JPH0596484U - Drainage pump runner - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a small drainage pump that has a drainage capacity that can respond to large fluctuations in the amount of inflow water while always operating continuously, and that not only does not cause clogging but also has low drainage noise. To do. [Structure] A flat plate-shaped blade including the axis is vertically provided on the lower surface side of a disk portion orthogonal to the axis line, and each of the semicircular portions of the disk portion divided by the flat plate-shaped blade is A drain pump runner is characterized in that slits connecting the upper and lower sides are provided symmetrically from the vicinity of the axis to the outer peripheral edge and the lower side of the trailing edge of the slit is obliquely cut off. It is vertically installed in a drainage pump having a substantially inverted conical pump case provided with a passage.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drainage pump, and more particularly to a pump suitable for continuously discharging drainage generated from air conditioners and the like.

[0002]

[Prior Art]

 Drain generated from air conditioners does not always occur steadily, and it also contains dust. If it is attempted to provide a drainage pipe for draining such a drain in a place where there is no inconvenience in terms of structure or aesthetics of the building, etc., the drainage pipe will not be steep, and dust will be prone to clogging. , Was causing a failure.

Therefore, it has been proposed to forcibly drain the drain with a drain pump. There is also a method of draining the pump by operating the pump when a certain amount of drain is accumulated in the drainage system, but a container for storing the drain is provided and a switch for detecting the drain storage level and opening / closing the power source of the pump is provided. It has to be large, and it is large and not economical.

On the other hand, there is a method of constantly operating the pump and discharging the drain whenever it flows in. A compact drainage pump suitable for discharging the drain that contains dust and the like and whose flow rate varies a lot. Have been proposed (Japanese Utility Model Laid-Open No. 59-154897, Japanese Patent Laid-Open No. 61-104191, etc.). However, such a small-sized drainage pump has a drawback that a large amount of noise is generated every time drainage flows in and drainage starts.

[0005]

[Problems to be solved by the device]

 Under the circumstances as described above, the present invention has a drainage capacity capable of responding to a large fluctuation of the inflow water amount while continuously operating continuously, and not only does not cause dust clogging but also particularly low drainage noise. It aims to provide a small drainage pump.

[0006]

[Means for Solving the Problems]

 As described above, the object of the present invention is such that a flat blade including the axis is vertically provided on the lower surface side of the disk portion orthogonal to the axis, and the semicircular portion of the disk portion divided by the flat blade is formed. Each of the drainage pump runners is characterized in that a slit connecting the upper and lower sides of the disk portion is provided axially symmetrically from the vicinity of the axis to the outer peripheral edge, and the lower side of the trailing edge of the slit is cut off obliquely. It is achieved by vertically arranging it in a drainage pump having a substantially conical pump case with a ventilation path provided on the upper surface with the axis being vertical.

The flat blades of the pump runner according to the present invention preferably have a substantially triangular shape according to the shape of the pump case, and dust clogging occurs between the edges of the blades and the inner surface of the pump case. It is preferable that an appropriate gap be maintained so as to prevent

The slits provided symmetrically on the disk portion of the runner are for equalizing the pressure on the upper side and the lower side of the disk portion, and a machine for pushing out dust around the shaft to the outer peripheral edge. It also has the ability. Therefore, the shape of the slit may be radially provided toward the outer circumference, but it is more preferable that the slit is formed so as to recede toward the outer side with respect to the rotation direction of the runner.

[0009]

[Action]

 The drainage pump of the present invention having such a specially shaped runner can suppress the drainage noise generated when the drain intermittently flows in to an extremely low level.

[0010]

【Example】

 An embodiment of the drainage pump of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a pump case, the inner surface of which is formed in a substantially conical shape, and the axis of which is vertical. A lower end thereof forms a narrowed intake port 1a, and a discharge port 1b is provided on the upper side. Reference numeral 2 is a runner, the shaft 2a of which is fitted to the rotating shaft 4a of the motor 4.

Reference numeral 3 denotes a lid, which is attached to the opening of the upper surface of the pump case 1 by a screw 6 or the like, and the motor 4 is fixed above it. The lid 3 is provided with a hole 3a through which the shaft 2a can be loosely penetrated, so that air can be freely sucked. Further, 5 is a draining plate.

The runner 2 is provided with a disc portion 2b perpendicular to the shaft 2a, and further, a flat blade 2c is provided below the disc portion 2b so as to include the axis. The blade 2c has a thin, generally triangular shape at the lower end, and divides the disc portion 2b into two semicircular portions. Slits 2d are provided symmetrically to each other in each of these semicircular portions, so that the upper side and the lower side of the disc portion 2b are connected to each other. When the runner 2 is set to rotate clockwise when the runner 2 is viewed from the lower side (see FIG. 2 (c)), the shape of the slit 2d is from the through hole portion 2e near the axis. It is formed so that it gradually recedes counterclockwise to the outer peripheral edge.

The drainage pump of the present invention provided with the runner having such a shape is installed so that its suction port 1a is located in the drain pan, and while the runner 2 is rotated, water is gradually supplied into the drain pan. Go on. When water comes into contact with the tip of the rotating blade 2c, centrifugal force acts on the water. When the water level in the pump case 1 rises, the water is sent to the discharge port 1b by centrifugal force, and at the same time, the air in the pump case 1 is also discharged along with the water. Air flows into the pump case 1 through the hole 3a, and a balanced air flow is generated on the upper and lower sides of the disk portion 2b of the runner 2 through the slit 2d including the through hole portion 2e. Is discharged smoothly regardless of its flow rate, and no loud noise is generated.

The following is an example of measurement results of drainage noise of the drainage pump of the present invention. Install the drainage pump A shown in Fig. 1 equipped with a disk runner with a diameter of 31 mm so that the distance between the bottom of the drain pan and the inlet is 5 mm, and the drainage pipe connected to the outlet has a lifting height of 500 mm Was installed. While the pump was operating, the amount of water supplied to the drain pan was changed and the noise level was measured 1 m directly above the pump. The result is shown as a graph (A) in FIG.

Further, the runner is of a triangular plate blade type having no disk portion as shown in FIG. 3 (the same shape as that disclosed in Japanese Utility Model Laid-Open No. 59-154897, the maximum width is 31 mm) B The result of the same measurement as above was shown in the graph (B) of FIG. Further, a drainage pump C having the shape shown in FIG. 4 and the pump case having the shape shown in FIG. 5 is assembled (same as the one disclosed in JP-A-61-1104191). The same measurement was performed for the shape and the diameter of the disk portion of the runner 31 mm). The result is shown as a graph (C) in FIG.

From these results, it can be seen that the drainage pump of the present invention is remarkably improved in noise level.

[0017]

[Effect of the device]

 The drainage pump according to the present invention is configured with a pump case of a specific shape and a runner of a specific shape, has a drainage capacity capable of responding to a large change in the inflow water amount, and produces noise even during constant operation. It does not become. Moreover, because it is small and has a large capacity, there are few restrictions on the installation location, and therefore it is possible to further increase the degree of freedom regarding the installation location of air conditioning equipment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of a drainage pump equipped with a drainage pump runner according to the present invention.

FIG. 2 is a side view (a), a sectional view (b) and a bottom view (c) of a drainage pump runner according to the present invention.

FIG. 3 is a side view (a) and a sectional view of an example of a prior art runner.
(b) and bottom view (c).

FIG. 4 is a side view (a), sectional view (b) and bottom view (c) of another example of a prior art runner.

5 is a cross-sectional view of a case of a conventional drainage pump equipped with the runner of FIG.

FIG. 6 is a graph showing a result of measuring a relationship between a drainage amount of a drainage pump and generated noise.

[Explanation of symbols]

 1 Pump case 2 Runner 2a Shaft 2b Disk part 2c Blade 2d Slit 3 Lid 4 Motor 5 Drain plate.

Claims (1)

[Scope of utility model registration request] 1. A runner vertically installed in a drainage pump having a substantially conical pump case in which a ventilation path is provided on an upper surface with an axis line being vertical, and a flat plate shape is provided on a lower surface side of a disc portion orthogonal to the axis line. The blades are vertically installed including the axis, and the semicircular portions of the disc portion divided by the flat blades are provided with slits that connect the upper and lower sides of the disc portion to each other from the vicinity of the axis to the outer peripheral edge of the disc. The runner for a drainage pump, characterized in that the lower side of the rear edge of the slit is cut off obliquely.