JPH0737732Y2 - Pump for ejector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention can be applied to a sprayer or a sprayer for spraying the contents such as liquid and emulsion contained in a container from a spray outlet into a small amount. Specifically, it relates to a pump that is attached to a container in such a sprayer or the like, sucks up the content in the container, and ejects the content from the ejection port.

2. Description of the Related Art Conventionally, in this type of pump, for example, as shown in FIG. 4, a jet passage 2 communicating with a jet outlet 1 and a lateral hole 3 communicating with the jet passage 2 are formed in a piston 4, and the piston 4 is removed from the outside. It is biased in the direction and stored in the cylinder 5 so that it can reciprocate freely.
When the piston 4 is pushed in, the seal valve is in a first position where the ejection passage 2 communicates with the inside of the cylinder 5 through the lateral hole 3, and when the piston 4 returns, the seal valve is in a second position where the communication is cut off. A piston 6 is slidably provided between the piston 4 and the cylinder 5 with a seal therebetween. Then, such a pump is attached to the inlet of the container 7, and when the piston 4 is pushed in, by pressurizing the content in the cylinder 5, the content is pressure-fed to the ejection passage 2 through the lateral hole 3, and from the ejection port 1. While ejecting, the contents in the container 7 were sucked up into the cylinder 5 when the piston 4 returned.

However, in the conventional configuration, there is a problem that the contents remaining in the ejection port 1 hang down from the ejection port 1 and contaminate the container 7 and its surroundings after use of the ejection device. there were.

Therefore, an object of the present invention is to prevent the residue at the ejection port portion from dropping from the ejection port after the use of the ejection device and to prevent the container and its surroundings from being contaminated.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention according to claim 1 forms a jet passage inside which communicates with a jet outlet and a lateral hole which communicates with the outer periphery of the piston, and the piston When the piston is pushed in, it is in the first position communicating the ejection passage with the inside of the cylinder through the lateral hole, and when the piston is returned, A seal valve at a second position for shutting off the communication is provided between the piston and the cylinder so as to seal between them and slidably provided, and is attached to the inlet of the container, In a pump for an ejector or the like that sucks up contents and ejects the contents from the ejection port, when the piston returns, the seal valve moves from the first position to the second position, so that the piston and the seal valve It is characterized in that the space generated between the above and the jetting passage are communicated with each other through a communicating passage.

Further, the present invention according to claim 2 is the same pump for ejector or the like, and when the piston returns, the seal valve moves from the first position to the second position, so that the piston and the It is characterized in that a space generated between the seal valve and the ejection passage communicates with the ejection passage.

Action When the piston is pushed in, the contents in the cylinder are pressure-fed to the ejection passage through the lateral hole and ejected from the ejection port.
On the other hand, when the piston returns, the lateral hole is closed and the contents in the container are sucked up into the cylinder. At this time, a part of the content remaining in the ejection port from the ejection passage is accommodated in the space formed between the piston and the seal valve through the communication passage or the lateral hole.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic structure of an ejector pump according to the first aspect of the present invention. Reference numeral 10 in the figure denotes a cylinder. The cylinder 10 has an elongated cylindrical shape, an outward flange 10a is integrally provided on the upper end, and one end of the suction pipe 11 is connected to the lower end. A valve chamber 12 is formed in the cylinder 10. In the valve chamber 12, a ball valve (check valve) 13 is arranged on the valve seat 10b, and the spring
14 is accommodated and one end thereof is pressed against the step portion 10c of the cylinder 10. The other end of the spring 14 is pressed against the piston lower portion 17 of the piston 16. The lower piston 17 is the upper piston 18
To form piston 16 which is
Has a jet passage 16a at the center. Lower part of the piston 17
Is integrally provided with a hollow shaft portion 17a and an enlarged portion 17b at the lower end thereof. The enlarged portion 17b is provided with a step portion 17c, and the shaft portion 17a is provided with a step portion 1c.
A lateral hole 17e is provided immediately above 7c so as to penetrate therethrough in the radial direction. On the other hand, the piston upper part 18 has a hollow shaft-like shape, and a diameter-expanded part 18a
To provide. A space 21 is provided in the expanded diameter portion 18a. The space 21 is annular and opens downward. A seal valve 19 is attached to the shaft portion 17a of the piston lower portion 17 of the piston 16, and the seal valve 19 seals between the piston 16 and the cylinder 10. The seal valve 19 is made of, for example, a rubber material and is formed in a short tubular shape having an H-shaped cross section. Seal part outside the seal valve 19
19a and 19b are pressed against the inner surface of the cylinder 10 so as to be slidable, and one seal portion 19a is butted against the bush 20 fitted to the flange 10a side of the cylinder 10. The inner seal portion 19c abuts the step portion 17c of the piston lower portion 17 to close the lateral hole 17e, and shuts off the communication between the valve chamber 12 and the ejection passage 16a. The other inner seal portion 19d is provided so as to be able to move in and out of the space 21 by being pressed against the inner surface of the expanded diameter portion 18a.
A jet button 24 is attached to the upper end of the piston upper portion 18.
The ejection port 24a of the ejection button 24 communicates with the ejection passage 16a of the piston 16.

By the way, according to the present invention as set forth in claim 1, a communication passage 26 is provided in the lower portion 17 of the piston so as to penetrate therethrough in the radial direction.
And the ejection passage 16a. Further, a communication passage 27 is provided between the seal valve 19 and the shaft portion 17a of the piston lower portion 17,
The space 21 and the ejection passage 16a communicate with each other through the lateral hole 17e.

Now, the pump described above is housed in the container 28 and its inlet
Attach to 28a via cap 29. In the container 28,
For example, cosmetics such as emulsion are stored.

Then, the piston 16 is spring 14 through the ejection button 24.
When the piston 16 is pushed in against, the inner seal portion 19d slides into the space 21 as shown in FIG. 2 and slides against the piston upper portion 18, and at the same time the inner seal portion 19c projects. Open the side hole 17e away from the section 17c. As a result, the seal valve 19 is in the first position where the ejection passage 16a and the valve chamber 12 communicate with each other through the lateral hole 17e. Then
When the piston 16 is pushed in together with the seal valve 19, the content in the valve chamber 12 is pressurized and pressure-fed to the ejection passage 16a through the lateral hole 17e and ejected from the ejection port 24a of the ejection button 24.

After ejection, when the pushing force of the piston 16 is released, the spring 14 pushes up the piston 16. When the piston 16 is returned, first, the step portion 17c hits the seal portion 19c of the seal valve 19 to close the lateral hole 17e. And the seal valve 19 is the second
At the position, the communication between the ejection passage 16a and the valve chamber 12 is blocked, and ejection from the ejection port 24a is stopped. At the same time, piston 1
With the upward movement of 6, the seal portion 19d of the seal valve 19 comes out of the space 21 to form the space 21. The seal portion 19d is the expanded diameter portion 1
Since it is pressed against the inner surface of 8a, the upward movement of the piston 16 causes a negative pressure in the ejection passage 16a via the communication passages 26 and 27, and a part of the content remaining in the ejection outlet 24a is communicated from the ejection passage 16a. It is sucked into the space 21 through the passages 26 and 27 and accommodated. As a result, the residue of the spout 24a is pulled into the back of the mouth,
Prevents dripping from the spout 24a. Next, the piston 16 is pushed up together with the seal valve 19 so that the inside of the valve chamber 12 is negatively pressured, the ball valve 13 is opened, and the contents in the container 28 are sucked into the valve chamber 12 through the suction pipe 11.

In addition, in the above-described embodiment, the two communication passages 26 and 27 are provided. However, in this invention, the communication passages 26 or 27 may be connected to each other.

Next, the invention according to claim 2 is constructed as shown in FIG. That is, in the embodiment of the invention described in claim 1 above, the communication passages 26 and 27 are provided separately from the lateral hole 17e, but in the present invention, the lateral passage 17e constitutes the communication passage as shown in the drawing. Thus, in the pump similar to that described above, when the piston 16 returns, the content remaining in the ejection port 24a from the ejection passage 16a is sucked into the space 21 through the lateral hole 17e and stored.

Effect of the Invention From the above, according to the pump for an ejector and the like according to the present invention, when the piston is returned, a part of the contents remaining in the ejection port from the ejection passage is generated between the piston and the seal valve. In the device according to claim 1, the device is accommodated through the communication passage, and in the device according to claim 2, is accommodated through the lateral hole. The residue can be prevented from dripping from the outlet, and as a result, the container and its surroundings can be prevented from being soiled.

[Brief description of drawings]

FIG. 1 is a sectional view of a pump for ejector according to the present invention described in claim 1, FIG. 2 is a sectional view when the piston is pushed in, and FIG. 3 is for ejector according to the present invention described in claim 2. FIG. 4 is a sectional view of a pump, and FIG. 4 is a sectional view of a conventional pump for ejector. 10 …… Cylinder 12 …… Valve chamber 16 …… Piston 16a …… Spout passage 17e …… Side hole 19 …… Seal valve 24 …… Spout button 24a …… Spout 26/27 …… Communication passage

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A piston is formed with an internal ejection passage communicating with the ejection outlet and a lateral hole communicating with the outer periphery of the piston, and the piston is biased outwardly and reciprocally housed in the cylinder.
When the piston is pushed in, a seal valve which becomes a first position communicating the ejection passage and the inside of the cylinder through the lateral hole and a second position which interrupts the communication when the piston returns is provided with the piston. In a pump for an ejector or the like configured to be slidably provided between the cylinder and the cylinder so as to be slidable, to be attached to an inlet of a container, to suck up the content in the container and eject the content from the ejection port. When the piston is returned, the seal valve moves from the first position to the second position, so that the space generated between the piston and the seal valve communicates with the ejection passage through the communication passage. A pump for ejectors, etc. 2. An internal ejection passage communicating with an ejection port and a lateral hole communicating with the outer periphery of the piston are formed in a piston, and the piston is urged outward to be reciprocally housed in a cylinder.
When the piston is pushed in, a seal valve which becomes a first position communicating the ejection passage and the inside of the cylinder through the lateral hole and a second position which interrupts the communication when the piston returns is provided with the piston. In a pump for an ejector or the like configured to be slidably provided between the cylinder and the cylinder so as to be slidable, to be attached to an inlet of a container, to suck up the content in the container and eject the content from the ejection port. When the piston returns, the seal valve moves from the first position to the second position, so that the space formed between the piston and the seal valve communicates with the ejection passage through the lateral hole. A pump for ejectors, etc.