JPH1034039A - Liquid discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air and liquid from remaining in a pump chamber even when closing force on a discharge valve is large by providing a means for letting the pump chamber communicate with the outside when a piston gets to near the final position of a pressurizing process. SOLUTION: On the inner peripheral surface of a cylinder 12, a cylinder grooved part 74 is provided so that when an expanded diameter part 80 on the termination side of a piston 13 gets to near the final position of a pressurizing process, the expanded diameter part 80 gets to the middle part thereof. When the piston 13 gets to near the final position of the pressurizing process, a pump chamber P is communicated with the outside through the cylinder grooved part 74, a piston outer peripheral recessed part 81, and a cylinder communicative hole 75. Therefore, even when closing force on a discharge valve Y is large, air and liquid are prevented from remaining in the pump chamber P, and constant atomization is performed with sufficient discharge force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger type liquid ejector for ejecting an internal liquid into, for example, a mist or a foam by being mounted on a liquid container.

[0002]

2. Description of the Related Art A swinging motion of a trigger is converted into a reciprocating motion of a piston, a liquid in a liquid container (hereinafter, abbreviated as a container) is sucked from a hanging suction tube, and is discharged through a discharge valve. 2. Description of the Related Art A liquid ejector (hereinafter, abbreviated as an ejector) for ejecting a liquid from a nozzle is known (for example, Japanese Utility Model Publication No. 61-920).

In this type of ejector, a piston enters the cylinder to increase the internal pressure of the pump chamber to eject liquid, and then ejects the liquid from the cylinder to lower the internal pressure of the pump chamber to reduce the negative pressure. Thereby, the liquid in the container is sucked.

[0004] In this case, a sufficient discharge force is required particularly when the liquid inside is ejected in the form of a mist. For this reason, measures have been taken to increase the closing pressure of the discharge valve and increase the accumulated pressure. I have. That is, in this case, the liquid pressurized by the piston can be discharged by pushing the discharge valve only when the pressure becomes constant, so that a constant mist can be obtained.

[0005]

However, in the above case, when the closing force of the discharge valve is increased, when the piston reaches the vicinity of the final position of the pressurizing step, the volume of air remaining in the pump chamber at that time remains. Can not be pressurized until the discharge valve is pushed open against the closing force, and eventually the air is only elastically compressed and not exhausted, causing a problem that the air and liquid in the pump chamber cannot be completely replaced. Was.

Needless to say, the above-mentioned phenomenon is solved by weakening the closing force of the discharge valve. However, as described above, the accumulated pressure of the liquid is weakened, and the liquid is discharged at the beginning and end of discharge. There was a problem that the jet did not become a fog and stopped.

[0007]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of providing a liquid ejector which has solved the above-mentioned problems of the prior art, and pressurizes a pump chamber of a cylinder by moving a piston forward and backward. In the liquid ejector for ejecting the liquid sucked from the container through the discharge valve from the nozzle by decompression, a means for communicating the pump chamber with the outside when the piston reaches near the final position of the pressurizing step is provided. It is characterized by the following.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 5 to 7 are views showing the entire liquid ejector in which the present invention is implemented. Reference numeral 1 in the figure denotes an ejector main body, which is operated by a trigger type pump.
The liquid is sucked from a liquid container (not shown) via the suction tube 10 and is ejected from the nozzle 27.

A cylindrical leg 2 is hung down from below the ejector main body 1 and a screw cap 5 to be screwed into the opening neck of the liquid container is pulled out of a flange provided at the lower end of the leg 2. As a stopper, it is rotatably inserted into the leg 2 and a flange at the lower end of the leg 2 is sandwiched between the ceiling surface of the screw cap 5 and the upper surface of the opening neck of the liquid container. The inner cylinder 4 is inserted, and the flange 3 formed at the lower end of the inner cylinder 4 serves as a flange to be sandwiched.
The inner cylinder 4 has a configuration having a ceiling, and a pipe 44 projects from the ceiling. The suction tube 10 is inserted into the pipe 44 and functions as a liquid passage. The suction tube 10 is inserted into a communication tube 16 of a pump described later, and the small diameter portion 45 above the pipe 44 and the communication tube 1 are connected.
6 serves as a communication passage between the pump cylinder 12 and the ejection passage.

In the figure, reference numeral 12 denotes a cylinder of a pump P, in which a piston 13 reciprocates. In the drawing, reference numeral 30 denotes a trigger for driving the piston 13. One end of the trigger is a shaft support portion 31 for the ejector main body 1 so that the trigger can be swung about the center. This pivoting motion is converted into a reciprocating motion of the piston 13 (see FIGS. 6 and 7). Reference numeral 33 in the figure denotes a lever protruding from a position eccentric from the shaft support 31 of the trigger 30. Reference numeral 60 in the figure denotes a spring for constantly biasing the trigger 30 in the push-back direction in this case. In this embodiment, as the spring 60, a fixed spring type made of synthetic resin having an arm shape with high elasticity is adopted, and one end 61 is fixed to the liquid ejector main body 1 and bent. The other end 62 is arranged at a position where the lever 33 of the trigger 30 is pressed in the direction in which the trigger is pushed back.

With the above configuration, the trigger 30 is connected to the spring 60
The connected piston 13 enters the cylinder 12 by pulling it forward with the fingertip against the urging force of the finger (the state of FIG. 6), while the force of the spring 60 is reduced by weakening the force of the fingertip. The trigger 30 is pushed back, and the piston 13 retreats from the inside of the cylinder (the state of FIG. 7).

Next, reference numeral 16 in the figure denotes the cylinder 1 described above.
2 is a communicating cylinder for communicating an ejection passage 26 to be described later, and the communicating cylinder 16 and the cylinder 12 are communicated by the hole 15. The pipe 44 of the inner cylinder 4 inserted into the leg 2 is inserted into the communication cylinder 16, and this pipe 44
As described above, the space 17 between the small diameter portion 45 and the upper portion functions as a passage for the communication.

A suction valve X for sucking the liquid from the container and a discharge valve Y for discharging the sucked liquid to the ejection passage 26 communicating with the nozzle 27 are arranged in the communication cylinder portion 16. You.

The suction valve X is opened and closed by contact and separation between a valve seat of a valve hole 18 provided at the upper end of a pipe 44 into which the suction tube 10 is inserted and a ball valve 19.

On the other hand, the discharge valve Y opens and closes by the contact and separation of a valve 21 and a valve seat of a valve hole 20 provided in the communication cylinder portion 16. An insertion member 24 having a cross-shaped cross section is inserted into the ejection passage 26, and a compression spring 23 made of an elastic material is provided at one end of the insertion member 24. At the end of the support member 24, the valve 21 of the discharge valve Y is provided.
Is always urged to the valve seat of the valve hole 20 by the compression spring 23 and is closed. In this case, as described above, the urging force for closing the discharge valve Y is set to be relatively high in order to increase the accumulated pressure of the liquid pressurized by the piston and discharge good mist.

FIGS. 1 to 4 are drawings of the main part of an example of the means for communicating the pump chamber P, which is a characteristic part of the present invention, with the outside in the above-described ejector. In this embodiment, reference numeral 12 denotes a cylinder. In this embodiment, a cylinder is formed by inserting a sleeve 70 into an accommodation hole 71 provided in the ejector main body 1, and the inner peripheral surface of the sleeve 70 is used as the inner peripheral surface of the cylinder. With the face. The reason why the cylinder 12 is configured in this manner is that molding is performed for securing the space B in the cylinder 12. That is, the sleeve 70
By providing the sleeve outer peripheral concave portion 72 on the outer peripheral portion of the housing hole 71, an annular space B is formed between the sleeve outer peripheral concave portion 72 and the inner peripheral surface of the housing hole 71.

Next, reference numeral 13 in the figure denotes a piston.
In this embodiment, the piston outer peripheral concave portion 81 is formed in the remaining outer peripheral portion by forming an enlarged diameter portion 80 (here, a flare-shaped enlarged diameter portion) in which both ends are in sliding contact with the inner peripheral surface of the cylinder 12. ing.

In the cylinder 12 and the piston 13 described above, the means for communicating the pump chamber P with the outside when the piston reaches near the final position of the pressurizing step is realized by the following configuration.

First, a cylinder groove 74 is provided at a position on the inner peripheral surface of the cylinder 12 where the enlarged diameter portion 80 on the end side of the piston 13 reaches near the final position of the pressurizing step (the enlarged diameter portion reaches halfway) ( 2 and 3). When the enlarged diameter portion 80 on the terminal end side of the piston 13 reaches the vicinity of the final position of the pressurizing step, the cylinder groove 74 is provided with a space A formed between the piston outer peripheral concave portion 81 and the inner peripheral surface of the cylinder 12 and the pump. For communicating the room P,
As shown in FIG. 3, the opening of the groove needs to be located in the space A at the above position.

Next, communicating holes 73 and 75 are provided in the inner peripheral surface of the cylinder 12 so as to communicate with an annular space B formed between the outer peripheral concave portion 72 of the sleeve and the inner peripheral surface of the receiving hole 71. The communication hole 75 is provided in the downward direction of the ejector main body 1, that is, in the container direction, and is opened toward a space A formed between the piston outer peripheral concave portion 81 and the inner peripheral surface of the cylinder 12. It is necessary. And
The communication hole 75 communicates with the inside of the container via a communication hole 76 provided on the accommodation hole 71 side of the space A and a communication hole 77 provided on the ceiling of the inner cylinder 4. On the other hand, when the enlarged diameter portion 80 on the terminal end side of the piston 13 reaches the vicinity of the final position of the pressurizing step, the communication hole 73 is formed in an annular shape formed between the sleeve outer peripheral concave portion 72 and the inner peripheral surface of the housing hole 71. This space B communicates with the outside air, and needs to be provided at a position not covered by the outer periphery of the piston 13 at this position (see FIG. 1).

The operation of the ejector of the present invention having the above configuration is as follows. When the piston 13 reaches near the final position of the pressurizing process,
The pump chamber P is communicated with the inside of the container and the outside air through the following two communication paths. One is a communication path communicating with the inside of the container via the cylinder groove 74, the space A, the communication hole 75, the space B, the communication hole 76, the communication hole 77, and the other is a cylinder groove 74, the space A, the communication hole 75, This is a communication path that communicates with the outside air via the space B and the communication hole 73.

As a result, since the residual air in the pump chamber P is immediately discharged, the air and the liquid in the pump chamber P are completely replaced. Then, the pressure reduction of the pump chamber P due to the communication is performed when the discharge valve Y is temporarily opened (in this case, the closing is performed if the closing force is sufficiently increased, but in a halfway state otherwise). (It can be assumed that it is open.) Means that it is immediately closed by the urging force, and in such a case, jetting from the nozzle and dripping at the end of spraying are prevented. It will be.

On the other hand, the liquid remaining in the pump chamber P together with air remains in the lower part of the space A through the cylinder groove 74 and further in the lower part of the space B through the communication hole 75.
However, when the piston 13 shifts from the final position to the suction step, the liquid in the container is sucked into the pump chamber P, and the pressure in the container is reduced by that much. It is sucked into the container through the communication hole 77 and does not leak out from the communication hole 73 through the annular space B. For the above reason, it is desirable that the communication hole 73 is provided above the communication holes 75, 76, and 77, that is, in the direction opposite to the container.

[0024]

According to the present invention having the above configuration,
Even if the closing force of the discharge valve is increased, air or liquid does not remain in the pump chamber, so that a constant spray can be performed with a sufficient discharge force, and the liquid does not become mist at the beginning and end of discharge, and jets Thus, a liquid ejector that does not stop or droop on the object is realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a liquid ejector according to the present invention.

FIG. 2 is an enlarged sectional view of a part of the above.

FIG. 3 is an enlarged cross-sectional view of part of the above.

FIG. 4 is a sectional view of a main part of the liquid ejector of the present invention.

FIG. 5 is a partially cutaway side view of the liquid ejector of the present invention in a state where a trigger is pushed back.

FIG. 6 is a partially cut-away side view showing a state where a trigger is pulled;

FIG. 7 is a sectional view showing a state in which the trigger is pushed back;

[Explanation of symbols]

 P Pump chamber 12 Cylinder 13 Piston 74 Cylinder groove part 75 Cylinder communication hole 80 Large diameter part 81 Piston outer peripheral concave part

Claims (2)

[Claims] 1. A liquid ejector for ejecting a liquid sucked from a container through a discharge valve from a nozzle by pressurizing and depressurizing a pump chamber of a cylinder due to advance and retreat of a piston. A liquid ejector characterized in that there is provided a means for communicating the pump chamber (P) with the outside when the pump chamber reaches a position near the final position. 2. A piston outer peripheral concave portion (81) is formed in the remaining outer peripheral portion by forming both ends of a piston (13) as enlarged diameter portions (80) that are in sliding contact with the inner peripheral surface of the cylinder (12). In (12), the outer peripheral concave portion (8
Cylinder communication hole (7) with the outside opened to 1)
5), while the enlarged diameter portion (80) is located on the inner peripheral surface of the cylinder (12) where the enlarged diameter portion (80) near the end of the piston (13) reaches near the final position of the pressurizing step.
Is provided with a cylinder groove (74) reaching the middle thereof, and when the piston (13) reaches the vicinity of the final position of the pressurizing step, the pump chamber (P) becomes the cylinder groove (74), the piston outer peripheral concave portion (81), The liquid ejector according to claim 1, wherein the liquid ejector is configured to communicate with the outside via a cylinder communication hole (75).