JP2003095361A - Liquid ejection pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid ejection pump provided with a vertically movable operating member 4 attached with an ejection head 21 of an upper end of a stem 20 extending from the inside of a cylinder 2, constituted in such a manner that a peripheral wall 24 of the ejection head 21, whose screwed width is restricted by an upward step 13 provided at a lower part of a ring-like member 3 and which is in a push-down state, is screwed on a spirally grooved peripheral face a of the ring-like member 3 fitted with an upper end of the cylinder 2, further constituted in such a manner that the operating member 4 is tightly fitted in a screwed state to an inner peripheral face of the ring-like member 3 to seal it, and capable of correctly obtaining the result of a test for airtightness as this sealed portion. SOLUTION: The liquid ejection pump is constituted so that by providing a communicating passage p for allowing the above sealed portion to communicate with the external side through a closed space b defined by a ring-like member 3 and an ejection head 21, the correct result of a test for airtightness can be obtained even if an underface of a peripheral wall 24 of the ejection head 21 is airtightly brought into pressure contact with an upward step 13.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid jet pump.

[0002]

2. Description of the Related Art As a liquid jet pump, a mounting cylinder is used to fix it to the neck of a container body, a lower cylinder is hung in the container body, and a jet head is fitted to the upper end of a stem protruding upward from the cylinder. It is known that an operating member is provided so that it can be moved up and down while being worn and is urged upward, and the liquid in the mounted container body is sucked up by the upward movement of the operating member and ejected from the ejection port of the ejection head. .

These can also be provided with a ring-shaped member that covers and fits the upper end of the cylinder and keeps the operating member in a depressed state to prevent accidental leakage of liquid or containers. It is configured to prevent leakage of liquid when it is laid down.

As a concrete example, as shown in FIG. 17, the liquid ejection pump 1A is fixed to the mouth / neck portion 8A of the container body 5A by a mounting cap 7A, and is a cylinder suspended in the container body. A ring-shaped member 3A is fitted on the upper end of 2A. The ring-shaped member 3A is tightly fitted to the inner peripheral surface of the upper end of the cylinder 2A to prevent the liquid from leaking from this. Further, the ejection head 21A is fitted and fixed to the upper end of the stem 20A protruding from the inside of the cylinder 2A. In addition, the stem 20
A and the peripheral wall of the ejection head 21A are attached to the outer peripheral surface of the ring-shaped member 3A with the operating member 4A provided with the ejection head 21A being pushed down.
The 24A is configured to be screwed, and at this time, the operating member 4A at the position corresponding to the inner peripheral surface of the ring-shaped member 3A is closely fitted to the inner peripheral surface of the ring-shaped member 3A.

Although it is intended to carry, store, etc. in such a state, the operating member 4A does not move because it is fixed by being pressed down, and it is possible to prevent malfunction or leakage of liquid due to external force, and the container falls down. Even if it does, the seal part can prevent leakage.

In such a pump, gas is sent from the outside air introduction hole 6A of the cylinder 2A to inspect the airtightness of each seal portion. However, in the conventional pump of this type, the peripheral wall 24A of the jet head 21A has a ring-shaped member.
3A ring-shaped member to be screwed into place on the outer peripheral surface
An upward step 13A is formed at a predetermined position on the lower portion of the outer periphery of 3A. Therefore, the lower surface of the jet head peripheral wall 24A is the upward step.
There may be close contact with 13A and airtightness may also occur in this part.
Even if the seal portion with the inner peripheral surface of 3A was inferior in airtightness, the test results could not be obtained accurately.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and proposes a liquid jet pump capable of accurately obtaining a test result of an airtightness test by simply changing the structure.

[0008]

In order to solve the above-mentioned problems, the liquid jet pump according to the first aspect of the present invention includes a cylinder 2 having an outside air introducing hole 6 communicating with the inside of the container body 5 to be mounted, and a cylinder. (2) A thread forming peripheral surface (a) which covers the periphery of the upper end portion and has a ring shape which is tightly fitted to the inner peripheral surface of the cylinder (2) via the first seal portion (s1) and which has an upward step portion (13) at the lower portion. The jet head 21 is fitted to the upper end of the provided ring-shaped member 3 and the stem 20 projecting from the inside of the cylinder 2 through the through-hole 19 at the center of the ring-shaped member 3 and is vertically movable in an upwardly biased state. The operating member 4 is provided, and the liquid in the container body 5 fitted by the vertical movement of the operating member 4 is sucked up and ejected from the ejection port 26 of the ejection head 21. The peripheral wall 24 of the Regulated by the width, screwing into threaded forming peripheral surface a is capable constructed, and, second sealing portion operates in three inner circumference the ring-shaped member in a screw-attaching state member 4 is engaged tightly fit
In the liquid ejection pump configured to form s2, the second seal portion s2 is connected to the ring-shaped member 3 and the ejection head 21.
The liquid ejection pump is characterized in that a communication passage p is provided which communicates with the outside through the closed space b formed in 1.

A liquid jet pump according to a second aspect of the invention is
The ring-shaped member 3 vertically hangs a seal tube 14 tightly fitted to the upper end of the inner peripheral surface of the cylinder 2 via the first seal portion s1 from the back surface of the donut plate-shaped top plate 15 and
A ring-shaped member in which a guide cylinder 17 is hung from the inner peripheral edge of 15 and a peripheral wall 18 having a thread forming peripheral surface a having the above-mentioned step 13 is hung from the outer peripheral edge of the top plate 15. The jet head 21 has a vertical cylinder 22 in which the lower portion is tightly fitted on the upper end of the stem 20 as a top wall.
23 It hangs down from the back side, and the top wall 23
And a base end communicating with the upper part of the vertical cylinder 22.
The liquid jet pump according to claim 1, wherein the jet head 25 is formed by penetrating the peripheral wall 24 and projecting forward.

A liquid jet pump according to a third aspect of the present invention is
The communication passage p is regulated by the contact between the lower surface of the rib 43 vertically extending outside the vertical cylinder 22 of the ejection head 21 and the upper surface of the ring-shaped member 3, and the lower surface of the peripheral wall 24 of the ejection head and the upward step 13 The gap 44 between the upper surface and the upper surface constitutes the liquid jet pump according to claim 2.

A liquid jet pump according to a fourth aspect of the present invention is
The liquid ejection pump according to claim 1, wherein the communication passage p is a groove 33 provided on the lower surface of the peripheral wall 24 of the ejection head 21.

The liquid jet pump according to a fifth aspect of the invention is
The recessed groove 33 is formed on the press machine before the ejection head 21 is assembled.
The liquid jet pump according to claim 4, which is a groove formed by 35.

A liquid jet pump according to a sixth aspect of the invention is
2. The liquid jet pump according to claim 1, wherein the communication passage p is a groove 36 provided in a portion extending from the tip of the upward step 13 of the ring-shaped member 3 to the upper end of the thread forming peripheral surface a.

A liquid jet pump according to a seventh aspect of the invention is
The communication passage p is a through hole 37 provided in the peripheral wall 24 of the jet head 21.
The liquid jet pump according to claim 1 is configured as follows.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the liquid jet pump 1 of the present invention. The pump 1 comprises a cylinder 2, a ring-shaped member 3 and an operating member 4.

The cylinder 2 is provided with an outside air introduction hole 6 communicating with the inside of the container body 5 to be mounted, and the mounting cap 7 hangs the lower end into the container body to fix the upper part to the container body neck portion 8. ing. In the illustrated example, the flange 10 protruding from the outer peripheral upper portion of the peripheral wall 9 is placed on the upper surface of the mouth / neck portion 8 of the container body 5 through the packing 11, and the flange-shaped top plate of the mounting cap 7 is provided between the upper surface and the upper surface of the mouth / neck portion 8. It is clamped and fixed to.

The ring-shaped member 3 covers the upper end of the cylinder 2 and has a ring shape that is closely fitted through the first seal portion s1, and has a screw 12 having an upward step 13 at the lower part of the thread 12. It has a line-forming peripheral surface a. In the illustrated example, a seal cylinder 14 that is closely fitted to the upper end of the inner peripheral surface of the cylinder 2 is hung vertically from the rear surface of the donut plate-shaped top plate 15. In this case, the upper end portion of the cylinder 2 is formed to have a slightly expanded diameter, and the lower end portion of the seal cylinder 14 is closely fitted to the inner surface immediately below the expanded diameter portion to form the first seal portion s1. is doing. Also, cylinder 2
On the inner surface of the expanded part of the
14 A large number of vertical protrusions are provided on the upper end of the outer periphery in the circumferential direction so as to prevent mutual rotation.

Further, a fitting cylinder 16 vertically extending from the back surface of the top plate 15 is fitted to the upper end of the outer periphery of the cylinder 2 through concave and convex engaging means so as to prevent the fitting cylinder 16 from coming out upward. Furthermore, the top plate 15
A guide cylinder 17 that forms a seal portion with the actuating member 4 is vertically provided below the inner peripheral edge of the. This guide cylinder 17 is a seal cylinder 14.
It is also possible to adopt a configuration that is also used as. Also, the top plate 15
A peripheral wall 18 is provided so as to extend downward from the outer peripheral edge of, and the outer surface thereof is configured as a thread forming peripheral surface a with an upward step 13. still,
The thread forming peripheral surface can be formed on the outer surface of the fitting cylinder 16, or a new cylindrical portion can be erected from the top plate 15 and formed on the outer peripheral surface thereof.

The actuating member 4 is fitted with a jet head 21 on the upper end of a stem 20 projecting from the inside of the cylinder 2 through a through hole 19 at the center of the ring-shaped member 3 and is vertically movable in an upwardly biased state. It is provided.

In the illustrated example, a vertical cylinder 22 in which a lower part is closely fitted to the outer periphery of the upper end of the stem 20 is hung vertically from the center of the back surface of the top wall 23, and a peripheral wall 24 is hung vertically from the peripheral edge of the top wall 23. The tip of a nozzle 25 having a base end opened at the upper part of the cylinder 22 penetrates the peripheral wall 24 and projects forward, and the tip is opened as a jet port 26 to form the jet head 21. Incidentally, 27 in the drawing indicates a rib.

The vertical movement of the actuating member 4 sucks up the liquid in the mounted container body 5 and causes the ejection port 26 of the ejection head 21.
It is configured so that it gushes out more. Such a pump mechanism can adopt various conventionally known configurations, and when explaining the illustrated example,
A suction valve 28 is provided in the lower part of the cylinder 2 and a discharge valve 29 is provided in the upper part of the stem 20, and an annular piston 30 fitted in the cylinder 2 is provided at the lower end of the outer periphery of the stem 20 so as to project. In addition, a coil spring is interposed on the lower surface of the operating member 4 to constantly urge it upward.

Further, the peripheral wall 24 of the ejection head 21 in the depressed state
Is configured to be screwed to the thread forming peripheral surface a while the screwing width is restricted by the upward stepped portion 13, and the operating member 4 is attached to the inner peripheral surface of the ring-shaped member 3 in the screwed state. The second seal portion s2 is formed by closely fitting.

In the illustrated example, the upper end of the inner peripheral surface of the guide cylinder 17 is formed to project inward, and the upper part of the vertical cylinder 22 of the jet head 21 is formed to have a slightly larger diameter. Are configured to be closely fitted to each other, and this portion is configured as the second seal portion s2. Further, a screw thread 32 provided around the inner circumference of the peripheral wall 24 of the jet head 21 can be screwed onto the screw thread 12 of the ring-shaped member 3. In this screwed state, the screwing width is regulated so that the lower surface of the peripheral wall 24 of the jet head 21 abuts on the upward stepped portion 13 to obtain a proper end point of the screwing descent.

According to the present invention, in the liquid jet pump constructed as described above, the second seal portion s2 is connected to the outside through the closed space b formed by the ring-shaped member 3 and the jet head. A passage p is provided.

By providing such a communication passage p, when the lower surface of the peripheral wall 24 of the jet head 21 is in close contact with the upper surface of the upward step 13 of the ring-shaped member 3 when performing the airtightness test of the pump. Even if there is, it is configured so that accurate test results can be obtained.

As an air tightness test, for example, as shown in FIG. 1, the operating member 4 is pushed down and screwed, and the outside air introduction hole 6 is inserted.
It is carried out by further injecting a gas such as air and checking how the pressure is reduced. The gas that is press-fitted is not sealed because it is normally sealed and sealed by each seal part. When there is a defect in the first seal portion s1, from there, it passes between the seal cylinder 14 and the cylinder 2, and between the fitting cylinder 16 and the cylinder 2, and between the ring-shaped member peripheral wall 18 and the mounting cap 7. It leaks to the outside. If there is a defect in the second seal part s2,
From there, it passes through the closed space b formed by the jet head 21 and the ring-shaped member 3 and the threaded portion, and leaks to the outside from between the jet head peripheral wall 24 and the upward step 13. Therefore, when only the second seal portion s2 is defective, even if the head peripheral wall 24 and the upward step portion 13 are in close contact with each other, gas leaks to the outside from the communication passage p, and an accurate test is performed. It is constructed so that the results can be obtained.

The communication passage p can adopt various forms. For example, as shown in FIGS. 1 to 3, it can be formed as a concave groove 33 provided on the lower surface of the peripheral wall 24 of the jet head 21. Groove 33
The number may be one or two or more. In this case, when there is a problem in the second seal portion s2 during the air tightness test, the gas introduced through the outside air introduction hole 6 passes through the second seal portion s2, passes through the screwed portion from the closed space b. It can be seen that there is a leak in the second seal portion s2 that is ejected from the concave groove 33.

The concave groove 33 provided on the lower surface of the peripheral wall 24 of the jet head 21 can be formed by a press machine before the jet head is assembled. For example, as shown in FIG. 4 (a), using a press machine 35 having a predetermined protrusion 34 on the lower surface,
As shown in FIG. 4 (b), the ejection head 21 before assembly is turned upside down and pressed from above so that the concave groove 33 can be easily formed as shown in FIG. 4 (c). Therefore, it is possible to easily form a pump having the communication passage p by using an existing pump.

Further, as shown in FIGS. 5 to 7, the communication passage p is formed as a concave groove 36 provided in a portion extending from the tip end of the upward step of the ring-shaped member 3 to the upper end of the thread forming peripheral surface a. be able to. In this case, the groove 12 is provided by vertically cutting the thread 12 on the thread forming peripheral surface a. Similarly, the number of the grooves 36 may be one or two or more.

Further, the communication passage p may be formed as a through hole 37 provided in the peripheral wall 24 of the jet head as shown in FIG.
Such a through-hole-shaped communication passage p may be formed as a through-hole 38 provided in the top plate 15 of the ring-shaped member 3, as shown in FIG. Further, although not shown, it may be provided on the top wall 23 of the ejection head 21. Similarly, the number of through holes can be 1 or 2 or more.

Further, as shown in FIG. 10 to FIG. 12, the communication passage p is defined by the lower surface of the peripheral wall 24 of the ejection head 21 and the upper surface of the upward stepped portion 13 which is restricted by the projection 39 protruding on the upper surface of the upward stepped portion 13. It may be configured as the gap 40. As shown in FIGS. 13 and 14, the communication path in the form of a gap formed by such a protrusion is, as shown in FIGS. 13 and 14, a lower surface of the peripheral wall 24 of the ejection head 21 regulated by a protrusion 41 protruding from the lower surface of the peripheral wall 24 of the ejection head 21. Upward step
It may be configured as a gap 42 between the upper surface 13 and the upper surface. The number of each protrusion can be 1 to 2 or more.

Further, as shown in FIGS. 15 to 16, the communication passage p is formed by contact between the lower surface of the rib 43 formed outside the vertical cylinder 22 of the jet head 21 and the upper surface of the top plate 15 of the ring-shaped member 3. It may be configured as a regulated gap 44 between the lower surface of the peripheral wall 24 of the ejection head 21 and the upper surface of the upward step portion 13. The number of ribs 43 may be one or two or more, but it is preferable to provide a plurality of ribs 43 in the circumferential direction from the viewpoint of strength.

[0034]

As described above, the liquid jet pump of the present invention, having the above-mentioned configuration, can accurately obtain the test result of each seal portion when performing the airtightness test.

The pump of the third aspect of the present invention is the communication passage p.
As a rib 43 and ring-shaped member 3 provided on the ejection head 21
Since the gap 44 between the lower surface of the jet head peripheral wall 24 and the upper surface of the upward stepped portion 13 which is regulated by the contact with the upper surface is adopted, the structure is extremely simple and it can function at any position in the circumferential direction. Therefore, there are few restrictions on the formation position, the formation is easy, and there is no risk of causing a malfunction as a communication passage due to an incorrect formation position.

The pump according to the fourth aspect of the present invention is the communication passage p.
Since the concave groove 33 provided on the lower surface of the jet head peripheral wall 24 is adopted as the structure, the structure is extremely simple, and similarly, since it functions even if it is provided at any position in the circumferential direction, there are few restrictions on the formation position and its formation. It is easy and there is no risk of causing a malfunction as a communication passage due to an incorrect forming position.

Further, the pump of the fifth aspect of the present invention has an advantage that an existing pump can be utilized to form a pump having the communication passage p very easily.

Further, in the pump of the sixth aspect of the invention, as the communication passage, the concave groove 36 provided in the portion from the tip of the upward step 13 of the ring-shaped member 3 to the upper end of the thread forming peripheral surface a is adopted. Since the thread 12 on the thread forming peripheral surface a is cut longitudinally to form the concave groove 36, more reliable communication with the outside becomes possible.

The pump according to the seventh aspect of the present invention is the communication passage p.
As the through hole 37 provided in the jet head peripheral wall 24 is adopted as the above, the formation thereof is easy, and in this case as well, the existing pump is used and the pump provided with the communication passage p by post-processing is simple. There is an advantage that it can be formed.

[Brief description of drawings]

FIG. 1 is a side view of a partially cutaway essential part showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a communication passage portion of the embodiment.

FIG. 3 is an enlarged front view of a main part of a communication passage portion of the embodiment.

FIG. 4 is an explanatory diagram illustrating a method of forming a communication passage of the embodiment.

FIG. 5 is a side view of a partly cutaway essential part showing another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of an essential part of a communication passage portion of the embodiment.

FIG. 7 is an enlarged front view of a main part of a communication passage portion of the embodiment.

FIG. 8 is a side view of a partially cutaway essential portion showing still another embodiment of the present invention.

FIG. 9 is a side view of a partially cutaway essential portion showing still another embodiment of the present invention.

FIG. 10 is a side view of a partially cutaway essential portion showing still another embodiment of the present invention.

FIG. 11 is an enlarged sectional view of an essential part of a communication passage portion of the embodiment.

FIG. 12 is an enlarged front view of a main part of a communication passage portion of the embodiment.

FIG. 13 is an enlarged cross-sectional view of a main part of a communication passage portion showing still another embodiment of the present invention.

FIG. 14 is an enlarged front view of a main part of a communication passage portion of the embodiment.

FIG. 15 is a side view of a partially cutaway essential portion showing still another embodiment of the present invention.

FIG. 16 is an enlarged sectional view of an essential part of a communication passage portion of the embodiment.

FIG. 17 is a side view of a partly cutaway essential portion showing an example of a conventional pump.

[Explanation of symbols]

2 ... Cylinder, 3 ... Ring-shaped member, 4 ... Actuating member, 5 ...
Container body, 6 ... Outside air introduction hole, 13 ... Upward step, 14 ... Seal tube, 15 ... Top plate, 17 ... Guide tube, 18 ... Ring member peripheral wall, 19
… Through hole, 20… Stem, 21… Jet head, 22… Vertical tube, 23
… Jet head top wall, 24… Jet head peripheral wall, 25… Nozzle,
26 ... Jet, 33 ... Groove, 35 ... Press machine, 36 ... Groove, 43 ...
Ribs, 44 ... Gap, a ... Thread forming peripheral surface, b ... Closed space, s1 ...
1st seal part, s2 ... 2nd seal part, p ... communication path

Claims (7)

[Claims] 1. A cylinder 2 provided with an outside air introduction hole 6 communicating with the inside of a container body 5 to be mounted, and surrounding the upper end portion of the cylinder 2 and a first seal portion s1 on the inner peripheral surface of the cylinder 2. A ring-shaped member 3 having a screw-formed peripheral surface a having an upward step 13 at the bottom and a through hole 19 in the center of the ring-shaped member 3 from inside the cylinder 2. The jet head 21 is attached to the upper end of the stem 20 protruding through
And an actuating member 4 provided so as to be able to move up and down while being urged upward, and the liquid in the fitted container body 5 is sucked up by the up and down movement of the actuating member 4 and the ejection port 26 of the ejection head 21. Further, the peripheral wall 24 of the ejection head 21 in the depressed state is configured to be screwed onto the thread forming peripheral surface a while the screwing width is regulated by the upward stepped portion 13. Further, in the liquid jet pump configured such that the operating member 4 is closely fitted to the inner peripheral surface of the ring-shaped member 3 in the screwed state to form the second seal portion s2, the second seal portion s2 is A liquid ejection pump, characterized in that a communication passage (p) communicating with the outside through a closed space (b) formed by the ring-shaped member (3) and the ejection head (21) is provided. 2. A ring-shaped member (3) is provided with a seal tube (14) tightly fitted to the upper end of the inner peripheral surface of a cylinder (2) via the first seal part (s1) and hung vertically from the back surface of a donut plate-shaped top plate (15). In addition, a ring-shaped member is formed by vertically arranging a guide cylinder 17 from the inner peripheral edge of the top plate 15 and vertically arranging a peripheral wall 18 provided with a thread forming peripheral surface a having the above-mentioned step 13 from the outer peripheral edge of the top plate 15. And
The ejection head 21 has a vertical cylinder 22 in which a lower part is tightly fitted to the upper end of the stem 20 and is vertically hung from the back surface of the top wall 23, and a peripheral wall 24 is vertically hung from the peripheral portion of the top wall 23, and is provided above the vertical cylinder 22. 2. The liquid jet pump according to claim 1, wherein the nozzle 25 is a jet head formed by penetrating the peripheral wall 24 and projecting forward with a nozzle 25 having base ends communicating with each other. 3. The liquid jet pump according to claim 1, wherein the communication passage p is a groove 33 provided on the lower surface of the peripheral wall 24 of the jet head 21. 4. The liquid jet pump according to claim 3, wherein the concave groove 33 is a concave groove formed by a press machine 35 before the ejection head 21 is assembled. 5. The liquid jet pump according to claim 1, wherein the communication passage p is a groove 36 provided in a portion extending from the tip of the upward step 13 of the ring-shaped member 3 to the upper end of the thread forming peripheral surface a. . 6. The liquid jet pump according to claim 1, wherein the communication passage p is a through hole 37 provided in the peripheral wall 24 of the jet head 21. 7. The lower surface of the peripheral wall 24 of the ejection head, wherein the communication passage p is regulated by the contact between the lower surface of a rib 43 vertically extending outside the vertical cylinder 22 of the ejection head 21 and the upper surface of the ring-shaped member 3. 3. The liquid jet pump according to claim 2, wherein a gap 44 is formed between the upper surface of the upward step portion 13 and the upper surface of the upward step portion 13.