JP6277030B2 - pump - Google Patents

Description

  The present invention relates to a pump.

Conventionally, for example, as shown in Patent Document 1 below, a stem erected so as to be able to move downward in an upwardly biased state, and an insertion hole through which the stem is vertically movable are formed, and A mounting cap mounted on the mouth, a piston linked to the stem, and a cylinder fitted with the piston so as to be slidable in the vertical direction. A pump is known in which the contents in the container body flow into the cylinder as the piston flows into the cylinder and the piston moves upward relative to the cylinder.
The piston is provided with an outer cylinder formed with a seal part (upper seal part) and a lower seal part that are in sliding contact with the inner peripheral surface of the cylinder, and is introduced into a portion of the cylinder located between the seal part and the lower seal part. A hole is formed. Further, an introduction passage is formed between the stem and the insertion hole to communicate the outside and the introduction hole when the piston is lowered.
And after discharge of the contents, when the contents in the container main body flow into the cylinder as the piston moves upward with respect to the cylinder, outside air flows into the container main body through the introduction passage and the introduction hole.

JP 2003-120547 A

  However, in the conventional pump, the communication between the introduction hole and the introduction passage is blocked by the piston during standby when the stem is positioned at the ascending end position in the state where it is mounted on the container body. In the case of a decrease, or when the contents permeate the container body toward the outside, the container body may be depressurized and deformed.

  The present invention has been made in view of such circumstances, and provides a pump capable of preventing the container body from being deformed by being decompressed and deformed in a standby state when mounted on the container body. Objective.

In order to solve the above-described problems and achieve such an object, the pump of the present invention includes a stem that is erected in a downwardly movable state in an upwardly biased state, and an insertion through which the stem is inserted so as to be movable up and down. A mounting cap mounted on the mouth of the container main body, a piston linked to the stem, and a cylinder fitted with the piston so as to be slidable in the vertical direction. A pump in which contents in the cylinder flow into the stem as the cylinder moves downward, and contents in the container body flow into the cylinder as the piston moves up with respect to the cylinder. The piston includes an outer cylinder having a seal portion formed in sliding contact with the inner peripheral surface of the cylinder, the piston facing the outer peripheral surface of the outer cylinder, and the seal An introduction hole is formed in a portion located below the part, and an introduction passage is formed between the stem and the insertion hole to communicate the outside and the inner peripheral surface side of the outer cylinder. And at least the outer cylinder of the cylinder is formed with a communication passage that communicates the introduction hole and the introduction passage, and the mounting cap has the pressing head positioned at a lower end position. In addition, a sealing cylinder for closing the introduction hole is provided, and an upper end edge of the outer cylinder and a lower end edge of the sealing cylinder are in contact with each other.

According to the present invention, since the communication passage that communicates the introduction hole and the introduction passage is formed in at least one of the outer cylinder and the cylinder, the stem is mounted in a state where the pump is attached to the container body. When the outside air temperature is lowered, for example, when the outside air temperature decreases or when the contents permeate the container body toward the outside, the outside air passes through the introduction passage, the communication passage, and the introduction hole, and enters the container body. It is possible to prevent the container main body from being depressurized and recessed.
In addition, after discharge of the contents, when the contents in the container body flow into the cylinder as the piston moves upward with respect to the cylinder, outside air flows into the container body through the introduction passage and the introduction hole, Depressurization in the container body is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a container main body pressure-reduces and carries out a hollow deformation | transformation at the time of the standby in the state with which the container main body was mounted | worn.

It is a longitudinal cross-sectional view of the pump shown as 1st Embodiment which concerns on this invention. In the pump of FIG. 1, it is a longitudinal cross-sectional view when the pressing head is located at the lower end position. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows the principal part of the pump shown as 2nd Embodiment concerning this invention. It is a longitudinal cross-sectional view which shows the principal part of the pump shown as 3rd Embodiment concerning this invention. It is a longitudinal cross-sectional view which shows the principal part of the pump shown as 4th Embodiment concerning this invention. It is a side view which shows the principal part of the piston shown in FIG.

Hereinafter, a pump 1 according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the pump 1 according to the present embodiment includes a stem 11 erected so as to be movable downward in an upward biased state, and an insertion hole 12 through which the stem 11 is inserted so as to be movable up and down. A mounting cap 13 that is formed and mounted on the mouth portion W1 of the container body W, a piston 14 that is linked to the stem 11, and a cylinder 15 in which the piston 14 is slidably fitted up and down are provided. .
The stem 11, the mounting cap 13, the piston 14 and the cylinder 15 are each arranged coaxially with the common shaft. Hereinafter, this common axis is referred to as an axis O, a direction orthogonal to the axis O in a plan view viewed from the direction of the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

  Further, in the present embodiment, the pump 1 is formed with a discharge hole 16 a for the contents, a pressing head 16 attached to the upper end of the stem 11, a lower part of the stem 11, and a cylinder 15. A piston guide 17 that can be moved up and down, a valve member 18 that opens and closes the lower end opening of the cylinder 15 and is disposed in a portion of the cylinder 15 located below the piston guide 17. And an urging means 19 for urging toward the.

The cylinder 15 is formed in a cylindrical shape, and a flange portion 15a that protrudes outward in the radial direction is formed over the entire circumference. The flange portion 15a is formed on the upper end opening edge of the mouth portion W1 of the container body W. Has been placed. The cylinder 15 is formed with an introduction hole 15 b that allows the inside of the container body W and the inside of the cylinder 15 to communicate with each other. A cylindrical body projects from the cylinder 15 downward, and a suction pipe 15c is fitted into the cylindrical body.
The pressing head 16 includes a fitting cylinder 16b fitted to the upper end portion of the stem 11, a discharge cylinder 16c that protrudes outward in the radial direction from the fitting cylinder 16b, and has a discharge hole 16a formed at the tip thereof. A screwing tube 16d surrounding the fitting tube 16b from the outside in the radial direction. The discharge cylinder 16c penetrates the threaded cylinder 16d in the radial direction.

  The mounting cap 13 is positioned at the lower end position by screwing the mounting cylinder 21 screwed into the mouth portion W1 of the container body W and the pressing head 16 positioned at the lower end position as shown in FIG. A regulation cylinder 22 that regulates the upward movement of the stem 11 and the pressing head 16 and a seal cylinder 23 that closes the introduction hole 15b of the cylinder 15 when the pressing head 16 is positioned at the lower end position are provided. .

The mounting cylinder 21 is formed in a top tube shape having an annular top wall 21a, and the upper end of the cylinder 15 located above the flange 15a is inserted inside the top wall 21a. The top wall portion 21 a is disposed on the flange portion 15 a of the cylinder 15.
The regulation cylinder 22 includes an external fitting cylinder 22a fitted on the upper end portion of the cylinder 15, and a male screw cylinder 22b into which a screwing cylinder 16d of the pressing head 16 located at the lower end position is screwed. Of the male screw cylinder 22b, the lower portion is inserted into the upper end portion of the cylinder 15, and the upper portion projects upward from the upper end portion of the cylinder 15. A male screw portion is formed on the outer peripheral surface of the upper portion. Anti-rotation portions that engage with each other are formed on the outer peripheral surface of the lower portion of the male screw cylinder 22b and the inner peripheral surface of the upper end portion of the cylinder 15, respectively.
The seal cylinder 23 is inserted into the male screw cylinder 22 b of the restriction cylinder 22, and a closed cylinder portion 23 a slidably fitted into the cylinder 15 is formed at the lower end portion thereof. As shown in FIG. 1, the closing cylinder portion 23 a protrudes downward from the male screw cylinder 22 b and abuts against the inner peripheral surface of the cylinder 15 during standby when the stem 11 is positioned at the rising end position. On the other hand, in the state where the stem 11 and the pressing head 16 are located at the lower end position and the pressing head 16 is screwed to the restriction cylinder 22 as shown in FIG. The hole 15b is closed. In the illustrated example, seal portions that bulge outward in the radial direction are formed at the upper end portion and the lower end portion of the closed cylinder portion 23a, respectively, and the pressing head 16 is screwed into the restriction cylinder 22 The introduction hole 15b is closed by being positioned between the seal portions of the closing cylinder portion 23a.

Here, the inside of the seal cylinder 23 serves as an insertion hole 12 through which the stem 11 is inserted so as to be movable up and down.
An introduction passage 25 is formed between the outer peripheral surface of the stem 11 and the insertion hole 12 to communicate the outside with the inner peripheral surface side of the outer cylinder 28 of the piston 14 described later. The introduction passage 25 is a radial gap between the outer peripheral surface of the stem 11 and the insertion hole 12.
The piston guide 17 protrudes downward from the lower end opening of the stem 11. The lower end portion of the piston guide 17 is formed in a crested cylindrical shape, and a plurality of proximity protrusions 17a that are close to the inner peripheral surface of the cylinder 15 are formed on the outer peripheral surface thereof at intervals in the circumferential direction. An upper end portion of the biasing means 19 is disposed in the lower end portion of the piston guide 17. When the stem 11 is restored and moved upward after the contents are discharged, the top wall portion at the lower end of the piston guide 17 is engaged with the lower end of the piston 14 and the piston 14 is restored and moved upward.
The valve member 18 is a check valve that keeps the lower end opening of the cylinder 15 closed when the cylinder 15 is pressurized, and opens the lower end opening of the cylinder 15 when the pressure in the cylinder 15 is reduced. As a result, when the pressure in the cylinder 15 is increased, the contents in the cylinder 15 are prevented from returning from the lower end opening of the cylinder 15 into the container body W. When the pressure in the cylinder 15 is reduced, the contents in the container body are It flows into the cylinder 15 from the lower end opening of 15.

The piston 14 includes an outer cylinder 28 formed with a seal portion 28 a that is in sliding contact with the inner peripheral surface of the cylinder 15, an inner cylinder 29 disposed inside the outer cylinder 28, and the outer cylinder 28 and the inner cylinder 29. And an annular connecting portion 27 connected over the circumference.
In the outer cylinder 28, a lower seal portion 28 d slidably in contact with the inner peripheral surface of the cylinder 15 is formed in a portion located below the seal portion 28 a in the same manner as the seal portion 28 a.
The connecting portion 27 connects the intermediate portions located between the upper end portion and the lower end portion of each of the outer cylinder 28 and the inner cylinder 29. The seal portion 28a and the lower seal portion 28d are formed separately at the upper end portion and the lower end portion of the outer cylinder 28, respectively, and bulge outward in the radial direction. A radial gap is provided between the outer peripheral surface of the intermediate portion of the outer cylinder 28 and the inner peripheral surface of the cylinder 15.
Here, in the standby state in which the stem 11 is positioned at the rising end position, the introduction hole 15b is opposed to a portion of the outer peripheral surface of the outer cylinder 28 positioned below the seal portion 28a in the radial direction. In the illustrated example, the introduction hole 15 b faces the outer peripheral surface of the intermediate portion of the outer cylinder 28 in the radial direction. That is, the introduction hole 15b is closed by being positioned between the seal portion 28a and the lower seal portion 28d.
Further, the upper end edge of the outer cylinder 28 is in contact with the lower end edge of the closing cylinder portion 23 a of the seal cylinder 23. The lower end of the stem 11 is externally fitted to the inner cylinder 29 so as to be slidable up and down.

In the present embodiment, at least one of the outer cylinder 28 and the cylinder 15 is formed with a communication passage 31 that communicates the introduction hole 15 b and the introduction passage 25.
In the illustrated example, the communication path 31 is a through-hole formed in a portion located above the connecting portion 27 in the intermediate portion of the outer cylinder 28. The communication path 31 faces the introduction hole 15b in the radial direction. The opening area of the communication path 31 is smaller than the opening area of the introduction hole 15b. The opening area of the communication path 31 may be equal to or larger than the opening area of the introduction hole 15b.

  Next, the operation of the pump 1 configured as described above will be described.

First, the pressing head 16 located at the lower end position as shown in FIG. 2 is rotated around the axis O with respect to the regulation cylinder 22, so that the internal thread portion of the screwing cylinder 16 d of the depression head 16 and the regulation cylinder are rotated. The threaded engagement with the male threaded portion of the 22 male threaded cylinder 22b is released. At this time, the piston guide 17, the stem 11, and the pressing head 16 are integrally raised by the upward biasing force of the biasing means 19. In this process, the top wall portion at the lower end portion of the piston guide 17 is engaged with the lower end of the inner cylinder 29 of the piston 14, and the piston 14 is also raised.
As a result, the inside of the cylinder 15 is depressurized, whereby the valve member 18 opens the lower end opening of the cylinder 15 and the contents in the container body W flow into the cylinder 15 through the suction pipe 15c. Further, the upper end edge of the outer cylinder 28 of the piston 14 is engaged with the lower end edge of the closed cylinder portion 23a of the seal cylinder 23, whereby the seal cylinder 23 is raised and separated upward from the introduction hole 15b. Covers the introduction hole 15b of the cylinder 15. At this time, the introduction hole 15 b communicates with the outside through the communication passage 31 of the piston 14 and the introduction passage 25.

Then, when the pressing head 16 is pressed and moved downward together with the stem 11 and the piston guide 17, first, the top wall portion at the lower end portion of the piston guide 17 is separated downward from the lower end of the inner cylinder 29 of the piston 14, The inside of the cylinder 15 and the inside of the stem 11 communicate with each other, and the lower end portion of the stem 11 abuts on the connecting portion 27 of the piston 14. Furthermore, if this downward movement is continued, the piston 14 is also moved downward, so that the piston 14 is separated downward from the introduction hole 15b, and the contents in the cylinder 15 are adjacent to each other in the circumferential direction in the piston guide 17. It flows between the protrusions 17a and flows into the stem 11 and is discharged from the discharge hole 16a.
Next, when the pressing of the pressing head 16 is released, the upward biasing force of the biasing means 19 causes the piston guide 17, the piston 14, the stem 11, and the pressing head 16 to be restored and moved upward as described above, and the container body The contents in W flow into the cylinder 15.

As described above, according to the pump 1 according to the present embodiment, the communication path 31 that communicates the introduction hole 15b and the introduction path 25 is formed in the outer cylinder 28. In the state where the stem 11 is positioned at the rising end position in the state where the stem 11 is mounted, the outside air is introduced into the introduction passage, for example, when the outside air temperature decreases or when the contents permeate the container body W toward the outside. 25, it will flow in into the container main body W through the communicating path 31 and the introduction hole 15b, and it can prevent that the container main body W depressurizes and sinks.
Further, when the contents in the container main body W flow into the cylinder 15 as the piston 14 moves upward with respect to the cylinder 15 after discharging the contents, the outside air flows through the introduction passage 25 and the introduction hole 15b. By flowing in, the decompression in the container main body W is suppressed.

  The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

  For example, in the above embodiment, the communication path 31 is configured to face the introduction hole 15b in the radial direction. However, as in the second embodiment shown in FIG. Or may be spaced downward. In the illustrated example, the communication path 32 penetrates the outer cylinder 28 in the radial direction and opens upward. A plurality of communication passages 32 are formed in the outer cylinder 28 at intervals in the circumferential direction.

Further, instead of the communication passages 31 and 32 of the above-described embodiment, as in the third embodiment shown in FIG. 5, the contact protrusion 28c protruding upward is formed in the circumferential direction on the upper end edge of the outer cylinder 28. A plurality of gaps are formed at intervals, and are radially extended on the inner peripheral surface of the cylinder 15 from the upper end of the opening peripheral edge of the introduction hole 15b and in the circumferential direction between adjacent contact projections 28c. The opposing grooves 15d may be formed.
In this case, the lower end edge of the closed cylinder portion 23a of the seal cylinder 23 is in contact with the upper end of the contact protrusion 28c, and the introduction hole 15b is a gap between the groove 15d and the contact protrusions 28c adjacent to each other in the circumferential direction. And communicates with the introduction passage 25. That is, the groove 15d and the gap between the contact protrusions 28c adjacent to each other in the circumferential direction form a communication path 33 that communicates the introduction hole 15b and the introduction path 25.

In this configuration, as in the fourth embodiment shown in FIGS. 6 and 7, the groove 15 d is not formed on the inner peripheral surface of the cylinder 15, and the abutment protrusion is formed on the outer peripheral surface of the seal portion 28 a of the outer cylinder 28. You may provide the hollow part 28b hollow toward the inner side of radial direction in the part along the circumferential direction in which 28c is located.
In this case, the introduction hole 15b communicates with the introduction passage 25 through the recess 28b and a gap between the contact protrusions 28c adjacent to each other in the circumferential direction. That is, the recess 28b and the gap between the contact protrusions 28c adjacent to each other in the circumferential direction form a communication path 34 that communicates the introduction hole 15b and the introduction path 25. In the illustrated example, the circumferential length of the recessed portion 28b is shorter than the circumferential length of the contact projection 28c, and the circumferential central portions of the recessed portion 28b and the contact projection 28c are coincident with each other.

In the third and fourth embodiments shown in FIGS. 5 to 7, the contact protrusion 28 c may be formed at the lower end edge of the closed cylinder portion 23 a of the seal cylinder 23 instead of the outer cylinder 28.
Further, in the third embodiment shown in FIG. 5, the groove 15d does not have to be opposed in the radial direction to the gap between the contact protrusions 28c adjacent to each other in the circumferential direction. A plurality of them may be formed, or they may be formed in an annular shape extending over the entire circumference.
Moreover, in 4th Embodiment shown by FIG.6 and FIG.7, you may mutually shift the position along the circumferential direction of the contact protrusion 28c and the hollow part 28b.

Further, the communication passage that communicates the introduction hole 15 b and the introduction passage 25 may not be formed in the outer cylinder 28 of the piston 14 but only in the cylinder 15.
Further, the configuration of the mounting cap 13, the piston guide 17, the valve member 18, and the like is not limited to the above-described embodiment, and may be appropriately changed.
In addition, not only the seal portion 28a but also the lower seal portion 28d is formed on the outer cylinder 28, but only the seal portion 28a may be formed and positioned above the introduction hole 15b.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Pump 11 Stem 12 Insertion hole 13 Mounting cap 14 Piston 15 Cylinder 15b Introduction hole 25 Introduction path 28 Outer cylinder 28a Seal part 31, 32, 33, 34 Communication path W Container main body W1 Mouth

Claims (1)

A stem erected in an upward biased state so as to be movable downward;
An insertion hole through which the stem is inserted so as to freely move up and down is formed, and a mounting cap that is mounted on the mouth of the container body,
A piston linked to the stem;
A cylinder fitted with the piston slidably up and down,
As the piston moves downward relative to the cylinder, the contents in the cylinder flow into the stem, and as the piston moves upward relative to the cylinder, the contents in the container body flow into the cylinder. A pump,
The piston is provided with an outer cylinder in which a seal portion is formed in sliding contact with the inner peripheral surface of the cylinder.
In the cylinder, an introduction hole is formed in a portion facing the outer peripheral surface of the outer cylinder and positioned below the seal portion,
Between the stem and the insertion hole, an introduction passage that communicates the outside and the inner peripheral surface side of the outer cylinder is formed,
At least the outer cylinder of the outer cylinder and the cylinder is formed with a communication path that communicates the introduction hole and the introduction path .
The mounting cap includes a seal cylinder that closes the introduction hole when the pressing head is positioned at a lower end position;
The pump according to claim 1 , wherein an upper end edge of the outer cylinder is in contact with a lower end edge of the seal cylinder .

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