JPS6363753B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a portable air pump.

[Prior art]

An air suction port and an air discharge port are provided at one end of a pump body made of bellows, and check valves having opposite directions are interposed in these suction ports and air discharge ports, respectively, so that the pump body is repeatedly expanded and contracted. Air pumps that increase the internal pressure of an air tank, liquid tank, etc. connected to a discharge port have been conventionally known.

[Problem that the invention seeks to solve]

According to the air pump described above, the air in the pump body is compressed and air starts to be discharged from the discharge port, and the check valve at the discharge port is opened until the discharge ends. The internal pressure will be equal to the pressure on the tank side. Since the pump body is composed of bellows, the volume of its internal space does not become zero even when compressed to the maximum, so pressurized air remains inside. As mentioned above, the pressure of that air is equal to the pressure inside the tank, so when the internal volume of the pump body is expanded next, the problem is that the pressure will not drop to the level required to open the check valve unless the amount of expansion becomes considerably large. There is.

[Means for solving problems]

In order to solve the above problems, this invention encloses a gel-like amorphous substance (hereinafter simply referred to as amorphous substance) inside the pump body, and the volume of the amorphous substance is calculated from the internal volume of the pump body. The size is approximately equal to the remaining volume after subtracting the maximum discharge amount.

[Effect]

With the above configuration, when the pump body is compressed, the inside is mostly occupied by amorphous materials,
Moreover, the volume of the amorphous material does not change due to an increase in internal pressure. Therefore, since almost no air remains when the pump body is compressed to the maximum, the check valve on the absorption side opens immediately when the pump body is expanded next time.

〔Example〕

The accompanying drawings show an example in which a bellows type air pump 1 according to the present invention is used in a sprayer 2.

The sprayer 2 is equipped with a jet pipe 4 at the bottom of a tank 3, and a handle 5 for operating the air pump 1.
and a crank lever 6 connected to the handle 5.

In the air pump 1, the lower end of the bellows 7 is inserted into a cup member 8 and fixed thereto, and the crank lever 6 is rotatably inserted into the bottom of the cup member 8 (see FIG. 4). In the case of FIG. 5, the crank lever 6 is pivotally attached to the side surface of the cup member 8.

The upper end of the bellows 7 is fixed to a bracket 9 fixed to the sprayer 2, and the bracket 9 is provided with an air inlet 10 and an air outlet 11. The air suction port 10 is provided with a check valve 13 that is biased outwardly by a spring 12, and in a normal state, the air suction port 10 is
The valve hole 14 is closed, and atmospheric air is sucked in through the suction pipe 15 when the internal pressure drops below a certain level. Also, a check valve 1 is provided at the air discharge port 11 and is biased by a spring 16 in a direction opposite to that in the above case.
7 is provided, which closes the valve hole 18 of the discharge port 11 under normal conditions, and sends air into the tank 3 through the discharge pipe 19 when the internal pressure rises above a certain level.

Furthermore, an amorphous material 20 made of a polymer is sealed inside the bellows 7 described above.

The volume of this amorphous material 20 is approximately equal to the remaining volume obtained by subtracting the maximum discharge amount from the volume of the bellows 7.

That is, the maximum discharge amount of the bellows 7 is the amount of air discharged while the cup member 8 moves from its lowest position until it hits the bracket 9 (see FIG. 3). Therefore, in the examples,
An amorphous object 20 is enclosed from the bottom of the bellows 7 to the height of the cup member 8.

Now, when bellows 7 is extended as shown in Figure 2,
Check valve 1 of suction port 7 because its internal pressure decreases.
3 opens the valve hole 14 and sucks air. Next, when the cup member 8 is raised by operating the handle 5 to increase the internal pressure, the check valve 17 of the discharge port 11 opens the valve hole 18, and air is sucked into the tank 3. (See Figure 3).

In this manner, when the cup member 8 is pushed up to the highest position and its upper end touches the bracket 9, almost all of the air inside the bellows 7 is discharged.

Then, when the cup member 8 is lowered by operating the handle 5, the internal pressure of the bellows 7 rapidly decreases below a certain level, so the check valve 13 of the suction port 10 immediately opens its valve hole 14. and inhale air.

Thereafter, the internal pressure of the tank 3 is increased by repeating the same operation.

〔effect〕

Since this invention has a configuration in which a predetermined amount of amorphous material is sealed inside the pump body made of bellows as described above, there is no change in the volume of the amorphous material during compression. Therefore, almost no pressurized air remains inside the pump body during compression.

Therefore, since the check valve on the suction side opens its valve hole immediately when the pump main body is extended, a highly efficient pump can be obtained. In addition, in portable pumps, the pump itself is sometimes used in an inclined state, but in the case of this invention, since an amorphous material (gel-like material) is used, changes in the inclination of the surface are It is slow. Therefore, there is no problem with the pump's operation even when it is used in an inclined position.
The desired effect can be achieved.

[Brief explanation of drawings]

Fig. 1 is a partially omitted sectional view of the embodiment; Figs. 2 and 3 are enlarged sectional views of the same air pump portion; Fig. 4 is a side view showing the crank lever and cup member; Fig. 5. 4 is a side view showing a modification of FIG. 4. FIG. 1... Air pump, 2... Sprayer, 7... Bellows, 8... Cup member, 9... Bracket,
10... Suction port, 11... Discharge port, 13... Check valve, 14... Valve hole, 17... Check valve, 18... Valve hole.

Claims (1)

[Claims] 1. In an air pump in which an air intake port and an air discharge port are provided at one end of the pump body made of bellows, and directional check valves are inserted in each of these intake ports and air discharge ports, a gel-like substance is installed inside the pump body. 1. A portable air pump characterized by enclosing a fixed-shaped material and forming the volume of the amorphous material to be approximately equal to the remaining volume after subtracting the maximum discharge amount from the internal volume of the pump body.