JPH0338476Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small and long-life liquid discharge pump for discharging drain water etc. from an air conditioner.

Conventionally, this type of pump is as shown in Utility Application No. 58-49872, and its outline will be explained with reference to FIG. The air enters the pump from the gas inlet 8, the drain forms a paraboloid of revolution caused by the rotational movement around the drive shaft 4, and the drain is sucked up from the suction port 5.
It is discharged from the discharge port 6. However, by increasing the drain speed, it rises inside the pump body 3. During this time, a free surface in the shape of a paraboloid of revolution is formed on the drain, which balances with the atmosphere flowing in from the gas inlet near the drive shaft, so that when the drain reaches the top of the pump, the velocity component obtained by the rotation is discharged from the discharge port 6. In other words, regardless of the amount of air remaining in the pump, if the drain contacts the tip of the blade, centrifugal force is applied to the drain due to the rotation of the blade, and air enters from the gas inlet, creating a free surface inside the pump. It has a so-called self-sufficient effect in that it can be formed and discharged, and has characteristics that are extremely suitable as, for example, a drain discharge pump for an air conditioner.

When the pump stops now, the drain moves inside the pump body 3 along the curved surface 9 from the discharge port 6 toward the suction port 5, and all the dust in the drain falls without accumulating inside the pump body 3. Therefore, the next time of starting, the rotating blade 2 can be started without being bitten.

However, although conventional pumps are able to restart stably without drain buildup inside the pump body, as is clear from the drawing, the suction port 5
There is a relationship B>A between the diameter A of the discharge port 6 and the diameter B of the discharge port 6. In such a state, as shown in FIG. A large amount of air 11 is drawn into the pump (as shown in Figure 1), and this air collides with the inner wall of the pump body, causing noise.

This proposal was devised in view of the above points, and according to this proposal, the inner surface is a curved surface that gradually increases in diameter,
The pump body has a suction port on the small diameter side of this curved surface and a discharge port on the large diameter side, and a vane that rotates by a drive shaft from above inside the pump body at a distance that does not touch this curved surface. A gas inflow part is provided near the drive shaft of the vane to allow atmospheric air to flow in, and the rotational movement of the liquid around the drive shaft forms a free surface within the pump body where the equal pressure surface can be approximated by a paraboloid of revolution. The rotary vane rotating inside has an air layer, that is, a space capable of forming a free surface, and this space is communicated with the gas inlet, and the diameter of the discharge port is made smaller than the diameter of the suction port. Our goal is to provide a compact and long-life liquid discharge pump that has a relatively high lifting head of 0.5m to 3m and is used for pumping up sewage mixed with mud, cotton dust, etc. It is something to do.

Below, the same parts as in Figure 1 are indicated by the same symbols in Figure 3.
One embodiment shown in the figure will be explained.
Since it is exactly the same as the figure, detailed explanation thereof will be omitted.

However, the difference between the liquid discharge pumps in FIG. 3 and FIG. 1 is that in FIG. 1, as mentioned above, there is A< In contrast, in the case shown in FIG. 3, the relationship C>D is established between the diameter C of the suction port and the diameter D of the discharge port.

That is, by doing this, the drain flow 10 (shown in a grid pattern) pumped up from the suction port 5 flows to fill the discharge port 6 as shown in FIG. A small amount of the air 11 flowing into the main body 3 is drawn into the drain, resulting in a state as shown in FIG. 4.

In other words, the amount of air that flows out from the discharge port along with the drain during drainage, which is the fate of this type of pump, is reduced.

Therefore, the air 11 is mixed into the drain and discharged from the discharge port 6.
Since the amount flowing out is smaller, it is less likely to collide with the inner wall of the pump body, and noise will be reduced.

However, when using a pump for liquid discharge, when the pump stops operating, the drain containing dust flows out from between the rotary vane and the inner wall of the pump body, so the next startup can be performed stably, and the above-mentioned In addition to its self-sufficiency feature, it is ideal as a drain discharge pump for air conditioners, etc.

In addition, in Fig. 1, it is possible to partially throttle the discharge port 6 and make the inner diameter of this constricted part smaller than the diameter of the suction port, or to throttle a part of the piping connected to the discharge port to make it smaller than the diameter of the discharge port. The effect remains the same.

[Brief explanation of drawings]

Figure 1 is a schematic partial cross-sectional view of a conventional liquid discharge pump, Figure 2 is a partial cross-sectional view showing the drain flow of a conventional liquid discharge pump, and Figure 3 is a schematic partial cross-sectional view of a conventional liquid discharge pump. FIG. 4 is a partial sectional view showing the flow of the drain of the pump for discharging liquid according to the present invention. 2...Rotating vane, 3...Pump body, 5...Suction port, 6...Discharge port, 8...Gas inlet, 9...
curved surface.

Claims (1)

[Scope of utility model registration request] The inner surface is a curved surface that gradually increases in diameter, and the pump body has a suction port on the small diameter side and a discharge port on the large diameter side of this curved surface, and a It has a vane that rotates on the drive shaft, and a gas inflow part is provided near the drive shaft of the vane to allow atmospheric air to flow in, so that the rotary movement of the liquid around the drive shaft causes an isobaric surface to rotate and release inside the pump body. The rotary vanes that rotate within the pump have an air layer, that is, a void that can form a free surface, and this void is communicated with the gas inlet, and the diameter of the discharge port is A liquid discharge pump characterized in that the diameter of the suction port is smaller than the diameter of the suction port.