JP2005023859A - Jet-spray pump device and jet sprayer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet-spray pump device in which a liquid in a pressure chamber is prevented from flowing backward in an open-air-introducing path through an open-air introducing hole and a residual pressure-releasing hole, and leaking to the outside. <P>SOLUTION: A cylinder 28 is placed in a cylinder-holding part of a pump main-body. In the cylinder, the open-air-inlet hole 28a and the residual-pressure releasing hole 28b are made at an interval. When a piston is pushed in the cylinder, a container communication path is allowed to communicate with ambient air through the outside of the cylinder from the open-air inlet hole. At the same time, in the last stage of pushing the piston, the pressure chamber is allowed to communicate with the container communication path through the outside of the cylinder from the residual-pressure releasing hole. On the outside periphery of the cylinder, a U-shaped guide protrusion 28e is provided, which surrounds the residual-pressure-releasing hole to shut up the space to the open-air inlet hole, and open to the container communication path. It is recommended to provide a circumferential protrusion 28d on the outside periphery of the cylinder between the open-air inlet hole and the residual-pressure releasing hole. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
In use, this invention operates an operation member such as an operation button or a trigger lever to push a piston into a cylinder, increase a pressure in the pressure chamber to open a valve at the outlet of the pressure chamber, and discharge the liquid in the pressure chamber to the outlet. The present invention relates to a jet pump device that jets out from a nozzle through a nozzle hole. In addition, the present invention relates to an ejector such as a spray, in which such an ejection pump device is attached to the mouth of the container, and the liquid in the container is sucked and ejected to the outside by the ejection pump device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a pressure accumulation type as shown in FIG.
[0003]
In this type of ejection pump device, in use, the trigger lever 1 is rotated in the direction of the arrow, the ejection cap 2 is pushed, the plunger 3 is moved as shown in FIG. 6, and the piston 5 is moved against the coil spring 4. The plunger 3 is pushed into the cylinder 6 to increase the pressure in the pressure chamber p to move the plunger 3 relative to the ejection cap 2, and the valve portion 3 a of the plunger 3 is opened to allow the liquid in the pressure chamber p to flow through the outflow passage 5 a of the piston 5. 3 is inserted into the passage q between the plunger 3 and the ejection cap 2 through the outflow passage 3b, led to the outflow passage 2b through the outlet 2a of the ejection cap 2 which is the outlet of the pressure chamber p, and from the nozzle port 7a of the nozzle member 7 to the outside. It was erupting.
[0004]
Here, as shown in FIG. 5 (B), the cylinder 6 is provided with an outside air introduction hole 6a and a residual pressure release hole 6b penetrating the inside and outside, and a protrusion 6c on a part of the inner peripheral surface at the inner back. Is provided. Then, the piston 5 is pushed into the cylinder 6, and when the second seal portion 5b of the piston 5 and the seal portion 3c of the plunger 3 pass through the outside air introduction hole 6a as shown in FIG. I was communicating. That is, outside air is guided around the cylinder 6 through the outside air introduction path 6a as indicated by an arrow a, and is guided from around the cylinder 6 into a container (not shown) through a container communication path r as indicated by an arrow b. It was.
[0005]
Further, when the piston 5 is pushed to the final stage, the first seal portion 5c of the piston 5 rides on the projection 6c of the cylinder 6 and opens a part thereof, and as shown in FIG. 7, the pressure chamber p, the container communication path r, Was in communication. That is, the pressure in the pressure chamber p is guided to the outside of the cylinder 6 through the residual pressure release hole 6b as indicated by an arrow c, and is guided from the periphery of the cylinder 6 into a container (not shown) through the container communication path r as indicated by an arrow d. The residual pressure was eliminated by setting the pressure in the pressure chamber p to an atmospheric pressure equal to that in the container.
[0006]
However, in such a jet pump device, as shown in FIG. 7, when the piston 5 is pushed to the final stage, the pressure in the pressure chamber p leaks out of the cylinder 6 through the residual pressure release hole 6b as shown by the arrow c. The leaked liquid enters the cylinder 6 again through the outside air introduction hole 6a and flows backward through the passage between the cylinder 6 and the plunger 3, and the cylinder 6, the plunger 3, the ejection cap 2, and the cover 8 May enter the space s defined by When the amount of liquid in the space s increases, there is a problem of leaking to the outside as indicated by an arrow e through a passage between the ejection cap 2 and the cover 8.
[0007]
[Patent Document 1] Japanese Patent Laid-Open No. 10-174911 Therefore, in the conventional jet pump device, as described in Patent Document 1, for example, on the outer peripheral surface of the cylinder 6, the outside air introduction hole 6a and the residual pressure release hole are provided. As shown in FIG. 5B, a circumferential protrusion 6d is provided between the cylinder 6b and a narrow groove 9a in the reciprocating direction of the piston 5 on the inner peripheral surface of a cylinder housing portion 9b provided in the pump body 9. Was forming. Thus, the outside air can be circulated through the narrow groove 9a, but the liquid is difficult to pass.
[0008]
[Problems to be solved by the invention]
However, even in such a configuration, due to complex factors such as the degree of decompression in the container, the amount of liquid leaking out of the cylinder 6 and the use angle of the jet pump device, the gap between the cylinder 6 and the plunger 3 is still passed through the narrow groove 9a. There is a problem in that the liquid flows backward through the passageway, and the liquid flows backward from the space s through the passageway between the ejection cap 2 and the cover member 8 as shown by the arrow e and leaks to the outside.
[0009]
Accordingly, the first object of the present invention is to communicate the atmosphere and the container communication passage through the outside of the cylinder from the outside air introduction hole when the piston is pushed into the cylinder, and from the residual pressure release hole to the outside of the cylinder at the final push-in stage of the piston. In the jet pump device that communicates the pressure chamber and the container communication path through the liquid, the liquid in the pressure chamber is prevented from flowing back through the outside air introduction hole and the residual pressure release hole and leaking outside.
[0010]
The second object of the present invention is to more reliably prevent liquid leakage in such a jet pump device.
[0011]
A third object of the present invention is to provide an ejector including an ejection pump device that achieves the above object.
[0012]
[Means for Solving the Problems]
For this reason, in order to achieve the first object described above, the invention described in claim 1 is provided with an outside air introduction hole and a residual pressure release hole penetrating the inside and outside of the cylinder, and the piston is pushed into the cylinder. In the ejection pump device that communicates the atmosphere and the container communication path from the outside air introduction hole through the outside of the cylinder and communicates the pressure chamber and the container communication path from the residual pressure elimination hole through the outside of the cylinder at the final push-in of the piston.
A guide protrusion is provided on the outer peripheral surface of the cylinder so as to surround the residual pressure elimination hole and shield the space from the outside air introduction hole and open toward the container communication path.
[0013]
The invention described in claim 2 is also characterized in that, in order to achieve the above first object, in the ejection pump device according to claim 1, the guide projection is U-shaped.
[0014]
According to a third aspect of the present invention, in order to achieve the second object described above, in the jet pump device according to the first or second aspect, the outer peripheral surface of the cylinder is an outside air introduction hole, a residual pressure elimination hole, A circumferential protrusion is provided between the two.
[0015]
According to a fourth aspect of the present invention, there is provided an ejector comprising the ejection pump device according to the first, second, or third aspect in order to achieve the third object described above.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a longitudinal section of the ejection pump device according to the present invention when not in use. The ejection pump device 20 according to the present invention is attached to the mouth portion of the container 10 indicated by a chain line in the figure to constitute an ejection device.
[0017]
The container 10 is made, for example, in a bottle shape with a plastic material, provided with a male screw on the outer periphery of the mouth portion, and stores a liquid such as a cleaning liquid or a disinfecting liquid therein.
[0018]
The ejection pump device 20 is screwed with a screw cap 22 to the mouth portion of the container 10, presses the connecting cylinder 23, and compresses and attaches the packing 24 between the mouth portion. The connecting cylinder 23 holds the tube 25, supports a ball valve 26 that opens and closes the liquid supply path, and connects the screw cap 22 to the pump body 27. The pump body 27 is formed with a cylinder housing portion 27b having a narrow groove 27a on the inner peripheral surface, and the cylinder 28 is housed in the cylinder housing portion. A container communication path R communicating with the inside of the container 10 is formed between the pump body 27 and the cylinder 28 through the communication hole 27 c of the pump body 27 and the communication hole 23 a of the connection cylinder 23.
[0019]
As shown in FIG. 2, the cylinder 28 is provided with an outside air introduction hole 28 a and a residual pressure release hole 28 b at an interval through the inside and outside, and a protrusion 28 c on a part of the inner peripheral surface at the inner back. Form. Further, on the outer peripheral surface of the cylinder 28, between the outside air introduction hole 28a and the residual pressure elimination hole 28b, a circumferential protrusion 28d is provided annularly so as to protrude from the peripheral surface. Further, a guide protrusion 28e is provided on the outer peripheral surface of the cylinder 28 so as to surround the residual pressure elimination hole 28b and protrude from the peripheral surface. The guide protrusion 28e is U-shaped and blocks the outside air introduction hole 28a, while opening toward the container communication path R.
[0020]
A coil spring 29 and a piston 30 are placed in the cylinder 28. The piston 30 is provided with an outflow passage 30a, and a first seal portion 30c and a second seal portion 30b that are pressed against the inner peripheral surface of the cylinder 28 are provided in the front-rear direction. Then, the pressure chamber P is formed by being partitioned by the pump main body 27, the cylinder 28, the piston 30, and the like.
[0021]
The piston 30 is covered with a plunger 32. The plunger 32 is provided with a valve portion 32 a, an outflow path 32 b, and a seal portion 32 c that presses against the inner peripheral surface of the cylinder 28. The plunger 32 is covered with an ejection cap 33. The ejection cap 33 forms a passage Q between the plunger 32 and an outlet 33a that opens and closes by the valve portion 32a of the plunger 32 and an outflow path 32b. A nozzle member 34 having a nozzle hole 34a at the center is attached to the tip.
[0022]
Then, it is hooked by the cover member 35 attached to the outside of the ejection cap 33, and the ejection cap 33, the plunger 32 and the piston 30 are pressed down, and the cover member 35 is attached and fixed to the pump body 27.
[0023]
A trigger lever 36 that is rotatably supported by the pump body 27 is engaged with the ejection cap 33 via an adapter 37. When not in use, a stopper 38 is inserted between the cover member 35 and the trigger lever 36 which is an operation member to prevent the trigger lever 36 from rotating unintentionally.
[0024]
Now, when using this ejector, the stopper 38 is removed and the nozzle 34a is directed to the target site. Then, the trigger lever 36 is rotated in the direction of the arrow to push the ejection cap 33, and the ejection cap 33 is pushed to move the plunger 32 and move the plunger 30 against the coil spring 29 as shown in FIG. 3. The plunger 32 is moved relative to the ejection cap 33 by increasing the pressure in the pressure chamber P, and the valve portion 32a of the plunger 32 is opened to allow the liquid in the pressure chamber P to flow out from the outflow passage 30a of the piston 30. It enters into the passage Q through the passage 32b, is led to the outflow passage 33b through the outlet 33a of the ejection cap 33 which is the outlet of the pressure chamber P, and is ejected from the ejection port 34a of the nozzle member 34 to the outside.
[0025]
At this time, when the piston 30 is pushed into the cylinder 28 and the second seal portion 30b of the piston 30 and the seal portion 32c of the plunger 32 pass through the outside air introduction hole 28a as shown in FIG. An atmosphere introduction path that communicates the atmosphere and the container communication path R through is formed, the outside air is guided around the cylinder 28 through the outside air introduction hole 28a, and is guided from the circumference of the cylinder 28 into the container 10 through the container communication path R. Is atmospheric pressure.
[0026]
When the piston 30 is pushed to the final stage, the first seal portion 30c of the piston 30 rides on the protrusion 28c of the cylinder 28 and opens a part thereof, and passes through the outside of the cylinder 28 from the residual pressure release hole 28b as shown in FIG. A residual pressure release path that connects the pressure chamber P and the container communication path R is formed, the pressure in the pressure chamber P is guided to the outside of the cylinder 28 through the residual pressure release hole 28b, and the container 10 passes from around the cylinder 28 through the container communication path R. The residual pressure is eliminated by setting the pressure in the pressure chamber P to an atmospheric pressure equal to that in the container 10.
[0027]
By the way, when the piston 30 is pushed to the final stage, the pressure in the pressure chamber P is guided to the outside of the cylinder 28 through the residual pressure release hole 28b. At this time, the liquid leaks out of the cylinder 28 by the pressure in the pressure chamber P. However, the outer peripheral surface of the cylinder 28 is provided with a U-shaped guide protrusion 28e that surrounds the residual pressure elimination hole 28b and blocks the outside air introduction hole 28a and opens toward the container communication path R. The leaked liquid is prevented from flowing in the direction of arrow A in FIG. 2 by the guide protrusion 28e, guided in the direction of arrow B, guided to the container communication path R, and returned to the container 10 through the container communication path R.
[0028]
In addition, in the illustrated example, a circumferential protrusion 28d is provided on the outer peripheral surface of the cylinder 28 between the outside air introduction hole 28a and the residual pressure release hole 28b, while the inner periphery of the cylinder housing part 27b of the pump body 27 is provided. Since the narrow groove 27a is formed on the surface in the reciprocating direction of the piston 30, the outside air can be passed through the narrow groove 27a, but the liquid is difficult to pass.
[0029]
As a result, the liquid that has flowed out of the cylinder 28 enters the cylinder 28 again through the outside air introduction hole 28a, flows back through the passage between the cylinder 28 and the plunger 32, and the cylinder 28, the plunger 32, the ejection cap 33, and the cover member. 35, the amount of liquid in the space S increases, and the liquid flows back through the outside air introduction path through the passage between the ejection cap 33 and the cover member 35 to the outside. Leakage can be prevented.
[0030]
When the hand is released from the trigger lever 36 after the ejection, the piston 30 and the plunger 32 are pushed back by the biasing force of the coil spring 29, the outlet 33a of the ejection cap 33 is closed by the valve portion 32a, and the trigger lever 36 is moved together with the ejection cap 33. return.
[0031]
Then, the pressure chamber P becomes negative pressure, the ball valve 26 is opened, the liquid in the container 10 is sucked up through the tube 25, put into the pressure chamber P through the liquid supply path in the pump body 27, and the inside of the pressure chamber P is 1 is filled with the liquid to be used in the ejection of, and the state shown in FIG. 1 is restored.
[0032]
In the state shown in FIG. 1, the communication between the atmosphere and the outside air introduction hole 28a is blocked by the seal portion 32c of the plunger 32 and the second seal portion 30b of the piston 30, and the communication between the pressure chamber P and the residual pressure release hole 28b. Is blocked by the first seal portion 30 c of the piston 30.
[0033]
【The invention's effect】
As described above, according to the present invention, the guide protrusion is provided on the outer peripheral surface of the cylinder so as to surround the residual pressure elimination hole and to block the outside air introduction hole and open toward the container communication path. When pushed to the final stage, the liquid leaking out of the cylinder from the cylinder through the residual pressure release hole due to the pressure in the pressure chamber is guided by the guide projection to the container communication path, and again inside the cylinder through the outside air introduction hole. It is possible to prevent the air from leaking outside through the outside air introduction path.
[0034]
According to the second aspect of the present invention, when the piston is pushed to the final stage, the liquid leaking from the pressure chamber through the residual pressure release hole is reliably guided toward the container communication path, and the leaked liquid is outside air. It is possible to reliably prevent going to the introduction hole.
[0035]
According to the third aspect of the present invention, since the circumferential protrusion is provided between the outside air introduction hole and the residual pressure elimination hole on the outer peripheral surface of the cylinder, the residual pressure is also eliminated by the circumferential projection. The liquid leaking out of the cylinder through the hole can be more reliably prevented from flowing back through the outside air introduction path and leaking outside.
[0036]
According to the fourth aspect of the present invention, since the ejection pump device according to the first, second, or third aspect is provided, an ejector including the ejection pump device having the above effects can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a jet pump device according to the present invention when not in use.
FIG. 2 is a partially enlarged view of a cylinder used in the ejection pump device.
FIG. 3 is a longitudinal sectional view of the jet pump device in use.
FIG. 4 is a longitudinal sectional view showing a state in which the trigger lever is fully rotated in the ejection pump device.
FIG. 5A is a longitudinal sectional view of a conventional ejection pump device in a non-use state, and FIG. 5B is a sectional view of a cylinder used in the conventional ejection pump device.
FIG. 6 is a longitudinal sectional view of the conventional jet pump device in use.
FIG. 7 is a longitudinal sectional view showing a state in which the trigger lever is fully rotated in the conventional jet pump device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Container 20 Jet pump apparatus 28 Cylinder 28a Outside air introduction hole 28b Residual pressure release hole 28d Circumferential protrusion 28e Guide protrusion 30 Piston P Pressure chamber R Container communication path

Claims (4)

An outside air introduction hole and a residual pressure release hole are provided through the inside and outside of the cylinder, and when the piston is pushed into the cylinder, the atmosphere communicates with the container communication path through the outside of the cylinder from the outside air introduction hole, and the piston In the ejection pump device that communicates the pressure chamber and the vessel communication path through the outside of the cylinder from the residual pressure elimination hole in the final pushing stage of
An ejection pump device, characterized in that a guide protrusion is provided on an outer peripheral surface of the cylinder so as to surround the residual pressure elimination hole and to block the space from the outside air introduction hole and to open toward the container communication path. The ejection pump device according to claim 1, wherein the guide protrusion is U-shaped. The jet pump device according to claim 1 or 2, wherein a circumferential protrusion is provided between the outside air introduction hole and the residual pressure release hole on the outer peripheral surface of the cylinder. An ejector comprising the ejection pump device according to claim 1, 2 or 3.

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