JPH0746789Y2 - Drain pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drain pump for continuously draining drain generated from an air conditioner or the like.

[Conventional technology]

Drains generated from air conditioners do not always occur steadily, and they also contain dust and the like. If you try to install a drainage pipe for discharging such drains in a place where there is no inconvenience in terms of structure or aesthetics such as a building, clogging of the drainage pipe is likely to occur because the drainage pipe has a difficult slope, etc. It was the cause of the failure.

Therefore, it was proposed to forcibly drain water using a drainage pump. In such a pump drainage method, in the method of operating the pump to drain when a predetermined amount of drain is accumulated,
Not only is it necessary to provide a somewhat large container to store the drain, but a control device for detecting the drain storage level and opening / closing the power supply of the pump is also required.
It is large and not economical. On the other hand, there is a method in which the pump is always operated and the drain is drained little by little as the drain flows in. It has been proposed (for example, Shokai 62-74187).

In such a drainage pump, for example, as shown in FIG. 3, the pump main body 1 is formed in a substantially conical shape, and the hole of the lid 4 of the pump main body 1 through which the shaft 3 of the runner 2 penetrates is made larger to form an air introducing slit. By forming 5,
When the drain generation amount is small, the introduced air amount is large, and when the drain generation amount is large, the introduced air amount is small, so that the drain can be continuously discharged. However, in such a pump, if the amount of generated drainage is too large, droplets may spray from the air introduction slit 5 and wet the motor 6, and in order to prevent this, the runner 2
It has been proposed to provide a draining disk 7 on the upper end of the shaft 3 of the above.

However, even with the pump having such an improvement, the problem that the drain in the discharge pipe flows back and overflows from the air introduction slit 5 when the operation is stopped is not solved, and the pump surrounding the pump is not solved. Draining of the drain was barely prevented by methods such as fencing.

[Problems to be solved by the device]

Conventional drainage pumps for drains were usually installed on the drain pan and generally operated at a low water level, but in some cases they may be operated at a high water level, and at It may be operated at a high flow rate. In such a case, the conventional technique cannot completely suppress the scattering of the drain, and further improvement has been desired.

Therefore, the present invention provides an improved drain pump that has sufficient capacity to drain drainage even if there is a large change in drainage generation, and that does not cause pollution of the surroundings due to splashing or overflowing of drainage. It is the one we are trying to provide.

[Means for Solving the Problems]

The purpose of the present invention as described above is to provide a pump body having a substantially inverted truncated cone shape with an axis vertical, in which a drainage pipe is connected to an upper side portion and an introduction port is formed in a bottom portion, and blades are provided vertically. In a pump provided with a runner, the runner has a passage opening from the inside of the drive shaft fitting hole to the outer surface of the runner toward the pump chamber. This can be achieved by a drain pump characterized in that it is formed of a hollow tubular body that constitutes a passage communicating with the inside.

The runner according to the present invention is provided with a passage opening from the inside of the fitting hole for inserting the tip of the drive shaft toward the outer surface of the runner toward the inside of the pump chamber. It may be on the outer surface of the shaft or on the side surface or the end surface of the blade, as long as it faces the space inside the body.

The runner drive shaft in the present invention may be a hollow tube whose both ends are open and is attached to the rotary shaft of the drive motor, or it may be used as the rotary shaft of the drive motor itself. Alternatively, a hollow tube may be used as a part of the rotating shaft. The hollow portion of the runner drive shaft is required to be open at the tip end inserted into the drive shaft fitting hole of the runner and also open to the outside of the pump at the other end. It is desirable that the opening to the outside is provided at a high position as far away from the pump body as possible.

The drain pump of the present invention is configured such that the air outside the pump can flow into the pump through the air passage formed in the runner drive shaft and the drive shaft fitting hole. However, a check valve structure for blocking the flow from the inside of the pump to the outside may be incorporated in the hollow portion of the runner drive shaft and the inside of the drive shaft fitting hole.

[Action]

In the drain pump of the present invention, when the pump is in operation, when the amount of generated drain is small, a large amount of air flows in through the runner drive shaft and the air passage in the drive shaft fitting hole, and the generated amount of drain, that is, the drain is sent out. The inflow of air decreases as the amount increases. However, the drain does not leak out through the air passage during operation, and the drain does not flow out from the open end of the air passage even when the pump operation is stopped and the drain in the discharge pipe flows backward.

〔Example〕

An example of the drain pump of the present invention is shown in FIG. In the figure, the same members as those in the conventional example are indicated by the same symbols.

This drain pump comprises a pump body 1 having a substantially inverted truncated cone-shaped pump chamber such that its axis line is vertical, and a drain introduction port 1a is provided at the lower end and drainage is provided at the upper side. A discharge port 1b for connecting a pipe is formed.

As shown in FIG. 2, the runner 2 is a disc portion 2a perpendicular to the axis.
A flat blade 2b is vertically installed on the lower surface side of the disk so as to include the axis, and a slit 2c is symmetrically provided on the disk portion 2a. The blade 2b has a substantially triangular shape according to the shape of the pump chamber. It is formed on. The shaft 3 of such a runner 2 is
It has a drive shaft fitting hole 3a for inserting a runner drive shaft 8 provided in the motor 6, and a lid 4 of the pump body 1.
It is attached so as to penetrate liquid-tightly. A passage 3b extending from the inside of the drive shaft fitting hole 3a to the outer surface of the shaft 3
Are formed so that the fluid can freely flow.

On the other hand, the runner drive shaft 8 is a hollow pipe, and a tip end thereof forms a pipe passage 8b that communicates with the inside of the drive shaft fitting hole 3a and the side opening 8a communicates with the outside. Therefore, the fluid in the drive shaft fitting hole 3a can freely flow with the outside of the pump through the conduit 8b.

When the drain pump of the present invention as described above is operated in a state in which it is installed in the drain pan, when the water level in the drain pan rises, the drain that enters the pump chamber from the inlet 1a of the pump is the blade of the runner. 2b is brought into contact therewith to be given a rotary motion, and is discharged from the discharge port 1b together with the air in the pump chamber. At this time, the pump chamber is replenished with air via the conduit 8b of the runner drive shaft 8, the inside of the drive shaft fitting hole 3a and the passage 3b, so that the drain is not sucked excessively. , Drainage is continued at a speed according to the water level in the drain pan.

Also, even if the drain of the drain remaining in the drain pipe flows back into the pump chamber due to the stop of the pump operation, there is no communication path to the outside except for these narrow and curved air passages, so the drain is the bottom of the pump chamber. Only returning to the drain pan from the inlet 1a of No. 1 does not cause spillage and spouting of droplets.

[Effect of device]

In the drain pump of the present invention, the air is introduced into the pump chamber from the outside through the air passage that penetrates the runner drive shaft and the drive shaft fitting hole, so that the continuous drain discharge according to the drain generation amount is performed. Not only is it possible to prevent this, but it is also possible to construct a drain discharge system that does not cause breakdowns or pollution by completely suppressing the scattering of drain that could not be suppressed by conventional technology. Is.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of the drain pump of the present invention, and FIG. 2 is a runner (a) of the drain pump of the present invention.
It is a side view, (b) sectional view, and (c) bottom view, and Drawing 3 is a sectional view of an example of a drainage pump by a prior art. 1 ... Pump body, 1a ... Drain introduction port, 1b ... Discharge port, 2 ...
Runner, 2b ... Blade, 3 ... Shaft, 3a ... Drive shaft fitting hole,
3b ... passage, 4 ... lid, 5 ... slit, 6 ... motor, 7 ... drain disc, 8 ... runner drive shaft, 8a ... opening, 8b ... conduit.

Claims (1)

[Scope of utility model registration request] 1. A pump main body having a substantially inverted truncated cone shape with an axis vertical, in which a drainage pipe is connected to a lateral upper part and an inlet is formed in a bottom part, and a runner having blades installed therein is provided. At, the runner has a passage opening from the inside of the drive shaft fitting hole toward the pump chamber toward the outer surface of the runner, and the inside of the runner drive shaft communicates the outside of the pump with the inside of the driving shaft fitting hole. A drain pump characterized in that it is formed of a hollow tubular body that constitutes a passage.