis C, and changes the volumes of the air chamber 210 and the liquid chamber 220.

The liquid piston 104 is integrally molded with, for example, a resin material. The liquid piston 104 has a tubular body 152, a valve seat 154, a support ring 156 that supports the upper end of the urging member 114, and a flange 158 that extends radially outward from the tubular body 152.

The upper end of the tubular body 152 is fitted to the inner fitting portion 134 of the fitting cylinder 126 of the air piston 102. On the outer peripheral surface of the upper end portion of the tubular body 152, a plurality of ribs 152a protruding radially outward from the central axis C are provided. The rib 152a integrates between the upper end of the tubular body 152 and the flange 158. It is preferable that the ribs 152a are formed on the outer peripheral surface of the upper end portion of the tubular body 152 at predetermined intervals in the circumferential direction. Between the ribs 152a adjacent to each other in the circumferential direction, the upper end portion of the tubular body 152 of the liquid piston 104 is fitted to the inner fitting portion 134 of the fitting cylinder 126 of the air piston 102 by the plurality of ribs 152a. An air passage that allows the flow of air is formed between the outer peripheral surface of the tubular body 152 of the liquid piston 104 and the inner fitting portion 134 of the fitting cylinder 126 of the air piston 102.

A valve seat 154 is provided on the inner peripheral surface of the upper end of the tubular body 152. The valve seat 154 is formed in an annular shape.

A support ring 156 is provided at the lower end of the tubular body 152. The outer diameter of the lower end portion of the tubular body 152 (sliding portion other than the sliding end portion of the tubular body 152) is the same as or the inner diameter of the second sliding portion 72 of the second cylinder 54 of the cylinder 26. 2 It is slightly larger than the inner diameter of the sliding portion 72. Therefore, the tubular body 152 of the liquid piston 104 can slide on the inner peripheral surface 72a of the second sliding portion 72 of the second cylinder 54 of the cylinder 26 while sealing the liquid chamber 220. The outer diameter of the tubular body 152 is larger than the inner diameter of the plug accommodating portion 74. The inner diameter of the second sliding portion 72 of the second cylinder 54 of the cylinder 26 is larger than the inner diameter of the plug accommodating portion 74. Therefore, the lower end of the movable range of the tubular body 152 is near the boundary between the second sliding portion 72 of the second cylinder 54 of the cylinder 26 and the plug accommodating portion 74.

The outer shape of the flange 158 is, for example, substantially rectangular. The flange 158 has four curved surfaces 158a continuous between vertices adjacent to the central axis C in the circumferential direction. The curved surface 158a approaches the central axis C as it moves away from the apex, and forms an air passage between the air chamber 210 and the inner annular valve body 144. A part of the outer edge of the flange 158 with respect to the central axis C faces the inner annular valve body 144 of the air chamber valve body 106. The inner annular valve body 144 of the air chamber valve body 106 contacts the flange 158 in an annular shape.

The inner rod 110 is defined with a straight axis that serves as the central axis of the inner rod 110. FIG. 7A shows a partial cross-sectional view of the inner rod 110. FIG. 7B shows the appearance of the inner rod 110 when the inner rod 110 is viewed from the direction indicated by the arrow 7B in FIG. 7A. FIG. 7C shows a cross section of the second shaft portion 174 of the shaft body 162 of the inner rod 110 along the line 7C-7C in FIG. 7B. FIG. 7D shows a cross section of the second shaft portion 174 of the shaft body 162 of the inner rod 110 along the line 7D-7D in FIG. 7B.

The inner rod 110 inserts the liquid piston 104 along the central axis C. The inner rod 110 is made of, for example, a resin material. The inner rod 110 shown in FIGS. 7 (A) to 7 (D) is provided at the shaft body (rod portion) 162, the valve body 164 provided at the upper end of the shaft body 162, and the lower end of the shaft body 162. It has an engaging portion (first engaging portion) 166. It is preferable that the inner rod 110 is formed axially symmetrically with respect to the axial center.

The shaft body 162 has a first shaft portion 172, a second shaft portion 174, and a shaft diameter changing portion 176. The first shaft portion 172 of the shaft body 162 is continuous with the valve body 164. The second shaft portion 174 of the shaft body 162 is continuous with the engaging portion 166. The first shaft portion 172 is formed in a columnar shape. The cross-sectional area orthogonal to the axis of the first shaft portion 172 continuous with the valve body 164 of the shaft body 162 is larger than the cross-sectional area of the second shaft portion 174 continuous with the engaging portion 166. Therefore, the distance between the tops of the protrusions (sliding resistance ribs) 178 of the second shaft portion 174 is smaller than the shaft diameter of the first shaft portion 172. That is, the distance between the axial center of the inner rod 110 and the top of the protrusion 178 is smaller than the radius of the first axial portion 172. The shaft diameter changing portion 176 in which the cross-sectional area between the first shaft portion 172 and the second shaft portion 174 of the shaft body 162 changes is formed in a tapered shape. The region where the diameter of the shaft body 162 changes may be formed as a step.

As shown in FIGS. 7 (C) and 7 (D), it is preferable that the cross section of the second shaft portion 174 including the protrusion 178 is not merely a circular shape. A protrusion 178 protruding outward in the radial direction is formed on the outer peripheral surface of the second shaft portion 174. The protrusion 178 is integrally formed on the outer peripheral surface of the second shaft portion 174. In the present embodiment, the outer circumference of the second shaft portion 174 including the protrusion 178 projects radially outward with respect to the arc portion and the arc portion centered on the axial center of the inner rod 110. It has a protrusion 178. The distance D1 between the tops of the pair of protrusions 178 is larger than the diameter D0 of the arc portion that does not include the protrusions 178 of the second shaft portion 174. In the present embodiment, a pair of protrusions 178 are formed axially symmetrically with respect to the axial center of the inner rod 110. As shown in FIGS. 7 (A) and 7 (B), the protrusion 178 is continuously formed along the axis to the same length as the length of the second shaft portion 174. The pair of protrusions 178 is used as a reinforcing material (bead). For example, when a compressive force is applied in the vertical direction along the axis of the inner rod 110, the second axis 174 is a straight axis. Suppresses bending that deviates from.

The valve body 164 of the inner rod 110 shown in FIGS. 7 (A) and 7 (B) is formed as, for example, a poppet valve. The vertical cross section including the axial center of the valve body 164 is formed in a substantially triangular pyramid shape or a substantially V shape having an inclined surface. The valve body 164 can be brought into contact with and separated from the valve seat 154 of the liquid piston 104. The valve body 164 can be brought in and out of the auxiliary valve body 108.

As shown in FIGS. 7 (A), 7 (B) and 7 (D), the engaging portion 166 of the inner rod 110 is cut off orthogonal to the axial center as compared with the second shaft portion 174 of the shaft body 162. It has an arc-shaped part with a large area. The engaging portion 166 is formed so as to taper downward.

The plug 112 is defined with a straight axis that serves as the central axis of the plug 112. FIG. 8A shows a partial cross-sectional view of the plug 112 along the axis, and FIG. 8B shows a cross-sectional view of the plug 112 along the axis. FIG. 8C shows a top view of the plug 112 as viewed from the direction indicated by the arrow 8C in FIG. 8A. FIG. 8D shows a top view of the plug 112 as viewed from the direction indicated by the arrow 8D in FIG. 8B. FIG. 8E shows a cross section of the plug 112 along the line 8E-8E in FIG. 8B. FIG. 8F shows a cross section of the plug 112 along the line 8F-8F in FIG. 8B.

The plug 112 shown in FIGS. 8 (A) to 8 (F) is formed of, for example, a resin material into a tubular shape. The plug 112 is provided with a ring portion (second engaging portion) 182 formed at the upper end, a flange portion 184 formed at the lower end, and a liquid passage (flow) provided at the lower end and penetrating the inside and outside of the plug 112. Road) with 186. The inner diameter of the inner peripheral surface 112a between the upper end and the lower end of the plug 112 is larger than the inner diameter of the annular portion 182 and smaller than the outer diameter of the flange portion 184.

As shown in FIGS. 8A and 8B, the annular portion 182 has a concave surface 182a that guides the engaging portion 166 when the tapered engaging portion 166 of the inner rod 110 is fitted to the plug 112. Have. The inner diameter of the annular portion 182 is formed so that the engaging portion 166 of the inner rod 110 is hooked. That is, the inner diameter of the annular portion 182 is formed to be smaller than the outer diameter of the engaging portion 166 of the inner rod 110. The engaging portion 166 of the inner rod 110 pushes the engaging portion 166 into the annular portion 182 of the plug 112 to elastically deform the engaging portion 166 and the annular portion 182, thereby causing the engaging portion 166 of the inner rod 110 to be elastically deformed. Is located on the lower end side of the annular portion 182 of the plug 112. The inner diameter of the annular portion 182 is larger than the outer diameter of the second shaft portion 174 of the shaft body 162. Therefore, the second shaft portion 174 of the shaft body 162 of the inner rod 110 can move along the axial center of the inner rod 110 and the plug 112 with respect to the annular portion 182 of the plug 112. The inner diameter of the annular portion 182 is smaller than the outer diameter of the shaft diameter changing portion 176 of the shaft body 162. Therefore, the shaft diameter changing portion 176 of the shaft body 162 is caught on the annular portion 182. Therefore, the shaft diameter changing portion 176 of the shaft body 162 can be engaged with the annular portion 182.

Therefore, the plug 112 and the inner rod 110 are relatively movable within a predetermined range. Therefore, the annular portion 182 of the plug 112 has a moving range of the inner rod 110 in which the shaft body 162 and the engaging portion 166 of the inner rod 110 move with respect to the cylinder 26 along the axial center of the inner rod 110 and the plug 112. To specify.

The outer diameter of the flange portion 184 is smaller than the inner diameter of the plug accommodating portion 74 of the second cylinder 54 of the cylinder 26. The outer diameter of the flange portion 184 is larger than the inner diameter of the valve seat 76a of the second annular portion 76 of the second cylinder 54. Therefore, the plug 112 is accommodated in the plug accommodating portion 74 with the flange portion 184 facing downward.

As shown in FIGS. 8 (A), 8 (B), 8 (D) to 8 (F), the plug 112 is located near the axis with respect to the inner peripheral surface 112a of the plug 112. It has at least three convex portions 188 that are spaced apart from the axial center in the circumferential direction. The convex portion 188 projects toward the axial center of the plug 112. It is preferable that the convex portion 188 has the same shape and the same size. If there are n convex portions 188 in the circumferential direction (n is a natural number of 3 or more), it is preferable that the convex portions 188 are located 360 / n ° apart from the axial center. That is, it is preferable that the convex portions 188 are equidistant from the axial center in the circumferential direction. In the present embodiment, four convex portions 188 are formed on the inner peripheral surface 112a of the plug 112 at intervals of 90 ° with respect to the axial center. The convex portion 188 may be formed in a continuous line shape parallel to the axis, or may be formed in a discontinuous dot shape. The convex portion 188 guides the shaft body 162 and the engaging portion 166 of the inner rod 110 to positions on the axis.

As shown in FIG. 7D, the axis of the second shaft portion 174 including the protrusion 178 of the shaft body 162 of the inner rod 110 coincides with the axis of the engaging portion 166 of the inner rod 110. The distance between the tops of the protrusions 178 of the shaft body 162 of the inner rod 110 is smaller than the outer diameter of the outermost diameter portion of the engaging portion 166 of the inner rod 110. Here, as shown in FIG. 9, the outer diameter of the outermost diameter portion of the engaging portion 166 of the inner rod 110 is larger than the inner diameter of the annular portion 182 of the plug 112. The outer diameter of the outermost diameter portion of the engaging portion 166 of the inner rod 110 is slightly smaller than the inner diameter of the convex portion 188 of the plug 112. Therefore, after the engaging portion 166 of the inner rod 110 is inserted between the annular portion 182 and the flange portion 184 through the annular portion 182 of the plug 112 due to mutual elastic deformation, the engaging portion of the inner rod 110 The 166 can move inside the convex portion 188 along the axial center of the inner rod 110 and the plug 112. The engagement portion 166 of the inner rod 110 with respect to the plug 112 is stopped from moving upward at the position of the annular portion 182 of the plug 112.

As shown in FIG. 7C, the distance between the tops of the protrusions 178 of the shaft body 162 is smaller than the outer diameter of the first shaft portion 172 at the upper end of the shaft diameter changing portion 176. Here, the outer diameter of the first shaft portion 172 at the upper end of the shaft diameter changing portion 176 is larger than the inner diameter of the annular portion 182 of the plug 112. The distance between the tops of the protrusions 178 of the shaft body 162 is slightly smaller than the inner diameter of the annular portion 182 of the plug 112. Therefore, the second shaft portion 174 of the shaft body 162 of the inner rod 110 is slidable with respect to the annular portion 182 of the plug 112. Therefore, when the inner rod 110 moves downward with respect to the plug 112, the shaft diameter changing portion 176 of the shaft body 162 of the inner rod 110 is engaged and stopped at the position of the annular portion 182 of the plug 112.

The urging member 114 is defined with a straight axis. The urging member 114 is made of, for example, a resin material or a metal material. As the urging member 114, a compression coil spring 192 wound around the axis in a coil shape is used. The upper end of the urging member 114 is supported by the support ring 156 of the liquid piston 104, and the lower end is supported by the flange portion 184 of the plug 112. The urging member 114 is outside the shaft body 162 of the inner rod 110 and outside the plug 112. The urging member 114 urges the liquid piston 104 toward the air piston 102. At this time, the valve body 164 at the upper end of the inner rod 110 is in close contact with the valve seat 154 of the liquid piston 104 and is in close contact with the auxiliary valve body 108. The engaging portion 166 of the inner rod 110 engages with the annular portion 182 of the plug 112.

The piston unit 28 formed in this way is put into the cylinder 26 in which the spherical valve body 30 is arranged between the second cylinder 54 of the cylinder 26 and the mounting cylinder 56. The spherical valve body 30 is formed as a sphere made of, for example, a metal material or a resin material. The outer diameter of the sphere of the spherical valve body 30 is larger than the inner diameter of the mounting cylinder 56. The outer diameter of the sphere of the spherical valve body 30 is smaller than the inner diameter of the second cylinder 54 and the outer diameter of the flange portion 184 of the plug 112.

The dimensions of the inner rod 110 and the plug 112 will be illustrated. The dimensions of the inner rod 110 and the plug 112 can vary depending on the size of the pump body 3.
The total length of the inner rod 110 is, for example, 39 mm. The first shaft portion 172 is, for example, 10 mm, the second shaft portion 174 is, for example, 20 mm, and the shaft diameter changing portion 176 is, for example, 1.5 mm.
The total length of the plug 112 is, for example, 25 mm. The outer diameter of the plug 112 is, for example, 7.4 mm. The outer diameter of the flange portion 184 of the plug 112 is, for example, 10 mm. The length of the liquid passage (flow path) 186 of the plug 112 is, for example, 10 mm.

The outer diameter of the second shaft portion 174 of the shaft body 162 of the inner rod 110 is, for example, 2.5 mm. The distance between the tops of the pair of protrusions 178 is, for example, 2.6 mm. The outer diameter of the engaging portion 166 of the inner rod 110 is, for example, 2.6 mm.
The inner diameter of the annular portion 182 of the plug 112 is, for example, 2.5 mm. The inner diameter of the inner peripheral surface 112a between the annular portion 182 and the flange portion 184 of the plug 112 is, for example, 3.0 mm. The distance between the convex portion 188 of the plug 112 and the axis of the plug 112 is between 2.5 mm / 2 (= 1.25 mm) and 3.0 mm / 2 (= 1.5 mm).

The outer diameter (2.6 mm) of the engaging portion 166 of the inner rod 110 is larger than the inner diameter (2.5 mm) of the annular portion 182 of the plug 112. Therefore, the engaging portion 166 of the inner rod 110 does not easily pass through the annular portion 182 of the plug 112.

Here, the radius (2.6 mm / 2 = 1.3 mm) of the engaging portion 166 of the inner rod 110 is the distance between the convex portion 188 of the plug 112 and the axial center of the plug 112 (1.25 mm and 1. Distance between 5mm). In the present embodiment, considering the radius (1.3 mm) of the engaging portion 166 of the inner rod 110, the distances between the convex portion 188 of the plug 112 and the axial center of the plug 112 are 1.3 mm and 1.5 mm. It is preferable that it is between and.

The distance between the tops of the pair of protrusions 178 of the inner rod 110 is, for example, 2.6 mm, which is slightly larger than the inner diameter of the ring portion 182 of the plug 112, which is 2.5 mm. Due to the elastic deformation of the second shaft portion 174 of the inner rod 110 and the annular portion 182 of the plug 112, the inner rod 110 and the plug 112 are provided with sliding resistance at the axial center of the inner rod 110 and the plug 112. It is relatively mobile along.

In the present embodiment, regardless of the size of the inner rod 110 and the plug 112, the distance between the tops of the protrusions 178 of the second shaft portion 174 of the shaft body 162 of the inner rod 110 is the annulus portion 182 of the plug 112. It is preferable that the size is large with respect to the inner diameter, but the difference in size is preferably in the range of 0 mm to 1 mm. The difference in size is more preferably in the range of 0 mm to 0.5 mm. The smaller the difference in size, the more the inner rod 110 is suppressed from the sliding resistance while suppressing the wobbling of the shaft body 162 of the inner rod 110 with respect to the inner peripheral surface of the annular portion 182 of the plug 112. Easy to move. Therefore, when the inner rod 110 is moved with respect to the plug 112, the shaft body 162 of the inner rod continues to guide the axial center of the inner rod 110 toward the central axis C by the annular portion 182 of the plug 112. Therefore, the axis of the inner rod 110 coincides with or approaches the central axis C.
In the present embodiment, regardless of the sizes of the inner rod 110 and the plug 112, the difference in diameter between the outer diameter of the engaging portion 166 of the inner rod 110 and the inner diameter of the annular portion 182 of the plug 112, the plug 112. The difference in diameter between the inner diameter of the annular portion 182 of the inner rod 110 and the outer diameter of the second shaft portion 174 of the shaft body 162 of the inner rod 110, and the outer diameter of the second shaft portion 174 of the shaft body 162 of the inner rod 110. The difference in diameter between the inner diameter of the convex portion 188 of the plug 112 and the inner diameter of the plug 112 is preferably in the range of 0 mm to 1 mm, and more preferably in the range of 0 mm to 0.5 mm.
When each clearance or the difference in size is within 1 mm, more preferably within 0.5 mm, the axial center of the inner rod 110 and the plug 112 is suppressed from deviating from the central axis C.

The cylinder 26 forms a liquid chamber 220 in a region including the central axis C, and forms an air chamber 210 in a region around the central axis C.

Next, an assembly method for assembling the pump body 3 configured as described above will be briefly described.
When assembling the pump body 3, the piston unit 28 shown in FIG. 6 is formed.

The engaging portion 166 of the inner rod 110 and the shaft body 162 are inserted into the tubular body 152 of the liquid piston 104, and the support ring 156 of the liquid piston 104 supports the upper end of the coil spring 192 of the urging member 114. The ring portion 182 of the plug 112 is inserted inside the coil spring 192 of the urging member 114. The outer diameter of the engaging portion 166 of the inner rod 110 is larger than the inner diameter of the annular portion 182 of the plug 112, but the inner rod 110 is fitted into the plug 112 by utilizing the elastic force of the inner rod 110 and the plug 112. .. The lower end of the coil spring 192 of the urging member 114 is supported by the flange portion 184 of the plug 112.

In this way, the liquid piston 104, the inner rod 110, the plug 112, and the coil spring 192 of the urging member 114 are unitized as a part of the piston unit 28.

Here, the coil spring 192 of the urging member 114 is shorter than the natural length, and the plug 112 is urged downward with respect to the liquid piston 104. Therefore, the engaging portion 166 of the inner rod 110 is urged downward by the annular portion 182 of the plug 112. At this time, the valve body 164 of the inner rod 110 is supported on the valve seat 154 of the liquid piston 104.

The protrusion (bead portion) 178 of the shaft body 162 of the inner rod 110 shown in FIG. 7C has a non-circular cross section orthogonal to the central axis C of the second shaft portion 174 of the shaft body 162. The protrusion 178 is used as a reinforcing portion for increasing the cross-sectional area of the second shaft portion 174. Even if a compressive force is applied along the axis of the inner rod 110, the second shaft portion 174 of the shaft body 162 of the inner rod 110 is less likely to be elastically deformed as compared with the case where the protrusion 178 is not present, and the inner rod 110 Deformation of the axis deviating from the central axis C is suppressed as much as possible.

At least three convex portions (bead portions) 188 provided on the inner peripheral surface 112a of the plug 112 shown in FIGS. 8 (D) to 8 (F) are smooth without the convex portion 188 on the inner peripheral surface 112a of the plug 112. It is used as a reinforcing portion that increases the cross-sectional area of the plug 112 as compared with the case where it is an inner peripheral surface. Therefore, even if a compressive force is applied along the axis of the plug 112, the plug 112 is less likely to be elastically deformed as compared with the case where the convex portion 188 does not exist, and the axis of the plug 112 is bent away from the central axis C. Is suppressed as much as possible.

As shown in FIG. 6, the annular auxiliary valve body 108 is fixed on the upper side of the inner fitting portion 134 of the air piston 102. An annular air chamber valve body 106 is fixed to the holding portion 124 of the air piston 102. The upper end of the liquid piston 104 is fitted to the inner fitting portion 134 of the fitting cylinder 126 of the air piston 102. In this way, the piston unit 28 is configured.

The spherical valve body 30 is inserted into the plug accommodating portion 74 of the second cylinder 54 of the cylinder 26 shown in FIGS. 1 to 5. In this state, the axis of the piston unit 28 is aligned with the axis of the cylinder 26, and the piston unit 28 is inserted into the cylinder 26. Specifically, the urging member 114, the plug 112, and the inner rod 110 are put into the second cylinder 54, and the tubular body portion 122 of the air piston 102 is brought into contact with the inner peripheral surface of the first cylinder 52 of the cylinder 26. While putting it in the first cylinder 52. Therefore, the spherical valve body 30 and the piston unit 28 are arranged in the cylinder 26.

At this time, the pump body 3 has an air chamber 210 between the lower side of the air piston 102, the lower side of the valve body 106 for the air chamber, the outside of the liquid piston 104, and the inside of the first cylinder 52 of the cylinder 26. To form. The pump body 3 forms a liquid chamber 220 between the inside of the second cylinder 54 of the cylinder 26 and the spherical valve body 30.

In this state, the fixing portion 64 of the cylinder 26 is fixed to the shoulder portion 36 of the supporting portion 22. With the mesh filter 48 arranged in the flow path 24a of the nozzle 24, the outer fitting portion 132 of the fitting cylinder 126 of the air piston 102 is fitted into the inner cylinder 42 of the nozzle 24. As shown in FIG. 2, the abutting portion 124a of the air piston 102 is guided or abutted by the shoulder portion 36 of the supporting portion 22.

The pump body 3 is assembled in this way.

Next, the operation of the discharge container 1 including the pump body 3 configured as described above will be described. The pipe body 4 is inserted into and fixed to the mounting cylinder 56 of the pump body 3. The female screw portion 34a of the container fixing cylinder 34 of the support portion 22 is fastened to the male screw portion 16 of the fixing portion 14 of the container body 2, and the discharge container 1 is assembled. Here, it is assumed that the liquid material 400 is stored in the container body 2 and the liquid material 400 exists in the liquid chamber 220, and an example in which the foamy liquid material 400 is discharged from the nozzle 24 of the pump body 3 will be described.

When the nozzle 24 is at the upper limit position (top dead center) shown in FIG. 2, the spherical valve body 30 is in contact with the valve seat 76a of the second annular portion 76 of the cylinder 26 and is closed. The outer annular valve body 142 of the air chamber valve body 106 comes into contact with the air piston 102 from below to prevent communication between the air chamber 210 and the through hole 102a. The inner annular valve body 144 of the air chamber valve body 106 comes into contact with the flange 158 of the liquid piston 104 from above, and prevents the air chamber 210 from communicating with the outside of the piston unit 28 through the through hole 102a of the air piston 102. The valve body 164 of the inner rod 110 is in contact with the valve seat 154 of the liquid piston 104. The auxiliary valve body 108 is in contact with the valve body 164 of the inner rod 110.

When the valve body 164 of the inner rod 110 is supported by the valve seat 154 of the liquid piston 104, the valve seat 154 supports the axial center of the inner rod 110 toward the central axis C. Therefore, the axial center of the inner rod 110 is aligned with or close to the central axis C at the upper end.

When the valve body 164 of the inner rod 110 is supported by the auxiliary valve body 108, the auxiliary valve body 108 supports the axial center of the inner rod 110 toward the central axis C. Therefore, the axial center of the inner rod 110 is aligned with or brought closer to the central axis C at the upper end in cooperation with the valve seat 154 of the liquid piston 104.

The plug 112 is housed in the second cylinder 54 of the cylinder 26, and the axis of the plug 112 coincides with or substantially coincides with the axis (central axis C) of the cylinder 26. The engaging portion 166 of the inner rod 110 is in contact with the annular portion 182 of the plug 112 from below and is supported. At this time, the protrusion 178 provided on the second shaft portion 174 of the shaft body 162 of the inner rod 110 is supported by the annular portion 182 of the plug 112. Therefore, the axial center of the inner rod 110 is aligned with or close to the central axis C at the lower end.

Therefore, the axes of the support portion 22, the nozzle 24, the cylinder 26, the air piston 102, the liquid piston 104, the inner rod 110, and the plug 112 coincide with or substantially coincide with the central axis C.

From this state, as shown in FIG. 3, when the user presses the nozzle 24 downward along the central axis C against the support portion 22, the air piston of the piston unit 28 opposes the urging force of the urging member 114. The 102 and the liquid piston 104 move downward along the central axis C. At this time, the air chamber 210 of the air piston 102 and the liquid chamber 220 of the liquid piston 104 are pressurized, and the spherical valve body 30 is pressurized downward. The engaging portion 166 of the inner rod 110 moves downward along the central axis C with respect to the annular portion 182 of the plug 112. The spherical valve body 30 is maintained in a closed state.

As the tubular body 152 of the liquid piston 104 moves downward, a gap is formed between the valve seat 154 of the liquid piston 104 and the valve body 164 of the inner rod 110. Similarly, a gap is formed between the auxiliary valve body 108 and the valve body 164 of the inner rod 110. Therefore, the liquid body 400 is between the outer peripheral surface of the shaft body 162 of the inner rod 110 and the inner peripheral surface of the tubular body 152 of the liquid piston 104, the valve body 164 of the inner rod 110 and the valve seat 154 of the liquid piston 104. It enters the mixing chamber 136 in the fitting cylinder 126 through the space.

The valve body 164 of the inner rod 110 is pressed downward by a plurality of ribs 136a formed inward in the mixing chamber 136 of the fitting cylinder 126 of the air piston 102. At this time, since each rib 136a is inclined from the side close to the auxiliary valve body 108 toward the central axis C toward the opening 138, when the valve body 164 of the inner rod 110 and the opening 138 are brought close to each other, The valve body 164 is guided toward the central axis C by the plurality of ribs 136a.

The outer annular valve body 142 of the air chamber valve body 106 is maintained in a closed state due to a pressure increase accompanying a decrease in volume in the air chamber 210. The inner annular valve body 144 of the air chamber valve body 106 opens due to a pressure increase in the air chamber 210. Therefore, the air in the air chamber 210 is between the outer peripheral surface of the tubular body 152 of the liquid piston 104 and the inner annular valve body 144 of the valve body 106 for the air chamber, the inner peripheral surface of the air piston 102 and the liquid piston 104. It enters the mixing chamber 136 through the outer peripheral surface of the tubular body 152 and between the valve body 164 of the inner rod 110 and the auxiliary valve body 108.

The liquid body 400 and air are mixed in the mixing chamber 136 in the fitting cylinder 126. The liquid body 400 mixed with air in the mixing chamber 136 passes through the mesh filter 48 in the discharge flow path 24a, and the liquid body 400 and the bubbles formed by the air are refined. Therefore, the liquid body 400 becomes foamy in the flow path 24a of the nozzle 24 and is discharged from the discharge cylinder 46 of the nozzle 24.

Here, FIG. 9 shows a schematic cross-sectional view orthogonal to the central axis C in a state where the inner rod 110 and the plug 112 are fitted. The inner rod 110 in FIG. 9 is a cross section of the second shaft portion 174 of the shaft body 162 of the inner rod 110 along the line 7C-7C in FIG. 7A. The plug 112 in FIG. 9 is a cross section taken along the line 8F-8F in FIG. 8 (B).

Due to the clearance between the vertices of the protrusion 178 of the shaft body 162 of the inner rod 110 and the inner diameter of the ring portion 182 of the plug 112, the protrusion 178 of the shaft body 162 of the inner rod 110 and the circle of the plug 112 A part of the ring portion 182 continues to be in contact. Therefore, when the shaft body 162 of the inner rod 110 moves relative to the annular portion 182 of the plug 112 along the central axis C, the protrusion 178 of the shaft body 162 of the inner rod 110 and the circle of the plug 112 Sliding resistance is imparted to and from the ring portion 182. Further, in the present embodiment, the outer diameter (φ2.5 mm) of the second shaft portion 174 excluding the protrusion 178 of the shaft body 162 of the inner rod 110 is the inner diameter (φ2.5 mm) of the annular portion 182 of the plug 112. Is almost the same as. Therefore, the axial deviation between the axial center of the inner rod 110 and the axial center of the plug 112 is suppressed.

In the present embodiment, considering the radius (1.3 mm) of the engaging portion 166 of the inner rod 110, the distances between the convex portion 188 of the plug 112 and the axial center of the plug 112 are 1.3 mm and 1.5 mm. Is between. Therefore, a state in which the clearance between the engaging portion 166 of the inner rod 110 and the convex portion 188 of the plug 112 is small is maintained. Therefore, even if the axial center of the inner rod 110 tries to deviate from the axial center of the plug 112, the engaging portion 166 of the inner rod 110 comes into contact with the convex portion 188 of the plug 112, so that the inner rod 110 The axial center is maintained in a state of being guided toward the central axis C by the annular portion 182 and the convex portion 188 of the plug 112.

Further, the protrusion 178 of the shaft body 162 of the inner rod 110 extends in parallel with the central axis C, and serves as a reinforcing bead that suppresses the shaft body 162 of the inner rod 110 from bending. The convex portion 188 of the plug 112 extends parallel to the central axis C and serves as a reinforcing bead that suppresses the plug 112 from bending. When the nozzle 24 is lowered from the upper limit position shown in FIG. 2 as shown in FIG. 3 and the foamy liquid body 400 is discharged from the nozzle 24, the axial center of the inner rod 110 and the axial center of the plug 112 are aligned. , The protruding portion 178 of the inner rod 110 and the convex portion 188 of the plug 112 maintain the state of being guided toward the central axis C. Therefore, it is possible to prevent the inner rod 110 and the plug 112 from being bent with respect to the axial center of the liquid piston 104, that is, the central axis C. Therefore, the inner rod 110 slides with respect to the plug 112 in a state where the axis coincides with or substantially coincides with the axis (central axis C) of the liquid piston 104.

The difference in diameter between the outer diameter of the engaging portion 166 of the inner rod 110 and the inner diameter of the annular portion 182 of the plug 112, the inner diameter of the annular portion 182 of the plug 112, and the shaft body 162 of the inner rod 110. The difference from the distance between the tops of the pair of protrusions 178 of the second shaft portion 174, the outer diameter of the second shaft portion 174 excluding the protrusion 178 of the shaft body 162 of the inner rod 110, and the protrusion of the plug 112. The difference in diameter between the inner diameter and the inner diameter of the portion 188 is preferably about 0 mm to 1 mm, preferably about 0 mm to 0.5 mm, respectively. In this case, the axial center of the inner rod 110 and the axial center of the plug 112 coincide with or substantially coincide with the central axis C while preventing the engaging portion 166 of the inner rod 110 from coming off from the annular portion 182 of the plug 112. Maintain the state.

Here, as shown in FIG. 3, the outer peripheral surface of the upper end portion of the tubular body 152 of the liquid piston 104 and the inner fitting portion 134 of the fitting cylinder 126 are symmetrical with respect to the central axis C, for example. Inside the fitting cylinder 126, a uniform air passage is formed in the circumferential direction toward the mixing chamber 136 above the tubular body 152 of the liquid piston 104. When the axis of the inner rod 110 slides off the axis of the liquid piston 104, the valve body 164 of the inner rod 110 is deviated from the axis of the liquid piston 104. At this time, the clearance between the valve seat 154 of the liquid piston 104 and the valve body 164 of the inner rod 110 becomes non-uniform in the circumferential direction with respect to the central axis C. When the liquid material 400 is put into the mixing chamber 136 through the gap between the valve body 164 of the inner rod 110 and the valve seat 154 of the liquid piston 104, the liquid passage is non-uniform even if the air passage is uniform. If this is the case, the bubbles discharged through the nozzle 24 may become inhomogeneous.

In the present embodiment, when the inner rod 110 is moved along the central axis C with respect to the plug 112, the axial center of the shaft body 162 of the inner rod 110 is changed to the axial center of the annular portion 182 of the plug 112 (central axis C). ) To match or substantially match. Further, in the present embodiment, when the inner rod 110 is moved along the axial center (central axis C) with respect to the plug 112, the second shaft portion 174 of the shaft body 162 of the inner rod 110 is three of the plug 112. The convex portion 188 is guided to maintain the centering state toward the central axis C. Therefore, it is possible to prevent the axial center of the valve body 164 of the inner rod 110 from being deviated from the axial center (central axis C) of the liquid piston 104. Therefore, the inner rod 110 forms a uniform liquid passage in the circumferential direction between the valve body 164 and the tubular body 152 of the liquid piston, and the fitting cylinder of the valve body 164 and the air piston 102. A uniform air passage is formed in the circumferential direction between the inner peripheral surface of 126 and the auxiliary valve body 108. Therefore, the pump body 3 of the discharge container 1 according to the present embodiment makes the liquid material 400 as uniform as possible in foam form, and discharges the liquid material 400 as as homogeneous as possible from the discharge cylinder 46 of the nozzle 24.

When the nozzle 24 is pushed down most as shown in FIG. 4 and the nozzle 24 is at the lower limit position (bottom dead center) where the nozzle 24 abuts on the nozzle guide cylinder 32 of the support portion 22, the shaft diameter changing portion of the shaft body 162 of the inner rod 110 Since the maximum diameter of 176 (for example, 3.1 mm) is larger than the inner diameter of the ring portion 182 (for example, 2.5 mm), it is caught by the ring portion 182. Therefore, the inner rod 110 is restricted from moving downward with respect to the cylinder 26 and the plug 112. The spherical valve body 30 is maintained in a closed state. The outer annular valve body 142 of the air chamber valve body 106 remains closed, and the inner annular valve body 144 is cylinderd through the gravity of the inner annular valve body 144 and the through hole 62b of the first cylinder 52 of the cylinder 26. It is closed by the air introduced in 26.

When the nozzle 24 is released from the state where the nozzle 24 is pushed down most as shown in FIG. 5, the liquid piston 104, the air piston 102, and the nozzle 24 rise along the central axis C due to the urging force of the urging member 114. At this time, the valve seat 154 of the liquid piston 104 comes into contact with the valve body 164 of the inner rod 110. Similarly, the valve body 164 of the inner rod 110 comes into contact with the auxiliary valve body 108. Therefore, the valve seat 154 of the liquid piston 104 is closed with respect to the valve body 164 of the inner rod 110, and the auxiliary valve body 108 is closed with respect to the valve body 164 of the inner rod 110.

After that, the liquid piston 104, the air piston 102, the nozzle 24, and the inner rod 110 rise together with respect to the support portion 22. At this time, the volumes of the air chamber 210 and the liquid chamber 220 become large, and the inside of the air chamber 210 and the inside of the liquid chamber 220 become negative pressures, respectively. Therefore, the outer annular valve body 142 of the air chamber valve body 106 opens, and the air introduced through the through hole 62b of the cylinder 26 enters the air chamber 210. The spherical valve body 30 rises with respect to the valve seat 76a of the second annular portion 76 of the second cylinder 54 of the cylinder 26, and the liquid body 400 enters the liquid chamber 220 under negative pressure through the pipe body 4. Therefore, while the nozzle 24 moves from the lower limit position to the upper limit position, air is sucked into the air chamber 210 and the liquid material 400 is sucked into the liquid chamber 220. The liquid body 400 passes not only the inside of the plug 112 but also the outer peripheral surface of the plug 112 and the second cylinder of the cylinder 26 through the tube body 4, the mounting cylinder 56, the inside of the flange portion 184 of the plug 112, and the liquid passage 186 of the plug 112. It flows between the inside of 54.

When the engaging portion 166 of the inner rod 110 and the annular portion 182 of the plug 112 are engaged, the nozzle 24 is stopped from rising and returns to the state shown in FIG.

The discharge container 1 is formed into a foam shape when the pump body 3 presses the liquid body 400 in the container body 2 downward as shown in FIG. 3 by a series of operations shown in FIGS. 2 to 5. The liquid material 400 is sucked into the liquid chamber 220 when the liquid is discharged and moved upward according to the urging force of the urging member 114 as shown in FIG.

Here, in FIG. 10, the resin type and flexural modulus Ea of the inner rod 110 are shown for the pump bodies (pump dispensers) 3 of three types A (medium), B (small), and C (large) having different sizes. (MPa), the resin type of the plug 112, and the flexural modulus Eb (MPa) are shown. The type A inner rod 110 and the type A plug 112 are fitted and become a part of the type A pump body 3. The type B inner rod 110 and the type B plug 112 are fitted and become a part of the type B pump body 3. The type C inner rod 110 and the type C plug 112 are fitted and become a part of the type C pump body 3.
As an example, polypropylene (PP) or polyacetal (POM) is used for the inner rod 110. As an example, polypropylene (PP) is used for the plug 112. When polypropylene is used for the inner rod 110 and the plug 112, the flexural modulus Ea (= 1100 MPa) of the inner rod 110 and the flexural modulus Eb (= 1100 MPa) of the plug 112 are determined by JIS K 6921-2 (ISO 19069-2: It was measured according to 2016). When polyacetal (POM) was used for the inner rod 110, the flexural modulus Ea (= 2500 MPa) of the inner rod 110 was measured in accordance with JIS K 6921-2 (ISO 19069-2: 2016).

FIG. 11 shows the moldability according to the flexural modulus Ea of the inner rod 110 and the flexural modulus Eb of the plug 112, the suitability for incorporating the inner rod 110 and the plug 112, and the inner rod 110 and the plug during operation of the pump body 3. The magnitude of the deviation from the axis of 112 is shown.
It is a preferable embodiment that the case of 1000 ≦ Eb ≦ Ea is applied to the pump body 3 according to the present embodiment. In the case of the embodiment, the inner rod 110 and the plug 112 are made of a resin material such as polypropylene or polyacetal to obtain good moldability. In the case of the embodiment, the inner rod 110 and the plug 112 can suppress bending due to sliding with each other. When the rigidity of the inner rod 110 is higher than the rigidity of the plug 112, the annular portion 182 of the plug 112 is deformed along the outer shape of the protrusion 178 of the inner rod 110. At this time, the protruding portion 178 of the inner rod 110 and the annular portion 182 of the plug 112 are not in point contact but in line contact. Therefore, the protruding portion 178 of the inner rod 110 obtains a high sliding resistance with respect to the annular portion 182 of the plug 112. Therefore, when 1000 ≦ Eb ≦ Ea and the rigidity of the inner rod 110 is higher than the rigidity of the plug 112 as in the embodiment, the inner rod 110 is deformed by the plug 112 after the inner rod 110 is incorporated into the plug 112. Suppress that. Therefore, the inner rod 110 and the plug 112 have good fitting suitability for each other. Then, in the case of the embodiment, the deviation of the axial centers of the inner rod 110 and the plug 112 is suppressed.

The case of 1000 ≦ Ea <Eb is referred to as Comparative Example 1. When 1000 ≦ Ea <Eb and the rigidity of the plug 112 is higher than the rigidity of the inner rod 110, the annular portion 182 of the plug 112 does not deform with respect to the protrusion 178 of the inner rod 110, and maintains a perfect circle, for example. To do. Therefore, the protrusion 178 of the inner rod 110 and the annular portion 182 of the plug 112 are in point contact, and it is difficult to obtain a higher sliding resistance as compared with the case of the embodiment (1000 ≦ Eb ≦ Ea). Therefore, when 1000 ≦ Ea <Eb and the rigidity of the plug 112 is higher than the rigidity of the inner rod 110, the inner rod 110 is likely to be deformed by the plug 112 after the inner rod 110 is incorporated into the plug 112. The suitability for incorporating the inner rod 110 and the plug 112 into each other is poor.

Comparative Example 2 is a case where 1000> Ea and 1000> Eb. In the case of Comparative Example 2, it is difficult to mold the two parts of the inner rod 110 and the plug 112 so as to be along the respective axes with high dimensional accuracy. Therefore, in the case of Comparative Example 2, the suitability for incorporating the inner rod 110 and the plug 112 into each other is poor. Further, in the case of Comparative Example 2, there is a high possibility that the inner rod 110 and the plug 112 are bent due to the sliding operation when the liquid material 400 is discharged, and it is difficult to suppress the deviation from the mutual axis.

Therefore, as shown in FIG. 10, the flexural modulus Ea (MPa) of the inner rod 110 and the flexural modulus of the plug 112 when measured in accordance with JIS K 6921-2 (ISO 19069-2: 2016). It is preferable that Eb (MPa) is composed of a resin of 1000 ≦ Eb ≦ Ea, as shown in FIG. 11 as an example.

The polypropylene (PP) or polyacetal (POM) which is the material of the inner rod 110 shown in FIG. 10 is an example, and an appropriate material is used depending on the type of the liquid material 400. Similarly, polypropylene (PP), which is the material of the plug 112 shown in FIG. 10, is an example, and an appropriate material is used depending on the type of the liquid material 400.

As described above, according to the pump body 3 according to the present embodiment, the following can be said.

At least three convex portions 188 protruding toward the axial center (central axis C) of the plug 112 are formed on the inner peripheral surface of the tubular plug 112 so as to be separated from the axial center in the circumferential direction. At least three protrusions 188 reinforce the compressive strength of the plug 112. Therefore, when the nozzle 24 is moved from the position shown in FIG. 2 to the position shown in FIG. 3 with respect to the support portion 22 and the foamed liquid body 400 is discharged from the nozzle 24, the inner is strengthened by the strength reinforcement by the convex portion 188. Even with the load of the rod 110 and the urging member 114, the axis of the plug 112 is suppressed from being displaced from the central axis C due to elastic deformation, and the axis of the plug 112 is maintained in a state of being aligned with or substantially aligned with the central axis C. can do. Therefore, according to the present embodiment, it is possible to provide the inner rod 110, the pump body (pump dispenser) 3 capable of suppressing the axial center of the plug 112 from deviating from the central axis C, and the discharge container 1. it can.

The second shaft portion 174 of the shaft body 162 of the inner rod 110 is formed with, for example, a plurality of protrusions 178 extending parallel to the axis of the inner rod 110. The plurality of protrusions 178 reinforce the compressive strength of the inner rod 110. Therefore, when the inner rod 110 moves with respect to the plug 112, the inner rod 110 is suppressed from being elastically deformed. In the present embodiment, the protrusions 178 are a pair and are on opposite sides of the inner rod 110 with the axial center (central axis C). Due to the movement along the axis (central axis C) of the inner rod 110 with respect to the plug 112, the pair of protrusions 178 of the second shaft portion 174 of the shaft body 162 of the inner rod 110 is formed by the circular ring portion 182 of the plug 112. Slide between and. Therefore, the clearance between the protrusion 178 of the shaft body 162 of the inner rod 110 and the ring portion 182 is the clearance between the second shaft portion 174 and the ring portion 182 without the protrusion 178 of the shaft body 162 of the inner rod 110. Less than the clearance between. The distance between the tops of the protrusions 178 of the shaft body 162 of the inner rod 110 and the annulus 182 is larger than the distance between the tops of the protrusions 178, and the difference in size is, for example, 1 mm or less. Is preferable. It is more preferable that the difference in size between the tops of the protrusions 178 of the shaft body 162 of the inner rod 110 and the annular portion 182 is 0.5 mm or less. Therefore, the protrusion 178 of the shaft body 162 of the inner rod 110 is maintained in a sliding state with respect to the annular portion 182 of the plug 112, and the inner rod 110 is prevented from swaying with respect to the axial center of the plug 112. be able to. Therefore, when the liquid body 400 passes between the inside of the valve seat 154 of the tubular body 152 of the liquid piston 104 and the valve body 164 of the inner rod 110, and when the valve body 164 of the inner rod 110 and the air piston 102 are fitted. When passing between the inside of the combined cylinder 126, the bias of the clearance is suppressed. Further, in a state where the liquid piston 104 is fitted to the air piston 102 and the axis of the air piston 102 and the liquid piston 104 coincides with or substantially coincides with the central axis C, air is outside the tubular body 152 of the liquid piston 104. Passes between and the inside of the fitting cylinder 126 of the air piston 102. Therefore, the deviation of the clearance between the valve body 164 of the inner rod 110 and the inside of the fitting cylinder 126 is suppressed. Therefore, when the amount of the liquid body 400 and the amount of air are put into the mixing chamber 136 through the outside of the valve body 164 of the inner rod 110, the bias of the gap around the central axis C is suppressed. Therefore, according to the present embodiment, it is possible to provide the pump body 3 capable of suppressing the axial center of the inner rod 110 and the plug 112 from deviating from the central axis C. By using such a pump body 3, when air is mixed with the liquid material 400 to form bubbles, a homogeneous foam can be formed. Therefore, according to the present embodiment, it is possible to provide the inner rod 110, the pump body (pump dispenser) 3 capable of suppressing the axial center of the plug 112 from deviating from the central axis C, and the discharge container 1. it can.

When the inner rod 110 moves relative to the plug 112 by the convex portion 188 on the lower side of the annular portion 182 of the plug 112, the engaging portion 166 of the inner rod 110 is moved to the axial center (central axis C) of the plug 112. ). Therefore, the inner rod 110 and the plug 112 guide each other toward the central axis C at the annular portion 182 of the plug 112 and the engaging portion 166 of the inner rod 110. When the engaging portion 166 of the inner rod 110 moves downward and separates from the annular portion 182 of the plug 112 and the foamy liquid body 400 is discharged from the nozzle 24, the annular portion 182 of the plug 112, The larger the distance between the inner rod 110 and the engaging portion 166, the easier it is to guide each other toward the central axis C. Therefore, the axial centers of the plug 112 and the inner rod 110 can be maintained in a state of being aligned with or substantially aligned with the central axis C.
The clearance between the convex portions 188 extending parallel to the central axis C and arranged at equal intervals in the circumferential direction and the engaging portion 166 of the inner rod 110 is maintained in a small state such as 1 mm or less. It is more preferable that the clearance is 0.5 mm or less.

The annular portion 182 of the plug 112 supports the second shaft portion 174 of the inner rod 110, and as the distance between the engaging portion 166 of the inner rod 110 and the annular portion 182 of the plug 112 increases, the protrusion of the plug 112 The portion 188 attempts to guide the shaft body 162 and the engaging portion 166 of the inner rod 110 to the central axis C. Therefore, when the liquid body 400 passes between the inside of the valve seat 154 of the tubular body 152 of the liquid piston 104 and the valve body 164 of the inner rod 110, and when the valve body 164 of the inner rod 110 and the air piston 102 are fitted. When passing between the inside of the combined cylinder 126, the bias of the clearance is suppressed. Further, air passes between the outside of the tubular body of the liquid piston 104 and the inside of the fitting cylinder 126 of the air piston 102, and the clearance between the valve body 164 of the inner rod 110 and the inside of the fitting cylinder 126 is biased. Suppress. Therefore, when the amount of the liquid body 400 and the amount of air are put into the mixing chamber 136 through the outside of the valve body 164 of the inner rod 110, the bias is suppressed. Therefore, according to the present embodiment, it is possible to provide the pump body 3 capable of suppressing the axial center of the inner rod 110 and the plug 112 from deviating from the central axis C. By using such a pump body 3, when air is mixed with the liquid material 400 to form bubbles, a homogeneous foam can be formed.

By appropriately setting the flexural modulus Ea of the inner rod 110 of the pump body 3 and the flexural modulus Eb of the plug 112 as in the embodiment shown in FIG. 11, the inner rod 110 and the plug 112 are bent due to sliding. It is possible to suppress the deviation of the inner rod 110 and the plug 112 from the axis. Further, by making the rigidity of the inner rod 110 higher than the rigidity of the plug 112, it is possible to prevent the inner rod 110 from being deformed after the inner rod 110 is incorporated into the plug 112, that is, to prevent the inner rod 110 from bending. be able to.

A modified example of the pump bodies 3 of each type A, B, and C will be described with reference to FIG. Here, the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 excluding the convex portion 188 is set to 0.5 mm. That is, it is assumed that the outer diameter of the engaging portion 166 of the inner rod 110 is 1 mm smaller than the inner diameter of the inner peripheral surface 112a of the plug 112 (excluding the convex portion 188).

In the above example, the inner diameter of the inner peripheral surface 112a of the plug 112 is 3.0 mm, and the outer diameter of the engaging portion 166 of the inner rod 110 is 2.6 mm. Therefore, the diameter difference between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 is 0.4 mm, and the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 ( Clearance) is 0.2 mm. The gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 depends on the amount of protrusion of the convex portion 188 with respect to the inner peripheral surface 112a of the plug 112. Therefore, depending on the size of the convex portion 188, the size of the gap may be smaller than 0.2 mm, such as 0.1 mm.

For example, if the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 is set to be appropriately small, such as 0.2 mm, the wall thickness of the plug 112 can be increased and the rigidity of the plug 112 can be increased. Can be made larger. In this case, it is necessary to prevent the axial center of the plug 112 and the axial center of the inner rod 110 from deviating from the central axis C under the normal pressing pressure on the nozzle 24 and the viscosity of the normal liquid body 400 (appropriately low viscosity). Can be done.

For example, when the pressing pressure on the nozzle 24 is increased to increase the downward stroke speed along the central axis C of the nozzle 24, the viscosity of the liquid body 400 increases due to changes over time, or the liquid has an appropriately high viscosity. When the engaging portion 166 of the inner rod 110 is moved in the plug 112, such as when the body 400 is discharged, the viscous resistance of the liquid body 400 may become relatively high.

When the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 other than the convex portion 188 of the plug 112 is appropriately narrow, for example, smaller than 0.5 mm, the liquid material 400 determines the viscosity. May increase the viscous resistance when the inner rod 110 moves with respect to the plug 112. In such a case, the movement (sliding) of the engaging portion 166 of the inner rod 110 inside the plug 112 becomes unstable, and when the inner rod 110 moves, the axis of the inner rod 110 may deviate from the central axis C. There is sex.

Here, as shown in FIG. 12, the nozzle 24 is pushed down along the central axis C in the case where the B-type viscosity of the liquid material 400 is 10 mPa · s, 50 mPa · s, 10000 mPa · s, and 300,000 mPa · s. It worked. The temperature of the liquid body 400 is 20 ° C.
The viscosity of the liquid body 400 was measured with a B-type viscometer. For the measurement of the B-type viscometer, select an appropriate rotor or spindle according to the dosage and viscosity of the liquid material 400, and rotate the rotor or spindle at the corresponding rotation speed (50 to 60 rotations / minute). The viscosity was measured when the rotation time was 60 seconds.

When the B-type viscosity of the liquid material 400 is, for example, 10 mPa · s, it can be said that the viscosity of the liquid material 400 is low. In this case, even if the stroke speed of the nozzle 24 is increased, the inner rod 110 and the plug 112 are not easily affected by the viscosity of the liquid body 400 regardless of the stroke speed. Therefore, regardless of the stroke speed of the nozzle 24, the axial centers of the inner rod 110 and the plug 112 can easily maintain a state along the central axis C.
When the B-type viscosity of the liquid body 400 is 10 mPa · s, the inner rod 110 and the plug 112 are not easily affected by the viscosity of the liquid body 400. Therefore, of the engaging portion 166 and the plug 112 of the inner rod 110, the convex portion It is also preferable that the gap with the inner peripheral surface 112a excluding 188 is smaller than 0.5 mm, such as 0.2 mm as in the above example.

When the B-type viscosity of the liquid material 400 is increased from, for example, 10 mPa · s, it is assumed that it becomes difficult to move the nozzle 24 downward along the central axis C as the viscosity increases. If it becomes difficult to move the nozzle 24, it is assumed that it becomes difficult for the air and the liquid body 400 to mix.

In this modification, the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 is set to 0.5 mm and appropriately increased. Therefore, for example, when the B-type viscosity of the liquid body 400 is 50 mPa · s or 10000 mPa · s, when the nozzle 24 is pressed downward along the central axis C, it becomes with the engaging portion 166 of the inner rod 110. It is possible to suppress an increase in non-contact sliding resistance (viscous resistance) between the plug 112 and the inner peripheral surface 112a. Therefore, it is possible to prevent the movement (sliding) of the engaging portion 166 of the inner rod 110 with respect to the plug 112 from becoming unstable. Therefore, for example, even when the B-type viscosity of the liquid material 400 is 50 mPa · s or 10000 mPa · s, the liquid material 400 can be appropriately mixed with air, and the liquid material discharged from the nozzle 24 can be appropriately mixed. 400 becomes a homogeneous foam.

As in this modification, the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 is set to 0.5 mm or more and appropriately increased, so that the B-type viscosity of the liquid body 400 is 10,000 mPa · s. The liquid material 400 can be appropriately mixed with air even when the viscosity exceeds, for example, 50,000 mPa · s, and the liquid material 400 discharged from the nozzle 24 is a homogeneous foam. It is expected to be like this.

On the other hand, in this modified example, in the case where the B-type viscosity of the liquid material 400 is 300,000 mPa · s, an operation of moving the nozzle 24 downward along the central axis C is performed. In this case, the viscosity of the liquid material 400 is too high, and it is difficult to move the nozzle 24. Even if the nozzle 24 is moved, the liquid material 400 is difficult to move, and the liquid material 400 is appropriately mixed with air in the mixing chamber 136. I couldn't. Therefore, if the B-type viscosity of the liquid material 400 is too high, the liquid material 400 is discharged from the nozzle 24 even if the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 is 0.5 mm or more. It can be difficult to get it done.

On the other hand, there is no problem even when the lower limit of the B-type viscosity of the liquid material 400 is a low viscosity such as 20 mPa · s or less such as 10 mPa · s.

According to the pump body 3 of this modification, even when the viscosity of the liquid body 400 becomes relatively high, the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 (excluding the convex portion 188) By setting the gap to an appropriate value such as 0.5 mm or more, it is possible to suppress the bending due to the sliding of the inner rod 110 and the plug 112, and it is possible to suppress the deviation of the axis from the central axis C. .. Even when the viscosity of the liquid body 400 becomes relatively high, the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a (excluding the convex portion 188) of the plug 112 is set to 0.5 mm or more. Non-contact sliding resistance (viscous resistance) between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 can be suppressed. Therefore, the inner rod 110 can be stably slid with respect to the plug 112. That is, it is possible to prevent unstable sliding of the engaging portion 166 of the inner rod 110 with respect to the plug 112.

As an example, when the gap between the engaging portion 166 of the inner rod 110 and the inner peripheral surface 112a of the plug 112 is 0.5 mm or more, the liquid body 400 having a B-type viscosity of 10 to 50,000 mPa · s. Is used. In this case, it is possible to prevent the inner rod 110 and the plug 112 from being displaced from the central axis C when the nozzle 24 is appropriately moved downward along the central axis C.

Some modifications of the protrusion 178 of the second shaft portion 174 of the shaft body 162 of the inner rod 110 and the convex portion 188 of the plug 112 will be illustrated with reference to FIGS. 13 (A) to 13 (E). ..

13 (A) to 13 (E) show a modified example of the shaft body 162 of the inner rod 110 shown in FIG. 9 in a fitted state of the second shaft portion 174 and the plug 112. As shown in FIGS. 13 (A) to 13 (E), the shape of the second shaft portion 174 of the shaft body 162 of the inner rod 110 and the shape of the inner peripheral surface of the plug 112 are appropriately changed.

In the example shown in FIG. 13 (A), the second shaft portion 174 of the shaft body 162 of the inner rod 110 has three protrusions 178. In this case, the inner rod 110 is not axisymmetric with respect to the central axis C. The protrusions 178 are evenly spaced in the circumferential direction with respect to the central axis C. The distance between the central axis C and the top of the protrusion 178 is larger than the radius of the second shaft portion 174 not including the protrusion 178.

In the example shown in FIG. 13B, the cross section of the second shaft portion 174 of the shaft body 162 of the inner rod 110 is substantially elliptical. The protrusion 178 is formed as part of an ellipse.

The example shown in FIG. 13C has three convex portions 188 on the inner peripheral surface of the plug 112. The convex portions 188 are evenly spaced in the circumferential direction with respect to the central axis C.

The example shown in FIG. 13D has three convex portions 188 on the inner peripheral surface of the plug 112. The space inside the inner peripheral surface of the plug 112 is substantially triangular with the vertices of the triangle formed as part of the arc. The convex portions 188 are evenly spaced in the circumferential direction with respect to the central axis C. The convex portion 188 is formed into various shapes as long as the distance from the central axis C to the inner peripheral surface of the plug 112 can be reduced.

The plug 112 of the example shown in FIG. 13 (E) is the same as the example shown in FIG. 13 (D). The outer peripheral surface of the second shaft portion 174 of the shaft body 162 of the inner rod 110 is formed as a string with a part of its circumference cut off. The cross section of the shaft body 162 of the inner rod 110 has a substantially triangular shape in which the apex of the triangle is formed as a part of the arc. In this case, the outer portion of the shaft body 162 is the protrusion 178 with respect to the inscribed circle of the cross section of the second shaft portion 174.

As described above, the cross-sectional shape of the second shaft portion 174 of the shaft body 162 of the inner rod 110 can be appropriately set. The number of protrusions 178 of the second shaft portion 174 of the shaft body 162 of the inner rod 110 can be appropriately set as long as it is two or more. Further, the shape of the convex portion 188 on the inner peripheral surface of the plug 112 can be appropriately set. The number of convex portions 188 on the inner peripheral surface of the plug 112 can be appropriately set as long as it is three or more.

The tubular body 4 is not always necessary as long as the mounting cylinder 56 of the cylinder 26 extends downward long and is in a state of being close to or in contact with the bottom surface of the container body 2. In this case, the discharge container 1 has a pump body 3 and a container body 2 that can be attached to and detached from the support portion 22 of the pump body 3.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent requirements are deleted can be extracted as an invention.

3 ... Pump body, 22 ... Support, 24 ... Nozzle, 24a ... Discharge flow path, 26 ... Cylinder, 28 ... Piston unit, 30 ... Spherical valve body, 52 ... 1st cylinder, 54 ... 2nd cylinder, 56 ... Mounting Cylinder, 62 ... 1st sliding part, 64 ... fixed part, 66 ... annular part, 72 ... 2nd sliding part, 74 ... plug accommodating part, 76 ... annular part, 76a ... valve seat, 102 ... air piston , 104 ... liquid piston, 106 ... air chamber valve body, 108 ... auxiliary valve body, 110 ... inner rod, 112 ... plug, 114 ... urging member, 122 ... body, 124 ... holding part, 124a ... abutting part , 126 ... Fitting cylinder, 132 ... Outer fitting part, 134 ... Inner fitting part, 136 ... Mixing chamber, 138 ... Opening, 142 ... Outer annular valve body, 144 ... Inner annular valve body, 152 ... Cylindrical body, 154 ... Valve seat, 156 ... Support ring, 158 ... Flange, 162 ... Shaft body, 164 ... Valve body, 166 ... Engagement part, 172 ... First shaft part, 174 ... Second shaft part, 176 ... Shaft diameter change part 178 ... protrusion, 182 ... annulus, 184 ... flange, 186 ... liquid passage, 188 ... convex, 210 ... air chamber, 220 ... liquid chamber.

Claims (11)

A support part that is tubular and has a central axis defined,
A nozzle having a discharge cylinder and reciprocating between a first position and a second position different from the first position along the central axis with respect to the support portion.
A tubular cylinder supported by the support portion, forming a liquid chamber in a region including the central shaft, and forming an air chamber around the central shaft.
A cylindrical air piston supported by the nozzle and moving in the cylinder along the central axis according to the reciprocating motion of the nozzle to change the volume of the air chamber.
Inside the air piston, it is arranged between the cylinder and the air piston to form a part of the cylinder and the liquid chamber, and the air piston follows the reciprocating motion of the nozzle along the central axis. A cylindrical liquid piston that changes the volume of the liquid chamber and forms a mixing chamber between the air piston and the air in the air chamber and the liquid material in the liquid chamber.
An inner rod that is inserted into the inside of the liquid piston and moves along the axis with the reciprocating movement of the nozzle.
A tubular plug housed in the liquid chamber of the cylinder and defining a movement range of the inner rod in which the inner rod moves with respect to the cylinder along the axis of the inner rod.
Provided around the plug, one end is supported by the liquid piston and the other end is supported by the plug, and an urging member for separating the plug from the liquid piston is provided.
The plug has at least three convex portions on its inner peripheral surface that are spaced apart in the circumferential direction and project toward the axial center of the plug.
A pump dispenser in which the at least three protrusions extend parallel to the axis of the plug. The pump dispenser according to claim 1, wherein the at least three convex portions are equidistant from the axial center of the plug in the circumferential direction. The pump dispenser according to claim 1, wherein the at least three convex portions have the same shape and the same size. The at least three convex portions guide the axial center of the inner rod toward the axial center of the plug when the inner rod moves along the axial center of the inner rod. Pump dispenser described in. The inner rod
A shaft body that extends along the axis and is movable with respect to the inner peripheral surface of the plug.
It has an engaging portion that protrudes radially outward from the shaft body with respect to the shaft center.
The plug has an annular portion to which the engaging portion is engaged when the nozzle is in the first position.
The pump dispenser according to claim 1, wherein the at least three convex portions are provided at positions separated from the nozzle by the annular portion. The outer diameter of the engaging portion of the inner rod is larger than the inner diameter of the annular portion of the plug.
The inner diameter of the annular portion of the plug is substantially the same as the outer diameter of the shaft body of the inner rod.
The pump dispenser according to claim 5, wherein the outer diameter of the shaft body of the inner rod is smaller than the inner diameter of the at least three convex portions of the plug. The difference in diameter between the outer diameter of the engaging portion of the inner rod and the inner diameter of the annular portion of the plug, the inner diameter of the annular portion of the plug, and the outer diameter of the shaft body of the inner rod. The difference in diameter between the inner rod and the outer diameter of the shaft body of the inner rod and the inner diameter of the at least three convex portions of the plug are in the range of 0 mm to 1 mm, respectively. The pump dispenser according to claim 6. The clearance between the outer diameter of the engaging portion of the inner rod and the inner diameter of the annular portion of the plug, the inner diameter of the annular portion of the plug, and the outer diameter of the shaft body of the inner rod. The clearance between the outer diameter of the shaft body of the inner rod and the inner diameter of the at least three convex portions of the plug are in the range of 0 mm to 0.5 mm, respectively, according to claim 6. The pump dispenser described. The pump dispenser according to claim 5, wherein the gap between the engaging portion of the inner rod and the region between the convex portions separated in the circumferential direction of the inner peripheral surface of the plug is 0.2 mm or more. .. When a liquid having a B-type viscosity of 10 mPa · s to 50,000 mPa · s is used, the engaging portion of the inner rod and the region between the convex portions separated from each other in the circumferential direction of the inner peripheral surface of the plug. The pump dispenser according to claim 5, wherein the gap between the pump dispensers is 0.5 mm or more. The pump dispenser according to claim 1 and
A discharge container having a removable container body on the support portion of the pump dispenser.